[p5sagit/p5-mst-13.2.git] / ext / Cwd / Cwd.xs

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#define NEED_sv_2pv_nolen
#include "ppport.h"

#ifdef I_UNISTD
#   include <unistd.h>
#endif

/* The realpath() implementation from OpenBSD 2.9 (realpath.c 1.4)
 * Renamed here to bsd_realpath() to avoid library conflicts.
 * --jhi 2000-06-20 
 */

/* See
 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2004-11/msg00979.html
 * for the details of why the BSD license is compatible with the
 * AL/GPL standard perl license.
 */

/*
 * Copyright (c) 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry.
 *
 * 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 *rcsid = "$OpenBSD: realpath.c,v 1.4 1998/05/18 09:55:19 deraadt Exp $";
#endif /* LIBC_SCCS and not lint */

/* OpenBSD system #includes removed since the Perl ones should do. --jhi */

#ifndef MAXSYMLINKS
#define MAXSYMLINKS 8
#endif

/*
 * char *realpath(const char *path, char resolved_path[MAXPATHLEN]);
 *
 * Find the real name of path, by removing all ".", ".." and symlink
 * components.  Returns (resolved) on success, or (NULL) on failure,
 * in which case the path which caused trouble is left in (resolved).
 */
static
char *
bsd_realpath(path, resolved)
	const char *path;
	char *resolved;
{
#ifdef VMS
       dTHX;
       return Perl_rmsexpand(aTHX_ (char*)path, resolved, NULL, 0);
#else
	int rootd, serrno;
	char *p, *q, wbuf[MAXPATHLEN];
	int symlinks = 0;

	/* Save the starting point. */
#ifdef HAS_FCHDIR
	int fd;

	if ((fd = open(".", O_RDONLY)) < 0) {
		(void)strcpy(resolved, ".");
		return (NULL);
	}
#else
	char wd[MAXPATHLEN];

	if (getcwd(wd, MAXPATHLEN - 1) == NULL) {
		(void)strcpy(resolved, ".");
		return (NULL);
	}
#endif

	/*
	 * Find the dirname and basename from the path to be resolved.
	 * Change directory to the dirname component.
	 * lstat the basename part.
	 *     if it is a symlink, read in the value and loop.
	 *     if it is a directory, then change to that directory.
	 * get the current directory name and append the basename.
	 */
	(void)strncpy(resolved, path, MAXPATHLEN - 1);
	resolved[MAXPATHLEN - 1] = '\0';
loop:
	q = strrchr(resolved, '/');
	if (q != NULL) {
		p = q + 1;
		if (q == resolved)
			q = "/";
		else {
			do {
				--q;
			} while (q > resolved && *q == '/');
			q[1] = '\0';
			q = resolved;
		}
		if (chdir(q) < 0)
			goto err1;
	} else
		p = resolved;

#if defined(HAS_LSTAT) && defined(HAS_READLINK) && defined(HAS_SYMLINK)
    {
	struct stat sb;
	/* Deal with the last component. */
	if (lstat(p, &sb) == 0) {
		if (S_ISLNK(sb.st_mode)) {
			int n;
			if (++symlinks > MAXSYMLINKS) {
				errno = ELOOP;
				goto err1;
			}
			n = readlink(p, resolved, MAXPATHLEN-1);
			if (n < 0)
				goto err1;
			resolved[n] = '\0';
			goto loop;
		}
		if (S_ISDIR(sb.st_mode)) {
			if (chdir(p) < 0)
				goto err1;
			p = "";
		}
	}
    }
#endif

	/*
	 * Save the last component name and get the full pathname of
	 * the current directory.
	 */
	(void)strcpy(wbuf, p);
	if (getcwd(resolved, MAXPATHLEN) == 0)
		goto err1;

	/*
	 * Join the two strings together, ensuring that the right thing
	 * happens if the last component is empty, or the dirname is root.
	 */
	if (resolved[0] == '/' && resolved[1] == '\0')
		rootd = 1;
	else
		rootd = 0;

	if (*wbuf) {
		if (strlen(resolved) + strlen(wbuf) + (1 - rootd) + 1 > MAXPATHLEN) {
			errno = ENAMETOOLONG;
			goto err1;
		}
		if (rootd == 0)
			(void)strcat(resolved, "/");
		(void)strcat(resolved, wbuf);
	}

