Merge branch 'dl/cocci-everywhere'
[git/git.git] / quote.c
1 #include "cache.h"
2 #include "quote.h"
3 #include "argv-array.h"
4
5 int quote_path_fully = 1;
6
7 static inline int need_bs_quote(char c)
8 {
9 return (c == '\'' || c == '!');
10 }
11
12 /* Help to copy the thing properly quoted for the shell safety.
13 * any single quote is replaced with '\'', any exclamation point
14 * is replaced with '\!', and the whole thing is enclosed in a
15 * single quote pair.
16 *
17 * E.g.
18 * original sq_quote result
19 * name ==> name ==> 'name'
20 * a b ==> a b ==> 'a b'
21 * a'b ==> a'\''b ==> 'a'\''b'
22 * a!b ==> a'\!'b ==> 'a'\!'b'
23 */
24 void sq_quote_buf(struct strbuf *dst, const char *src)
25 {
26 char *to_free = NULL;
27
28 if (dst->buf == src)
29 to_free = strbuf_detach(dst, NULL);
30
31 strbuf_addch(dst, '\'');
32 while (*src) {
33 size_t len = strcspn(src, "'!");
34 strbuf_add(dst, src, len);
35 src += len;
36 while (need_bs_quote(*src)) {
37 strbuf_addstr(dst, "'\\");
38 strbuf_addch(dst, *src++);
39 strbuf_addch(dst, '\'');
40 }
41 }
42 strbuf_addch(dst, '\'');
43 free(to_free);
44 }
45
46 void sq_quote_buf_pretty(struct strbuf *dst, const char *src)
47 {
48 static const char ok_punct[] = "+,-./:=@_^";
49 const char *p;
50
51 for (p = src; *p; p++) {
52 if (!isalpha(*p) && !isdigit(*p) && !strchr(ok_punct, *p)) {
53 sq_quote_buf(dst, src);
54 return;
55 }
56 }
57
58 /* if we get here, we did not need quoting */
59 strbuf_addstr(dst, src);
60 }
61
62 void sq_quotef(struct strbuf *dst, const char *fmt, ...)
63 {
64 struct strbuf src = STRBUF_INIT;
65
66 va_list ap;
67 va_start(ap, fmt);
68 strbuf_vaddf(&src, fmt, ap);
69 va_end(ap);
70
71 sq_quote_buf(dst, src.buf);
72 strbuf_release(&src);
73 }
74
75 void sq_quote_argv(struct strbuf *dst, const char **argv)
76 {
77 int i;
78
79 /* Copy into destination buffer. */
80 strbuf_grow(dst, 255);
81 for (i = 0; argv[i]; ++i) {
82 strbuf_addch(dst, ' ');
83 sq_quote_buf(dst, argv[i]);
84 }
85 }
86
87 /*
88 * Legacy function to append each argv value, quoted as necessasry,
89 * with whitespace before each value. This results in a leading
90 * space in the result.
91 */
92 void sq_quote_argv_pretty(struct strbuf *dst, const char **argv)
93 {
94 if (argv[0])
95 strbuf_addch(dst, ' ');
96 sq_append_quote_argv_pretty(dst, argv);
97 }
98
99 /*
100 * Append each argv value, quoted as necessary, with whitespace between them.
101 */
102 void sq_append_quote_argv_pretty(struct strbuf *dst, const char **argv)
103 {
104 int i;
105
106 for (i = 0; argv[i]; i++) {
107 if (i > 0)
108 strbuf_addch(dst, ' ');
109 sq_quote_buf_pretty(dst, argv[i]);
110 }
111 }
112
113 static char *sq_dequote_step(char *arg, char **next)
114 {
115 char *dst = arg;
116 char *src = arg;
117 char c;
118
119 if (*src != '\'')
120 return NULL;
121 for (;;) {
122 c = *++src;
123 if (!c)
124 return NULL;
125 if (c != '\'') {
126 *dst++ = c;
127 continue;
128 }
129 /* We stepped out of sq */
130 switch (*++src) {
131 case '\0':
132 *dst = 0;
133 if (next)
134 *next = NULL;
135 return arg;
136 case '\\':
137 /*
138 * Allow backslashed characters outside of
139 * single-quotes only if they need escaping,
140 * and only if we resume the single-quoted part
141 * afterward.
