| /* |
| * apply.c |
| * |
| * Copyright (C) Linus Torvalds, 2005 |
| * |
| * This applies patches on top of some (arbitrary) version of the SCM. |
| * |
| */ |
| |
| #include "git-compat-util.h" |
| #include "abspath.h" |
| #include "base85.h" |
| #include "config.h" |
| #include "object-store-ll.h" |
| #include "delta.h" |
| #include "diff.h" |
| #include "dir.h" |
| #include "environment.h" |
| #include "gettext.h" |
| #include "hex.h" |
| #include "xdiff-interface.h" |
| #include "merge-ll.h" |
| #include "lockfile.h" |
| #include "name-hash.h" |
| #include "object-name.h" |
| #include "object-file.h" |
| #include "parse-options.h" |
| #include "path.h" |
| #include "quote.h" |
| #include "read-cache.h" |
| #include "rerere.h" |
| #include "apply.h" |
| #include "entry.h" |
| #include "setup.h" |
| #include "symlinks.h" |
| #include "wildmatch.h" |
| #include "ws.h" |
| |
| struct gitdiff_data { |
| struct strbuf *root; |
| int linenr; |
| int p_value; |
| }; |
| |
| static void git_apply_config(void) |
| { |
| git_config_get_string("apply.whitespace", &apply_default_whitespace); |
| git_config_get_string("apply.ignorewhitespace", &apply_default_ignorewhitespace); |
| git_config(git_xmerge_config, NULL); |
| } |
| |
| static int parse_whitespace_option(struct apply_state *state, const char *option) |
| { |
| if (!option) { |
| state->ws_error_action = warn_on_ws_error; |
| return 0; |
| } |
| if (!strcmp(option, "warn")) { |
| state->ws_error_action = warn_on_ws_error; |
| return 0; |
| } |
| if (!strcmp(option, "nowarn")) { |
| state->ws_error_action = nowarn_ws_error; |
| return 0; |
| } |
| if (!strcmp(option, "error")) { |
| state->ws_error_action = die_on_ws_error; |
| return 0; |
| } |
| if (!strcmp(option, "error-all")) { |
| state->ws_error_action = die_on_ws_error; |
| state->squelch_whitespace_errors = 0; |
| return 0; |
| } |
| if (!strcmp(option, "strip") || !strcmp(option, "fix")) { |
| state->ws_error_action = correct_ws_error; |
| return 0; |
| } |
| /* |
| * Please update $__git_whitespacelist in git-completion.bash, |
| * Documentation/git-apply.txt, and Documentation/git-am.txt |
| * when you add new options. |
| */ |
| return error(_("unrecognized whitespace option '%s'"), option); |
| } |
| |
| static int parse_ignorewhitespace_option(struct apply_state *state, |
| const char *option) |
| { |
| if (!option || !strcmp(option, "no") || |
| !strcmp(option, "false") || !strcmp(option, "never") || |
| !strcmp(option, "none")) { |
| state->ws_ignore_action = ignore_ws_none; |
| return 0; |
| } |
| if (!strcmp(option, "change")) { |
| state->ws_ignore_action = ignore_ws_change; |
| return 0; |
| } |
| return error(_("unrecognized whitespace ignore option '%s'"), option); |
| } |
| |
| int init_apply_state(struct apply_state *state, |
| struct repository *repo, |
| const char *prefix) |
| { |
| memset(state, 0, sizeof(*state)); |
| state->prefix = prefix; |
| state->repo = repo; |
| state->apply = 1; |
| state->line_termination = '\n'; |
| state->p_value = 1; |
| state->p_context = UINT_MAX; |
| state->squelch_whitespace_errors = 5; |
| state->ws_error_action = warn_on_ws_error; |
| state->ws_ignore_action = ignore_ws_none; |
| state->linenr = 1; |
| string_list_init_nodup(&state->fn_table); |
| string_list_init_nodup(&state->limit_by_name); |
| strset_init(&state->removed_symlinks); |
| strset_init(&state->kept_symlinks); |
| strbuf_init(&state->root, 0); |
| |
| git_apply_config(); |
| if (apply_default_whitespace && parse_whitespace_option(state, apply_default_whitespace)) |
| return -1; |
| if (apply_default_ignorewhitespace && parse_ignorewhitespace_option(state, apply_default_ignorewhitespace)) |
| return -1; |
| return 0; |
| } |
| |
| void clear_apply_state(struct apply_state *state) |
| { |
| string_list_clear(&state->limit_by_name, 0); |
| strset_clear(&state->removed_symlinks); |
| strset_clear(&state->kept_symlinks); |
| strbuf_release(&state->root); |
| |
| /* &state->fn_table is cleared at the end of apply_patch() */ |
| } |
| |
| static void mute_routine(const char *msg UNUSED, va_list params UNUSED) |
| { |
| /* do nothing */ |
| } |
| |
| int check_apply_state(struct apply_state *state, int force_apply) |
| { |
| int is_not_gitdir = !startup_info->have_repository; |
| |
| if (state->apply_with_reject && state->threeway) |
| return error(_("options '%s' and '%s' cannot be used together"), "--reject", "--3way"); |
| if (state->threeway) { |
| if (is_not_gitdir) |
| return error(_("'%s' outside a repository"), "--3way"); |
| state->check_index = 1; |
| } |
| if (state->apply_with_reject) { |
| state->apply = 1; |
| if (state->apply_verbosity == verbosity_normal) |
| state->apply_verbosity = verbosity_verbose; |
| } |
| if (!force_apply && (state->diffstat || state->numstat || state->summary || state->check || state->fake_ancestor)) |
| state->apply = 0; |
| if (state->check_index && is_not_gitdir) |
| return error(_("'%s' outside a repository"), "--index"); |
| if (state->cached) { |
| if (is_not_gitdir) |
| return error(_("'%s' outside a repository"), "--cached"); |
| state->check_index = 1; |
| } |
| if (state->ita_only && (state->check_index || is_not_gitdir)) |
| state->ita_only = 0; |
| if (state->check_index) |
| state->unsafe_paths = 0; |
| |
| if (state->apply_verbosity <= verbosity_silent) { |
| state->saved_error_routine = get_error_routine(); |
| state->saved_warn_routine = get_warn_routine(); |
| set_error_routine(mute_routine); |
| set_warn_routine(mute_routine); |
| } |
| |
| return 0; |
| } |
| |
| static void set_default_whitespace_mode(struct apply_state *state) |
| { |
| if (!state->whitespace_option && !apply_default_whitespace) |
| state->ws_error_action = (state->apply ? warn_on_ws_error : nowarn_ws_error); |
| } |
| |
| /* |
| * This represents one "hunk" from a patch, starting with |
| * "@@ -oldpos,oldlines +newpos,newlines @@" marker. The |
| * patch text is pointed at by patch, and its byte length |
| * is stored in size. leading and trailing are the number |
| * of context lines. |
| */ |
| struct fragment { |
| unsigned long leading, trailing; |
| unsigned long oldpos, oldlines; |
| unsigned long newpos, newlines; |
| /* |
| * 'patch' is usually borrowed from buf in apply_patch(), |
| * but some codepaths store an allocated buffer. |
| */ |
| const char *patch; |
| unsigned free_patch:1, |
| rejected:1; |
| int size; |
| int linenr; |
| struct fragment *next; |
| }; |
| |
| /* |
| * When dealing with a binary patch, we reuse "leading" field |
| * to store the type of the binary hunk, either deflated "delta" |
| * or deflated "literal". |
| */ |
| #define binary_patch_method leading |
| #define BINARY_DELTA_DEFLATED 1 |
| #define BINARY_LITERAL_DEFLATED 2 |
| |
| static void free_fragment_list(struct fragment *list) |
| { |
| while (list) { |
| struct fragment *next = list->next; |
| if (list->free_patch) |
| free((char *)list->patch); |
| free(list); |
| list = next; |
| } |
| } |
| |
| void release_patch(struct patch *patch) |
| { |
| free_fragment_list(patch->fragments); |
| free(patch->def_name); |
| free(patch->old_name); |
| free(patch->new_name); |
| free(patch->result); |
| } |
| |
| static void free_patch(struct patch *patch) |
| { |
| release_patch(patch); |
| free(patch); |
| } |
| |
| static void free_patch_list(struct patch *list) |
| { |
| while (list) { |
| struct patch *next = list->next; |
| free_patch(list); |
| list = next; |
| } |
| } |
| |
| /* |
| * A line in a file, len-bytes long (includes the terminating LF, |
| * except for an incomplete line at the end if the file ends with |
| * one), and its contents hashes to 'hash'. |
| */ |
| struct line { |
| size_t len; |
| unsigned hash : 24; |
| unsigned flag : 8; |
| #define LINE_COMMON 1 |
| #define LINE_PATCHED 2 |
| }; |
| |
| /* |
| * This represents a "file", which is an array of "lines". |
| */ |
| struct image { |
| char *buf; |
| size_t len; |
| size_t nr; |
| size_t alloc; |
| struct line *line_allocated; |
| struct line *line; |
| }; |
| |
| static uint32_t hash_line(const char *cp, size_t len) |
| { |
| size_t i; |
| uint32_t h; |
| for (i = 0, h = 0; i < len; i++) { |
| if (!isspace(cp[i])) { |
| h = h * 3 + (cp[i] & 0xff); |
| } |
| } |
| return h; |
| } |
| |
| /* |
| * Compare lines s1 of length n1 and s2 of length n2, ignoring |
| * whitespace difference. Returns 1 if they match, 0 otherwise |
| */ |
| static int fuzzy_matchlines(const char *s1, size_t n1, |
| const char *s2, size_t n2) |
| { |
| const char *end1 = s1 + n1; |
| const char *end2 = s2 + n2; |
| |
| /* ignore line endings */ |
| while (s1 < end1 && (end1[-1] == '\r' || end1[-1] == '\n')) |
| end1--; |
| while (s2 < end2 && (end2[-1] == '\r' || end2[-1] == '\n')) |
| end2--; |
| |
| while (s1 < end1 && s2 < end2) { |
| if (isspace(*s1)) { |
| /* |
| * Skip whitespace. We check on both buffers |
| * because we don't want "a b" to match "ab". |
| */ |
| if (!isspace(*s2)) |
| return 0; |
| while (s1 < end1 && isspace(*s1)) |
| s1++; |
| while (s2 < end2 && isspace(*s2)) |
| s2++; |
| } else if (*s1++ != *s2++) |
| return 0; |
| } |
| |
| /* If we reached the end on one side only, lines don't match. */ |
| return s1 == end1 && s2 == end2; |
| } |
| |
| static void add_line_info(struct image *img, const char *bol, size_t len, unsigned flag) |
| { |
| ALLOC_GROW(img->line_allocated, img->nr + 1, img->alloc); |
| img->line_allocated[img->nr].len = len; |
| img->line_allocated[img->nr].hash = hash_line(bol, len); |
| img->line_allocated[img->nr].flag = flag; |
| img->nr++; |
| } |
| |
| /* |
| * "buf" has the file contents to be patched (read from various sources). |
| * attach it to "image" and add line-based index to it. |
| * "image" now owns the "buf". |
| */ |
| static void prepare_image(struct image *image, char *buf, size_t len, |
| int prepare_linetable) |
| { |
| const char *cp, *ep; |
| |
| memset(image, 0, sizeof(*image)); |
| image->buf = buf; |
| image->len = len; |
| |
| if (!prepare_linetable) |
| return; |
| |
| ep = image->buf + image->len; |
| cp = image->buf; |
| while (cp < ep) { |
| const char *next; |
| for (next = cp; next < ep && *next != '\n'; next++) |
| ; |
| if (next < ep) |
| next++; |
| add_line_info(image, cp, next - cp, 0); |
| cp = next; |
| } |
| image->line = image->line_allocated; |
| } |
| |
| static void clear_image(struct image *image) |
