games/pig/pig.c

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1992, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)pig.c    8.2 (Berkeley) 5/4/95
  31  * $FreeBSD: src/games/pig/pig.c,v 1.7 1999/11/30 03:49:08 billf Exp $
  32  */
  33
  34 #include <sys/types.h>
  35
  36 #include <ctype.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41
  42 void pigout (char *, int);
  43 void usage (void);
  44
  45 int
  46 main(int argc, char **argv)
  47 {
  48         int len;
  49         int ch;
  50         char buf[1024];
  51
  52         while ((ch = getopt(argc, argv, "")) != -1)
  53                 switch(ch) {
  54                 case '?':
  55                 default:
  56                         usage();
  57                 }
  58         argc -= optind;
  59         argv += optind;
  60
  61         for (len = 0; (ch = getchar()) != EOF;) {
  62                 if (isalpha(ch)) {
  63                         if (len >= (int)sizeof(buf)) {
  64                                 (void)fprintf(stderr, "pig: ate too much!\n");
  65                                 exit(1);
  66                         }
  67                         buf[len++] = ch;
  68                         continue;
  69                 }
  70                 if (len != 0) {
  71                         pigout(buf, len);
  72                         len = 0;
  73                 }
  74                 (void)putchar(ch);
  75         }
  76         exit(0);
  77 }
  78
  79 void
  80 pigout(char *buf, int len)
  81 {
  82         int ch, start;
  83         int olen;
  84
  85         /*
  86          * If the word starts with a vowel, append "way".  Don't treat 'y'
  87          * as a vowel if it appears first.
  88          */
  89         if (index("aeiouAEIOU", buf[0]) != NULL) {
  90                 (void)printf("%.*sway", len, buf);
  91                 return;
  92         }
  93
  94         /*
  95          * Copy leading consonants to the end of the word.  The unit "qu"
  96          * isn't treated as a vowel.
  97          */
  98         for (start = 0, olen = len;
  99             start < olen && !index("aeiouyAEIOUY", buf[start]);) {
 100                 ch = buf[len++] = buf[start++];
 101                 if ((ch == 'q' || ch == 'Q') && start < olen &&
 102                     (buf[start] == 'u' || buf[start] == 'U'))
 103                         buf[len++] = buf[start++];
 104         }
 105         (void)printf("%.*say", olen, buf + start);
 106 }
 107
 108 void
 109 usage(void)
 110 {
 111         (void)fprintf(stderr, "usage: pig\n");
 112         exit(1);
 113 }