	/* Go back to where we came from. */
#ifdef HAS_FCHDIR
	if (fchdir(fd) < 0) {
		serrno = errno;
		goto err2;
	}
#else
	if (chdir(wd) < 0) {
		serrno = errno;
		goto err2;
	}
#endif

	/* It's okay if the close fails, what's an fd more or less? */
#ifdef HAS_FCHDIR
	(void)close(fd);
#endif
	return (resolved);

err1:	serrno = errno;
#ifdef HAS_FCHDIR
	(void)fchdir(fd);
#else
	(void)chdir(wd);
#endif

err2:
#ifdef HAS_FCHDIR
	(void)close(fd);
#endif
	errno = serrno;
	return (NULL);
#endif
}

#ifndef SV_CWD_RETURN_UNDEF
#define SV_CWD_RETURN_UNDEF \
sv_setsv(sv, &PL_sv_undef); \
return FALSE
#endif

#ifndef OPpENTERSUB_HASTARG
#define OPpENTERSUB_HASTARG     32      /* Called from OP tree. */
#endif

#ifndef dXSTARG
#define dXSTARG SV * targ = ((PL_op->op_private & OPpENTERSUB_HASTARG) \
                             ? PAD_SV(PL_op->op_targ) : sv_newmortal())
#endif

#ifndef XSprePUSH
#define XSprePUSH (sp = PL_stack_base + ax - 1)
#endif

#ifndef SV_CWD_ISDOT
#define SV_CWD_ISDOT(dp) \
    (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || \
        (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
#endif

#ifndef getcwd_sv
/* Taken from perl 5.8's util.c */
#define getcwd_sv(a) Perl_getcwd_sv(aTHX_ a)
int Perl_getcwd_sv(pTHX_ register SV *sv)
{
#ifndef PERL_MICRO

#ifndef INCOMPLETE_TAINTS
    SvTAINTED_on(sv);
#endif

#ifdef HAS_GETCWD
    {
	char buf[MAXPATHLEN];

	/* Some getcwd()s automatically allocate a buffer of the given
	 * size from the heap if they are given a NULL buffer pointer.
	 * The problem is that this behaviour is not portable. */
	if (getcwd(buf, sizeof(buf) - 1)) {
	    STRLEN len = strlen(buf);
	    sv_setpvn(sv, buf, len);
	    return TRUE;
	}
	else {
	    sv_setsv(sv, &PL_sv_undef);
	    return FALSE;
	}
    }

#else

    Stat_t statbuf;
    int orig_cdev, orig_cino, cdev, cino, odev, oino, tdev, tino;
    int namelen, pathlen=0;
    DIR *dir;
    Direntry_t *dp;

    (void)SvUPGRADE(sv, SVt_PV);

    if (PerlLIO_lstat(".", &statbuf) < 0) {
	SV_CWD_RETURN_UNDEF;
    }

    orig_cdev = statbuf.st_dev;
    orig_cino = statbuf.st_ino;
    cdev = orig_cdev;
    cino = orig_cino;

    for (;;) {
	odev = cdev;
	oino = cino;

	if (PerlDir_chdir("..") < 0) {
	    SV_CWD_RETURN_UNDEF;
	}
	if (PerlLIO_stat(".", &statbuf) < 0) {
	    SV_CWD_RETURN_UNDEF;
	}

	cdev = statbuf.st_dev;
	cino = statbuf.st_ino;

	if (odev == cdev && oino == cino) {
	    break;
	}
	if (!(dir = PerlDir_open("."))) {
	    SV_CWD_RETURN_UNDEF;
	}

	while ((dp = PerlDir_read(dir)) != NULL) {
#ifdef DIRNAMLEN
	    namelen = dp->d_namlen;
#else
	    namelen = strlen(dp->d_name);
#endif
	    /* skip . and .. */
	    if (SV_CWD_ISDOT(dp)) {
		continue;
	    }

	    if (PerlLIO_lstat(dp->d_name, &statbuf) < 0) {
		SV_CWD_RETURN_UNDEF;
	    }

	    tdev = statbuf.st_dev;
	    tino = statbuf.st_ino;
	    if (tino == oino && tdev == odev) {
		break;
	    }
	}

	if (!dp) {
	    SV_CWD_RETURN_UNDEF;
	}

	if (pathlen + namelen + 1 >= MAXPATHLEN) {
	    SV_CWD_RETURN_UNDEF;
	}

	SvGROW(sv, pathlen + namelen + 1);

	if (pathlen) {
	    /* shift down */
	    Move(SvPVX(sv), SvPVX(sv) + namelen + 1, pathlen, char);
	}

