git.marmaro.de Git - mmh/blob - sbr/getans.c

   1 /*
   2 ** getans.c -- get an answer from the user and return a string array
   3 **
   4 ** This code is Copyright (c) 2002, by the authors of nmh.  See the
   5 ** COPYRIGHT file in the root directory of the nmh distribution for
   6 ** complete copyright information.
   7 */
   8
   9 #include <h/mh.h>
  10 #include <h/signals.h>
  11 #include <setjmp.h>
  12 #include <signal.h>
  13
  14 static char ansbuf[BUFSIZ];
  15 static jmp_buf sigenv;
  16
  17 /*
  18 ** static prototypes
  19 */
  20 static RETSIGTYPE intrser(int);
  21
  22
  23 char **
  24 getans(char *prompt, struct swit *ansp)
  25 {
  26         int i;
  27         SIGNAL_HANDLER istat = NULL;
  28         char *cp, **cpp;
  29
  30         if (!(setjmp(sigenv))) {
  31                 istat = SIGNAL(SIGINT, intrser);
  32         } else {
  33                 SIGNAL(SIGINT, istat);
  34                 return NULL;
  35         }
  36
  37         for (;;) {
  38                 printf("%s", prompt);
  39                 fflush(stdout);
  40                 cp = ansbuf;
  41                 while ((i = getchar()) != '\n') {
  42                         if (i == EOF)
  43                                 longjmp(sigenv, 1);
  44                         if (cp < &ansbuf[sizeof ansbuf - 1])
  45                                 *cp++ = i;
  46                 }
  47                 *cp = '\0';
  48                 if (ansbuf[0] == '?' || cp == ansbuf) {
  49                         printf("Options are:\n");
  50                         print_sw(ALL, ansp, "", stdout);
  51                         continue;
  52                 }
  53                 cpp = brkstring(ansbuf, " ", NULL);
  54                 switch (smatch(*cpp, ansp)) {
  55                 case AMBIGSW:
  56                         ambigsw(*cpp, ansp);
  57                         continue;
  58                 case UNKWNSW:
  59                         printf(" -%s unknown. Hit <CR> for help.\n", *cpp);
  60                         continue;
  61                 default:
  62                         SIGNAL(SIGINT, istat);
  63                         return cpp;
  64                 }
  65         }
  66 }
  67
  68
  69 static RETSIGTYPE
  70 intrser(int i)
  71 {
  72         /*
  73         ** should this be siglongjmp?
  74         */
  75         longjmp(sigenv, 1);
  76 }