source: trunk/libs/newlib/src/newlib/libc/posix/glob.c @ 577

/*
 * Copyright (c) 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Guido van Rossum.
 *
 * 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.
 * 4. 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.
 */

#ifdef __CYGWIN__
#define _NO_GLOB        /* Cygwin provides its own glob. */
#endif

#ifndef _NO_GLOB

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)glob.c      8.3 (Berkeley) 10/13/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>

/*
 * glob(3) -- a superset of the one defined in POSIX 1003.2.
 *
 * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
 *
 * Optional extra services, controlled by flags not defined by POSIX:
 *
 * GLOB_QUOTE:
 *      Escaping convention: \ inhibits any special meaning the following
 *      character might have (except \ at end of string is retained).
 * GLOB_MAGCHAR:
 *      Set in gl_flags if pattern contained a globbing character.
 * GLOB_NOMAGIC:
 *      Same as GLOB_NOCHECK, but it will only append pattern if it did
 *      not contain any magic characters.  [Used in csh style globbing]
 * GLOB_ALTDIRFUNC:
 *      Use alternately specified directory access functions.
 * GLOB_TILDE:
 *      expand ~user/foo to the /home/dir/of/user/foo
 * GLOB_BRACE:
 *      expand {1,2}{a,b} to 1a 1b 2a 2b
 * gl_matchc:
 *      Number of matches in the current invocation of glob.
 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <glob.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>

#include "collate.h"

#define DOLLAR          '$'
#define DOT             '.'
#define EOS             '\0'
#define LBRACKET        '['
#define NOT             '!'
#define QUESTION        '?'
#define QUOTE           '\\'
#define RANGE           '-'
#define RBRACKET        ']'
#define SEP             '/'
#define STAR            '*'
#define TILDE           '~'
#define UNDERSCORE      '_'
#define LBRACE          '{'
#define RBRACE          '}'
#define SLASH           '/'
#define COMMA           ','

#ifndef DEBUG

#define M_QUOTE         0x8000
#define M_PROTECT       0x4000
#define M_MASK          0xffff
#define M_ASCII         0x00ff

typedef u_short Char;

#else

#define M_QUOTE         0x80
#define M_PROTECT       0x40
#define M_MASK          0xff
#define M_ASCII         0x7f

typedef char Char;

#endif


#define CHAR(c)         ((Char)((c)&M_ASCII))
#define META(c)         ((Char)((c)|M_QUOTE))
#define M_ALL           META('*')
#define M_END           META(']')
#define M_NOT           META('!')
#define M_ONE           META('?')
#define M_RNG           META('-')
#define M_SET           META('[')
#define ismeta(c)       (((c)&M_QUOTE) != 0)


static int       compare(const void *, const void *);
static int       g_Ctoc(const Char *, char *, u_int);
static int       g_lstat(Char *, struct stat *, glob_t *);
static DIR      *g_opendir(Char *, glob_t *);
static Char     *g_strchr(Char *, int);
#ifdef notdef
static Char     *g_strcat(Char *, const Char *);
#endif
static int       g_stat(Char *, struct stat *, glob_t *);
static int       glob0(const Char *, glob_t *, int *);
static int       glob1(Char *, glob_t *, int *);
static int       glob2(Char *, Char *, Char *, Char *, glob_t *, int *);
static int       glob3(Char *, Char *, Char *, Char *, Char *, glob_t *, int *);
static int       globextend(const Char *, glob_t *, int *);
static const Char *     
                 globtilde(const Char *, Char *, size_t, glob_t *);
static int       globexp1(const Char *, glob_t *, int *);
static int       globexp2(const Char *, const Char *, glob_t *, int *, int *);
static int       match(Char *, Char *, Char *);
#ifdef DEBUG
static void      qprintf(const char *, Char *);
#endif

int
glob(pattern, flags, errfunc, pglob)
        const char *__restrict pattern;
        int flags, (*errfunc)(const char *, int);
        glob_t *__restrict pglob;
{
        const u_char *patnext;
        int c, limit;
        Char *bufnext, *bufend, patbuf[MAXPATHLEN];