| { |
| free(image->buf); |
| free(image->line_allocated); |
| memset(image, 0, sizeof(*image)); |
| } |
| |
| /* fmt must contain _one_ %s and no other substitution */ |
| static void say_patch_name(FILE *output, const char *fmt, struct patch *patch) |
| { |
| struct strbuf sb = STRBUF_INIT; |
| |
| if (patch->old_name && patch->new_name && |
| strcmp(patch->old_name, patch->new_name)) { |
| quote_c_style(patch->old_name, &sb, NULL, 0); |
| strbuf_addstr(&sb, " => "); |
| quote_c_style(patch->new_name, &sb, NULL, 0); |
| } else { |
| const char *n = patch->new_name; |
| if (!n) |
| n = patch->old_name; |
| quote_c_style(n, &sb, NULL, 0); |
| } |
| fprintf(output, fmt, sb.buf); |
| fputc('\n', output); |
| strbuf_release(&sb); |
| } |
| |
| #define SLOP (16) |
| |
| /* |
| * apply.c isn't equipped to handle arbitrarily large patches, because |
| * it intermingles `unsigned long` with `int` for the type used to store |
| * buffer lengths. |
| * |
| * Only process patches that are just shy of 1 GiB large in order to |
| * avoid any truncation or overflow issues. |
| */ |
| #define MAX_APPLY_SIZE (1024UL * 1024 * 1023) |
| |
| static int read_patch_file(struct strbuf *sb, int fd) |
| { |
| if (strbuf_read(sb, fd, 0) < 0) |
| return error_errno(_("failed to read patch")); |
| else if (sb->len >= MAX_APPLY_SIZE) |
| return error(_("patch too large")); |
| /* |
| * Make sure that we have some slop in the buffer |
| * so that we can do speculative "memcmp" etc, and |
| * see to it that it is NUL-filled. |
| */ |
| strbuf_grow(sb, SLOP); |
| memset(sb->buf + sb->len, 0, SLOP); |
| return 0; |
| } |
| |
| static unsigned long linelen(const char *buffer, unsigned long size) |
| { |
| unsigned long len = 0; |
| while (size--) { |
| len++; |
| if (*buffer++ == '\n') |
| break; |
| } |
| return len; |
| } |
| |
| static int is_dev_null(const char *str) |
| { |
| return skip_prefix(str, "/dev/null", &str) && isspace(*str); |
| } |
| |
| #define TERM_SPACE 1 |
| #define TERM_TAB 2 |
| |
| static int name_terminate(int c, int terminate) |
| { |
| if (c == ' ' && !(terminate & TERM_SPACE)) |
| return 0; |
| if (c == '\t' && !(terminate & TERM_TAB)) |
| return 0; |
| |
| return 1; |
| } |
| |
| /* remove double slashes to make --index work with such filenames */ |
| static char *squash_slash(char *name) |
| { |
| int i = 0, j = 0; |
| |
| if (!name) |
| return NULL; |
| |
| while (name[i]) { |
| if ((name[j++] = name[i++]) == '/') |
| while (name[i] == '/') |
| i++; |
| } |
| name[j] = '\0'; |
| return name; |
| } |
| |
| static char *find_name_gnu(struct strbuf *root, |
| const char *line, |
| int p_value) |
| { |
| struct strbuf name = STRBUF_INIT; |
| char *cp; |
| |
| /* |
| * Proposed "new-style" GNU patch/diff format; see |
| * https://lore.kernel.org/git/7vll0wvb2a.fsf@assigned-by-dhcp.cox.net/ |
| */ |
| if (unquote_c_style(&name, line, NULL)) { |
| strbuf_release(&name); |
| return NULL; |
| } |
| |
| for (cp = name.buf; p_value; p_value--) { |
| cp = strchr(cp, '/'); |
| if (!cp) { |
| strbuf_release(&name); |
| return NULL; |
| } |
| cp++; |
| } |
| |
| strbuf_remove(&name, 0, cp - name.buf); |
| if (root->len) |
| strbuf_insert(&name, 0, root->buf, root->len); |
| return squash_slash(strbuf_detach(&name, NULL)); |
| } |
| |
| static size_t sane_tz_len(const char *line, size_t len) |
| { |
| const char *tz, *p; |
| |
| if (len < strlen(" +0500") || line[len-strlen(" +0500")] != ' ') |
| return 0; |
| tz = line + len - strlen(" +0500"); |
| |
| if (tz[1] != '+' && tz[1] != '-') |
| return 0; |
| |
| for (p = tz + 2; p != line + len; p++) |
| if (!isdigit(*p)) |
| return 0; |
| |
| return line + len - tz; |
| } |
| |
| static size_t tz_with_colon_len(const char *line, size_t len) |
| { |
| const char *tz, *p; |
| |
| if (len < strlen(" +08:00") || line[len - strlen(":00")] != ':') |
| return 0; |
| tz = line + len - strlen(" +08:00"); |
| |
| if (tz[0] != ' ' || (tz[1] != '+' && tz[1] != '-')) |
| return 0; |
| p = tz + 2; |
| if (!isdigit(*p++) || !isdigit(*p++) || *p++ != ':' || |
| !isdigit(*p++) || !isdigit(*p++)) |
| return 0; |
| |
| return line + len - tz; |
| } |
| |
| static size_t date_len(const char *line, size_t len) |
| { |
| const char *date, *p; |
| |
| if (len < strlen("72-02-05") || line[len-strlen("-05")] != '-') |
| return 0; |
| p = date = line + len - strlen("72-02-05"); |
| |
| if (!isdigit(*p++) || !isdigit(*p++) || *p++ != '-' || |
| !isdigit(*p++) || !isdigit(*p++) || *p++ != '-' || |
| !isdigit(*p++) || !isdigit(*p++)) /* Not a date. */ |
| return 0; |
| |
| if (date - line >= strlen("19") && |
| isdigit(date[-1]) && isdigit(date[-2])) /* 4-digit year */ |
| date -= strlen("19"); |
| |
| return line + len - date; |
| } |
| |
| static size_t short_time_len(const char *line, size_t len) |
| { |
| const char *time, *p; |
| |
| if (len < strlen(" 07:01:32") || line[len-strlen(":32")] != ':') |
| return 0; |
| p = time = line + len - strlen(" 07:01:32"); |
| |
| /* Permit 1-digit hours? */ |
| if (*p++ != ' ' || |
| !isdigit(*p++) || !isdigit(*p++) || *p++ != ':' || |
| !isdigit(*p++) || !isdigit(*p++) || *p++ != ':' || |
| !isdigit(*p++) || !isdigit(*p++)) /* Not a time. */ |
| return 0; |
| |
| return line + len - time; |
| } |
| |
| static size_t fractional_time_len(const char *line, size_t len) |
| { |
| const char *p; |
| size_t n; |
| |
| /* Expected format: 19:41:17.620000023 */ |
| if (!len || !isdigit(line[len - 1])) |
| return 0; |
| p = line + len - 1; |
| |
| /* Fractional seconds. */ |
| while (p > line && isdigit(*p)) |
| p--; |
| if (*p != '.') |
| return 0; |
| |
| /* Hours, minutes, and whole seconds. */ |
| n = short_time_len(line, p - line); |
| if (!n) |
| return 0; |
| |
| return line + len - p + n; |
| } |
| |
| static size_t trailing_spaces_len(const char *line, size_t len) |
| { |
| const char *p; |
| |
| /* Expected format: ' ' x (1 or more) */ |
| if (!len || line[len - 1] != ' ') |
| return 0; |
| |
| p = line + len; |
| while (p != line) { |
| p--; |
| if (*p != ' ') |
| return line + len - (p + 1); |
| } |
| |
| /* All spaces! */ |
| return len; |
| } |
| |
| static size_t diff_timestamp_len(const char *line, size_t len) |
| { |
| const char *end = line + len; |
| size_t n; |
| |
| /* |
| * Posix: 2010-07-05 19:41:17 |
| * GNU: 2010-07-05 19:41:17.620000023 -0500 |
| */ |
| |
| if (!isdigit(end[-1])) |
| return 0; |
| |
| n = sane_tz_len(line, end - line); |
| if (!n) |
| n = tz_with_colon_len(line, end - line); |
| end -= n; |
| |
| n = short_time_len(line, end - line); |
| if (!n) |
| n = fractional_time_len(line, end - line); |
| end -= n; |
| |
| n = date_len(line, end - line); |
| if (!n) /* No date. Too bad. */ |
| return 0; |
| end -= n; |
| |
| if (end == line) /* No space before date. */ |
| return 0; |
| if (end[-1] == '\t') { /* Success! */ |
| end--; |
| return line + len - end; |
| } |
| if (end[-1] != ' ') /* No space before date. */ |
| return 0; |
| |
| /* Whitespace damage. */ |
| end -= trailing_spaces_len(line, end - line); |
| return line + len - end; |
| } |
| |
| static char *find_name_common(struct strbuf *root, |
| const char *line, |
| const char *def, |
| int p_value, |
| const char *end, |
| int terminate) |
| { |
| int len; |
| const char *start = NULL; |
| |
| if (p_value == 0) |
| start = line; |
| while (line != end) { |
| char c = *line; |
| |
| if (!end && isspace(c)) { |
| if (c == '\n') |
| break; |
| if (name_terminate(c, terminate)) |
| break; |
| } |
| line++; |
| if (c == '/' && !--p_value) |
| start = line; |
| } |
| if (!start) |
| return squash_slash(xstrdup_or_null(def)); |
| len = line - start; |
| if (!len) |
| return squash_slash(xstrdup_or_null(def)); |
| |
| /* |
| * Generally we prefer the shorter name, especially |
| * if the other one is just a variation of that with |
| * something else tacked on to the end (ie "file.orig" |
| * or "file~"). |
| */ |
| if (def) { |
| int deflen = strlen(def); |
| if (deflen < len && !strncmp(start, def, deflen)) |
| return squash_slash(xstrdup(def)); |
| } |
| |
| if (root->len) { |
| char *ret = xstrfmt("%s%.*s", root->buf, len, start); |
| return squash_slash(ret); |
| } |
| |
| return squash_slash(xmemdupz(start, len)); |
| } |
| |
| static char *find_name(struct strbuf *root, |
| const char *line, |
| char *def, |
| int p_value, |
| int terminate) |
| { |
| if (*line == '"') { |
| char *name = find_name_gnu(root, line, p_value); |
| if (name) |
| return name; |
| } |
| |
| return find_name_common(root, line, def, p_value, NULL, terminate); |
| } |
| |
| static char *find_name_traditional(struct strbuf *root, |
| const char *line, |
| char *def, |
| int p_value) |
| { |
| size_t len; |
| size_t date_len; |
| |
| if (*line == '"') { |
| char *name = find_name_gnu(root, line, p_value); |
| if (name) |
| return name; |
| } |
| |
| len = strchrnul(line, '\n') - line; |
| date_len = diff_timestamp_len(line, len); |
| if (!date_len) |
| return find_name_common(root, line, def, p_value, NULL, TERM_TAB); |
| len -= date_len; |
| |
| return find_name_common(root, line, def, p_value, line + len, 0); |
| } |
| |
| /* |
| * Given the string after "--- " or "+++ ", guess the appropriate |
| * p_value for the given patch. |
| */ |
| static int guess_p_value(struct apply_state *state, const char *nameline) |
| { |
| char *name, *cp; |
| int val = -1; |
| |
| if (is_dev_null(nameline)) |
| return -1; |
| name = find_name_traditional(&state->root, nameline, NULL, 0); |
| if (!name) |
| return -1; |
| cp = strchr(name, '/'); |
| if (!cp) |
| val = 0; |
| else if (state->prefix) { |
| /* |
| * Does it begin with "a/$our-prefix" and such? Then this is |
| * very likely to apply to our directory. |
| */ |
| if (starts_with(name, state->prefix)) |
| val = count_slashes(state->prefix); |
| else { |
| cp++; |
| if (starts_with(cp, state->prefix)) |
| val = count_slashes(state->prefix) + 1; |
| } |
| } |
| free(name); |
| return val; |
| } |
| |
| /* |
| * Does the ---/+++ line have the POSIX timestamp after the last HT? |
| * GNU diff puts epoch there to signal a creation/deletion event. Is |
| * this such a timestamp? |
| */ |
| static int has_epoch_timestamp(const char *nameline) |
| { |
| /* |
| * We are only interested in epoch timestamp; any non-zero |
| * fraction cannot be one, hence "(\.0+)?" in the regexp below. |
