source: trunk/src/kmk/str.c@ 162

Last change on this file since 162 was 51, checked in by bird, 23 years ago

kMk and porting to kLib.
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File size: 16.0 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
39#ifndef lint
40#if 0
41static char sccsid[] = "@(#)str.c 5.8 (Berkeley) 6/1/90";
42#else
43static const char rcsid[] =
44 "$FreeBSD: src/usr.bin/make/str.c,v 1.12.2.1 2002/06/17 04:30:48 jmallett Exp $";
45#endif
46#define KLIBFILEDEF rcsid
47#endif /* not lint */
48
49#include "make.h"
50
51static char **argv, *buffer;
52static int argmax, curlen;
53
54/*
55 * str_init --
56 * Initialize the strings package
57 *
58 */
59void
60str_init()
61{
62 char *p1;
63 argv = (char **)emalloc(((argmax = 50) + 1) * sizeof(char *));
64 argv[0] = Var_Value(".MAKE", VAR_GLOBAL, &p1);
65}
66
67
68/*
69 * str_end --
70 * Cleanup the strings package
71 *
72 */
73void
74str_end()
75{
76 if (argv) {
77 if (argv[0])
78 efree(argv[0]);
79 efree((Address) argv);
80 }
81 if (buffer)
82 efree(buffer);
83}
84
85/*-
86 * str_concat --
87 * concatenate the two strings, inserting a space or slash between them,
88 * freeing them if requested.
89 *
90 * returns --
91 * the resulting string in allocated space.
92 */
93char *
94str_concat(s1, s2, flags)
95 char *s1, *s2;
96 int flags;
97{
98 register int len1, len2;
99 register char *result;
100
101 /* get the length of both strings */
102 len1 = strlen(s1);
103 len2 = strlen(s2);
104
105 /* allocate length plus separator plus EOS */
106 result = emalloc((u_int)(len1 + len2 + 2));
107
108 /* copy first string into place */
109 memcpy(result, s1, len1);
110
111 /* add separator character */
112 if (flags & STR_ADDSPACE) {
113 result[len1] = ' ';
114 ++len1;
115 } else if (flags & STR_ADDSLASH) {
116 result[len1] = '/';
117 ++len1;
118 }
119
120 /* copy second string plus EOS into place */
121 memcpy(result + len1, s2, len2 + 1);
122
123 /* efree original strings */
124 if (flags & STR_DOFREE) {
125 (void)efree(s1);
126 (void)efree(s2);
127 }
128 return(result);
129}
130
131/*-
132 * brk_string --
133 * Fracture a string into an array of words (as delineated by tabs or
134 * spaces) taking quotation marks into account. Leading tabs/spaces
135 * are ignored.
136 *
137 * returns --
138 * Pointer to the array of pointers to the words. To make life easier,
139 * the first word is always the value of the .MAKE variable.
140 */
141char **
142brk_string(str, store_argc, expand)
143 register char *str;
144 int *store_argc;
145 Boolean expand;
146{
147 register int argc, ch;
148 register char inquote, *p, *start, *t;
149 int len;
150
151 /* skip leading space chars. */
152 for (; *str == ' ' || *str == '\t'; ++str)
153 continue;
154
155 /* allocate room for a copy of the string */
156 if ((len = strlen(str) + 1) > curlen) {
157 if (buffer)
158 efree(buffer);
159 buffer = emalloc(curlen = len);
160 }
161
162 /*
163 * copy the string; at the same time, parse backslashes,
164 * quotes and build the argument list.
165 */
166 argc = 1;
167 inquote = '\0';
168 for (p = str, start = t = buffer;; ++p) {
169 switch(ch = *p) {
170 case '"':
171 case '\'':
172 if (inquote) {
173 if (inquote == ch)
174 inquote = '\0';
175 else
176 break;
177 } else {
178 inquote = (char) ch;
179 /* Don't miss "" or '' */
180 if (start == NULL && p[1] == inquote) {
181 start = t + 1;
182 break;
183 }
184 }
185 if (!expand) {
186 if (!start)
187 start = t;
188 *t++ = ch;
189 }
190 continue;
191 case ' ':
192 case '\t':
193 case '\n':
194 if (inquote)
195 break;
196 if (!start)
197 continue;
198 /* FALLTHROUGH */
199 case '\0':
200 /*
201 * end of a token -- make sure there's enough argv
202 * space and save off a pointer.
