1 /* $NetBSD: str.c,v 1.17 2024/04/24 15:49:03 nia Exp $ */
2
3 /*-
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)str.c 8.1 (Berkeley) 5/31/93";
36 #else
37 __RCSID("$NetBSD: str.c,v 1.17 2024/04/24 15:49:03 nia Exp $");
38 #endif
39 #endif /* not lint */
40
41 #define MALLOC_INCR 128
42
43 /*
44 * tc.str.c: Short string package
45 * This has been a lesson of how to write buggy code!
46 */
47
48 #include <sys/types.h>
49
50 #include <stdarg.h>
51 #include <vis.h>
52
53 #include "csh.h"
54 #include "extern.h"
55
56 #ifdef SHORT_STRINGS
57
58 Char **
blk2short(char ** src)59 blk2short(char **src)
60 {
61 Char **dst, **sdst;
62 size_t n;
63
64 /*
65 * Count
66 */
67 for (n = 0; src[n] != NULL; n++)
68 continue;
69 sdst = dst = xreallocarray(NULL, n + 1, sizeof(*dst));
70
71 for (; *src != NULL; src++)
72 *dst++ = SAVE(*src);
73 *dst = NULL;
74 return (sdst);
75 }
76
77 char **
short2blk(Char * const * src)78 short2blk(Char *const *src)
79 {
80 char **dst, **sdst;
81 size_t n;
82
83 /*
84 * Count
85 */
86 for (n = 0; src[n] != NULL; n++)
87 continue;
88 sdst = dst = xreallocarray(NULL, n + 1, sizeof(*dst));
89
90 for (; *src != NULL; src++)
91 *dst++ = strsave(short2str(*src));
92 *dst = NULL;
93 return (sdst);
94 }
95
96 Char *
str2short(const char * src)97 str2short(const char *src)
98 {
99 static Char *sdst;
100 Char *dst, *edst;
101 static size_t dstsize = 0;
102
103 if (src == NULL)
104 return (NULL);
105
106 if (sdst == (NULL)) {
107 dstsize = MALLOC_INCR;
108 sdst = xreallocarray(NULL, (size_t)dstsize, sizeof(*sdst));
109 }
110
111 dst = sdst;
112 edst = &dst[dstsize];
113 while (*src) {
114 *dst++ = (Char) ((unsigned char) *src++);
115 if (dst == edst) {
116 dstsize += MALLOC_INCR;
117 sdst = xreallocarray(sdst, (size_t)dstsize, sizeof(*sdst));
118 edst = &sdst[dstsize];
119 dst = &edst[-MALLOC_INCR];
120 }
121 }
122 *dst = 0;
123 return (sdst);
124 }
125
126 char *
short2str(const Char * src)127 short2str(const Char *src)
128 {
129 static char *sdst = NULL;
130 static size_t dstsize = 0;
131 char *dst, *edst;
132
133 if (src == NULL)
134 return (NULL);
135
136 if (sdst == NULL) {
137 dstsize = MALLOC_INCR;
138 sdst = xreallocarray(NULL, dstsize, sizeof(*sdst));
139 }
140 dst = sdst;
141 edst = &dst[dstsize];
142 while (*src) {
143 *dst++ = (char) *src++;
144 if (dst == edst) {
145 dstsize += MALLOC_INCR;
146 sdst = xreallocarray(sdst, dstsize, sizeof(*sdst));
147 edst = &sdst[dstsize];
148 dst = &edst[-MALLOC_INCR];
149 }
150 }
151 *dst = 0;
152 return (sdst);
153 }
154
155 Char *
s_strcpy(Char * dst,const Char * src)156 s_strcpy(Char *dst, const Char *src)
157 {
158 Char *sdst;
159
160 sdst = dst;
161 while ((*dst++ = *src++) != '\0')
162 continue;
163 return (sdst);
164 }
165
166 Char *
s_strncpy(Char * dst,const Char * src,size_t n)167 s_strncpy(Char *dst, const Char *src, size_t n)
168 {
169 Char *sdst;
170
171 if (n == 0)
172 return(dst);
173
174 sdst = dst;
175 do
176 if ((*dst++ = *src++) == '\0') {
177 while (--n != 0)
178 *dst++ = '\0';
179 return(sdst);
180 }
181 while (--n != 0);
182 return (sdst);
183 }
184
185 Char *
s_strcat(Char * dst,const Char * src)186 s_strcat(Char *dst, const Char *src)
187 {
188 short *sdst;
189
190 sdst = dst;
191 while (*dst++)
192 continue;
193 --dst;
194 while ((*dst++ = *src++) != '\0')
195 continue;
196 return (sdst);
197 }
198
199 #ifdef NOTUSED
200 Char *
s_strncat(Char * dst,Char * src,size_t n)201 s_strncat(Char *dst, Char *src, size_t n)
202 {
203 Char *sdst;
204
205 if (n == 0)
206 return (dst);
207
208 sdst = dst;
209
210 while (*dst++)
211 continue;
212 --dst;
213
214 do
215 if ((*dst++ = *src++) == '\0')
216 return(sdst);
217 while (--n != 0)
218 continue;
219
220 *dst = '\0';
221 return (sdst);
222 }
223
224 #endif
225
226 Char *
s_strchr(const Char * str,int ch)227 s_strchr(const Char *str, int ch)
228 {
229 do
230 if (*str == ch)
231 return __UNCONST(str);
232 while (*str++);
233 return (NULL);
234 }
235
236 Char *
s_strrchr(const Char * str,int ch)237 s_strrchr(const Char *str, int ch)
238 {
239 const Char *rstr;
240
241 rstr = NULL;
242 do
243 if (*str == ch)
244 rstr = str;
245 while (*str++);
246 return __UNCONST(rstr);
247 }
248
249 size_t
s_strlen(const Char * str)250 s_strlen(const Char *str)
251 {
252 size_t n;
253
254 for (n = 0; *str++; n++)
255 continue;
256 return (n);
257 }
258
259 int
s_strcmp(const Char * str1,const Char * str2)260 s_strcmp(const Char *str1, const Char *str2)
261 {
262 for (; *str1 && *str1 == *str2; str1++, str2++)
263 continue;
264 /*
265 * The following case analysis is necessary so that characters which look
266 * negative collate low against normal characters but high against the
267 * end-of-string NUL.
