sbase

suckless unix tools
git clone git://git.suckless.org/sbase
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whoami.c (582B)

      1 /* See LICENSE file for copyright and license details. */
      2 #include <errno.h>
      3 #include <stdio.h>
      4 #include <unistd.h>
      5 #include <pwd.h>
      6 
      7 #include "util.h"
      8 
      9 static void
     10 usage(void)
     11 {
     12 	eprintf("usage: %s\n", argv0);
     13 }
     14 
     15 int
     16 main(int argc, char *argv[])
     17 {
     18 	uid_t uid;
     19 	struct passwd *pw;
     20 
     21 	argv0 = *argv, argv0 ? (argc--, argv++) : (void *)0;
     22 
     23 	if (argc)
     24 		usage();
     25 
     26 	uid = geteuid();
     27 	errno = 0;
     28 	if (!(pw = getpwuid(uid))) {
     29 		if (errno)
     30 			eprintf("getpwuid %d:", uid);
     31 		else
     32 			eprintf("getpwuid %d: no such user\n", uid);
     33 	}
     34 	puts(pw->pw_name);
     35 
     36 	return fshut(stdout, "<stdout>");
     37 }