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  * $DragonFly: src/games/pig/pig.c,v 1.4 2005/04/25 16:10:24 liamfoy Exp $
  33  */
  34
  35 #include <sys/types.h>
  36
  37 #include <ctype.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42
  43 void pigout (char *, int);
  44 void usage (void);
  45
  46 int
  47 main(int argc, char **argv)
  48 {
  49         int len;
  50         int ch;
  51         char buf[1024];
  52
  53         while ((ch = getopt(argc, argv, "")) != -1)
  54                 switch(ch) {
  55                 case '?':
  56                 default:
  57                         usage();
  58                 }
  59         argc -= optind;
  60         argv += optind;
  61
  62         for (len = 0; (ch = getchar()) != EOF;) {
  63                 if (isalpha(ch)) {
  64                         if (len >= (int)sizeof(buf)) {
  65                                 (void)fprintf(stderr, "pig: ate too much!\n");
  66                                 exit(1);
  67                         }
  68                         buf[len++] = ch;
  69                         continue;
  70                 }
  71                 if (len != 0) {
  72                         pigout(buf, len);
  73                         len = 0;
  74                 }
  75                 (void)putchar(ch);
  76         }
  77         exit(0);
  78 }
  79
  80 void
  81 pigout(char *buf, int len)
  82 {
  83         int ch, start;
  84         int olen;
  85
  86         /*
  87          * If the word starts with a vowel, append "way".  Don't treat 'y'
  88          * as a vowel if it appears first.
  89          */
  90         if (index("aeiouAEIOU", buf[0]) != NULL) {
  91                 (void)printf("%.*sway", len, buf);
  92                 return;
  93         }
  94
  95         /*
  96          * Copy leading consonants to the end of the word.  The unit "qu"
  97          * isn't treated as a vowel.
  98          */
  99         for (start = 0, olen = len;
 100             !index("aeiouyAEIOUY", buf[start]) && start < olen;) {
 101                 ch = buf[len++] = buf[start++];
 102                 if ((ch == 'q' || ch == 'Q') && start < olen &&
 103                     (buf[start] == 'u' || buf[start] == 'U'))
 104                         buf[len++] = buf[start++];
 105         }
 106         (void)printf("%.*say", olen, buf + start);
 107 }
 108
 109 void
 110 usage(void)
 111 {
 112         (void)fprintf(stderr, "usage: pig\n");
 113         exit(1);
 114 }