X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Flegacy%2Fcuserid.c;h=dcaf73d4e64882e857fa3f1ef5192af0e4bf6b16;hb=760f5d7efed4d4761875334f8c4e6398be308cc9;hp=fd7832e41fdf15509a80583e8f7bb10473e53356;hpb=ef137da6428c342baabd3bcf9b5e91f75acefa64;p=musl

diff --git a/src/legacy/cuserid.c b/src/legacy/cuserid.c
index fd7832e4..dcaf73d4 100644
--- a/src/legacy/cuserid.c
+++ b/src/legacy/cuserid.c
@@ -2,15 +2,21 @@
 #include <pwd.h>
 #include <stdio.h>
 #include <unistd.h>
+#include <string.h>
 
 char *cuserid(char *buf)
 {
 	static char usridbuf[L_cuserid];
 	struct passwd pw, *ppw;
 	long pwb[256];
-	if (getpwuid_r(geteuid(), &pw, (void *)pwb, sizeof pwb, &ppw))
-		return 0;
+	if (buf) *buf = 0;
+	getpwuid_r(geteuid(), &pw, (void *)pwb, sizeof pwb, &ppw);
+	if (!ppw)
+		return buf;
+	size_t len = strnlen(pw.pw_name, L_cuserid);
+	if (len == L_cuserid)
+		return buf;
 	if (!buf) buf = usridbuf;
-	snprintf(buf, L_cuserid, "%s", pw.pw_name);
+	memcpy(buf, pw.pw_name, len+1);
 	return buf;
 }