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6fb737b [PATCH] Make sq_expand() available as sq_quote().
Junio C Hamano authored
1 #include "cache.h"
2 #include "quote.h"
37e8161 @peff quote: provide sq_dequote_to_argv_array
peff authored
3 #include "argv-array.h"
6fb737b [PATCH] Make sq_expand() available as sq_quote().
Junio C Hamano authored
4
5b8e6f8 @dmpot shrink git-shell by avoiding redundant dependencies
dmpot authored
5 int quote_path_fully = 1;
6
6fb737b [PATCH] Make sq_expand() available as sq_quote().
Junio C Hamano authored
7 /* Help to copy the thing properly quoted for the shell safety.
77d604c Enhanced sq_quote()
H. Peter Anvin authored
8 * any single quote is replaced with '\'', any exclamation point
9 * is replaced with '\!', and the whole thing is enclosed in a
6fb737b [PATCH] Make sq_expand() available as sq_quote().
Junio C Hamano authored
10 *
11 * E.g.
12 * original sq_quote result
13 * name ==> name ==> 'name'
14 * a b ==> a b ==> 'a b'
15 * a'b ==> a'\''b ==> 'a'\''b'
77d604c Enhanced sq_quote()
H. Peter Anvin authored
16 * a!b ==> a'\!'b ==> 'a'\!'b'
6fb737b [PATCH] Make sq_expand() available as sq_quote().
Junio C Hamano authored
17 */
35eb2d3 Add git-shell.
Linus Torvalds authored
18 static inline int need_bs_quote(char c)
19 {
20 return (c == '\'' || c == '!');
21 }
22
7a33bcb sq_quote_argv and add_to_string rework with strbuf's.
Pierre Habouzit authored
23 void sq_quote_buf(struct strbuf *dst, const char *src)
77d604c Enhanced sq_quote()
H. Peter Anvin authored
24 {
7a33bcb sq_quote_argv and add_to_string rework with strbuf's.
Pierre Habouzit authored
25 char *to_free = NULL;
26
27 if (dst->buf == src)
b315c5c strbuf change: be sure ->buf is never ever NULL.
Pierre Habouzit authored
28 to_free = strbuf_detach(dst, NULL);
7a33bcb sq_quote_argv and add_to_string rework with strbuf's.
Pierre Habouzit authored
29
30 strbuf_addch(dst, '\'');
31 while (*src) {
c2015b3 Fix an infinite loop in sq_quote_buf().
Johannes Sixt authored
32 size_t len = strcspn(src, "'!");
7a33bcb sq_quote_argv and add_to_string rework with strbuf's.
Pierre Habouzit authored
33 strbuf_add(dst, src, len);
34 src += len;
35 while (need_bs_quote(*src)) {
36 strbuf_addstr(dst, "'\\");
37 strbuf_addch(dst, *src++);
38 strbuf_addch(dst, '\'');
6fb737b [PATCH] Make sq_expand() available as sq_quote().
Junio C Hamano authored
39 }
40 }
7a33bcb sq_quote_argv and add_to_string rework with strbuf's.
Pierre Habouzit authored
41 strbuf_addch(dst, '\'');
42 free(to_free);
77d604c Enhanced sq_quote()
H. Peter Anvin authored
43 }
44
575ba9d @matled GIT_TRACE: show which built-in/external commands are executed
matled authored
45 void sq_quote_print(FILE *stream, const char *src)
46 {
47 char c;
48
49 fputc('\'', stream);
50 while ((c = *src++)) {
51 if (need_bs_quote(c)) {
52 fputs("'\\", stream);
53 fputc(c, stream);
54 fputc('\'', stream);
55 } else {
56 fputc(c, stream);
57 }
58 }
59 fputc('\'', stream);
60 }
61
b319ce4 @chriscool Trace and quote with argv: get rid of unneeded count argument.
chriscool authored
62 void sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
7cf6720 @chriscool Trace into open fd and refactor tracing code.
chriscool authored
63 {
64 int i;
65
66 /* Copy into destination buffer. */
b319ce4 @chriscool Trace and quote with argv: get rid of unneeded count argument.
chriscool authored
67 strbuf_grow(dst, 255);
68 for (i = 0; argv[i]; ++i) {
7a33bcb sq_quote_argv and add_to_string rework with strbuf's.
