source: trunk/src/kmk/str.c@ 14

Last change on this file since 14 was 9, checked in by bird, 23 years ago

Initial revision
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File size: 10.9 KB
Line 
1/*-
2 * Copyright (c) 1988, 1989, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 1989 by Berkeley Softworks
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Adam de Boor.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)str.c 5.8 (Berkeley) 6/1/90
39 */
40
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: src/usr.bin/make/str.c,v 1.25 2002/10/09 03:42:10 jmallett Exp $");
43
44#include "make.h"
45
46static char **argv, *buffer;
47static int argmax, curlen;
48
49/*
50 * str_init --
51 * Initialize the strings package
52 *
53 */
54void
55str_init(void)
56{
57 char *p1;
58 argv = (char **)emalloc(((argmax = 50) + 1) * sizeof(char *));
59 argv[0] = Var_Value(".MAKE", VAR_GLOBAL, &p1);
60}
61
62
63/*
64 * str_end --
65 * Cleanup the strings package
66 *
67 */
68void
69str_end(void)
70{
71 if (argv) {
72 if (argv[0])
73 free(argv[0]);
74 free(argv);
75 }
76 if (buffer)
77 free(buffer);
78}
79
80/*-
81 * str_concat --
82 * concatenate the two strings, inserting a space or slash between them,
83 * freeing them if requested.
84 *
85 * returns --
86 * the resulting string in allocated space.
87 */
88char *
89str_concat(char *s1, char *s2, int flags)
90{
91 int len1, len2;
92 char *result;
93
94 /* get the length of both strings */
95 len1 = strlen(s1);
96 len2 = strlen(s2);
97
98 /* allocate length plus separator plus EOS */
99 result = emalloc((u_int)(len1 + len2 + 2));
100
101 /* copy first string into place */
102 memcpy(result, s1, len1);
103
104 /* add separator character */
105 if (flags & STR_ADDSPACE) {
106 result[len1] = ' ';
107 ++len1;
108 } else if (flags & STR_ADDSLASH) {
109 result[len1] = '/';
110 ++len1;
111 }
112
113 /* copy second string plus EOS into place */
114 memcpy(result + len1, s2, len2 + 1);
115
116 /* free original strings */
117 if (flags & STR_DOFREE) {
118 (void)efree(s1);
119 (void)efree(s2);
120 }
121 return(result);
122}
123
124/*-
125 * brk_string --
126 * Fracture a string into an array of words (as delineated by tabs or
127 * spaces) taking quotation marks into account. Leading tabs/spaces
128 * are ignored.
129 *
130 * returns --
131 * Pointer to the array of pointers to the words. To make life easier,
132 * the first word is always the value of the .MAKE variable.
133 */
134char **
135brk_string(char *str, int *store_argc, Boolean expand)
136{
137 int argc, ch;
138 char inquote, *p, *start, *t;
139 int len;
140
141 /* skip leading space chars. */
142 for (; *str == ' ' || *str == '\t'; ++str)
143 continue;
144
145 /* allocate room for a copy of the string */
146 if ((len = strlen(str) + 1) > curlen) {
147 if (buffer)
148 free(buffer);
149 buffer = emalloc(curlen = len);
150 }
151
152 /*
153 * copy the string; at the same time, parse backslashes,
154 * quotes and build the argument list.
155 */
156 argc = 1;
157 inquote = '\0';
158 for (p = str, start = t = buffer;; ++p) {
159 switch(ch = *p) {
160 case '"':
161 case '\'':
162 if (inquote) {
163 if (inquote == ch)
164 inquote = '\0';
165 else
166 break;
167 } else {
168 inquote = (char) ch;
169 /* Don't miss "" or '' */
170 if (start == NULL && p[1] == inquote) {
171 start = t + 1;
172 break;
173 }
174 }
175 if (!expand) {
176 if (!start)
177 start = t;
178 *t++ = ch;
179 }
180 continue;
181 case ' ':
182 case '\t':
183 case '\n':
184 if (inquote)
185 break;
186 if (!start)
187 continue;
188 /* FALLTHROUGH */
189 case '\0':
190 /*
191 * end of a token -- make sure there's enough argv
192 * space and save off a pointer.
193 */
194 if (!start)
195 goto done;
196
197 *t++ = '\0';
198 if (argc == argmax) {
199 argmax *= 2; /* ramp up fast */
200 argv = (char **)erealloc(argv,
201 (argmax + 1) * sizeof(char *));
202 }
203 argv[argc++] = start;
204 start = (char *)NULL;
205 if (ch == '\n' || ch == '\0')
206 goto done;
207 continue;
208 case '\\':
209 if (!expand) {
210 if (!start)
211 start = t;
212 *t++ = '\\';
213 ch = *++p;
214 break;
215 }
216
217 switch (ch = *++p) {
218 case '\0':
219 case '\n':
220 /* hmmm; fix it up as best we can */
221 ch = '\\';
222 --p;
223 break;
224 case 'b':
225 ch = '\b';
226 break;
227 case 'f':
228 ch = '\f';
229 break;
230 case 'n':
231 ch = '\n';
232 break;
233 case 'r':
234 ch = '\r';
235 break;
236 case 't':
237 ch = '\t';
238 break;
239 default:
240 break;
241 }
242 break;
243 default:
244 break;
245 }
246 if (!start)
247 start = t;
248 *t++ = (char) ch;
249 }
250done: argv[argc] = (char *)NULL;
251 *store_argc = argc;
252 return(argv);
253}
254
255/*
256 * Str_FindSubstring -- See if a string contains a particular substring.
257 *
258 * Results: If string contains substring, the return value is the location of
259 * the first matching instance of substring in string. If string doesn't
260 * contain substring, the return value is NULL. Matching is done on an exact
261 * character-for-character basis with no wildcards or special characters.
