remove another invalid skip of locking in ungetwc

[oweals/musl.git] / src / unistd / getcwd.c

diff --git a/src/unistd/getcwd.c b/src/unistd/getcwd.c
index b64b560feeb5bf71d24f2354721a7b39d1f85004..a7b925d2dbee5a99f5ec61b77b5870ae3a839143 100644 (file)
--- a/src/unistd/getcwd.c
+++ b/src/unistd/getcwd.c
@@ -1,8 +1,19 @@
 #include <unistd.h>
 #include <errno.h>
+#include <limits.h>
+#include <string.h>
 #include "syscall.h"
 
 char *getcwd(char *buf, size_t size)
 {
-       return syscall(SYS_getcwd, buf, size) < 0 ? NULL : buf;
+       char tmp[PATH_MAX];
+       if (!buf) {
+               buf = tmp;
+               size = PATH_MAX;
+       } else if (!size) {
+               errno = EINVAL;
+               return 0;
+       }
+       if (syscall(SYS_getcwd, buf, size) < 0) return 0;
+       return buf == tmp ? strdup(buf) : buf;
 }