path: root/lib/fnmatch.c

/* Copyright (C) 1991-1993, 1996-2007, 2009-2018 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, see <https://www.gnu.org/licenses/>.  */

#ifndef _LIBC
# include <config.h>
#endif

/* Enable GNU extensions in fnmatch.h.  */
#ifndef _GNU_SOURCE
# define _GNU_SOURCE    1
#endif

#include <fnmatch.h>

#include <alloca.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <stddef.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>

#define WIDE_CHAR_SUPPORT \
  (HAVE_WCTYPE_H && HAVE_BTOWC && HAVE_ISWCTYPE \
   && HAVE_WMEMCHR && (HAVE_WMEMCPY || HAVE_WMEMPCPY))

/* For platform which support the ISO C amendment 1 functionality we
   support user defined character classes.  */
#if defined _LIBC || WIDE_CHAR_SUPPORT
# include <wctype.h>
# include <wchar.h>
#endif

/* We need some of the locale data (the collation sequence information)
   but there is no interface to get this information in general.  Therefore
   we support a correct implementation only in glibc.  */
#ifdef _LIBC
# include "../locale/localeinfo.h"
# include "../locale/elem-hash.h"
# include "../locale/coll-lookup.h"
# include <shlib-compat.h>

# define CONCAT(a,b) __CONCAT(a,b)
# define mbsrtowcs __mbsrtowcs
# define fnmatch __fnmatch
extern int fnmatch (const char *pattern, const char *string, int flags);
#endif

#ifndef SIZE_MAX
# define SIZE_MAX ((size_t) -1)
#endif

#include "flexmember.h"

#ifndef FALLTHROUGH
# if __GNUC__ < 7
#  define FALLTHROUGH ((void) 0)
# else
#  define FALLTHROUGH __attribute__ ((__fallthrough__))
# endif
#endif

/* We often have to test for FNM_FILE_NAME and FNM_PERIOD being both set.  */
#define NO_LEADING_PERIOD(flags) \
  ((flags & (FNM_FILE_NAME | FNM_PERIOD)) == (FNM_FILE_NAME | FNM_PERIOD))

/* Comment out all this code if we are using the GNU C Library, and are not
   actually compiling the library itself, and have not detected a bug
   in the library.  This code is part of the GNU C
   Library, but also included in many other GNU distributions.  Compiling
   and linking in this code is a waste when using the GNU C library
   (especially if it is a shared library).  Rather than having every GNU
   program understand 'configure --with-gnu-libc' and omit the object files,
   it is simpler to just do this in the source for each such file.  */

#if defined _LIBC || !defined __GNU_LIBRARY__ || !HAVE_FNMATCH_GNU


# if ! (defined isblank || (HAVE_ISBLANK && HAVE_DECL_ISBLANK))
#  define isblank(c) ((c) == ' ' || (c) == '\t')
# endif

# define STREQ(s1, s2) (strcmp (s1, s2) == 0)

# if defined _LIBC || WIDE_CHAR_SUPPORT
/* The GNU C library provides support for user-defined character classes
   and the functions from ISO C amendment 1.  */
#  ifdef CHARCLASS_NAME_MAX
#   define CHAR_CLASS_MAX_LENGTH CHARCLASS_NAME_MAX
#  else
/* This shouldn't happen but some implementation might still have this
   problem.  Use a reasonable default value.  */
#   define CHAR_CLASS_MAX_LENGTH 256
#  endif

#  ifdef _LIBC
#   define IS_CHAR_CLASS(string) __wctype (string)
#  else
#   define IS_CHAR_CLASS(string) wctype (string)
#  endif

#  ifdef _LIBC
#   define ISWCTYPE(WC, WT)     __iswctype (WC, WT)
#  else
#   define ISWCTYPE(WC, WT)     iswctype (WC, WT)
#  endif

#  if (HAVE_MBSTATE_T && HAVE_MBSRTOWCS) || _LIBC
/* In this case we are implementing the multibyte character handling.  */
#   define HANDLE_MULTIBYTE     1
#  endif

