Start preparing for 1.8.4.2
[alt-git.git] / quote.c
blob5c8808160e700af0c055a84f8527eb3ac76962d9
1 #include "cache.h"
2 #include "quote.h"
3 #include "argv-array.h"
5 int quote_path_fully = 1;
7 /* Help to copy the thing properly quoted for the shell safety.
8 * any single quote is replaced with '\'', any exclamation point
9 * is replaced with '\!', and the whole thing is enclosed in a
11 * E.g.
12 * original sq_quote result
13 * name ==> name ==> 'name'
14 * a b ==> a b ==> 'a b'
15 * a'b ==> a'\''b ==> 'a'\''b'
16 * a!b ==> a'\!'b ==> 'a'\!'b'
18 static inline int need_bs_quote(char c)
20 return (c == '\'' || c == '!');
23 void sq_quote_buf(struct strbuf *dst, const char *src)
25 char *to_free = NULL;
27 if (dst->buf == src)
28 to_free = strbuf_detach(dst, NULL);
30 strbuf_addch(dst, '\'');
31 while (*src) {
32 size_t len = strcspn(src, "'!");
33 strbuf_add(dst, src, len);
34 src += len;
35 while (need_bs_quote(*src)) {
36 strbuf_addstr(dst, "'\\");
37 strbuf_addch(dst, *src++);
38 strbuf_addch(dst, '\'');
41 strbuf_addch(dst, '\'');
42 free(to_free);
45 void sq_quote_print(FILE *stream, const char *src)
47 char c;
49 fputc('\'', stream);
50 while ((c = *src++)) {
51 if (need_bs_quote(c)) {
52 fputs("'\\", stream);
53 fputc(c, stream);
54 fputc('\'', stream);
55 } else {
56 fputc(c, stream);
59 fputc('\'', stream);
62 void sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
64 int i;
66 /* Copy into destination buffer. */
67 strbuf_grow(dst, 255);
68 for (i = 0; argv[i]; ++i) {
69 strbuf_addch(dst, ' ');
70 sq_quote_buf(dst, argv[i]);
71 if (maxlen && dst->len > maxlen)
72 die("Too many or long arguments");
76 static char *sq_dequote_step(char *arg, char **next)
78 char *dst = arg;
79 char *src = arg;
80 char c;
82 if (*src != '\'')
83 return NULL;
84 for (;;) {
85 c = *++src;
86 if (!c)
87 return NULL;
88 if (c != '\'') {
89 *dst++ = c;
90 continue;
92 /* We stepped out of sq */
93 switch (*++src) {
94 case '\0':
95 *dst = 0;
96 if (next)
97 *next = NULL;
98 return arg;
99 case '\\':
100 c = *++src;
101 if (need_bs_quote(c) && *++src == '\'') {
102 *dst++ = c;
103 continue;
105 /* Fallthrough */
106 default:
107 if (!next || !isspace(*src))
108 return NULL;
109 do {
110 c = *++src;
111 } while (isspace(c));
112 *dst = 0;
113 *next = src;
114 return arg;
119 char *sq_dequote(char *arg)
121 return sq_dequote_step(arg, NULL);
124 static int sq_dequote_to_argv_internal(char *arg,
125 const char ***argv, int *nr, int *alloc,
126 struct argv_array *array)
128 char *next = arg;
130 if (!*arg)
131 return 0;
132 do {
133 char *dequoted = sq_dequote_step(next, &next);
134 if (!dequoted)
135 return -1;
136 if (argv) {
137 ALLOC_GROW(*argv, *nr + 1, *alloc);
138 (*argv)[(*nr)++] = dequoted;
140 if (array)
141 argv_array_push(array, dequoted);
142 } while (next);
144 return 0;
147 int sq_dequote_to_argv(char *arg, const char ***argv, int *nr, int *alloc)
149 return sq_dequote_to_argv_internal(arg, argv, nr, alloc, NULL);
152 int sq_dequote_to_argv_array(char *arg, struct argv_array *array)
154 return sq_dequote_to_argv_internal(arg, NULL, NULL, NULL, array);
157 /* 1 means: quote as octal
158 * 0 means: quote as octal if (quote_path_fully)
159 * -1 means: never quote
160 * c: quote as "\\c"
162 #define X8(x) x, x, x, x, x, x, x, x
163 #define X16(x) X8(x), X8(x)
164 static signed char const sq_lookup[256] = {
165 /* 0 1 2 3 4 5 6 7 */
166 /* 0x00 */ 1, 1, 1, 1, 1, 1, 1, 'a',
167 /* 0x08 */ 'b', 't', 'n', 'v', 'f', 'r', 1, 1,
168 /* 0x10 */ X16(1),
169 /* 0x20 */ -1, -1, '"', -1, -1, -1, -1, -1,
170 /* 0x28 */ X16(-1), X16(-1), X16(-1),
171 /* 0x58 */ -1, -1, -1, -1,'\\', -1, -1, -1,
172 /* 0x60 */ X16(-1), X8(-1),
173 /* 0x78 */ -1, -1, -1, -1, -1, -1, -1, 1,
174 /* 0x80 */ /* set to 0 */
177 static inline int sq_must_quote(char c)
179 return sq_lookup[(unsigned char)c] + quote_path_fully > 0;
182 /* returns the longest prefix not needing a quote up to maxlen if positive.