Pierre Habouzit authored
69 strbuf_addch(dst, ' ');
70 sq_quote_buf(dst, argv[i]);
71 if (maxlen && dst->len > maxlen)
72 die("Too many or long arguments");
7cf6720 @chriscool Trace into open fd and refactor tracing code.
chriscool authored
73 }
86257aa @chriscool Move add_to_string to "quote.c" and make it extern.
chriscool authored
74 }
75
758e915 @gitster quote.c: mark file-local function static
gitster authored
76 static char *sq_dequote_step(char *arg, char **next)
35eb2d3 Add git-shell.
Linus Torvalds authored
77 {
78 char *dst = arg;
79 char *src = arg;
80 char c;
81
82 if (*src != '\'')
83 return NULL;
84 for (;;) {
85 c = *++src;
86 if (!c)
87 return NULL;
88 if (c != '\'') {
89 *dst++ = c;
90 continue;
91 }
92 /* We stepped out of sq */
93 switch (*++src) {
94 case '\0':
95 *dst = 0;
ebbc088 @chriscool quote: implement "sq_dequote_many" to unwrap many args in one string
chriscool authored
96 if (next)
97 *next = NULL;
35eb2d3 Add git-shell.
Linus Torvalds authored
98 return arg;
99 case '\\':
100 c = *++src;
101 if (need_bs_quote(c) && *++src == '\'') {
102 *dst++ = c;
103 continue;
104 }
105 /* Fallthrough */
106 default:
ebbc088 @chriscool quote: implement "sq_dequote_many" to unwrap many args in one string
chriscool authored
107 if (!next || !isspace(*src))
108 return NULL;
109 do {
110 c = *++src;
111 } while (isspace(c));
112 *dst = 0;
113 *next = src;
114 return arg;
35eb2d3 Add git-shell.
Linus Torvalds authored
115 }
116 }
117 }
118
ebbc088 @chriscool quote: implement "sq_dequote_many" to unwrap many args in one string
chriscool authored
119 char *sq_dequote(char *arg)
120 {
121 return sq_dequote_step(arg, NULL);
122 }
123
37e8161 @peff quote: provide sq_dequote_to_argv_array
peff authored
124 static int sq_dequote_to_argv_internal(char *arg,
125 const char ***argv, int *nr, int *alloc,
126 struct argv_array *array)
eaa759b @chriscool quote: add "sq_dequote_to_argv" to put unwrapped args in an argv array
chriscool authored
127 {
128 char *next = arg;
129
130 if (!*arg)
131 return 0;
132 do {
133 char *dequoted = sq_dequote_step(next, &next);
134 if (!dequoted)
135 return -1;
37e8161 @peff quote: provide sq_dequote_to_argv_array
peff authored
136 if (argv) {
137 ALLOC_GROW(*argv, *nr + 1, *alloc);
138 (*argv)[(*nr)++] = dequoted;
139 }
140 if (array)
141 argv_array_push(array, dequoted);
eaa759b @chriscool quote: add "sq_dequote_to_argv" to put unwrapped args in an argv array
chriscool authored
142 } while (next);
143
144 return 0;
145 }
146
37e8161 @peff quote: provide sq_dequote_to_argv_array
peff authored
147 int sq_dequote_to_argv(char *arg, const char ***argv, int *nr, int *alloc)
148 {
149 return sq_dequote_to_argv_internal(arg, argv, nr, alloc, NULL);
150 }
151
152 int sq_dequote_to_argv_array(char *arg, struct argv_array *array)
153 {
154 return sq_dequote_to_argv_internal(arg, NULL, NULL, NULL, array);
155 }
156
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
157 /* 1 means: quote as octal
158 * 0 means: quote as octal if (quote_path_fully)
159 * -1 means: never quote
160 * c: quote as "\\c"
161 */
162 #define X8(x) x, x, x, x, x, x, x, x