	/* prepend current directory to the front */
	*SvPVX(sv) = '/';
	Move(dp->d_name, SvPVX(sv)+1, namelen, char);
	pathlen += (namelen + 1);

#ifdef VOID_CLOSEDIR
	PerlDir_close(dir);
#else
	if (PerlDir_close(dir) < 0) {
	    SV_CWD_RETURN_UNDEF;
	}
#endif
    }

    if (pathlen) {
	SvCUR_set(sv, pathlen);
	*SvEND(sv) = '\0';
	SvPOK_only(sv);

	if (PerlDir_chdir(SvPVX(sv)) < 0) {
	    SV_CWD_RETURN_UNDEF;
	}
    }
    if (PerlLIO_stat(".", &statbuf) < 0) {
	SV_CWD_RETURN_UNDEF;
    }

    cdev = statbuf.st_dev;
    cino = statbuf.st_ino;

    if (cdev != orig_cdev || cino != orig_cino) {
	Perl_croak(aTHX_ "Unstable directory path, "
		   "current directory changed unexpectedly");
    }

    return TRUE;
#endif

#else
    return FALSE;
#endif
}

#endif


MODULE = Cwd		PACKAGE = Cwd

PROTOTYPES: ENABLE

void
fastcwd()
PROTOTYPE: DISABLE
PPCODE:
{
    dXSTARG;
    getcwd_sv(TARG);
    XSprePUSH; PUSHTARG;
#ifndef INCOMPLETE_TAINTS
    SvTAINTED_on(TARG);
#endif
}

void
abs_path(pathsv=Nullsv)
    SV *pathsv
PROTOTYPE: DISABLE
PPCODE:
{
    dXSTARG;
    char *path;
    char buf[MAXPATHLEN];

    path = pathsv ? SvPV_nolen(pathsv) : ".";

    if (bsd_realpath(path, buf)) {
        sv_setpvn(TARG, buf, strlen(buf));
        SvPOK_only(TARG);
	SvTAINTED_on(TARG);
    }
    else
        sv_setsv(TARG, &PL_sv_undef);

    XSprePUSH; PUSHTARG;
#ifndef INCOMPLETE_TAINTS
    SvTAINTED_on(TARG);
#endif
}

#ifdef WIN32

void
getdcwd(...)
PPCODE:
{
    dXSTARG;
    int drive;
    char *dir;

    /* Drive 0 is the current drive, 1 is A:, 2 is B:, 3 is C: and so on. */
    if ( items == 0 ||
        (items == 1 && (!SvOK(ST(0)) || (SvPOK(ST(0)) && !SvCUR(ST(0))))))
        drive = 0;
    else if (items == 1 && SvPOK(ST(0)) && SvCUR(ST(0)) &&
             isALPHA(SvPVX(ST(0))[0]))
        drive = toUPPER(SvPVX(ST(0))[0]) - 'A' + 1;
    else
        croak("Usage: getdcwd(DRIVE)");

    New(0,dir,MAXPATHLEN,char);
    if (_getdcwd(drive, dir, MAXPATHLEN)) {
        sv_setpvn(TARG, dir, strlen(dir));
        SvPOK_only(TARG);
    }
    else
        sv_setsv(TARG, &PL_sv_undef);

    Safefree(dir);