| * For the same reason, the date must be either 1969-12-31 or |
| * 1970-01-01, and the seconds part must be "00". |
| */ |
| const char stamp_regexp[] = |
| "^[0-2][0-9]:([0-5][0-9]):00(\\.0+)?" |
| " " |
| "([-+][0-2][0-9]:?[0-5][0-9])\n"; |
| const char *timestamp = NULL, *cp, *colon; |
| static regex_t *stamp; |
| regmatch_t m[10]; |
| int zoneoffset, epoch_hour, hour, minute; |
| int status; |
| |
| for (cp = nameline; *cp != '\n'; cp++) { |
| if (*cp == '\t') |
| timestamp = cp + 1; |
| } |
| if (!timestamp) |
| return 0; |
| |
| /* |
| * YYYY-MM-DD hh:mm:ss must be from either 1969-12-31 |
| * (west of GMT) or 1970-01-01 (east of GMT) |
| */ |
| if (skip_prefix(timestamp, "1969-12-31 ", ×tamp)) |
| epoch_hour = 24; |
| else if (skip_prefix(timestamp, "1970-01-01 ", ×tamp)) |
| epoch_hour = 0; |
| else |
| return 0; |
| |
| if (!stamp) { |
| stamp = xmalloc(sizeof(*stamp)); |
| if (regcomp(stamp, stamp_regexp, REG_EXTENDED)) { |
| warning(_("Cannot prepare timestamp regexp %s"), |
| stamp_regexp); |
| return 0; |
| } |
| } |
| |
| status = regexec(stamp, timestamp, ARRAY_SIZE(m), m, 0); |
| if (status) { |
| if (status != REG_NOMATCH) |
| warning(_("regexec returned %d for input: %s"), |
| status, timestamp); |
| return 0; |
| } |
| |
| hour = strtol(timestamp, NULL, 10); |
| minute = strtol(timestamp + m[1].rm_so, NULL, 10); |
| |
| zoneoffset = strtol(timestamp + m[3].rm_so + 1, (char **) &colon, 10); |
| if (*colon == ':') |
| zoneoffset = zoneoffset * 60 + strtol(colon + 1, NULL, 10); |
| else |
| zoneoffset = (zoneoffset / 100) * 60 + (zoneoffset % 100); |
| if (timestamp[m[3].rm_so] == '-') |
| zoneoffset = -zoneoffset; |
| |
| return hour * 60 + minute - zoneoffset == epoch_hour * 60; |
| } |
| |
| /* |
| * Get the name etc info from the ---/+++ lines of a traditional patch header |
| * |
| * FIXME! The end-of-filename heuristics are kind of screwy. For existing |
| * files, we can happily check the index for a match, but for creating a |
| * new file we should try to match whatever "patch" does. I have no idea. |
| */ |
| static int parse_traditional_patch(struct apply_state *state, |
| const char *first, |
| const char *second, |
| struct patch *patch) |
| { |
| char *name; |
| |
| first += 4; /* skip "--- " */ |
| second += 4; /* skip "+++ " */ |
| if (!state->p_value_known) { |
| int p, q; |
| p = guess_p_value(state, first); |
| q = guess_p_value(state, second); |
| if (p < 0) p = q; |
| if (0 <= p && p == q) { |
| state->p_value = p; |
| state->p_value_known = 1; |
| } |
| } |
| if (is_dev_null(first)) { |
| patch->is_new = 1; |
| patch->is_delete = 0; |
| name = find_name_traditional(&state->root, second, NULL, state->p_value); |
| patch->new_name = name; |
| } else if (is_dev_null(second)) { |
| patch->is_new = 0; |
| patch->is_delete = 1; |
| name = find_name_traditional(&state->root, first, NULL, state->p_value); |
| patch->old_name = name; |
| } else { |
| char *first_name; |
| first_name = find_name_traditional(&state->root, first, NULL, state->p_value); |
| name = find_name_traditional(&state->root, second, first_name, state->p_value); |
| free(first_name); |
| if (has_epoch_timestamp(first)) { |
| patch->is_new = 1; |
| patch->is_delete = 0; |
| patch->new_name = name; |
| } else if (has_epoch_timestamp(second)) { |
| patch->is_new = 0; |
| patch->is_delete = 1; |
| patch->old_name = name; |
| } else { |
| patch->old_name = name; |
| patch->new_name = xstrdup_or_null(name); |
| } |
| } |
| if (!name) |
| return error(_("unable to find filename in patch at line %d"), state->linenr); |
| |
| return 0; |
| } |
| |
| static int gitdiff_hdrend(struct gitdiff_data *state UNUSED, |
| const char *line UNUSED, |
| struct patch *patch UNUSED) |
| { |
| return 1; |
| } |
| |
| /* |
| * We're anal about diff header consistency, to make |
| * sure that we don't end up having strange ambiguous |
| * patches floating around. |
| * |
| * As a result, gitdiff_{old|new}name() will check |
| * their names against any previous information, just |
| * to make sure.. |
| */ |
| #define DIFF_OLD_NAME 0 |
| #define DIFF_NEW_NAME 1 |
| |
| static int gitdiff_verify_name(struct gitdiff_data *state, |
| const char *line, |
| int isnull, |
| char **name, |
| int side) |
| { |
| if (!*name && !isnull) { |
| *name = find_name(state->root, line, NULL, state->p_value, TERM_TAB); |
| return 0; |
| } |
| |
| if (*name) { |
| char *another; |
| if (isnull) |
| return error(_("git apply: bad git-diff - expected /dev/null, got %s on line %d"), |
| *name, state->linenr); |
| another = find_name(state->root, line, NULL, state->p_value, TERM_TAB); |
| if (!another || strcmp(another, *name)) { |
| free(another); |
| return error((side == DIFF_NEW_NAME) ? |
| _("git apply: bad git-diff - inconsistent new filename on line %d") : |
| _("git apply: bad git-diff - inconsistent old filename on line %d"), state->linenr); |
| } |
| free(another); |
| } else { |
| if (!is_dev_null(line)) |
| return error(_("git apply: bad git-diff - expected /dev/null on line %d"), state->linenr); |
| } |
| |
| return 0; |
| } |
| |
| static int gitdiff_oldname(struct gitdiff_data *state, |
| const char *line, |
| struct patch *patch) |
| { |
| return gitdiff_verify_name(state, line, |
| patch->is_new, &patch->old_name, |
| DIFF_OLD_NAME); |
| } |
| |
| static int gitdiff_newname(struct gitdiff_data *state, |
| const char *line, |
| struct patch *patch) |
| { |
| return gitdiff_verify_name(state, line, |
| patch->is_delete, &patch->new_name, |
| DIFF_NEW_NAME); |
| } |
| |
| static int parse_mode_line(const char *line, int linenr, unsigned int *mode) |
| { |
| char *end; |
| *mode = strtoul(line, &end, 8); |
| if (end == line || !isspace(*end)) |
| return error(_("invalid mode on line %d: %s"), linenr, line); |
| return 0; |
| } |
| |
| static int gitdiff_oldmode(struct gitdiff_data *state, |
| const char *line, |
| struct patch *patch) |
| { |
| return parse_mode_line(line, state->linenr, &patch->old_mode); |
| } |
| |
| static int gitdiff_newmode(struct gitdiff_data *state, |
| const char *line, |
| struct patch *patch) |
| { |
| return parse_mode_line(line, state->linenr, &patch->new_mode); |
| } |
| |
| static int gitdiff_delete(struct gitdiff_data *state, |
| const char *line, |
| struct patch *patch) |
| { |
| patch->is_delete = 1; |
| free(patch->old_name); |
| patch->old_name = xstrdup_or_null(patch->def_name); |
| return gitdiff_oldmode(state, line, patch); |
| } |
| |
| static int gitdiff_newfile(struct gitdiff_data *state, |
| const char *line, |
| struct patch *patch) |
| { |
| patch->is_new = 1; |
| free(patch->new_name); |
| patch->new_name = xstrdup_or_null(patch->def_name); |
| return gitdiff_newmode(state, line, patch); |
| } |
| |
| static int gitdiff_copysrc(struct gitdiff_data *state, |
| const char *line, |
| struct patch *patch) |
| { |
| patch->is_copy = 1; |
| free(patch->old_name); |
| patch->old_name = find_name(state->root, line, NULL, state->p_value ? state->p_value - 1 : 0, 0); |
| return 0; |
| } |
| |
| static int gitdiff_copydst(struct gitdiff_data *state, |
| const char *line, |
| struct patch *patch) |
| { |
| patch->is_copy = 1; |
| free(patch->new_name); |
| patch->new_name = find_name(state->root, line, NULL, state->p_value ? state->p_value - 1 : 0, 0); |
| return 0; |
| } |
| |
| static int gitdiff_renamesrc(struct gitdiff_data *state, |
| const char *line, |
| struct patch *patch) |
| { |
| patch->is_rename = 1; |
| free(patch->old_name); |
| patch->old_name = find_name(state->root, line, NULL, state->p_value ? state->p_value - 1 : 0, 0); |
| return 0; |
| } |
| |
| static int gitdiff_renamedst(struct gitdiff_data *state, |
| const char *line, |
| struct patch *patch) |
| { |
| patch->is_rename = 1; |
| free(patch->new_name); |
| patch->new_name = find_name(state->root, line, NULL, state->p_value ? state->p_value - 1 : 0, 0); |
| return 0; |
| } |
| |
| static int gitdiff_similarity(struct gitdiff_data *state UNUSED, |
| const char *line, |
| struct patch *patch) |
| { |
| unsigned long val = strtoul(line, NULL, 10); |
| if (val <= 100) |
| patch->score = val; |
| return 0; |
| } |
| |
| static int gitdiff_dissimilarity(struct gitdiff_data *state UNUSED, |
| const char *line, |
| struct patch *patch) |
| { |
| unsigned long val = strtoul(line, NULL, 10); |
| if (val <= 100) |
| patch->score = val; |
| return 0; |
| } |
| |
| static int gitdiff_index(struct gitdiff_data *state, |
| const char *line, |
| struct patch *patch) |
| { |
| /* |
| * index line is N hexadecimal, "..", N hexadecimal, |
| * and optional space with octal mode. |
| */ |
| const char *ptr, *eol; |
| int len; |
| const unsigned hexsz = the_hash_algo->hexsz; |
| |
| ptr = strchr(line, '.'); |
| if (!ptr || ptr[1] != '.' || hexsz < ptr - line) |
| return 0; |
| len = ptr - line; |
| memcpy(patch->old_oid_prefix, line, len); |
| patch->old_oid_prefix[len] = 0; |
| |
| line = ptr + 2; |
| ptr = strchr(line, ' '); |
| eol = strchrnul(line, '\n'); |
| |
| if (!ptr || eol < ptr) |
| ptr = eol; |
| len = ptr - line; |
| |
| if (hexsz < len) |
| return 0; |
| memcpy(patch->new_oid_prefix, line, len); |
| patch->new_oid_prefix[len] = 0; |
| if (*ptr == ' ') |
| return gitdiff_oldmode(state, ptr + 1, patch); |
| return 0; |
| } |
| |
| /* |
| * This is normal for a diff that doesn't change anything: we'll fall through |
| * into the next diff. Tell the parser to break out. |
| */ |
| static int gitdiff_unrecognized(struct gitdiff_data *state UNUSED, |
| const char *line UNUSED, |
| struct patch *patch UNUSED) |
| { |
| return 1; |
| } |
| |
| /* |
| * Skip p_value leading components from "line"; as we do not accept |
| * absolute paths, return NULL in that case. |
| */ |
| static const char *skip_tree_prefix(int p_value, |
| const char *line, |
| int llen) |
| { |
| int nslash; |
| int i; |
| |
| if (!p_value) |
| return (llen && line[0] == '/') ? NULL : line; |
| |
| nslash = p_value; |
| for (i = 0; i < llen; i++) { |
| int ch = line[i]; |
| if (ch == '/' && --nslash <= 0) |
| return (i == 0) ? NULL : &line[i + 1]; |
| } |
| return NULL; |
| } |
| |
| /* |
| * This is to extract the same name that appears on "diff --git" |
| * line. We do not find and return anything if it is a rename |
| * patch, and it is OK because we will find the name elsewhere. |
| * We need to reliably find name only when it is mode-change only, |
