diplodocus.org Git - nmh/blob - docs/historical/mh-nov-1983/subs/getans.c

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