src/legacy/cuserid.c

   1 #define _GNU_SOURCE
   2 #include <pwd.h>
   3 #include <stdio.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6
   7 char *cuserid(char *buf)
   8 {
   9         static char usridbuf[L_cuserid];
  10         struct passwd pw, *ppw;
  11         long pwb[256];
  12         if (buf) *buf = 0;
  13         getpwuid_r(geteuid(), &pw, (void *)pwb, sizeof pwb, &ppw);
  14         if (!ppw)
  15                 return buf;
  16         size_t len = strnlen(pw.pw_name, L_cuserid);
  17         if (len == L_cuserid)
  18                 return buf;
  19         if (!buf) buf = usridbuf;
  20         memcpy(buf, pw.pw_name, len+1);
  21         return buf;
  22 }