    XSprePUSH; PUSHTARG;
#ifndef INCOMPLETE_TAINTS
    SvTAINTED_on(TARG);
#endif
}

#endif
Commit	Line	Data
0d2079fa	1	#include "EXTERN.h"
	2	#include "perl.h"
	3	#include "XSUB.h"
99f36a73	4	#define NEED_sv_2pv_nolen
99f36a73	5	#include "ppport.h"
0d2079fa	6
c70498c1	7	#ifdef I_UNISTD
	8	# include <unistd.h>
	9	#endif
	10
03d70c89	11	/* The realpath() implementation from OpenBSD 2.9 (realpath.c 1.4)
03d70c89	12	* Renamed here to bsd_realpath() to avoid library conflicts.
99f36a73	13	* --jhi 2000-06-20
	14	*/
	15
	16	/* See
	17	* http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2004-11/msg00979.html
	18	* for the details of why the BSD license is compatible with the
	19	* AL/GPL standard perl license.
	20	*/
03d70c89	21
	22	/*
	23	* Copyright (c) 1994
	24	* The Regents of the University of California. All rights reserved.
	25	*
	26	* This code is derived from software contributed to Berkeley by
	27	* Jan-Simon Pendry.
	28	*
	29	* Redistribution and use in source and binary forms, with or without
	30	* modification, are permitted provided that the following conditions
	31	* are met:
	32	* 1. Redistributions of source code must retain the above copyright
	33	* notice, this list of conditions and the following disclaimer.
	34	* 2. Redistributions in binary form must reproduce the above copyright
	35	* notice, this list of conditions and the following disclaimer in the
	36	* documentation and/or other materials provided with the distribution.
99f36a73	37	* 3. Neither the name of the University nor the names of its contributors
03d70c89	38	* may be used to endorse or promote products derived from this software
	39	* without specific prior written permission.
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*/
	53
	54	#if defined(LIBC_SCCS) && !defined(lint)
	55	static char *rcsid = "$OpenBSD: realpath.c,v 1.4 1998/05/18 09:55:19 deraadt Exp $";
	56	#endif /* LIBC_SCCS and not lint */
	57
	58	/* OpenBSD system #includes removed since the Perl ones should do. --jhi */
	59
	60	#ifndef MAXSYMLINKS
	61	#define MAXSYMLINKS 8
	62	#endif
	63
	64	/*
	65	* char realpath(const char path, char resolved_path[MAXPATHLEN]);
	66	*
	67	* Find the real name of path, by removing all ".", ".." and symlink
	68	* components. Returns (resolved) on success, or (NULL) on failure,
	69	* in which case the path which caused trouble is left in (resolved).
	70	*/
	71	static
	72	char *
	73	bsd_realpath(path, resolved)
	74	const char *path;
	75	char *resolved;
	76	{
e3d944f4	77	#ifdef VMS
32af7c23	78	dTHX;
32af7c23	79	return Perl_rmsexpand(aTHX_ (char*)path, resolved, NULL, 0);
e3d944f4	80	#else
91f3b821	81	int rootd, serrno;
03d70c89	82	char p, q, wbuf[MAXPATHLEN];
	83	int symlinks = 0;
	84
	85	/* Save the starting point. */
e3d944f4	86	#ifdef HAS_FCHDIR
bae06e14	87	int fd;
bae06e14	88
03d70c89	89	if ((fd = open(".", O_RDONLY)) < 0) {
	90	(void)strcpy(resolved, ".");
	91	return (NULL);
	92	}
e3d944f4	93	#else
	94	char wd[MAXPATHLEN];