        patnext = (u_char *) pattern;
        if (!(flags & GLOB_APPEND)) {
                pglob->gl_pathc = 0;
                pglob->gl_pathv = NULL;
                if (!(flags & GLOB_DOOFFS))
                        pglob->gl_offs = 0;
        }
        if (flags & GLOB_LIMIT) {
                limit = pglob->gl_matchc;
                if (limit == 0)
                        limit = ARG_MAX;
        } else
                limit = 0;
        pglob->gl_flags = flags & ~GLOB_MAGCHAR;
        pglob->gl_errfunc = errfunc;
        pglob->gl_matchc = 0;

        bufnext = patbuf;
        bufend = bufnext + MAXPATHLEN - 1;
        if (flags & GLOB_QUOTE) {
                /* Protect the quoted characters. */
                while (bufnext < bufend && (c = *patnext++) != EOS)
                        if (c == QUOTE) {
                                if ((c = *patnext++) == EOS) {
                                        c = QUOTE;
                                        --patnext;
                                }
                                *bufnext++ = c | M_PROTECT;
                        }
                        else
                                *bufnext++ = c;
        }
        else
            while (bufnext < bufend && (c = *patnext++) != EOS)
                    *bufnext++ = c;
        *bufnext = EOS;

        if (flags & GLOB_BRACE)
            return globexp1(patbuf, pglob, &limit);
        else
            return glob0(patbuf, pglob, &limit);
}

/*
 * Expand recursively a glob {} pattern. When there is no more expansion
 * invoke the standard globbing routine to glob the rest of the magic
 * characters
 */
static int
globexp1(pattern, pglob, limit)
        const Char *pattern;
        glob_t *pglob;
        int *limit;
{
        const Char* ptr = pattern;
        int rv;

        /* Protect a single {}, for find(1), like csh */
        if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
                return glob0(pattern, pglob, limit);

        while ((ptr = (const Char *) g_strchr((Char *) ptr, LBRACE)) != NULL)
                if (!globexp2(ptr, pattern, pglob, &rv, limit))
                        return rv;

        return glob0(pattern, pglob, limit);
}


/*
 * Recursive brace globbing helper. Tries to expand a single brace.
 * If it succeeds then it invokes globexp1 with the new pattern.
 * If it fails then it tries to glob the rest of the pattern and returns.
 */
static int
globexp2(ptr, pattern, pglob, rv, limit)
        const Char *ptr, *pattern;
        glob_t *pglob;
        int *rv, *limit;
{
        int     i;
        Char   *lm, *ls;
        const Char *pe, *pm, *pl;
        Char    patbuf[MAXPATHLEN];

        /* copy part up to the brace */
        for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
                continue;
        *lm = EOS;
        ls = lm;

        /* Find the balanced brace */
        for (i = 0, pe = ++ptr; *pe; pe++)
                if (*pe == LBRACKET) {
                        /* Ignore everything between [] */
                        for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
                                continue;
                        if (*pe == EOS) {
                                /*
                                 * We could not find a matching RBRACKET.
                                 * Ignore and just look for RBRACE
                                 */
                                pe = pm;
                        }
                }
                else if (*pe == LBRACE)
                        i++;
                else if (*pe == RBRACE) {
                        if (i == 0)
                                break;
                        i--;
                }

        /* Non matching braces; just glob the pattern */
        if (i != 0 || *pe == EOS) {
                *rv = glob0(patbuf, pglob, limit);
                return 0;
        }

        for (i = 0, pl = pm = ptr; pm <= pe; pm++)
                switch (*pm) {
                case LBRACKET:
                        /* Ignore everything between [] */
                        for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
                                continue;
                        if (*pm == EOS) {
                                /*
                                 * We could not find a matching RBRACKET.
                                 * Ignore and just look for RBRACE
                                 */
                                pm = pl;
                        }
                        break;

                case LBRACE:
                        i++;
                        break;

                case RBRACE:
                        if (i) {
                            i--;
                            break;
                        }
                        /* FALLTHROUGH */
                case COMMA:
                        if (i && *pm == COMMA)
                                break;
                        else {
                                /* Append the current string */
                                for (lm = ls; (pl < pm); *lm++ = *pl++)
                                        continue;
                                /*
                                 * Append the rest of the pattern after the
                                 * closing brace
                                 */
                                for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
                                        continue;

