client/birdcl.c

   1 /*
   2  *      BIRD Client - Light variant I/O
   3  *
   4  *      (c) 1999--2004 Martin Mares <mj@ucw.cz>
   5  *      (c) 2013 Tomas Hlavacek <tomas.hlavacek@nic.cz>
   6  *
   7  *      Can be freely distributed and used under the terms of the GNU GPL.
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <termios.h>
  14 #include <errno.h>
  15
  16 #include <sys/ioctl.h>
  17 #include <signal.h>
  18
  19 #include "nest/bird.h"
  20 #include "lib/resource.h"
  21 #include "lib/string.h"
  22 #include "client/client.h"
  23 #include "sysdep/unix/unix.h"
  24
  25 #define INPUT_BUF_LEN 2048
  26
  27 struct termios tty_save;
  28
  29 void
  30 input_start_list(void)
  31 {
  32   /* Empty in non-ncurses version. */
  33 }
  34
  35 void
  36 input_stop_list(void)
  37 {
  38   /* Empty in non-ncurses version. */
  39 }
  40
  41 void
  42 input_notify(int prompt)
  43 {
  44   /* No ncurses -> no status to reveal/hide, print prompt manually. */
  45   if (!prompt)
  46     return;
  47
  48   printf("bird> ");
  49   fflush(stdout);
  50 }
  51
  52
  53 static int
  54 lastnb(char *str, int i)
  55 {
  56   while (i--)
  57     if ((str[i] != ' ') && (str[i] != '\t'))
  58       return str[i];
  59
  60   return 0;
  61 }
  62
  63 void
  64 input_read(void)
  65 {
  66   char buf[INPUT_BUF_LEN];
  67
  68   if ((fgets(buf, INPUT_BUF_LEN, stdin) == NULL) || (buf[0] == 0))
  69   {
  70     putchar('\n');
  71     cleanup();
  72     exit(0);
  73   }
  74
  75   int l = strlen(buf);
  76   if ((l+1) == INPUT_BUF_LEN)
  77     {
  78       printf("Input too long.\n");
  79       return;
  80     }
  81
  82   if (buf[l-1] == '\n')
  83     buf[--l] = '\0';
  84
  85   if (!interactive)
  86     printf("%s\n", buf);
  87
  88   if (l == 0)
  89     return;
  90
  91   if (lastnb(buf, l) == '?')
  92     {
  93       cmd_help(buf, strlen(buf));
  94       return;
  95     }
  96
  97   submit_command(buf);
  98 }
  99
 100 static struct termios stored_tty;
 101 static int more_active = 0;
 102
 103 void
 104 more_begin(void)
 105 {
 106   static struct termios tty;
 107
 108   tty = stored_tty;
 109   tty.c_lflag &= (~ECHO);
 110   tty.c_lflag &= (~ICANON);
 111
 112   if (tcsetattr (0, TCSANOW, &tty) < 0)
 113     DIE("tcsetattr");
 114
 115   more_active = 1;
 116 }
 117
 118 void
 119 more_end(void)
 120 {
 121   more_active = 0;
 122
 123   if (tcsetattr (0, TCSANOW, &stored_tty) < 0)
 124     DIE("tcsetattr");
 125 }
 126
 127 static void
 128 sig_handler(int signal)
 129 {
 130   cleanup();
 131   exit(0);
 132 }
 133
 134 void
 135 input_init(void)
 136 {
 137   if (!interactive)
 138     return;
 139
 140   if (tcgetattr(0, &stored_tty) < 0)
 141     DIE("tcgetattr");
 142
 143   if (signal(SIGINT, sig_handler) == SIG_IGN)
 144     signal(SIGINT, SIG_IGN);
 145   if (signal(SIGTERM, sig_handler) == SIG_IGN)
 146     signal(SIGTERM, SIG_IGN);
 147
 148   struct winsize tws;
 149   if (ioctl(0, TIOCGWINSZ, &tws) == 0)
 150     {
 151       term_lns = tws.ws_row;
 152       term_cls = tws.ws_col;
 153     }
 154 }
 155
 156 void
 157 cleanup(void)
 158 {
 159   if (more_active)
 160     more_end();
 161 }