fnmatch.c

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/* @(#)fnmatch.c    8.24 17/08/30 2005-2017 J. Schilling from 8.2 (Berkeley) */
#include <schily/mconfig.h>
#ifndef lint
static  UConst char sccsid[] =
    "@(#)fnmatch.c  8.24 17/08/30 2005-2017 J. Schilling from 8.2 (Berkeley)";
#endif
/*
 * Copyright (c) 1989, 1993, 1994
 *  The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Guido van Rossum.
 *
 * Copyright (c) 2005-2017 J. Schilling
 * Copyright (c) 2011 The FreeBSD Foundation
 * All rights reserved.
 * Portions of this software were developed by David Chisnall
 * under sponsorship from the FreeBSD Foundation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
 
#if defined(LIBC_SCCS) && !defined(lint)
static UConst char sccsid[] = "@(#)fnmatch.c    8.24 (Berkeley) 08/30/17";
#endif /* LIBC_SCCS and not lint */
/* "FBSD src/lib/libc/gen/fnmatch.c,v 1.19 2010/04/16 22:29:24 jilles Exp $" */
 
/*
 * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
 * Compares a filename or pathname to a pattern.
 */
 
/*
 * Some notes on multibyte character support:
 * 1. Patterns with illegal byte sequences match nothing.
 * 2. Illegal byte sequences in the "string" argument are handled by treating
 *    them as single-byte characters with a value of the first byte of the
 *    sequence cast to wchar_t.
 * 3. Multibyte conversion state objects (mbstate_t) are passed around and
 *    used for most, but not all, conversions. Further work will be required
 *    to support state-dependent encodings.
 */
 
#include <schily/mconfig.h>
#include <schily/fnmatch.h>
#include <schily/limits.h>
#include <schily/string.h>
#include <schily/wchar.h>
#include <schily/wctype.h>
#include <schily/libport.h> /* Define missing prototypes */
 
#define EOS '\0'
 
#define RANGE_MATCH 1
#define RANGE_NOMATCH   0
#define RANGE_ERROR (-1)
 
#define CL_SIZE     32  /* Max size for '[: :]'         */
 
static int rangematch __PR((const char *, wchar_t, int, char **, mbstate_t *));
static int fnmatch1 __PR((const char *, const char *, const char *, int,
                mbstate_t, mbstate_t));
 
#ifndef HAVE_FNMATCH
#undef  fnmatch
 
/*
 * The Cygwin compile environment incorrectly implements #pragma weak.
 * The weak symbols are only defined as local symbols making it impossible
 * to use them from outside the scope of this source file.
 * A platform that allows linking with global symbols has HAVE_LINK_WEAK
 * defined.
 */
#if defined(HAVE_PRAGMA_WEAK) && defined(HAVE_LINK_WEAK)
#pragma weak fnmatch =  js_fnmatch
#else
int
fnmatch(pattern, string, flags)
    const char  *pattern;
    const char  *string;
    int     flags;
{
    return (js_fnmatch(pattern, string, flags));
}
#endif
#endif
 
int
js_fnmatch(pattern, string, flags)
    const char  *pattern;
    const char  *string;
    int     flags;
{
    /*
     * SunPro C gives a warning if we do not initialize an object:
     * static const mbstate_t initial;
     * GCC gives a warning if we try to initialize it.
     * As the POSIX standard forbids mbstate_t from being an array,
     * we do not need "const", the var is always copied when used as
     * a parapemeter for fnmatch1();
     */
    static mbstate_t initial;
 
    return (fnmatch1(pattern, string, string, flags, initial, initial));
}
 
static int
fnmatch1(pattern, string, stringstart, flags, patmbs, strmbs)
    const char  *pattern;
    const char  *string;
    const char  *stringstart;
    int     flags;
    mbstate_t   patmbs;
    mbstate_t   strmbs;
{
    const char *bt_pattern, *bt_string;
    mbstate_t bt_patmbs, bt_strmbs;
    char *newp;
    char c;
    wchar_t pc, sc;
    size_t pclen, sclen;
 
