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