| #include "cache.h" |
| #include "attr.h" |
| #include "run-command.h" |
| #include "quote.h" |
| #include "sigchain.h" |
| #include "pkt-line.h" |
| |
| /* |
| * convert.c - convert a file when checking it out and checking it in. |
| * |
| * This should use the pathname to decide on whether it wants to do some |
| * more interesting conversions (automatic gzip/unzip, general format |
| * conversions etc etc), but by default it just does automatic CRLF<->LF |
| * translation when the "text" attribute or "auto_crlf" option is set. |
| */ |
| |
| /* Stat bits: When BIN is set, the txt bits are unset */ |
| #define CONVERT_STAT_BITS_TXT_LF 0x1 |
| #define CONVERT_STAT_BITS_TXT_CRLF 0x2 |
| #define CONVERT_STAT_BITS_BIN 0x4 |
| |
| enum crlf_action { |
| CRLF_UNDEFINED, |
| CRLF_BINARY, |
| CRLF_TEXT, |
| CRLF_TEXT_INPUT, |
| CRLF_TEXT_CRLF, |
| CRLF_AUTO, |
| CRLF_AUTO_INPUT, |
| CRLF_AUTO_CRLF |
| }; |
| |
| struct text_stat { |
| /* NUL, CR, LF and CRLF counts */ |
| unsigned nul, lonecr, lonelf, crlf; |
| |
| /* These are just approximations! */ |
| unsigned printable, nonprintable; |
| }; |
| |
| static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats) |
| { |
| unsigned long i; |
| |
| memset(stats, 0, sizeof(*stats)); |
| |
| for (i = 0; i < size; i++) { |
| unsigned char c = buf[i]; |
| if (c == '\r') { |
| if (i+1 < size && buf[i+1] == '\n') { |
| stats->crlf++; |
| i++; |
| } else |
| stats->lonecr++; |
| continue; |
| } |
| if (c == '\n') { |
| stats->lonelf++; |
| continue; |
| } |
| if (c == 127) |
| /* DEL */ |
| stats->nonprintable++; |
| else if (c < 32) { |
| switch (c) { |
| /* BS, HT, ESC and FF */ |
| case '\b': case '\t': case '\033': case '\014': |
| stats->printable++; |
| break; |
| case 0: |
| stats->nul++; |
| /* fall through */ |
| default: |
| stats->nonprintable++; |
| } |
| } |
| else |
| stats->printable++; |
| } |
| |
| /* If file ends with EOF then don't count this EOF as non-printable. */ |
| if (size >= 1 && buf[size-1] == '\032') |
| stats->nonprintable--; |
| } |
| |
| /* |
| * The same heuristics as diff.c::mmfile_is_binary() |
| * We treat files with bare CR as binary |
| */ |
| static int convert_is_binary(unsigned long size, const struct text_stat *stats) |
| { |
| if (stats->lonecr) |
| return 1; |
| if (stats->nul) |
| return 1; |
| if ((stats->printable >> 7) < stats->nonprintable) |
| return 1; |
| return 0; |
| } |
| |
| static unsigned int gather_convert_stats(const char *data, unsigned long size) |
| { |
| struct text_stat stats; |
| int ret = 0; |
| if (!data || !size) |
| return 0; |
| gather_stats(data, size, &stats); |
| if (convert_is_binary(size, &stats)) |
| ret |= CONVERT_STAT_BITS_BIN; |
| if (stats.crlf) |
| ret |= CONVERT_STAT_BITS_TXT_CRLF; |
| if (stats.lonelf) |
| ret |= CONVERT_STAT_BITS_TXT_LF; |
| |
| return ret; |
| } |
| |
| static const char *gather_convert_stats_ascii(const char *data, unsigned long size) |
| { |
| unsigned int convert_stats = gather_convert_stats(data, size); |
| |
| if (convert_stats & CONVERT_STAT_BITS_BIN) |
| return "-text"; |
| switch (convert_stats) { |
| case CONVERT_STAT_BITS_TXT_LF: |
| return "lf"; |
| case CONVERT_STAT_BITS_TXT_CRLF: |
| return "crlf"; |
| case CONVERT_STAT_BITS_TXT_LF | CONVERT_STAT_BITS_TXT_CRLF: |
| return "mixed"; |
| default: |
| return "none"; |
| } |
| } |
| |
| const char *get_cached_convert_stats_ascii(const char *path) |
| { |
| const char *ret; |
| unsigned long sz; |
| void *data = read_blob_data_from_cache(path, &sz); |
| ret = gather_convert_stats_ascii(data, sz); |
| free(data); |
| return ret; |
| } |
| |
| const char *get_wt_convert_stats_ascii(const char *path) |
| { |
| const char *ret = ""; |
| struct strbuf sb = STRBUF_INIT; |
| if (strbuf_read_file(&sb, path, 0) >= 0) |
| ret = gather_convert_stats_ascii(sb.buf, sb.len); |
| strbuf_release(&sb); |
| return ret; |
| } |
| |
| static int text_eol_is_crlf(void) |
| { |
| if (auto_crlf == AUTO_CRLF_TRUE) |
| return 1; |
| else if (auto_crlf == AUTO_CRLF_INPUT) |
| return 0; |
| if (core_eol == EOL_CRLF) |
| return 1; |
| if (core_eol == EOL_UNSET && EOL_NATIVE == EOL_CRLF) |
| return 1; |
| return 0; |
| } |
| |
| static enum eol output_eol(enum crlf_action crlf_action) |
| { |
| switch (crlf_action) { |
| case CRLF_BINARY: |
| return EOL_UNSET; |
| case CRLF_TEXT_CRLF: |
| return EOL_CRLF; |
| case CRLF_TEXT_INPUT: |
| return EOL_LF; |
| case CRLF_UNDEFINED: |
| case CRLF_AUTO_CRLF: |
| return EOL_CRLF; |
| case CRLF_AUTO_INPUT: |
| return EOL_LF; |
| case CRLF_TEXT: |
| case CRLF_AUTO: |
| /* fall through */ |
| return text_eol_is_crlf() ? EOL_CRLF : EOL_LF; |
| } |
| warning("Illegal crlf_action %d\n", (int)crlf_action); |
| return core_eol; |
| } |
| |
| static void check_safe_crlf(const char *path, enum crlf_action crlf_action, |
| struct text_stat *old_stats, struct text_stat *new_stats, |
| enum safe_crlf checksafe) |
| { |
| if (old_stats->crlf && !new_stats->crlf ) { |
| /* |
| * CRLFs would not be restored by checkout |
| */ |
| if (checksafe == SAFE_CRLF_WARN) |
| warning(_("CRLF will be replaced by LF in %s.\n" |
| "The file will have its original line" |
| " endings in your working directory."), path); |
| else /* i.e. SAFE_CRLF_FAIL */ |
| die(_("CRLF would be replaced by LF in %s."), path); |
| } else if (old_stats->lonelf && !new_stats->lonelf ) { |
| /* |
| * CRLFs would be added by checkout |
| */ |
| if (checksafe == SAFE_CRLF_WARN) |
| warning(_("LF will be replaced by CRLF in %s.\n" |
| "The file will have its original line" |
| " endings in your working directory."), path); |
| else /* i.e. SAFE_CRLF_FAIL */ |
| die(_("LF would be replaced by CRLF in %s"), path); |