142 */
143 if (need_bs_quote(src[1]) && src[2] == '\'') {
144 *dst++ = src[1];
145 src += 2;
146 continue;
147 }
148 /* Fallthrough */
149 default:
150 if (!next || !isspace(*src))
151 return NULL;
152 do {
153 c = *++src;
154 } while (isspace(c));
155 *dst = 0;
156 *next = src;
157 return arg;
158 }
159 }
160 }
161
162 char *sq_dequote(char *arg)
163 {
164 return sq_dequote_step(arg, NULL);
165 }
166
167 static int sq_dequote_to_argv_internal(char *arg,
168 const char ***argv, int *nr, int *alloc,
169 struct argv_array *array)
170 {
171 char *next = arg;
172
173 if (!*arg)
174 return 0;
175 do {
176 char *dequoted = sq_dequote_step(next, &next);
177 if (!dequoted)
178 return -1;
179 if (argv) {
180 ALLOC_GROW(*argv, *nr + 1, *alloc);
181 (*argv)[(*nr)++] = dequoted;
182 }
183 if (array)
184 argv_array_push(array, dequoted);
185 } while (next);
186
187 return 0;
188 }
189
190 int sq_dequote_to_argv(char *arg, const char ***argv, int *nr, int *alloc)
191 {
192 return sq_dequote_to_argv_internal(arg, argv, nr, alloc, NULL);
193 }
194
195 int sq_dequote_to_argv_array(char *arg, struct argv_array *array)
196 {
197 return sq_dequote_to_argv_internal(arg, NULL, NULL, NULL, array);
198 }
199
200 /* 1 means: quote as octal
201 * 0 means: quote as octal if (quote_path_fully)
202 * -1 means: never quote
203 * c: quote as "\\c"
204 */
205 #define X8(x) x, x, x, x, x, x, x, x
206 #define X16(x) X8(x), X8(x)
207 static signed char const sq_lookup[256] = {
208 /* 0 1 2 3 4 5 6 7 */
209 /* 0x00 */ 1, 1, 1, 1, 1, 1, 1, 'a',
210 /* 0x08 */ 'b', 't', 'n', 'v', 'f', 'r', 1, 1,
211 /* 0x10 */ X16(1),
212 /* 0x20 */ -1, -1, '"', -1, -1, -1, -1, -1,
213 /* 0x28 */ X16(-1), X16(-1), X16(-1),
214 /* 0x58 */ -1, -1, -1, -1,'\\', -1, -1, -1,
215 /* 0x60 */ X16(-1), X8(-1),
216 /* 0x78 */ -1, -1, -1, -1, -1, -1, -1, 1,
217 /* 0x80 */ /* set to 0 */
218 };
219
220 static inline int sq_must_quote(char c)
221 {
222 return sq_lookup[(unsigned char)c] + quote_path_fully > 0;
223 }
224
225 /* returns the longest prefix not needing a quote up to maxlen if positive.
226 This stops at the first \0 because it's marked as a character needing an
227 escape */
228 static size_t next_quote_pos(const char *s, ssize_t maxlen)
229 {
230 size_t len;
231 if (maxlen < 0) {
232 for (len = 0; !sq_must_quote(s[len]); len++);
233 } else {
234 for (len = 0; len < maxlen && !sq_must_quote(s[len]); len++);
235 }
236 return len;
237 }
238
239 /*
240 * C-style name quoting.
241 *
242 * (1) if sb and fp are both NULL, inspect the input name and counts the
243 * number of bytes that are needed to hold c_style quoted version of name,
244 * counting the double quotes around it but not terminating NUL, and
245 * returns it.
246 * However, if name does not need c_style quoting, it returns 0.
247 *
248 * (2) if sb or fp are not NULL, it emits the c_style quoted version
249 * of name, enclosed with double quotes if asked and needed only.
250 * Return value is the same as in (1).