163 #define X16(x) X8(x), X8(x)
164 static signed char const sq_lookup[256] = {
165 /* 0 1 2 3 4 5 6 7 */
166 /* 0x00 */ 1, 1, 1, 1, 1, 1, 1, 'a',
167 /* 0x08 */ 'b', 't', 'n', 'v', 'f', 'r', 1, 1,
168 /* 0x10 */ X16(1),
169 /* 0x20 */ -1, -1, '"', -1, -1, -1, -1, -1,
170 /* 0x28 */ X16(-1), X16(-1), X16(-1),
171 /* 0x58 */ -1, -1, -1, -1,'\\', -1, -1, -1,
172 /* 0x60 */ X16(-1), X8(-1),
173 /* 0x78 */ -1, -1, -1, -1, -1, -1, -1, 1,
174 /* 0x80 */ /* set to 0 */
175 };
176
f3fa183 @gitster Style: place opening brace of a function definition at column 1
gitster authored
177 static inline int sq_must_quote(char c)
178 {
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
179 return sq_lookup[(unsigned char)c] + quote_path_fully > 0;
180 }
181
182 /* returns the longest prefix not needing a quote up to maxlen if positive.
183 This stops at the first \0 because it's marked as a character needing an
184 escape */
185 static size_t next_quote_pos(const char *s, ssize_t maxlen)
186 {
187 size_t len;
188 if (maxlen < 0) {
189 for (len = 0; !sq_must_quote(s[len]); len++);
190 } else {
191 for (len = 0; len < maxlen && !sq_must_quote(s[len]); len++);
192 }
193 return len;
194 }
195
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
196 /*
197 * C-style name quoting.
198 *
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
199 * (1) if sb and fp are both NULL, inspect the input name and counts the
200 * number of bytes that are needed to hold c_style quoted version of name,
201 * counting the double quotes around it but not terminating NUL, and
202 * returns it.
203 * However, if name does not need c_style quoting, it returns 0.
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
204 *
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
205 * (2) if sb or fp are not NULL, it emits the c_style quoted version
206 * of name, enclosed with double quotes if asked and needed only.
207 * Return value is the same as in (1).
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
208 */
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
209 static size_t quote_c_style_counted(const char *name, ssize_t maxlen,
210 struct strbuf *sb, FILE *fp, int no_dq)
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
211 {
212 #undef EMIT
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
213 #define EMIT(c) \
214 do { \
215 if (sb) strbuf_addch(sb, (c)); \
216 if (fp) fputc((c), fp); \
217 count++; \
218 } while (0)
219 #define EMITBUF(s, l) \
220 do { \
221 if (sb) strbuf_add(sb, (s), (l)); \
222 if (fp) fwrite((s), (l), 1, fp); \
223 count += (l); \
224 } while (0)
225
226 size_t len, count = 0;
227 const char *p = name;
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
228
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
229 for (;;) {
230 int ch;
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
231
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
232 len = next_quote_pos(p, maxlen);
8424981 @peff Fix invalid read in quote_c_style_counted
peff authored
233 if (len == maxlen || (maxlen < 0 && !p[len]))
50e7b06 @proski [PATCH] quote.c: Make loop control more readable.
