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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1992, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)pig.c    8.2 (Berkeley) 5/4/95
  35  * $FreeBSD: src/games/pig/pig.c,v 1.7 1999/11/30 03:49:08 billf Exp $
  36  * $DragonFly: src/games/pig/pig.c,v 1.4 2005/04/25 16:10:24 liamfoy Exp $
  37  */
  38
  39 #include <sys/types.h>
  40
  41 #include <ctype.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46
  47 void pigout (char *, int);
  48 void usage (void);
  49
  50 int
  51 main(int argc, char **argv)
  52 {
  53         int len;
  54         int ch;
  55         char buf[1024];
  56
  57         while ((ch = getopt(argc, argv, "")) != -1)
  58                 switch(ch) {
  59                 case '?':
  60                 default:
  61                         usage();
  62                 }
  63         argc -= optind;
  64         argv += optind;
  65
  66         for (len = 0; (ch = getchar()) != EOF;) {
  67                 if (isalpha(ch)) {
  68                         if (len >= (int)sizeof(buf)) {
  69                                 (void)fprintf(stderr, "pig: ate too much!\n");
  70                                 exit(1);
  71                         }
  72                         buf[len++] = ch;
  73                         continue;
  74                 }
  75                 if (len != 0) {
  76                         pigout(buf, len);
  77                         len = 0;
  78                 }
  79                 (void)putchar(ch);
  80         }
  81         exit(0);
  82 }
  83
  84 void
  85 pigout(char *buf, int len)
  86 {
  87         int ch, start;
  88         int olen;
  89
  90         /*
  91          * If the word starts with a vowel, append "way".  Don't treat 'y'
  92          * as a vowel if it appears first.
  93          */
  94         if (index("aeiouAEIOU", buf[0]) != NULL) {
  95                 (void)printf("%.*sway", len, buf);
  96                 return;
  97         }
  98
  99         /*
 100          * Copy leading consonants to the end of the word.  The unit "qu"
 101          * isn't treated as a vowel.
 102          */
 103         for (start = 0, olen = len;
 104             !index("aeiouyAEIOUY", buf[start]) && start < olen;) {
 105                 ch = buf[len++] = buf[start++];
 106                 if ((ch == 'q' || ch == 'Q') && start < olen &&
 107                     (buf[start] == 'u' || buf[start] == 'U'))
 108                         buf[len++] = buf[start++];
 109         }
 110         (void)printf("%.*say", olen, buf + start);
 111 }
 112
 113 void
 114 usage(void)
 115 {
 116         (void)fprintf(stderr, "usage: pig\n");
 117         exit(1);
 118 }