diplodocus.org Git - nmh/blob - sbr/read_switch.c

   1
   2 /*
   3  * read_switch.c -- prompt the user for an answer from the list
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #include <h/mh.h>
  11
  12
  13 int
  14 read_switch (const char *prompt, const struct swit *ansp)
  15 {
  16     int i;
  17     char *cp;
  18     const struct swit *ap;
  19     char ansbuf[BUFSIZ];
  20
  21     for (;;) {
  22         fputs(prompt, stdout);
  23         fflush (stdout);
  24         cp = ansbuf;
  25         while ((i = getchar ()) != '\n') {
  26             if (i == EOF)
  27                 return 0;
  28             if (cp < &ansbuf[sizeof ansbuf - 1]) {
  29                 i = tolower(i);
  30                 *cp++ = i;
  31             }
  32         }
  33         *cp = '\0';
  34         if (ansbuf[0] == '?' || cp == ansbuf) {
  35             puts("Options are:");
  36             for (ap = ansp; ap->sw; ap++)
  37                 printf ("  %s\n", ap->sw);
  38             continue;
  39         }
  40         if ((i = smatch (ansbuf, ansp)) < 0) {
  41             printf ("%s: %s.\n", ansbuf, i == -1 ? "unknown" : "ambiguous");
  42             continue;
  43         }
  44         return i;
  45     }
  46 }