proski authored
234 break;
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
235
236 if (!no_dq && p == name)
237 EMIT('"');
238
239 EMITBUF(p, len);
240 EMIT('\\');
241 p += len;
242 ch = (unsigned char)*p++;
8424981 @peff Fix invalid read in quote_c_style_counted
peff authored
243 if (maxlen >= 0)
244 maxlen -= len + 1;
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
245 if (sq_lookup[ch] >= ' ') {
246 EMIT(sq_lookup[ch]);
247 } else {
248 EMIT(((ch >> 6) & 03) + '0');
249 EMIT(((ch >> 3) & 07) + '0');
250 EMIT(((ch >> 0) & 07) + '0');
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
251 }
252 }
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
253
254 EMITBUF(p, len);
255 if (p == name) /* no ending quote needed */
256 return 0;
257
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
258 if (!no_dq)
259 EMIT('"');
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
260 return count;
261 }
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
262
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
263 size_t quote_c_style(const char *name, struct strbuf *sb, FILE *fp, int nodq)
264 {
265 return quote_c_style_counted(name, -1, sb, fp, nodq);
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
266 }
267
d562509 @gitster Fix rewrite_diff() name quoting.
gitster authored
268 void quote_two_c_style(struct strbuf *sb, const char *prefix, const char *path, int nodq)
269 {
270 if (quote_c_style(prefix, NULL, NULL, 0) ||
271 quote_c_style(path, NULL, NULL, 0)) {
272 if (!nodq)
273 strbuf_addch(sb, '"');
274 quote_c_style(prefix, sb, NULL, 1);
275 quote_c_style(path, sb, NULL, 1);
276 if (!nodq)
277 strbuf_addch(sb, '"');
278 } else {
279 strbuf_addstr(sb, prefix);
280 strbuf_addstr(sb, path);
281 }
282 }
283
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
284 void write_name_quoted(const char *name, FILE *fp, int terminator)
9ef2b3c write_name_quoted(): make one of the path a counted string.
Junio C Hamano authored
285 {
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
286 if (terminator) {
287 quote_c_style(name, NULL, fp, 0);
288 } else {
289 fputs(name, fp);
290 }
291 fputc(terminator, fp);
292 }
293
2af202b @torvalds Fix various sparse warnings in the git source code
torvalds authored
294 void write_name_quotedpfx(const char *pfx, size_t pfxlen,
295 const char *name, FILE *fp, int terminator)
663af34 Full rework of quote_c_style and write_name_quoted.
Pierre Habouzit authored
296 {
297 int needquote = 0;
298
299 if (terminator) {
300 needquote = next_quote_pos(pfx, pfxlen) < pfxlen
301 || name[next_quote_pos(name, -1)];
302 }
303 if (needquote) {
304 fputc('"', fp);
305 quote_c_style_counted(pfx, pfxlen, NULL, fp, 1);
306 quote_c_style(name, NULL, fp, 1);
307 fputc('"', fp);
308 } else {
309 fwrite(pfx, pfxlen, 1, fp);
310 fputs(name, fp);
311 }
312 fputc(terminator, fp);
9ef2b3c write_name_quoted(): make one of the path a counted string.
Junio C Hamano authored
313 }
314
b167cff @drizzd quote.c: separate quoting and relative path generation
drizzd authored
315 static const char *path_relative(const char *in, int len,
316 struct strbuf *sb, const char *prefix,
317 int prefix_len);
318
319 void write_name_quoted_relative(const char *name, size_t len,
320 const char *prefix, size_t prefix_len,
321 FILE *fp, int terminator)
a734d0b @dmpot Make private quote_path() in wt-status.c available as quote_path_rela…
dmpot authored
322 {
b167cff @drizzd quote.c: separate quoting and relative path generation
drizzd authored
323 struct strbuf sb = STRBUF_INIT;
324
325 name = path_relative(name, len, &sb, prefix, prefix_len);
326 write_name_quoted(name, fp, terminator);
327
328 strbuf_release(&sb);
329 }
330
331 /*
332 * Give path as relative to prefix.
333 *
334 * The strbuf may or may not be used, so do not assume it contains the
335 * returned path.
