validate canons without yatest_common

1 files changed, 921 insertions, 0 deletions

diff --git a/library/cpp/regex/glob/glob.cpp b/library/cpp/regex/glob/glob.cpp
new file mode 100644
index 0000000000..9da058122a
--- /dev/null
+++ b/library/cpp/regex/glob/glob.cpp
@@ -0,0 +1,921 @@
+#define FROM_IMPLEMENTATION
+#include "glob_compat.h"
+
+#if defined(USE_INTERNAL_GLOB)
+/*
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    This product includes software developed by the University of
+ *    California, Berkeley and its contributors.
+ * 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.
+ */
+
+#include <library/cpp/charset/ci_string.h>
+#include <util/system/compat.h>
+#include <util/folder/dirut.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.
+ */
+
+/*
+ * Some notes on multibyte character support:
+ * 1. Patterns with illegal byte sequences match nothing - even if
+ *    GLOB_NOCHECK is specified.
+ * 2. Illegal byte sequences in filenames are handled by treating them as
+ *    single-byte characters with a value of the first byte of the sequence
+ *    cast to wchar_t.
+ * 3. State-dependent encodings are not currently supported.
+ */
+
+//#include <sys/param.h>
+#include <sys/stat.h>
+
+#include <ctype.h>
+//#include <dirent.h>
+#include <errno.h>
+#include <limits.h>
+//#include <pwd.h>
+//#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#if defined(_unix_)
+#include <unistd.h>
+#endif
+#include <wchar.h>
+
+#if !defined(_unix_)
+// silly replacement for compilation
+using uint_fast64_t = ui64;
+using u_int = unsigned int;
+using u_char = unsigned char;
+#define ARG_MAX 256
+#define S_ISDIR(x) ((x) & _S_IFDIR)
+#define S_ISLNK(x) 0
+#define lstat stat
+inline bool issetugid() { return false; }
+inline char *getlogin() { return 0; }
+inline int getuid() { return 0; }
+struct passwd {
+    char *pw_dir;
+};
+inline passwd *getpwuid(int) { return 0; }
+inline passwd *getpwnam(char *) { return 0; }
+#endif
+
+#define __collate_load_error 1
+inline int __collate_range_cmp(int, int) { return 0; }
+#undef COMMA // was defined in stroka.h
+// end silly replacement
+
+//#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        0x8000000000ULL
+#define    M_PROTECT    0x4000000000ULL
+#define    M_MASK        0xffffffffffULL
+#define    M_CHAR        0x00ffffffffULL
+
+using Char = uint_fast64_t;
+
+#else
+
+#define    M_QUOTE        0x80
+#define    M_PROTECT    0x40
+#define    M_MASK        0xff
+#define    M_CHAR        0x7f
+
+using Char = char;
+
+#endif
+
+
+#define    CHAR(c)        ((Char)((c)&M_CHAR))
+#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 *, wchar_t);
+#ifdef notdef
+static Char    *g_strcat(Char *, const Char *);
+#endif
+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(const char *pattern, int flags, int (*errfunc)(const char *, int), glob_t *pglob)
+{
+    const u_char *patnext;
+    int limit;
+    Char *bufnext, *bufend, patbuf[MAXPATHLEN], prot;
+    mbstate_t mbs;
+    wchar_t wc;
+    size_t clen;
+
+    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_NOESCAPE) {
+        memset(&mbs, 0, sizeof(mbs));
+        while (bufend - bufnext >= MB_CUR_MAX) {
+            clen = mbrtowc(&wc, (const char*)patnext, MB_LEN_MAX, &mbs);
+            if (clen == (size_t)-1 || clen == (size_t)-2)
+                return (GLOB_NOMATCH);
+            else if (clen == 0)
+                break;
+            *bufnext++ = wc;
+            patnext += clen;
+        }
+    } else {
+        /* Protect the quoted characters. */
+        memset(&mbs, 0, sizeof(mbs));
+        while (bufend - bufnext >= MB_CUR_MAX) {
+            if (*patnext == QUOTE) {
+                if (*++patnext == EOS) {
+                    *bufnext++ = QUOTE | M_PROTECT;
+                    continue;
+                }
+                prot = M_PROTECT;
+            } else
+                prot = 0;
+            clen = mbrtowc(&wc, (const char*)patnext, MB_LEN_MAX, &mbs);
+            if (clen == (size_t)-1 || clen == (size_t)-2)
+                return (GLOB_NOMATCH);
+            else if (clen == 0)
+                break;
+            *bufnext++ = wc | prot;
+            patnext += clen;
+        }
+    }
+    *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(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(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv, int *limit)
+{
+    int     i;
+    Char   *lm, *ls;
+    const Char *pe, *pm, *pm1, *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 (pm1 = pm++; *pm != RBRACKET && *pm != EOS; pm++)
+                continue;
+            if (*pm == EOS) {
+                /*
+                 * We could not find a matching RBRACKET.
+                 * Ignore and just look for RBRACE
+                 */
+                pm = pm1;
+            }
+            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(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++ = (char)*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 (issetugid() != 0 ||
+            (h = ::getenv("HOME")) == NULL) {
+            if (((h = getlogin()) != NULL &&
+                 (pwd = getpwnam(h)) != NULL) ||
+                (pwd = getpwuid(getuid())) != NULL)
+                h = pwd->pw_dir;
+            else
+                return pattern;
+        }
+    }
+    else {
+        /*
+         * Expand a ~user
+         */
+        if ((pwd = getpwnam((char*) patbuf)) == NULL)
+            return pattern;
+        else
+            h = pwd->pw_dir;
+    }
+
+    /* 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.
