1#include "cache.h"
2#include "quote.h"
3/* Help to copy the thing properly quoted for the shell safety.
5 * any single quote is replaced with '\'', any exclamation point
6 * is replaced with '\!', and the whole thing is enclosed in a
7 *
8 * E.g.
9 * original sq_quote result
10 * name ==> name ==> 'name'
11 * a b ==> a b ==> 'a b'
12 * a'b ==> a'\''b ==> 'a'\''b'
13 * a!b ==> a'\!'b ==> 'a'\!'b'
14 */
15static inline int need_bs_quote(char c)
16{
17 return (c == '\'' || c == '!');
18}
19void sq_quote_buf(struct strbuf *dst, const char *src)
21{
22 char *to_free = NULL;
23 if (dst->buf == src)
25 to_free = strbuf_detach(dst, NULL);
26 strbuf_addch(dst, '\'');
28 while (*src) {
29 size_t len = strcspn(src, "'!");
30 strbuf_add(dst, src, len);
31 src += len;
32 while (need_bs_quote(*src)) {
33 strbuf_addstr(dst, "'\\");
34 strbuf_addch(dst, *src++);
35 strbuf_addch(dst, '\'');
36 }
37 }
38 strbuf_addch(dst, '\'');
39 free(to_free);
40}
41void sq_quote_print(FILE *stream, const char *src)
43{
44 char c;
45 fputc('\'', stream);
47 while ((c = *src++)) {
48 if (need_bs_quote(c)) {
49 fputs("'\\", stream);
50 fputc(c, stream);
51 fputc('\'', stream);
52 } else {
53 fputc(c, stream);
54 }
55 }
56 fputc('\'', stream);
57}
58void sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
60{
61 int i;
62 /* Copy into destination buffer. */
64 strbuf_grow(dst, 255);
65 for (i = 0; argv[i]; ++i) {
66 strbuf_addch(dst, ' ');
67 sq_quote_buf(dst, argv[i]);
68 if (maxlen && dst->len > maxlen)
69 die("Too many or long arguments");
70 }
71}
72char *sq_dequote(char *arg)
74{
75 char *dst = arg;
76 char *src = arg;
77 char c;
78 if (*src != '\'')
80 return NULL;
81 for (;;) {
82 c = *++src;
83 if (!c)
84 return NULL;
85 if (c != '\'') {
86 *dst++ = c;
87 continue;
88 }
89 /* We stepped out of sq */
90 switch (*++src) {
91 case '\0':
92 *dst = 0;
93 return arg;
94 case '\\':
95 c = *++src;
96 if (need_bs_quote(c) && *++src == '\'') {
97 *dst++ = c;
98 continue;
99 }
100 /* Fallthrough */
101 default:
102 return NULL;
103 }
104 }
105}
106/* 1 means: quote as octal
108 * 0 means: quote as octal if (quote_path_fully)
109 * -1 means: never quote
110 * c: quote as "\\c"
111 */
112#define X8(x) x, x, x, x, x, x, x, x
113#define X16(x) X8(x), X8(x)
114static signed char const sq_lookup[256] = {
115 /* 0 1 2 3 4 5 6 7 */
116 /* 0x00 */ 1, 1, 1, 1, 1, 1, 1, 'a',
117 /* 0x08 */ 'b', 't', 'n', 'v', 'f', 'r', 1, 1,
118 /* 0x10 */ X16(1),
119 /* 0x20 */ -1, -1, '"', -1, -1, -1, -1, -1,
120 /* 0x28 */ X16(-1), X16(-1), X16(-1),
121 /* 0x58 */ -1, -1, -1, -1,'\\', -1, -1, -1,
122 /* 0x60 */ X16(-1), X8(-1),
123 /* 0x78 */ -1, -1, -1, -1, -1, -1, -1, 1,
124 /* 0x80 */ /* set to 0 */
125};
126static inline int sq_must_quote(char c)
128{
129 return sq_lookup[(unsigned char)c] + quote_path_fully > 0;
130}
131/* returns the longest prefix not needing a quote up to maxlen if positive.
