5 /* Originally written in Perl by John Bazik; rewritten in C by Ben Sugars.
6 * Comments from the orignal:
7 * This is a faster version of getcwd. It's also more dangerous
8 * because you might chdir out of a directory that you can't chdir
13 /* XXX Should we just use getcwd(3) if available? */
15 int orig_cdev, orig_cino, cdev, cino, odev, oino, tdev, tino;
16 int i = 0, j = 0, k = 0, ndirs = 16, pathlen = 0, namelen;
21 Newz(0, names, ndirs, char*);
23 if (PerlLIO_lstat(".", &statbuf) < 0) {
27 orig_cdev = statbuf.st_dev;
28 orig_cino = statbuf.st_ino;
35 if (PerlDir_chdir("..") < 0) {
39 if (PerlLIO_stat(".", &statbuf) < 0) {
43 cdev = statbuf.st_dev;
44 cino = statbuf.st_ino;
45 if (odev == cdev && oino == cino)
48 if (!(dir = PerlDir_open("."))) {
53 while ((dp = PerlDir_read(dir)) != NULL) {
54 if (PerlLIO_lstat(dp->d_name, &statbuf) < 0) {
58 if (strEQ(dp->d_name, "."))
60 if (strEQ(dp->d_name, ".."))
62 tdev = statbuf.st_dev;
63 tino = statbuf.st_ino;
64 if (tino == oino && tdev == odev)
75 Renew(names, ndirs, char*);
78 namelen = dp->d_namlen;
80 namelen = strlen(dp->d_name);
82 Newz(0, *(names + i), namelen + 1, char);
83 Copy(dp->d_name, *(names + i), namelen, char);
84 *(names[i] + namelen) = '\0';
85 pathlen += (namelen + 1);
91 if (PerlDir_close(dir) < 0) {
98 Newz(0, path, pathlen + 1, char);
99 for (j = i - 1; j >= 0; j--) {
101 Copy(names[j], path + k + 1, strlen(names[j]) + 1, char);
102 k = k + strlen(names[j]) + 1;
106 if (PerlDir_chdir(path) < 0) {
111 if (PerlLIO_stat(".", &statbuf) < 0) {
116 cdev = statbuf.st_dev;
117 cino = statbuf.st_ino;
118 if (cdev != orig_cdev || cino != orig_cino)
119 Perl_croak(aTHX_ "Unstable directory path, current directory changed unexpectedly");
126 _cwdxs_abs_path(char *start)
130 char dotdots[MAXPATHLEN] = { 0 };
131 char dir[MAXPATHLEN] = { 0 };
132 char name[MAXPATHLEN] = { 0 };
135 struct stat cst, pst, tst;
137 if (PerlLIO_stat(start, &cst) < 0) {
138 warn("abs_path: stat(\"%s\"): %s", start, Strerror(errno));
142 Newz(0, cwd, MAXPATHLEN, char);
143 Copy(start, dotdots, strlen(start), char);
146 strcat(dotdots, "/..");
147 StructCopy(&cst, &pst, struct stat);
149 if (PerlLIO_stat(dotdots, &cst) < 0) {
151 warn("abs_path: stat(\"%s\"): %s", dotdots, Strerror(errno));
155 if (pst.st_dev == cst.st_dev && pst.st_ino == cst.st_ino) {
156 /* We've reached the root: previous is same as current */
159 STRLEN dotdotslen = strlen(dotdots);
161 /* Scan through the dir looking for name of previous */
162 if (!(parent = PerlDir_open(dotdots))) {
164 warn("abs_path: opendir(\"%s\"): %s", dotdots, Strerror(errno));
168 SETERRNO(0,SS$_NORMAL); /* for readdir() */
169 while ((dp = PerlDir_read(parent)) != NULL) {
170 if (strEQ(dp->d_name, "."))
172 if (strEQ(dp->d_name, ".."))
175 Copy(dotdots, name, dotdotslen, char);
176 name[dotdotslen] = '/';
178 namelen = dp->d_namlen;
180 namelen = strlen(dp->d_name);
182 Copy(dp->d_name, name + dotdotslen + 1, namelen, char);
183 name[dotdotslen + 1 + namelen] = 0;
185 if (PerlLIO_lstat(name, &tst) < 0) {
187 PerlDir_close(parent);
188 warn("abs_path: lstat(\"%s\"): %s", name, Strerror(errno));
192 if (tst.st_dev == pst.st_dev && tst.st_ino == pst.st_ino)
195 SETERRNO(0,SS$_NORMAL); /* for readdir() */
200 warn("abs_path: readdir(\"%s\"): %s", dotdots, Strerror(errno));
205 Move(cwd, cwd + namelen + 1, strlen(cwd), char);
206 Copy(dp->d_name, cwd + 1, namelen, char);
210 if (PerlDir_close(parent) < 0) {
211 warn("abs_path: closedir(\"%s\"): %s", dotdots, Strerror(errno));
224 MODULE = Cwd PACKAGE = Cwd
232 buf = _cwdxs_fastcwd();
234 PUSHs(sv_2mortal(newSVpv(buf, 0)));
241 _abs_path(start = ".")
246 buf = _cwdxs_abs_path(start);
248 PUSHs(sv_2mortal(newSVpv(buf, 0)));