251 */
252 static size_t quote_c_style_counted(const char *name, ssize_t maxlen,
253 struct strbuf *sb, FILE *fp, int no_dq)
254 {
255 #undef EMIT
256 #define EMIT(c) \
257 do { \
258 if (sb) strbuf_addch(sb, (c)); \
259 if (fp) fputc((c), fp); \
260 count++; \
261 } while (0)
262 #define EMITBUF(s, l) \
263 do { \
264 if (sb) strbuf_add(sb, (s), (l)); \
265 if (fp) fwrite((s), (l), 1, fp); \
266 count += (l); \
267 } while (0)
268
269 size_t len, count = 0;
270 const char *p = name;
271
272 for (;;) {
273 int ch;
274
275 len = next_quote_pos(p, maxlen);
276 if (len == maxlen || (maxlen < 0 && !p[len]))
277 break;
278
279 if (!no_dq && p == name)
280 EMIT('"');
281
282 EMITBUF(p, len);
283 EMIT('\\');
284 p += len;
285 ch = (unsigned char)*p++;
286 if (maxlen >= 0)
287 maxlen -= len + 1;
288 if (sq_lookup[ch] >= ' ') {
289 EMIT(sq_lookup[ch]);
290 } else {
291 EMIT(((ch >> 6) & 03) + '0');
292 EMIT(((ch >> 3) & 07) + '0');
293 EMIT(((ch >> 0) & 07) + '0');
294 }
295 }
296
297 EMITBUF(p, len);
298 if (p == name) /* no ending quote needed */
299 return 0;
300
301 if (!no_dq)
302 EMIT('"');
303 return count;
304 }
305
306 size_t quote_c_style(const char *name, struct strbuf *sb, FILE *fp, int nodq)
307 {
308 return quote_c_style_counted(name, -1, sb, fp, nodq);
309 }
310
311 void quote_two_c_style(struct strbuf *sb, const char *prefix, const char *path, int nodq)
312 {
313 if (quote_c_style(prefix, NULL, NULL, 0) ||
314 quote_c_style(path, NULL, NULL, 0)) {
315 if (!nodq)
316 strbuf_addch(sb, '"');
317 quote_c_style(prefix, sb, NULL, 1);
318 quote_c_style(path, sb, NULL, 1);
319 if (!nodq)
320 strbuf_addch(sb, '"');
321 } else {
322 strbuf_addstr(sb, prefix);
323 strbuf_addstr(sb, path);
324 }
325 }
326
327 void write_name_quoted(const char *name, FILE *fp, int terminator)
328 {
329 if (terminator) {
330 quote_c_style(name, NULL, fp, 0);
331 } else {
332 fputs(name, fp);
333 }
334 fputc(terminator, fp);
335 }
336
337 void write_name_quoted_relative(const char *name, const char *prefix,
338 FILE *fp, int terminator)
339 {
340 struct strbuf sb = STRBUF_INIT;
341
342 name = relative_path(name, prefix, &sb);
343 write_name_quoted(name, fp, terminator);
344
345 strbuf_release(&sb);
346 }
347
348 /* quote path as relative to the given prefix */
349 char *quote_path_relative(const char *in, const char *prefix,
350 struct strbuf *out)
351 {
352 struct strbuf sb = STRBUF_INIT;
353 const char *rel = relative_path(in, prefix, &sb);
354 strbuf_reset(out);
355 quote_c_style_counted(rel, strlen(rel), out, NULL, 0);
356 strbuf_release(&sb);
357
358 return out->buf;
359 }
360
361 /*
362 * C-style name unquoting.
363 *
364 * Quoted should point at the opening double quote.
365 * + Returns 0 if it was able to unquote the string properly, and appends the
366 * result in the strbuf `sb'.
367 * + Returns -1 in case of error, and doesn't touch the strbuf. Though note
368 * that this function will allocate memory in the strbuf, so calling
369 * strbuf_release is mandatory whichever result unquote_c_style returns.
370 *
371 * Updates endp pointer to point at one past the ending double quote if given.