                                /* Expand the current pattern */
#ifdef DEBUG
                                qprintf("globexp2:", patbuf);
#endif
                                *rv = globexp1(patbuf, pglob, limit);

                                /* move after the comma, to the next string */
                                pl = pm + 1;
                        }
                        break;

                default:
                        break;
                }
        *rv = 0;
        return 0;
}



/*
 * expand tilde from the passwd file.
 */
static const Char *
globtilde(pattern, patbuf, patbuf_len, pglob)
        const Char *pattern;
        Char *patbuf;
        size_t patbuf_len;
        glob_t *pglob;
{
        struct passwd *pwd;
        char *h;
        const Char *p;
        Char *b, *eb;

        if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
                return pattern;

        /* 
         * Copy up to the end of the string or / 
         */
        eb = &patbuf[patbuf_len - 1];
        for (p = pattern + 1, h = (char *) patbuf;
            h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
                continue;

        *h = EOS;

        if (((char *) patbuf)[0] == EOS) {
                /*
                 * handle a plain ~ or ~/ by expanding $HOME first (iff
                 * we're not running setuid or setgid) and then trying
                 * the password file
                 */
                if (
#ifndef __NETBSD_SYSCALLS
                    issetugid() != 0 ||
#endif
                    (h = getenv("HOME")) == NULL) {
/* If we are not EL/IX level 4, we cannot use getpwxxx interfaces */
#if !defined(_ELIX_LEVEL) || _ELIX_LEVEL >= 4
                        if (((h = getlogin()) != NULL &&
                             (pwd = getpwnam(h)) != NULL) ||
                            (pwd = getpwuid(getuid())) != NULL)
                                h = pwd->pw_dir;
                        else
#endif /* !_ELIX_LEVEL || _ELIX_LEVEL >= 4 */
                                return pattern;
                }
        }
        else {
                /*
                 * Expand a ~user
                 */

#if !defined(_ELIX_LEVEL) || _ELIX_LEVEL >= 4
                if ((pwd = getpwnam((char*) patbuf)) != NULL)
                        h = pwd->pw_dir;
                else
#endif /* !_ELIX_LEVEL || _ELIX_LEVEL >= 4 */
                        return pattern;
        }

        /* Copy the home directory */
        for (b = patbuf; b < eb && *h; *b++ = *h++)
                continue;

        /* Append the rest of the pattern */
        while (b < eb && (*b++ = *p++) != EOS)
                continue;
        *b = EOS;

        return patbuf;
}


/*
 * The main glob() routine: compiles the pattern (optionally processing
 * quotes), calls glob1() to do the real pattern matching, and finally
 * sorts the list (unless unsorted operation is requested).  Returns 0
 * if things went well, nonzero if errors occurred.  It is not an error
 * to find no matches.
 */
static int
glob0(pattern, pglob, limit)
        const Char *pattern;
        glob_t *pglob;
        int *limit;
{
        const Char *qpatnext;
        int c, err, oldpathc;
        Char *bufnext, patbuf[MAXPATHLEN];

        qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
        oldpathc = pglob->gl_pathc;
        bufnext = patbuf;