183 This stops at the first \0 because it's marked as a character needing an
184 escape */
185 static size_t next_quote_pos(const char *s, ssize_t maxlen)
187 size_t len;
188 if (maxlen < 0) {
189 for (len = 0; !sq_must_quote(s[len]); len++);
190 } else {
191 for (len = 0; len < maxlen && !sq_must_quote(s[len]); len++);
193 return len;
197 * C-style name quoting.
199 * (1) if sb and fp are both NULL, inspect the input name and counts the
200 * number of bytes that are needed to hold c_style quoted version of name,
201 * counting the double quotes around it but not terminating NUL, and
202 * returns it.
203 * However, if name does not need c_style quoting, it returns 0.
205 * (2) if sb or fp are not NULL, it emits the c_style quoted version
206 * of name, enclosed with double quotes if asked and needed only.
207 * Return value is the same as in (1).
209 static size_t quote_c_style_counted(const char *name, ssize_t maxlen,
210 struct strbuf *sb, FILE *fp, int no_dq)
212 #undef EMIT
213 #define EMIT(c) \
214 do { \
215 if (sb) strbuf_addch(sb, (c)); \
216 if (fp) fputc((c), fp); \
217 count++; \
218 } while (0)
219 #define EMITBUF(s, l) \
220 do { \
221 if (sb) strbuf_add(sb, (s), (l)); \
222 if (fp) fwrite((s), (l), 1, fp); \
223 count += (l); \
224 } while (0)
226 size_t len, count = 0;
227 const char *p = name;
229 for (;;) {
230 int ch;
232 len = next_quote_pos(p, maxlen);
233 if (len == maxlen || (maxlen < 0 && !p[len]))
234 break;
236 if (!no_dq && p == name)
237 EMIT('"');
239 EMITBUF(p, len);
240 EMIT('\\');
241 p += len;
242 ch = (unsigned char)*p++;
243 if (maxlen >= 0)
244 maxlen -= len + 1;
245 if (sq_lookup[ch] >= ' ') {
246 EMIT(sq_lookup[ch]);
247 } else {
248 EMIT(((ch >> 6) & 03) + '0');
249 EMIT(((ch >> 3) & 07) + '0');
250 EMIT(((ch >> 0) & 07) + '0');
254 EMITBUF(p, len);
255 if (p == name) /* no ending quote needed */
256 return 0;
258 if (!no_dq)
259 EMIT('"');
260 return count;
263 size_t quote_c_style(const char *name, struct strbuf *sb, FILE *fp, int nodq)
265 return quote_c_style_counted(name, -1, sb, fp, nodq);
268 void quote_two_c_style(struct strbuf *sb, const char *prefix, const char *path, int nodq)
270 if (quote_c_style(prefix, NULL, NULL, 0) ||
271 quote_c_style(path, NULL, NULL, 0)) {
272 if (!nodq)
273 strbuf_addch(sb, '"');
274 quote_c_style(prefix, sb, NULL, 1);
275 quote_c_style(path, sb, NULL, 1);
276 if (!nodq)
277 strbuf_addch(sb, '"');
278 } else {
279 strbuf_addstr(sb, prefix);
280 strbuf_addstr(sb, path);
284 void write_name_quoted(const char *name, FILE *fp, int terminator)
286 if (terminator) {
287 quote_c_style(name, NULL, fp, 0);
288 } else {
289 fputs(name, fp);
291 fputc(terminator, fp);
294 void write_name_quotedpfx(const char *pfx, size_t pfxlen,
295 const char *name, FILE *fp, int terminator)
297 int needquote = 0;
299 if (terminator) {
300 needquote = next_quote_pos(pfx, pfxlen) < pfxlen
301 || name[next_quote_pos(name, -1)];
303 if (needquote) {
304 fputc('"', fp);
305 quote_c_style_counted(pfx, pfxlen, NULL, fp, 1);
306 quote_c_style(name, NULL, fp, 1);
307 fputc('"', fp);
308 } else {
309 fwrite(pfx, pfxlen, 1, fp);
310 fputs(name, fp);
312 fputc(terminator, fp);
315 void write_name_quoted_relative(const char *name, const char *prefix,
316 FILE *fp, int terminator)
318 struct strbuf sb = STRBUF_INIT;
320 name = relative_path(name, prefix, &sb);
321 write_name_quoted(name, fp, terminator);
323 strbuf_release(&sb);
326 /* quote path as relative to the given prefix */
327 char *quote_path_relative(const char *in, const char *prefix,
328 struct strbuf *out)
330 struct strbuf sb = STRBUF_INIT;
331 const char *rel = relative_path(in, prefix, &sb);
332 strbuf_reset(out);
333 quote_c_style_counted(rel, strlen(rel), out, NULL, 0);
334 strbuf_release(&sb);
336 return out->buf;
340 * C-style name unquoting.