| } |
| } |
| |
| static int has_cr_in_index(const char *path) |
| { |
| unsigned long sz; |
| void *data; |
| int has_cr; |
| |
| data = read_blob_data_from_cache(path, &sz); |
| if (!data) |
| return 0; |
| has_cr = memchr(data, '\r', sz) != NULL; |
| free(data); |
| return has_cr; |
| } |
| |
| static int will_convert_lf_to_crlf(size_t len, struct text_stat *stats, |
| enum crlf_action crlf_action) |
| { |
| if (output_eol(crlf_action) != EOL_CRLF) |
| return 0; |
| /* No "naked" LF? Nothing to convert, regardless. */ |
| if (!stats->lonelf) |
| return 0; |
| |
| if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) { |
| /* If we have any CR or CRLF line endings, we do not touch it */ |
| /* This is the new safer autocrlf-handling */ |
| if (stats->lonecr || stats->crlf) |
| return 0; |
| |
| if (convert_is_binary(len, stats)) |
| return 0; |
| } |
| return 1; |
| |
| } |
| |
| static int crlf_to_git(const char *path, const char *src, size_t len, |
| struct strbuf *buf, |
| enum crlf_action crlf_action, enum safe_crlf checksafe) |
| { |
| struct text_stat stats; |
| char *dst; |
| int convert_crlf_into_lf; |
| |
| if (crlf_action == CRLF_BINARY || |
| (src && !len)) |
| return 0; |
| |
| /* |
| * If we are doing a dry-run and have no source buffer, there is |
| * nothing to analyze; we must assume we would convert. |
| */ |
| if (!buf && !src) |
| return 1; |
| |
| gather_stats(src, len, &stats); |
| /* Optimization: No CRLF? Nothing to convert, regardless. */ |
| convert_crlf_into_lf = !!stats.crlf; |
| |
| if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) { |
| if (convert_is_binary(len, &stats)) |
| return 0; |
| /* |
| * If the file in the index has any CR in it, do not convert. |
| * This is the new safer autocrlf handling. |
| */ |
| if (checksafe == SAFE_CRLF_RENORMALIZE) |
| checksafe = SAFE_CRLF_FALSE; |
| else if (has_cr_in_index(path)) |
| convert_crlf_into_lf = 0; |
| } |
| if (checksafe && len) { |
| struct text_stat new_stats; |
| memcpy(&new_stats, &stats, sizeof(new_stats)); |
| /* simulate "git add" */ |
| if (convert_crlf_into_lf) { |
| new_stats.lonelf += new_stats.crlf; |
| new_stats.crlf = 0; |
| } |
| /* simulate "git checkout" */ |
| if (will_convert_lf_to_crlf(len, &new_stats, crlf_action)) { |
| new_stats.crlf += new_stats.lonelf; |
| new_stats.lonelf = 0; |
| } |
| check_safe_crlf(path, crlf_action, &stats, &new_stats, checksafe); |
| } |
| if (!convert_crlf_into_lf) |
| return 0; |
| |
| /* |
| * At this point all of our source analysis is done, and we are sure we |
| * would convert. If we are in dry-run mode, we can give an answer. |
| */ |
| if (!buf) |
| return 1; |
| |
| /* only grow if not in place */ |
| if (strbuf_avail(buf) + buf->len < len) |
| strbuf_grow(buf, len - buf->len); |
| dst = buf->buf; |
| if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) { |
| /* |
| * If we guessed, we already know we rejected a file with |
| * lone CR, and we can strip a CR without looking at what |
| * follow it. |
| */ |
| do { |
| unsigned char c = *src++; |
| if (c != '\r') |
| *dst++ = c; |
| } while (--len); |
| } else { |
| do { |
| unsigned char c = *src++; |
| if (! (c == '\r' && (1 < len && *src == '\n'))) |
| *dst++ = c; |
| } while (--len); |
| } |
| strbuf_setlen(buf, dst - buf->buf); |
| return 1; |
| } |
| |
| static int crlf_to_worktree(const char *path, const char *src, size_t len, |
| struct strbuf *buf, enum crlf_action crlf_action) |
| { |
| char *to_free = NULL; |
| struct text_stat stats; |
| |
| if (!len || output_eol(crlf_action) != EOL_CRLF) |
| return 0; |
| |
| gather_stats(src, len, &stats); |
| if (!will_convert_lf_to_crlf(len, &stats, crlf_action)) |
| return 0; |
| |
| /* are we "faking" in place editing ? */ |
| if (src == buf->buf) |
| to_free = strbuf_detach(buf, NULL); |
| |
| strbuf_grow(buf, len + stats.lonelf); |
| for (;;) { |
| const char *nl = memchr(src, '\n', len); |
| if (!nl) |
| break; |
| if (nl > src && nl[-1] == '\r') { |
| strbuf_add(buf, src, nl + 1 - src); |
| } else { |
| strbuf_add(buf, src, nl - src); |
| strbuf_addstr(buf, "\r\n"); |
| } |
| len -= nl + 1 - src; |
| src = nl + 1; |
| } |
| strbuf_add(buf, src, len); |
| |
| free(to_free); |
| return 1; |
| } |
| |
| struct filter_params { |
| const char *src; |
| unsigned long size; |
| int fd; |
| const char *cmd; |
| const char *path; |
| }; |
| |
| static int filter_buffer_or_fd(int in, int out, void *data) |
| { |
| /* |
| * Spawn cmd and feed the buffer contents through its stdin. |
| */ |
| struct child_process child_process = CHILD_PROCESS_INIT; |
| struct filter_params *params = (struct filter_params *)data; |
| int write_err, status; |
| const char *argv[] = { NULL, NULL }; |
| |
| /* apply % substitution to cmd */ |
| struct strbuf cmd = STRBUF_INIT; |
| struct strbuf path = STRBUF_INIT; |
| struct strbuf_expand_dict_entry dict[] = { |
| { "f", NULL, }, |
| { NULL, NULL, }, |
| }; |
| |
| /* quote the path to preserve spaces, etc. */ |
| sq_quote_buf(&path, params->path); |
| dict[0].value = path.buf; |
| |
| /* expand all %f with the quoted path */ |
| strbuf_expand(&cmd, params->cmd, strbuf_expand_dict_cb, &dict); |
| strbuf_release(&path); |
| |
| argv[0] = cmd.buf; |
| |
| child_process.argv = argv; |
| child_process.use_shell = 1; |
| child_process.in = -1; |
| child_process.out = out; |
| |
| if (start_command(&child_process)) |
| return error("cannot fork to run external filter '%s'", params->cmd); |
| |
| sigchain_push(SIGPIPE, SIG_IGN); |
| |
| if (params->src) { |
| write_err = (write_in_full(child_process.in, |
| params->src, params->size) < 0); |
| if (errno == EPIPE) |
