libiberty/fnmatch.c

/* Copyright (C) 1991-2026 Free Software Foundation, Inc.

NOTE: This source is derived from an old version taken from the GNU C
Library (glibc).

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, 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, 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


#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif

/* This code to undef const added in libiberty.  */
#ifndef __STDC__
/* This is a separate conditional since some stdc systems
   reject `defined (const)'.  */
#ifndef const
#define const
#endif
#endif

#include <errno.h>
#include <fnmatch.h>
#include <safe-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 (const char *pattern, const char *string, int flags)
{
  register const char *p = pattern, *n = string;
  register unsigned char c;

#define FOLD(c)	((flags & FNM_CASEFOLD) ? 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 ((unsigned char)*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;

	  {
	    unsigned char c1 = (!(flags & FNM_NOESCAPE) && c == '\\') ? *p : c;
	    c1 = FOLD (c1);
	    for (--p; *n != '\0'; ++n)
	      if ((c == '[' || FOLD ((unsigned char)*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 negate;

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

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

	    negate = (*p == '!' || *p == '^');
	    if (negate)
	      ++p;

	    c = *p++;
	    for (;;)
	      {
		register unsigned 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 ((unsigned char)*n) >= cstart
		    && FOLD ((unsigned char)*n) <= cend)
		  goto matched;

		if (c == ']')
		  break;
	      }
	    if (!negate)
	      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 (negate)
	      return FNM_NOMATCH;
	  }
	  break;

	default:
	  if (c != FOLD ((unsigned char)*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__.  */