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glob.c

/*
 * Copyright (c) 1989 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.
 * 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 char sccsid[] = "@(#)glob.c  5.12 (Berkeley) 6/24/91";
#endif /* LIBC_SCCS and not lint */
/*
 * Glob: the interface is a superset of the one defined in POSIX 1003.2,
 * draft 9.
 *
 * 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_ALTNOT:
 *    Use ^ instead of ! for "not".
 * gl_matchc:
 *    Number of matches in the current invocation of glob.
 */

#ifdef WINNT_NATIVE
      #pragma warning(disable:4244)
#endif /* WINNT_NATIVE */

#define Char __Char
#include "sh.h"
#include "glob.h"

#undef Char
#undef QUOTE
#undef TILDE
#undef META
#undef ismeta
#undef Strchr

#ifndef S_ISDIR
#define S_ISDIR(a)      (((a) & S_IFMT) == S_IFDIR)
#endif

#if !defined(S_ISLNK) && defined(S_IFLNK)
#define S_ISLNK(a)      (((a) & S_IFMT) == S_IFLNK)
#endif

#if !defined(S_ISLNK) && !defined(lstat)
#define lstat stat
#endif

typedef unsigned short Char;

static      int    glob1            (Char *, glob_t *, int);
static      int    glob2            (struct strbuf *, const Char *, glob_t *, int);
static      int    glob3            (struct strbuf *, const Char *, const Char *,
                         const Char *, glob_t *, int);
static      void   globextend (const char *, glob_t *);
static      int    match            (const char *, const Char *, const Char *,
                         int);
static      int    compare    (const void *, const void *);
static      DIR   *Opendir    (const char *);
#ifdef S_IFLNK
static      int    Lstat            (const char *, struct stat *);
#endif
static      int    Stat       (const char *, struct stat *sb);
static      Char  *Strchr           (Char *, int);
#ifdef DEBUG
static      void   qprintf    (const Char *);
#endif

#define     DOLLAR            '$'
#define     DOT         '.'
#define     EOS         '\0'
#define     LBRACKET    '['
#define     NOT         '!'
#define ALTNOT          '^'
#define     QUESTION    '?'
#define     QUOTE       '\\'
#define     RANGE       '-'
#define     RBRACKET    ']'
#define     SEP         '/'
#define     STAR        '*'
#define     TILDE       '~'
#define     UNDERSCORE  '_'

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

#define     LCHAR(c)    ((c)&M_ASCII)
#define     META(c)           ((c)|M_META)
#define     M_ALL       META('*')
#define     M_END       META(']')
#define     M_NOT       META('!')
#define     M_ALTNOT    META('^')
#define     M_ONE       META('?')
#define     M_RNG       META('-')
#define     M_SET       META('[')
#define     ismeta(c)   (((c)&M_META) != 0)

int
globcharcoll(__Char c1, __Char c2, int cs)
{
#if defined(NLS) && defined(LC_COLLATE) && defined(HAVE_STRCOLL)
# if defined(WIDE_STRINGS)
    wchar_t s1[2], s2[2];

    if (c1 == c2)
      return (0);
    if (cs) {
      c1 = towlower(c1);
      c2 = towlower(c2);
    } else {
      /* This should not be here, but I'll rather leave it in than engage in
         a LC_COLLATE flamewar about a shell I don't use... */
      if (iswlower(c1) && iswupper(c2))
          return (1);
      if (iswupper(c1) && iswlower(c2))
          return (-1);
    }
    s1[0] = c1;
    s2[0] = c2;
    s1[1] = s2[1] = '\0';
    return wcscoll(s1, s2);
# else /* not WIDE_STRINGS */
    char s1[2], s2[2];

    if (c1 == c2)
      return (0);
    /*
     * From kevin lyda <kevin@suberic.net>:
     * strcoll does not guarantee case sorting, so we pre-process now:
     */
    if (cs) {
      c1 = islower(c1) ? c1 : tolower(c1);
      c2 = islower(c2) ? c2 : tolower(c2);
    } else {
      if (islower(c1) && isupper(c2))
          return (1);
      if (isupper(c1) && islower(c2))
          return (-1);
    }
    s1[0] = c1;
    s2[0] = c2;
    s1[1] = s2[1] = '\0';
    return strcoll(s1, s2);
# endif
#else
    return (c1 - c2);
#endif
}

