| #include "cache.h" |
| #include "quote.h" |
| |
| int quote_path_fully = 1; |
| |
| /* Help to copy the thing properly quoted for the shell safety. |
| * any single quote is replaced with '\'', any exclamation point |
| * is replaced with '\!', and the whole thing is enclosed in a |
| * |
| * E.g. |
| * original sq_quote result |
| * name ==> name ==> 'name' |
| * a b ==> a b ==> 'a b' |
| * a'b ==> a'\''b ==> 'a'\''b' |
| * a!b ==> a'\!'b ==> 'a'\!'b' |
| */ |
| static inline int need_bs_quote(char c) |
| { |
| return (c == '\'' || c == '!'); |
| } |
| |
| void sq_quote_buf(struct strbuf *dst, const char *src) |
| { |
| char *to_free = NULL; |
| |
| if (dst->buf == src) |
| to_free = strbuf_detach(dst, NULL); |
| |
| strbuf_addch(dst, '\''); |
| while (*src) { |
| size_t len = strcspn(src, "'!"); |
| strbuf_add(dst, src, len); |
| src += len; |
| while (need_bs_quote(*src)) { |
| strbuf_addstr(dst, "'\\"); |
| strbuf_addch(dst, *src++); |
| strbuf_addch(dst, '\''); |
| } |
| } |
| strbuf_addch(dst, '\''); |
| free(to_free); |
| } |
| |
| void sq_quote_print(FILE *stream, const char *src) |
| { |
| char c; |
| |
| fputc('\'', stream); |
| while ((c = *src++)) { |
| if (need_bs_quote(c)) { |
| fputs("'\\", stream); |
| fputc(c, stream); |
| fputc('\'', stream); |
| } else { |
| fputc(c, stream); |
| } |
| } |
| fputc('\'', stream); |
| } |
| |
| void sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen) |
| { |
| int i; |
| |
| /* Copy into destination buffer. */ |
| strbuf_grow(dst, 255); |
| for (i = 0; argv[i]; ++i) { |
| strbuf_addch(dst, ' '); |
| sq_quote_buf(dst, argv[i]); |
| if (maxlen && dst->len > maxlen) |
| die("Too many or long arguments"); |
| } |
| } |
| |
| static char *sq_dequote_step(char *arg, char **next) |
| { |
| char *dst = arg; |
| char *src = arg; |
| char c; |
| |
| if (*src != '\'') |
| return NULL; |
| for (;;) { |
| c = *++src; |
| if (!c) |
| return NULL; |
| if (c != '\'') { |
| *dst++ = c; |
| continue; |
| } |
| /* We stepped out of sq */ |
| switch (*++src) { |
| case '\0': |
| *dst = 0; |
| if (next) |
| *next = NULL; |
| return arg; |
| case '\\': |
| c = *++src; |
| if (need_bs_quote(c) && *++src == '\'') { |
| *dst++ = c; |
| continue; |
| } |
| /* Fallthrough */ |
| default: |
| if (!next || !isspace(*src)) |
| return NULL; |
| do { |
| c = *++src; |
| } while (isspace(c)); |
| *dst = 0; |
| *next = src; |
| return arg; |
| } |
| } |
| } |
| |
| char *sq_dequote(char *arg) |
| { |
| return sq_dequote_step(arg, NULL); |
| } |
| |
| int sq_dequote_to_argv(char *arg, const char ***argv, int *nr, int *alloc) |
| { |
| char *next = arg; |
| |
| if (!*arg) |
| return 0; |
| do { |
| char *dequoted = sq_dequote_step(next, &next); |
| if (!dequoted) |
| return -1; |
| ALLOC_GROW(*argv, *nr + 1, *alloc); |
| (*argv)[(*nr)++] = dequoted; |
| } while (next); |
| |
| return 0; |
| } |
| |
| /* 1 means: quote as octal |
| * 0 means: quote as octal if (quote_path_fully) |
| * -1 means: never quote |
| * c: quote as "\\c" |