133 This stops at the first \0 because it's marked as a character needing an
134 escape */
135static size_t next_quote_pos(const char *s, ssize_t maxlen)
136{
137 size_t len;
138 if (maxlen < 0) {
139 for (len = 0; !sq_must_quote(s[len]); len++);
140 } else {
141 for (len = 0; len < maxlen && !sq_must_quote(s[len]); len++);
142 }
143 return len;
144}
145/*
147 * C-style name quoting.
148 *
149 * (1) if sb and fp are both NULL, inspect the input name and counts the
150 * number of bytes that are needed to hold c_style quoted version of name,
151 * counting the double quotes around it but not terminating NUL, and
152 * returns it.
153 * However, if name does not need c_style quoting, it returns 0.
154 *
155 * (2) if sb or fp are not NULL, it emits the c_style quoted version
156 * of name, enclosed with double quotes if asked and needed only.
157 * Return value is the same as in (1).
158 */
159static size_t quote_c_style_counted(const char *name, ssize_t maxlen,
160 struct strbuf *sb, FILE *fp, int no_dq)
161{
162#undef EMIT
163#define EMIT(c) \
164 do { \
165 if (sb) strbuf_addch(sb, (c)); \
166 if (fp) fputc((c), fp); \
167 count++; \
168 } while (0)
169#define EMITBUF(s, l) \
170 do { \
171 if (sb) strbuf_add(sb, (s), (l)); \
172 if (fp) fwrite((s), (l), 1, fp); \
173 count += (l); \
174 } while (0)
175 size_t len, count = 0;
177 const char *p = name;
178 for (;;) {
180 int ch;
181 len = next_quote_pos(p, maxlen);
183 if (len == maxlen || !p[len])
184 break;
185 if (!no_dq && p == name)
187 EMIT('"');
188 EMITBUF(p, len);
190 EMIT('\\');
191 p += len;
192 ch = (unsigned char)*p++;
193 if (sq_lookup[ch] >= ' ') {
194 EMIT(sq_lookup[ch]);
195 } else {
196 EMIT(((ch >> 6) & 03) + '0');
197 EMIT(((ch >> 3) & 07) + '0');
198 EMIT(((ch >> 0) & 07) + '0');
199 }
200 }
201 EMITBUF(p, len);
203 if (p == name) /* no ending quote needed */
204 return 0;
205 if (!no_dq)
207 EMIT('"');
208 return count;
209}
210size_t quote_c_style(const char *name, struct strbuf *sb, FILE *fp, int nodq)
212{
213 return quote_c_style_counted(name, -1, sb, fp, nodq);
214}
215void quote_two_c_style(struct strbuf *sb, const char *prefix, const char *path, int nodq)
217{
218 if (quote_c_style(prefix, NULL, NULL, 0) ||
219 quote_c_style(path, NULL, NULL, 0)) {
220 if (!nodq)
221 strbuf_addch(sb, '"');
222 quote_c_style(prefix, sb, NULL, 1);
223 quote_c_style(path, sb, NULL, 1);
224 if (!nodq)
225 strbuf_addch(sb, '"');
226 } else {
227 strbuf_addstr(sb, prefix);
228 strbuf_addstr(sb, path);
229 }
230}
231void write_name_quoted(const char *name, FILE *fp, int terminator)
233{
234 if (terminator) {
235 quote_c_style(name, NULL, fp, 0);
236 } else {
237 fputs(name, fp);
238 }
239 fputc(terminator, fp);
240}
241extern void write_name_quotedpfx(const char *pfx, size_t pfxlen,
243 const char *name, FILE *fp, int terminator)
244{
245 int needquote = 0;
246 if (terminator) {
248 needquote = next_quote_pos(pfx, pfxlen) < pfxlen
249 || name[next_quote_pos(name, -1)];
250 }
251 if (needquote) {
252 fputc('"', fp);
253 quote_c_style_counted(pfx, pfxlen, NULL, fp, 1);
254 quote_c_style(name, NULL, fp, 1);
255 fputc('"', fp);
256 } else {
257 fwrite(pfx, pfxlen, 1, fp);
258 fputs(name, fp);
259 }
260 fputc(terminator, fp);
261}
262/*
264 * C-style name unquoting.
