[perl5.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(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) : (char *)".";

    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 BS	1	#include "EXTERN.h"
	2	#include "perl.h"
	3	#include "XSUB.h"
99f36a73 RGS	4	#define NEED_sv_2pv_nolen
99f36a73 RGS	5	#include "ppport.h"
0d2079fa	6
c70498c1 JH	7	#ifdef I_UNISTD
	8	# include <unistd.h>
	9	#endif
	10
03d70c89 JH	11	/* The realpath() implementation from OpenBSD 2.9 (realpath.c 1.4)
03d70c89 JH	12	* Renamed here to bsd_realpath() to avoid library conflicts.
99f36a73 RGS	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 JH	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 JH	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 *
a733a8a0	73	bsd_realpath(const char path, char resolved)
03d70c89	74	{
e3d944f4	75	#ifdef VMS
32af7c23 CL	76	dTHX;
32af7c23 CL	77	return Perl_rmsexpand(aTHX_ (char*)path, resolved, NULL, 0);
e3d944f4	78	#else
91f3b821	79	int rootd, serrno;
03d70c89 JH	80	char p, q, wbuf[MAXPATHLEN];
	81	int symlinks = 0;
	82
	83	/* Save the starting point. */
e3d944f4	84	#ifdef HAS_FCHDIR
bae06e14 JH	85	int fd;
bae06e14 JH	86
03d70c89 JH	87	if ((fd = open(".", O_RDONLY)) < 0) {
	88	(void)strcpy(resolved, ".");
	89	return (NULL);
	90	}
e3d944f4 JH	91	#else
	92	char wd[MAXPATHLEN];
	93
	94	if (getcwd(wd, MAXPATHLEN - 1) == NULL) {
	95	(void)strcpy(resolved, ".");
	96	return (NULL);
	97	}
	98	#endif
03d70c89 JH	99
	100	/*
	101	* Find the dirname and basename from the path to be resolved.
	102	* Change directory to the dirname component.
	103	* lstat the basename part.
	104	* if it is a symlink, read in the value and loop.
	105	* if it is a directory, then change to that directory.
	106	* get the current directory name and append the basename.
	107	*/
	108	(void)strncpy(resolved, path, MAXPATHLEN - 1);
	109	resolved[MAXPATHLEN - 1] = '\0';
	110	loop:
	111	q = strrchr(resolved, '/');
	112	if (q != NULL) {
	113	p = q + 1;
	114	if (q == resolved)
	115	q = "/";
	116	else {
	117	do {
	118	--q;
	119	} while (q > resolved && *q == '/');
	120	q[1] = '\0';
	121	q = resolved;
	122	}
	123	if (chdir(q) < 0)
	124	goto err1;
	125	} else
	126	p = resolved;
	127
bae06e14	128	#if defined(HAS_LSTAT) && defined(HAS_READLINK) && defined(HAS_SYMLINK)
91f3b821 GS	129	{
91f3b821 GS	130	struct stat sb;
03d70c89 JH	131	/* Deal with the last component. */
	132	if (lstat(p, &sb) == 0) {
	133	if (S_ISLNK(sb.st_mode)) {
91f3b821	134	int n;
03d70c89 JH	135	if (++symlinks > MAXSYMLINKS) {
	136	errno = ELOOP;
	137	goto err1;
	138	}
	139	n = readlink(p, resolved, MAXPATHLEN-1);
	140	if (n < 0)
	141	goto err1;
	142	resolved[n] = '\0';
	143	goto loop;
	144	}
	145	if (S_ISDIR(sb.st_mode)) {
	146	if (chdir(p) < 0)
	147	goto err1;
	148	p = "";
	149	}
	150	}
91f3b821	151	}
e3d944f4	152	#endif
03d70c89 JH	153
	154	/*
	155	* Save the last component name and get the full pathname of
	156	* the current directory.
