diplodocus.org Git - nmh/blob - test/getfullname.c

   1 /* getfullname.c - Extract a user's name out of the GECOS field in
   2  *                 the password file.
   3  *
   4  * This code is Copyright (c) 2012, by the authors of nmh.  See the
   5  * COPYRIGHT file in the root directory of the nmh distribution for
   6  * complete copyright information.
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include <sys/types.h>
  14 #include <pwd.h>
  15
  16 extern void escape_display_name (char *, size_t);
  17
  18 int
  19 main(int argc, char *argv[])
  20 {
  21         struct passwd *pwd;
  22         char buf[BUFSIZ], *p;
  23
  24         if (argc > 2) {
  25                 fprintf (stderr, "usage: %s [name]\n", argv[0]);
  26                 return 1;
  27         }
  28         if (argc < 2) {
  29                 pwd = getpwuid(getuid());
  30                 if (! pwd) {
  31                         fprintf(stderr, "Unable to retrieve user info for "
  32                                 "userid %ld\n", (long) getuid());
  33                         exit(1);
  34                 }
  35
  36                 strncpy(buf, pwd->pw_gecos, sizeof(buf));
  37                 buf[sizeof(buf) - 1] = '\0';
  38         } else
  39                 strncpy(buf, argv[1], sizeof(buf));
  40
  41         /*
  42          * Perform the same processing that getuserinfo() does.
  43          */
  44
  45         /*
  46          * Stop at the first comma.
  47          */
  48         if ((p = strchr(buf, ',')))
  49                 *p = '\0';
  50
  51         /*
  52          * Quote the entire string if it has a special character in it.
  53          */
  54         escape_display_name (buf, sizeof(buf));
  55         puts(buf);
  56
  57         exit(0);
  58 }