usr.bin/make/str.c

   1 /*      $NetBSD: str.c,v 1.34 2012/03/03 23:16:47 dholland Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1988, 1989, 1990, 1993
   5  *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 /*-
  36  * Copyright (c) 1989 by Berkeley Softworks
  37  * All rights reserved.
  38  *
  39  * This code is derived from software contributed to Berkeley by
  40  * Adam de Boor.
  41  *
  42  * Redistribution and use in source and binary forms, with or without
  43  * modification, are permitted provided that the following conditions
  44  * are met:
  45  * 1. Redistributions of source code must retain the above copyright
  46  *    notice, this list of conditions and the following disclaimer.
  47  * 2. Redistributions in binary form must reproduce the above copyright
  48  *    notice, this list of conditions and the following disclaimer in the
  49  *    documentation and/or other materials provided with the distribution.
  50  * 3. All advertising materials mentioning features or use of this software
  51  *    must display the following acknowledgement:
  52  *      This product includes software developed by the University of
  53  *      California, Berkeley and its contributors.
  54  * 4. Neither the name of the University nor the names of its contributors
  55  *    may be used to endorse or promote products derived from this software
  56  *    without specific prior written permission.
  57  *
  58  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  59  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  60  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  61  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  62  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  63  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  64  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  65  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  66  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  67  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  68  * SUCH DAMAGE.
  69  */
  70
  71 #ifndef MAKE_NATIVE
  72 static char rcsid[] = "$NetBSD: str.c,v 1.34 2012/03/03 23:16:47 dholland Exp $";
  73 #else
  74 #include <sys/cdefs.h>
  75 #ifndef lint
  76 #if 0
  77 static char     sccsid[] = "@(#)str.c   5.8 (Berkeley) 6/1/90";
  78 #else
  79 __RCSID("$NetBSD: str.c,v 1.34 2012/03/03 23:16:47 dholland Exp $");
  80 #endif
  81 #endif                          /* not lint */
  82 #endif
  83
  84 #include "make.h"
  85
  86 /*-
  87  * str_concat --
  88  *      concatenate the two strings, inserting a space or slash between them,
  89  *      freeing them if requested.
  90  *
  91  * returns --
  92  *      the resulting string in allocated space.
  93  */
  94 char *
  95 str_concat(const char *s1, const char *s2, int flags)
  96 {
  97         int len1, len2;
  98         char *result;
  99
 100         /* get the length of both strings */
 101         len1 = strlen(s1);
 102         len2 = strlen(s2);
 103
 104         /* allocate length plus separator plus EOS */
 105         result = bmake_malloc((u_int)(len1 + len2 + 2));
 106
 107         /* copy first string into place */
 108         memcpy(result, s1, len1);
 109
 110         /* add separator character */
 111         if (flags & STR_ADDSPACE) {
 112                 result[len1] = ' ';
 113                 ++len1;
 114         } else if (flags & STR_ADDSLASH) {
 115                 result[len1] = '/';
 116                 ++len1;
 117         }
 118
 119         /* copy second string plus EOS into place */
 120         memcpy(result + len1, s2, len2 + 1);
 121
 122         return(result);
 123 }
 124
 125 /*-
 126  * brk_string --
 127  *      Fracture a string into an array of words (as delineated by tabs or
 128  *      spaces) taking quotation marks into account.  Leading tabs/spaces
 129  *      are ignored.
 130  *
 131  * If expand is TRUE, quotes are removed and escape sequences
 132  *  such as \r, \t, etc... are expanded.
 133  *
 134  * returns --
 135  *      Pointer to the array of pointers to the words.
 136  *      Memory containing the actual words in *buffer.
 137  *              Both of these must be free'd by the caller.
 138  *      Number of words in *store_argc.
 139  */
 140 char **
 141 brk_string(const char *str, int *store_argc, Boolean expand, char **buffer)
 142 {
 143         int argc, ch;
 144         char inquote, *start, *t;
 145         const char *p;
 146         int len;
 147         int argmax = 50, curlen = 0;
 148         char **argv = bmake_malloc((argmax + 1) * sizeof(char *));
 149
 150         /* skip leading space chars. */
 151         for (; *str == ' ' || *str == '\t'; ++str)
 152                 continue;
 153
 154         /* allocate room for a copy of the string */
 155         if ((len = strlen(str) + 1) > curlen)
 156                 *buffer = bmake_malloc(curlen = len);
 157
 158         /*
 159          * copy the string; at the same time, parse backslashes,
 160          * quotes and build the argument list.
