diplodocus.org Git - nmh/blob - docs/historical/mh-jun-1982/subs/getans.c

   1 #ifdef COMMENT
   2         Proprietary Rand Corporation, 1981.
   3         Further distribution of this software
   4         subject to the terms of the Rand
   5         license agreement.
   6 #endif
   7
   8 #include "../mh.h"
   9 #include <signal.h>
  10 #include <stdio.h>
  11
  12 int g_sigint;   /* sensed an interrupt */
  13 int g_sig();
  14
  15 char **
  16 getans(prompt, ansp)
  17         char *prompt;
  18         struct swit *ansp;
  19 {
  20         static char ansbuf[128];
  21         register char *cp, **cpp;
  22         register int i;
  23
  24         VOID signal(SIGINT, g_sig);
  25         for(;;) {
  26                 printf("%s", prompt);
  27                 VOID fflush(stdout);
  28                 cp = ansbuf;
  29                 while((i = getchar()) != '\n') {
  30                         if(i == EOF || g_sigint)  {
  31                                 g_sigint = 0;
  32                                 return(0);
  33                         }
  34                         if(cp < &ansbuf[127])
  35                                 *cp++ = i;
  36                 }
  37                 *cp = 0;
  38                 if(ansbuf[0] == '?' || cp == ansbuf) {
  39                         printf("Options are:\n");
  40                         printsw(ALL, ansp, "");
  41                         continue;
  42                 }
  43                 cpp = brkstring(ansbuf, " ", NULLCP);
  44                 switch(smatch(*cpp, ansp)) {
  45                 case -2:ambigsw(*cpp, ansp);                   /* ambiguous */
  46                         continue;
  47                 case -1:                                       /* unknown   */
  48                         printf(" -%s unknown. Hit <CR> for help.\n", *cpp);
  49                         continue;
  50                 default:
  51                         return(cpp);            /* list, edit, quit, send */
  52                 }
  53         }
  54 }
  55
  56
  57 g_sig()
  58 {
  59         VOID signal(SIGINT, g_sig);
  60         g_sigint = 1;
  61         return;
  62 }