| write_err = 0; |
| } else { |
| write_err = copy_fd(params->fd, child_process.in); |
| if (write_err == COPY_WRITE_ERROR && errno == EPIPE) |
| write_err = 0; |
| } |
| |
| if (close(child_process.in)) |
| write_err = 1; |
| if (write_err) |
| error("cannot feed the input to external filter '%s'", params->cmd); |
| |
| sigchain_pop(SIGPIPE); |
| |
| status = finish_command(&child_process); |
| if (status) |
| error("external filter '%s' failed %d", params->cmd, status); |
| |
| strbuf_release(&cmd); |
| return (write_err || status); |
| } |
| |
| static int apply_single_file_filter(const char *path, const char *src, size_t len, int fd, |
| struct strbuf *dst, const char *cmd) |
| { |
| /* |
| * Create a pipeline to have the command filter the buffer's |
| * contents. |
| * |
| * (child --> cmd) --> us |
| */ |
| int err = 0; |
| struct strbuf nbuf = STRBUF_INIT; |
| struct async async; |
| struct filter_params params; |
| |
| memset(&async, 0, sizeof(async)); |
| async.proc = filter_buffer_or_fd; |
| async.data = ¶ms; |
| async.out = -1; |
| params.src = src; |
| params.size = len; |
| params.fd = fd; |
| params.cmd = cmd; |
| params.path = path; |
| |
| fflush(NULL); |
| if (start_async(&async)) |
| return 0; /* error was already reported */ |
| |
| if (strbuf_read(&nbuf, async.out, len) < 0) { |
| err = error("read from external filter '%s' failed", cmd); |
| } |
| if (close(async.out)) { |
| err = error("read from external filter '%s' failed", cmd); |
| } |
| if (finish_async(&async)) { |
| err = error("external filter '%s' failed", cmd); |
| } |
| |
| if (!err) { |
| strbuf_swap(dst, &nbuf); |
| } |
| strbuf_release(&nbuf); |
| return !err; |
| } |
| |
| #define CAP_CLEAN (1u<<0) |
| #define CAP_SMUDGE (1u<<1) |
| |
| struct cmd2process { |
| struct hashmap_entry ent; /* must be the first member! */ |
| unsigned int supported_capabilities; |
| const char *cmd; |
| struct child_process process; |
| }; |
| |
| static int cmd_process_map_initialized; |
| static struct hashmap cmd_process_map; |
| |
| static int cmd2process_cmp(const struct cmd2process *e1, |
| const struct cmd2process *e2, |
| const void *unused) |
| { |
| return strcmp(e1->cmd, e2->cmd); |
| } |
| |
| static struct cmd2process *find_multi_file_filter_entry(struct hashmap *hashmap, const char *cmd) |
| { |
| struct cmd2process key; |
| hashmap_entry_init(&key, strhash(cmd)); |
| key.cmd = cmd; |
| return hashmap_get(hashmap, &key, NULL); |
| } |
| |
| static int packet_write_list(int fd, const char *line, ...) |
| { |
| va_list args; |
| int err; |
| va_start(args, line); |
| for (;;) { |
| if (!line) |
| break; |
| if (strlen(line) > LARGE_PACKET_DATA_MAX) |
| return -1; |
| err = packet_write_fmt_gently(fd, "%s\n", line); |
| if (err) |
| return err; |
| line = va_arg(args, const char*); |
| } |
| va_end(args); |
| return packet_flush_gently(fd); |
| } |
| |
| static void read_multi_file_filter_status(int fd, struct strbuf *status) |
| { |
| struct strbuf **pair; |
| char *line; |
| for (;;) { |
| line = packet_read_line(fd, NULL); |
| if (!line) |
| break; |
| pair = strbuf_split_str(line, '=', 2); |
| if (pair[0] && pair[0]->len && pair[1]) { |
| /* the last "status=<foo>" line wins */ |
| if (!strcmp(pair[0]->buf, "status=")) { |
| strbuf_reset(status); |
| strbuf_addbuf(status, pair[1]); |
| } |
| } |
| strbuf_list_free(pair); |
| } |
| } |
| |
| static void kill_multi_file_filter(struct hashmap *hashmap, struct cmd2process *entry) |
| { |
| if (!entry) |
| return; |
| |
| entry->process.clean_on_exit = 0; |
| kill(entry->process.pid, SIGTERM); |
| finish_command(&entry->process); |
| |
| hashmap_remove(hashmap, entry, NULL); |
| free(entry); |
| } |
| |
| static void stop_multi_file_filter(struct child_process *process) |
| { |
| sigchain_push(SIGPIPE, SIG_IGN); |
| /* Closing the pipe signals the filter to initiate a shutdown. */ |
| close(process->in); |
| close(process->out); |
| sigchain_pop(SIGPIPE); |
| /* Finish command will wait until the shutdown is complete. */ |
| finish_command(process); |
| } |
| |
| static struct cmd2process *start_multi_file_filter(struct hashmap *hashmap, const char *cmd) |
| { |
| int err; |
| struct cmd2process *entry; |
| struct child_process *process; |
| const char *argv[] = { cmd, NULL }; |
| struct string_list cap_list = STRING_LIST_INIT_NODUP; |
| char *cap_buf; |
| const char *cap_name; |
| |
| entry = xmalloc(sizeof(*entry)); |
| entry->cmd = cmd; |
| entry->supported_capabilities = 0; |
| process = &entry->process; |
| |
| child_process_init(process); |
| process->argv = argv; |
| process->use_shell = 1; |
| process->in = -1; |
| process->out = -1; |
| process->clean_on_exit = 1; |
| process->clean_on_exit_handler = stop_multi_file_filter; |
| |
| if (start_command(process)) { |
| error("cannot fork to run external filter '%s'", cmd); |
| return NULL; |
| } |
| |
| hashmap_entry_init(entry, strhash(cmd)); |
| |
| sigchain_push(SIGPIPE, SIG_IGN); |
| |
| err = packet_write_list(process->in, "git-filter-client", "version=2", NULL); |
| if (err) |
| goto done; |
| |
| err = strcmp(packet_read_line(process->out, NULL), "git-filter-server"); |
| if (err) { |
| error("external filter '%s' does not support filter protocol version 2", cmd); |
| goto done; |
| } |
| err = strcmp(packet_read_line(process->out, NULL), "version=2"); |
| if (err) |
| goto done; |
| err = packet_read_line(process->out, NULL) != NULL; |
| if (err) |
| goto done; |
| |
| err = packet_write_list(process->in, "capability=clean", "capability=smudge", NULL); |
| |
| for (;;) { |
| cap_buf = packet_read_line(process->out, NULL); |
| if (!cap_buf) |
| break; |