268 */
269 if (*str1 == '\0' && *str2 == '\0')
270 return (0);
271 else if (*str1 == '\0')
272 return (-1);
273 else if (*str2 == '\0')
274 return (1);
275 else
276 return (*str1 - *str2);
277 }
278
279 int
s_strncmp(const Char * str1,const Char * str2,size_t n)280 s_strncmp(const Char *str1, const Char *str2, size_t n)
281 {
282 if (n == 0)
283 return (0);
284 do {
285 if (*str1 != *str2) {
286 /*
287 * The following case analysis is necessary so that characters
288 * which look negative collate low against normal characters
289 * but high against the end-of-string NUL.
290 */
291 if (*str1 == '\0')
292 return (-1);
293 else if (*str2 == '\0')
294 return (1);
295 else
296 return (*str1 - *str2);
297 }
298 if (*str1 == '\0')
299 return(0);
300 str1++, str2++;
301 } while (--n != 0);
302 return(0);
303 }
304
305 Char *
s_strsave(const Char * s)306 s_strsave(const Char *s)
307 {
308 const Char *p;
309 Char *n;
310
311 if (s == 0)
312 s = STRNULL;
313 for (p = s; *p++;)
314 continue;
315 p = n = xreallocarray(NULL, (size_t)(p - s), sizeof(*n));
316 while ((*n++ = *s++) != '\0')
317 continue;
318 return __UNCONST(p);
319 }
320
321 Char *
s_strspl(const Char * cp,const Char * dp)322 s_strspl(const Char *cp, const Char *dp)
323 {
324 Char *ep, *d;
325 const Char *p, *q;
326
327 if (!cp)
328 cp = STRNULL;
329 if (!dp)
330 dp = STRNULL;
331 for (p = cp; *p++;)
332 continue;
333 for (q = dp; *q++;)
334 continue;
335 ep = xreallocarray(NULL, (size_t)((p - cp) + (q - dp) - 1), sizeof(*ep));
336 for (d = ep, q = cp; (*d++ = *q++) != '\0';)
337 continue;
338 for (d--, q = dp; (*d++ = *q++) != '\0';)
339 continue;
340 return (ep);
341 }
342
343 Char *
s_strend(const Char * cp)344 s_strend(const Char *cp)
345 {
346 if (!cp)
347 return __UNCONST(cp);
348 while (*cp)
349 cp++;
350 return __UNCONST(cp);
351 }
352
353 Char *
s_strstr(const Char * s,const Char * t)354 s_strstr(const Char *s, const Char *t)
355 {
356 do {
357 const Char *ss = s;
358 const Char *tt = t;
359
360 do
361 if (*tt == '\0')
362 return __UNCONST(s);
363 while (*ss++ == *tt++);
364 } while (*s++ != '\0');
365 return (NULL);
366 }
367 #endif /* SHORT_STRINGS */
368
369 char *
short2qstr(const Char * src)370 short2qstr(const Char *src)
371 {
372 static char *sdst = NULL;
373 static size_t dstsize = 0;
374 char *dst, *edst;
375
376 if (src == NULL)
377 return (NULL);
378
379 if (sdst == NULL) {
380 dstsize = MALLOC_INCR;
381 sdst = xreallocarray(NULL, dstsize, sizeof(*sdst));
382 }
383 dst = sdst;
384 edst = &dst[dstsize];
385 while (*src) {
386
387 if (*src & QUOTE) {
388 *dst++ = '\\';
389 if (dst == edst) {
390 dstsize += MALLOC_INCR;
391 sdst = xreallocarray(sdst, (size_t)dstsize, sizeof(*sdst));
392 edst = &sdst[dstsize];
393 dst = &edst[-MALLOC_INCR];
394 }
395 }
396 *dst++ = (char) *src++;
397 if (dst == edst) {
398 dstsize += MALLOC_INCR;
399 sdst = xreallocarray(sdst, (size_t)dstsize, sizeof(*sdst));
400 edst = &sdst[dstsize];
401 dst = &edst[-MALLOC_INCR];
402 }
403 }
404 *dst = 0;
405 return (sdst);
406 }
407
408 /*
409 * XXX: Should we worry about QUOTE'd chars?
410 */
411 char *
vis_str(const Char * cp)412 vis_str(const Char *cp)
413 {
414 static char *sdst = NULL;
415 static size_t dstsize = 0;
416 const Char *dp;
417 size_t n;
418
419 if (cp == NULL)
420 return (NULL);
421
422 for (dp = cp; *dp++;)
423 continue;
424 n = ((size_t)(dp - cp) << 2) + 1; /* 4 times + NULL */
425 if (dstsize < n) {
426 sdst = (dstsize ?
427 xreallocarray(sdst, (size_t)n, sizeof(*sdst)) :
428 xreallocarray(NULL, (size_t)n, sizeof(*sdst)));
429 dstsize = n;
430 }
431 /*
432 * XXX: When we are in AsciiOnly we want all characters >= 0200 to
433 * be encoded, but currently there is no way in vis to do that.
434 */
435 (void)strvis(sdst, short2str(cp), VIS_NOSLASH);
436 return (sdst);
437 }
438