	95
	96	if (getcwd(wd, MAXPATHLEN - 1) == NULL) {
	97	(void)strcpy(resolved, ".");
	98	return (NULL);
	99	}
	100	#endif
03d70c89	101
	102	/*
	103	* Find the dirname and basename from the path to be resolved.
	104	* Change directory to the dirname component.
	105	* lstat the basename part.
	106	* if it is a symlink, read in the value and loop.
	107	* if it is a directory, then change to that directory.
	108	* get the current directory name and append the basename.
	109	*/
	110	(void)strncpy(resolved, path, MAXPATHLEN - 1);
	111	resolved[MAXPATHLEN - 1] = '\0';
	112	loop:
	113	q = strrchr(resolved, '/');
	114	if (q != NULL) {
	115	p = q + 1;
	116	if (q == resolved)
	117	q = "/";
	118	else {
	119	do {
	120	--q;
	121	} while (q > resolved && *q == '/');
	122	q[1] = '\0';
	123	q = resolved;
	124	}
	125	if (chdir(q) < 0)
	126	goto err1;
	127	} else
	128	p = resolved;
	129
bae06e14	130	#if defined(HAS_LSTAT) && defined(HAS_READLINK) && defined(HAS_SYMLINK)
91f3b821	131	{
91f3b821	132	struct stat sb;
03d70c89	133	/* Deal with the last component. */
	134	if (lstat(p, &sb) == 0) {
	135	if (S_ISLNK(sb.st_mode)) {
91f3b821	136	int n;
03d70c89	137	if (++symlinks > MAXSYMLINKS) {
	138	errno = ELOOP;
	139	goto err1;
	140	}
	141	n = readlink(p, resolved, MAXPATHLEN-1);
	142	if (n < 0)
	143	goto err1;
	144	resolved[n] = '\0';
	145	goto loop;
	146	}
	147	if (S_ISDIR(sb.st_mode)) {
	148	if (chdir(p) < 0)
	149	goto err1;
	150	p = "";
	151	}
	152	}
91f3b821	153	}
e3d944f4	154	#endif
03d70c89	155
	156	/*
	157	* Save the last component name and get the full pathname of
	158	* the current directory.
	159	*/
	160	(void)strcpy(wbuf, p);
	161	if (getcwd(resolved, MAXPATHLEN) == 0)
	162	goto err1;
	163
	164	/*
	165	* Join the two strings together, ensuring that the right thing
	166	* happens if the last component is empty, or the dirname is root.
	167	*/
	168	if (resolved[0] == '/' && resolved[1] == '\0')
	169	rootd = 1;
	170	else
	171	rootd = 0;
	172
	173	if (*wbuf) {
7f6e23a8	174	if (strlen(resolved) + strlen(wbuf) + (1 - rootd) + 1 > MAXPATHLEN) {
03d70c89	175	errno = ENAMETOOLONG;
	176	goto err1;
	177	}
	178	if (rootd == 0)
	179	(void)strcat(resolved, "/");
	180	(void)strcat(resolved, wbuf);
	181	}
	182
	183	/* Go back to where we came from. */
e3d944f4	184	#ifdef HAS_FCHDIR
03d70c89	185	if (fchdir(fd) < 0) {
	186	serrno = errno;
	187	goto err2;
	188	}
e3d944f4	189	#else
	190	if (chdir(wd) < 0) {
	191	serrno = errno;
	192	goto err2;
	193	}
	194	#endif
03d70c89	195
03d70c89	196	/* It's okay if the close fails, what's an fd more or less? */
9cad6237	197	#ifdef HAS_FCHDIR
03d70c89	198	(void)close(fd);
9cad6237	199	#endif
03d70c89	200	return (resolved);
	201
	202	err1: serrno = errno;
29ab7413	203	#ifdef HAS_FCHDIR
03d70c89	204	(void)fchdir(fd);
29ab7413	205	#else
	206	(void)chdir(wd);
	207	#endif
89423764	208
	209	err2:
	210	#ifdef HAS_FCHDIR
	211	(void)close(fd);
	212	#endif
03d70c89	213	errno = serrno;
03d70c89	214	return (NULL);
