557 lines
13 KiB
C
557 lines
13 KiB
C
/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Guido van Rossum.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)glob.c 5.12 (Berkeley) 6/24/91";
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#endif /* LIBC_SCCS and not lint */
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/*
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* glob(3) -- a superset of the one defined in POSIX 1003.2.
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*
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* The [!...] convention to negate a range is supported (SysV, Posix, ksh).
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*
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* Optional extra services, controlled by flags not defined by POSIX:
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*
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* GLOB_QUOTE:
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* Escaping convention: \ inhibits any special meaning the following
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* character might have (except \ at end of string is retained).
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* GLOB_MAGCHAR:
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* Set in gl_flags if pattern contained a globbing character.
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* gl_matchc:
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* Number of matches in the current invocation of glob.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <glob.h>
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#include <ctype.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define DOLLAR '$'
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#define DOT '.'
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#define EOS '\0'
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#define LBRACKET '['
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#define NOT '!'
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#define QUESTION '?'
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#define QUOTE '\\'
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#define RANGE '-'
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#define RBRACKET ']'
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#define SEP '/'
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#define STAR '*'
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#define TILDE '~'
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#define UNDERSCORE '_'
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#define M_QUOTE 0x8000
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#define M_PROTECT 0x4000
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#define M_MASK 0xffff
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#define M_ASCII 0x00ff
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#define CHAR(c) ((c)&M_ASCII)
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#define META(c) ((c)|M_QUOTE)
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#define M_ALL META('*')
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#define M_END META(']')
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#define M_NOT META('!')
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#define M_ONE META('?')
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#define M_RNG META('-')
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#define M_SET META('[')
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#define ismeta(c) (((c)&M_QUOTE) != 0)
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typedef u_short Char;
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static int compare __P((const void *, const void *));
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static void g_Ctoc __P((Char *, char *));
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static int g_lstat __P((Char *, struct stat *));
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static DIR *g_opendir __P((Char *));
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static Char *g_strchr __P((Char *, int));
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static int g_stat __P((Char *, struct stat *));
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static int glob1 __P((Char *, glob_t *));
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static int glob2 __P((Char *, Char *, Char *, glob_t *));
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static int glob3 __P((Char *, Char *, Char *, Char *, glob_t *));
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static int globextend __P((Char *, glob_t *));
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static int match __P((Char *, Char *, Char *));
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#ifdef DEBUG
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static void qprintf __P((Char *));
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#endif
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/*
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* The main glob() routine: compiles the pattern (optionally processing
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* quotes), calls glob1() to do the real pattern matching, and finally
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* sorts the list (unless unsorted operation is requested). Returns 0
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* if things went well, nonzero if errors occurred. It is not an error
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* to find no matches.
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*/
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glob(pattern, flags, errfunc, pglob)
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const char *pattern;
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int flags, (*errfunc) __P((char *, int));
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glob_t *pglob;
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{
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const u_char *compilepat, *patnext;
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int c, err, oldpathc;
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Char *bufnext, *bufend, *compilebuf, *qpatnext, patbuf[MAXPATHLEN+1];
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patnext = (u_char *) pattern;
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if (!(flags & GLOB_APPEND)) {
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pglob->gl_pathc = 0;
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pglob->gl_pathv = NULL;
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if (!(flags & GLOB_DOOFFS))
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pglob->gl_offs = 0;
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}
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pglob->gl_flags = flags & ~GLOB_MAGCHAR;
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pglob->gl_errfunc = errfunc;
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oldpathc = pglob->gl_pathc;
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pglob->gl_matchc = 0;
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bufnext = patbuf;
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bufend = bufnext + MAXPATHLEN;
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compilebuf = bufnext;
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compilepat = patnext;
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if (flags & GLOB_QUOTE) {
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/* Protect the quoted characters. */
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while (bufnext < bufend && (c = *patnext++) != EOS)
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if (c == QUOTE) {
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if ((c = *patnext++) == EOS) {
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c = QUOTE;
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--patnext;
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}
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*bufnext++ = c | M_PROTECT;
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}
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else
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*bufnext++ = c;
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}
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else
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while (bufnext < bufend && (c = *patnext++) != EOS)
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*bufnext++ = c;
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*bufnext = EOS;
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bufnext = patbuf;
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qpatnext = patbuf;
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/* We don't need to check for buffer overflow any more. */
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while ((c = *qpatnext++) != EOS) {
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switch (c) {
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case LBRACKET:
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pglob->gl_flags |= GLOB_MAGCHAR;
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c = *qpatnext;
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if (c == NOT)
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++qpatnext;
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if (*qpatnext == EOS ||
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g_strchr(qpatnext+1, RBRACKET) == NULL) {
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*bufnext++ = LBRACKET;
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if (c == NOT)
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--qpatnext;
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break;
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}
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*bufnext++ = M_SET;
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if (c == NOT)
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*bufnext++ = M_NOT;
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c = *qpatnext++;
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do {
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*bufnext++ = CHAR(c);
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if (*qpatnext == RANGE &&
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(c = qpatnext[1]) != RBRACKET) {
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*bufnext++ = M_RNG;
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*bufnext++ = CHAR(c);
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qpatnext += 2;
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}
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} while ((c = *qpatnext++) != RBRACKET);
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*bufnext++ = M_END;
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break;
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case QUESTION:
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pglob->gl_flags |= GLOB_MAGCHAR;
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*bufnext++ = M_ONE;
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break;
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case STAR:
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pglob->gl_flags |= GLOB_MAGCHAR;
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*bufnext++ = M_ALL;
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break;
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default:
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*bufnext++ = CHAR(c);
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break;
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}
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}
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*bufnext = EOS;
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#ifdef DEBUG
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qprintf(patbuf);
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#endif
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if ((err = glob1(patbuf, pglob)) != 0)
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return(err);
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if (pglob->gl_pathc == oldpathc && flags & GLOB_NOCHECK) {
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if (!(flags & GLOB_QUOTE)) {
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Char *dp = compilebuf;
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const u_char *sp = compilepat;
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while (*dp++ = *sp++);
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}
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else {
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/*
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* Copy pattern, interpreting quotes; this is slightly
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* different than the interpretation of quotes above
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* -- which should prevail?
