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

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#ifndef NO_PPPORT_H
#   define NEED_my_strlcpy
#   define NEED_my_strlcat
#   include "ppport.h"
#endif

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

/* The realpath() implementation from OpenBSD 3.9 to 4.2 (realpath.c 1.13)
 * Renamed here to bsd_realpath() to avoid library conflicts.
 */

/* 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) 2003 Constantin S. Svintsoff <kostik@iclub.nsu.ru>
 *
 * 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. The names of the authors may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */

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

#ifndef MAXSYMLINKS
#define MAXSYMLINKS 8
#endif

/*
 * char *realpath(const char *path, char resolved[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;
	const char *p;
	char *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) {
		const char *dir;
		p = q + 1;
		if (q == resolved)
			dir = "/";
		else {
			do {
				--q;
			} while (q > resolved && *q == '/');
			q[1] = '\0';
			dir = resolved;
		}
		if (chdir(dir) < 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
getcwd(...)
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
}

#if defined(WIN32) && !defined(UNDER_CE)

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"
dfa4e5d3	4	#ifndef NO_PPPORT_H
bf7c0a3d	5	# define NEED_my_strlcpy
bf7c0a3d	6	# define NEED_my_strlcat
4ce45bab	7	# include "ppport.h"
4ce45bab	8	#endif
0d2079fa	9
c70498c1	10	#ifdef I_UNISTD
	11	# include <unistd.h>
	12	#endif
	13
bf7c0a3d	14	/* The realpath() implementation from OpenBSD 3.9 to 4.2 (realpath.c 1.13)
03d70c89	15	* Renamed here to bsd_realpath() to avoid library conflicts.
99f36a73	16	*/
	17
	18	/* See
	19	* http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2004-11/msg00979.html
	20	* for the details of why the BSD license is compatible with the
	21	* AL/GPL standard perl license.
	22	*/
03d70c89	23
03d70c89	24	/*
bf7c0a3d	25	* Copyright (c) 2003 Constantin S. Svintsoff <kostik@iclub.nsu.ru>
03d70c89	26	*
	27	* Redistribution and use in source and binary forms, with or without
	28	* modification, are permitted provided that the following conditions
	29	* are met:
	30	* 1. Redistributions of source code must retain the above copyright
	31	* notice, this list of conditions and the following disclaimer.
	32	* 2. Redistributions in binary form must reproduce the above copyright
	33	* notice, this list of conditions and the following disclaimer in the
	34	* documentation and/or other materials provided with the distribution.
bf7c0a3d	35	* 3. The names of the authors may not be used to endorse or promote
	36	* products derived from this software without specific prior written
	37	* permission.
03d70c89	38	*
bf7c0a3d	39	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
03d70c89	40	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
03d70c89	41	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
bf7c0a3d	42	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
03d70c89	43	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	44	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	45	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	46	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	47	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	48	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	49	* SUCH DAMAGE.
	50	*/
	51