/*
 * Need to dodge two kernel bugs:
 * opendir("") != opendir(".")
 * NAMEI_BUG: on plain files trailing slashes are ignored in some kernels.
 *            POSIX specifies that they should be ignored in directories.
 */

static DIR *
Opendir(const char *str)
{
#if defined(hpux) || defined(__hpux)
    struct stat st;
#endif

    if (!*str)
      return (opendir("."));
#if defined(hpux) || defined(__hpux)
    /*
     * Opendir on some device files hangs, so avoid it
     */
    if (stat(str, &st) == -1 || !S_ISDIR(st.st_mode))
      return NULL;
#endif
    return opendir(str);
}

#ifdef S_IFLNK
static int
Lstat(const char *fn, struct stat *sb)
{
    int st;

    st = lstat(fn, sb);
# ifdef NAMEI_BUG
    if (*fn != 0 && strend(fn)[-1] == '/' && !S_ISDIR(sb->st_mode))
      st = -1;
# endif     /* NAMEI_BUG */
    return st;
}
#else
#define Lstat Stat
#endif /* S_IFLNK */

static int
Stat(const char *fn, struct stat *sb)
{
    int st;

    st = stat(fn, sb);
#ifdef NAMEI_BUG
    if (*fn != 0 && strend(fn)[-1] == '/' && !S_ISDIR(sb->st_mode))
      st = -1;
#endif /* NAMEI_BUG */
    return st;
}

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

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

    for (p = s; *p; p++)
      printf("%c", *p & 0xff);
    printf("\n");
    for (p = s; *p; p++)
      printf("%c", *p & M_PROTECT ? '"' : ' ');
    printf("\n");
    for (p = s; *p; p++)
      printf("%c", *p & M_META ? '_' : ' ');
    printf("\n");
}
#endif /* DEBUG */

static int
compare(const void *p, const void *q)
{
#if defined(NLS) && defined(HAVE_STRCOLL)
    return (strcoll(*(char *const *) p, *(char *const *) q));
#else
    return (strcmp(*(char *const *) p, *(char *const *) q));
#endif /* NLS && HAVE_STRCOLL */
}

/*
 * 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.
 */
int
glob(const char *pattern, int flags, int (*errfunc) (const char *, int),
     glob_t *pglob)
{
    int     err, oldpathc;
    Char *bufnext, m_not;
    const unsigned char *patnext;
    int     c, not;
    Char *qpatnext, *patbuf;
    int     no_match;

    patnext = (const unsigned char *) pattern;
    if (!(flags & GLOB_APPEND)) {
      pglob->gl_pathc = 0;
      pglob->gl_pathv = NULL;
      if (!(flags & GLOB_DOOFFS))
          pglob->gl_offs = 0;
    }
    pglob->gl_flags = flags & ~GLOB_MAGCHAR;
    pglob->gl_errfunc = errfunc;
    oldpathc = pglob->gl_pathc;
    pglob->gl_matchc = 0;

    if (pglob->gl_flags & GLOB_ALTNOT) {
      not = ALTNOT;
      m_not = M_ALTNOT;
    }
    else {
      not = NOT;
      m_not = M_NOT;
    }

    patbuf = xmalloc((strlen(pattern) + 1) * sizeof(*patbuf));
    bufnext = patbuf;

    no_match = *patnext == not;
    if (no_match)
      patnext++;

    if (flags & GLOB_QUOTE) {
      /* Protect the quoted characters */
      while ((c = *patnext++) != EOS) {
#ifdef WIDE_STRINGS
          int len;
          