 161          */
 162         argc = 0;
 163         inquote = '\0';
 164         for (p = str, start = t = *buffer;; ++p) {
 165                 switch(ch = *p) {
 166                 case '"':
 167                 case '\'':
 168                         if (inquote) {
 169                                 if (inquote == ch)
 170                                         inquote = '\0';
 171                                 else
 172                                         break;
 173                         }
 174                         else {
 175                                 inquote = (char) ch;
 176                                 /* Don't miss "" or '' */
 177                                 if (start == NULL && p[1] == inquote) {
 178                                         if (!expand) {
 179                                                 start = t;
 180                                                 *t++ = ch;
 181                                         } else
 182                                                 start = t + 1;
 183                                         p++;
 184                                         inquote = '\0';
 185                                         break;
 186                                 }
 187                         }
 188                         if (!expand) {
 189                                 if (!start)
 190                                         start = t;
 191                                 *t++ = ch;
 192                         }
 193                         continue;
 194                 case ' ':
 195                 case '\t':
 196                 case '\n':
 197                         if (inquote)
 198                                 break;
 199                         if (!start)
 200                                 continue;
 201                         /* FALLTHROUGH */
 202                 case '\0':
 203                         /*
 204                          * end of a token -- make sure there's enough argv
 205                          * space and save off a pointer.
 206                          */
 207                         if (!start)
 208                             goto done;
 209
 210                         *t++ = '\0';
 211                         if (argc == argmax) {
 212                                 argmax *= 2;            /* ramp up fast */
 213                                 argv = (char **)bmake_realloc(argv,
 214                                     (argmax + 1) * sizeof(char *));
 215                         }
 216                         argv[argc++] = start;
 217                         start = NULL;
 218                         if (ch == '\n' || ch == '\0') {
 219                                 if (expand && inquote) {
 220                                         free(argv);
 221                                         free(*buffer);
 222                                         *buffer = NULL;
 223                                         return NULL;
 224                                 }
 225                                 goto done;
 226                         }
 227                         continue;
 228                 case '\\':
 229                         if (!expand) {
 230                                 if (!start)
 231                                         start = t;
 232                                 *t++ = '\\';
 233                                 if (*(p+1) == '\0') /* catch '\' at end of line */
 234                                         continue;
 235                                 ch = *++p;
 236                                 break;
 237                         }
 238
 239                         switch (ch = *++p) {
 240                         case '\0':
 241                         case '\n':
 242                                 /* hmmm; fix it up as best we can */
 243                                 ch = '\\';
 244                                 --p;
 245                                 break;
 246                         case 'b':
 247                                 ch = '\b';
 248                                 break;
 249                         case 'f':
 250                                 ch = '\f';
 251                                 break;
 252                         case 'n':
 253                                 ch = '\n';
 254                                 break;
 255                         case 'r':
 256                                 ch = '\r';
 257                                 break;
 258                         case 't':
 259                                 ch = '\t';
 260                                 break;
 261                         }
 262                         break;
 263                 }
 264                 if (!start)
 265                         start = t;
 266                 *t++ = (char) ch;
 267         }
 268 done:   argv[argc] = NULL;
 269         *store_argc = argc;
 270         return(argv);
 271 }
 272
 273 /*
 274  * Str_FindSubstring -- See if a string contains a particular substring.
 275  *
 276  * Input:
 277  *      string          String to search.
 278  *      substring       Substring to find in string.
 279  *
 280  * Results: If string contains substring, the return value is the location of
 281  * the first matching instance of substring in string.  If string doesn't
 282  * contain substring, the return value is NULL.  Matching is done on an exact
 283  * character-for-character basis with no wildcards or special characters.
 284  *
 285  * Side effects: None.
 286  */
 287 char *
 288 Str_FindSubstring(const char *string, const char *substring)
 289 {
 290         const char *a, *b;
 291
 292         /*
 293          * First scan quickly through the two strings looking for a single-
 294          * character match.  When it's found, then compare the rest of the
 295          * substring.
 296          */
 297
 298         for (b = substring; *string != 0; string += 1) {
 299                 if (*string != *b)
 300                         continue;
 301                 a = string;
 302                 for (;;) {
 303                         if (*b == 0)
 304                                 return UNCONST(string);
 305                         if (*a++ != *b++)
 306                                 break;
 307                 }
 308                 b = substring;
 309         }
 310         return NULL;
 311 }
 312
 313 /*
 314  * Str_Match --
 315  *
 316  * See if a particular string matches a particular pattern.
 317  *
 318  * Results: Non-zero is returned if string matches pattern, 0 otherwise. The
 319  * matching operation permits the following special characters in the
 320  * pattern: *?\[] (see the man page for details on what these mean).
 321  *
 322  * XXX this function does not detect or report malformed patterns.
 323  *
 324  * Side effects: None.
 325  */
 326 int
 327 Str_Match(const char *string, const char *pattern)
 328 {
 329         char c2;
 330
 331         for (;;) {
 332                 /*
 333                  * See if we're at the end of both the pattern and the
 334                  * string. If, we succeeded.  If we're at the end of the
 335                  * pattern but not at the end of the string, we failed.
 336                  */
 337                 if (*pattern == 0)
 338                         return(!*string);
 339                 if (*string == 0 && *pattern != '*')
 340                         return(0);
 341                 /*
 342                  * Check for a "*" as the next pattern character.  It matches
 343                  * any substring.  We handle this by calling ourselves
 344                  * recursively for each postfix of string, until either we
 345                  * match or we reach the end of the string.