| string_list_split_in_place(&cap_list, cap_buf, '=', 1); |
| |
| if (cap_list.nr != 2 || strcmp(cap_list.items[0].string, "capability")) |
| continue; |
| |
| cap_name = cap_list.items[1].string; |
| if (!strcmp(cap_name, "clean")) { |
| entry->supported_capabilities |= CAP_CLEAN; |
| } else if (!strcmp(cap_name, "smudge")) { |
| entry->supported_capabilities |= CAP_SMUDGE; |
| } else { |
| warning( |
| "external filter '%s' requested unsupported filter capability '%s'", |
| cmd, cap_name |
| ); |
| } |
| |
| string_list_clear(&cap_list, 0); |
| } |
| |
| done: |
| sigchain_pop(SIGPIPE); |
| |
| if (err || errno == EPIPE) { |
| error("initialization for external filter '%s' failed", cmd); |
| kill_multi_file_filter(hashmap, entry); |
| return NULL; |
| } |
| |
| hashmap_add(hashmap, entry); |
| return entry; |
| } |
| |
| static int apply_multi_file_filter(const char *path, const char *src, size_t len, |
| int fd, struct strbuf *dst, const char *cmd, |
| const unsigned int wanted_capability) |
| { |
| int err; |
| struct cmd2process *entry; |
| struct child_process *process; |
| struct strbuf nbuf = STRBUF_INIT; |
| struct strbuf filter_status = STRBUF_INIT; |
| const char *filter_type; |
| |
| if (!cmd_process_map_initialized) { |
| cmd_process_map_initialized = 1; |
| hashmap_init(&cmd_process_map, (hashmap_cmp_fn) cmd2process_cmp, 0); |
| entry = NULL; |
| } else { |
| entry = find_multi_file_filter_entry(&cmd_process_map, cmd); |
| } |
| |
| fflush(NULL); |
| |
| if (!entry) { |
| entry = start_multi_file_filter(&cmd_process_map, cmd); |
| if (!entry) |
| return 0; |
| } |
| process = &entry->process; |
| |
| if (!(wanted_capability & entry->supported_capabilities)) |
| return 0; |
| |
| if (CAP_CLEAN & wanted_capability) |
| filter_type = "clean"; |
| else if (CAP_SMUDGE & wanted_capability) |
| filter_type = "smudge"; |
| else |
| die("unexpected filter type"); |
| |
| sigchain_push(SIGPIPE, SIG_IGN); |
| |
| assert(strlen(filter_type) < LARGE_PACKET_DATA_MAX - strlen("command=\n")); |
| err = packet_write_fmt_gently(process->in, "command=%s\n", filter_type); |
| if (err) |
| goto done; |
| |
| err = strlen(path) > LARGE_PACKET_DATA_MAX - strlen("pathname=\n"); |
| if (err) { |
| error("path name too long for external filter"); |
| goto done; |
| } |
| |
| err = packet_write_fmt_gently(process->in, "pathname=%s\n", path); |
| if (err) |
| goto done; |
| |
| err = packet_flush_gently(process->in); |
| if (err) |
| goto done; |
| |
| if (fd >= 0) |
| err = write_packetized_from_fd(fd, process->in); |
| else |
| err = write_packetized_from_buf(src, len, process->in); |
| if (err) |
| goto done; |
| |
| read_multi_file_filter_status(process->out, &filter_status); |
| err = strcmp(filter_status.buf, "success"); |
| if (err) |
| goto done; |
| |
| err = read_packetized_to_strbuf(process->out, &nbuf) < 0; |
| if (err) |
| goto done; |
| |
| read_multi_file_filter_status(process->out, &filter_status); |
| err = strcmp(filter_status.buf, "success"); |
| |
| done: |
| sigchain_pop(SIGPIPE); |
| |
| if (err || errno == EPIPE) { |
| if (!strcmp(filter_status.buf, "error")) { |
| /* The filter signaled a problem with the file. */ |
| } else if (!strcmp(filter_status.buf, "abort")) { |
| /* |
| * The filter signaled a permanent problem. Don't try to filter |
| * files with the same command for the lifetime of the current |
| * Git process. |
| */ |
| entry->supported_capabilities &= ~wanted_capability; |
| } else { |
| /* |
| * Something went wrong with the protocol filter. |
| * Force shutdown and restart if another blob requires filtering. |
| */ |
| error("external filter '%s' failed", cmd); |
| kill_multi_file_filter(&cmd_process_map, entry); |
| } |
| } else { |
| strbuf_swap(dst, &nbuf); |
| } |
| strbuf_release(&nbuf); |
| return !err; |
| } |
| |
| static struct convert_driver { |
| const char *name; |
| struct convert_driver *next; |
| const char *smudge; |
| const char *clean; |
| const char *process; |
| int required; |
| } *user_convert, **user_convert_tail; |
| |
| static int apply_filter(const char *path, const char *src, size_t len, |
| int fd, struct strbuf *dst, struct convert_driver *drv, |
| const unsigned int wanted_capability) |
| { |
| const char *cmd = NULL; |
| |
| if (!drv) |
| return 0; |
| |
| if (!dst) |
| return 1; |
| |
| if ((CAP_CLEAN & wanted_capability) && !drv->process && drv->clean) |
| cmd = drv->clean; |
| else if ((CAP_SMUDGE & wanted_capability) && !drv->process && drv->smudge) |
| cmd = drv->smudge; |
| |
| if (cmd && *cmd) |
| return apply_single_file_filter(path, src, len, fd, dst, cmd); |
| else if (drv->process && *drv->process) |
| return apply_multi_file_filter(path, src, len, fd, dst, drv->process, wanted_capability); |
| |
| return 0; |
| } |
| |
| static int read_convert_config(const char *var, const char *value, void *cb) |
| { |
| const char *key, *name; |
| int namelen; |
| struct convert_driver *drv; |
| |
| /* |
| * External conversion drivers are configured using |
| * "filter.<name>.variable". |
| */ |
| if (parse_config_key(var, "filter", &name, &namelen, &key) < 0 || !name) |
| return 0; |
| for (drv = user_convert; drv; drv = drv->next) |
| if (!strncmp(drv->name, name, namelen) && !drv->name[namelen]) |
| break; |
| if (!drv) { |
| drv = xcalloc(1, sizeof(struct convert_driver)); |
| drv->name = xmemdupz(name, namelen); |
| *user_convert_tail = drv; |
| user_convert_tail = &(drv->next); |
| } |
| |
| /* |
| * filter.<name>.smudge and filter.<name>.clean specifies |
| * the command line: |
| * |
| * command-line |
| * |
| * The command-line will not be interpolated in any way. |
| */ |
| |
