about summary refs log tree commit diff
path: root/src
diff options
context:
space:
mode:
authorRich Felker <dalias@aerifal.cx>2021-02-13 14:03:23 -0500
committerRich Felker <dalias@aerifal.cx>2021-02-13 14:03:23 -0500
commit49b6df3d9f3645de55607f1ac60095b22661b334 (patch)
tree451dacd908751632afc68b3f68320e9004bbc008 /src
parentcc577d0e058b53df5c0fe2ac17890a41d77e94c5 (diff)
downloadmusl-49b6df3d9f3645de55607f1ac60095b22661b334.tar.gz
musl-49b6df3d9f3645de55607f1ac60095b22661b334.tar.xz
musl-49b6df3d9f3645de55607f1ac60095b22661b334.zip
fix error return value for cuserid
the historical function was specified to return an empty string in the
caller-provided buffer, not a null pointer, to indicate error when the
argument is non-null. only when the argument is null should it return
a null pointer on error.
Diffstat (limited to 'src')
-rw-r--r--src/legacy/cuserid.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/legacy/cuserid.c b/src/legacy/cuserid.c
index 07866acf..dcaf73d4 100644
--- a/src/legacy/cuserid.c
+++ b/src/legacy/cuserid.c
@@ -9,12 +9,13 @@ char *cuserid(char *buf)
 	static char usridbuf[L_cuserid];
 	struct passwd pw, *ppw;
 	long pwb[256];
+	if (buf) *buf = 0;
 	getpwuid_r(geteuid(), &pw, (void *)pwb, sizeof pwb, &ppw);
 	if (!ppw)
-		return 0;
+		return buf;
 	size_t len = strnlen(pw.pw_name, L_cuserid);
 	if (len == L_cuserid)
-		return 0;
+		return buf;
 	if (!buf) buf = usridbuf;
 	memcpy(buf, pw.pw_name, len+1);
 	return buf;