        /* We don't need to check for buffer overflow any more. */
        while ((c = *qpatnext++) != EOS) {
                switch (c) {
                case LBRACKET:
                        c = *qpatnext;
                        if (c == NOT)
                                ++qpatnext;
                        if (*qpatnext == EOS ||
                            g_strchr((Char *) qpatnext+1, RBRACKET) == NULL) {
                                *bufnext++ = LBRACKET;
                                if (c == NOT)
                                        --qpatnext;
                                break;
                        }
                        *bufnext++ = M_SET;
                        if (c == NOT)
                                *bufnext++ = M_NOT;
                        c = *qpatnext++;
                        do {
                                *bufnext++ = CHAR(c);
                                if (*qpatnext == RANGE &&
                                    (c = qpatnext[1]) != RBRACKET) {
                                        *bufnext++ = M_RNG;
                                        *bufnext++ = CHAR(c);
                                        qpatnext += 2;
                                }
                        } while ((c = *qpatnext++) != RBRACKET);
                        pglob->gl_flags |= GLOB_MAGCHAR;
                        *bufnext++ = M_END;
                        break;
                case QUESTION:
                        pglob->gl_flags |= GLOB_MAGCHAR;
                        *bufnext++ = M_ONE;
                        break;
                case STAR:
                        pglob->gl_flags |= GLOB_MAGCHAR;
                        /* collapse adjacent stars to one,
                         * to avoid exponential behavior
                         */
                        if (bufnext == patbuf || bufnext[-1] != M_ALL)
                            *bufnext++ = M_ALL;
                        break;
                default:
                        *bufnext++ = CHAR(c);
                        break;
                }
        }
        *bufnext = EOS;
#ifdef DEBUG
        qprintf("glob0:", patbuf);
#endif

        if ((err = glob1(patbuf, pglob, limit)) != 0)
                return(err);

        /*
         * If there was no match we are going to append the pattern
         * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
         * and the pattern did not contain any magic characters
         * GLOB_NOMAGIC is there just for compatibility with csh.
         */
        if (pglob->gl_pathc == oldpathc &&
            ((pglob->gl_flags & GLOB_NOCHECK) ||
              ((pglob->gl_flags & GLOB_NOMAGIC) &&
               !(pglob->gl_flags & GLOB_MAGCHAR))))
                return(globextend(pattern, pglob, limit));
        else if (!(pglob->gl_flags & GLOB_NOSORT))
                qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
                    pglob->gl_pathc - oldpathc, sizeof(char *), compare);
        return(0);
}

static int
compare(p, q)
        const void *p, *q;
{
        return(strcmp(*(char **)p, *(char **)q));
}

static int
glob1(pattern, pglob, limit)
        Char *pattern;
        glob_t *pglob;
        int *limit;
{
        Char pathbuf[MAXPATHLEN];

        /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
        if (*pattern == EOS)
                return(0);
        return(glob2(pathbuf, pathbuf, pathbuf + MAXPATHLEN - 1,
            pattern, pglob, limit));
}

/*
 * The functions glob2 and glob3 are mutually recursive; there is one level
 * of recursion for each segment in the pattern that contains one or more
 * meta characters.
 */
static int
glob2(pathbuf, pathend, pathend_last, pattern, pglob, limit)
        Char *pathbuf, *pathend, *pathend_last, *pattern;
        glob_t *pglob;
        int *limit;
{
        struct stat sb;
        Char *p, *q;
        int anymeta;

        /*
         * Loop over pattern segments until end of pattern or until
         * segment with meta character found.
         */
        for (anymeta = 0;;) {
                if (*pattern == EOS) {          /* End of pattern? */
                        *pathend = EOS;
                        if (g_lstat(pathbuf, &sb, pglob))
                                return(0);

                        if (((pglob->gl_flags & GLOB_MARK) &&
                            pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
                            || (S_ISLNK(sb.st_mode) &&
                            (g_stat(pathbuf, &sb, pglob) == 0) &&
                            S_ISDIR(sb.st_mode)))) {
                                if (pathend + 1 > pathend_last)
                                        return (1);
                                *pathend++ = SEP;
                                *pathend = EOS;
                        }
                        ++pglob->gl_matchc;
                        return(globextend(pathbuf, pglob, limit));
                }