e3d944f4	215	#endif
03d70c89	216	}
03d70c89	217
99f36a73	218	#ifndef SV_CWD_RETURN_UNDEF
	219	#define SV_CWD_RETURN_UNDEF \
	220	sv_setsv(sv, &PL_sv_undef); \
	221	return FALSE
	222	#endif
	223
	224	#ifndef OPpENTERSUB_HASTARG
	225	#define OPpENTERSUB_HASTARG 32 /* Called from OP tree. */
	226	#endif
	227
	228	#ifndef dXSTARG
	229	#define dXSTARG SV * targ = ((PL_op->op_private & OPpENTERSUB_HASTARG) \
	230	? PAD_SV(PL_op->op_targ) : sv_newmortal())
	231	#endif
	232
	233	#ifndef XSprePUSH
	234	#define XSprePUSH (sp = PL_stack_base + ax - 1)
	235	#endif
	236
	237	#ifndef SV_CWD_ISDOT
	238	#define SV_CWD_ISDOT(dp) \
	239	(dp->d_name[0] == '.' && (dp->d_name[1] == '\0' \|\| \
	240	(dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
	241	#endif
	242
a9939470	243	#ifndef getcwd_sv
1955c8df	244	/* Taken from perl 5.8's util.c */
09122b95	245	#define getcwd_sv(a) Perl_getcwd_sv(aTHX_ a)
09122b95	246	int Perl_getcwd_sv(pTHX_ register SV *sv)
a9939470	247	{
	248	#ifndef PERL_MICRO
	249
	250	#ifndef INCOMPLETE_TAINTS
	251	SvTAINTED_on(sv);
	252	#endif
	253
	254	#ifdef HAS_GETCWD
	255	{
	256	char buf[MAXPATHLEN];
	257
	258	/* Some getcwd()s automatically allocate a buffer of the given
	259	* size from the heap if they are given a NULL buffer pointer.
	260	* The problem is that this behaviour is not portable. */
	261	if (getcwd(buf, sizeof(buf) - 1)) {
	262	STRLEN len = strlen(buf);
	263	sv_setpvn(sv, buf, len);
	264	return TRUE;
	265	}
	266	else {
	267	sv_setsv(sv, &PL_sv_undef);
	268	return FALSE;
	269	}
	270	}
	271
	272	#else
	273
	274	Stat_t statbuf;
	275	int orig_cdev, orig_cino, cdev, cino, odev, oino, tdev, tino;
	276	int namelen, pathlen=0;
	277	DIR *dir;
	278	Direntry_t *dp;
	279
	280	(void)SvUPGRADE(sv, SVt_PV);
	281
	282	if (PerlLIO_lstat(".", &statbuf) < 0) {
	283	SV_CWD_RETURN_UNDEF;
	284	}
	285
	286	orig_cdev = statbuf.st_dev;
	287	orig_cino = statbuf.st_ino;
	288	cdev = orig_cdev;
	289	cino = orig_cino;
	290
	291	for (;;) {
	292	odev = cdev;
	293	oino = cino;
	294
	295	if (PerlDir_chdir("..") < 0) {
	296	SV_CWD_RETURN_UNDEF;
	297	}
	298	if (PerlLIO_stat(".", &statbuf) < 0) {
	299	SV_CWD_RETURN_UNDEF;
	300	}
	301
	302	cdev = statbuf.st_dev;
	303	cino = statbuf.st_ino;
	304
	305	if (odev == cdev && oino == cino) {
	306	break;
	307	}
	308	if (!(dir = PerlDir_open("."))) {
	309	SV_CWD_RETURN_UNDEF;
	310	}
311
312	while ((dp = PerlDir_read(dir)) != NULL) {
313	#ifdef DIRNAMLEN
314	namelen = dp->d_namlen;
315	#else
316	namelen = strlen(dp->d_name);
317	#endif
318	/* skip . and .. */
319	if (SV_CWD_ISDOT(dp)) {
320	continue;
321	}
322
323	if (PerlLIO_lstat(dp->d_name, &statbuf) < 0) {
324	SV_CWD_RETURN_UNDEF;
325	}
326
327	tdev = statbuf.st_dev;
328	tino = statbuf.st_ino;
329	if (tino == oino && tdev == odev) {
330	break;
331	}
332	}
333
334	if (!dp) {
335	SV_CWD_RETURN_UNDEF;
336	}
337
338	if (pathlen + namelen + 1 >= MAXPATHLEN) {
339	SV_CWD_RETURN_UNDEF;
340	}
341
342	SvGROW(sv, pathlen + namelen + 1);
