247 lines
6.3 KiB
C
247 lines
6.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini tr implementation for busybox
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*
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* Copyright (c) Michiel Huisjes
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*
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* This version of tr is adapted from Minix tr and was modified
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* by Erik Andersen <andersee@debian.org> to be used in busybox.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Original copyright notice is retained at the end of this file.
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*/
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#include "internal.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#define BB_DECLARE_EXTERN
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#define bb_need_write_error
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#include "messages.c"
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const char *tr_usage="tr [-cds] STRING1 [STRING2]\n"
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#ifndef BB_FEATURE_TRIVIAL_HELP
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"\nTranslate, squeeze, and/or delete characters from\n"
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"standard input, writing to standard output.\n\n"
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"Options:\n"
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"\t-c\ttake complement of STRING1\n"
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"\t-d\tdelete input characters coded STRING1\n"
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"\t-s\tsqueeze multiple output characters of STRING2 into one character\n"
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#endif
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;
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#ifdef TRUE
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#undef TRUE
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#undef FALSE
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#define TRUE 1
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#define FALSE 0
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#endif
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#define ASCII 0377
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/* some glabals shared across this file */
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static char com_fl, del_fl, sq_fl;
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static unsigned char output[BUFSIZ], input[BUFSIZ];
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static unsigned char vector[ASCII + 1];
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static char invec[ASCII + 1], outvec[ASCII + 1];
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static short in_index, out_index;
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static void convert()
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{
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short read_chars = 0;
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short c, coded;
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short last = -1;
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for (;;) {
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if (in_index == read_chars) {
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if ((read_chars = read(0, (char *) input, BUFSIZ)) <= 0) {
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if (write(1, (char *) output, out_index) != out_index)
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write(2, write_error, strlen(write_error));
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exit(0);
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}
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in_index = 0;
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}
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c = input[in_index++];
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coded = vector[c];
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if (del_fl && invec[c])
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continue;
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if (sq_fl && last == coded && outvec[coded])
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continue;
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output[out_index++] = last = coded;
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if (out_index == BUFSIZ) {
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if (write(1, (char *) output, out_index) != out_index) {
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write(2, write_error, strlen(write_error));
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exit(1);
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}
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out_index = 0;
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}
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}
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/* NOTREACHED */
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}
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static void map(register unsigned char *string1, register unsigned char *string2)
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{
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unsigned char last = '0';
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while (*string1) {
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if (*string2 == '\0')
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vector[*string1] = last;
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else
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vector[*string1] = last = *string2++;
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string1++;
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}
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}
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static void expand(register char *arg, register unsigned char *buffer)
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{
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int i, ac;
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while (*arg) {
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if (*arg == '\\') {
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arg++;
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i = ac = 0;
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if (*arg >= '0' && *arg <= '7') {
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do {
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ac = (ac << 3) + *arg++ - '0';
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i++;
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} while (i < 4 && *arg >= '0' && *arg <= '7');
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*buffer++ = ac;
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} else if (*arg != '\0')
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*buffer++ = *arg++;
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} else if (*arg == '[') {
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arg++;
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i = *arg++;
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if (*arg++ != '-') {
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*buffer++ = '[';
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arg -= 2;
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continue;
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}
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ac = *arg++;
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while (i <= ac)
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*buffer++ = i++;
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arg++; /* Skip ']' */
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} else
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*buffer++ = *arg++;
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}
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}
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static void complement(unsigned char *buffer)
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{
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register unsigned char *ptr;
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register short i, index;
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unsigned char conv[ASCII + 2];
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index = 0;
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for (i = 1; i <= ASCII; i++) {
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for (ptr = buffer; *ptr; ptr++)
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if (*ptr == i)
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break;
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if (*ptr == '\0')
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conv[index++] = i & ASCII;
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}
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conv[index] = '\0';
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strcpy((char *) buffer, (char *) conv);
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}
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extern int tr_main(int argc, char **argv)
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{
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register unsigned char *ptr;
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int index = 1;
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short i;
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if (argc > 1 && argv[index][0] == '-') {
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for (ptr = (unsigned char *) &argv[index][1]; *ptr; ptr++) {
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switch (*ptr) {
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case 'c':
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com_fl = TRUE;
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break;
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case 'd':
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del_fl = TRUE;
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break;
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case 's':
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sq_fl = TRUE;
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break;
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default:
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usage(tr_usage);
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}
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}
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index++;
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}
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for (i = 0; i <= ASCII; i++) {
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vector[i] = i;
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invec[i] = outvec[i] = FALSE;
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}
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if (argv[index] != NULL) {
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expand(argv[index++], input);
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if (com_fl)
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complement(input);
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if (argv[index] != NULL)
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expand(argv[index], output);
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if (argv[index] != NULL)
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map(input, output);
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for (ptr = input; *ptr; ptr++)
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invec[*ptr] = TRUE;
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for (ptr = output; *ptr; ptr++)
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outvec[*ptr] = TRUE;
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}
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convert();
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return (0);
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}
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/*
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* Copyright (c) 1987,1997, Prentice Hall
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* All rights reserved.
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*
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* Redistribution and use of the MINIX operating system in source and
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* binary forms, with or without modification, are permitted provided
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* that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of Prentice Hall nor the names of the software
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* authors or contributors may be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, AND
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* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL PRENTICE HALL OR ANY AUTHORS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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