 346                  */
 347                 if (*pattern == '*') {
 348                         pattern += 1;
 349                         if (*pattern == 0)
 350                                 return(1);
 351                         while (*string != 0) {
 352                                 if (Str_Match(string, pattern))
 353                                         return(1);
 354                                 ++string;
 355                         }
 356                         return(0);
 357                 }
 358                 /*
 359                  * Check for a "?" as the next pattern character.  It matches
 360                  * any single character.
 361                  */
 362                 if (*pattern == '?')
 363                         goto thisCharOK;
 364                 /*
 365                  * Check for a "[" as the next pattern character.  It is
 366                  * followed by a list of characters that are acceptable, or
 367                  * by a range (two characters separated by "-").
 368                  */
 369                 if (*pattern == '[') {
 370                         ++pattern;
 371                         for (;;) {
 372                                 if ((*pattern == ']') || (*pattern == 0))
 373                                         return(0);
 374                                 if (*pattern == *string)
 375                                         break;
 376                                 if (pattern[1] == '-') {
 377                                         c2 = pattern[2];
 378                                         if (c2 == 0)
 379                                                 return(0);
 380                                         if ((*pattern <= *string) &&
 381                                             (c2 >= *string))
 382                                                 break;
 383                                         if ((*pattern >= *string) &&
 384                                             (c2 <= *string))
 385                                                 break;
 386                                         pattern += 2;
 387                                 }
 388                                 ++pattern;
 389                         }
 390                         while ((*pattern != ']') && (*pattern != 0))
 391                                 ++pattern;
 392                         goto thisCharOK;
 393                 }
 394                 /*
 395                  * If the next pattern character is '/', just strip off the
 396                  * '/' so we do exact matching on the character that follows.
 397                  */
 398                 if (*pattern == '\\') {
 399                         ++pattern;
 400                         if (*pattern == 0)
 401                                 return(0);
 402                 }
 403                 /*
 404                  * There's no special character.  Just make sure that the
 405                  * next characters of each string match.
 406                  */
 407                 if (*pattern != *string)
 408                         return(0);
 409 thisCharOK:     ++pattern;
 410                 ++string;
 411         }
 412 }
 413
 414
 415 /*-
 416  *-----------------------------------------------------------------------
 417  * Str_SYSVMatch --
 418  *      Check word against pattern for a match (% is wild),
 419  *
 420  * Input:
 421  *      word            Word to examine
 422  *      pattern         Pattern to examine against
 423  *      len             Number of characters to substitute
 424  *
 425  * Results:
 426  *      Returns the beginning position of a match or null. The number
 427  *      of characters matched is returned in len.
 428  *
 429  * Side Effects:
 430  *      None
 431  *
 432  *-----------------------------------------------------------------------
 433  */
 434 char *
 435 Str_SYSVMatch(const char *word, const char *pattern, int *len)
 436 {
 437     const char *p = pattern;
 438     const char *w = word;
 439     const char *m;
 440
 441     if (*p == '\0') {
 442         /* Null pattern is the whole string */
 443         *len = strlen(w);
 444         return UNCONST(w);
 445     }
 446
 447     if ((m = strchr(p, '%')) != NULL) {
 448         /* check that the prefix matches */
 449         for (; p != m && *w && *w == *p; w++, p++)
 450              continue;
 451
 452         if (p != m)
 453             return NULL;        /* No match */
 454
 455         if (*++p == '\0') {
 456             /* No more pattern, return the rest of the string */
 457             *len = strlen(w);
 458             return UNCONST(w);
 459         }
 460     }
 461
 462     m = w;
 463
 464     /* Find a matching tail */
 465     do
 466         if (strcmp(p, w) == 0) {
 467             *len = w - m;
 468             return UNCONST(m);
 469         }
 470     while (*w++ != '\0');
 471
 472     return NULL;
 473 }
 474
 475
 476 /*-
 477  *-----------------------------------------------------------------------
 478  * Str_SYSVSubst --
 479  *      Substitute '%' on the pattern with len characters from src.
 480  *      If the pattern does not contain a '%' prepend len characters
 481  *      from src.
 482  *
 483  * Results:
 484  *      None
 485  *
 486  * Side Effects:
 487  *      Places result on buf
 488  *
 489  *-----------------------------------------------------------------------
 490  */
 491 void
 492 Str_SYSVSubst(Buffer *buf, char *pat, char *src, int len)
 493 {
 494     char *m;
 495
 496     if ((m = strchr(pat, '%')) != NULL) {
 497         /* Copy the prefix */
 498         Buf_AddBytes(buf, m - pat, pat);
 499         /* skip the % */
 500         pat = m + 1;
 501     }
 502
 503     /* Copy the pattern */
 504     Buf_AddBytes(buf, len, src);
 505
 506     /* append the rest */
 507     Buf_AddBytes(buf, strlen(pat), pat);
 508 }