336 */
337 static const char *path_relative(const char *in, int len,
338 struct strbuf *sb, const char *prefix,
339 int prefix_len)
340 {
341 int off, i;
a734d0b @dmpot Make private quote_path() in wt-status.c available as quote_path_rela…
dmpot authored
342
343 if (len < 0)
344 len = strlen(in);
0f64bfa @drizzd ls-files: fix pathspec display on error
drizzd authored
345 if (prefix_len < 0) {
346 if (prefix)
347 prefix_len = strlen(prefix);
348 else
349 prefix_len = 0;
350 }
b167cff @drizzd quote.c: separate quoting and relative path generation
drizzd authored
351
352 off = 0;
353 i = 0;
354 while (i < prefix_len && i < len && prefix[i] == in[i]) {
355 if (prefix[i] == '/')
356 off = i + 1;
357 i++;
358 }
359 in += off;
360 len -= off;
361
362 if (i >= prefix_len)
363 return in;
a734d0b @dmpot Make private quote_path() in wt-status.c available as quote_path_rela…
dmpot authored
364
b167cff @drizzd quote.c: separate quoting and relative path generation
drizzd authored
365 strbuf_reset(sb);
366 strbuf_grow(sb, len);
367
368 while (i < prefix_len) {
369 if (prefix[i] == '/')
370 strbuf_addstr(sb, "../");
371 i++;
a734d0b @dmpot Make private quote_path() in wt-status.c available as quote_path_rela…
dmpot authored
372 }
b167cff @drizzd quote.c: separate quoting and relative path generation
drizzd authored
373 strbuf_add(sb, in, len);
374
375 return sb->buf;
376 }
a734d0b @dmpot Make private quote_path() in wt-status.c available as quote_path_rela…
dmpot authored
377
b167cff @drizzd quote.c: separate quoting and relative path generation
drizzd authored
378 /* quote path as relative to the given prefix */
379 char *quote_path_relative(const char *in, int len,
380 struct strbuf *out, const char *prefix)
381 {
382 struct strbuf sb = STRBUF_INIT;
383 const char *rel = path_relative(in, len, &sb, prefix, -1);
384 strbuf_reset(out);
385 quote_c_style_counted(rel, strlen(rel), out, NULL, 0);
386 strbuf_release(&sb);
a734d0b @dmpot Make private quote_path() in wt-status.c available as quote_path_rela…
dmpot authored
387
388 if (!out->len)
389 strbuf_addstr(out, "./");
390
391 return out->buf;
392 }
393
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
394 /*
395 * C-style name unquoting.
396 *
7fb1011 Rework unquote_c_style to work on a strbuf.
Pierre Habouzit authored
397 * Quoted should point at the opening double quote.
398 * + Returns 0 if it was able to unquote the string properly, and appends the
399 * result in the strbuf `sb'.
400 * + Returns -1 in case of error, and doesn't touch the strbuf. Though note
401 * that this function will allocate memory in the strbuf, so calling
402 * strbuf_release is mandatory whichever result unquote_c_style returns.
403 *
404 * Updates endp pointer to point at one past the ending double quote if given.
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
405 */
7fb1011 Rework unquote_c_style to work on a strbuf.
Pierre Habouzit authored
406 int unquote_c_style(struct strbuf *sb, const char *quoted, const char **endp)
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
407 {
7fb1011 Rework unquote_c_style to work on a strbuf.
Pierre Habouzit authored
408 size_t oldlen = sb->len, len;
409 int ch, ac;
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
410
411 if (*quoted++ != '"')
7fb1011 Rework unquote_c_style to work on a strbuf.
Pierre Habouzit authored
412 return -1;
413
414 for (;;) {
415 len = strcspn(quoted, "\"\\");
416 strbuf_add(sb, quoted, len);
417 quoted += len;
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
418
7fb1011 Rework unquote_c_style to work on a strbuf.
