249 lines
6.7 KiB
C
249 lines
6.7 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 <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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#include "busybox.h"
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/* This must be a #define, since when DODEBUG and BUFFERS_GO_IN_BSS are
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* enabled, we otherwise get a "storage size isn't constant error. */
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#define ASCII 0377
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/* some "globals" shared across this file */
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static char com_fl, del_fl, sq_fl;
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static short in_index, out_index;
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/* these last are pointers to static buffers declared in tr_main */
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static unsigned char *poutput, *pinput;
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static unsigned char *pvector;
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static char *pinvec, *poutvec;
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static void convert(void)
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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 *) pinput, BUFSIZ)) <= 0) {
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if (write(1, (char *) poutput, out_index) != out_index)
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error_msg("%s", 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 = pinput[in_index++];
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coded = pvector[c];
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if (del_fl && pinvec[c])
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continue;
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if (sq_fl && last == coded && (pinvec[c] || poutvec[coded]))
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continue;
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poutput[out_index++] = last = coded;
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if (out_index == BUFSIZ) {
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if (write(1, (char *) poutput, out_index) != out_index)
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error_msg_and_die("%s", write_error);
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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, unsigned int string1_len,
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register unsigned char *string2, unsigned int string2_len)
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{
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unsigned char last = '0';
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unsigned int i, j;
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for (j = 0, i = 0; i < string1_len; i++) {
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if (string2_len <= j)
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pvector[string1[i]] = last;
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else
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pvector[string1[i]] = last = string2[j++];
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}
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}
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/* supported constructs:
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* Ranges, e.g., [0-9] ==> 0123456789
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* Escapes, e.g., \a ==> Control-G
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*/
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static unsigned int expand(const char *arg, register unsigned char *buffer)
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{
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unsigned char *buffer_start = buffer;
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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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*buffer++ = process_escape_sequence(&arg);
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} else if (*(arg+1) == '-') {
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ac = *(arg+2);
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if(ac == 0) {
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*buffer++ = *arg++;
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continue;
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}
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i = *arg;
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while (i <= ac)
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*buffer++ = i++;
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arg += 3; /* Skip the assumed a-z */
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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 the assumed ']' */
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} else
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*buffer++ = *arg++;
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}
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return (buffer - buffer_start);
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}
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static int complement(unsigned char *buffer, int buffer_len)
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{
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register short i, j, ix;
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char conv[ASCII + 2];
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ix = 0;
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for (i = 0; i <= ASCII; i++) {
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for (j = 0; j < buffer_len; j++)
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if (buffer[j] == i)
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break;
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if (j == buffer_len)
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conv[ix++] = i & ASCII;
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}
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memcpy(buffer, conv, ix);
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return ix;
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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 output_length=0, input_length;
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int idx = 1;
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int i;
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RESERVE_CONFIG_BUFFER(output, BUFSIZ);
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RESERVE_CONFIG_BUFFER(input, BUFSIZ);
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RESERVE_CONFIG_UBUFFER(vector, ASCII+1);
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RESERVE_CONFIG_BUFFER(invec, ASCII+1);
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RESERVE_CONFIG_BUFFER(outvec, ASCII+1);
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/* ... but make them available globally */
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poutput = output;
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pinput = input;
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pvector = vector;
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pinvec = invec;
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poutvec = outvec;
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if (argc > 1 && argv[idx][0] == '-') {
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for (ptr = (unsigned char *) &argv[idx][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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show_usage();
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}
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}
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idx++;
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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[idx] != NULL) {
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input_length = expand(argv[idx++], input);
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if (com_fl)
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input_length = complement(input, input_length);
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if (argv[idx] != NULL) {
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if (*argv[idx] == '\0')
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error_msg_and_die("STRING2 cannot be empty");
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output_length = expand(argv[idx], output);
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map(input, input_length, output, output_length);
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}
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for (i = 0; i < input_length; i++)
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invec[(int)input[i]] = TRUE;
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for (i = 0; i < output_length; i++)
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outvec[(int)output[i]] = 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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