    bt_pattern = bt_string = NULL;
    for (;;) {
        pclen = mbrtowc(&pc, pattern, MB_LEN_MAX, &patmbs);
        if (pclen == (size_t)-1 || pclen == (size_t)-2)
            return (FNM_NOMATCH);
        pattern += pclen;
        sclen = mbrtowc(&sc, string, MB_LEN_MAX, &strmbs);
        if (sclen == (size_t)-1 || sclen == (size_t)-2) {
            sc = (unsigned char)*string;
            sclen = 1;
            memset(&strmbs, 0, sizeof (strmbs));
        }
        switch (pc) {
        case EOS:
            if ((flags & FNM_LEADING_DIR) && sc == '/')
                return (0);
            if (sc == EOS)
                return (0);
            goto backtrack;
        case '?':
            if (sc == EOS)
                return (FNM_NOMATCH);
            if (sc == '/' && (flags & FNM_PATHNAME))
                goto backtrack;
            if (sc == '.' && (flags & FNM_PERIOD) &&
                (string == stringstart ||
                ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
                goto backtrack;
            string += sclen;
            break;
        case '*':
            c = *pattern;
            /* Collapse multiple stars. */
            while (c == '*')
                c = *++pattern;
 
            if (sc == '.' && (flags & FNM_PERIOD) &&
                (string == stringstart ||
                ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
                goto backtrack;
 
            /* Optimize for pattern with * at end or before /. */
            if (c == EOS) {
                if (flags & FNM_PATHNAME)
                    return ((flags & FNM_LEADING_DIR) ||
                        strchr(string, '/') == NULL ?
                        0 : FNM_NOMATCH);
                else
                    return (0);
            } else if (c == '/' && flags & FNM_PATHNAME) {
                if ((string = strchr(string, '/')) == NULL)
                    return (FNM_NOMATCH);
                break;
            }
 
            /*
             * First try the shortest match for the '*' that
             * could work. We can forget any earlier '*' since
             * there is no way having it match more characters
             * can help us, given that we are already here.
             */
            bt_pattern = pattern, bt_patmbs = patmbs;
            bt_string = string, bt_strmbs = strmbs;
            break;
        case '[':
            if (sc == EOS)
                return (FNM_NOMATCH);
            if (sc == '/' && (flags & FNM_PATHNAME))
                goto backtrack;
            if (sc == '.' && (flags & FNM_PERIOD) &&
                (string == stringstart ||
                ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
                goto backtrack;
 
            switch (rangematch(pattern, sc, flags, &newp,
                &patmbs)) {
            case RANGE_ERROR:
                goto norm;
            case RANGE_MATCH:
                pattern = newp;
                break;
            case RANGE_NOMATCH:
                goto backtrack;
            }
            string += sclen;
            break;
        case '\\':
            if (!(flags & FNM_NOESCAPE)) {
                pclen = mbrtowc(&pc, pattern, MB_LEN_MAX,
                    &patmbs);
                if (pclen == (size_t)-1 || pclen == (size_t)-2)
                    return (FNM_NOMATCH);
                if (pclen == 0)
                    return (FNM_NOMATCH);
                pattern += pclen;
            }
            /* FALLTHROUGH */
        default:
        norm:
            string += sclen;
            if (pc == sc) {
                ;
            } else if ((flags & FNM_CASEFOLD) &&
                    (towlower(pc) == towlower(sc))) {
                ;
            } else {
        backtrack:
                /*
                 * If we have a mismatch (other than hitting
                 * the end of the string), go back to the last
                 * '*' seen and have it match one additional
                 * character.
                 */
                if (bt_pattern == NULL)
                    return (FNM_NOMATCH);
                sclen = mbrtowc(&sc, bt_string, MB_LEN_MAX,
                    &bt_strmbs);
                if (sclen == (size_t)-1 ||
                    sclen == (size_t)-2) {
                    sc = (unsigned char)*bt_string;
                    sclen = 1;
                    memset(&bt_strmbs, 0,
                        sizeof (bt_strmbs));
                }
                if (sc == EOS)
                    return (FNM_NOMATCH);
                if (sc == '/' && flags & FNM_PATHNAME)
                    return (FNM_NOMATCH);
                bt_string += sclen;
                pattern = bt_pattern, patmbs = bt_patmbs;
                string = bt_string, strmbs = bt_strmbs;
            }
            break;
        }
    }
    /* NOTREACHED */
}
 