343
344	if (pathlen) {
345	/* shift down */
346	Move(SvPVX(sv), SvPVX(sv) + namelen + 1, pathlen, char);
347	}
348
349	/* prepend current directory to the front */
350	*SvPVX(sv) = '/';
351	Move(dp->d_name, SvPVX(sv)+1, namelen, char);
352	pathlen += (namelen + 1);
353
354	#ifdef VOID_CLOSEDIR
355	PerlDir_close(dir);
356	#else
357	if (PerlDir_close(dir) < 0) {
358	SV_CWD_RETURN_UNDEF;
359	}
360	#endif
361	}
362
363	if (pathlen) {
364	SvCUR_set(sv, pathlen);
365	*SvEND(sv) = '\0';
366	SvPOK_only(sv);
367
368	if (PerlDir_chdir(SvPVX(sv)) < 0) {
369	SV_CWD_RETURN_UNDEF;
370	}
371	}
372	if (PerlLIO_stat(".", &statbuf) < 0) {
373	SV_CWD_RETURN_UNDEF;
374	}
375
376	cdev = statbuf.st_dev;
377	cino = statbuf.st_ino;
378
379	if (cdev != orig_cdev \|\| cino != orig_cino) {
380	Perl_croak(aTHX_ "Unstable directory path, "
381	"current directory changed unexpectedly");
382	}
383
384	return TRUE;
385	#endif
386
387	#else
388	return FALSE;
389	#endif
390	}
391
392	#endif
393
394
f22d8e4b	395	MODULE = Cwd PACKAGE = Cwd
0d2079fa	396
f22d8e4b	397	PROTOTYPES: ENABLE
0d2079fa	398
f22d8e4b	399	void
f22d8e4b	400	fastcwd()
7ddb28a3	401	PROTOTYPE: DISABLE
f22d8e4b	402	PPCODE:
	403	{
	404	dXSTARG;
89423764	405	getcwd_sv(TARG);
f22d8e4b	406	XSprePUSH; PUSHTARG;
248785eb	407	#ifndef INCOMPLETE_TAINTS
	408	SvTAINTED_on(TARG);
	409	#endif
0d2079fa	410	}
0d2079fa	411
f22d8e4b	412	void
03d70c89	413	abs_path(pathsv=Nullsv)
03d70c89	414	SV *pathsv
99f36a73	415	PROTOTYPE: DISABLE
f22d8e4b	416	PPCODE:
2ae52c40	417	{
f22d8e4b	418	dXSTARG;
f22d8e4b	419	char *path;
00536bfc	420	char buf[MAXPATHLEN];
03d70c89	421
ea715489	422	path = pathsv ? SvPV_nolen(pathsv) : ".";
03d70c89	423
00536bfc	424	if (bsd_realpath(path, buf)) {
	425	sv_setpvn(TARG, buf, strlen(buf));
	426	SvPOK_only(TARG);
ea715489	427	SvTAINTED_on(TARG);
2ae52c40	428	}
03d70c89	429	else
ea715489	430	sv_setsv(TARG, &PL_sv_undef);
2ae52c40	431
f22d8e4b	432	XSprePUSH; PUSHTARG;
ea715489	433	#ifndef INCOMPLETE_TAINTS
	434	SvTAINTED_on(TARG);
	435	#endif
2ae52c40	436	}
09122b95	437
	438	#ifdef WIN32
	439
	440	void
	441	getdcwd(...)
	442	PPCODE:
	443	{
	444	dXSTARG;
	445	int drive;
	446	char *dir;
	447
	448	/* Drive 0 is the current drive, 1 is A:, 2 is B:, 3 is C: and so on. */
	449	if ( items == 0 \|\|
	450	(items == 1 && (!SvOK(ST(0)) \|\| (SvPOK(ST(0)) && !SvCUR(ST(0))))))
	451	drive = 0;
	452	else if (items == 1 && SvPOK(ST(0)) && SvCUR(ST(0)) &&
	453	isALPHA(SvPVX(ST(0))[0]))
	454	drive = toUPPER(SvPVX(ST(0))[0]) - 'A' + 1;
	455	else
	456	croak("Usage: getdcwd(DRIVE)");
	457
275e8705	458	New(0,dir,MAXPATHLEN,char);
275e8705	459	if (_getdcwd(drive, dir, MAXPATHLEN)) {
09122b95	460	sv_setpvn(TARG, dir, strlen(dir));
09122b95	461	SvPOK_only(TARG);
	462	}
	463	else
	464	sv_setsv(TARG, &PL_sv_undef);
	465
99f36a73	466	Safefree(dir);
99f36a73	467
09122b95	468	XSprePUSH; PUSHTARG;
	469	#ifndef INCOMPLETE_TAINTS
	470	SvTAINTED_on(TARG);
	471	#endif
	472	}
	473
	474	#endif