posix/fnmatch.c

   1 /* Copyright (C) 1991-2020 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    <https://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/coll-lookup.h"
  57 # include <shlib-compat.h>
  58
  59 # define CONCAT(a,b) __CONCAT(a,b)
  60 # define mbsrtowcs __mbsrtowcs
  61 # define fnmatch __fnmatch
  62 extern int fnmatch (const char *pattern, const char *string, int flags);
  63 #endif
  64
  65 /* We often have to test for FNM_FILE_NAME and FNM_PERIOD being both set.  */
  66 #define NO_LEADING_PERIOD(flags) \
  67   ((flags & (FNM_FILE_NAME | FNM_PERIOD)) == (FNM_FILE_NAME | FNM_PERIOD))
  68
  69 /* Comment out all this code if we are using the GNU C Library, and are not
  70    actually compiling the library itself.  This code is part of the GNU C
  71    Library, but also included in many other GNU distributions.  Compiling
  72    and linking in this code is a waste when using the GNU C library
  73    (especially if it is a shared library).  Rather than having every GNU
  74    program understand `configure --with-gnu-libc' and omit the object files,
  75    it is simpler to just do this in the source for each such file.  */
  76
  77 #if defined _LIBC || !defined __GNU_LIBRARY__
  78
  79
  80 # if defined STDC_HEADERS || !defined isascii
  81 #  define ISASCII(c) 1
  82 # else
  83 #  define ISASCII(c) isascii(c)
  84 # endif
  85
  86 # ifdef isblank
  87 #  define ISBLANK(c) (ISASCII (c) && isblank (c))
  88 # else
  89 #  define ISBLANK(c) ((c) == ' ' || (c) == '\t')
  90 # endif
  91 # ifdef isgraph
  92 #  define ISGRAPH(c) (ISASCII (c) && isgraph (c))
  93 # else
  94 #  define ISGRAPH(c) (ISASCII (c) && isprint (c) && !isspace (c))
  95 # endif
  96
  97 # define ISPRINT(c) (ISASCII (c) && isprint (c))
  98 # define ISDIGIT(c) (ISASCII (c) && isdigit (c))
  99 # define ISALNUM(c) (ISASCII (c) && isalnum (c))
 100 # define ISALPHA(c) (ISASCII (c) && isalpha (c))
 101 # define ISCNTRL(c) (ISASCII (c) && iscntrl (c))
 102 # define ISLOWER(c) (ISASCII (c) && islower (c))
 103 # define ISPUNCT(c) (ISASCII (c) && ispunct (c))
 104 # define ISSPACE(c) (ISASCII (c) && isspace (c))
 105 # define ISUPPER(c) (ISASCII (c) && isupper (c))
 106 # define ISXDIGIT(c) (ISASCII (c) && isxdigit (c))
 107
 108 # define STREQ(s1, s2) ((strcmp (s1, s2) == 0))
 109
 110 # if defined _LIBC || (defined HAVE_WCTYPE_H && defined HAVE_WCHAR_H)
 111 /* The GNU C library provides support for user-defined character classes
 112    and the functions from ISO C amendement 1.  */
 113 #  ifdef CHARCLASS_NAME_MAX
 114 #   define CHAR_CLASS_MAX_LENGTH CHARCLASS_NAME_MAX
 115 #  else
 116 /* This shouldn't happen but some implementation might still have this
 117    problem.  Use a reasonable default value.  */
 118 #   define CHAR_CLASS_MAX_LENGTH 256
 119 #  endif
 120
 121 #  ifdef _LIBC
 122 #   define IS_CHAR_CLASS(string) __wctype (string)
 123 #  else
 124 #   define IS_CHAR_CLASS(string) wctype (string)
 125 #  endif
 126
 127 #  ifdef _LIBC
 128 #   define ISWCTYPE(WC, WT)     __iswctype (WC, WT)
 129 #  else
 130 #   define ISWCTYPE(WC, WT)     iswctype (WC, WT)
 131 #  endif
 132
 133 #  if (HAVE_MBSTATE_T && HAVE_MBSRTOWCS) || _LIBC
 134 /* In this case we are implementing the multibyte character handling.  */
 135 #   define HANDLE_MULTIBYTE     1
 136 #  endif
 137
 138 # else
 139 #  define CHAR_CLASS_MAX_LENGTH  6 /* Namely, `xdigit'.  */
 140
 141 #  define IS_CHAR_CLASS(string)                                               \
 142    (STREQ (string, "alpha") || STREQ (string, "upper")                        \
 143     || STREQ (string, "lower") || STREQ (string, "digit")                     \