265 *
266 * Quoted should point at the opening double quote.
267 * + Returns 0 if it was able to unquote the string properly, and appends the
268 * result in the strbuf `sb'.
269 * + Returns -1 in case of error, and doesn't touch the strbuf. Though note
270 * that this function will allocate memory in the strbuf, so calling
271 * strbuf_release is mandatory whichever result unquote_c_style returns.
272 *
273 * Updates endp pointer to point at one past the ending double quote if given.
274 */
275int unquote_c_style(struct strbuf *sb, const char *quoted, const char **endp)
276{
277 size_t oldlen = sb->len, len;
278 int ch, ac;
279 if (*quoted++ != '"')
281 return -1;
282 for (;;) {
284 len = strcspn(quoted, "\"\\");
285 strbuf_add(sb, quoted, len);
286 quoted += len;
287 switch (*quoted++) {
289 case '"':
290 if (endp)
291 *endp = quoted + 1;
292 return 0;
293 case '\\':
294 break;
295 default:
296 goto error;
297 }
298 switch ((ch = *quoted++)) {
300 case 'a': ch = '\a'; break;
301 case 'b': ch = '\b'; break;
302 case 'f': ch = '\f'; break;
303 case 'n': ch = '\n'; break;
304 case 'r': ch = '\r'; break;
305 case 't': ch = '\t'; break;
306 case 'v': ch = '\v'; break;
307 case '\\': case '"':
309 break; /* verbatim */
310 /* octal values with first digit over 4 overflow */
312 case '0': case '1': case '2': case '3':
313 ac = ((ch - '0') << 6);
314 if ((ch = *quoted++) < '0' || '7' < ch)
315 goto error;
316 ac |= ((ch - '0') << 3);
317 if ((ch = *quoted++) < '0' || '7' < ch)
318 goto error;
319 ac |= (ch - '0');
320 ch = ac;
321 break;
322 default:
323 goto error;
324 }
325 strbuf_addch(sb, ch);
326 }
327 error:
329 strbuf_setlen(sb, oldlen);
330 return -1;
331}
332/* quoting as a string literal for other languages */
334void perl_quote_print(FILE *stream, const char *src)
336{
337 const char sq = '\'';
338 const char bq = '\\';
339 char c;
340 fputc(sq, stream);
342 while ((c = *src++)) {
343 if (c == sq || c == bq)
344 fputc(bq, stream);
345 fputc(c, stream);
346 }
347 fputc(sq, stream);
348}
349void python_quote_print(FILE *stream, const char *src)
351{
352 const char sq = '\'';
353 const char bq = '\\';
354 const char nl = '\n';
355 char c;
356 fputc(sq, stream);
358 while ((c = *src++)) {
359 if (c == nl) {
360 fputc(bq, stream);
361 fputc('n', stream);
362 continue;
363 }
364 if (c == sq || c == bq)
365 fputc(bq, stream);
366 fputc(c, stream);
367 }
368 fputc(sq, stream);
369}
370void tcl_quote_print(FILE *stream, const char *src)
372{
373 char c;
374 fputc('"', stream);
376 while ((c = *src++)) {
377 switch (c) {
378 case '[': case ']':
379 case '{': case '}':
380 case '$': case '\\': case '"':
381 fputc('\\', stream);
382 default:
383 fputc(c, stream);
384 break;
385 case '\f':
386 fputs("\\f", stream);
387 break;
388 case '\r':
389 fputs("\\r", stream);
390 break;
391 case '\n':
392 fputs("\\n", stream);
393 break;
394 case '\t':
395 fputs("\\t", stream);
396 break;
397 case '\v':
398 fputs("\\v", stream);
399 break;
400 }
401 }
402 fputc('"', stream);
403}