| if (!strcmp("smudge", key)) |
| return git_config_string(&drv->smudge, var, value); |
| |
| if (!strcmp("clean", key)) |
| return git_config_string(&drv->clean, var, value); |
| |
| if (!strcmp("process", key)) |
| return git_config_string(&drv->process, var, value); |
| |
| if (!strcmp("required", key)) { |
| drv->required = git_config_bool(var, value); |
| return 0; |
| } |
| |
| return 0; |
| } |
| |
| static int count_ident(const char *cp, unsigned long size) |
| { |
| /* |
| * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$" |
| */ |
| int cnt = 0; |
| char ch; |
| |
| while (size) { |
| ch = *cp++; |
| size--; |
| if (ch != '$') |
| continue; |
| if (size < 3) |
| break; |
| if (memcmp("Id", cp, 2)) |
| continue; |
| ch = cp[2]; |
| cp += 3; |
| size -= 3; |
| if (ch == '$') |
| cnt++; /* $Id$ */ |
| if (ch != ':') |
| continue; |
| |
| /* |
| * "$Id: ... "; scan up to the closing dollar sign and discard. |
| */ |
| while (size) { |
| ch = *cp++; |
| size--; |
| if (ch == '$') { |
| cnt++; |
| break; |
| } |
| if (ch == '\n') |
| break; |
| } |
| } |
| return cnt; |
| } |
| |
| static int ident_to_git(const char *path, const char *src, size_t len, |
| struct strbuf *buf, int ident) |
| { |
| char *dst, *dollar; |
| |
| if (!ident || (src && !count_ident(src, len))) |
| return 0; |
| |
| if (!buf) |
| return 1; |
| |
| /* only grow if not in place */ |
| if (strbuf_avail(buf) + buf->len < len) |
| strbuf_grow(buf, len - buf->len); |
| dst = buf->buf; |
| for (;;) { |
| dollar = memchr(src, '$', len); |
| if (!dollar) |
| break; |
| memmove(dst, src, dollar + 1 - src); |
| dst += dollar + 1 - src; |
| len -= dollar + 1 - src; |
| src = dollar + 1; |
| |
| if (len > 3 && !memcmp(src, "Id:", 3)) { |
| dollar = memchr(src + 3, '$', len - 3); |
| if (!dollar) |
| break; |
| if (memchr(src + 3, '\n', dollar - src - 3)) { |
| /* Line break before the next dollar. */ |
| continue; |
| } |
| |
| memcpy(dst, "Id$", 3); |
| dst += 3; |
| len -= dollar + 1 - src; |
| src = dollar + 1; |
| } |
| } |
| memmove(dst, src, len); |
| strbuf_setlen(buf, dst + len - buf->buf); |
| return 1; |
| } |
| |
| static int ident_to_worktree(const char *path, const char *src, size_t len, |
| struct strbuf *buf, int ident) |
| { |
| unsigned char sha1[20]; |
| char *to_free = NULL, *dollar, *spc; |
| int cnt; |
| |
| if (!ident) |
| return 0; |
| |
| cnt = count_ident(src, len); |
| if (!cnt) |
| return 0; |
| |
| /* are we "faking" in place editing ? */ |
| if (src == buf->buf) |
| to_free = strbuf_detach(buf, NULL); |
| hash_sha1_file(src, len, "blob", sha1); |
| |
| strbuf_grow(buf, len + cnt * 43); |
| for (;;) { |
| /* step 1: run to the next '$' */ |
| dollar = memchr(src, '$', len); |
| if (!dollar) |
| break; |
| strbuf_add(buf, src, dollar + 1 - src); |
| len -= dollar + 1 - src; |
| src = dollar + 1; |
| |
| /* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */ |
| if (len < 3 || memcmp("Id", src, 2)) |
| continue; |
| |
| /* step 3: skip over Id$ or Id:xxxxx$ */ |
| if (src[2] == '$') { |
| src += 3; |
| len -= 3; |
| } else if (src[2] == ':') { |
| /* |
| * It's possible that an expanded Id has crept its way into the |
| * repository, we cope with that by stripping the expansion out. |
| * This is probably not a good idea, since it will cause changes |
| * on checkout, which won't go away by stash, but let's keep it |
| * for git-style ids. |
| */ |
| dollar = memchr(src + 3, '$', len - 3); |
| if (!dollar) { |
| /* incomplete keyword, no more '$', so just quit the loop */ |
| break; |
| } |
| |
| if (memchr(src + 3, '\n', dollar - src - 3)) { |
| /* Line break before the next dollar. */ |
| continue; |
| } |
| |
| spc = memchr(src + 4, ' ', dollar - src - 4); |
| if (spc && spc < dollar-1) { |
| /* There are spaces in unexpected places. |
| * This is probably an id from some other |
| * versioning system. Keep it for now. |
| */ |
| continue; |
| } |
| |
| len -= dollar + 1 - src; |
| src = dollar + 1; |
| } else { |
| /* it wasn't a "Id$" or "Id:xxxx$" */ |
| continue; |
| } |
| |
| /* step 4: substitute */ |
| strbuf_addstr(buf, "Id: "); |
| strbuf_add(buf, sha1_to_hex(sha1), 40); |
| strbuf_addstr(buf, " $"); |
| } |
| strbuf_add(buf, src, len); |
| |
| free(to_free); |
| return 1; |
| } |
| |
| static enum crlf_action git_path_check_crlf(struct git_attr_check *check) |
| { |
| const char *value = check->value; |
| |
| if (ATTR_TRUE(value)) |
| return CRLF_TEXT; |
| else if (ATTR_FALSE(value)) |
| return CRLF_BINARY; |
| else if (ATTR_UNSET(value)) |
| ; |
| else if (!strcmp(value, "input")) |
| return CRLF_TEXT_INPUT; |
| else if (!strcmp(value, "auto")) |
| return CRLF_AUTO; |
| return CRLF_UNDEFINED; |
| } |
| |
| static enum eol git_path_check_eol(struct git_attr_check *check) |
| { |
| const char *value = check->value; |
| |
| if (ATTR_UNSET(value)) |
| ; |
| else if (!strcmp(value, "lf")) |
| return EOL_LF; |
| else if (!strcmp(value, "crlf")) |
| return EOL_CRLF; |
| return EOL_UNSET; |
| } |
| |
| static struct convert_driver *git_path_check_convert(struct git_attr_check *check) |
| { |
| const char *value = check->value; |
| struct convert_driver *drv; |
| |
| if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value)) |
| return NULL; |
| for (drv = user_convert; drv; drv = drv->next) |
| if (!strcmp(value, drv->name)) |
| return drv; |
| return NULL; |
| } |
| |
| static int git_path_check_ident(struct git_attr_check *check) |
| { |
| const char *value = check->value; |
| |
| return !!ATTR_TRUE(value); |
| } |
| |
| struct conv_attrs { |
| struct convert_driver *drv; |
| enum crlf_action attr_action; /* What attr says */ |