| * creation or deletion of an empty file. In any of these cases, |
| * both sides are the same name under a/ and b/ respectively. |
| */ |
| static char *git_header_name(int p_value, |
| const char *line, |
| int llen) |
| { |
| const char *name; |
| const char *second = NULL; |
| size_t len, line_len; |
| |
| line += strlen("diff --git "); |
| llen -= strlen("diff --git "); |
| |
| if (*line == '"') { |
| const char *cp; |
| struct strbuf first = STRBUF_INIT; |
| struct strbuf sp = STRBUF_INIT; |
| |
| if (unquote_c_style(&first, line, &second)) |
| goto free_and_fail1; |
| |
| /* strip the a/b prefix including trailing slash */ |
| cp = skip_tree_prefix(p_value, first.buf, first.len); |
| if (!cp) |
| goto free_and_fail1; |
| strbuf_remove(&first, 0, cp - first.buf); |
| |
| /* |
| * second points at one past closing dq of name. |
| * find the second name. |
| */ |
| while ((second < line + llen) && isspace(*second)) |
| second++; |
| |
| if (line + llen <= second) |
| goto free_and_fail1; |
| if (*second == '"') { |
| if (unquote_c_style(&sp, second, NULL)) |
| goto free_and_fail1; |
| cp = skip_tree_prefix(p_value, sp.buf, sp.len); |
| if (!cp) |
| goto free_and_fail1; |
| /* They must match, otherwise ignore */ |
| if (strcmp(cp, first.buf)) |
| goto free_and_fail1; |
| strbuf_release(&sp); |
| return strbuf_detach(&first, NULL); |
| } |
| |
| /* unquoted second */ |
| cp = skip_tree_prefix(p_value, second, line + llen - second); |
| if (!cp) |
| goto free_and_fail1; |
| if (line + llen - cp != first.len || |
| memcmp(first.buf, cp, first.len)) |
| goto free_and_fail1; |
| return strbuf_detach(&first, NULL); |
| |
| free_and_fail1: |
| strbuf_release(&first); |
| strbuf_release(&sp); |
| return NULL; |
| } |
| |
| /* unquoted first name */ |
| name = skip_tree_prefix(p_value, line, llen); |
| if (!name) |
| return NULL; |
| |
| /* |
| * since the first name is unquoted, a dq if exists must be |
| * the beginning of the second name. |
| */ |
| for (second = name; second < line + llen; second++) { |
| if (*second == '"') { |
| struct strbuf sp = STRBUF_INIT; |
| const char *np; |
| |
| if (unquote_c_style(&sp, second, NULL)) |
| goto free_and_fail2; |
| |
| np = skip_tree_prefix(p_value, sp.buf, sp.len); |
| if (!np) |
| goto free_and_fail2; |
| |
| len = sp.buf + sp.len - np; |
| if (len < second - name && |
| !strncmp(np, name, len) && |
| isspace(name[len])) { |
| /* Good */ |
| strbuf_remove(&sp, 0, np - sp.buf); |
| return strbuf_detach(&sp, NULL); |
| } |
| |
| free_and_fail2: |
| strbuf_release(&sp); |
| return NULL; |
| } |
| } |
| |
| /* |
| * Accept a name only if it shows up twice, exactly the same |
| * form. |
| */ |
| second = strchr(name, '\n'); |
| if (!second) |
| return NULL; |
| line_len = second - name; |
| for (len = 0 ; ; len++) { |
| switch (name[len]) { |
| default: |
| continue; |
| case '\n': |
| return NULL; |
| case '\t': case ' ': |
| /* |
| * Is this the separator between the preimage |
| * and the postimage pathname? Again, we are |
| * only interested in the case where there is |
| * no rename, as this is only to set def_name |
| * and a rename patch has the names elsewhere |
| * in an unambiguous form. |
| */ |
| if (!name[len + 1]) |
| return NULL; /* no postimage name */ |
| second = skip_tree_prefix(p_value, name + len + 1, |
| line_len - (len + 1)); |
| /* |
| * If we are at the SP at the end of a directory, |
| * skip_tree_prefix() may return NULL as that makes |
| * it appears as if we have an absolute path. |
| * Keep going to find another SP. |
| */ |
| if (!second) |
| continue; |
| |
| /* |
| * Does len bytes starting at "name" and "second" |
| * (that are separated by one HT or SP we just |
| * found) exactly match? |
| */ |
| if (second[len] == '\n' && !strncmp(name, second, len)) |
| return xmemdupz(name, len); |
| } |
| } |
| } |
| |
| static int check_header_line(int linenr, struct patch *patch) |
| { |
| int extensions = (patch->is_delete == 1) + (patch->is_new == 1) + |
| (patch->is_rename == 1) + (patch->is_copy == 1); |
| if (extensions > 1) |
| return error(_("inconsistent header lines %d and %d"), |
| patch->extension_linenr, linenr); |
| if (extensions && !patch->extension_linenr) |
| patch->extension_linenr = linenr; |
| return 0; |
| } |
| |
| int parse_git_diff_header(struct strbuf *root, |
| int *linenr, |
| int p_value, |
| const char *line, |
| int len, |
| unsigned int size, |
| struct patch *patch) |
| { |
| unsigned long offset; |
| struct gitdiff_data parse_hdr_state; |
| |
| /* A git diff has explicit new/delete information, so we don't guess */ |
| patch->is_new = 0; |
| patch->is_delete = 0; |
| |
| /* |
| * Some things may not have the old name in the |
| * rest of the headers anywhere (pure mode changes, |
| * or removing or adding empty files), so we get |
| * the default name from the header. |
| */ |
| patch->def_name = git_header_name(p_value, line, len); |
| if (patch->def_name && root->len) { |
| char *s = xstrfmt("%s%s", root->buf, patch->def_name); |
| free(patch->def_name); |
| patch->def_name = s; |
| } |
| |
| line += len; |
| size -= len; |
| (*linenr)++; |
| parse_hdr_state.root = root; |
| parse_hdr_state.linenr = *linenr; |
| parse_hdr_state.p_value = p_value; |
| |
| for (offset = len ; size > 0 ; offset += len, size -= len, line += len, (*linenr)++) { |
| static const struct opentry { |
| const char *str; |
| int (*fn)(struct gitdiff_data *, const char *, struct patch *); |
| } optable[] = { |
| { "@@ -", gitdiff_hdrend }, |
| { "--- ", gitdiff_oldname }, |
| { "+++ ", gitdiff_newname }, |
| { "old mode ", gitdiff_oldmode }, |
| { "new mode ", gitdiff_newmode }, |
| { "deleted file mode ", gitdiff_delete }, |
| { "new file mode ", gitdiff_newfile }, |
| { "copy from ", gitdiff_copysrc }, |
| { "copy to ", gitdiff_copydst }, |
| { "rename old ", gitdiff_renamesrc }, |
| { "rename new ", gitdiff_renamedst }, |
| { "rename from ", gitdiff_renamesrc }, |
| { "rename to ", gitdiff_renamedst }, |
| { "similarity index ", gitdiff_similarity }, |
| { "dissimilarity index ", gitdiff_dissimilarity }, |
| { "index ", gitdiff_index }, |
| { "", gitdiff_unrecognized }, |
| }; |
| int i; |
| |
| len = linelen(line, size); |
| if (!len || line[len-1] != '\n') |
| break; |
| for (i = 0; i < ARRAY_SIZE(optable); i++) { |
| const struct opentry *p = optable + i; |
| int oplen = strlen(p->str); |
| int res; |
| if (len < oplen || memcmp(p->str, line, oplen)) |
| continue; |
| res = p->fn(&parse_hdr_state, line + oplen, patch); |
| if (res < 0) |
| return -1; |
| if (check_header_line(*linenr, patch)) |
| return -1; |
| if (res > 0) |
| goto done; |
| break; |
| } |
| } |
| |
| done: |
| if (!patch->old_name && !patch->new_name) { |
| if (!patch->def_name) { |
| error(Q_("git diff header lacks filename information when removing " |
| "%d leading pathname component (line %d)", |
| "git diff header lacks filename information when removing " |
| "%d leading pathname components (line %d)", |
| parse_hdr_state.p_value), |
| parse_hdr_state.p_value, *linenr); |
| return -128; |
| } |
| patch->old_name = xstrdup(patch->def_name); |
| patch->new_name = xstrdup(patch->def_name); |
| } |
| if ((!patch->new_name && !patch->is_delete) || |
| (!patch->old_name && !patch->is_new)) { |
| error(_("git diff header lacks filename information " |
| "(line %d)"), *linenr); |
| return -128; |
| } |
| patch->is_toplevel_relative = 1; |
| return offset; |
| } |
| |
| static int parse_num(const char *line, unsigned long *p) |
| { |
| char *ptr; |
| |
| if (!isdigit(*line)) |
| return 0; |
| *p = strtoul(line, &ptr, 10); |
| return ptr - line; |
| } |
| |
| static int parse_range(const char *line, int len, int offset, const char *expect, |
| unsigned long *p1, unsigned long *p2) |
| { |
| int digits, ex; |
| |
| if (offset < 0 || offset >= len) |
| return -1; |
| line += offset; |
| len -= offset; |
| |
| digits = parse_num(line, p1); |
| if (!digits) |
| return -1; |
| |
| offset += digits; |
| line += digits; |
| len -= digits; |
| |
| *p2 = 1; |
| if (*line == ',') { |
| digits = parse_num(line+1, p2); |
| if (!digits) |
| return -1; |
| |
| offset += digits+1; |
| line += digits+1; |
| len -= digits+1; |
| } |
| |
| ex = strlen(expect); |
| if (ex > len) |
| return -1; |
| if (memcmp(line, expect, ex)) |
| return -1; |
| |
| return offset + ex; |
| } |
| |
| static void recount_diff(const char *line, int size, struct fragment *fragment) |
| { |
| int oldlines = 0, newlines = 0, ret = 0; |
| |
| if (size < 1) { |
| warning("recount: ignore empty hunk"); |
| return; |
| } |
| |
| for (;;) { |
| int len = linelen(line, size); |
| size -= len; |
| line += len; |
| |
| if (size < 1) |
| break; |
| |
| switch (*line) { |
| case ' ': case '\n': |
| newlines++; |
| /* fall through */ |
| case '-': |
| oldlines++; |
| continue; |
| case '+': |
| newlines++; |
| continue; |
| case '\\': |
| continue; |
| case '@': |
| ret = size < 3 || !starts_with(line, "@@ "); |
| break; |
| case 'd': |
| ret = size < 5 || !starts_with(line, "diff "); |
| break; |
| default: |
| ret = -1; |
| break; |
| } |
| if (ret) { |
| warning(_("recount: unexpected line: %.*s"), |
| (int)linelen(line, size), line); |
| return; |
| } |
| break; |
| } |
| fragment->oldlines = oldlines; |
| fragment->newlines = newlines; |
| } |
| |
| /* |
| * Parse a unified diff fragment header of the |
| * form "@@ -a,b +c,d @@" |
| */ |
| static int parse_fragment_header(const char *line, int len, struct fragment *fragment) |
| { |
| int offset; |
| |
| if (!len || line[len-1] != '\n') |
| return -1; |
| |
| /* Figure out the number of lines in a fragment */ |
| offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines); |
| offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines); |
| |
| return offset; |
| } |
| |
| /* |
| * Find file diff header |
| * |
| * Returns: |
| * -1 if no header was found |
| * -128 in case of error |
| * the size of the header in bytes (called "offset") otherwise |
| */ |
| static int find_header(struct apply_state *state, |
| const char *line, |
| unsigned long size, |
| int *hdrsize, |
| struct patch *patch) |
| { |
| unsigned long offset, len; |
| |
| patch->is_toplevel_relative = 0; |
| patch->is_rename = patch->is_copy = 0; |
| patch->is_new = patch->is_delete = -1; |
| patch->old_mode = patch->new_mode = 0; |