262 *
263 * Side effects: None.
264 *
265 * XXX should be strstr(3).
266 */
267char *
268Str_FindSubstring(char *string, char *substring)
269{
270 char *a, *b;
271
272 /*
273 * First scan quickly through the two strings looking for a single-
274 * character match. When it's found, then compare the rest of the
275 * substring.
276 */
277
278 for (b = substring; *string != 0; string += 1) {
279 if (*string != *b)
280 continue;
281 a = string;
282 for (;;) {
283 if (*b == 0)
284 return(string);
285 if (*a++ != *b++)
286 break;
287 }
288 b = substring;
289 }
290 return((char *) NULL);
291}
292
293/*
294 * Str_Match --
295 *
296 * See if a particular string matches a particular pattern.
297 *
298 * Results: Non-zero is returned if string matches pattern, 0 otherwise. The
299 * matching operation permits the following special characters in the
300 * pattern: *?\[] (see the man page for details on what these mean).
301 *
302 * Side effects: None.
303 */
304int
305Str_Match(char *string, char *pattern)
306{
307 char c2;
308
309 for (;;) {
310 /*
311 * See if we're at the end of both the pattern and the
312 * string. If, we succeeded. If we're at the end of the
313 * pattern but not at the end of the string, we failed.
314 */
315 if (*pattern == 0)
316 return(!*string);
317 if (*string == 0 && *pattern != '*')
318 return(0);
319 /*
320 * Check for a "*" as the next pattern character. It matches
321 * any substring. We handle this by calling ourselves
322 * recursively for each postfix of string, until either we
323 * match or we reach the end of the string.
324 */
325 if (*pattern == '*') {
326 pattern += 1;
327 if (*pattern == 0)
328 return(1);
329 while (*string != 0) {
330 if (Str_Match(string, pattern))
331 return(1);
332 ++string;
333 }
334 return(0);
335 }
336 /*
337 * Check for a "?" as the next pattern character. It matches
338 * any single character.
339 */
340 if (*pattern == '?')
341 goto thisCharOK;
342 /*
343 * Check for a "[" as the next pattern character. It is
344 * followed by a list of characters that are acceptable, or
345 * by a range (two characters separated by "-").
346 */
347 if (*pattern == '[') {
348 ++pattern;
349 for (;;) {
350 if ((*pattern == ']') || (*pattern == 0))
351 return(0);
352 if (*pattern == *string)
353 break;
354 if (pattern[1] == '-') {
355 c2 = pattern[2];
356 if (c2 == 0)
357 return(0);
358 if ((*pattern <= *string) &&
359 (c2 >= *string))
360 break;
361 if ((*pattern >= *string) &&
362 (c2 <= *string))
363 break;
364 pattern += 2;
365 }
366 ++pattern;
367 }
368 while ((*pattern != ']') && (*pattern != 0))
369 ++pattern;
370 goto thisCharOK;
371 }
372 /*
373 * If the next pattern character is '/', just strip off the
374 * '/' so we do exact matching on the character that follows.
375 */
376 if (*pattern == '\\') {
377 ++pattern;
378 if (*pattern == 0)
379 return(0);
380 }
381 /*
382 * There's no special character. Just make sure that the
383 * next characters of each string match.
384 */
385 if (*pattern != *string)
386 return(0);
387thisCharOK: ++pattern;
388 ++string;
389 }
390}
391
392
393/*-
394 *-----------------------------------------------------------------------
395 * Str_SYSVMatch --
396 * Check word against pattern for a match (% is wild),
397 *
398 * Results:
399 * Returns the beginning position of a match or null. The number
400 * of characters matched is returned in len.
401 *
402 * Side Effects:
403 * None
404 *
405 *-----------------------------------------------------------------------
406 */
407char *
408Str_SYSVMatch(char *word, char *pattern, int *len)
409{
410 char *p = pattern;
411 char *w = word;
412 char *m;
413
414 if (*w == '\0') {
415 /* Zero-length word cannot be matched against */
416 *len = 0;
417 return NULL;
418 }
419
420 if (*p == '\0') {
421 /* Null pattern is the whole string */
422 *len = strlen(w);
423 return w;
424 }
425
426 if ((m = strchr(p, '%')) != NULL) {
427 /* check that the prefix matches */
428 for (; p != m && *w && *w == *p; w++, p++)
429 continue;
430
431 if (p != m)
432 return NULL; /* No match */
433
434 if (*++p == '\0') {
435 /* No more pattern, return the rest of the string */
436 *len = strlen(w);
437 return w;
438 }
439 }
440
441 m = w;
442
443 /* Find a matching tail */
444 do
445 if (strcmp(p, w) == 0) {
446 *len = w - m;
447 return m;
448 }
449 while (*w++ != '\0');
450
451 return NULL;
452}
453
454
455/*-
456 *-----------------------------------------------------------------------
457 * Str_SYSVSubst --
458 * Substitute '%' on the pattern with len characters from src.
459 * If the pattern does not contain a '%' prepend len characters
460 * from src.
461 *
462 * Results:
463 * None
464 *
465 * Side Effects:
466 * Places result on buf
467 *
468 *-----------------------------------------------------------------------
469 */
470void
471Str_SYSVSubst(Buffer buf, char *pat, char *src, int len)
472{
473 char *m;
474
475 if ((m = strchr(pat, '%')) != NULL) {
476 /* Copy the prefix */
477 Buf_AddBytes(buf, m - pat, (Byte *) pat);
478 /* skip the % */
479 pat = m + 1;
480 }
481
482 /* Copy the pattern */
483 Buf_AddBytes(buf, len, (Byte *) src);
484
485 /* append the rest */
486 Buf_AddBytes(buf, strlen(pat), (Byte *) pat);
487}
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