 144     || STREQ (string, "alnum") || STREQ (string, "xdigit")                    \
 145     || STREQ (string, "space") || STREQ (string, "print")                     \
 146     || STREQ (string, "punct") || STREQ (string, "graph")                     \
 147     || STREQ (string, "cntrl") || STREQ (string, "blank"))
 148 # endif
 149
 150 /* Avoid depending on library functions or files
 151    whose names are inconsistent.  */
 152
 153 # if !defined _LIBC && !defined getenv
 154 extern char *getenv ();
 155 # endif
 156
 157 # ifndef errno
 158 extern int errno;
 159 # endif
 160
 161 /* Global variable.  */
 162 static int posixly_correct;
 163
 164 /* This function doesn't exist on most systems.  */
 165
 166 # if !defined HAVE___STRCHRNUL && !defined _LIBC
 167 static char *
 168 __strchrnul (const char *s, int c)
 169 {
 170   char *result = strchr (s, c);
 171   if (result == NULL)
 172     result = strchr (s, '\0');
 173   return result;
 174 }
 175 # endif
 176
 177 # if HANDLE_MULTIBYTE && !defined HAVE___STRCHRNUL && !defined _LIBC
 178 static wchar_t *
 179 __wcschrnul (const wchar_t *s, wint_t c)
 180 {
 181   wchar_t *result = wcschr (s, c);
 182   if (result == NULL)
 183     result = wcschr (s, '\0');
 184   return result;
 185 }
 186 # endif
 187
 188 /* Note that this evaluates C many times.  */
 189 # ifdef _LIBC
 190 #  define FOLD(c) ((flags & FNM_CASEFOLD) ? tolower (c) : (c))
 191 # else
 192 #  define FOLD(c) ((flags & FNM_CASEFOLD) && ISUPPER (c) ? tolower (c) : (c))
 193 # endif
 194 # define CHAR   char
 195 # define UCHAR  unsigned char
 196 # define INT    int
 197 # define FCT    internal_fnmatch
 198 # define EXT    ext_match
 199 # define END    end_pattern
 200 # define STRUCT fnmatch_struct
 201 # define L(CS)  CS
 202 # ifdef _LIBC
 203 #  define BTOWC(C)      __btowc (C)
 204 # else
 205 #  define BTOWC(C)      btowc (C)
 206 # endif
 207 # define STRLEN(S) strlen (S)
 208 # define STRCAT(D, S) strcat (D, S)
 209 # define MEMPCPY(D, S, N) __mempcpy (D, S, N)
 210 # define MEMCHR(S, C, N) memchr (S, C, N)
 211 # define STRCOLL(S1, S2) strcoll (S1, S2)
 212 # define WIDE_CHAR_VERSION 0
 213 # include <locale/weight.h>
 214 # define FINDIDX findidx
 215 # include "fnmatch_loop.c"
 216
 217
 218 # if HANDLE_MULTIBYTE
 219 /* Note that this evaluates C many times.  */
 220 #  ifdef _LIBC
 221 #   define FOLD(c) ((flags & FNM_CASEFOLD) ? __towlower (c) : (c))
 222 #  else
 223 #   define FOLD(c) ((flags & FNM_CASEFOLD) && ISUPPER (c) ? towlower (c) : (c))
 224 #  endif
 225 #  define CHAR  wchar_t
 226 #  define UCHAR wint_t
 227 #  define INT   wint_t
 228 #  define FCT   internal_fnwmatch
 229 #  define EXT   ext_wmatch
 230 #  define END   end_wpattern
 231 #  define STRUCT fnwmatch_struct
 232 #  define L(CS) L##CS
 233 #  define BTOWC(C)      (C)
 234 #  define STRLEN(S) __wcslen (S)
 235 #  define STRCAT(D, S) __wcscat (D, S)
 236 #  define MEMPCPY(D, S, N) __wmempcpy (D, S, N)
 237 #  define MEMCHR(S, C, N) __wmemchr (S, C, N)
 238 #  define STRCOLL(S1, S2) wcscoll (S1, S2)
 239 #  ifdef _LIBC
 240 #   define WMEMCMP(S1, S2, N) __wmemcmp (S1, S2, N)
 241 #  else
 242 #   define WMEMCMP(S1, S2, N) wmemcmp (S1, S2, N)
 243 #  endif
 244 #  define WIDE_CHAR_VERSION 1
 245 /* Change the name the header defines so it doesn't conflict with
 246    the <locale/weight.h> version included above.  */
 247 #  define findidx findidxwc
 248 #  include <locale/weightwc.h>
 249 #  undef findidx
 250 #  define FINDIDX findidxwc
 251
 252 #  undef IS_CHAR_CLASS
 253 /* We have to convert the wide character string in a multibyte string.  But