| patch->old_name = patch->new_name = NULL; |
| for (offset = 0; size > 0; offset += len, size -= len, line += len, state->linenr++) { |
| unsigned long nextlen; |
| |
| len = linelen(line, size); |
| if (!len) |
| break; |
| |
| /* Testing this early allows us to take a few shortcuts.. */ |
| if (len < 6) |
| continue; |
| |
| /* |
| * Make sure we don't find any unconnected patch fragments. |
| * That's a sign that we didn't find a header, and that a |
| * patch has become corrupted/broken up. |
| */ |
| if (!memcmp("@@ -", line, 4)) { |
| struct fragment dummy; |
| if (parse_fragment_header(line, len, &dummy) < 0) |
| continue; |
| error(_("patch fragment without header at line %d: %.*s"), |
| state->linenr, (int)len-1, line); |
| return -128; |
| } |
| |
| if (size < len + 6) |
| break; |
| |
| /* |
| * Git patch? It might not have a real patch, just a rename |
| * or mode change, so we handle that specially |
| */ |
| if (!memcmp("diff --git ", line, 11)) { |
| int git_hdr_len = parse_git_diff_header(&state->root, &state->linenr, |
| state->p_value, line, len, |
| size, patch); |
| if (git_hdr_len < 0) |
| return -128; |
| if (git_hdr_len <= len) |
| continue; |
| *hdrsize = git_hdr_len; |
| return offset; |
| } |
| |
| /* --- followed by +++ ? */ |
| if (memcmp("--- ", line, 4) || memcmp("+++ ", line + len, 4)) |
| continue; |
| |
| /* |
| * We only accept unified patches, so we want it to |
| * at least have "@@ -a,b +c,d @@\n", which is 14 chars |
| * minimum ("@@ -0,0 +1 @@\n" is the shortest). |
| */ |
| nextlen = linelen(line + len, size - len); |
| if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4)) |
| continue; |
| |
| /* Ok, we'll consider it a patch */ |
| if (parse_traditional_patch(state, line, line+len, patch)) |
| return -128; |
| *hdrsize = len + nextlen; |
| state->linenr += 2; |
| return offset; |
| } |
| return -1; |
| } |
| |
| static void record_ws_error(struct apply_state *state, |
| unsigned result, |
| const char *line, |
| int len, |
| int linenr) |
| { |
| char *err; |
| |
| if (!result) |
| return; |
| |
| state->whitespace_error++; |
| if (state->squelch_whitespace_errors && |
| state->squelch_whitespace_errors < state->whitespace_error) |
| return; |
| |
| err = whitespace_error_string(result); |
| if (state->apply_verbosity > verbosity_silent) |
| fprintf(stderr, "%s:%d: %s.\n%.*s\n", |
| state->patch_input_file, linenr, err, len, line); |
| free(err); |
| } |
| |
| static void check_whitespace(struct apply_state *state, |
| const char *line, |
| int len, |
| unsigned ws_rule) |
| { |
| unsigned result = ws_check(line + 1, len - 1, ws_rule); |
| |
| record_ws_error(state, result, line + 1, len - 2, state->linenr); |
| } |
| |
| /* |
| * Check if the patch has context lines with CRLF or |
| * the patch wants to remove lines with CRLF. |
| */ |
| static void check_old_for_crlf(struct patch *patch, const char *line, int len) |
| { |
| if (len >= 2 && line[len-1] == '\n' && line[len-2] == '\r') { |
| patch->ws_rule |= WS_CR_AT_EOL; |
| patch->crlf_in_old = 1; |
| } |
| } |
| |
| |
| /* |
| * Parse a unified diff. Note that this really needs to parse each |
| * fragment separately, since the only way to know the difference |
| * between a "---" that is part of a patch, and a "---" that starts |
| * the next patch is to look at the line counts.. |
| */ |
| static int parse_fragment(struct apply_state *state, |
| const char *line, |
| unsigned long size, |
| struct patch *patch, |
| struct fragment *fragment) |
| { |
| int added, deleted; |
| int len = linelen(line, size), offset; |
| unsigned long oldlines, newlines; |
| unsigned long leading, trailing; |
| |
| offset = parse_fragment_header(line, len, fragment); |
| if (offset < 0) |
| return -1; |
| if (offset > 0 && patch->recount) |
| recount_diff(line + offset, size - offset, fragment); |
| oldlines = fragment->oldlines; |
| newlines = fragment->newlines; |
| leading = 0; |
| trailing = 0; |
| |
| /* Parse the thing.. */ |
| line += len; |
| size -= len; |
| state->linenr++; |
| added = deleted = 0; |
| for (offset = len; |
| 0 < size; |
| offset += len, size -= len, line += len, state->linenr++) { |
| if (!oldlines && !newlines) |
| break; |
| len = linelen(line, size); |
| if (!len || line[len-1] != '\n') |
| return -1; |
| switch (*line) { |
| default: |
| return -1; |
| case '\n': /* newer GNU diff, an empty context line */ |
| case ' ': |
| oldlines--; |
| newlines--; |
| if (!deleted && !added) |
| leading++; |
| trailing++; |
| check_old_for_crlf(patch, line, len); |
| if (!state->apply_in_reverse && |
| state->ws_error_action == correct_ws_error) |
| check_whitespace(state, line, len, patch->ws_rule); |
| break; |
| case '-': |
| if (!state->apply_in_reverse) |
| check_old_for_crlf(patch, line, len); |
| if (state->apply_in_reverse && |
| state->ws_error_action != nowarn_ws_error) |
| check_whitespace(state, line, len, patch->ws_rule); |
| deleted++; |
| oldlines--; |
| trailing = 0; |
| break; |
| case '+': |
| if (state->apply_in_reverse) |
| check_old_for_crlf(patch, line, len); |
| if (!state->apply_in_reverse && |
| state->ws_error_action != nowarn_ws_error) |
| check_whitespace(state, line, len, patch->ws_rule); |
| added++; |
| newlines--; |
| trailing = 0; |
| break; |
| |
| /* |
| * We allow "\ No newline at end of file". Depending |
| * on locale settings when the patch was produced we |
| * don't know what this line looks like. The only |
| * thing we do know is that it begins with "\ ". |
| * Checking for 12 is just for sanity check -- any |
| * l10n of "\ No newline..." is at least that long. |
| */ |
| case '\\': |
| if (len < 12 || memcmp(line, "\\ ", 2)) |
| return -1; |
| break; |
| } |
| } |
| if (oldlines || newlines) |
| return -1; |
| if (!patch->recount && !deleted && !added) |
| return -1; |
| |
| fragment->leading = leading; |
| fragment->trailing = trailing; |
| |
| /* |
| * If a fragment ends with an incomplete line, we failed to include |
| * it in the above loop because we hit oldlines == newlines == 0 |
| * before seeing it. |
| */ |
| if (12 < size && !memcmp(line, "\\ ", 2)) |
| offset += linelen(line, size); |
| |
| patch->lines_added += added; |
| patch->lines_deleted += deleted; |
| |
| if (0 < patch->is_new && oldlines) |
| return error(_("new file depends on old contents")); |
| if (0 < patch->is_delete && newlines) |
| return error(_("deleted file still has contents")); |
| return offset; |
| } |
| |
| /* |
| * We have seen "diff --git a/... b/..." header (or a traditional patch |
| * header). Read hunks that belong to this patch into fragments and hang |
| * them to the given patch structure. |
| * |
| * The (fragment->patch, fragment->size) pair points into the memory given |
| * by the caller, not a copy, when we return. |
| * |
| * Returns: |
| * -1 in case of error, |
| * the number of bytes in the patch otherwise. |
| */ |
| static int parse_single_patch(struct apply_state *state, |
| const char *line, |
| unsigned long size, |
| struct patch *patch) |
| { |
| unsigned long offset = 0; |
| unsigned long oldlines = 0, newlines = 0, context = 0; |
| struct fragment **fragp = &patch->fragments; |
| |
| while (size > 4 && !memcmp(line, "@@ -", 4)) { |
| struct fragment *fragment; |
| int len; |
| |
| CALLOC_ARRAY(fragment, 1); |
| fragment->linenr = state->linenr; |
| len = parse_fragment(state, line, size, patch, fragment); |
| if (len <= 0) { |
| free(fragment); |
| return error(_("corrupt patch at line %d"), state->linenr); |
| } |
| fragment->patch = line; |
| fragment->size = len; |
| oldlines += fragment->oldlines; |
| newlines += fragment->newlines; |
| context += fragment->leading + fragment->trailing; |
| |
| *fragp = fragment; |
| fragp = &fragment->next; |
| |
| offset += len; |
| line += len; |
| size -= len; |
| } |
| |
| /* |
| * If something was removed (i.e. we have old-lines) it cannot |
| * be creation, and if something was added it cannot be |
| * deletion. However, the reverse is not true; --unified=0 |
| * patches that only add are not necessarily creation even |
| * though they do not have any old lines, and ones that only |
| * delete are not necessarily deletion. |
| * |
| * Unfortunately, a real creation/deletion patch do _not_ have |
| * any context line by definition, so we cannot safely tell it |
| * apart with --unified=0 insanity. At least if the patch has |
| * more than one hunk it is not creation or deletion. |
| */ |
| if (patch->is_new < 0 && |
| (oldlines || (patch->fragments && patch->fragments->next))) |
| patch->is_new = 0; |
| if (patch->is_delete < 0 && |
| (newlines || (patch->fragments && patch->fragments->next))) |
| patch->is_delete = 0; |
| |
| if (0 < patch->is_new && oldlines) |
| return error(_("new file %s depends on old contents"), patch->new_name); |
| if (0 < patch->is_delete && newlines) |
| return error(_("deleted file %s still has contents"), patch->old_name); |
| if (!patch->is_delete && !newlines && context && state->apply_verbosity > verbosity_silent) |
| fprintf_ln(stderr, |
| _("** warning: " |
| "file %s becomes empty but is not deleted"), |
| patch->new_name); |
| |
| return offset; |
| } |
| |
| static inline int metadata_changes(struct patch *patch) |
| { |
| return patch->is_rename > 0 || |
| patch->is_copy > 0 || |
| patch->is_new > 0 || |
| patch->is_delete || |
| (patch->old_mode && patch->new_mode && |
| patch->old_mode != patch->new_mode); |
| } |
| |
| static char *inflate_it(const void *data, unsigned long size, |
| unsigned long inflated_size) |
| { |
| git_zstream stream; |
| void *out; |
| int st; |
| |
| memset(&stream, 0, sizeof(stream)); |
| |
| stream.next_in = (unsigned char *)data; |
| stream.avail_in = size; |
| stream.next_out = out = xmalloc(inflated_size); |
| stream.avail_out = inflated_size; |
| git_inflate_init(&stream); |
| st = git_inflate(&stream, Z_FINISH); |
| git_inflate_end(&stream); |
| if ((st != Z_STREAM_END) || stream.total_out != inflated_size) { |
| free(out); |
| return NULL; |
| } |
| return out; |
| } |
| |
| /* |
| * Read a binary hunk and return a new fragment; fragment->patch |
| * points at an allocated memory that the caller must free, so |
| * it is marked as "->free_patch = 1". |
| */ |
| static struct fragment *parse_binary_hunk(struct apply_state *state, |
| char **buf_p, |
| unsigned long *sz_p, |
