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 #include <unistd.h>
  14
  15 static char ansbuf[BUFSIZ];
  16 static jmp_buf sigenv;
  17
  18 /*
  19 ** static prototypes
  20 */
  21 static void intrser(int);
  22
  23
  24 char **
  25 getans(char *prompt, struct swit *ansp)
  26 {
  27         int i;
  28         SIGNAL_HANDLER istat = NULL;
  29         char *cp, **cpp;
  30
  31         if (!(setjmp(sigenv))) {
  32                 istat = SIGNAL(SIGINT, intrser);
  33         } else {
  34                 SIGNAL(SIGINT, istat);
  35                 return NULL;
  36         }
  37
  38         for (;;) {
  39                 printf("%s", prompt);
  40                 fflush(stdout);
  41                 cp = ansbuf;
  42                 while ((i = getchar()) != '\n') {
  43                         if (i == EOF)
  44                                 longjmp(sigenv, 1);
  45                         if (cp < &ansbuf[sizeof ansbuf - 1])
  46                                 *cp++ = i;
  47                 }
  48                 *cp = '\0';
  49                 if (ansbuf[0] == '?' || cp == ansbuf) {
  50                         printf("Options are:\n");
  51                         print_sw(ALL, ansp, "", stdout);
  52                         continue;
  53                 }
  54                 cpp = brkstring(ansbuf, " ", NULL);
  55                 switch (smatch(*cpp, ansp)) {
  56                 case AMBIGSW:
  57                         ambigsw(*cpp, ansp);
  58                         continue;
  59                 case UNKWNSW:
  60                         printf(" -%s unknown. Hit <CR> for help.\n", *cpp);
  61                         continue;
  62                 default:
  63                         SIGNAL(SIGINT, istat);
  64                         return cpp;
  65                 }
  66         }
  67 }
  68
  69
  70 static void
  71 intrser(int i)
  72 {
  73         /*
  74         ** should this be siglongjmp?
  75         */
  76         close(STDIN_FILENO);
  77 }