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#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
/* Originally written in Perl by John Bazik; rewritten in C by Ben Sugars.
* Comments from the orignal:
* This is a faster version of getcwd. It's also more dangerous
* because you might chdir out of a directory that you can't chdir
* back into. */
char *
_cwdxs_fastcwd(void)
{
/* XXX Should we just use getcwd(3) if available? */
struct stat statbuf;
int orig_cdev, orig_cino, cdev, cino, odev, oino, tdev, tino;
int i = 0, j = 0, k = 0, ndirs = 16, pathlen = 0, namelen;
DIR *dir;
Direntry_t *dp;
char **names, *path;
Newz(0, names, ndirs, char*);
if (PerlLIO_lstat(".", &statbuf) < 0) {
Safefree(names);
return FALSE;
}
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) {
Safefree(names);
return FALSE;
}
if (PerlLIO_stat(".", &statbuf) < 0) {
Safefree(names);
return FALSE;
}
cdev = statbuf.st_dev;
cino = statbuf.st_ino;
if (odev == cdev && oino == cino)
break;
if (!(dir = PerlDir_open("."))) {
Safefree(names);
return FALSE;
}
while ((dp = PerlDir_read(dir)) != NULL) {
if (PerlLIO_lstat(dp->d_name, &statbuf) < 0) {
Safefree(names);
return FALSE;
}
if (strEQ(dp->d_name, "."))
continue;
if (strEQ(dp->d_name, ".."))
continue;
tdev = statbuf.st_dev;
tino = statbuf.st_ino;
if (tino == oino && tdev == odev)
break;
}
if (!dp) {
Safefree(names);
return FALSE;
}
if (i >= ndirs) {
ndirs += 16;
Renew(names, ndirs, char*);
}
#ifdef DIRNAMLEN
namelen = dp->d_namlen;
#else
namelen = strlen(dp->d_name);
#endif
Newz(0, *(names + i), namelen + 1, char);
Copy(dp->d_name, *(names + i), namelen, char);
*(names[i] + namelen) = '\0';
pathlen += (namelen + 1);
++i;
#ifdef VOID_CLOSEDIR
PerlDir_close(dir);
#else
if (PerlDir_close(dir) < 0) {
Safefree(names);
return FALSE;
}
#endif
}
Newz(0, path, pathlen + 1, char);
for (j = i - 1; j >= 0; j--) {
*(path + k) = '/';
Copy(names[j], path + k + 1, strlen(names[j]) + 1, char);
k = k + strlen(names[j]) + 1;
Safefree(names[j]);
}
if (PerlDir_chdir(path) < 0) {
Safefree(names);
Safefree(path);
return FALSE;
}
if (PerlLIO_stat(".", &statbuf) < 0) {
Safefree(names);
Safefree(path);
return FALSE;
}
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");
Safefree(names);
return(path);
}
MODULE = Cwd PACKAGE = Cwd
PROTOTYPES: ENABLE
char *
_fastcwd()
PPCODE:
char * buf;
buf = _cwdxs_fastcwd();
if (buf) {
PUSHs(sv_2mortal(newSVpv(buf, 0)));
Safefree(buf);
}
else
XSRETURN_UNDEF;
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