03d70c89	52	/* OpenBSD system #includes removed since the Perl ones should do. --jhi */
	53
	54	#ifndef MAXSYMLINKS
	55	#define MAXSYMLINKS 8
	56	#endif
	57
	58	/*
bf7c0a3d	59	* char realpath(const char path, char resolved[MAXPATHLEN]);
03d70c89	60	*
	61	* Find the real name of path, by removing all ".", ".." and symlink
	62	* components. Returns (resolved) on success, or (NULL) on failure,
	63	* in which case the path which caused trouble is left in (resolved).
	64	*/
	65	static
	66	char *
a733a8a0	67	bsd_realpath(const char path, char resolved)
03d70c89	68	{
e3d944f4	69	#ifdef VMS
32af7c23	70	dTHX;
32af7c23	71	return Perl_rmsexpand(aTHX_ (char*)path, resolved, NULL, 0);
e3d944f4	72	#else
91f3b821	73	int rootd, serrno;
f5725584	74	const char *p;
f5725584	75	char *q, wbuf[MAXPATHLEN];
03d70c89	76	int symlinks = 0;
	77
	78	/* Save the starting point. */
e3d944f4	79	#ifdef HAS_FCHDIR
bae06e14	80	int fd;
bae06e14	81
03d70c89	82	if ((fd = open(".", O_RDONLY)) < 0) {
	83	(void)strcpy(resolved, ".");
	84	return (NULL);
	85	}
e3d944f4	86	#else
	87	char wd[MAXPATHLEN];
	88
	89	if (getcwd(wd, MAXPATHLEN - 1) == NULL) {
	90	(void)strcpy(resolved, ".");
	91	return (NULL);
	92	}
	93	#endif
03d70c89	94
	95	/*
	96	* Find the dirname and basename from the path to be resolved.
	97	* Change directory to the dirname component.
	98	* lstat the basename part.
	99	* if it is a symlink, read in the value and loop.
	100	* if it is a directory, then change to that directory.
	101	* get the current directory name and append the basename.
	102	*/
	103	(void)strncpy(resolved, path, MAXPATHLEN - 1);
	104	resolved[MAXPATHLEN - 1] = '\0';
	105	loop:
	106	q = strrchr(resolved, '/');
	107	if (q != NULL) {
f5725584	108	const char *dir;
03d70c89	109	p = q + 1;
03d70c89	110	if (q == resolved)
f5725584	111	dir = "/";
03d70c89	112	else {
	113	do {
	114	--q;
	115	} while (q > resolved && *q == '/');
	116	q[1] = '\0';
f5725584	117	dir = resolved;
03d70c89	118	}
f5725584	119	if (chdir(dir) < 0)
03d70c89	120	goto err1;
	121	} else
	122	p = resolved;
	123
bae06e14	124	#if defined(HAS_LSTAT) && defined(HAS_READLINK) && defined(HAS_SYMLINK)
91f3b821	125	{
91f3b821	126	struct stat sb;
03d70c89	127	/* Deal with the last component. */
	128	if (lstat(p, &sb) == 0) {
	129	if (S_ISLNK(sb.st_mode)) {
91f3b821	130	int n;
03d70c89	131	if (++symlinks > MAXSYMLINKS) {
	132	errno = ELOOP;
	133	goto err1;
	134	}
	135	n = readlink(p, resolved, MAXPATHLEN-1);
	136	if (n < 0)
	137	goto err1;
	138	resolved[n] = '\0';
	139	goto loop;
	140	}
	141	if (S_ISDIR(sb.st_mode)) {
	142	if (chdir(p) < 0)
	143	goto err1;
	144	p = "";
	145	}
	146	}
91f3b821	147	}
e3d944f4	148	#endif
03d70c89	149
	150	/*
	151	* Save the last component name and get the full pathname of
	152	* the current directory.
	153	*/
	154	(void)strcpy(wbuf, p);
	155	if (getcwd(resolved, MAXPATHLEN) == 0)
	156	goto err1;
	157
	158	/*
	159	* Join the two strings together, ensuring that the right thing
	160	* happens if the last component is empty, or the dirname is root.
	161	*/
	162	if (resolved[0] == '/' && resolved[1] == '\0')
	163	rootd = 1;
	164	else
	165	rootd = 0;
	166
	167	if (*wbuf) {
7f6e23a8	168	if (strlen(resolved) + strlen(wbuf) + (1 - rootd) + 1 > MAXPATHLEN) {
03d70c89	169	errno = ENAMETOOLONG;
	170	goto err1;
	171	}
	172	if (rootd == 0)
	173	(void)strcat(resolved, "/");
	174	(void)strcat(resolved, wbuf);
	175	}
	176
	177	/* Go back to where we came from. */
e3d944f4	178	#ifdef HAS_FCHDIR