                /* Find end of next segment, copy tentatively to pathend. */
                q = pathend;
                p = pattern;
                while (*p != EOS && *p != SEP) {
                        if (ismeta(*p))
                                anymeta = 1;
                        if (q + 1 > pathend_last)
                                return (1);
                        *q++ = *p++;
                }

                if (!anymeta) {         /* No expansion, do next segment. */
                        pathend = q;
                        pattern = p;
                        while (*pattern == SEP) {
                                if (pathend + 1 > pathend_last)
                                        return (1);
                                *pathend++ = *pattern++;
                        }
                } else                  /* Need expansion, recurse. */
                        return(glob3(pathbuf, pathend, pathend_last, pattern, p,
                            pglob, limit));
        }
        /* NOTREACHED */
}

static int
glob3(pathbuf, pathend, pathend_last, pattern, restpattern, pglob, limit)
        Char *pathbuf, *pathend, *pathend_last, *pattern, *restpattern;
        glob_t *pglob;
        int *limit;
{
        struct dirent *dp;
        DIR *dirp;
        int err;
        char buf[MAXPATHLEN];

        /*
         * The readdirfunc declaration can't be prototyped, because it is
         * assigned, below, to two functions which are prototyped in glob.h
         * and dirent.h as taking pointers to differently typed opaque
         * structures.
         */
        struct dirent *(*readdirfunc)();

        if (pathend > pathend_last)
                return (1);
        *pathend = EOS;
        errno = 0;

        if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
                /* TODO: don't call for ENOENT or ENOTDIR? */
                if (pglob->gl_errfunc) {
                        if (g_Ctoc(pathbuf, buf, sizeof(buf)))
                                return (GLOB_ABEND);
                        if (pglob->gl_errfunc(buf, errno) ||
                            pglob->gl_flags & GLOB_ERR)
                                return (GLOB_ABEND);
                }
                return(0);
        }

        err = 0;

        /* Search directory for matching names. */
        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                readdirfunc = pglob->gl_readdir;
        else
                readdirfunc = readdir;
        while ((dp = (*readdirfunc)(dirp))) {
                u_char *sc;
                Char *dc;

                /* Initial DOT must be matched literally. */
                if (dp->d_name[0] == DOT && *pattern != DOT)
                        continue;
                dc = pathend;
                sc = (u_char *) dp->d_name;
                while (dc < pathend_last && (*dc++ = *sc++) != EOS)
                        ;
                if (!match(pathend, pattern, restpattern)) {
                        *pathend = EOS;
                        continue;
                }
                err = glob2(pathbuf, --dc, pathend_last, restpattern,
                    pglob, limit);
                if (err)
                        break;
        }

        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                (*pglob->gl_closedir)(dirp);
        else
                closedir(dirp);
        return(err);
}


/*
 * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 * add the new item, and update gl_pathc.
 *
 * This assumes the BSD realloc, which only copies the block when its size
 * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 * behavior.
 *
 * Return 0 if new item added, error code if memory couldn't be allocated.
 *
 * Invariant of the glob_t structure:
 *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 */
static int
globextend(path, pglob, limit)
        const Char *path;
        glob_t *pglob;
        int *limit;
{
        char **pathv;
        int i;
        u_int newsize, len;
        char *copy;
        const Char *p;

        if (*limit && pglob->gl_pathc > *limit) {
                errno = 0;
                return (GLOB_NOSPACE);
        }

        newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
        pathv = pglob->gl_pathv ?
                    realloc((char *)pglob->gl_pathv, newsize) :
                    malloc(newsize);
        if (pathv == NULL) {
                if (pglob->gl_pathv) {
                        free(pglob->gl_pathv);
                        pglob->gl_pathv = NULL;
                }
                return(GLOB_NOSPACE);
        }

        if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
                /* first time around -- clear initial gl_offs items */
                pathv += pglob->gl_offs;
                for (i = pglob->gl_offs; --i >= 0; )
                        *--pathv = NULL;
        }
        pglob->gl_pathv = pathv;

        for (p = path; *p++;)
                continue;
        len = (size_t)(p - path);
        if ((copy = malloc(len)) != NULL) {
                if (g_Ctoc(path, copy, len)) {
                        free(copy);
                        return (GLOB_NOSPACE);
                }
                pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
        }
        pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
        return(copy == NULL ? GLOB_NOSPACE : 0);
}