203 */
204 if (!start)
205 goto done;
206
207 *t++ = '\0';
208 if (argc == argmax) {
209 argmax *= 2; /* ramp up fast */
210 argv = (char **)erealloc(argv,
211 (argmax + 1) * sizeof(char *));
212 }
213 argv[argc++] = start;
214 start = (char *)NULL;
215 if (ch == '\n' || ch == '\0')
216 goto done;
217 continue;
218 case '\\':
219 if (!expand) {
220 if (!start)
221 start = t;
222 *t++ = '\\';
223 ch = *++p;
224 break;
225 }
226
227 switch (ch = *++p) {
228 case '\0':
229 case '\n':
230 /* hmmm; fix it up as best we can */
231 ch = '\\';
232 --p;
233 break;
234 case 'b':
235 ch = '\b';
236 break;
237 case 'f':
238 ch = '\f';
239 break;
240 case 'n':
241 ch = '\n';
242 break;
243 case 'r':
244 ch = '\r';
245 break;
246 case 't':
247 ch = '\t';
248 break;
249 }
250 break;
251 }
252 if (!start)
253 start = t;
254 *t++ = (char) ch;
255 }
256done: argv[argc] = (char *)NULL;
257 *store_argc = argc;
258 return(argv);
259}
260
261/*
262 * Str_FindSubstring -- See if a string contains a particular substring.
263 *
264 * Results: If string contains substring, the return value is the location of
265 * the first matching instance of substring in string. If string doesn't
266 * contain substring, the return value is NULL. Matching is done on an exact
267 * character-for-character basis with no wildcards or special characters.
268 *
269 * Side effects: None.
270 */
271char *
272Str_FindSubstring(string, substring)
273 register char *string; /* String to search. */
274 char *substring; /* Substring to find in string */
275{
276 register char *a, *b;
277
278 /*
279 * First scan quickly through the two strings looking for a single-
280 * character match. When it's found, then compare the rest of the
281 * substring.
282 */
283
284 for (b = substring; *string != 0; string += 1) {
285 if (*string != *b)
286 continue;
287 a = string;
288 for (;;) {
289 if (*b == 0)
290 return(string);
291 if (*a++ != *b++)
292 break;
293 }
294 b = substring;
295 }
296 return((char *) NULL);
297}
298
299/*
300 * Str_Match --
301 *
302 * See if a particular string matches a particular pattern.
303 *
304 * Results: Non-zero is returned if string matches pattern, 0 otherwise. The
305 * matching operation permits the following special characters in the
306 * pattern: *?\[] (see the man page for details on what these mean).
307 *
308 * Side effects: None.
309 */
310int
311Str_Match(string, pattern)
312 register char *string; /* String */
313 register char *pattern; /* Pattern */
314{
315 char c2;
316
317 for (;;) {
318 /*
319 * See if we're at the end of both the pattern and the
320 * string. If, we succeeded. If we're at the end of the
321 * pattern but not at the end of the string, we failed.
322 */
323 if (*pattern == 0)
324 return(!*string);
325 if (*string == 0 && *pattern != '*')
326 return(0);
327 /*
328 * Check for a "*" as the next pattern character. It matches
329 * any substring. We handle this by calling ourselves
330 * recursively for each postfix of string, until either we
331 * match or we reach the end of the string.
332 */
333 if (*pattern == '*') {
334 pattern += 1;
335 if (*pattern == 0)
336 return(1);
337 while (*string != 0) {
338 if (Str_Match(string, pattern))
339 return(1);
340 ++string;
341 }
342 return(0);
343 }
344 /*
345 * Check for a "?" as the next pattern character. It matches
346 * any single character.
