#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;
}