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*/
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while (*compilepat != EOS) {
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if (*compilepat == QUOTE) {
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if (*++compilepat == EOS)
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--compilepat;
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}
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*compilebuf++ = (u_char)*compilepat++;
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}
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*compilebuf = EOS;
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}
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return(globextend(patbuf, pglob));
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} else if (!(flags & GLOB_NOSORT))
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qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
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pglob->gl_pathc - oldpathc, sizeof(char *), compare);
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return(0);
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}
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static int
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compare(p, q)
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const void *p, *q;
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{
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return(strcmp(*(char **)p, *(char **)q));
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}
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static
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glob1(pattern, pglob)
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Char *pattern;
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glob_t *pglob;
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{
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Char pathbuf[MAXPATHLEN+1];
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/* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
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if (*pattern == EOS)
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return(0);
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return(glob2(pathbuf, pathbuf, pattern, pglob));
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}
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/*
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* The functions glob2 and glob3 are mutually recursive; there is one level
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* of recursion for each segment in the pattern that contains one or more
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* meta characters.
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*/
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static
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glob2(pathbuf, pathend, pattern, pglob)
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Char *pathbuf, *pathend, *pattern;
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glob_t *pglob;
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{
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struct stat sb;
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Char *p, *q;
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int anymeta;
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/*
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* Loop over pattern segments until end of pattern or until
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* segment with meta character found.
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*/
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for (anymeta = 0;;) {
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if (*pattern == EOS) { /* End of pattern? */
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*pathend = EOS;
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if (g_stat(pathbuf, &sb))
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return(0);
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if (((pglob->gl_flags & GLOB_MARK) &&
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pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
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|| (S_ISLNK(sb.st_mode) &&
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(g_stat(pathbuf, &sb) == 0) &&
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S_ISDIR(sb.st_mode)))) {
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*pathend++ = SEP;
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*pathend = EOS;
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}
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++pglob->gl_matchc;
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return(globextend(pathbuf, pglob));
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}
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/* Find end of next segment, copy tentatively to pathend. */
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q = pathend;
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p = pattern;
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while (*p != EOS && *p != SEP) {
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if (ismeta(*p))
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anymeta = 1;
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*q++ = *p++;
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}
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if (!anymeta) { /* No expansion, do next segment. */
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pathend = q;
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pattern = p;
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while (*pattern == SEP)
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*pathend++ = *pattern++;
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} else /* Need expansion, recurse. */
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return(glob3(pathbuf, pathend, pattern, p, pglob));
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}
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/* NOTREACHED */
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}
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static
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glob3(pathbuf, pathend, pattern, restpattern, pglob)
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Char *pathbuf, *pathend, *pattern, *restpattern;
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glob_t *pglob;
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{
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register struct dirent *dp;
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DIR *dirp;
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int len, err;
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*pathend = EOS;
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errno = 0;
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if (!(dirp = g_opendir(pathbuf)))
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/* TODO: don't call for ENOENT or ENOTDIR? */
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if (pglob->gl_errfunc &&
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(*pglob->gl_errfunc)(pathbuf, errno) ||
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(pglob->gl_flags & GLOB_ERR))
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return(GLOB_ABEND);
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else
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return(0);
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err = 0;
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/* Search directory for matching names. */
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while ((dp = readdir(dirp))) {
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register u_char *sc;
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register Char *dc;
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/* Initial DOT must be matched literally. */
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if (dp->d_name[0] == DOT && *pattern != DOT)
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continue;
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for (sc = (u_char *) dp->d_name, dc = pathend;
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*dc++ = *sc++;);
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if (!match(pathend, pattern, restpattern)) {
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*pathend = EOS;
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continue;
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}
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err = glob2(pathbuf, --dc, restpattern, pglob);
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if (err)
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break;
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}
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/* TODO: check error from readdir? */
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(void)closedir(dirp);
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return(err);
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}
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/*
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* Extend the gl_pathv member of a glob_t structure to accomodate a new item,
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* add the new item, and update gl_pathc.
