bsd_glob.c

Altera recommends the following system configuration: * Pentium II 400 with 512-MB system memory (fa

/*
 * 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. 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	8.3 (Berkeley) 10/13/93";
#endif /* LIBC_SCCS and not lint */

/*
 * 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.
 * GLOB_ALPHASORT:
 *	sort alphabetically like csh (case doesn't matter) instead of in ASCII
 *	order
 */

#include <EXTERN.h>
#include <perl.h>
#include <XSUB.h>

#include "bsd_glob.h"
#ifdef I_PWD
#	include <pwd.h>
#else
#ifdef HAS_PASSWD
	struct passwd *getpwnam(char *);
	struct passwd *getpwuid(Uid_t);
#endif
#endif

#ifndef MAXPATHLEN
#  ifdef PATH_MAX
#    define	MAXPATHLEN	PATH_MAX
#    ifdef MACOS_TRADITIONAL
#      define	MAXPATHLEN	255
#    else
#      define	MAXPATHLEN	1024
#    endif
#  endif
#endif

#define	BG_DOLLAR	'$'
#define	BG_DOT		'.'
#define	BG_EOS		'\0'
#define	BG_LBRACKET	'['
#define	BG_NOT		'!'
#define	BG_QUESTION	'?'
#define	BG_QUOTE	'\\'
#define	BG_RANGE	'-'
#define	BG_RBRACKET	']'
#ifdef MACOS_TRADITIONAL
#  define	BG_SEP	':'
#else
#  define	BG_SEP	'/'
#endif
#ifdef DOSISH
#define BG_SEP2		'\\'
#endif
#define	BG_STAR		'*'
#define	BG_TILDE	'~'
#define	BG_UNDERSCORE	'_'
#define	BG_LBRACE	'{'
#define	BG_RBRACE	'}'
#define	BG_SLASH	'/'
#define	BG_COMMA	','

#ifndef GLOB_DEBUG

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

typedef U16 Char;

#else

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

typedef U8 Char;

#endif /* !GLOB_DEBUG */


#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	 ci_compare(const void *, const void *);
static void	 g_Ctoc(const Char *, char *);
static int	 g_lstat(Char *, Stat_t *, 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 *, Stat_t *, glob_t *);
static int	 glob0(const Char *, glob_t *);
static int	 glob1(Char *, glob_t *);
static int	 glob2(Char *, Char *, Char *, glob_t *);
static int	 glob3(Char *, Char *, Char *, Char *, glob_t *);
static int	 globextend(const Char *, glob_t *);
static const Char *	 globtilde(const Char *, Char *, glob_t *);
static int	 globexp1(const Char *, glob_t *);
static int	 globexp2(const Char *, const Char *, glob_t *, int *);
static int	 match(Char *, Char *, Char *, int);
#ifdef GLOB_DEBUG
static void	 qprintf(const char *, Char *);
#endif /* GLOB_DEBUG */

#ifdef PERL_IMPLICIT_CONTEXT
static Direntry_t *	my_readdir(DIR*);

static Direntry_t *
my_readdir(DIR *d)
{
    return PerlDir_read(d);
}
#else
#define	my_readdir	readdir
#endif

int
bsd_glob(const char *pattern, int flags,
	 int (*errfunc)(const char *, int), glob_t *pglob)
{
	const U8 *patnext;
	int c;
	Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];

	patnext = (U8 *) 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;
	pglob->gl_matchc = 0;