| enum crlf_action crlf_action; /* When no attr is set, use core.autocrlf */ |
| int ident; |
| }; |
| |
| static const char *conv_attr_name[] = { |
| "crlf", "ident", "filter", "eol", "text", |
| }; |
| #define NUM_CONV_ATTRS ARRAY_SIZE(conv_attr_name) |
| |
| static void convert_attrs(struct conv_attrs *ca, const char *path) |
| { |
| int i; |
| static struct git_attr_check ccheck[NUM_CONV_ATTRS]; |
| |
| if (!ccheck[0].attr) { |
| for (i = 0; i < NUM_CONV_ATTRS; i++) |
| ccheck[i].attr = git_attr(conv_attr_name[i]); |
| user_convert_tail = &user_convert; |
| git_config(read_convert_config, NULL); |
| } |
| |
| if (!git_check_attr(path, NUM_CONV_ATTRS, ccheck)) { |
| ca->crlf_action = git_path_check_crlf(ccheck + 4); |
| if (ca->crlf_action == CRLF_UNDEFINED) |
| ca->crlf_action = git_path_check_crlf(ccheck + 0); |
| ca->attr_action = ca->crlf_action; |
| ca->ident = git_path_check_ident(ccheck + 1); |
| ca->drv = git_path_check_convert(ccheck + 2); |
| if (ca->crlf_action != CRLF_BINARY) { |
| enum eol eol_attr = git_path_check_eol(ccheck + 3); |
| if (ca->crlf_action == CRLF_AUTO && eol_attr == EOL_LF) |
| ca->crlf_action = CRLF_AUTO_INPUT; |
| else if (ca->crlf_action == CRLF_AUTO && eol_attr == EOL_CRLF) |
| ca->crlf_action = CRLF_AUTO_CRLF; |
| else if (eol_attr == EOL_LF) |
| ca->crlf_action = CRLF_TEXT_INPUT; |
| else if (eol_attr == EOL_CRLF) |
| ca->crlf_action = CRLF_TEXT_CRLF; |
| } |
| ca->attr_action = ca->crlf_action; |
| } else { |
| ca->drv = NULL; |
| ca->crlf_action = CRLF_UNDEFINED; |
| ca->ident = 0; |
| } |
| if (ca->crlf_action == CRLF_TEXT) |
| ca->crlf_action = text_eol_is_crlf() ? CRLF_TEXT_CRLF : CRLF_TEXT_INPUT; |
| if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_FALSE) |
| ca->crlf_action = CRLF_BINARY; |
| if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_TRUE) |
| ca->crlf_action = CRLF_AUTO_CRLF; |
| if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_INPUT) |
| ca->crlf_action = CRLF_AUTO_INPUT; |
| } |
| |
| int would_convert_to_git_filter_fd(const char *path) |
| { |
| struct conv_attrs ca; |
| |
| convert_attrs(&ca, path); |
| if (!ca.drv) |
| return 0; |
| |
| /* |
| * Apply a filter to an fd only if the filter is required to succeed. |
| * We must die if the filter fails, because the original data before |
| * filtering is not available. |
| */ |
| if (!ca.drv->required) |
| return 0; |
| |
| return apply_filter(path, NULL, 0, -1, NULL, ca.drv, CAP_CLEAN); |
| } |
| |
| const char *get_convert_attr_ascii(const char *path) |
| { |
| struct conv_attrs ca; |
| |
| convert_attrs(&ca, path); |
| switch (ca.attr_action) { |
| case CRLF_UNDEFINED: |
| return ""; |
| case CRLF_BINARY: |
| return "-text"; |
| case CRLF_TEXT: |
| return "text"; |
| case CRLF_TEXT_INPUT: |
| return "text eol=lf"; |
| case CRLF_TEXT_CRLF: |
| return "text eol=crlf"; |
| case CRLF_AUTO: |
| return "text=auto"; |
| case CRLF_AUTO_CRLF: |
| return "text=auto eol=crlf"; |
| case CRLF_AUTO_INPUT: |
| return "text=auto eol=lf"; |
| } |
| return ""; |
| } |
| |
| int convert_to_git(const char *path, const char *src, size_t len, |
| struct strbuf *dst, enum safe_crlf checksafe) |
| { |
| int ret = 0; |
| struct conv_attrs ca; |
| |
| convert_attrs(&ca, path); |
| |
| ret |= apply_filter(path, src, len, -1, dst, ca.drv, CAP_CLEAN); |
| if (!ret && ca.drv && ca.drv->required) |
| die("%s: clean filter '%s' failed", path, ca.drv->name); |
| |
| if (ret && dst) { |
| src = dst->buf; |
| len = dst->len; |
| } |
| ret |= crlf_to_git(path, src, len, dst, ca.crlf_action, checksafe); |
| if (ret && dst) { |
| src = dst->buf; |
| len = dst->len; |
| } |
| return ret | ident_to_git(path, src, len, dst, ca.ident); |
| } |
| |
| void convert_to_git_filter_fd(const char *path, int fd, struct strbuf *dst, |
| enum safe_crlf checksafe) |
| { |
| struct conv_attrs ca; |
| convert_attrs(&ca, path); |
| |
| assert(ca.drv); |
| assert(ca.drv->clean || ca.drv->process); |
| |
| if (!apply_filter(path, NULL, 0, fd, dst, ca.drv, CAP_CLEAN)) |
| die("%s: clean filter '%s' failed", path, ca.drv->name); |
| |
| crlf_to_git(path, dst->buf, dst->len, dst, ca.crlf_action, checksafe); |
| ident_to_git(path, dst->buf, dst->len, dst, ca.ident); |
| } |
| |
| static int convert_to_working_tree_internal(const char *path, const char *src, |
| size_t len, struct strbuf *dst, |
| int normalizing) |
| { |
| int ret = 0, ret_filter = 0; |
| struct conv_attrs ca; |
| |
| convert_attrs(&ca, path); |
| |
| ret |= ident_to_worktree(path, src, len, dst, ca.ident); |
| if (ret) { |
| src = dst->buf; |
| len = dst->len; |
| } |
| /* |
| * CRLF conversion can be skipped if normalizing, unless there |
| * is a smudge or process filter (even if the process filter doesn't |
| * support smudge). The filters might expect CRLFs. |
| */ |
| if ((ca.drv && (ca.drv->smudge || ca.drv->process)) || !normalizing) { |
| ret |= crlf_to_worktree(path, src, len, dst, ca.crlf_action); |
| if (ret) { |
| src = dst->buf; |
| len = dst->len; |
| } |
| } |
| |
| ret_filter = apply_filter(path, src, len, -1, dst, ca.drv, CAP_SMUDGE); |
| if (!ret_filter && ca.drv && ca.drv->required) |
| die("%s: smudge filter %s failed", path, ca.drv->name); |
| |
| return ret | ret_filter; |
| } |
| |
| int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst) |
| { |
| return convert_to_working_tree_internal(path, src, len, dst, 0); |
| } |
| |
| int renormalize_buffer(const char *path, const char *src, size_t len, struct strbuf *dst) |
| { |
| int ret = convert_to_working_tree_internal(path, src, len, dst, 1); |
| if (ret) { |
| src = dst->buf; |
| len = dst->len; |
| } |
| return ret | convert_to_git(path, src, len, dst, SAFE_CRLF_RENORMALIZE); |
