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#define _GNU_SOURCE
#include <pwd.h>
#include <stdio.h>
#include <unistd.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 = usridbuf;
snprintf(buf, L_cuserid, "%s", pw.pw_name);
return buf;
}
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