diplodocus.org Git - nmh/blob - docs/historical/mh-6.8.5/sbr/getans.c

   1 /* getans.c - get an answer from the user and return a string array */
   2 #ifndef lint
   3 static char ident[] = "@(#)$Id: getans.c,v 1.8 1992/12/15 00:20:22 jromine Exp $";
   4 #endif  /* lint */
   5
   6 #include "../h/mh.h"
   7 #ifdef  BSD42
   8 #include <setjmp.h>
   9 #endif  /* BSD42 */
  10 #include <signal.h>
  11 #include <stdio.h>
  12
  13
  14 static  char ansbuf[BUFSIZ];
  15 #ifndef BSD42
  16 static  int interrupted;
  17 #else   /* BSD42 */
  18 static  jmp_buf sigenv;
  19 #endif  /* BSD42 */
  20 static TYPESIG  intrser ();
  21
  22 char  **getans (prompt, ansp)
  23 char   *prompt;
  24 struct swit   *ansp;
  25 {
  26     int    i;
  27     TYPESIG    (*istat) ();
  28     char  *cp,
  29          **cpp;
  30
  31 #ifndef BSD42
  32     interrupted = 0;
  33     istat = signal (SIGINT, intrser);
  34 #else   /* BSD42 */
  35     switch (setjmp (sigenv)) {
  36         case OK:
  37             istat = signal (SIGINT, intrser);
  38             break;
  39
  40         default:
  41             (void) signal (SIGINT, istat);
  42             return NULL;
  43     }
  44 #endif  /* BSD42 */
  45     for (;;) {
  46         printf ("%s", prompt);
  47         (void) fflush (stdout);
  48         cp = ansbuf;
  49         while ((i = getchar ()) != '\n') {
  50 #ifndef BSD42
  51             if (i == EOF || interrupted) {
  52                 interrupted = 0;
  53                 (void) signal (SIGINT, istat);
  54                 return NULL;
  55             }
  56 #else   /* BSD42 */
  57             if (i == EOF)
  58                 longjmp (sigenv, DONE);
  59 #endif  /* BSD42 */
  60             if (cp < &ansbuf[sizeof ansbuf - 1])
  61                 *cp++ = i;
  62         }
  63         *cp = 0;
  64         if (ansbuf[0] == '?' || cp == ansbuf) {
  65             printf ("Options are:\n");
  66             printsw (ALL, ansp, "");
  67             continue;
  68         }
  69         cpp = brkstring (ansbuf, " ", NULLCP);
  70         switch (smatch (*cpp, ansp)) {
  71             case AMBIGSW:
  72                 ambigsw (*cpp, ansp);
  73                 continue;
  74             case UNKWNSW:
  75                 printf (" -%s unknown. Hit <CR> for help.\n", *cpp);
  76                 continue;
  77             default:
  78                 (void) signal (SIGINT, istat);
  79                 return cpp;
  80         }
  81     }
  82 }
  83
  84
  85 static  TYPESIG intrser (i)
  86 int     i;
  87 {
  88 #ifndef BSD42
  89         (void) signal(SIGINT, intrser);
  90         interrupted = 1;
  91 #else   /* BSD42 */
  92         longjmp (sigenv, NOTOK);
  93 #endif  /* BSD42 */
  94 }