347 */
348 if (*pattern == '?')
349 goto thisCharOK;
350 /*
351 * Check for a "[" as the next pattern character. It is
352 * followed by a list of characters that are acceptable, or
353 * by a range (two characters separated by "-").
354 */
355 if (*pattern == '[') {
356 ++pattern;
357 for (;;) {
358 if ((*pattern == ']') || (*pattern == 0))
359 return(0);
360 if (*pattern == *string)
361 break;
362 if (pattern[1] == '-') {
363 c2 = pattern[2];
364 if (c2 == 0)
365 return(0);
366 if ((*pattern <= *string) &&
367 (c2 >= *string))
368 break;
369 if ((*pattern >= *string) &&
370 (c2 <= *string))
371 break;
372 pattern += 2;
373 }
374 ++pattern;
375 }
376 while ((*pattern != ']') && (*pattern != 0))
377 ++pattern;
378 goto thisCharOK;
379 }
380 /*
381 * If the next pattern character is '/', just strip off the
382 * '/' so we do exact matching on the character that follows.
383 */
384 if (*pattern == '\\') {
385 ++pattern;
386 if (*pattern == 0)
387 return(0);
388 }
389 /*
390 * There's no special character. Just make sure that the
391 * next characters of each string match.
392 */
393 if (*pattern != *string)
394 return(0);
395thisCharOK: ++pattern;
396 ++string;
397 }
398}
399
400
401/*-
402 *-----------------------------------------------------------------------
403 * Str_SYSVMatch --
404 * Check word against pattern for a match (% is wild),
405 *
406 * Results:
407 * Returns the beginning position of a match or null. The number
408 * of characters matched is returned in len.
409 *
410 * Side Effects:
411 * None
412 *
413 *-----------------------------------------------------------------------
414 */
415char *
416Str_SYSVMatch(word, pattern, len)
417 char *word; /* Word to examine */
418 char *pattern; /* Pattern to examine against */
419 int *len; /* Number of characters to substitute */
420{
421 char *p = pattern;
422 char *w = word;
423 char *m;
424
425 if (*w == '\0') {
426 /* Zero-length word cannot be matched against */
427 *len = 0;
428 return NULL;
429 }
430
431 if (*p == '\0') {
432 /* Null pattern is the whole string */
433 *len = strlen(w);
434 return w;
435 }
436
437 if ((m = strchr(p, '%')) != NULL) {
438 /* check that the prefix matches */
439 for (; p != m && *w && *w == *p; w++, p++)
440 continue;
441
442 if (p != m)
443 return NULL; /* No match */
444
445 if (*++p == '\0') {
446 /* No more pattern, return the rest of the string */
447 *len = strlen(w);
448 return w;
449 }
450 }
451
452 m = w;
453
454 /* Find a matching tail */
455 do
456 if (strcmp(p, w) == 0) {
457 *len = w - m;
458 return m;
459 }
460 while (*w++ != '\0');
461
462 return NULL;
463}
464
465
466/*-
467 *-----------------------------------------------------------------------
468 * Str_SYSVSubst --
469 * Substitute '%' on the pattern with len characters from src.
470 * If the pattern does not contain a '%' prepend len characters
471 * from src.
472 *
473 * Results:
474 * None
475 *
476 * Side Effects:
477 * Places result on buf
478 *
479 *-----------------------------------------------------------------------
480 */
481void
482Str_SYSVSubst(buf, pat, src, len)
483 Buffer buf;
484 char *pat;
485 char *src;
486 int len;
487{
488 char *m;
489
490 if ((m = strchr(pat, '%')) != NULL) {
491 /* Copy the prefix */
492 Buf_AddBytes(buf, m - pat, (Byte *) pat);
493 /* skip the % */
494 pat = m + 1;
495 }
496
497 /* Copy the pattern */
498 Buf_AddBytes(buf, len, (Byte *) src);
499
500 /* append the rest */
501 Buf_AddBytes(buf, strlen(pat), (Byte *) pat);
502}
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