	157	*/
	158	(void)strcpy(wbuf, p);
	159	if (getcwd(resolved, MAXPATHLEN) == 0)
	160	goto err1;
	161
	162	/*
	163	* Join the two strings together, ensuring that the right thing
	164	* happens if the last component is empty, or the dirname is root.
	165	*/
	166	if (resolved[0] == '/' && resolved[1] == '\0')
	167	rootd = 1;
	168	else
	169	rootd = 0;
	170
	171	if (*wbuf) {
7f6e23a8	172	if (strlen(resolved) + strlen(wbuf) + (1 - rootd) + 1 > MAXPATHLEN) {
03d70c89 JH	173	errno = ENAMETOOLONG;
	174	goto err1;
	175	}
	176	if (rootd == 0)
	177	(void)strcat(resolved, "/");
	178	(void)strcat(resolved, wbuf);
	179	}
	180
	181	/* Go back to where we came from. */
e3d944f4	182	#ifdef HAS_FCHDIR
03d70c89 JH	183	if (fchdir(fd) < 0) {
	184	serrno = errno;
	185	goto err2;
	186	}
e3d944f4 JH	187	#else
	188	if (chdir(wd) < 0) {
	189	serrno = errno;
	190	goto err2;
	191	}
	192	#endif
03d70c89 JH	193
03d70c89 JH	194	/* It's okay if the close fails, what's an fd more or less? */
9cad6237	195	#ifdef HAS_FCHDIR
03d70c89	196	(void)close(fd);
9cad6237	197	#endif
03d70c89 JH	198	return (resolved);
	199
	200	err1: serrno = errno;
29ab7413	201	#ifdef HAS_FCHDIR
03d70c89	202	(void)fchdir(fd);
29ab7413 JH	203	#else
	204	(void)chdir(wd);
	205	#endif
89423764 GS	206
	207	err2:
	208	#ifdef HAS_FCHDIR
	209	(void)close(fd);
	210	#endif
03d70c89 JH	211	errno = serrno;
03d70c89 JH	212	return (NULL);
e3d944f4	213	#endif
03d70c89 JH	214	}
03d70c89 JH	215
99f36a73 RGS	216	#ifndef SV_CWD_RETURN_UNDEF
	217	#define SV_CWD_RETURN_UNDEF \
	218	sv_setsv(sv, &PL_sv_undef); \
	219	return FALSE
	220	#endif
	221
	222	#ifndef OPpENTERSUB_HASTARG
	223	#define OPpENTERSUB_HASTARG 32 /* Called from OP tree. */
	224	#endif
	225
	226	#ifndef dXSTARG
	227	#define dXSTARG SV * targ = ((PL_op->op_private & OPpENTERSUB_HASTARG) \
	228	? PAD_SV(PL_op->op_targ) : sv_newmortal())
	229	#endif
	230
	231	#ifndef XSprePUSH
	232	#define XSprePUSH (sp = PL_stack_base + ax - 1)
	233	#endif
	234
	235	#ifndef SV_CWD_ISDOT
	236	#define SV_CWD_ISDOT(dp) \
	237	(dp->d_name[0] == '.' && (dp->d_name[1] == '\0' \|\| \
	238	(dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
	239	#endif
	240
a9939470	241	#ifndef getcwd_sv
1955c8df	242	/* Taken from perl 5.8's util.c */
09122b95 RGS	243	#define getcwd_sv(a) Perl_getcwd_sv(aTHX_ a)
09122b95 RGS	244	int Perl_getcwd_sv(pTHX_ register SV *sv)
a9939470 NC	245	{
	246	#ifndef PERL_MICRO
	247
	248	#ifndef INCOMPLETE_TAINTS
	249	SvTAINTED_on(sv);
	250	#endif
	251
	252	#ifdef HAS_GETCWD
	253	{
	254	char buf[MAXPATHLEN];
	255
	256	/* Some getcwd()s automatically allocate a buffer of the given
	257	* size from the heap if they are given a NULL buffer pointer.