| int *status_p, |
| int *used_p) |
| { |
| /* |
| * Expect a line that begins with binary patch method ("literal" |
| * or "delta"), followed by the length of data before deflating. |
| * a sequence of 'length-byte' followed by base-85 encoded data |
| * should follow, terminated by a newline. |
| * |
| * Each 5-byte sequence of base-85 encodes up to 4 bytes, |
| * and we would limit the patch line to 66 characters, |
| * so one line can fit up to 13 groups that would decode |
| * to 52 bytes max. The length byte 'A'-'Z' corresponds |
| * to 1-26 bytes, and 'a'-'z' corresponds to 27-52 bytes. |
| */ |
| int llen, used; |
| unsigned long size = *sz_p; |
| char *buffer = *buf_p; |
| int patch_method; |
| unsigned long origlen; |
| char *data = NULL; |
| int hunk_size = 0; |
| struct fragment *frag; |
| |
| llen = linelen(buffer, size); |
| used = llen; |
| |
| *status_p = 0; |
| |
| if (starts_with(buffer, "delta ")) { |
| patch_method = BINARY_DELTA_DEFLATED; |
| origlen = strtoul(buffer + 6, NULL, 10); |
| } |
| else if (starts_with(buffer, "literal ")) { |
| patch_method = BINARY_LITERAL_DEFLATED; |
| origlen = strtoul(buffer + 8, NULL, 10); |
| } |
| else |
| return NULL; |
| |
| state->linenr++; |
| buffer += llen; |
| size -= llen; |
| while (1) { |
| int byte_length, max_byte_length, newsize; |
| llen = linelen(buffer, size); |
| used += llen; |
| state->linenr++; |
| if (llen == 1) { |
| /* consume the blank line */ |
| buffer++; |
| size--; |
| break; |
| } |
| /* |
| * Minimum line is "A00000\n" which is 7-byte long, |
| * and the line length must be multiple of 5 plus 2. |
| */ |
| if ((llen < 7) || (llen-2) % 5) |
| goto corrupt; |
| max_byte_length = (llen - 2) / 5 * 4; |
| byte_length = *buffer; |
| if ('A' <= byte_length && byte_length <= 'Z') |
| byte_length = byte_length - 'A' + 1; |
| else if ('a' <= byte_length && byte_length <= 'z') |
| byte_length = byte_length - 'a' + 27; |
| else |
| goto corrupt; |
| /* if the input length was not multiple of 4, we would |
| * have filler at the end but the filler should never |
| * exceed 3 bytes |
| */ |
| if (max_byte_length < byte_length || |
| byte_length <= max_byte_length - 4) |
| goto corrupt; |
| newsize = hunk_size + byte_length; |
| data = xrealloc(data, newsize); |
| if (decode_85(data + hunk_size, buffer + 1, byte_length)) |
| goto corrupt; |
| hunk_size = newsize; |
| buffer += llen; |
| size -= llen; |
| } |
| |
| CALLOC_ARRAY(frag, 1); |
| frag->patch = inflate_it(data, hunk_size, origlen); |
| frag->free_patch = 1; |
| if (!frag->patch) |
| goto corrupt; |
| free(data); |
| frag->size = origlen; |
| *buf_p = buffer; |
| *sz_p = size; |
| *used_p = used; |
| frag->binary_patch_method = patch_method; |
| return frag; |
| |
| corrupt: |
| free(data); |
| *status_p = -1; |
| error(_("corrupt binary patch at line %d: %.*s"), |
| state->linenr-1, llen-1, buffer); |
| return NULL; |
| } |
| |
| /* |
| * Returns: |
| * -1 in case of error, |
| * the length of the parsed binary patch otherwise |
| */ |
| static int parse_binary(struct apply_state *state, |
| char *buffer, |
| unsigned long size, |
| struct patch *patch) |
| { |
| /* |
| * We have read "GIT binary patch\n"; what follows is a line |
| * that says the patch method (currently, either "literal" or |
| * "delta") and the length of data before deflating; a |
| * sequence of 'length-byte' followed by base-85 encoded data |
| * follows. |
| * |
| * When a binary patch is reversible, there is another binary |
| * hunk in the same format, starting with patch method (either |
| * "literal" or "delta") with the length of data, and a sequence |
| * of length-byte + base-85 encoded data, terminated with another |
| * empty line. This data, when applied to the postimage, produces |
| * the preimage. |
| */ |
| struct fragment *forward; |
| struct fragment *reverse; |
| int status; |
| int used, used_1; |
| |
| forward = parse_binary_hunk(state, &buffer, &size, &status, &used); |
| if (!forward && !status) |
| /* there has to be one hunk (forward hunk) */ |
| return error(_("unrecognized binary patch at line %d"), state->linenr-1); |
| if (status) |
| /* otherwise we already gave an error message */ |
| return status; |
| |
| reverse = parse_binary_hunk(state, &buffer, &size, &status, &used_1); |
| if (reverse) |
| used += used_1; |
| else if (status) { |
| /* |
| * Not having reverse hunk is not an error, but having |
| * a corrupt reverse hunk is. |
| */ |
| free((void*) forward->patch); |
| free(forward); |
| return status; |
| } |
| forward->next = reverse; |
| patch->fragments = forward; |
| patch->is_binary = 1; |
| return used; |
| } |
| |
| static void prefix_one(struct apply_state *state, char **name) |
| { |
| char *old_name = *name; |
| if (!old_name) |
| return; |
| *name = prefix_filename(state->prefix, *name); |
| free(old_name); |
| } |
| |
| static void prefix_patch(struct apply_state *state, struct patch *p) |
| { |
| if (!state->prefix || p->is_toplevel_relative) |
| return; |
| prefix_one(state, &p->new_name); |
| prefix_one(state, &p->old_name); |
| } |
| |
| /* |
| * include/exclude |
| */ |
| |
| static void add_name_limit(struct apply_state *state, |
| const char *name, |
| int exclude) |
| { |
| struct string_list_item *it; |
| |
| it = string_list_append(&state->limit_by_name, name); |
| it->util = exclude ? NULL : (void *) 1; |
| } |
| |
| static int use_patch(struct apply_state *state, struct patch *p) |
| { |
| const char *pathname = p->new_name ? p->new_name : p->old_name; |
| int i; |
| |
| /* Paths outside are not touched regardless of "--include" */ |
| if (state->prefix && *state->prefix) { |
| const char *rest; |
| if (!skip_prefix(pathname, state->prefix, &rest) || !*rest) |
| return 0; |
| } |
| |
| /* See if it matches any of exclude/include rule */ |
| for (i = 0; i < state->limit_by_name.nr; i++) { |
| struct string_list_item *it = &state->limit_by_name.items[i]; |
| if (!wildmatch(it->string, pathname, 0)) |
| return (it->util != NULL); |
| } |
| |
| /* |
| * If we had any include, a path that does not match any rule is |
| * not used. Otherwise, we saw bunch of exclude rules (or none) |
| * and such a path is used. |
| */ |
| return !state->has_include; |
| } |
| |
| /* |
| * Read the patch text in "buffer" that extends for "size" bytes; stop |
| * reading after seeing a single patch (i.e. changes to a single file). |
| * Create fragments (i.e. patch hunks) and hang them to the given patch. |
| * |
| * Returns: |
| * -1 if no header was found or parse_binary() failed, |
| * -128 on another error, |
| * the number of bytes consumed otherwise, |
| * so that the caller can call us again for the next patch. |
| */ |
| static int parse_chunk(struct apply_state *state, char *buffer, unsigned long size, struct patch *patch) |
| { |
| int hdrsize, patchsize; |
| int offset = find_header(state, buffer, size, &hdrsize, patch); |
| |
| if (offset < 0) |
| return offset; |
| |
| prefix_patch(state, patch); |
| |
| if (!use_patch(state, patch)) |
| patch->ws_rule = 0; |
| else if (patch->new_name) |
| patch->ws_rule = whitespace_rule(state->repo->index, |
| patch->new_name); |
| else |
| patch->ws_rule = whitespace_rule(state->repo->index, |
| patch->old_name); |
| |
| patchsize = parse_single_patch(state, |
| buffer + offset + hdrsize, |
| size - offset - hdrsize, |
| patch); |
| |
| if (patchsize < 0) |
| return -128; |
| |
| if (!patchsize) { |
| static const char git_binary[] = "GIT binary patch\n"; |
| int hd = hdrsize + offset; |
| unsigned long llen = linelen(buffer + hd, size - hd); |
| |
| if (llen == sizeof(git_binary) - 1 && |
| !memcmp(git_binary, buffer + hd, llen)) { |
| int used; |
| state->linenr++; |
| used = parse_binary(state, buffer + hd + llen, |
| size - hd - llen, patch); |
| if (used < 0) |
| return -1; |
| if (used) |
| patchsize = used + llen; |
| else |
| patchsize = 0; |
| } |
| else if (!memcmp(" differ\n", buffer + hd + llen - 8, 8)) { |
| static const char *binhdr[] = { |
| "Binary files ", |
| "Files ", |
| NULL, |
| }; |
| int i; |
| for (i = 0; binhdr[i]; i++) { |
| int len = strlen(binhdr[i]); |
| if (len < size - hd && |
| !memcmp(binhdr[i], buffer + hd, len)) { |
| state->linenr++; |
| patch->is_binary = 1; |
| patchsize = llen; |
| break; |
| } |
| } |
| } |
| |
| /* Empty patch cannot be applied if it is a text patch |
| * without metadata change. A binary patch appears |
| * empty to us here. |
| */ |
| if ((state->apply || state->check) && |
| (!patch->is_binary && !metadata_changes(patch))) { |
| error(_("patch with only garbage at line %d"), state->linenr); |
| return -128; |
| } |
| } |
| |
| return offset + hdrsize + patchsize; |
| } |
| |
| static void reverse_patches(struct patch *p) |
| { |
| for (; p; p = p->next) { |
| struct fragment *frag = p->fragments; |
| |
| SWAP(p->new_name, p->old_name); |
| if (p->new_mode) |
| SWAP(p->new_mode, p->old_mode); |
| SWAP(p->is_new, p->is_delete); |
| SWAP(p->lines_added, p->lines_deleted); |
| SWAP(p->old_oid_prefix, p->new_oid_prefix); |
| |
| for (; frag; frag = frag->next) { |
| SWAP(frag->newpos, frag->oldpos); |
| SWAP(frag->newlines, frag->oldlines); |
| } |
| } |
| } |
| |
| static const char pluses[] = |
| "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"; |
| static const char minuses[]= |
| "----------------------------------------------------------------------"; |
| |
| static void show_stats(struct apply_state *state, struct patch *patch) |
| { |
| struct strbuf qname = STRBUF_INIT; |
| char *cp = patch->new_name ? patch->new_name : patch->old_name; |
| int max, add, del; |
| |
| quote_c_style(cp, &qname, NULL, 0); |
| |
| /* |
| * "scale" the filename |
| */ |
| max = state->max_len; |
| if (max > 50) |
| max = 50; |
| |
| if (qname.len > max) { |
| cp = strchr(qname.buf + qname.len + 3 - max, '/'); |
| if (!cp) |
| cp = qname.buf + qname.len + 3 - max; |
| strbuf_splice(&qname, 0, cp - qname.buf, "...", 3); |
| } |
| |
| if (patch->is_binary) { |
| printf(" %-*s | Bin\n", max, qname.buf); |
| strbuf_release(&qname); |
| return; |
| } |
| |
| printf(" %-*s |", max, qname.buf); |
| strbuf_release(&qname); |
| |
| /* |
| * scale the add/delete |
| */ |
| max = max + state->max_change > 70 ? 70 - max : state->max_change; |
| add = patch->lines_added; |
| del = patch->lines_deleted; |
| |
| if (state->max_change > 0) { |
