X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Funistd%2Fgetcwd.c;h=f407ffe07ed6008fa4af1ce020b60df0a26a7534;hb=4554f155dd23a65fcdfd39f1d5af8af55ba37694;hp=b64b560feeb5bf71d24f2354721a7b39d1f85004;hpb=aa398f56fa398f2202b04e82c67f822f3233786f;p=musl

diff --git a/src/unistd/getcwd.c b/src/unistd/getcwd.c
index b64b560f..f407ffe0 100644
--- a/src/unistd/getcwd.c
+++ b/src/unistd/getcwd.c
@@ -1,8 +1,25 @@
 #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[buf ? 1 : PATH_MAX];
+	if (!buf) {
+		buf = tmp;
+		size = sizeof tmp;
+	} else if (!size) {
+		errno = EINVAL;
+		return 0;
+	}
+	long ret = syscall(SYS_getcwd, buf, size);
+	if (ret < 0)
+		return 0;
+	if (ret == 0 || buf[0] != '/') {
+		errno = ENOENT;
+		return 0;
+	}
+	return buf == tmp ? strdup(buf) : buf;
 }