 254    we know that the character class names consist of alphanumeric characters
 255    from the portable character set, and since the wide character encoding
 256    for a member of the portable character set is the same code point as
 257    its single-byte encoding, we can use a simplified method to convert the
 258    string to a multibyte character string.  */
 259 static wctype_t
 260 is_char_class (const wchar_t *wcs)
 261 {
 262   char s[CHAR_CLASS_MAX_LENGTH + 1];
 263   char *cp = s;
 264
 265   do
 266     {
 267       /* Test for a printable character from the portable character set.  */
 268 #  ifdef _LIBC
 269       if (*wcs < 0x20 || *wcs > 0x7e
 270           || *wcs == 0x24 || *wcs == 0x40 || *wcs == 0x60)
 271         return (wctype_t) 0;
 272 #  else
 273       switch (*wcs)
 274         {
 275         case L' ': case L'!': case L'"': case L'#': case L'%':
 276         case L'&': case L'\'': case L'(': case L')': case L'*':
 277         case L'+': case L',': case L'-': case L'.': case L'/':
 278         case L'0': case L'1': case L'2': case L'3': case L'4':
 279         case L'5': case L'6': case L'7': case L'8': case L'9':
 280         case L':': case L';': case L'<': case L'=': case L'>':
 281         case L'?':
 282         case L'A': case L'B': case L'C': case L'D': case L'E':
 283         case L'F': case L'G': case L'H': case L'I': case L'J':
 284         case L'K': case L'L': case L'M': case L'N': case L'O':
 285         case L'P': case L'Q': case L'R': case L'S': case L'T':
 286         case L'U': case L'V': case L'W': case L'X': case L'Y':
 287         case L'Z':
 288         case L'[': case L'\\': case L']': case L'^': case L'_':
 289         case L'a': case L'b': case L'c': case L'd': case L'e':
 290         case L'f': case L'g': case L'h': case L'i': case L'j':
 291         case L'k': case L'l': case L'm': case L'n': case L'o':
 292         case L'p': case L'q': case L'r': case L's': case L't':
 293         case L'u': case L'v': case L'w': case L'x': case L'y':
 294         case L'z': case L'{': case L'|': case L'}': case L'~':
 295           break;
 296         default:
 297           return (wctype_t) 0;
 298         }
 299 #  endif
 300
 301       /* Avoid overrunning the buffer.  */
 302       if (cp == s + CHAR_CLASS_MAX_LENGTH)
 303         return (wctype_t) 0;
 304
 305       *cp++ = (char) *wcs++;
 306     }
 307   while (*wcs != L'\0');
 308
 309   *cp = '\0';
 310
 311 #  ifdef _LIBC
 312   return __wctype (s);
 313 #  else
 314   return wctype (s);
 315 #  endif
 316 }
 317 #  define IS_CHAR_CLASS(string) is_char_class (string)
 318
 319 #  include "fnmatch_loop.c"
 320 # endif
 321
 322
 323 int
 324 fnmatch (const char *pattern, const char *string, int flags)
 325 {
 326 # if HANDLE_MULTIBYTE
 327   if (__builtin_expect (MB_CUR_MAX, 1) != 1)
 328     {
 329       mbstate_t ps;
 330       size_t n;
 331       const char *p;
 332       wchar_t *wpattern_malloc = NULL;
 333       wchar_t *wpattern;
 334       wchar_t *wstring_malloc = NULL;
 335       wchar_t *wstring;
 336       size_t alloca_used = 0;
 337
 338       /* Convert the strings into wide characters.  */
 339       memset (&ps, '\0', sizeof (ps));
 340       p = pattern;
 341 #ifdef _LIBC
 342       n = __strnlen (pattern, 1024);
 343 #else
 344       n = strlen (pattern);
 345 #endif
 346       if (__glibc_likely (n < 1024))
 347         {
 348           wpattern = (wchar_t *) alloca_account ((n + 1) * sizeof (wchar_t),
 349                                                  alloca_used);
 350           n = mbsrtowcs (wpattern, &p, n + 1, &ps);
 351           if (__glibc_unlikely (n == (size_t) -1))
 352             /* Something wrong.
