posix/fnmatch.c

   1 /* Copyright (C) 1991-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #if HAVE_CONFIG_H
  19 # include <config.h>
  20 #endif
  21
  22 /* Enable GNU extensions in fnmatch.h.  */
  23 #ifndef _GNU_SOURCE
  24 # define _GNU_SOURCE    1
  25 #endif
  26
  27 #include <assert.h>
  28 #include <errno.h>
  29 #include <fnmatch.h>
  30 #include <ctype.h>
  31 #include <string.h>
  32
  33 #if defined STDC_HEADERS || defined _LIBC
  34 # include <stdlib.h>
  35 #endif
  36
  37 #ifdef _LIBC
  38 # include <alloca.h>
  39 #else
  40 # define alloca_account(size., var) alloca (size)
  41 #endif
  42
  43 /* For platform which support the ISO C amendement 1 functionality we
  44    support user defined character classes.  */
  45 #if defined _LIBC || (defined HAVE_WCTYPE_H && defined HAVE_WCHAR_H)
  46 /* Solaris 2.5 has a bug: <wchar.h> must be included before <wctype.h>.  */
  47 # include <wchar.h>
  48 # include <wctype.h>
  49 #endif
  50
  51 /* We need some of the locale data (the collation sequence information)
  52    but there is no interface to get this information in general.  Therefore
  53    we support a correct implementation only in glibc.  */
  54 #ifdef _LIBC
  55 # include "../locale/localeinfo.h"
  56 # include "../locale/elem-hash.h"
  57 # include "../locale/coll-lookup.h"
  58 # include <shlib-compat.h>
  59
  60 # define CONCAT(a,b) __CONCAT(a,b)
  61 # define mbsrtowcs __mbsrtowcs
  62 # define fnmatch __fnmatch
  63 extern int fnmatch (const char *pattern, const char *string, int flags);
  64 #endif
  65
  66 /* We often have to test for FNM_FILE_NAME and FNM_PERIOD being both set.  */
  67 #define NO_LEADING_PERIOD(flags) \
  68   ((flags & (FNM_FILE_NAME | FNM_PERIOD)) == (FNM_FILE_NAME | FNM_PERIOD))
  69
  70 /* Comment out all this code if we are using the GNU C Library, and are not
  71    actually compiling the library itself.  This code is part of the GNU C
  72    Library, but also included in many other GNU distributions.  Compiling
  73    and linking in this code is a waste when using the GNU C library
  74    (especially if it is a shared library).  Rather than having every GNU
  75    program understand `configure --with-gnu-libc' and omit the object files,
  76    it is simpler to just do this in the source for each such file.  */
  77
  78 #if defined _LIBC || !defined __GNU_LIBRARY__
  79
  80
  81 # if defined STDC_HEADERS || !defined isascii
  82 #  define ISASCII(c) 1
  83 # else
  84 #  define ISASCII(c) isascii(c)
  85 # endif
  86
  87 # ifdef isblank
  88 #  define ISBLANK(c) (ISASCII (c) && isblank (c))
  89 # else
  90 #  define ISBLANK(c) ((c) == ' ' || (c) == '\t')
  91 # endif
  92 # ifdef isgraph
  93 #  define ISGRAPH(c) (ISASCII (c) && isgraph (c))
  94 # else
  95 #  define ISGRAPH(c) (ISASCII (c) && isprint (c) && !isspace (c))
  96 # endif
  97
  98 # define ISPRINT(c) (ISASCII (c) && isprint (c))
  99 # define ISDIGIT(c) (ISASCII (c) && isdigit (c))
 100 # define ISALNUM(c) (ISASCII (c) && isalnum (c))
 101 # define ISALPHA(c) (ISASCII (c) && isalpha (c))
 102 # define ISCNTRL(c) (ISASCII (c) && iscntrl (c))
 103 # define ISLOWER(c) (ISASCII (c) && islower (c))
 104 # define ISPUNCT(c) (ISASCII (c) && ispunct (c))
 105 # define ISSPACE(c) (ISASCII (c) && isspace (c))
 106 # define ISUPPER(c) (ISASCII (c) && isupper (c))
 107 # define ISXDIGIT(c) (ISASCII (c) && isxdigit (c))
 108
 109 # define STREQ(s1, s2) ((strcmp (s1, s2) == 0))
 110
 111 # if defined _LIBC || (defined HAVE_WCTYPE_H && defined HAVE_WCHAR_H)
 112 /* The GNU C library provides support for user-defined character classes
 113    and the functions from ISO C amendement 1.  */
 114 #  ifdef CHARCLASS_NAME_MAX
 115 #   define CHAR_CLASS_MAX_LENGTH CHARCLASS_NAME_MAX
 116 #  else
 117 /* This shouldn't happen but some implementation might still have this
 118    problem.  Use a reasonable default value.  */
 119 #   define CHAR_CLASS_MAX_LENGTH 256
 120 #  endif
 121
 122 #  ifdef _LIBC
 123 #   define IS_CHAR_CLASS(string) __wctype (string)
 124 #  else