	258	* The problem is that this behaviour is not portable. */
	259	if (getcwd(buf, sizeof(buf) - 1)) {
	260	STRLEN len = strlen(buf);
	261	sv_setpvn(sv, buf, len);
	262	return TRUE;
	263	}
	264	else {
	265	sv_setsv(sv, &PL_sv_undef);
	266	return FALSE;
	267	}
	268	}
	269
	270	#else
	271
	272	Stat_t statbuf;
	273	int orig_cdev, orig_cino, cdev, cino, odev, oino, tdev, tino;
	274	int namelen, pathlen=0;
	275	DIR *dir;
	276	Direntry_t *dp;
	277
	278	(void)SvUPGRADE(sv, SVt_PV);
	279
	280	if (PerlLIO_lstat(".", &statbuf) < 0) {
	281	SV_CWD_RETURN_UNDEF;
	282	}
	283
	284	orig_cdev = statbuf.st_dev;
	285	orig_cino = statbuf.st_ino;
	286	cdev = orig_cdev;
	287	cino = orig_cino;
	288
	289	for (;;) {
	290	odev = cdev;
	291	oino = cino;
	292
	293	if (PerlDir_chdir("..") < 0) {
	294	SV_CWD_RETURN_UNDEF;
	295	}
	296	if (PerlLIO_stat(".", &statbuf) < 0) {
	297	SV_CWD_RETURN_UNDEF;
	298	}
	299
	300	cdev = statbuf.st_dev;
	301	cino = statbuf.st_ino;
	302
	303	if (odev == cdev && oino == cino) {
	304	break;
	305	}
	306	if (!(dir = PerlDir_open("."))) {
	307	SV_CWD_RETURN_UNDEF;
	308	}
309
310	while ((dp = PerlDir_read(dir)) != NULL) {
311	#ifdef DIRNAMLEN
312	namelen = dp->d_namlen;
313	#else
314	namelen = strlen(dp->d_name);
315	#endif
316	/* skip . and .. */
317	if (SV_CWD_ISDOT(dp)) {
318	continue;
319	}
320
321	if (PerlLIO_lstat(dp->d_name, &statbuf) < 0) {
322	SV_CWD_RETURN_UNDEF;
323	}
324
325	tdev = statbuf.st_dev;
326	tino = statbuf.st_ino;
327	if (tino == oino && tdev == odev) {
328	break;
329	}
330	}
331
332	if (!dp) {
333	SV_CWD_RETURN_UNDEF;
334	}
335
336	if (pathlen + namelen + 1 >= MAXPATHLEN) {
337	SV_CWD_RETURN_UNDEF;
338	}
339
340	SvGROW(sv, pathlen + namelen + 1);
341
342	if (pathlen) {
343	/* shift down */
344	Move(SvPVX(sv), SvPVX(sv) + namelen + 1, pathlen, char);
345	}
346
347	/* prepend current directory to the front */
348	*SvPVX(sv) = '/';
349	Move(dp->d_name, SvPVX(sv)+1, namelen, char);
350	pathlen += (namelen + 1);
351
352	#ifdef VOID_CLOSEDIR
353	PerlDir_close(dir);
354	#else
355	if (PerlDir_close(dir) < 0) {
356	SV_CWD_RETURN_UNDEF;
357	}
358	#endif
359	}
360
361	if (pathlen) {
362	SvCUR_set(sv, pathlen);
363	*SvEND(sv) = '\0';
364	SvPOK_only(sv);
365
366	if (PerlDir_chdir(SvPVX(sv)) < 0) {
367	SV_CWD_RETURN_UNDEF;
368	}
369	}
370	if (PerlLIO_stat(".", &statbuf) < 0) {
371	SV_CWD_RETURN_UNDEF;
372	}
