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