#ifdef  PROTOTYPES
static int
rangematch(const char *pattern, wchar_t test, int flags, char **newp,
        mbstate_t *patmbs)
#else
static int
rangematch(pattern, test, flags, newp, patmbs)
    const char *pattern;
    wchar_t test;
    int flags;
    char **newp;
    mbstate_t *patmbs;
#endif
{
    int negate, ok;
    wchar_t c, c2;
    wchar_t otest = test;
    size_t pclen;
    const char *origpat;
#ifdef  XXX_COLLATE
    struct xlocale_collate *table = (struct xlocale_collate *)
                    __get_locale()->components[XLC_COLLATE];
#endif
 
    /*
     * A bracket expression starting with an unquoted circumflex
     * character produces unspecified results (IEEE 1003.2-1992,
     * 3.13.2).  This implementation treats it like '!', for
     * consistency with the regular expression syntax.
     * J.T. Conklin (conklin@ngai.kaleida.com)
     */
    if ((negate = (*pattern == '!' || *pattern == '^')))
        ++pattern;
 
    if (flags & FNM_CASEFOLD)
        test = towlower(test);
 
    /*
     * A right bracket shall lose its special meaning and represent
     * itself in a bracket expression if it occurs first in the list.
     * -- POSIX.2 2.8.3.2
     */
    ok = 0;
    origpat = pattern;
    for (;;) {
        int quoted = 0;
 
        if (*pattern == ']' && pattern > origpat) {
            pattern++;
            break;
        } else if (*pattern == '\0') {
            return (RANGE_ERROR);
        } else if (*pattern == '/' && (flags & FNM_PATHNAME)) {
            return (RANGE_NOMATCH);
        } else if (*pattern == '\\' && !(flags & FNM_NOESCAPE)) {
            pattern++;
            quoted++;
        }
        pclen = mbrtowc(&c, pattern, MB_LEN_MAX, patmbs);
        if (pclen == (size_t)-1 || pclen == (size_t)-2)
            return (RANGE_NOMATCH);
        pattern += pclen;
 
        if (!quoted && c == '[') {
            if (pattern[0] == ':') {
                char    class[CL_SIZE+1];
                char    *pc = class;
                const char  *p;
 
                p = pattern + 1;    /* Eat ':' */
                for (;;) {
                    if (*p == '\0')
                        return (RANGE_ERROR);
                    if (*p == ':' && p[1] == ']')
                        break;
                    if (pc >= &class[CL_SIZE])
                        return (RANGE_ERROR);
                    *pc++ = *p++;
                }
                if (pc == class)
                    return (RANGE_ERROR);
                *pc = '\0';
                pattern = p + 2;    /* Skip ":]" */
                if (iswctype(otest, wctype(class))) {
                    ok = 1;
                } else if (flags & FNM_CASEFOLD) {
                    /*
                     * Convert to the other case
                     */
                    if (strcmp(class, "upper") == 0)
                        if (iswctype(otest,
                            wctype("lower")))
                            ok = 1;
                    else if (strcmp(class, "lower") == 0)
                        if (iswctype(otest,
                            wctype("upper")))
                            ok = 1;
                }
                continue;
            }
        }
 
        if (flags & FNM_CASEFOLD)
            c = towlower(c);
 
        if (*pattern == '-' && *(pattern + 1) != EOS &&
            *(pattern + 1) != ']') {
            if (*++pattern == '\\' && !(flags & FNM_NOESCAPE))
                if (*pattern != EOS)
                    pattern++;
            pclen = mbrtowc(&c2, pattern, MB_LEN_MAX, patmbs);
            if (pclen == (size_t)-1 || pclen == (size_t)-2)
                return (RANGE_NOMATCH);
            pattern += pclen;
            if (c2 == EOS)
                return (RANGE_ERROR);
 
            if (flags & FNM_CASEFOLD)
                c2 = towlower(c2);
 
#ifdef  XXX_COLLATE
            if (table->__collate_load_error ?
                c <= test && test <= c2 :
                __wcollate_range_cmp(c, test) <= 0 &&
                __wcollate_range_cmp(test, c2) <= 0)
                ok = 1;
#else
            if (c <= test && test <= c2)
                ok = 1;
#endif
        } else if (c == test)
            ok = 1;
    }
 
    *newp = (char *)pattern;
    return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
}