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

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.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 */

/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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 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
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));
        Safefree(dir);
        SvPOK_only(TARG);
    }
    else
        sv_setsv(TARG, &PL_sv_undef);

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