| */ |
| #define X8(x) x, x, x, x, x, x, x, x |
| #define X16(x) X8(x), X8(x) |
| static signed char const sq_lookup[256] = { |
| /* 0 1 2 3 4 5 6 7 */ |
| /* 0x00 */ 1, 1, 1, 1, 1, 1, 1, 'a', |
| /* 0x08 */ 'b', 't', 'n', 'v', 'f', 'r', 1, 1, |
| /* 0x10 */ X16(1), |
| /* 0x20 */ -1, -1, '"', -1, -1, -1, -1, -1, |
| /* 0x28 */ X16(-1), X16(-1), X16(-1), |
| /* 0x58 */ -1, -1, -1, -1,'\\', -1, -1, -1, |
| /* 0x60 */ X16(-1), X8(-1), |
| /* 0x78 */ -1, -1, -1, -1, -1, -1, -1, 1, |
| /* 0x80 */ /* set to 0 */ |
| }; |
| |
| static inline int sq_must_quote(char c) |
| { |
| return sq_lookup[(unsigned char)c] + quote_path_fully > 0; |
| } |
| |
| /* returns the longest prefix not needing a quote up to maxlen if positive. |
| This stops at the first \0 because it's marked as a character needing an |
| escape */ |
| static size_t next_quote_pos(const char *s, ssize_t maxlen) |
| { |
| size_t len; |
| if (maxlen < 0) { |
| for (len = 0; !sq_must_quote(s[len]); len++); |
| } else { |
| for (len = 0; len < maxlen && !sq_must_quote(s[len]); len++); |
| } |
| return len; |
| } |
| |
| /* |
| * C-style name quoting. |
| * |
| * (1) if sb and fp are both NULL, inspect the input name and counts the |
| * number of bytes that are needed to hold c_style quoted version of name, |
| * counting the double quotes around it but not terminating NUL, and |
| * returns it. |
| * However, if name does not need c_style quoting, it returns 0. |
| * |
| * (2) if sb or fp are not NULL, it emits the c_style quoted version |
| * of name, enclosed with double quotes if asked and needed only. |
| * Return value is the same as in (1). |
| */ |
| static size_t quote_c_style_counted(const char *name, ssize_t maxlen, |
| struct strbuf *sb, FILE *fp, int no_dq) |
| { |
| #undef EMIT |
| #define EMIT(c) \ |
| do { \ |
| if (sb) strbuf_addch(sb, (c)); \ |
| if (fp) fputc((c), fp); \ |
| count++; \ |
| } while (0) |
| #define EMITBUF(s, l) \ |
| do { \ |
| if (sb) strbuf_add(sb, (s), (l)); \ |
| if (fp) fwrite((s), (l), 1, fp); \ |
| count += (l); \ |
| } while (0) |
| |
| size_t len, count = 0; |
| const char *p = name; |
| |
| for (;;) { |
| int ch; |
| |
| len = next_quote_pos(p, maxlen); |
| if (len == maxlen || (maxlen < 0 && !p[len])) |
| break; |
| |
| if (!no_dq && p == name) |
| EMIT('"'); |
| |
| EMITBUF(p, len); |
| EMIT('\\'); |
| p += len; |
| ch = (unsigned char)*p++; |
| if (maxlen >= 0) |
| maxlen -= len + 1; |
| if (sq_lookup[ch] >= ' ') { |
| EMIT(sq_lookup[ch]); |
| } else { |
| EMIT(((ch >> 6) & 03) + '0'); |
| EMIT(((ch >> 3) & 07) + '0'); |
| EMIT(((ch >> 0) & 07) + '0'); |
| } |
| } |
| |
| EMITBUF(p, len); |
| if (p == name) /* no ending quote needed */ |
| return 0; |
| |
| if (!no_dq) |
| EMIT('"'); |
| return count; |
| } |
| |
| size_t quote_c_style(const char *name, struct strbuf *sb, FILE *fp, int nodq) |
| { |
| return quote_c_style_counted(name, -1, sb, fp, nodq); |
| } |
| |
| void quote_two_c_style(struct strbuf *sb, const char *prefix, const char *path, int nodq) |