373
374	cdev = statbuf.st_dev;
375	cino = statbuf.st_ino;
376
377	if (cdev != orig_cdev \|\| cino != orig_cino) {
378	Perl_croak(aTHX_ "Unstable directory path, "
379	"current directory changed unexpectedly");
380	}
381
382	return TRUE;
383	#endif
384
385	#else
386	return FALSE;
387	#endif
388	}
389
390	#endif
391
392
f22d8e4b	393	MODULE = Cwd PACKAGE = Cwd
0d2079fa	394
f22d8e4b	395	PROTOTYPES: ENABLE
0d2079fa	396
f22d8e4b DM	397	void
f22d8e4b DM	398	fastcwd()
7ddb28a3	399	PROTOTYPE: DISABLE
f22d8e4b DM	400	PPCODE:
	401	{
	402	dXSTARG;
89423764	403	getcwd_sv(TARG);
f22d8e4b	404	XSprePUSH; PUSHTARG;
248785eb RGS	405	#ifndef INCOMPLETE_TAINTS
	406	SvTAINTED_on(TARG);
	407	#endif
0d2079fa BS	408	}
0d2079fa BS	409
f22d8e4b	410	void
03d70c89 JH	411	abs_path(pathsv=Nullsv)
03d70c89 JH	412	SV *pathsv
99f36a73	413	PROTOTYPE: DISABLE
f22d8e4b	414	PPCODE:
2ae52c40	415	{
f22d8e4b DM	416	dXSTARG;
f22d8e4b DM	417	char *path;
00536bfc	418	char buf[MAXPATHLEN];
03d70c89	419
07409e01	420	path = pathsv ? SvPV_nolen(pathsv) : (char *)".";
03d70c89	421
00536bfc JH	422	if (bsd_realpath(path, buf)) {
	423	sv_setpvn(TARG, buf, strlen(buf));
	424	SvPOK_only(TARG);
ea715489	425	SvTAINTED_on(TARG);
2ae52c40	426	}
03d70c89	427	else
ea715489	428	sv_setsv(TARG, &PL_sv_undef);
2ae52c40	429
f22d8e4b	430	XSprePUSH; PUSHTARG;
ea715489 JH	431	#ifndef INCOMPLETE_TAINTS
	432	SvTAINTED_on(TARG);
	433	#endif
2ae52c40	434	}
09122b95 RGS	435
	436	#ifdef WIN32
	437
	438	void
	439	getdcwd(...)
	440	PPCODE:
	441	{
	442	dXSTARG;
	443	int drive;
	444	char *dir;
	445
	446	/* Drive 0 is the current drive, 1 is A:, 2 is B:, 3 is C: and so on. */
	447	if ( items == 0 \|\|
	448	(items == 1 && (!SvOK(ST(0)) \|\| (SvPOK(ST(0)) && !SvCUR(ST(0))))))
	449	drive = 0;
	450	else if (items == 1 && SvPOK(ST(0)) && SvCUR(ST(0)) &&
	451	isALPHA(SvPVX(ST(0))[0]))
	452	drive = toUPPER(SvPVX(ST(0))[0]) - 'A' + 1;
	453	else
	454	croak("Usage: getdcwd(DRIVE)");
	455
275e8705 RGS	456	New(0,dir,MAXPATHLEN,char);
275e8705 RGS	457	if (_getdcwd(drive, dir, MAXPATHLEN)) {
09122b95	458	sv_setpvn(TARG, dir, strlen(dir));
09122b95 RGS	459	SvPOK_only(TARG);
	460	}
	461	else
	462	sv_setsv(TARG, &PL_sv_undef);
	463
99f36a73 RGS	464	Safefree(dir);
99f36a73 RGS	465
09122b95 RGS	466	XSprePUSH; PUSHTARG;
	467	#ifndef INCOMPLETE_TAINTS
	468	SvTAINTED_on(TARG);
	469	#endif
	470	}
	471
	472	#endif