X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Funistd%2Fgetcwd.c;h=f407ffe07ed6008fa4af1ce020b60df0a26a7534;hb=595416b11dfbc82d40a59d0edd7e3b04ba7a2d6d;hp=2e540cd41daef91efd37c7656f8f9274d4447ed6;hpb=899b13cae77469a9ed1f076c456b66d567af69d8;p=musl

diff --git a/src/unistd/getcwd.c b/src/unistd/getcwd.c
index 2e540cd4..f407ffe0 100644
--- a/src/unistd/getcwd.c
+++ b/src/unistd/getcwd.c
@@ -6,8 +6,20 @@
 
 char *getcwd(char *buf, size_t size)
 {
-	char tmp[PATH_MAX];
-	if (!buf) buf = tmp, size = PATH_MAX;
-	if (syscall(SYS_getcwd, buf, size) < 0) return 0;
+	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;
 }