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-rw-r--r--libc/sysdeps/linux/common/getcwd.c129
1 files changed, 63 insertions, 66 deletions
diff --git a/libc/sysdeps/linux/common/getcwd.c b/libc/sysdeps/linux/common/getcwd.c
index d1740fa31..daf056e98 100644
--- a/libc/sysdeps/linux/common/getcwd.c
+++ b/libc/sysdeps/linux/common/getcwd.c
@@ -9,45 +9,10 @@
#ifdef __NR_getcwd
-#ifndef INLINE_SYSCALL
-#define INLINE_SYSCALL(name, nr, args...) __syscall_getcwd (args)
#define __NR___syscall_getcwd __NR_getcwd
-static inline _syscall2(int, __syscall_getcwd, char *, buf, unsigned long, size);
-#endif
-
-char *getcwd(char *buf, int size)
-{
- int olderrno, ret;
- char *allocbuf;
+static inline
+_syscall2(int, __syscall_getcwd, char *, buf, unsigned long, size);
- if (size == 0) {
- if (buf != NULL) {
- __set_errno(EINVAL);
- return NULL;
- }
- size = PATH_MAX;
- }
- if (size < 3) {
- __set_errno(ERANGE);
- return NULL;
- }
- allocbuf=NULL;
- olderrno = errno;
- if (buf == NULL) {
- buf = allocbuf = malloc (size);
- if (buf == NULL)
- return NULL;
- }
- ret = INLINE_SYSCALL(getcwd, 2, buf, size);
- if (ret < 0) {
- if (allocbuf) {
- free(allocbuf);
- }
- return NULL;
- }
- __set_errno(olderrno);
- return buf;
-}
#else
/* If the syscall is not present, we have to walk up the
@@ -74,8 +39,9 @@ static char *search_dir(dev_t this_dev, ino_t this_ino, char *path_buf, int path
int slow_search = (sizeof(ino_t) != sizeof(d->d_ino));
#endif
- if (stat(path_buf, &st) < 0)
- return 0;
+ if (stat(path_buf, &st) < 0) {
+ goto oops;
+ }
#ifdef FAST_DIR_SEARCH_POSSIBLE
if (this_dev != st.st_dev)
slow_search = 1;
@@ -85,8 +51,7 @@ static char *search_dir(dev_t this_dev, ino_t this_ino, char *path_buf, int path
ptr = path_buf + slen - 1;
if (*ptr != '/') {
if (slen + 2 > path_size) {
- __set_errno(ERANGE);
- return 0;
+ goto oops;
}
strcpy(++ptr, "/");
slen++;
@@ -94,16 +59,16 @@ static char *search_dir(dev_t this_dev, ino_t this_ino, char *path_buf, int path
slen++;
dp = opendir(path_buf);
- if (dp == 0)
- return 0;
+ if (dp == 0) {
+ goto oops;
+ }
while ((d = readdir(dp)) != 0) {
#ifdef FAST_DIR_SEARCH_POSSIBLE
if (slow_search || this_ino == d->d_ino) {
#endif
if (slen + strlen(d->d_name) > path_size) {
- __set_errno(ERANGE);
- return 0;
+ goto oops;
}
strcpy(ptr + 1, d->d_name);
if (stat(path_buf, &st) < 0)
@@ -118,7 +83,10 @@ static char *search_dir(dev_t this_dev, ino_t this_ino, char *path_buf, int path
}
closedir(dp);
- __set_errno(ENOENT);
+ return 0;
+
+oops:
+ __set_errno(ERANGE);
return 0;
}
@@ -129,54 +97,83 @@ static char *recurser(char *path_buf, int path_size, dev_t root_dev, ino_t root_
dev_t this_dev;
ino_t this_ino;
- if (stat(path_buf, &st) < 0)
- return 0;
+ if (stat(path_buf, &st) < 0) {
+ if (errno != EFAULT)
+ goto oops;
+ return 0;
+ }
this_dev = st.st_dev;
this_ino = st.st_ino;
if (this_dev == root_dev && this_ino == root_ino) {
+ if (path_size < 2) {
+ goto oops;
+ }
strcpy(path_buf, "/");
return path_buf;
}
if (strlen(path_buf) + 4 > path_size) {
- __set_errno(ERANGE);
- return 0;
+ goto oops;
}
strcat(path_buf, "/..");
if (recurser(path_buf, path_size, root_dev, root_ino) == 0)
return 0;
return search_dir(this_dev, this_ino, path_buf, path_size);
+oops:
+ __set_errno(ERANGE);
+ return 0;
+}
+
+static inline
+int __syscall_getcwd(char * buf, unsigned long size)
+{
+ int len;
+ char *cwd;
+ struct stat st;
+ int olderrno;
+
+ olderrno = errno;
+ len = -1;
+ cwd = recurser(buf, size, st.st_dev, st.st_ino);
+ if (cwd) {
+ len = strlen(buf);
+ __set_errno(olderrno);
+ }
+ return len;
}
+#endif
char *getcwd(char *buf, int size)
{
- struct stat st;
+ int ret;
+ char *path;
+ size_t alloc_size = size;
if (size == 0) {
if (buf != NULL) {
__set_errno(EINVAL);
return NULL;
}
- size = PATH_MAX;
- }
- if (size < 3) {
- __set_errno(ERANGE);
- return NULL;
+ alloc_size = PATH_MAX;
}
-
+ path=buf;
if (buf == NULL) {
- buf = malloc (size);
- if (buf == NULL)
+ path = malloc(alloc_size);
+ if (path == NULL)
return NULL;
}
-
- strcpy(buf, ".");
- if (stat("/", &st) < 0) {
- return NULL;
+ ret = __syscall_getcwd(path, alloc_size);
+ if (ret >= 0)
+ {
+ if (buf == NULL && size == 0)
+ buf = realloc(path, ret);
+ if (buf == NULL)
+ buf = path;
+ return buf;
}
-
- return recurser(buf, size, st.st_dev, st.st_ino);
+ if (buf == NULL)
+ free (path);
+ return NULL;
}
-#endif