          len = mblen((const char *)(patnext - 1), MB_LEN_MAX);
          if (len == -1)
            TCSH_IGNORE(mblen(NULL, 0));
          else if (len > 1) {
            *bufnext++ = (Char) c;
            while (--len != 0)
                *bufnext++ = (Char) (*patnext++ | M_PROTECT);
          } else
#endif /* WIDE_STRINGS */
          if (c == QUOTE) {
            if ((c = *patnext++) == EOS) {
                c = QUOTE;
                --patnext;
            }
            *bufnext++ = (Char) (c | M_PROTECT);
          }
          else
            *bufnext++ = (Char) c;
      }
    }
    else
      while ((c = *patnext++) != EOS)
          *bufnext++ = (Char) c;
    *bufnext = EOS;

    bufnext = patbuf;
    qpatnext = patbuf;
    while ((c = *qpatnext++) != EOS) {
      switch (c) {
      case LBRACKET:
          c = *qpatnext;
          if (c == not)
            ++qpatnext;
          if (*qpatnext == EOS ||
            Strchr(qpatnext + 1, RBRACKET) == NULL) {
            *bufnext++ = LBRACKET;
            if (c == not)
                --qpatnext;
            break;
          }
          pglob->gl_flags |= GLOB_MAGCHAR;
          *bufnext++ = M_SET;
          if (c == not)
            *bufnext++ = m_not;
          c = *qpatnext++;
          do {
            *bufnext++ = LCHAR(c);
            if (*qpatnext == RANGE &&
                (c = qpatnext[1]) != RBRACKET) {
                *bufnext++ = M_RNG;
                *bufnext++ = LCHAR(c);
                qpatnext += 2;
            }
          } while ((c = *qpatnext++) != RBRACKET);
          *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 [or three if globstar],
           * to avoid exponential behavior
           */
          if (bufnext == patbuf || bufnext[-1] != M_ALL ||
             ((flags & GLOB_STAR) != 0 && 
             (bufnext - 1 == patbuf || bufnext[-2] != M_ALL ||
             bufnext - 2 == patbuf || bufnext[-3] != M_ALL)))
            *bufnext++ = M_ALL;
          break;
      default:
          *bufnext++ = LCHAR(c);
          break;
      }
    }
    *bufnext = EOS;
#ifdef DEBUG
    qprintf(patbuf);
#endif

    if ((err = glob1(patbuf, pglob, no_match)) != 0) {
      xfree(patbuf);
      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 && 
      ((flags & GLOB_NOCHECK) || 
       ((flags & GLOB_NOMAGIC) && !(pglob->gl_flags & GLOB_MAGCHAR)))) {
      if (!(flags & GLOB_QUOTE))
          globextend(pattern, pglob);
      else {
          char *copy, *dest;
          const char *src;

          /* copy pattern, interpreting quotes */
          copy = xmalloc(strlen(pattern) + 1);
          dest = copy;
          src = pattern;
          while (*src != EOS) {
            if (*src == QUOTE) {
                if (*++src == EOS)
                  --src;
            }
            *dest++ = *src++;
          }
          *dest = EOS;
          globextend(copy, pglob);
          xfree(copy);
      }
      xfree(patbuf);
      return 0;
    }
    else if (!(flags & GLOB_NOSORT) && (pglob->gl_pathc != oldpathc))
      qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
            pglob->gl_pathc - oldpathc, sizeof(char *), compare);
    xfree(patbuf);
    return (0);
}

static int
glob1(Char *pattern, glob_t *pglob, int no_match)
{
    struct strbuf pathbuf = strbuf_INIT;
    int err;

    /*
     * a null pathname is invalid -- POSIX 1003.1 sect. 2.4.
     */
    if (*pattern == EOS)
      return (0);
    err = glob2(&pathbuf, pattern, pglob, no_match);
    xfree(pathbuf.s);
    return err;
}

/*
 * 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(struct strbuf *pathbuf, const Char *pattern, glob_t *pglob, int no_match)
{
    struct stat sbuf;
    int anymeta;
    const Char *p;
    size_t orig_len;