+ */
+static int
+glob0(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 = (char)*qpatnext++) != EOS) {
+        switch (c) {
+        case LBRACKET:
+            c = (char)*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 = (char)*qpatnext++;
+            do {
+                *bufnext++ = CHAR(c);
+                if (*qpatnext == RANGE &&
+                    (c = (char)qpatnext[1]) != RBRACKET) {
+                    *bufnext++ = M_RNG;
+                    *bufnext++ = CHAR(c);
+                    qpatnext += 2;
+                }
+            } while ((c = (char)*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) {
+        if (((pglob->gl_flags & GLOB_NOCHECK) ||
+            ((pglob->gl_flags & GLOB_NOMAGIC) &&
+            !(pglob->gl_flags & GLOB_MAGCHAR))))
+            return(globextend(pattern, pglob, limit));
+        else
+            return(GLOB_NOMATCH);
+    }
+    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(const void *p, const void *q)
+{
+    return(strcmp(*(char **)p, *(char **)q));
+}
+
+static int
+glob1(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(Char *pathbuf, Char *pathend, Char *pathend_last, Char *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))) {
+                if (pathend + 1 > pathend_last)
+                    return (GLOB_ABORTED);
+                *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 (GLOB_ABORTED);
+            *q++ = *p++;
+        }
+
+        if (!anymeta) {        /* No expansion, do next segment. */
+            pathend = q;
+            pattern = p;
+            while (*pattern == SEP) {
+                if (pathend + 1 > pathend_last)
+                    return (GLOB_ABORTED);
+                *pathend++ = *pattern++;
+            }
+        } else            /* Need expansion, recurse. */
+            return(glob3(pathbuf, pathend, pathend_last, pattern, p,
+                pglob, limit));
+    }
+    /* NOTREACHED */
+}
+
+static int
+glob3(Char *pathbuf, Char *pathend, Char *pathend_last, Char *pattern, Char *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.
+     */
+    typedef struct dirent *(*readdirfunc_t)(void*);
+    readdirfunc_t readdirfunc;
+
+    if (pathend > pathend_last)
+        return (GLOB_ABORTED);
+    *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_ABORTED);
+            if (pglob->gl_errfunc(buf, errno) ||
+                pglob->gl_flags & GLOB_ERR)
+                return (GLOB_ABORTED);
+        }
+        return(0);
+    }
+
+    err = 0;
+
+    /* Search directory for matching names. */
+    if (pglob->gl_flags & GLOB_ALTDIRFUNC)
+        readdirfunc = pglob->gl_readdir;
+    else
+        readdirfunc = (readdirfunc_t)readdir;
+    while ((dp = (*readdirfunc)(dirp))) {
+        u_char *sc;
+        Char *dc;
+        wchar_t wc;
+        size_t clen;
+        mbstate_t mbs;
+
+        /* Initial DOT must be matched literally. */
+        if (dp->d_name[0] == DOT && *pattern != DOT)
+            continue;
+        memset(&mbs, 0, sizeof(mbs));
+        dc = pathend;
+        sc = (u_char *) dp->d_name;
+        while (dc < pathend_last) {
+            clen = mbrtowc(&wc, (const char*)sc, MB_LEN_MAX, &mbs);
+            if (clen == (size_t)-1 || clen == (size_t)-2) {
+                wc = *sc;
+                clen = 1;
+                memset(&mbs, 0, sizeof(mbs));
+            }
+            if ((*dc++ = wc) == EOS)
+                break;
+            sc += clen;
+        }
+        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(const Char *path, glob_t *pglob, int *limit)
+{
+    char **pathv;
+    int i;
+    size_t 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 ?
+            (char**)realloc((char *)pglob->gl_pathv, newsize) :
+            (char**)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 = MB_CUR_MAX * (size_t)(p - path);    /* XXX overallocation */
+    if ((copy = (char*)malloc(len)) != NULL) {
+        if (g_Ctoc(path, copy, (u_int)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(Char *name, Char *pat, Char *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((int)CHAR(c), (int)CHAR(k)) <= 0
+                        && __collate_range_cmp((int)CHAR(k), (int)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(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(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 (DIR*)((*pglob->gl_opendir)(buf));
+
+    return(opendir(buf));
+}
+
+static int
+g_lstat(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 Char *
+g_strchr(Char *str, wchar_t ch)
+{
+    do {
+        if (*str == ch)
+            return (str);
+    } while (*str++);
+    return (NULL);
+}
+
+static int
+g_Ctoc(const Char *str, char *buf, u_int len)
+{
+    mbstate_t mbs;
+    size_t clen;
+
+    memset(&mbs, 0, sizeof(mbs));
+    while ((int)len >= MB_CUR_MAX) {
+        clen = wcrtomb(buf, (wchar_t)*str, &mbs);
+        if (clen == (size_t)-1)
+            return (1);
+        if (*str == L'\0')
+            return (0);
+        str++;
+        buf += clen;
+        len -= (u_int)clen;
+    }
+    return (1);
+}
+
+#ifdef DEBUG
+static void
+qprintf(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