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*
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* This assumes the BSD realloc, which only copies the block when its size
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* crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
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* behavior.
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*
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* Return 0 if new item added, error code if memory couldn't be allocated.
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*
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* Invariant of the glob_t structure:
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* Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
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* gl_pathv points to (gl_offs + gl_pathc + 1) items.
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*/
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static int
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globextend(path, pglob)
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Char *path;
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glob_t *pglob;
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{
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register char **pathv;
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register int i;
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u_int newsize;
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char *copy;
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Char *p;
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newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
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pathv = (char **)realloc((char *)pglob->gl_pathv, newsize);
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if (pathv == NULL)
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return(GLOB_NOSPACE);
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if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
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/* first time around -- clear initial gl_offs items */
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pathv += pglob->gl_offs;
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for (i = pglob->gl_offs; --i >= 0; )
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*--pathv = NULL;
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}
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pglob->gl_pathv = pathv;
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for (p = path; *p++;);
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if ((copy = malloc(p - path)) != NULL) {
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g_Ctoc(path, copy);
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pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
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}
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pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
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return(copy == NULL ? GLOB_NOSPACE : 0);
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}
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/*
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* pattern matching function for filenames. Each occurrence of the *
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* pattern causes a recursion level.
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*/
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static
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match(name, pat, patend)
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register Char *name, *pat, *patend;
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{
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int ok, negate_range;
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Char c, k;
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while (pat < patend) {
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c = *pat++;
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switch (c & M_MASK) {
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case M_ALL:
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if (pat == patend)
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return(1);
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for (; *name != EOS; ++name)
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if (match(name, pat, patend))
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return(1);
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return(0);
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case M_ONE:
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if (*name++ == EOS)
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return(0);
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break;
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case M_SET:
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ok = 0;
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k = *name++;
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if (negate_range = ((*pat & M_MASK) == M_NOT))
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++pat;
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while (((c = *pat++) & M_MASK) != M_END)
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if ((*pat & M_MASK) == M_RNG) {
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if (c <= k && k <= pat[1])
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ok = 1;
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pat += 2;
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} else if (c == k)
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ok = 1;
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if (ok == negate_range)
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return(0);
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break;
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default:
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if (*name++ != c)
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return(0);
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break;
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}
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}
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return(*name == EOS);
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}
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/* Free allocated data belonging to a glob_t structure. */
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void
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globfree(pglob)
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glob_t *pglob;
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{
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register int i;
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register char **pp;
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if (pglob->gl_pathv != NULL) {
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pp = pglob->gl_pathv + pglob->gl_offs;
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for (i = pglob->gl_pathc; i--; ++pp)
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if (*pp)
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free(*pp);
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free(pglob->gl_pathv);
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}
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}
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static DIR *
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g_opendir(str)
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register Char *str;
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{
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char buf[MAXPATHLEN];
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if (!*str)
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return(opendir("."));
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g_Ctoc(str, buf);
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return(opendir(buf));
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}
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static int
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g_lstat(fn, sb)
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register Char *fn;
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struct stat *sb;
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{
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char buf[MAXPATHLEN];
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g_Ctoc(fn, buf);
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return(lstat(buf, sb));
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}
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static int
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g_stat(fn, sb)
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register Char *fn;
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struct stat *sb;
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{
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char buf[MAXPATHLEN];
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g_Ctoc(fn, buf);
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return(stat(buf, sb));
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}
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static Char *
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g_strchr(str, ch)
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Char *str;
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int ch;
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{
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do {
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if (*str == ch)
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return (str);
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} while (*str++);
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return (NULL);
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}
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static void
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g_Ctoc(str, buf)
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register Char *str;
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char *buf;
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{
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register char *dc;
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for (dc = buf; *dc++ = *str++;);
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}
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#ifdef DEBUG
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static void
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qprintf(s)
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register Char *s;
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{
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register Char *p;
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for (p = s; *p; p++)
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(void)printf("%c", *p & 0xff);
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(void)printf("\n");
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for (p = s; *p; p++)
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(void)printf("%c", *p & M_PROTECT ? '"' : ' ');
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(void)printf("\n");
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for (p = s; *p; p++)
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(void)printf("%c", *p & M_META ? '_' : ' ');
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(void)printf("\n");
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}
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#endif
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