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#define _GNU_SOURCE
#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 (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;
memcpy(buf, pw.pw_name, len+1);
return buf;
}
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