 125 #   define IS_CHAR_CLASS(string) wctype (string)
 126 #  endif
 127
 128 #  ifdef _LIBC
 129 #   define ISWCTYPE(WC, WT)     __iswctype (WC, WT)
 130 #  else
 131 #   define ISWCTYPE(WC, WT)     iswctype (WC, WT)
 132 #  endif
 133
 134 #  if (HAVE_MBSTATE_T && HAVE_MBSRTOWCS) || _LIBC
 135 /* In this case we are implementing the multibyte character handling.  */
 136 #   define HANDLE_MULTIBYTE     1
 137 #  endif
 138
 139 # else
 140 #  define CHAR_CLASS_MAX_LENGTH  6 /* Namely, `xdigit'.  */
 141
 142 #  define IS_CHAR_CLASS(string)                                               \
 143    (STREQ (string, "alpha") || STREQ (string, "upper")                        \
 144     || STREQ (string, "lower") || STREQ (string, "digit")                     \
 145     || STREQ (string, "alnum") || STREQ (string, "xdigit")                    \
 146     || STREQ (string, "space") || STREQ (string, "print")                     \
 147     || STREQ (string, "punct") || STREQ (string, "graph")                     \
 148     || STREQ (string, "cntrl") || STREQ (string, "blank"))
 149 # endif
 150
 151 /* Avoid depending on library functions or files
 152    whose names are inconsistent.  */
 153
 154 # if !defined _LIBC && !defined getenv
 155 extern char *getenv ();
 156 # endif
 157
 158 # ifndef errno
 159 extern int errno;
 160 # endif
 161
 162 /* Global variable.  */
 163 static int posixly_correct;
 164
 165 /* This function doesn't exist on most systems.  */
 166
 167 # if !defined HAVE___STRCHRNUL && !defined _LIBC
 168 static char *
 169 __strchrnul (const char *s, int c)
 170 {
 171   char *result = strchr (s, c);
 172   if (result == NULL)
 173     result = strchr (s, '\0');
 174   return result;
 175 }
 176 # endif
 177
 178 # if HANDLE_MULTIBYTE && !defined HAVE___STRCHRNUL && !defined _LIBC
 179 static wchar_t *
 180 __wcschrnul (const wchar_t *s, wint_t c)
 181 {
 182   wchar_t *result = wcschr (s, c);
 183   if (result == NULL)
 184     result = wcschr (s, '\0');
 185   return result;
 186 }
 187 # endif
 188
 189 # ifndef internal_function
 190 /* Inside GNU libc we mark some function in a special way.  In other
 191    environments simply ignore the marking.  */
 192 #  define internal_function
 193 # endif
 194
 195 /* Note that this evaluates C many times.  */
 196 # ifdef _LIBC
 197 #  define FOLD(c) ((flags & FNM_CASEFOLD) ? tolower (c) : (c))
 198 # else
 199 #  define FOLD(c) ((flags & FNM_CASEFOLD) && ISUPPER (c) ? tolower (c) : (c))
 200 # endif
 201 # define CHAR   char
 202 # define UCHAR  unsigned char
 203 # define INT    int
 204 # define FCT    internal_fnmatch
 205 # define EXT    ext_match
 206 # define END    end_pattern
 207 # define STRUCT fnmatch_struct
 208 # define L(CS)  CS
 209 # ifdef _LIBC
 210 #  define BTOWC(C)      __btowc (C)
 211 # else
 212 #  define BTOWC(C)      btowc (C)
 213 # endif
 214 # define STRLEN(S) strlen (S)
 215 # define STRCAT(D, S) strcat (D, S)
 216 # define MEMPCPY(D, S, N) __mempcpy (D, S, N)
 217 # define MEMCHR(S, C, N) memchr (S, C, N)
 218 # define STRCOLL(S1, S2) strcoll (S1, S2)
 219 # define WIDE_CHAR_VERSION 0
 220 # include <locale/weight.h>
 221 # define FINDIDX findidx
 222 # include "fnmatch_loop.c"
 223
 224
 225 # if HANDLE_MULTIBYTE
 226 /* Note that this evaluates C many times.  */
 227 #  ifdef _LIBC
 228 #   define FOLD(c) ((flags & FNM_CASEFOLD) ? __towlower (c) : (c))
 229 #  else
 230 #   define FOLD(c) ((flags & FNM_CASEFOLD) && ISUPPER (c) ? towlower (c) : (c))
 231 #  endif
 232 #  define CHAR  wchar_t
 233 #  define UCHAR wint_t
 234 #  define INT   wint_t
 235 #  define FCT   internal_fnwmatch
 236 #  define EXT   ext_wmatch
 237 #  define END   end_wpattern
 238 #  define STRUCT fnwmatch_struct
 239 #  define L(CS) L##CS
 240 #  define BTOWC(C)      (C)
 241 #  define STRLEN(S) __wcslen (S)
 242 #  define STRCAT(D, S) __wcscat (D, S)
 243 #  define MEMPCPY(D, S, N) __wmempcpy (D, S, N)
 244 #  define MEMCHR(S, C, N) __wmemchr (S, C, N)
 245 #  define STRCOLL(S1, S2) wcscoll (S1, S2)
 246 #  define WIDE_CHAR_VERSION 1
