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/* vi: set sw=4 ts=4: */
/*
* Mini tr implementation for busybox
*
* Copyright (c) Michiel Huisjes
*
* This version of tr is adapted from Minix tr and was modified
* by Erik Andersen <andersee@debian.org> to be used in busybox.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Original copyright notice is retained at the end of this file.
*/
#include "internal.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#define BB_DECLARE_EXTERN
#define bb_need_write_error
#include "messages.c"
const char *tr_usage="tr [-cds] STRING1 [STRING2]\n"
#ifndef BB_FEATURE_TRIVIAL_HELP
"\nTranslate, squeeze, and/or delete characters from\n"
"standard input, writing to standard output.\n\n"
"Options:\n"
"\t-c\ttake complement of STRING1\n"
"\t-d\tdelete input characters coded STRING1\n"
"\t-s\tsqueeze multiple output characters of STRING2 into one character\n"
#endif
;
#ifdef TRUE
#undef TRUE
#undef FALSE
#define TRUE 1
#define FALSE 0
#endif
#define ASCII 0377
/* some glabals shared across this file */
static char com_fl, del_fl, sq_fl;
static unsigned char output[BUFSIZ], input[BUFSIZ];
static unsigned char vector[ASCII + 1];
static char invec[ASCII + 1], outvec[ASCII + 1];
static short in_index, out_index;
static void convert()
{
short read_chars = 0;
short c, coded;
short last = -1;
for (;;) {
if (in_index == read_chars) {
if ((read_chars = read(0, (char *) input, BUFSIZ)) <= 0) {
if (write(1, (char *) output, out_index) != out_index)
write(2, write_error, strlen(write_error));
exit(0);
}
in_index = 0;
}
c = input[in_index++];
coded = vector[c];
if (del_fl && invec[c])
continue;
if (sq_fl && last == coded && outvec[coded])
continue;
output[out_index++] = last = coded;
if (out_index == BUFSIZ) {
if (write(1, (char *) output, out_index) != out_index) {
write(2, write_error, strlen(write_error));
exit(1);
}
out_index = 0;
}
}
/* NOTREACHED */
}
static void map(register unsigned char *string1, unsigned int string1_len,
register unsigned char *string2, unsigned int string2_len)
{
unsigned char last = '0';
unsigned int i, j;
for (j = 0, i = 0; i < string1_len; i++) {
if (string2_len <= j)
vector[string1[i]] = last;
else
vector[string1[i]] = last = string2[j++];
}
}
static unsigned int expand(char *arg, register unsigned char *buffer)
{
unsigned char *buffer_start = buffer;
int i, ac;
while (*arg) {
if (*arg == '\\') {
arg++;
*buffer++ = process_escape_sequence(&arg);
} else if (*arg == '[') {
arg++;
i = *arg++;
if (*arg++ != '-') {
*buffer++ = '[';
arg -= 2;
continue;
}
ac = *arg++;
while (i <= ac)
*buffer++ = i++;
arg++; /* Skip ']' */
} else
*buffer++ = *arg++;
}
return (buffer - buffer_start);
}
static int complement(unsigned char *buffer, unsigned int buffer_len)
{
register short i, j, index;
unsigned char conv[ASCII + 2];
index = 0;
for (i = 0; i <= ASCII; i++) {
for (j = 0; j < buffer_len; j++)
if (buffer[j] == i)
break;
if (j == buffer_len)
conv[index++] = i & ASCII;
}
memcpy(buffer, conv, index);
return index;
}
extern int tr_main(int argc, char **argv)
{
register unsigned char *ptr;
unsigned int output_length, input_length;
int index = 1;
short i;
if (argc > 1 && argv[index][0] == '-') {
for (ptr = (unsigned char *) &argv[index][1]; *ptr; ptr++) {
switch (*ptr) {
case 'c':
com_fl = TRUE;
break;
case 'd':
del_fl = TRUE;
break;
case 's':
sq_fl = TRUE;
break;
default:
usage(tr_usage);
}
}
index++;
}
for (i = 0; i <= ASCII; i++) {
vector[i] = i;
invec[i] = outvec[i] = FALSE;
}
if (argv[index] != NULL) {
input_length = expand(argv[index++], input);
if (com_fl)
input_length = complement(input, input_length);
if (argv[index] != NULL) {
if (*argv[index] == '\0')
fatalError("STRING2 cannot be empty\n");
output_length = expand(argv[index], output);
map(input, input_length, output, output_length);
}
for (i = 0; i < input_length; i++)
invec[input[i]] = TRUE;
for (i = 0; i < output_length; i++)
outvec[output[i]] = TRUE;
}
convert();
return (0);
}
/*
* Copyright (c) 1987,1997, Prentice Hall
* All rights reserved.
*
* Redistribution and use of the MINIX operating system in source and
* binary forms, with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of Prentice Hall nor the names of the software
* authors or contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, 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 PRENTICE HALL OR ANY AUTHORS 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.
*
*/
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