| int total = ((add + del) * max + state->max_change / 2) / state->max_change; |
| add = (add * max + state->max_change / 2) / state->max_change; |
| del = total - add; |
| } |
| printf("%5d %.*s%.*s\n", patch->lines_added + patch->lines_deleted, |
| add, pluses, del, minuses); |
| } |
| |
| static int read_old_data(struct stat *st, struct patch *patch, |
| const char *path, struct strbuf *buf) |
| { |
| int conv_flags = patch->crlf_in_old ? |
| CONV_EOL_KEEP_CRLF : CONV_EOL_RENORMALIZE; |
| switch (st->st_mode & S_IFMT) { |
| case S_IFLNK: |
| if (strbuf_readlink(buf, path, st->st_size) < 0) |
| return error(_("unable to read symlink %s"), path); |
| return 0; |
| case S_IFREG: |
| if (strbuf_read_file(buf, path, st->st_size) != st->st_size) |
| return error(_("unable to open or read %s"), path); |
| /* |
| * "git apply" without "--index/--cached" should never look |
| * at the index; the target file may not have been added to |
| * the index yet, and we may not even be in any Git repository. |
| * Pass NULL to convert_to_git() to stress this; the function |
| * should never look at the index when explicit crlf option |
| * is given. |
| */ |
| convert_to_git(NULL, path, buf->buf, buf->len, buf, conv_flags); |
| return 0; |
| default: |
| return -1; |
| } |
| } |
| |
| /* |
| * Update the preimage, and the common lines in postimage, |
| * from buffer buf of length len. If postlen is 0 the postimage |
| * is updated in place, otherwise it's updated on a new buffer |
| * of length postlen |
| */ |
| |
| static void update_pre_post_images(struct image *preimage, |
| struct image *postimage, |
| char *buf, |
| size_t len, size_t postlen) |
| { |
| int i, ctx, reduced; |
| char *new_buf, *old_buf, *fixed; |
| struct image fixed_preimage; |
| |
| /* |
| * Update the preimage with whitespace fixes. Note that we |
| * are not losing preimage->buf -- apply_one_fragment() will |
| * free "oldlines". |
| */ |
| prepare_image(&fixed_preimage, buf, len, 1); |
| assert(postlen |
| ? fixed_preimage.nr == preimage->nr |
| : fixed_preimage.nr <= preimage->nr); |
| for (i = 0; i < fixed_preimage.nr; i++) |
| fixed_preimage.line[i].flag = preimage->line[i].flag; |
| free(preimage->line_allocated); |
| *preimage = fixed_preimage; |
| |
| /* |
| * Adjust the common context lines in postimage. This can be |
| * done in-place when we are shrinking it with whitespace |
| * fixing, but needs a new buffer when ignoring whitespace or |
| * expanding leading tabs to spaces. |
| * |
| * We trust the caller to tell us if the update can be done |
| * in place (postlen==0) or not. |
| */ |
| old_buf = postimage->buf; |
| if (postlen) |
| new_buf = postimage->buf = xmalloc(postlen); |
| else |
| new_buf = old_buf; |
| fixed = preimage->buf; |
| |
| for (i = reduced = ctx = 0; i < postimage->nr; i++) { |
| size_t l_len = postimage->line[i].len; |
| if (!(postimage->line[i].flag & LINE_COMMON)) { |
| /* an added line -- no counterparts in preimage */ |
| memmove(new_buf, old_buf, l_len); |
| old_buf += l_len; |
| new_buf += l_len; |
| continue; |
| } |
| |
| /* a common context -- skip it in the original postimage */ |
| old_buf += l_len; |
| |
| /* and find the corresponding one in the fixed preimage */ |
| while (ctx < preimage->nr && |
| !(preimage->line[ctx].flag & LINE_COMMON)) { |
| fixed += preimage->line[ctx].len; |
| ctx++; |
| } |
| |
| /* |
| * preimage is expected to run out, if the caller |
| * fixed addition of trailing blank lines. |
| */ |
| if (preimage->nr <= ctx) { |
| reduced++; |
| continue; |
| } |
| |
| /* and copy it in, while fixing the line length */ |
| l_len = preimage->line[ctx].len; |
| memcpy(new_buf, fixed, l_len); |
| new_buf += l_len; |
| fixed += l_len; |
| postimage->line[i].len = l_len; |
| ctx++; |
| } |
| |
| if (postlen |
| ? postlen < new_buf - postimage->buf |
| : postimage->len < new_buf - postimage->buf) |
| BUG("caller miscounted postlen: asked %d, orig = %d, used = %d", |
| (int)postlen, (int) postimage->len, (int)(new_buf - postimage->buf)); |
| |
| /* Fix the length of the whole thing */ |
| postimage->len = new_buf - postimage->buf; |
| postimage->nr -= reduced; |
| } |
| |
| static int line_by_line_fuzzy_match(struct image *img, |
| struct image *preimage, |
| struct image *postimage, |
| unsigned long current, |
| int current_lno, |
| int preimage_limit) |
| { |
| int i; |
| size_t imgoff = 0; |
| size_t preoff = 0; |
| size_t postlen = postimage->len; |
| size_t extra_chars; |
| char *buf; |
| char *preimage_eof; |
| char *preimage_end; |
| struct strbuf fixed; |
| char *fixed_buf; |
| size_t fixed_len; |
| |
| for (i = 0; i < preimage_limit; i++) { |
| size_t prelen = preimage->line[i].len; |
| size_t imglen = img->line[current_lno+i].len; |
| |
| if (!fuzzy_matchlines(img->buf + current + imgoff, imglen, |
| preimage->buf + preoff, prelen)) |
| return 0; |
| if (preimage->line[i].flag & LINE_COMMON) |
| postlen += imglen - prelen; |
| imgoff += imglen; |
| preoff += prelen; |
| } |
| |
| /* |
| * Ok, the preimage matches with whitespace fuzz. |
| * |
| * imgoff now holds the true length of the target that |
| * matches the preimage before the end of the file. |
| * |
| * Count the number of characters in the preimage that fall |
| * beyond the end of the file and make sure that all of them |
| * are whitespace characters. (This can only happen if |
| * we are removing blank lines at the end of the file.) |
| */ |
| buf = preimage_eof = preimage->buf + preoff; |
| for ( ; i < preimage->nr; i++) |
| preoff += preimage->line[i].len; |
| preimage_end = preimage->buf + preoff; |
| for ( ; buf < preimage_end; buf++) |
| if (!isspace(*buf)) |
| return 0; |
| |
| /* |
| * Update the preimage and the common postimage context |
| * lines to use the same whitespace as the target. |
| * If whitespace is missing in the target (i.e. |
| * if the preimage extends beyond the end of the file), |
| * use the whitespace from the preimage. |
| */ |
| extra_chars = preimage_end - preimage_eof; |
| strbuf_init(&fixed, imgoff + extra_chars); |
| strbuf_add(&fixed, img->buf + current, imgoff); |
| strbuf_add(&fixed, preimage_eof, extra_chars); |
| fixed_buf = strbuf_detach(&fixed, &fixed_len); |
| update_pre_post_images(preimage, postimage, |
| fixed_buf, fixed_len, postlen); |
| return 1; |
| } |
| |
| static int match_fragment(struct apply_state *state, |
| struct image *img, |
| struct image *preimage, |
| struct image *postimage, |
| unsigned long current, |
| int current_lno, |
| unsigned ws_rule, |
| int match_beginning, int match_end) |
| { |
| int i; |
| char *fixed_buf, *buf, *orig, *target; |
| struct strbuf fixed; |
| size_t fixed_len, postlen; |
| int preimage_limit; |
| |
| if (preimage->nr + current_lno <= img->nr) { |
| /* |
| * The hunk falls within the boundaries of img. |
| */ |
| preimage_limit = preimage->nr; |
| if (match_end && (preimage->nr + current_lno != img->nr)) |
| return 0; |
| } else if (state->ws_error_action == correct_ws_error && |
| (ws_rule & WS_BLANK_AT_EOF)) { |
| /* |
| * This hunk extends beyond the end of img, and we are |
| * removing blank lines at the end of the file. This |
| * many lines from the beginning of the preimage must |
| * match with img, and the remainder of the preimage |
| * must be blank. |
| */ |
| preimage_limit = img->nr - current_lno; |
| } else { |
| /* |
| * The hunk extends beyond the end of the img and |
| * we are not removing blanks at the end, so we |
| * should reject the hunk at this position. |
| */ |
| return 0; |
| } |
| |
| if (match_beginning && current_lno) |
| return 0; |
| |
| /* Quick hash check */ |
| for (i = 0; i < preimage_limit; i++) |
| if ((img->line[current_lno + i].flag & LINE_PATCHED) || |
| (preimage->line[i].hash != img->line[current_lno + i].hash)) |
| return 0; |
| |
| if (preimage_limit == preimage->nr) { |
| /* |
| * Do we have an exact match? If we were told to match |
| * at the end, size must be exactly at current+fragsize, |
| * otherwise current+fragsize must be still within the preimage, |
| * and either case, the old piece should match the preimage |
| * exactly. |
| */ |
| if ((match_end |
| ? (current + preimage->len == img->len) |
| : (current + preimage->len <= img->len)) && |
| !memcmp(img->buf + current, preimage->buf, preimage->len)) |
| return 1; |
| } else { |
| /* |
| * The preimage extends beyond the end of img, so |
| * there cannot be an exact match. |
| * |
| * There must be one non-blank context line that match |
| * a line before the end of img. |
| */ |
| char *buf_end; |
| |
| buf = preimage->buf; |
| buf_end = buf; |
| for (i = 0; i < preimage_limit; i++) |
| buf_end += preimage->line[i].len; |
| |
| for ( ; buf < buf_end; buf++) |
| if (!isspace(*buf)) |
| break; |
| if (buf == buf_end) |
| return 0; |
| } |
| |
| /* |
| * No exact match. If we are ignoring whitespace, run a line-by-line |
| * fuzzy matching. We collect all the line length information because |
| * we need it to adjust whitespace if we match. |
| */ |
| if (state->ws_ignore_action == ignore_ws_change) |
| return line_by_line_fuzzy_match(img, preimage, postimage, |
| current, current_lno, preimage_limit); |
| |
| if (state->ws_error_action != correct_ws_error) |
| return 0; |
| |
| /* |
| * The hunk does not apply byte-by-byte, but the hash says |
| * it might with whitespace fuzz. We weren't asked to |
| * ignore whitespace, we were asked to correct whitespace |
| * errors, so let's try matching after whitespace correction. |
| * |
| * While checking the preimage against the target, whitespace |
| * errors in both fixed, we count how large the corresponding |
| * postimage needs to be. The postimage prepared by |
| * apply_one_fragment() has whitespace errors fixed on added |
| * lines already, but the common lines were propagated as-is, |
| * which may become longer when their whitespace errors are |
| * fixed. |
| */ |
| |
| /* First count added lines in postimage */ |
| postlen = 0; |
| for (i = 0; i < postimage->nr; i++) { |
| if (!(postimage->line[i].flag & LINE_COMMON)) |
| postlen += postimage->line[i].len; |
| } |
| |
| /* |
| * The preimage may extend beyond the end of the file, |
| * but in this loop we will only handle the part of the |
| * preimage that falls within the file. |
| */ |
| strbuf_init(&fixed, preimage->len + 1); |
| orig = preimage->buf; |