 247 /* Change the name the header defines so it doesn't conflict with
 248    the <locale/weight.h> version included above.  */
 249 #  define findidx findidxwc
 250 #  include <locale/weightwc.h>
 251 #  undef findidx
 252 #  define FINDIDX findidxwc
 253
 254 #  undef IS_CHAR_CLASS
 255 /* We have to convert the wide character string in a multibyte string.  But
 256    we know that the character class names consist of alphanumeric characters
 257    from the portable character set, and since the wide character encoding
 258    for a member of the portable character set is the same code point as
 259    its single-byte encoding, we can use a simplified method to convert the
 260    string to a multibyte character string.  */
 261 static wctype_t
 262 is_char_class (const wchar_t *wcs)
 263 {
 264   char s[CHAR_CLASS_MAX_LENGTH + 1];
 265   char *cp = s;
 266
 267   do
 268     {
 269       /* Test for a printable character from the portable character set.  */
 270 #  ifdef _LIBC
 271       if (*wcs < 0x20 || *wcs > 0x7e
 272           || *wcs == 0x24 || *wcs == 0x40 || *wcs == 0x60)
 273         return (wctype_t) 0;
 274 #  else
 275       switch (*wcs)
 276         {
 277         case L' ': case L'!': case L'"': case L'#': case L'%':
 278         case L'&': case L'\'': case L'(': case L')': case L'*':
 279         case L'+': case L',': case L'-': case L'.': case L'/':
 280         case L'0': case L'1': case L'2': case L'3': case L'4':
 281         case L'5': case L'6': case L'7': case L'8': case L'9':
 282         case L':': case L';': case L'<': case L'=': case L'>':
 283         case L'?':
 284         case L'A': case L'B': case L'C': case L'D': case L'E':
 285         case L'F': case L'G': case L'H': case L'I': case L'J':
 286         case L'K': case L'L': case L'M': case L'N': case L'O':
 287         case L'P': case L'Q': case L'R': case L'S': case L'T':
 288         case L'U': case L'V': case L'W': case L'X': case L'Y':
 289         case L'Z':
 290         case L'[': case L'\\': case L']': case L'^': case L'_':
 291         case L'a': case L'b': case L'c': case L'd': case L'e':
 292         case L'f': case L'g': case L'h': case L'i': case L'j':
 293         case L'k': case L'l': case L'm': case L'n': case L'o':
 294         case L'p': case L'q': case L'r': case L's': case L't':
 295         case L'u': case L'v': case L'w': case L'x': case L'y':
 296         case L'z': case L'{': case L'|': case L'}': case L'~':
 297           break;
 298         default:
 299           return (wctype_t) 0;
 300         }
 301 #  endif
 302
 303       /* Avoid overrunning the buffer.  */
 304       if (cp == s + CHAR_CLASS_MAX_LENGTH)
 305         return (wctype_t) 0;
 306
 307       *cp++ = (char) *wcs++;
 308     }
 309   while (*wcs != L'\0');
 310
 311   *cp = '\0';
 312
 313 #  ifdef _LIBC
 314   return __wctype (s);
 315 #  else
 316   return wctype (s);
 317 #  endif
 318 }
 319 #  define IS_CHAR_CLASS(string) is_char_class (string)
 320
 321 #  include "fnmatch_loop.c"
 322 # endif
 323
 324
 325 int
 326 fnmatch (const char *pattern, const char *string, int flags)
 327 {
 328 # if HANDLE_MULTIBYTE
 329   if (__builtin_expect (MB_CUR_MAX, 1) != 1)
 330     {
 331       mbstate_t ps;
 332       size_t n;
 333       const char *p;
 334       wchar_t *wpattern_malloc = NULL;
 335       wchar_t *wpattern;
 336       wchar_t *wstring_malloc = NULL;
 337       wchar_t *wstring;
 338       size_t alloca_used = 0;
 339
 340       /* Convert the strings into wide characters.  */
 341       memset (&ps, '\0', sizeof (ps));
 342       p = pattern;
 343 #ifdef _LIBC
 344       n = __strnlen (pattern, 1024);
 345 #else
 346       n = strlen (pattern);
 347 #endif
 348       if (__glibc_likely (n < 1024))
 349         {
 350           wpattern = (wchar_t *) alloca_account ((n + 1) * sizeof (wchar_t),
 351                                                  alloca_used);
 352           n = mbsrtowcs (wpattern, &p, n + 1, &ps);
 353           if (__glibc_unlikely (n == (size_t) -1))
 354             /* Something wrong.