	bufnext = patbuf;
	bufend = bufnext + MAXPATHLEN;
#ifdef DOSISH
	/* Nasty hack to treat patterns like "C:*" correctly. In this
	 * case, the * should match any file in the current directory
	 * on the C: drive. However, the glob code does not treat the
	 * colon specially, so it looks for files beginning "C:" in
	 * the current directory. To fix this, change the pattern to
	 * add an explicit "./" at the start (just after the drive
	 * letter and colon - ie change to "C:./*").
	 */
	if (isalpha(pattern[0]) && pattern[1] == ':' &&
	    pattern[2] != BG_SEP && pattern[2] != BG_SEP2 &&
	    bufend - bufnext > 4) {
		*bufnext++ = pattern[0];
		*bufnext++ = ':';
		*bufnext++ = '.';
		*bufnext++ = BG_SEP;
		patnext += 2;
	}
#endif
	if (flags & GLOB_QUOTE) {
		/* Protect the quoted characters. */
		while (bufnext < bufend && (c = *patnext++) != BG_EOS)
			if (c == BG_QUOTE) {
#ifdef DOSISH
				    /* To avoid backslashitis on Win32,
				     * we only treat \ as a quoting character
				     * if it precedes one of the
				     * metacharacters []-{}~\
				     */
				if ((c = *patnext++) != '[' && c != ']' &&
				    c != '-' && c != '{' && c != '}' &&
				    c != '~' && c != '\\') {
#else
				if ((c = *patnext++) == BG_EOS) {
#endif
					c = BG_QUOTE;
					--patnext;
				}
				*bufnext++ = c | M_PROTECT;
			}
			else
				*bufnext++ = c;
	}
	else
	    while (bufnext < bufend && (c = *patnext++) != BG_EOS)
		    *bufnext++ = c;
	*bufnext = BG_EOS;

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

/*
 * 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)
{
	const Char* ptr = pattern;
	int rv;

	/* Protect a single {}, for find(1), like csh */
	if (pattern[0] == BG_LBRACE && pattern[1] == BG_RBRACE && pattern[2] == BG_EOS)
		return glob0(pattern, pglob);

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

	return glob0(pattern, pglob);
}


/*
 * 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     i;
	Char   *lm, *ls;
	const Char *pe, *pm, *pl;
	Char    patbuf[MAXPATHLEN + 1];

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

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

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

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

		case BG_LBRACE:
			i++;
			break;

		case BG_RBRACE:
			if (i) {
			    i--;
			    break;
			}
			/* FALLTHROUGH */
		case BG_COMMA:
			if (i && *pm == BG_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++) != BG_EOS;)
					continue;

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

				/* 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, glob_t *pglob)
{
	struct passwd *pwd;
	char *h;
	const Char *p;
	Char *b;

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

	/* Copy up to the end of the string or / */
	for (p = pattern + 1, h = (char *) patbuf; *p && *p != BG_SLASH;
	     *h++ = *p++)
		continue;

	*h = BG_EOS;

	if (((char *) patbuf)[0] == BG_EOS) {
		/*
		 * handle a plain ~ or ~/ by expanding $HOME
		 * first and then trying the password file
		 */
		if ((h = getenv("HOME")) == NULL) {
#ifdef HAS_PASSWD
			if ((pwd = getpwuid(getuid())) == NULL)
				return pattern;
			else
				h = pwd->pw_dir;
#else
                        return pattern;
#endif
		}
	}
	else {
		/*
		 * Expand a ~user
		 */
#ifdef HAS_PASSWD
		if ((pwd = getpwnam((char*) patbuf)) == NULL)
			return pattern;
		else
			h = pwd->pw_dir;
#else
                return pattern;
#endif
	}

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

	/* Append the rest of the pattern */
	while ((*b++ = *p++) != BG_EOS)
		continue;

	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(const Char *pattern, glob_t *pglob)
{
	const Char *qpat, *qpatnext;
	int c, err, oldflags, oldpathc;
	Char *bufnext, patbuf[MAXPATHLEN+1];

#ifdef MACOS_TRADITIONAL
	if ( (*pattern == BG_TILDE) && (pglob->gl_flags & GLOB_TILDE) ) {
		return(globextend(pattern, pglob));
	}
#endif

	qpat = globtilde(pattern, patbuf, pglob);
	qpatnext = qpat;
	oldflags = pglob->gl_flags;
	oldpathc = pglob->gl_pathc;
	bufnext = patbuf;

	/* We don't need to check for buffer overflow any more. */
	while ((c = *qpatnext++) != BG_EOS) {
		switch (c) {
		case BG_LBRACKET:
			c = *qpatnext;
			if (c == BG_NOT)
				++qpatnext;
			if (*qpatnext == BG_EOS ||
			    g_strchr((Char *) qpatnext+1, BG_RBRACKET) == NULL) {
				*bufnext++ = BG_LBRACKET;
				if (c == BG_NOT)
					--qpatnext;
				break;
			}