/*      $NetBSD: tr.c,v 1.20 2013/08/11 01:54:35 dholland Exp $ */

/*
* Copyright (c) 1988, 1993
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1988, 1993\
The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)tr.c        8.2 (Berkeley) 5/4/95";
#endif
__RCSID("$NetBSD: tr.c,v 1.20 2013/08/11 01:54:35 dholland Exp $");
#endif /* not lint */

#include <sys/types.h>

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "extern.h"

static int string1[NCHARS], string2[NCHARS];

static void setup(int *, const char *, int, int);
__dead static void usage(void);

int
main(int argc, char **argv)
{
       int ch, ch2, lastch;
       int cflag, dflag, sflag, isstring2;
       STR *s1, *s2;

       cflag = dflag = sflag = 0;
       while ((ch = getopt(argc, argv, "cds")) != -1)
               switch (ch) {
               case 'c':
                       cflag = 1;
                       break;
               case 'd':
                       dflag = 1;
                       break;
               case 's':
                       sflag = 1;
                       break;
               case '?':
               default:
                       usage();
               }
       argc -= optind;
       argv += optind;

       switch(argc) {
       case 0:
       default:
               usage();
               /* NOTREACHED */
       case 1:
               isstring2 = 0;
               break;
       case 2:
               isstring2 = 1;
               break;
       }

       /*
        * tr -ds [-c] string1 string2
        * Delete all characters (or complemented characters) in string1.
        * Squeeze all characters in string2.
        */
       if (dflag && sflag) {
               if (!isstring2)
                       usage();

               setup(string1, argv[0], 1, cflag);
               setup(string2, argv[1], 2, 0);

               for (lastch = OOBCH; (ch = getchar()) != EOF; )
                       if (!string1[ch] && (!string2[ch] || lastch != ch)) {
                               lastch = ch;
                               (void)putchar(ch);
                       }
               exit(0);
       }

       /*
        * tr -d [-c] string1
        * Delete all characters (or complemented characters) in string1.
        */
       if (dflag) {
               if (isstring2)
                       usage();

               setup(string1, argv[0], 1, cflag);

               while ((ch = getchar()) != EOF)
                       if (!string1[ch])
                               (void)putchar(ch);
               exit(0);
       }

       /*
        * tr -s [-c] string1
        * Squeeze all characters (or complemented characters) in string1.
        */
       if (sflag && !isstring2) {
               setup(string1, argv[0], 1, cflag);

               for (lastch = OOBCH; (ch = getchar()) != EOF;)
                       if (!string1[ch] || lastch != ch) {
                               lastch = ch;
                               (void)putchar(ch);
                       }
               exit(0);
       }

       /*
        * tr [-cs] string1 string2
        * Replace all characters (or complemented characters) in string1 with
        * the character in the same position in string2.  If the -s option is
        * specified, squeeze all the characters in string2.
        */
       if (!isstring2)
               usage();

       /*
        * The first and second strings need to be matched up. This
        * means that if we are doing -c, we need to scan the first
        * string in advance, complement it, and match *that* against
        * the second string; otherwise we need to scan them together.
        */

       if (cflag) {
               /*
                * Scan string 1 and complement it. After this,
                * string1[] contains 0 for chars to leave alone and 1
                * for chars to translate.
                */
               setup(string1, argv[0], 1, cflag);
               s1 = NULL; /* for safety */
               /* we will use ch to iterate over string1, so start it */
               ch = -1;
       } else {
               /* Create the scanner for string 1. */
               s1 = str_create(1, argv[0]);
               for (ch = 0; ch < NCHARS; ch++) {
                       string1[ch] = ch;
               }
       }
       /* Create the scanner for string 2. */
       s2 = str_create(2, argv[1]);

       /* Read the first char of string 2 first to make sure there is one. */
       if (!next(s2, &ch2))
               errx(1, "empty string2");

       /*
        * Loop over the chars from string 1. After this loop string1[]
        * is a mapping from input to output chars.
        */
       while (1) {
               if (cflag) {
                       /*
                        * Try each character in order. For characters we
                        * skip over because we aren't translating them,
                        * set the translation to the identity.
                        */
                       ch++;
                       while (ch < NCHARS && string1[ch] == 0) {
                               if (string1[ch] == 0) {
                                       string1[ch] = ch;
                               }
                               ch++;
                       }
                       if (ch == NCHARS) {
                               break;
                       }
               }
               else {
                       /* Get the next character from string 1. */
                       if (!next(s1, &ch)) {
                               break;
                       }
               }

               /* Set the translation to the character from string 2. */
               string1[ch] = ch2;

               /* Note the characters to squeeze in string2[]. */
               if (sflag) {
                       string2[ch2] = 1;
               }

               /*
                * Get the next character from string 2. If it runs
                * out, this will keep returning the last character
                * over and over again.
                */
               (void)next(s2, &ch2);
       }

       /*
        * Now do it.
        */

       if (sflag)
               for (lastch = OOBCH; (ch = getchar()) != EOF;) {
                       ch = string1[ch];
                       if (!string2[ch] || lastch != ch) {
                               lastch = ch;
                               (void)putchar(ch);
                       }
               }
       else
               while ((ch = getchar()) != EOF)
                       (void)putchar(string1[ch]);

       /* Clean up and exit. */
       if (s1 != NULL) {
               str_destroy(s1);
       }
       str_destroy(s2);
       exit (0);
}

static void
setup(int *string, const char *arg, int whichstring, int cflag)
{
       int cnt, *p;
       int ch;
       STR *str;

       str = str_create(whichstring, arg);
       while (next(str, &ch))
               string[ch] = 1;
       if (cflag)
               for (p = string, cnt = NCHARS; cnt--; ++p)
                       *p = !*p;
       str_destroy(str);
}

static void
usage(void)
{
       (void)fprintf(stderr, "usage: tr [-cs] string1 string2\n");
       (void)fprintf(stderr, "       tr [-c] -d string1\n");
       (void)fprintf(stderr, "       tr [-c] -s string1\n");
       (void)fprintf(stderr, "       tr [-c] -ds string1 string2\n");
       exit(1);
}

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