03d70c89	179	if (fchdir(fd) < 0) {
	180	serrno = errno;
	181	goto err2;
	182	}
e3d944f4	183	#else
	184	if (chdir(wd) < 0) {
	185	serrno = errno;
	186	goto err2;
	187	}
	188	#endif
03d70c89	189
03d70c89	190	/* It's okay if the close fails, what's an fd more or less? */
9cad6237	191	#ifdef HAS_FCHDIR
03d70c89	192	(void)close(fd);
9cad6237	193	#endif
03d70c89	194	return (resolved);
	195
	196	err1: serrno = errno;
29ab7413	197	#ifdef HAS_FCHDIR
03d70c89	198	(void)fchdir(fd);
29ab7413	199	#else
	200	(void)chdir(wd);
	201	#endif
89423764	202
	203	err2:
	204	#ifdef HAS_FCHDIR
	205	(void)close(fd);
	206	#endif
03d70c89	207	errno = serrno;
03d70c89	208	return (NULL);
e3d944f4	209	#endif
03d70c89	210	}
03d70c89	211
99f36a73	212	#ifndef SV_CWD_RETURN_UNDEF
	213	#define SV_CWD_RETURN_UNDEF \
	214	sv_setsv(sv, &PL_sv_undef); \
	215	return FALSE
	216	#endif
	217
	218	#ifndef OPpENTERSUB_HASTARG
	219	#define OPpENTERSUB_HASTARG 32 /* Called from OP tree. */
	220	#endif
	221
	222	#ifndef dXSTARG
	223	#define dXSTARG SV * targ = ((PL_op->op_private & OPpENTERSUB_HASTARG) \
	224	? PAD_SV(PL_op->op_targ) : sv_newmortal())
	225	#endif
	226
	227	#ifndef XSprePUSH
	228	#define XSprePUSH (sp = PL_stack_base + ax - 1)
	229	#endif
	230
	231	#ifndef SV_CWD_ISDOT
	232	#define SV_CWD_ISDOT(dp) \
	233	(dp->d_name[0] == '.' && (dp->d_name[1] == '\0' \|\| \
	234	(dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
	235	#endif
	236
a9939470	237	#ifndef getcwd_sv
1955c8df	238	/* Taken from perl 5.8's util.c */
09122b95	239	#define getcwd_sv(a) Perl_getcwd_sv(aTHX_ a)
09122b95	240	int Perl_getcwd_sv(pTHX_ register SV *sv)
a9939470	241	{
	242	#ifndef PERL_MICRO
	243
	244	#ifndef INCOMPLETE_TAINTS
	245	SvTAINTED_on(sv);
	246	#endif
	247
	248	#ifdef HAS_GETCWD
	249	{
	250	char buf[MAXPATHLEN];
	251
	252	/* Some getcwd()s automatically allocate a buffer of the given
	253	* size from the heap if they are given a NULL buffer pointer.
	254	* The problem is that this behaviour is not portable. */
	255	if (getcwd(buf, sizeof(buf) - 1)) {
	256	STRLEN len = strlen(buf);
	257	sv_setpvn(sv, buf, len);
	258	return TRUE;
	259	}
	260	else {
	261	sv_setsv(sv, &PL_sv_undef);
	262	return FALSE;
	263	}
	264	}
	265
	266	#else
f6342b4b	267	{
a9939470	268	Stat_t statbuf;
	269	int orig_cdev, orig_cino, cdev, cino, odev, oino, tdev, tino;
	270	int namelen, pathlen=0;
	271	DIR *dir;
	272	Direntry_t *dp;
	273
	274	(void)SvUPGRADE(sv, SVt_PV);
	275
	276	if (PerlLIO_lstat(".", &statbuf) < 0) {
	277	SV_CWD_RETURN_UNDEF;
	278	}
	279
	280	orig_cdev = statbuf.st_dev;
	281	orig_cino = statbuf.st_ino;
	282	cdev = orig_cdev;
	283	cino = orig_cino;
	284
	285	for (;;) {
	286	odev = cdev;
	287	oino = cino;
	288
	289	if (PerlDir_chdir("..") < 0) {
	290	SV_CWD_RETURN_UNDEF;
	291	}
	292	if (PerlLIO_stat(".", &statbuf) < 0) {
	293	SV_CWD_RETURN_UNDEF;
	294	}
	295
	296	cdev = statbuf.st_dev;
	297	cino = statbuf.st_ino;
	298
	299	if (odev == cdev && oino == cino) {
	300	break;
	301	}
	302	if (!(dir = PerlDir_open("."))) {
	303	SV_CWD_RETURN_UNDEF;
	304	}
	305
	306	while ((dp = PerlDir_read(dir)) != NULL) {
	307	#ifdef DIRNAMLEN
	308	namelen = dp->d_namlen;
	309	#else
	310	namelen = strlen(dp->d_name);
	311	#endif
	312	/* skip . and .. */
	313	if (SV_CWD_ISDOT(dp)) {
	314	continue;
	315	}
	316
	317	if (PerlLIO_lstat(dp->d_name, &statbuf) < 0) {
	318	SV_CWD_RETURN_UNDEF;
	319	}
	320
	321	tdev = statbuf.st_dev;
	322	tino = statbuf.st_ino;
	323	if (tino == oino && tdev == odev) {