| { |
| if (quote_c_style(prefix, NULL, NULL, 0) || |
| quote_c_style(path, NULL, NULL, 0)) { |
| if (!nodq) |
| strbuf_addch(sb, '"'); |
| quote_c_style(prefix, sb, NULL, 1); |
| quote_c_style(path, sb, NULL, 1); |
| if (!nodq) |
| strbuf_addch(sb, '"'); |
| } else { |
| strbuf_addstr(sb, prefix); |
| strbuf_addstr(sb, path); |
| } |
| } |
| |
| void write_name_quoted(const char *name, FILE *fp, int terminator) |
| { |
| if (terminator) { |
| quote_c_style(name, NULL, fp, 0); |
| } else { |
| fputs(name, fp); |
| } |
| fputc(terminator, fp); |
| } |
| |
| void write_name_quotedpfx(const char *pfx, size_t pfxlen, |
| const char *name, FILE *fp, int terminator) |
| { |
| int needquote = 0; |
| |
| if (terminator) { |
| needquote = next_quote_pos(pfx, pfxlen) < pfxlen |
| || name[next_quote_pos(name, -1)]; |
| } |
| if (needquote) { |
| fputc('"', fp); |
| quote_c_style_counted(pfx, pfxlen, NULL, fp, 1); |
| quote_c_style(name, NULL, fp, 1); |
| fputc('"', fp); |
| } else { |
| fwrite(pfx, pfxlen, 1, fp); |
| fputs(name, fp); |
| } |
| fputc(terminator, fp); |
| } |
| |
| static const char *path_relative(const char *in, int len, |
| struct strbuf *sb, const char *prefix, |
| int prefix_len); |
| |
| void write_name_quoted_relative(const char *name, size_t len, |
| const char *prefix, size_t prefix_len, |
| FILE *fp, int terminator) |
| { |
| struct strbuf sb = STRBUF_INIT; |
| |
| name = path_relative(name, len, &sb, prefix, prefix_len); |
| write_name_quoted(name, fp, terminator); |
| |
| strbuf_release(&sb); |
| } |
| |
| /* |
| * Give path as relative to prefix. |
| * |
| * The strbuf may or may not be used, so do not assume it contains the |
| * returned path. |
| */ |
| static const char *path_relative(const char *in, int len, |
| struct strbuf *sb, const char *prefix, |
| int prefix_len) |
| { |
| int off, i; |
| |
| if (len < 0) |
| len = strlen(in); |
| if (prefix && prefix_len < 0) |
| prefix_len = strlen(prefix); |
| |
| off = 0; |
| i = 0; |
| while (i < prefix_len && i < len && prefix[i] == in[i]) { |
| if (prefix[i] == '/') |
| off = i + 1; |
| i++; |
| } |
| in += off; |
| len -= off; |
| |
| if (i >= prefix_len) |
| return in; |
| |
| strbuf_reset(sb); |
| strbuf_grow(sb, len); |
| |
| while (i < prefix_len) { |
| if (prefix[i] == '/') |
| strbuf_addstr(sb, "../"); |
| i++; |
| } |
| strbuf_add(sb, in, len); |
| |
| return sb->buf; |
| } |
| |
| /* quote path as relative to the given prefix */ |
| char *quote_path_relative(const char *in, int len, |
| struct strbuf *out, const char *prefix) |
| { |
| struct strbuf sb = STRBUF_INIT; |
| const char *rel = path_relative(in, len, &sb, prefix, -1); |
| strbuf_reset(out); |
| quote_c_style_counted(rel, strlen(rel), out, NULL, 0); |
| strbuf_release(&sb); |
| |
| if (!out->len) |
| strbuf_addstr(out, "./"); |
| |
| return out->buf; |
| } |
| |
| /* |
| * C-style name unquoting. |
| * |
| * Quoted should point at the opening double quote. |
