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

   1 /*
   2  * getfullname.c - Extract a user's name out of the GECOS field in
   3  *                 the password file.
   4  *
   5  * This code is Copyright (c) 2012, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <unistd.h>
  14 #include <sys/types.h>
  15 #include <pwd.h>
  16
  17 int
  18 main(int argc, char *argv[])
  19 {
  20         struct passwd *pwd;
  21         char name[BUFSIZ], *p;
  22
  23         if (argc > 1) {
  24                 fprintf (stderr, "usage: %s\n", argv[0]);
  25         }
  26
  27         pwd = getpwuid(getuid());
  28
  29         if (! pwd) {
  30                 fprintf(stderr, "Unable to retrieve user info for "
  31                         "userid %ld\n", (long) getuid());
  32                 exit(1);
  33         }
  34
  35         /*
  36          * Perform the same processing that getuserinfo() does.
  37          */
  38
  39         strncpy(name, pwd->pw_gecos, sizeof(name));
  40
  41         name[sizeof(name) - 1] = '\0';
  42
  43         /*
  44          * Stop at the first comma
  45          */
  46
  47         if ((p = strchr(name, ',')))
  48                 *p = '\0';
  49
  50         /*
  51          * Quote the entire string if it has a "." in it
  52          */
  53
  54         if (strchr(name, '.')) {
  55                 char tmp[BUFSIZ];
  56
  57                 snprintf(tmp, sizeof(tmp), "\"%s\"", name);
  58                 strncpy(name, tmp, sizeof(name));
  59
  60                 name[sizeof(name) - 2] = '"';
  61                 name[sizeof(name) - 1] = '\0';
  62         }
  63
  64         printf("%s\n", name);
  65
  66         exit(0);
  67 }