342 * Quoted should point at the opening double quote.
343 * + Returns 0 if it was able to unquote the string properly, and appends the
344 * result in the strbuf `sb'.
345 * + Returns -1 in case of error, and doesn't touch the strbuf. Though note
346 * that this function will allocate memory in the strbuf, so calling
347 * strbuf_release is mandatory whichever result unquote_c_style returns.
349 * Updates endp pointer to point at one past the ending double quote if given.
351 int unquote_c_style(struct strbuf *sb, const char *quoted, const char **endp)
353 size_t oldlen = sb->len, len;
354 int ch, ac;
356 if (*quoted++ != '"')
357 return -1;
359 for (;;) {
360 len = strcspn(quoted, "\"\\");
361 strbuf_add(sb, quoted, len);
362 quoted += len;
364 switch (*quoted++) {
365 case '"':
366 if (endp)
367 *endp = quoted;
368 return 0;
369 case '\\':
370 break;
371 default:
372 goto error;
375 switch ((ch = *quoted++)) {
376 case 'a': ch = '\a'; break;
377 case 'b': ch = '\b'; break;
378 case 'f': ch = '\f'; break;
379 case 'n': ch = '\n'; break;
380 case 'r': ch = '\r'; break;
381 case 't': ch = '\t'; break;
382 case 'v': ch = '\v'; break;
384 case '\\': case '"':
385 break; /* verbatim */
387 /* octal values with first digit over 4 overflow */
388 case '0': case '1': case '2': case '3':
389 ac = ((ch - '0') << 6);
390 if ((ch = *quoted++) < '0' || '7' < ch)
391 goto error;
392 ac |= ((ch - '0') << 3);
393 if ((ch = *quoted++) < '0' || '7' < ch)
394 goto error;
395 ac |= (ch - '0');
396 ch = ac;
397 break;
398 default:
399 goto error;
401 strbuf_addch(sb, ch);
404 error:
405 strbuf_setlen(sb, oldlen);
406 return -1;
409 /* quoting as a string literal for other languages */
411 void perl_quote_print(FILE *stream, const char *src)
413 const char sq = '\'';
414 const char bq = '\\';
415 char c;
417 fputc(sq, stream);
418 while ((c = *src++)) {
419 if (c == sq || c == bq)
420 fputc(bq, stream);
421 fputc(c, stream);
423 fputc(sq, stream);
426 void python_quote_print(FILE *stream, const char *src)
428 const char sq = '\'';
429 const char bq = '\\';
430 const char nl = '\n';
431 char c;
433 fputc(sq, stream);
434 while ((c = *src++)) {
435 if (c == nl) {
436 fputc(bq, stream);
437 fputc('n', stream);
438 continue;
440 if (c == sq || c == bq)
441 fputc(bq, stream);
442 fputc(c, stream);
444 fputc(sq, stream);
447 void tcl_quote_print(FILE *stream, const char *src)
449 char c;
451 fputc('"', stream);
452 while ((c = *src++)) {
453 switch (c) {
454 case '[': case ']':
455 case '{': case '}':
456 case '$': case '\\': case '"':
457 fputc('\\', stream);
458 default:
459 fputc(c, stream);
460 break;
461 case '\f':
462 fputs("\\f", stream);
463 break;
464 case '\r':
465 fputs("\\r", stream);
466 break;
467 case '\n':
468 fputs("\\n", stream);
469 break;
470 case '\t':
471 fputs("\\t", stream);
472 break;
473 case '\v':
474 fputs("\\v", stream);
475 break;
478 fputc('"', stream);