source: trunk/third/diffutils/fnmatch.c @ 16149

/* Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.

NOTE: The canonical source of this file is maintained with the GNU C Library.
Bugs can be reported to bug-glibc@prep.ai.mit.edu.

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 2, 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, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#ifdef HAVE_CONFIG_H
#if defined (CONFIG_BROKETS)
/* We use <config.h> instead of "config.h" so that a compilation
   using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
   (which it would do because it found this file in $srcdir).  */
#include <config.h>
#else
#include "config.h"
#endif
#endif

#include <errno.h>
#include <fnmatch.h>
#include <ctype.h>


/* Comment out all this code if we are using the GNU C Library, and are not
   actually compiling the library itself.  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__)


#if !defined(__GNU_LIBRARY__) && !defined(STDC_HEADERS)
extern int errno;
#endif

/* Match STRING against the filename pattern PATTERN, returning zero if
   it matches, nonzero if not.  */
int
fnmatch (pattern, string, flags)
     const char *pattern;
     const char *string;
     int flags;
{
  register const char *p = pattern, *n = string;
  register char c;

/* Note that this evalutes C many times.  */
#define FOLD(c) ((flags & FNM_CASEFOLD) && isupper (c) ? tolower (c) : (c))

  while ((c = *p++) != '\0')
    {
      c = FOLD (c);

      switch (c)
        {
        case '?':
          if (*n == '\0')
            return FNM_NOMATCH;
          else if ((flags & FNM_FILE_NAME) && *n == '/')
            return FNM_NOMATCH;
          else if ((flags & FNM_PERIOD) && *n == '.' &&
                   (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
            return FNM_NOMATCH;
          break;

        case '\\':
          if (!(flags & FNM_NOESCAPE))
            {
              c = *p++;
              c = FOLD (c);
            }
          if (FOLD (*n) != c)
            return FNM_NOMATCH;
          break;

        case '*':
          if ((flags & FNM_PERIOD) && *n == '.' &&
              (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
            return FNM_NOMATCH;

          for (c = *p++; c == '?' || c == '*'; c = *p++, ++n)
            if (((flags & FNM_FILE_NAME) && *n == '/') ||
                (c == '?' && *n == '\0'))
              return FNM_NOMATCH;

          if (c == '\0')
            return 0;

          {
            char c1 = (!(flags & FNM_NOESCAPE) && c == '\\') ? *p : c;
            c1 = FOLD (c1);
            for (--p; *n != '\0'; ++n)
              if ((c == '[' || FOLD (*n) == c1) &&
                  fnmatch (p, n, flags & ~FNM_PERIOD) == 0)
                return 0;
            return FNM_NOMATCH;
          }

        case '[':
          {
            /* Nonzero if the sense of the character class is inverted.  */
            register int not;

            if (*n == '\0')
              return FNM_NOMATCH;

            if ((flags & FNM_PERIOD) && *n == '.' &&
                (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
              return FNM_NOMATCH;

            not = (*p == '!' || *p == '^');
            if (not)
              ++p;

            c = *p++;
            for (;;)
              {
                register char cstart = c, cend = c;

                if (!(flags & FNM_NOESCAPE) && c == '\\')
                  cstart = cend = *p++;

                cstart = cend = FOLD (cstart);

                if (c == '\0')
                  /* [ (unterminated) loses.  */
                  return FNM_NOMATCH;

                c = *p++;
                c = FOLD (c);

                if ((flags & FNM_FILE_NAME) && c == '/')
                  /* [/] can never match.  */
                  return FNM_NOMATCH;

                if (c == '-' && *p != ']')
                  {
                    cend = *p++;
                    if (!(flags & FNM_NOESCAPE) && cend == '\\')
                      cend = *p++;
                    if (cend == '\0')
                      return FNM_NOMATCH;
                    cend = FOLD (cend);

                    c = *p++;
                  }

                if (FOLD (*n) >= cstart && FOLD (*n) <= cend)
                  goto matched;

                if (c == ']')
                  break;
              }
            if (!not)
              return FNM_NOMATCH;
            break;

          matched:;
            /* Skip the rest of the [...] that already matched.  */
            while (c != ']')
              {
                if (c == '\0')
                  /* [... (unterminated) loses.  */
                  return FNM_NOMATCH;

                c = *p++;
                if (!(flags & FNM_NOESCAPE) && c == '\\')
                  /* XXX 1003.2d11 is unclear if this is right.  */
                  ++p;
              }
            if (not)
              return FNM_NOMATCH;
          }
          break;

        default:
          if (c != FOLD (*n))
            return FNM_NOMATCH;
        }

      ++n;
    }

  if (*n == '\0')
    return 0;

  if ((flags & FNM_LEADING_DIR) && *n == '/')
    /* The FNM_LEADING_DIR flag says that "foo*" matches "foobar/frobozz".  */
    return 0;

  return FNM_NOMATCH;
}

#endif  /* _LIBC or not __GNU_LIBRARY__.  */