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