libbb/login.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * issue.c: issue printing code
   4  *
   5  * Copyright (C) 2003 Bastian Blank <waldi@tuxbox.org>
   6  *
   7  * Optimize and correcting OCRNL by Vladimir Oleynik <dzo@simtreas.ru>
   8  *
   9  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  10  */
  11
  12 #include <sys/param.h>  /* MAXHOSTNAMELEN */
  13 #include <sys/utsname.h>
  14 #include "libbb.h"
  15
  16 #define LOGIN " login: "
  17
  18 static const char fmtstr_d[] = "%A, %d %B %Y";
  19 static const char fmtstr_t[] = "%H:%M:%S";
  20
  21 void print_login_issue(const char *issue_file, const char *tty)
  22 {
  23         FILE *fd;
  24         int c;
  25         char buf[256+1];
  26         const char *outbuf;
  27         time_t t;
  28         struct utsname uts;
  29
  30         time(&t);
  31         uname(&uts);
  32
  33         puts("\r");     /* start a new line */
  34
  35         fd = fopen(issue_file, "r");
  36         if (!fd)
  37                 return;
  38         while ((c = fgetc(fd)) != EOF) {
  39                 outbuf = buf;
  40                 buf[0] = c;
  41                 buf[1] = '\0';
  42                 if (c == '\n') {
  43                         buf[1] = '\r';
  44                         buf[2] = '\0';
  45                 }
  46                 if (c == '\\' || c == '%') {
  47                         c = fgetc(fd);
  48                         switch (c) {
  49                         case 's':
  50                                 outbuf = uts.sysname;
  51                                 break;
  52                         case 'n':
  53                                 outbuf = uts.nodename;
  54                                 break;
  55                         case 'r':
  56                                 outbuf = uts.release;
  57                                 break;
  58                         case 'v':
  59                                 outbuf = uts.version;
  60                                 break;
  61                         case 'm':
  62                                 outbuf = uts.machine;
  63                                 break;
  64                         case 'D':
  65                         case 'o':
  66                                 c = getdomainname(buf, sizeof(buf) - 1);
  67                                 buf[c >= 0 ? c : 0] = '\0';
  68                                 break;
  69                         case 'd':
  70                                 strftime(buf, sizeof(buf), fmtstr_d, localtime(&t));
  71                                 break;
  72                         case 't':
  73                                 strftime(buf, sizeof(buf), fmtstr_t, localtime(&t));
  74                                 break;
  75                         case 'h':
  76                                 gethostname(buf, sizeof(buf) - 1);
  77                                 buf[sizeof(buf) - 1] = '\0';
  78                                 break;
  79                         case 'l':
  80                                 outbuf = tty;
  81                                 break;
  82                         default:
  83                                 buf[0] = c;
  84                         }
  85                 }
  86                 fputs(outbuf, stdout);
  87         }
  88         fclose(fd);
  89         fflush(stdout);
  90 }
  91
  92 void print_login_prompt(void)
  93 {
  94         char buf[MAXHOSTNAMELEN+1];
  95
  96         if (gethostname(buf, MAXHOSTNAMELEN) == 0)
  97                 fputs(buf, stdout);
  98
  99         fputs(LOGIN, stdout);
 100         fflush(stdout);
 101 }