| } |
| |
| /***************************************************************** |
| * |
| * Streaming conversion support |
| * |
| *****************************************************************/ |
| |
| typedef int (*filter_fn)(struct stream_filter *, |
| const char *input, size_t *isize_p, |
| char *output, size_t *osize_p); |
| typedef void (*free_fn)(struct stream_filter *); |
| |
| struct stream_filter_vtbl { |
| filter_fn filter; |
| free_fn free; |
| }; |
| |
| struct stream_filter { |
| struct stream_filter_vtbl *vtbl; |
| }; |
| |
| static int null_filter_fn(struct stream_filter *filter, |
| const char *input, size_t *isize_p, |
| char *output, size_t *osize_p) |
| { |
| size_t count; |
| |
| if (!input) |
| return 0; /* we do not keep any states */ |
| count = *isize_p; |
| if (*osize_p < count) |
| count = *osize_p; |
| if (count) { |
| memmove(output, input, count); |
| *isize_p -= count; |
| *osize_p -= count; |
| } |
| return 0; |
| } |
| |
| static void null_free_fn(struct stream_filter *filter) |
| { |
| ; /* nothing -- null instances are shared */ |
| } |
| |
| static struct stream_filter_vtbl null_vtbl = { |
| null_filter_fn, |
| null_free_fn, |
| }; |
| |
| static struct stream_filter null_filter_singleton = { |
| &null_vtbl, |
| }; |
| |
| int is_null_stream_filter(struct stream_filter *filter) |
| { |
| return filter == &null_filter_singleton; |
| } |
| |
| |
| /* |
| * LF-to-CRLF filter |
| */ |
| |
| struct lf_to_crlf_filter { |
| struct stream_filter filter; |
| unsigned has_held:1; |
| char held; |
| }; |
| |
| static int lf_to_crlf_filter_fn(struct stream_filter *filter, |
| const char *input, size_t *isize_p, |
| char *output, size_t *osize_p) |
| { |
| size_t count, o = 0; |
| struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter; |
| |
| /* |
| * We may be holding onto the CR to see if it is followed by a |
| * LF, in which case we would need to go to the main loop. |
| * Otherwise, just emit it to the output stream. |
| */ |
| if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) { |
| output[o++] = lf_to_crlf->held; |
| lf_to_crlf->has_held = 0; |
| } |
| |
| /* We are told to drain */ |
| if (!input) { |
| *osize_p -= o; |
| return 0; |
| } |
| |
| count = *isize_p; |
| if (count || lf_to_crlf->has_held) { |
| size_t i; |
| int was_cr = 0; |
| |
| if (lf_to_crlf->has_held) { |
| was_cr = 1; |
| lf_to_crlf->has_held = 0; |
| } |
| |
| for (i = 0; o < *osize_p && i < count; i++) { |
| char ch = input[i]; |
| |
| if (ch == '\n') { |
| output[o++] = '\r'; |
| } else if (was_cr) { |
| /* |
| * Previous round saw CR and it is not followed |
| * by a LF; emit the CR before processing the |
| * current character. |
| */ |
| output[o++] = '\r'; |
| } |
| |
| /* |
| * We may have consumed the last output slot, |
| * in which case we need to break out of this |
| * loop; hold the current character before |
| * returning. |
| */ |
| if (*osize_p <= o) { |
| lf_to_crlf->has_held = 1; |
| lf_to_crlf->held = ch; |
| continue; /* break but increment i */ |
| } |
| |
| if (ch == '\r') { |
| was_cr = 1; |
| continue; |
| } |
| |
| was_cr = 0; |
| output[o++] = ch; |
| } |
| |
| *osize_p -= o; |
| *isize_p -= i; |
| |
| if (!lf_to_crlf->has_held && was_cr) { |
| lf_to_crlf->has_held = 1; |
| lf_to_crlf->held = '\r'; |
| } |
| } |
| return 0; |
| } |
| |
| static void lf_to_crlf_free_fn(struct stream_filter *filter) |
| { |
| free(filter); |
| } |
| |
| static struct stream_filter_vtbl lf_to_crlf_vtbl = { |
| lf_to_crlf_filter_fn, |
| lf_to_crlf_free_fn, |
| }; |
| |
| static struct stream_filter *lf_to_crlf_filter(void) |
| { |
| struct lf_to_crlf_filter *lf_to_crlf = xcalloc(1, sizeof(*lf_to_crlf)); |
| |
| lf_to_crlf->filter.vtbl = &lf_to_crlf_vtbl; |
| return (struct stream_filter *)lf_to_crlf; |
| } |
| |
| /* |
| * Cascade filter |
| */ |
| #define FILTER_BUFFER 1024 |
| struct cascade_filter { |
| struct stream_filter filter; |
| struct stream_filter *one; |
| struct stream_filter *two; |
| char buf[FILTER_BUFFER]; |
| int end, ptr; |
| }; |
| |
| static int cascade_filter_fn(struct stream_filter *filter, |
| const char *input, size_t *isize_p, |
| char *output, size_t *osize_p) |
| { |
| struct cascade_filter *cas = (struct cascade_filter *) filter; |
| size_t filled = 0; |
| size_t sz = *osize_p; |
| size_t to_feed, remaining; |
| |
| /* |
| * input -- (one) --> buf -- (two) --> output |
| */ |
| while (filled < sz) { |
| remaining = sz - filled; |
| |
| /* do we already have something to feed two with? */ |
| if (cas->ptr < cas->end) { |
| to_feed = cas->end - cas->ptr; |
| if (stream_filter(cas->two, |
| cas->buf + cas->ptr, &to_feed, |
| output + filled, &remaining)) |
| return -1; |
| cas->ptr += (cas->end - cas->ptr) - to_feed; |
| filled = sz - remaining; |
| continue; |
| } |
| |
| /* feed one from upstream and have it emit into our buffer */ |
| to_feed = input ? *isize_p : 0; |
| if (input && !to_feed) |
| break; |
| remaining = sizeof(cas->buf); |
| if (stream_filter(cas->one, |
| input, &to_feed, |
| cas->buf, &remaining)) |
| return -1; |
| cas->end = sizeof(cas->buf) - remaining; |
| cas->ptr = 0; |
| if (input) { |
| size_t fed = *isize_p - to_feed; |
| *isize_p -= fed; |
| input += fed; |
| } |
| |
| /* do we know that we drained one completely? */ |
| if (input || cas->end) |
| continue; |
| |
| /* tell two to drain; we have nothing more to give it */ |
| to_feed = 0; |
| remaining = sz - filled; |
| if (stream_filter(cas->two, |
| NULL, &to_feed, |
| output + filled, &remaining)) |
| return -1; |
| if (remaining == (sz - filled)) |
| break; /* completely drained two */ |
| filled = sz - remaining; |