# else
#  define CHAR_CLASS_MAX_LENGTH  6 /* Namely, 'xdigit'.  */

#  define IS_CHAR_CLASS(string)                                               \
   (STREQ (string, "alpha") || STREQ (string, "upper")                        \
    || STREQ (string, "lower") || STREQ (string, "digit")                     \
    || STREQ (string, "alnum") || STREQ (string, "xdigit")                    \
    || STREQ (string, "space") || STREQ (string, "print")                     \
    || STREQ (string, "punct") || STREQ (string, "graph")                     \
    || STREQ (string, "cntrl") || STREQ (string, "blank"))
# endif

/* Avoid depending on library functions or files
   whose names are inconsistent.  */

/* Global variable.  */
static int posixly_correct;

# ifndef internal_function
/* Inside GNU libc we mark some function in a special way.  In other
   environments simply ignore the marking.  */
#  define internal_function
# endif

/* Note that this evaluates C many times.  */
# define FOLD(c) ((flags & FNM_CASEFOLD) ? tolower (c) : (c))
# define CHAR   char
# define UCHAR  unsigned char
# define INT    int
# define FCT    internal_fnmatch
# define EXT    ext_match
# define END    end_pattern
# define L_(CS) CS
# ifdef _LIBC
#  define BTOWC(C)      __btowc (C)
# else
#  define BTOWC(C)      btowc (C)
# endif
# define STRLEN(S) strlen (S)
# define STRCAT(D, S) strcat (D, S)
# ifdef _LIBC
#  define MEMPCPY(D, S, N) __mempcpy (D, S, N)
# else
#  if HAVE_MEMPCPY
#   define MEMPCPY(D, S, N) mempcpy (D, S, N)
#  else
#   define MEMPCPY(D, S, N) ((void *) ((char *) memcpy (D, S, N) + (N)))
#  endif
# endif
# define MEMCHR(S, C, N) memchr (S, C, N)
# include "fnmatch_loop.c"


# if HANDLE_MULTIBYTE
#  define FOLD(c) ((flags & FNM_CASEFOLD) ? towlower (c) : (c))
#  define CHAR  wchar_t
#  define UCHAR wint_t
#  define INT   wint_t
#  define FCT   internal_fnwmatch
#  define EXT   ext_wmatch
#  define END   end_wpattern
#  define L_(CS)        L##CS
#  define BTOWC(C)      (C)
#  ifdef _LIBC
#   define STRLEN(S) __wcslen (S)
#   define STRCAT(D, S) __wcscat (D, S)
#   define MEMPCPY(D, S, N) __wmempcpy (D, S, N)
#  else
#   define STRLEN(S) wcslen (S)
#   define STRCAT(D, S) wcscat (D, S)
#   if HAVE_WMEMPCPY
#    define MEMPCPY(D, S, N) wmempcpy (D, S, N)
#   else
#    define MEMPCPY(D, S, N) (wmemcpy (D, S, N) + (N))
#   endif
#  endif
#  define MEMCHR(S, C, N) wmemchr (S, C, N)
#  define WIDE_CHAR_VERSION 1

#  undef IS_CHAR_CLASS
/* We have to convert the wide character string in a multibyte string.  But
   we know that the character class names consist of alphanumeric characters
   from the portable character set, and since the wide character encoding
   for a member of the portable character set is the same code point as
   its single-byte encoding, we can use a simplified method to convert the
   string to a multibyte character string.  */
static wctype_t
is_char_class (const wchar_t *wcs)
{
  char s[CHAR_CLASS_MAX_LENGTH + 1];
  char *cp = s;