/*
 * pattern matching function for filenames.  Each occurrence of the *
 * pattern causes a recursion level.
 */
static int
match(name, pat, patend)
        Char *name, *pat, *patend;
{
        int ok, negate_range;
        Char c, k;

        while (pat < patend) {
                c = *pat++;
                switch (c & M_MASK) {
                case M_ALL:
                        if (pat == patend)
                                return(1);
                        do
                            if (match(name, pat, patend))
                                    return(1);
                        while (*name++ != EOS);
                        return(0);
                case M_ONE:
                        if (*name++ == EOS)
                                return(0);
                        break;
                case M_SET:
                        ok = 0;
                        if ((k = *name++) == EOS)
                                return(0);
                        if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
                                ++pat;
                        while (((c = *pat++) & M_MASK) != M_END)
                                if ((*pat & M_MASK) == M_RNG) {
                                        if (__collate_load_error ?
                                            CHAR(c) <= CHAR(k) && CHAR(k) <= CHAR(pat[1]) :
                                               __collate_range_cmp(CHAR(c), CHAR(k)) <= 0
                                            && __collate_range_cmp(CHAR(k), CHAR(pat[1])) <= 0
                                           )
                                                ok = 1;
                                        pat += 2;
                                } else if (c == k)
                                        ok = 1;
                        if (ok == negate_range)
                                return(0);
                        break;
                default:
                        if (*name++ != c)
                                return(0);
                        break;
                }
        }
        return(*name == EOS);
}

/* Free allocated data belonging to a glob_t structure. */
void
globfree(pglob)
        glob_t *pglob;
{
        int i;
        char **pp;

        if (pglob->gl_pathv != NULL) {
                pp = pglob->gl_pathv + pglob->gl_offs;
                for (i = pglob->gl_pathc; i--; ++pp)
                        if (*pp)
                                free(*pp);
                free(pglob->gl_pathv);
                pglob->gl_pathv = NULL;
        }
}

static DIR *
g_opendir(str, pglob)
        Char *str;
        glob_t *pglob;
{
        char buf[MAXPATHLEN];

        if (!*str)
                strcpy(buf, ".");
        else {
                if (g_Ctoc(str, buf, sizeof(buf)))
                        return (NULL);
        }

        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                return((*pglob->gl_opendir)(buf));

        return(opendir(buf));
}

static int
g_lstat(fn, sb, pglob)
        Char *fn;
        struct stat *sb;
        glob_t *pglob;
{
        char buf[MAXPATHLEN];

        if (g_Ctoc(fn, buf, sizeof(buf))) {
                errno = ENAMETOOLONG;
                return (-1);
        }
        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                return((*pglob->gl_lstat)(buf, sb));
        return(lstat(buf, sb));
}

static int
g_stat(fn, sb, pglob)
        Char *fn;
        struct stat *sb;
        glob_t *pglob;
{
        char buf[MAXPATHLEN];

        if (g_Ctoc(fn, buf, sizeof(buf))) {
                errno = ENAMETOOLONG;
                return (-1);
        }
        if (pglob->gl_flags & GLOB_ALTDIRFUNC)
                return((*pglob->gl_stat)(buf, sb));
        return(stat(buf, sb));
}

static Char *
g_strchr(str, ch)
        Char *str;
        int ch;
{
        do {
                if (*str == ch)
                        return (str);
        } while (*str++);
        return (NULL);
}

static int
g_Ctoc(str, buf, len)
        const Char *str;
        char *buf;
        u_int len;
{

        while (len--) {
                if ((*buf++ = *str++) == '\0')
                        return (0);
        }
        return (1);
}

#ifdef DEBUG
static void
qprintf(str, s)
        const char *str;
        Char *s;
{
        Char *p;

        (void)printf("%s:\n", str);
        for (p = s; *p; p++)
                (void)printf("%c", CHAR(*p));
        (void)printf("\n");
        for (p = s; *p; p++)
                (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
        (void)printf("\n");
        for (p = s; *p; p++)
                (void)printf("%c", ismeta(*p) ? '_' : ' ');
        (void)printf("\n");
}
#endif
#endif /*  !_NO_GLOB */