| } |
| *osize_p -= filled; |
| return 0; |
| } |
| |
| static void cascade_free_fn(struct stream_filter *filter) |
| { |
| struct cascade_filter *cas = (struct cascade_filter *)filter; |
| free_stream_filter(cas->one); |
| free_stream_filter(cas->two); |
| free(filter); |
| } |
| |
| static struct stream_filter_vtbl cascade_vtbl = { |
| cascade_filter_fn, |
| cascade_free_fn, |
| }; |
| |
| static struct stream_filter *cascade_filter(struct stream_filter *one, |
| struct stream_filter *two) |
| { |
| struct cascade_filter *cascade; |
| |
| if (!one || is_null_stream_filter(one)) |
| return two; |
| if (!two || is_null_stream_filter(two)) |
| return one; |
| |
| cascade = xmalloc(sizeof(*cascade)); |
| cascade->one = one; |
| cascade->two = two; |
| cascade->end = cascade->ptr = 0; |
| cascade->filter.vtbl = &cascade_vtbl; |
| return (struct stream_filter *)cascade; |
| } |
| |
| /* |
| * ident filter |
| */ |
| #define IDENT_DRAINING (-1) |
| #define IDENT_SKIPPING (-2) |
| struct ident_filter { |
| struct stream_filter filter; |
| struct strbuf left; |
| int state; |
| char ident[45]; /* ": x40 $" */ |
| }; |
| |
| static int is_foreign_ident(const char *str) |
| { |
| int i; |
| |
| if (!skip_prefix(str, "$Id: ", &str)) |
| return 0; |
| for (i = 0; str[i]; i++) { |
| if (isspace(str[i]) && str[i+1] != '$') |
| return 1; |
| } |
| return 0; |
| } |
| |
| static void ident_drain(struct ident_filter *ident, char **output_p, size_t *osize_p) |
| { |
| size_t to_drain = ident->left.len; |
| |
| if (*osize_p < to_drain) |
| to_drain = *osize_p; |
| if (to_drain) { |
| memcpy(*output_p, ident->left.buf, to_drain); |
| strbuf_remove(&ident->left, 0, to_drain); |
| *output_p += to_drain; |
| *osize_p -= to_drain; |
| } |
| if (!ident->left.len) |
| ident->state = 0; |
| } |
| |
| static int ident_filter_fn(struct stream_filter *filter, |
| const char *input, size_t *isize_p, |
| char *output, size_t *osize_p) |
| { |
| struct ident_filter *ident = (struct ident_filter *)filter; |
| static const char head[] = "$Id"; |
| |
| if (!input) { |
| /* drain upon eof */ |
| switch (ident->state) { |
| default: |
| strbuf_add(&ident->left, head, ident->state); |
| case IDENT_SKIPPING: |
| /* fallthru */ |
| case IDENT_DRAINING: |
| ident_drain(ident, &output, osize_p); |
| } |
| return 0; |
| } |
| |
| while (*isize_p || (ident->state == IDENT_DRAINING)) { |
| int ch; |
| |
| if (ident->state == IDENT_DRAINING) { |
| ident_drain(ident, &output, osize_p); |
| if (!*osize_p) |
| break; |
| continue; |
| } |
| |
| ch = *(input++); |
| (*isize_p)--; |
| |
| if (ident->state == IDENT_SKIPPING) { |
| /* |
| * Skipping until '$' or LF, but keeping them |
| * in case it is a foreign ident. |
| */ |
| strbuf_addch(&ident->left, ch); |
| if (ch != '\n' && ch != '$') |
| continue; |
| if (ch == '$' && !is_foreign_ident(ident->left.buf)) { |
| strbuf_setlen(&ident->left, sizeof(head) - 1); |
| strbuf_addstr(&ident->left, ident->ident); |
| } |
| ident->state = IDENT_DRAINING; |
| continue; |
| } |
| |
| if (ident->state < sizeof(head) && |
| head[ident->state] == ch) { |
| ident->state++; |
| continue; |
| } |
| |
| if (ident->state) |
| strbuf_add(&ident->left, head, ident->state); |
| if (ident->state == sizeof(head) - 1) { |
| if (ch != ':' && ch != '$') { |
| strbuf_addch(&ident->left, ch); |
| ident->state = 0; |
| continue; |
| } |
| |
| if (ch == ':') { |
| strbuf_addch(&ident->left, ch); |
| ident->state = IDENT_SKIPPING; |
| } else { |
| strbuf_addstr(&ident->left, ident->ident); |
| ident->state = IDENT_DRAINING; |
| } |
| continue; |
| } |
| |
| strbuf_addch(&ident->left, ch); |
| ident->state = IDENT_DRAINING; |
| } |
| return 0; |
| } |
| |
| static void ident_free_fn(struct stream_filter *filter) |
| { |
| struct ident_filter *ident = (struct ident_filter *)filter; |
| strbuf_release(&ident->left); |
| free(filter); |
| } |
| |
| static struct stream_filter_vtbl ident_vtbl = { |
| ident_filter_fn, |
| ident_free_fn, |
| }; |
| |
| static struct stream_filter *ident_filter(const unsigned char *sha1) |
| { |
| struct ident_filter *ident = xmalloc(sizeof(*ident)); |
| |
| xsnprintf(ident->ident, sizeof(ident->ident), |
| ": %s $", sha1_to_hex(sha1)); |
| strbuf_init(&ident->left, 0); |
| ident->filter.vtbl = &ident_vtbl; |
| ident->state = 0; |
| return (struct stream_filter *)ident; |
| } |
| |
| /* |
| * Return an appropriately constructed filter for the path, or NULL if |
| * the contents cannot be filtered without reading the whole thing |
| * in-core. |
| * |
| * Note that you would be crazy to set CRLF, smuge/clean or ident to a |
| * large binary blob you would want us not to slurp into the memory! |
| */ |
| struct stream_filter *get_stream_filter(const char *path, const unsigned char *sha1) |
| { |
| struct conv_attrs ca; |
| struct stream_filter *filter = NULL; |
| |
| convert_attrs(&ca, path); |
| if (ca.drv && (ca.drv->process || ca.drv->smudge || ca.drv->clean)) |
| return NULL; |
| |
| if (ca.crlf_action == CRLF_AUTO || ca.crlf_action == CRLF_AUTO_CRLF) |
| return NULL; |
| |
| if (ca.ident) |
| filter = ident_filter(sha1); |
| |
| if (output_eol(ca.crlf_action) == EOL_CRLF) |
| filter = cascade_filter(filter, lf_to_crlf_filter()); |
| else |
| filter = cascade_filter(filter, &null_filter_singleton); |
| |
| return filter; |
| } |
| |
| void free_stream_filter(struct stream_filter *filter) |
| { |
| filter->vtbl->free(filter); |
| } |
| |
| int stream_filter(struct stream_filter *filter, |
| const char *input, size_t *isize_p, |
| char *output, size_t *osize_p) |
| { |
| return filter->vtbl->filter(filter, input, isize_p, output, osize_p); |
| } |