	324	break;
	325	}
	326	}
	327
	328	if (!dp) {
	329	SV_CWD_RETURN_UNDEF;
	330	}
	331
332	if (pathlen + namelen + 1 >= MAXPATHLEN) {
333	SV_CWD_RETURN_UNDEF;
334	}
335
336	SvGROW(sv, pathlen + namelen + 1);
337
338	if (pathlen) {
339	/* shift down */
340	Move(SvPVX(sv), SvPVX(sv) + namelen + 1, pathlen, char);
341	}
342
343	/* prepend current directory to the front */
344	*SvPVX(sv) = '/';
345	Move(dp->d_name, SvPVX(sv)+1, namelen, char);
346	pathlen += (namelen + 1);
347
348	#ifdef VOID_CLOSEDIR
349	PerlDir_close(dir);
350	#else
351	if (PerlDir_close(dir) < 0) {
352	SV_CWD_RETURN_UNDEF;
353	}
354	#endif
355	}
356
357	if (pathlen) {
358	SvCUR_set(sv, pathlen);
359	*SvEND(sv) = '\0';
360	SvPOK_only(sv);
361
362	if (PerlDir_chdir(SvPVX(sv)) < 0) {
363	SV_CWD_RETURN_UNDEF;
364	}
365	}
366	if (PerlLIO_stat(".", &statbuf) < 0) {
367	SV_CWD_RETURN_UNDEF;
368	}
369
370	cdev = statbuf.st_dev;
371	cino = statbuf.st_ino;
372
373	if (cdev != orig_cdev \|\| cino != orig_cino) {
374	Perl_croak(aTHX_ "Unstable directory path, "
375	"current directory changed unexpectedly");
376	}
377
378	return TRUE;
f6342b4b	379	}
a9939470	380	#endif
	381
	382	#else
	383	return FALSE;
	384	#endif
	385	}
	386
	387	#endif
	388
	389
f22d8e4b	390	MODULE = Cwd PACKAGE = Cwd
0d2079fa	391
f22d8e4b	392	PROTOTYPES: ENABLE
0d2079fa	393
f22d8e4b	394	void
f22d8e4b	395	fastcwd()
7ddb28a3	396	PROTOTYPE: DISABLE
f22d8e4b	397	PPCODE:
	398	{
	399	dXSTARG;
89423764	400	getcwd_sv(TARG);
f22d8e4b	401	XSprePUSH; PUSHTARG;
248785eb	402	#ifndef INCOMPLETE_TAINTS
	403	SvTAINTED_on(TARG);
	404	#endif
0d2079fa	405	}
0d2079fa	406
f22d8e4b	407	void
23bb49fa	408	getcwd(...)
fa52125f	409	PROTOTYPE: DISABLE
	410	PPCODE:
	411	{
	412	dXSTARG;
	413	getcwd_sv(TARG);
	414	XSprePUSH; PUSHTARG;
	415	#ifndef INCOMPLETE_TAINTS
	416	SvTAINTED_on(TARG);
	417	#endif
	418	}
	419
	420	void
03d70c89	421	abs_path(pathsv=Nullsv)
03d70c89	422	SV *pathsv
99f36a73	423	PROTOTYPE: DISABLE
f22d8e4b	424	PPCODE:
2ae52c40	425	{
f22d8e4b	426	dXSTARG;
f22d8e4b	427	char *path;
00536bfc	428	char buf[MAXPATHLEN];
03d70c89	429
07409e01	430	path = pathsv ? SvPV_nolen(pathsv) : (char *)".";
03d70c89	431
00536bfc	432	if (bsd_realpath(path, buf)) {
	433	sv_setpvn(TARG, buf, strlen(buf));
	434	SvPOK_only(TARG);
ea715489	435	SvTAINTED_on(TARG);
2ae52c40	436	}
03d70c89	437	else
ea715489	438	sv_setsv(TARG, &PL_sv_undef);
2ae52c40	439
f22d8e4b	440	XSprePUSH; PUSHTARG;
ea715489	441	#ifndef INCOMPLETE_TAINTS
	442	SvTAINTED_on(TARG);
	443	#endif
2ae52c40	444	}
09122b95	445
42d1cefd	446	#if defined(WIN32) && !defined(UNDER_CE)
09122b95	447
	448	void
	449	getdcwd(...)
	450	PPCODE:
	451	{
	452	dXSTARG;
	453	int drive;
	454	char *dir;
	455
	456	/* Drive 0 is the current drive, 1 is A:, 2 is B:, 3 is C: and so on. */
	457	if ( items == 0 \|\|
	458	(items == 1 && (!SvOK(ST(0)) \|\| (SvPOK(ST(0)) && !SvCUR(ST(0))))))
	459	drive = 0;
	460	else if (items == 1 && SvPOK(ST(0)) && SvCUR(ST(0)) &&
	461	isALPHA(SvPVX(ST(0))[0]))
	462	drive = toUPPER(SvPVX(ST(0))[0]) - 'A' + 1;
	463	else
	464	croak("Usage: getdcwd(DRIVE)");
	465
275e8705	466	New(0,dir,MAXPATHLEN,char);
275e8705	467	if (_getdcwd(drive, dir, MAXPATHLEN)) {
09122b95	468	sv_setpvn(TARG, dir, strlen(dir));
09122b95	469	SvPOK_only(TARG);
	470	}
	471	else
	472	sv_setsv(TARG, &PL_sv_undef);
	473
99f36a73	474	Safefree(dir);
99f36a73	475
09122b95	476	XSprePUSH; PUSHTARG;
	477	#ifndef INCOMPLETE_TAINTS
	478	SvTAINTED_on(TARG);
	479	#endif
	480	}
	481
	482	#endif