 353                XXX Do we have to set `errno' to something which mbsrtows hasn't
 354                already done?  */
 355             return -1;
 356           if (p)
 357             {
 358               memset (&ps, '\0', sizeof (ps));
 359               goto prepare_wpattern;
 360             }
 361         }
 362       else
 363         {
 364         prepare_wpattern:
 365           n = mbsrtowcs (NULL, &pattern, 0, &ps);
 366           if (__glibc_unlikely (n == (size_t) -1))
 367             /* Something wrong.
 368                XXX Do we have to set `errno' to something which mbsrtows hasn't
 369                already done?  */
 370             return -1;
 371           if (__glibc_unlikely (n >= (size_t) -1 / sizeof (wchar_t)))
 372             {
 373               __set_errno (ENOMEM);
 374               return -2;
 375             }
 376           wpattern_malloc = wpattern
 377             = (wchar_t *) malloc ((n + 1) * sizeof (wchar_t));
 378           assert (mbsinit (&ps));
 379           if (wpattern == NULL)
 380             return -2;
 381           (void) mbsrtowcs (wpattern, &pattern, n + 1, &ps);
 382         }
 383
 384       assert (mbsinit (&ps));
 385 #ifdef _LIBC
 386       n = __strnlen (string, 1024);
 387 #else
 388       n = strlen (string);
 389 #endif
 390       p = string;
 391       if (__glibc_likely (n < 1024))
 392         {
 393           wstring = (wchar_t *) alloca_account ((n + 1) * sizeof (wchar_t),
 394                                                 alloca_used);
 395           n = mbsrtowcs (wstring, &p, n + 1, &ps);
 396           if (__glibc_unlikely (n == (size_t) -1))
 397             {
 398               /* Something wrong.
 399                  XXX Do we have to set `errno' to something which
 400                  mbsrtows hasn't already done?  */
 401             free_return:
 402               free (wpattern_malloc);
 403               return -1;
 404             }
 405           if (p)
 406             {
 407               memset (&ps, '\0', sizeof (ps));
 408               goto prepare_wstring;
 409             }
 410         }
 411       else
 412         {
 413         prepare_wstring:
 414           n = mbsrtowcs (NULL, &string, 0, &ps);
 415           if (__glibc_unlikely (n == (size_t) -1))
 416             /* Something wrong.
 417                XXX Do we have to set `errno' to something which mbsrtows hasn't
 418                already done?  */
 419             goto free_return;
 420           if (__glibc_unlikely (n >= (size_t) -1 / sizeof (wchar_t)))
 421             {
 422               free (wpattern_malloc);
 423               __set_errno (ENOMEM);
 424               return -2;
 425             }
 426
 427           wstring_malloc = wstring
 428             = (wchar_t *) malloc ((n + 1) * sizeof (wchar_t));
 429           if (wstring == NULL)
 430             {
 431               free (wpattern_malloc);
 432               return -2;
 433             }
 434           assert (mbsinit (&ps));
 435           (void) mbsrtowcs (wstring, &string, n + 1, &ps);
 436         }
 437
 438       int res = internal_fnwmatch (wpattern, wstring, wstring + n,
 439                                    flags & FNM_PERIOD, flags, NULL,
 440                                    alloca_used);
 441
 442       free (wstring_malloc);
 443       free (wpattern_malloc);
 444
 445       return res;
 446     }
 447 # endif  /* mbstate_t and mbsrtowcs or _LIBC.  */
 448
 449   return internal_fnmatch (pattern, string, string + strlen (string),
 450                            flags & FNM_PERIOD, flags, NULL, 0);
 451 }
 452
 453 # ifdef _LIBC
 454 #  undef fnmatch
 455 versioned_symbol (libc, __fnmatch, fnmatch, GLIBC_2_2_3);
 456 #  if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2_3)
 457 strong_alias (__fnmatch, __fnmatch_old)
 458 compat_symbol (libc, __fnmatch_old, fnmatch, GLIBC_2_0);
 459 #  endif
 460 libc_hidden_ver (__fnmatch, fnmatch)
 461 # endif
 462
 463 #endif  /* _LIBC or not __GNU_LIBRARY__.  */