| * + Returns 0 if it was able to unquote the string properly, and appends the |
| * result in the strbuf `sb'. |
| * + Returns -1 in case of error, and doesn't touch the strbuf. Though note |
| * that this function will allocate memory in the strbuf, so calling |
| * strbuf_release is mandatory whichever result unquote_c_style returns. |
| * |
| * Updates endp pointer to point at one past the ending double quote if given. |
| */ |
| int unquote_c_style(struct strbuf *sb, const char *quoted, const char **endp) |
| { |
| size_t oldlen = sb->len, len; |
| int ch, ac; |
| |
| if (*quoted++ != '"') |
| return -1; |
| |
| for (;;) { |
| len = strcspn(quoted, "\"\\"); |
| strbuf_add(sb, quoted, len); |
| quoted += len; |
| |
| switch (*quoted++) { |
| case '"': |
| if (endp) |
| *endp = quoted; |
| return 0; |
| case '\\': |
| break; |
| default: |
| goto error; |
| } |
| |
| switch ((ch = *quoted++)) { |
| case 'a': ch = '\a'; break; |
| case 'b': ch = '\b'; break; |
| case 'f': ch = '\f'; break; |
| case 'n': ch = '\n'; break; |
| case 'r': ch = '\r'; break; |
| case 't': ch = '\t'; break; |
| case 'v': ch = '\v'; break; |
| |
| case '\\': case '"': |
| break; /* verbatim */ |
| |
| /* octal values with first digit over 4 overflow */ |
| case '0': case '1': case '2': case '3': |
| ac = ((ch - '0') << 6); |
| if ((ch = *quoted++) < '0' || '7' < ch) |
| goto error; |
| ac |= ((ch - '0') << 3); |
| if ((ch = *quoted++) < '0' || '7' < ch) |
| goto error; |
| ac |= (ch - '0'); |
| ch = ac; |
| break; |
| default: |
| goto error; |
| } |
| strbuf_addch(sb, ch); |
| } |
| |
| error: |
| strbuf_setlen(sb, oldlen); |
| return -1; |
| } |
| |
| /* quoting as a string literal for other languages */ |
| |
| void perl_quote_print(FILE *stream, const char *src) |
| { |
| const char sq = '\''; |
| const char bq = '\\'; |
| char c; |
| |
| fputc(sq, stream); |
| while ((c = *src++)) { |
| if (c == sq || c == bq) |
| fputc(bq, stream); |
| fputc(c, stream); |
| } |
| fputc(sq, stream); |
| } |
| |
| void python_quote_print(FILE *stream, const char *src) |
| { |
| const char sq = '\''; |
| const char bq = '\\'; |
| const char nl = '\n'; |
| char c; |
| |
| fputc(sq, stream); |
| while ((c = *src++)) { |
| if (c == nl) { |
| fputc(bq, stream); |
| fputc('n', stream); |
| continue; |
| } |
| if (c == sq || c == bq) |
| fputc(bq, stream); |
| fputc(c, stream); |
| } |
| fputc(sq, stream); |
| } |
| |
| void tcl_quote_print(FILE *stream, const char *src) |
| { |
| char c; |
| |
| fputc('"', stream); |
| while ((c = *src++)) { |
| switch (c) { |
| case '[': case ']': |
| case '{': case '}': |
| case '$': case '\\': case '"': |
| fputc('\\', stream); |
| default: |
| fputc(c, stream); |
| break; |
| case '\f': |
| fputs("\\f", stream); |
| break; |
| case '\r': |
| fputs("\\r", stream); |
| break; |
| case '\n': |
| fputs("\\n", stream); |
| break; |
| case '\t': |
| fputs("\\t", stream); |
| break; |
| case '\v': |
| fputs("\\v", stream); |
| break; |
| } |
| } |
| fputc('"', stream); |
| } |