 355                XXX Do we have to set `errno' to something which mbsrtows hasn't
 356                already done?  */
 357             return -1;
 358           if (p)
 359             {
 360               memset (&ps, '\0', sizeof (ps));
 361               goto prepare_wpattern;
 362             }
 363         }
 364       else
 365         {
 366         prepare_wpattern:
 367           n = mbsrtowcs (NULL, &pattern, 0, &ps);
 368           if (__glibc_unlikely (n == (size_t) -1))
 369             /* Something wrong.
 370                XXX Do we have to set `errno' to something which mbsrtows hasn't
 371                already done?  */
 372             return -1;
 373           if (__glibc_unlikely (n >= (size_t) -1 / sizeof (wchar_t)))
 374             {
 375               __set_errno (ENOMEM);
 376               return -2;
 377             }
 378           wpattern_malloc = wpattern
 379             = (wchar_t *) malloc ((n + 1) * sizeof (wchar_t));
 380           assert (mbsinit (&ps));
 381           if (wpattern == NULL)
 382             return -2;
 383           (void) mbsrtowcs (wpattern, &pattern, n + 1, &ps);
 384         }
 385
 386       assert (mbsinit (&ps));
 387 #ifdef _LIBC
 388       n = __strnlen (string, 1024);
 389 #else
 390       n = strlen (string);
 391 #endif
 392       p = string;
 393       if (__glibc_likely (n < 1024))
 394         {
 395           wstring = (wchar_t *) alloca_account ((n + 1) * sizeof (wchar_t),
 396                                                 alloca_used);
 397           n = mbsrtowcs (wstring, &p, n + 1, &ps);
 398           if (__glibc_unlikely (n == (size_t) -1))
 399             {
 400               /* Something wrong.
 401                  XXX Do we have to set `errno' to something which
 402                  mbsrtows hasn't already done?  */
 403             free_return:
 404               free (wpattern_malloc);
 405               return -1;
 406             }
 407           if (p)
 408             {
 409               memset (&ps, '\0', sizeof (ps));
 410               goto prepare_wstring;
 411             }
 412         }
 413       else
 414         {
 415         prepare_wstring:
 416           n = mbsrtowcs (NULL, &string, 0, &ps);
 417           if (__glibc_unlikely (n == (size_t) -1))
 418             /* Something wrong.
 419                XXX Do we have to set `errno' to something which mbsrtows hasn't
 420                already done?  */
 421             goto free_return;
 422           if (__glibc_unlikely (n >= (size_t) -1 / sizeof (wchar_t)))
 423             {
 424               free (wpattern_malloc);
 425               __set_errno (ENOMEM);
 426               return -2;
 427             }
 428
 429           wstring_malloc = wstring
 430             = (wchar_t *) malloc ((n + 1) * sizeof (wchar_t));
 431           if (wstring == NULL)
 432             {
 433               free (wpattern_malloc);
 434               return -2;
 435             }
 436           assert (mbsinit (&ps));
 437           (void) mbsrtowcs (wstring, &string, n + 1, &ps);
 438         }
 439
 440       int res = internal_fnwmatch (wpattern, wstring, wstring + n,
 441                                    flags & FNM_PERIOD, flags, NULL,
 442                                    alloca_used);
 443
 444       free (wstring_malloc);
 445       free (wpattern_malloc);
 446
 447       return res;
 448     }
 449 # endif  /* mbstate_t and mbsrtowcs or _LIBC.  */
 450
 451   return internal_fnmatch (pattern, string, string + strlen (string),
 452                            flags & FNM_PERIOD, flags, NULL, 0);
 453 }
 454
 455 # ifdef _LIBC
 456 #  undef fnmatch
 457 versioned_symbol (libc, __fnmatch, fnmatch, GLIBC_2_2_3);
 458 #  if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2_3)
 459 strong_alias (__fnmatch, __fnmatch_old)
 460 compat_symbol (libc, __fnmatch_old, fnmatch, GLIBC_2_0);
 461 #  endif
 462 libc_hidden_ver (__fnmatch, fnmatch)
 463 # endif
 464
 465 #endif  /* _LIBC or not __GNU_LIBRARY__.  */