Pierre Habouzit authored
419 switch (*quoted++) {
420 case '"':
421 if (endp)
c8744d6 unquote_c_style: fix off-by-one.
Pierre Habouzit authored
422 *endp = quoted;
7fb1011 Rework unquote_c_style to work on a strbuf.
Pierre Habouzit authored
423 return 0;
424 case '\\':
425 break;
426 default:
427 goto error;
428 }
429
430 switch ((ch = *quoted++)) {
431 case 'a': ch = '\a'; break;
432 case 'b': ch = '\b'; break;
433 case 'f': ch = '\f'; break;
434 case 'n': ch = '\n'; break;
435 case 'r': ch = '\r'; break;
436 case 't': ch = '\t'; break;
437 case 'v': ch = '\v'; break;
438
439 case '\\': case '"':
440 break; /* verbatim */
441
442 /* octal values with first digit over 4 overflow */
443 case '0': case '1': case '2': case '3':
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
444 ac = ((ch - '0') << 6);
7fb1011 Rework unquote_c_style to work on a strbuf.
Pierre Habouzit authored
445 if ((ch = *quoted++) < '0' || '7' < ch)
446 goto error;
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
447 ac |= ((ch - '0') << 3);
7fb1011 Rework unquote_c_style to work on a strbuf.
Pierre Habouzit authored
448 if ((ch = *quoted++) < '0' || '7' < ch)
449 goto error;
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
450 ac |= (ch - '0');
451 ch = ac;
452 break;
453 default:
7fb1011 Rework unquote_c_style to work on a strbuf.
Pierre Habouzit authored
454 goto error;
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
455 }
7fb1011 Rework unquote_c_style to work on a strbuf.
Pierre Habouzit authored
456 strbuf_addch(sb, ch);
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
457 }
458
7fb1011 Rework unquote_c_style to work on a strbuf.
Pierre Habouzit authored
459 error:
460 strbuf_setlen(sb, oldlen);
461 return -1;
4f6fbcd Functions to quote and unquote pathnames in C-style.
Junio C Hamano authored
462 }
463
9f613dd Add git-for-each-ref: helper for language bindings
Junio C Hamano authored
464 /* quoting as a string literal for other languages */
465
466 void perl_quote_print(FILE *stream, const char *src)
467 {
468 const char sq = '\'';
469 const char bq = '\\';
470 char c;
471
472 fputc(sq, stream);
473 while ((c = *src++)) {
474 if (c == sq || c == bq)
475 fputc(bq, stream);
476 fputc(c, stream);
477 }
478 fputc(sq, stream);
479 }
480
481 void python_quote_print(FILE *stream, const char *src)
482 {
483 const char sq = '\'';
484 const char bq = '\\';
485 const char nl = '\n';
486 char c;
487
488 fputc(sq, stream);
489 while ((c = *src++)) {
490 if (c == nl) {
491 fputc(bq, stream);
492 fputc('n', stream);
493 continue;
494 }
495 if (c == sq || c == bq)
496 fputc(bq, stream);
497 fputc(c, stream);
498 }
499 fputc(sq, stream);
500 }
5558e55 @spearce Teach for-each-ref about a little language called Tcl.
spearce authored
501
502 void tcl_quote_print(FILE *stream, const char *src)
503 {
504 char c;
505
506 fputc('"', stream);
507 while ((c = *src++)) {
508 switch (c) {
509 case '[': case ']':
510 case '{': case '}':
511 case '$': case '\\': case '"':
512 fputc('\\', stream);
513 default:
514 fputc(c, stream);
515 break;
516 case '\f':
517 fputs("\\f", stream);
518 break;
519 case '\r':
520 fputs("\\r", stream);
521 break;
522 case '\n':
523 fputs("\\n", stream);
524 break;
525 case '\t':
526 fputs("\\t", stream);
527 break;
528 case '\v':
529 fputs("\\v", stream);
530 break;
531 }
532 }
533 fputc('"', stream);
534 }
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