  do
    {
      /* Test for a printable character from the portable character set.  */
#  ifdef _LIBC
      if (*wcs < 0x20 || *wcs > 0x7e
          || *wcs == 0x24 || *wcs == 0x40 || *wcs == 0x60)
        return (wctype_t) 0;
#  else
      switch (*wcs)
        {
        case L' ': case L'!': case L'"': case L'#': case L'%':
        case L'&': case L'\'': case L'(': case L')': case L'*':
        case L'+': case L',': case L'-': case L'.': case L'/':
        case L'0': case L'1': case L'2': case L'3': case L'4':
        case L'5': case L'6': case L'7': case L'8': case L'9':
        case L':': case L';': case L'<': case L'=': case L'>':
        case L'?':
        case L'A': case L'B': case L'C': case L'D': case L'E':
        case L'F': case L'G': case L'H': case L'I': case L'J':
        case L'K': case L'L': case L'M': case L'N': case L'O':
        case L'P': case L'Q': case L'R': case L'S': case L'T':
        case L'U': case L'V': case L'W': case L'X': case L'Y':
        case L'Z':
        case L'[': case L'\\': case L']': case L'^': case L'_':
        case L'a': case L'b': case L'c': case L'd': case L'e':
        case L'f': case L'g': case L'h': case L'i': case L'j':
        case L'k': case L'l': case L'm': case L'n': case L'o':
        case L'p': case L'q': case L'r': case L's': case L't':
        case L'u': case L'v': case L'w': case L'x': case L'y':
        case L'z': case L'{': case L'|': case L'}': case L'~':
          break;
        default:
          return (wctype_t) 0;
        }
#  endif

      /* Avoid overrunning the buffer.  */
      if (cp == s + CHAR_CLASS_MAX_LENGTH)
        return (wctype_t) 0;

      *cp++ = (char) *wcs++;
    }
  while (*wcs != L'\0');

  *cp = '\0';

#  ifdef _LIBC
  return __wctype (s);
#  else
  return wctype (s);
#  endif
}
#  define IS_CHAR_CLASS(string) is_char_class (string)

#  include "fnmatch_loop.c"
# endif


int
fnmatch (const char *pattern, const char *string, int flags)
{
# if HANDLE_MULTIBYTE
#  define ALLOCA_LIMIT 2000
  if (__builtin_expect (MB_CUR_MAX, 1) != 1)
    {
      mbstate_t ps;
      size_t patsize;
      size_t strsize;
      size_t totsize;
      wchar_t *wpattern;
      wchar_t *wstring;
      int res;

      /* Calculate the size needed to convert the strings to
         wide characters.  */
      memset (&ps, '\0', sizeof (ps));
      patsize = mbsrtowcs (NULL, &pattern, 0, &ps) + 1;
      if (__builtin_expect (patsize != 0, 1))
        {
          assert (mbsinit (&ps));
          strsize = mbsrtowcs (NULL, &string, 0, &ps) + 1;
          if (__builtin_expect (strsize != 0, 1))
            {
              assert (mbsinit (&ps));
              totsize = patsize + strsize;
              if (__builtin_expect (! (patsize <= totsize
                                       && totsize <= SIZE_MAX / sizeof (wchar_t)),
                                    0))
                {
                  errno = ENOMEM;
                  return -1;
                }

              /* Allocate room for the wide characters.  */
              if (__builtin_expect (totsize < ALLOCA_LIMIT, 1))
                wpattern = (wchar_t *) alloca (totsize * sizeof (wchar_t));
              else
                {
                  wpattern = malloc (totsize * sizeof (wchar_t));
                  if (__builtin_expect (! wpattern, 0))
                    {
                      errno = ENOMEM;
                      return -1;
                    }
                }
              wstring = wpattern + patsize;

              /* Convert the strings into wide characters.  */
              mbsrtowcs (wpattern, &pattern, patsize, &ps);
              assert (mbsinit (&ps));
              mbsrtowcs (wstring, &string, strsize, &ps);

              res = internal_fnwmatch (wpattern, wstring, wstring + strsize - 1,
                                       flags & FNM_PERIOD, flags);

              if (__builtin_expect (! (totsize < ALLOCA_LIMIT), 0))
                free (wpattern);
              return res;
            }
        }
    }

# endif /* HANDLE_MULTIBYTE */

  return internal_fnmatch (pattern, string, string + strlen (string),
                           flags & FNM_PERIOD, flags);
}

# ifdef _LIBC
#  undef fnmatch
versioned_symbol (libc, __fnmatch, fnmatch, GLIBC_2_2_3);
#  if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2_3)
strong_alias (__fnmatch, __fnmatch_old)
compat_symbol (libc, __fnmatch_old, fnmatch, GLIBC_2_0);
#  endif
libc_hidden_ver (__fnmatch, fnmatch)
# endif

#endif  /* _LIBC or not __GNU_LIBRARY__.  */