372 */
373 int unquote_c_style(struct strbuf *sb, const char *quoted, const char **endp)
374 {
375 size_t oldlen = sb->len, len;
376 int ch, ac;
377
378 if (*quoted++ != '"')
379 return -1;
380
381 for (;;) {
382 len = strcspn(quoted, "\"\\");
383 strbuf_add(sb, quoted, len);
384 quoted += len;
385
386 switch (*quoted++) {
387 case '"':
388 if (endp)
389 *endp = quoted;
390 return 0;
391 case '\\':
392 break;
393 default:
394 goto error;
395 }
396
397 switch ((ch = *quoted++)) {
398 case 'a': ch = '\a'; break;
399 case 'b': ch = '\b'; break;
400 case 'f': ch = '\f'; break;
401 case 'n': ch = '\n'; break;
402 case 'r': ch = '\r'; break;
403 case 't': ch = '\t'; break;
404 case 'v': ch = '\v'; break;
405
406 case '\\': case '"':
407 break; /* verbatim */
408
409 /* octal values with first digit over 4 overflow */
410 case '0': case '1': case '2': case '3':
411 ac = ((ch - '0') << 6);
412 if ((ch = *quoted++) < '0' || '7' < ch)
413 goto error;
414 ac |= ((ch - '0') << 3);
415 if ((ch = *quoted++) < '0' || '7' < ch)
416 goto error;
417 ac |= (ch - '0');
418 ch = ac;
419 break;
420 default:
421 goto error;
422 }
423 strbuf_addch(sb, ch);
424 }
425
426 error:
427 strbuf_setlen(sb, oldlen);
428 return -1;
429 }
430
431 /* quoting as a string literal for other languages */
432
433 void perl_quote_buf(struct strbuf *sb, const char *src)
434 {
435 const char sq = '\'';
436 const char bq = '\\';
437 char c;
438
439 strbuf_addch(sb, sq);
440 while ((c = *src++)) {
441 if (c == sq || c == bq)
442 strbuf_addch(sb, bq);
443 strbuf_addch(sb, c);
444 }
445 strbuf_addch(sb, sq);
446 }
447
448 void python_quote_buf(struct strbuf *sb, const char *src)
449 {
450 const char sq = '\'';
451 const char bq = '\\';
452 const char nl = '\n';
453 char c;
454
455 strbuf_addch(sb, sq);
456 while ((c = *src++)) {
457 if (c == nl) {
458 strbuf_addch(sb, bq);
459 strbuf_addch(sb, 'n');
460 continue;
461 }
462 if (c == sq || c == bq)
463 strbuf_addch(sb, bq);
464 strbuf_addch(sb, c);
465 }
466 strbuf_addch(sb, sq);
467 }
468
469 void tcl_quote_buf(struct strbuf *sb, const char *src)
470 {
471 char c;
472
473 strbuf_addch(sb, '"');
474 while ((c = *src++)) {
475 switch (c) {
476 case '[': case ']':
477 case '{': case '}':
478 case '$': case '\\': case '"':
479 strbuf_addch(sb, '\\');
480 /* fallthrough */
481 default:
482 strbuf_addch(sb, c);
483 break;
484 case '\f':
485 strbuf_addstr(sb, "\\f");
486 break;
487 case '\r':
488 strbuf_addstr(sb, "\\r");
489 break;
490 case '\n':
491 strbuf_addstr(sb, "\\n");
492 break;
493 case '\t':
494 strbuf_addstr(sb, "\\t");
495 break;
496 case '\v':
497 strbuf_addstr(sb, "\\v");
498 break;
499 }
500 }
501 strbuf_addch(sb, '"');
502 }
503
504 void basic_regex_quote_buf(struct strbuf *sb, const char *src)
505 {
506 char c;
507
508 if (*src == '^') {
509 /* only beginning '^' is special and needs quoting */
510 strbuf_addch(sb, '\\');
511 strbuf_addch(sb, *src++);
512 }
513 if (*src == '*')
514 /* beginning '*' is not special, no quoting */
515 strbuf_addch(sb, *src++);
516
517 while ((c = *src++)) {
518 switch (c) {
519 case '[':
520 case '.':
521 case '\\':
522 case '*':
523 strbuf_addch(sb, '\\');
524 strbuf_addch(sb, c);
525 break;
526
527 case '$':
528 /* only the end '$' is special and needs quoting */
529 if (*src == '\0')
530 strbuf_addch(sb, '\\');
531 strbuf_addch(sb, c);
532 break;
533
534 default:
535 strbuf_addch(sb, c);
536 break;
537 }
538 }
539 }