    /*
     * loop over pattern segments until end of pattern or until segment with
     * meta character found.
     */
    anymeta = 0;
    for (;;) {
      if (*pattern == EOS) {  /* end of pattern? */
          strbuf_terminate(pathbuf);

          if (Lstat(pathbuf->s, &sbuf))
            return (0);

          if (((pglob->gl_flags & GLOB_MARK) &&
             pathbuf->s[pathbuf->len - 1] != SEP) &&
            (S_ISDIR(sbuf.st_mode)
#ifdef S_IFLNK
             || (S_ISLNK(sbuf.st_mode) &&
                 (Stat(pathbuf->s, &sbuf) == 0) &&
                 S_ISDIR(sbuf.st_mode))
#endif
             )) {
            strbuf_append1(pathbuf, SEP);
            strbuf_terminate(pathbuf);
          }
          ++pglob->gl_matchc;
          globextend(pathbuf->s, pglob);
          return 0;
      }

      /* find end of next segment, tentatively copy to pathbuf */
      p = pattern;
      orig_len = pathbuf->len;
      while (*p != EOS && *p != SEP) {
          if (ismeta(*p))
            anymeta = 1;
          strbuf_append1(pathbuf, *p++);
      }

      if (!anymeta) {         /* no expansion, do next segment */
          pattern = p;
          while (*pattern == SEP)
            strbuf_append1(pathbuf, *pattern++);
      }
      else {                  /* need expansion, recurse */
          pathbuf->len = orig_len;
          return (glob3(pathbuf, pattern, p, pattern, pglob, no_match));
      }
    }
    /* NOTREACHED */
}

static size_t
One_Char_mbtowc(__Char *pwc, const Char *s, size_t n)
{
#ifdef WIDE_STRINGS
    char buf[MB_LEN_MAX], *p;

    if (n > MB_LEN_MAX)
      n = MB_LEN_MAX;
    p = buf;
    while (p < buf + n && (*p++ = LCHAR(*s++)) != 0)
      ;
    return one_mbtowc(pwc, buf, n);
#else
    *pwc = *s & CHAR;
    return 1;
#endif
}
 
static int
glob3(struct strbuf *pathbuf, const Char *pattern, const Char *restpattern,
      const Char *pglobstar, glob_t *pglob, int no_match)
{
    DIR    *dirp;
    struct dirent *dp;
    struct stat sbuf;
    int     err;
    Char m_not = (pglob->gl_flags & GLOB_ALTNOT) ? M_ALTNOT : M_NOT;
    size_t orig_len;
    int globstar = 0;
    int chase_symlinks = 0;
    const Char *termstar = NULL;

    strbuf_terminate(pathbuf);
    orig_len = pathbuf->len;
    errno = err = 0;

    while (pglobstar < restpattern) {
      __Char wc;
      size_t width = One_Char_mbtowc(&wc, pglobstar, MB_LEN_MAX);
      if ((pglobstar[0] & M_MASK) == M_ALL &&
          (pglobstar[width] & M_MASK) == M_ALL) {
          globstar = 1;
          chase_symlinks = (pglobstar[2 * width] & M_MASK) == M_ALL;
          termstar = pglobstar + (2 + chase_symlinks) * width;
          break;
      }
        pglobstar += width;
    } 

    if (globstar) {
      err = pglobstar==pattern && termstar==restpattern ?
            *restpattern == EOS ?
            glob2(pathbuf, restpattern - 1, pglob, no_match) :
            glob2(pathbuf, restpattern + 1, pglob, no_match) :
            glob3(pathbuf, pattern, restpattern, termstar, pglob, no_match);
      if (err)
          return err;
      pathbuf->len = orig_len;
      strbuf_terminate(pathbuf);
    }

    if (*pathbuf->s && (Lstat(pathbuf->s, &sbuf) || !S_ISDIR(sbuf.st_mode)
#ifdef S_IFLINK
           && ((globstar && !chase_symlinks) || !S_ISLNK(sbuf.st_mode))
#endif
      ))
      return 0;

    if (!(dirp = Opendir(pathbuf->s))) {
      /* todo: don't call for ENOENT or ENOTDIR? */
      if ((pglob->gl_errfunc && (*pglob->gl_errfunc) (pathbuf->s, errno)) ||
          (pglob->gl_flags & GLOB_ERR))
          return (GLOB_ABEND);
      else
          return (0);
    }