| target = img->buf + current; |
| for (i = 0; i < preimage_limit; i++) { |
| size_t oldlen = preimage->line[i].len; |
| size_t tgtlen = img->line[current_lno + i].len; |
| size_t fixstart = fixed.len; |
| struct strbuf tgtfix; |
| int match; |
| |
| /* Try fixing the line in the preimage */ |
| ws_fix_copy(&fixed, orig, oldlen, ws_rule, NULL); |
| |
| /* Try fixing the line in the target */ |
| strbuf_init(&tgtfix, tgtlen); |
| ws_fix_copy(&tgtfix, target, tgtlen, ws_rule, NULL); |
| |
| /* |
| * If they match, either the preimage was based on |
| * a version before our tree fixed whitespace breakage, |
| * or we are lacking a whitespace-fix patch the tree |
| * the preimage was based on already had (i.e. target |
| * has whitespace breakage, the preimage doesn't). |
| * In either case, we are fixing the whitespace breakages |
| * so we might as well take the fix together with their |
| * real change. |
| */ |
| match = (tgtfix.len == fixed.len - fixstart && |
| !memcmp(tgtfix.buf, fixed.buf + fixstart, |
| fixed.len - fixstart)); |
| |
| /* Add the length if this is common with the postimage */ |
| if (preimage->line[i].flag & LINE_COMMON) |
| postlen += tgtfix.len; |
| |
| strbuf_release(&tgtfix); |
| if (!match) |
| goto unmatch_exit; |
| |
| orig += oldlen; |
| target += tgtlen; |
| } |
| |
| |
| /* |
| * Now handle the lines in the preimage that falls beyond the |
| * end of the file (if any). They will only match if they are |
| * empty or only contain whitespace (if WS_BLANK_AT_EOL is |
| * false). |
| */ |
| for ( ; i < preimage->nr; i++) { |
| size_t fixstart = fixed.len; /* start of the fixed preimage */ |
| size_t oldlen = preimage->line[i].len; |
| int j; |
| |
| /* Try fixing the line in the preimage */ |
| ws_fix_copy(&fixed, orig, oldlen, ws_rule, NULL); |
| |
| for (j = fixstart; j < fixed.len; j++) |
| if (!isspace(fixed.buf[j])) |
| goto unmatch_exit; |
| |
| orig += oldlen; |
| } |
| |
| /* |
| * Yes, the preimage is based on an older version that still |
| * has whitespace breakages unfixed, and fixing them makes the |
| * hunk match. Update the context lines in the postimage. |
| */ |
| fixed_buf = strbuf_detach(&fixed, &fixed_len); |
| if (postlen < postimage->len) |
| postlen = 0; |
| update_pre_post_images(preimage, postimage, |
| fixed_buf, fixed_len, postlen); |
| return 1; |
| |
| unmatch_exit: |
| strbuf_release(&fixed); |
| return 0; |
| } |
| |
| static int find_pos(struct apply_state *state, |
| struct image *img, |
| struct image *preimage, |
| struct image *postimage, |
| int line, |
| unsigned ws_rule, |
| int match_beginning, int match_end) |
| { |
| int i; |
| unsigned long backwards, forwards, current; |
| int backwards_lno, forwards_lno, current_lno; |
| |
| /* |
| * When running with --allow-overlap, it is possible that a hunk is |
| * seen that pretends to start at the beginning (but no longer does), |
| * and that *still* needs to match the end. So trust `match_end` more |
| * than `match_beginning`. |
| */ |
| if (state->allow_overlap && match_beginning && match_end && |
| img->nr - preimage->nr != 0) |
| match_beginning = 0; |
| |
| /* |
| * If match_beginning or match_end is specified, there is no |
| * point starting from a wrong line that will never match and |
| * wander around and wait for a match at the specified end. |
| */ |
| if (match_beginning) |
| line = 0; |
| else if (match_end) |
| line = img->nr - preimage->nr; |
| |
| /* |
| * Because the comparison is unsigned, the following test |
| * will also take care of a negative line number that can |
| * result when match_end and preimage is larger than the target. |
| */ |
| if ((size_t) line > img->nr) |
| line = img->nr; |
| |
| current = 0; |
| for (i = 0; i < line; i++) |
| current += img->line[i].len; |
| |
| /* |
| * There's probably some smart way to do this, but I'll leave |
| * that to the smart and beautiful people. I'm simple and stupid. |
| */ |
| backwards = current; |
| backwards_lno = line; |
| forwards = current; |
| forwards_lno = line; |
| current_lno = line; |
| |
| for (i = 0; ; i++) { |
| if (match_fragment(state, img, preimage, postimage, |
| current, current_lno, ws_rule, |
| match_beginning, match_end)) |
| return current_lno; |
| |
| again: |
| if (backwards_lno == 0 && forwards_lno == img->nr) |
| break; |
| |
| if (i & 1) { |
| if (backwards_lno == 0) { |
| i++; |
| goto again; |
| } |
| backwards_lno--; |
| backwards -= img->line[backwards_lno].len; |
| current = backwards; |
| current_lno = backwards_lno; |
| } else { |
| if (forwards_lno == img->nr) { |
| i++; |
| goto again; |
| } |
| forwards += img->line[forwards_lno].len; |
| forwards_lno++; |
| current = forwards; |
| current_lno = forwards_lno; |
| } |
| |
| } |
| return -1; |
| } |
| |
| static void remove_first_line(struct image *img) |
| { |
| img->buf += img->line[0].len; |
| img->len -= img->line[0].len; |
| img->line++; |
| img->nr--; |
| } |
| |
| static void remove_last_line(struct image *img) |
| { |
| img->len -= img->line[--img->nr].len; |
| } |
| |
| /* |
| * The change from "preimage" and "postimage" has been found to |
| * apply at applied_pos (counts in line numbers) in "img". |
| * Update "img" to remove "preimage" and replace it with "postimage". |
| */ |
| static void update_image(struct apply_state *state, |
| struct image *img, |
| int applied_pos, |
| struct image *preimage, |
| struct image *postimage) |
| { |
| /* |
| * remove the copy of preimage at offset in img |
| * and replace it with postimage |
| */ |
| int i, nr; |
| size_t remove_count, insert_count, applied_at = 0; |
| char *result; |
| int preimage_limit; |
| |
| /* |
| * If we are removing blank lines at the end of img, |
| * the preimage may extend beyond the end. |
| * If that is the case, we must be careful only to |
| * remove the part of the preimage that falls within |
| * the boundaries of img. Initialize preimage_limit |
| * to the number of lines in the preimage that falls |
| * within the boundaries. |
| */ |
| preimage_limit = preimage->nr; |
| if (preimage_limit > img->nr - applied_pos) |
| preimage_limit = img->nr - applied_pos; |
| |
| for (i = 0; i < applied_pos; i++) |
| applied_at += img->line[i].len; |
| |
| remove_count = 0; |
| for (i = 0; i < preimage_limit; i++) |
| remove_count += img->line[applied_pos + i].len; |
| insert_count = postimage->len; |
| |
| /* Adjust the contents */ |
| result = xmalloc(st_add3(st_sub(img->len, remove_count), insert_count, 1)); |
| memcpy(result, img->buf, applied_at); |
| memcpy(result + applied_at, postimage->buf, postimage->len); |
| memcpy(result + applied_at + postimage->len, |
| img->buf + (applied_at + remove_count), |
| img->len - (applied_at + remove_count)); |
| free(img->buf); |
| img->buf = result; |
| img->len += insert_count - remove_count; |
| result[img->len] = '\0'; |
| |
| /* Adjust the line table */ |
| nr = img->nr + postimage->nr - preimage_limit; |
| if (preimage_limit < postimage->nr) { |
| /* |
| * NOTE: this knows that we never call remove_first_line() |
| * on anything other than pre/post image. |
| */ |
| REALLOC_ARRAY(img->line, nr); |
| img->line_allocated = img->line; |
| } |
| if (preimage_limit != postimage->nr) |
| MOVE_ARRAY(img->line + applied_pos + postimage->nr, |
| img->line + applied_pos + preimage_limit, |
| img->nr - (applied_pos + preimage_limit)); |
| COPY_ARRAY(img->line + applied_pos, postimage->line, postimage->nr); |
| if (!state->allow_overlap) |
| for (i = 0; i < postimage->nr; i++) |
| img->line[applied_pos + i].flag |= LINE_PATCHED; |
| img->nr = nr; |
| } |
| |
| /* |
| * Use the patch-hunk text in "frag" to prepare two images (preimage and |
| * postimage) for the hunk. Find lines that match "preimage" in "img" and |
| * replace the part of "img" with "postimage" text. |
| */ |
| static int apply_one_fragment(struct apply_state *state, |
| struct image *img, struct fragment *frag, |
| int inaccurate_eof, unsigned ws_rule, |
| int nth_fragment) |
| { |
| int match_beginning, match_end; |
| const char *patch = frag->patch; |
| int size = frag->size; |
| char *old, *oldlines; |
| struct strbuf newlines; |
| int new_blank_lines_at_end = 0; |
| int found_new_blank_lines_at_end = 0; |
| int hunk_linenr = frag->linenr; |
| unsigned long leading, trailing; |
| int pos, applied_pos; |
| struct image preimage; |
| struct image postimage; |
| |
| memset(&preimage, 0, sizeof(preimage)); |
| memset(&postimage, 0, sizeof(postimage)); |
| oldlines = xmalloc(size); |
| strbuf_init(&newlines, size); |
| |
| old = oldlines; |
| while (size > 0) { |
| char first; |
| int len = linelen(patch, size); |
| int plen; |
| int added_blank_line = 0; |
| int is_blank_context = 0; |
| size_t start; |
| |
| if (!len) |
| break; |
| |
| /* |
| * "plen" is how much of the line we should use for |
| * the actual patch data. Normally we just remove the |
| * first character on the line, but if the line is |
| * followed by "\ No newline", then we also remove the |
| * last one (which is the newline, of course). |
| */ |
| plen = len - 1; |
| if (len < size && patch[len] == '\\') |
| plen--; |
| first = *patch; |
| if (state->apply_in_reverse) { |
| if (first == '-') |
| first = '+'; |
| else if (first == '+') |
| first = '-'; |
| } |
| |
| switch (first) { |
| case '\n': |
| /* Newer GNU diff, empty context line */ |
| if (plen < 0) |
| /* ... followed by '\No newline'; nothing */ |
| break; |
| *old++ = '\n'; |
| strbuf_addch(&newlines, '\n'); |
| add_line_info(&preimage, "\n", 1, LINE_COMMON); |
| add_line_info(&postimage, "\n", 1, LINE_COMMON); |
| is_blank_context = 1; |
| break; |
| case ' ': |
| if (plen && (ws_rule & WS_BLANK_AT_EOF) && |
| ws_blank_line(patch + 1, plen)) |
| is_blank_context = 1; |
| /* fallthrough */ |
| case '-': |
| memcpy(old, patch + 1, plen); |
| add_line_info(&preimage, old, plen, |
| (first == ' ' ? LINE_COMMON : 0)); |
| old += plen; |
| if (first == '-') |
| break; |
| /* fallthrough */ |
| case '+': |
| /* --no-add does not add new lines */ |
| if (first == '+' && state->no_add) |
| break; |
| |
| start = newlines.len; |
| if (first != '+' || |
| !state->whitespace_error || |
| state->ws_error_action != correct_ws_error) { |
| strbuf_add(&newlines, patch + 1, plen); |
| } |
| else { |
| ws_fix_copy(&newlines, patch + 1, plen, ws_rule, &state->applied_after_fixing_ws); |
| } |
| |