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-rw-r--r--libc/sysdeps/linux/common/getcwd.c39
1 files changed, 21 insertions, 18 deletions
diff --git a/libc/sysdeps/linux/common/getcwd.c b/libc/sysdeps/linux/common/getcwd.c
index 9e64a3dd8..d1740fa31 100644
--- a/libc/sysdeps/linux/common/getcwd.c
+++ b/libc/sysdeps/linux/common/getcwd.c
@@ -151,29 +151,32 @@ static char *recurser(char *path_buf, int path_size, dev_t root_dev, ino_t root_
char *getcwd(char *buf, int size)
{
- struct stat st;
+ struct stat st;
- if (size == 0) {
- __set_errno(EINVAL);
- return NULL;
- }
- if (size < 3) {
- __set_errno(ERANGE);
- return NULL;
+ if (size == 0) {
+ if (buf != NULL) {
+ __set_errno(EINVAL);
+ return NULL;
}
+ size = PATH_MAX;
+ }
+ if (size < 3) {
+ __set_errno(ERANGE);
+ return NULL;
+ }
- if (buf == NULL) {
- buf = malloc (size);
- if (buf == NULL)
- return NULL;
- }
+ if (buf == NULL) {
+ buf = malloc (size);
+ if (buf == NULL)
+ return NULL;
+ }
- strcpy(buf, ".");
- if (stat("/", &st) < 0) {
- return NULL;
- }
+ strcpy(buf, ".");
+ if (stat("/", &st) < 0) {
+ return NULL;
+ }
- return recurser(buf, size, st.st_dev, st.st_ino);
+ return recurser(buf, size, st.st_dev, st.st_ino);
}
#endif