    /* search directory for matching names */
    while ((dp = readdir(dirp)) != NULL) {
      /* initial DOT must be matched literally */
      if (dp->d_name[0] == DOT && *pattern != DOT)
          if (!(pglob->gl_flags & GLOB_DOT) || !dp->d_name[1] ||
            (dp->d_name[1] == DOT && !dp->d_name[2]))
            continue; /*unless globdot and not . or .. */
      pathbuf->len = orig_len;
      strbuf_append(pathbuf, dp->d_name);
      strbuf_terminate(pathbuf);

      if (globstar) {
#ifdef S_IFLNK
          if (!chase_symlinks &&
            (Lstat(pathbuf->s, &sbuf) || S_ISLNK(sbuf.st_mode)))
                continue;
#endif
          if (match(pathbuf->s + orig_len, pattern, termstar,
            (int)m_not) == no_match) 
                continue;
          strbuf_append1(pathbuf, SEP);
          strbuf_terminate(pathbuf);
          if ((err = glob2(pathbuf, pglobstar, pglob, no_match)) != 0)
            break;
      } else {
          if (match(pathbuf->s + orig_len, pattern, restpattern,
            (int) m_not) == no_match)
            continue;
          if ((err = glob2(pathbuf, restpattern, pglob, no_match)) != 0)
            break;
      }
    }
    /* todo: check error from readdir? */
    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 void
globextend(const char *path, glob_t *pglob)
{
    char **pathv;
    int i;
    size_t newsize;

    newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
    pathv = xrealloc(pglob->gl_pathv, newsize);

    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;

    pathv[pglob->gl_offs + pglob->gl_pathc++] = strsave(path);
    pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
}

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

    while (pat < patend) {
      size_t lwk;
      __Char wc, wk;

      c = *pat; /* Only for M_MASK bits */
      pat += One_Char_mbtowc(&wc, pat, MB_LEN_MAX);
      lwk = one_mbtowc(&wk, name, MB_LEN_MAX);
      switch (c & M_MASK) {
      case M_ALL:
          while (pat < patend && (*pat & M_MASK) == M_ALL)  /* eat consecutive '*' */
            pat += One_Char_mbtowc(&wc, pat, MB_LEN_MAX);
          if (pat == patend)
              return (1);
          while (!match(name, pat, patend, m_not)) {
            if (*name == EOS)
                return (0);
            name += lwk;
            lwk = one_mbtowc(&wk, name, MB_LEN_MAX);
          }
          return (1);
      case M_ONE:
          if (*name == EOS)
            return (0);
          name += lwk;
          break;
      case M_SET:
          ok = 0;
          if (*name == EOS)
            return (0);
          name += lwk;
          if ((negate_range = ((*pat & M_MASK) == m_not)) != 0)
            ++pat;
          while ((*pat & M_MASK) != M_END) {
            pat += One_Char_mbtowc(&wc, pat, MB_LEN_MAX);
            if ((*pat & M_MASK) == M_RNG) {
                __Char wc2;

                pat++;
                pat += One_Char_mbtowc(&wc2, pat, MB_LEN_MAX);
                if (globcharcoll(wc, wk, 0) <= 0 &&
                  globcharcoll(wk, wc2, 0) <= 0)
                  ok = 1;
            } else if (wc == wk)
                ok = 1;
          }
          pat += One_Char_mbtowc(&wc, pat, MB_LEN_MAX);
          if (ok == negate_range)
            return (0);
          break;
      default:
          if (*name == EOS || samecase(wk) != samecase(wc))
            return (0);
          name += lwk;
          break;
      }
    }
    return (*name == EOS);
}

/* free allocated data belonging to a glob_t structure */
void
globfree(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)
            xfree(*pp), *pp = NULL;
      xfree(pglob->gl_pathv), pglob->gl_pathv = NULL;
    }
}

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