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fnmatch.c

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

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

This library 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with this library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#ifdef HAVE_CONFIG_H
#include "config.h"
#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__.  */

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