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254 lines
6.0 KiB
C
254 lines
6.0 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) 1987,1997, Prentice Hall All rights reserved.
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*
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* The name of Prentice Hall may not 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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* 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 <andersen@codepoet.org> to be used in busybox.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "busybox.h"
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// Even with -funsigned-char, gcc still complains about char as an array index.
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#define GCC4_IS_STUPID int
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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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/* these last are pointers to static buffers declared in tr_main */
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static char *poutput, *pvector, *pinvec, *poutvec;
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static void convert(void)
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{
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int read_chars = 0, in_index = 0, out_index = 0, c, coded, last = -1;
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for (;;) {
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// If we're out of input, flush output and read more input.
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if (in_index == read_chars) {
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if (out_index) {
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if (write(1, (char *) poutput, out_index) != out_index)
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bb_error_msg_and_die(bb_msg_write_error);
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out_index = 0;
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}
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if ((read_chars = read(0, bb_common_bufsiz1, BUFSIZ)) <= 0) {
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if (write(1, (char *) poutput, out_index) != out_index)
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bb_error_msg(bb_msg_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 = bb_common_bufsiz1[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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}
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/* NOTREACHED */
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}
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static void map(char *string1, unsigned int string1_len,
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char *string2, unsigned int string2_len)
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{
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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[(GCC4_IS_STUPID)string1[i]] = last;
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else
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pvector[(GCC4_IS_STUPID)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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* Character classes, e.g. [:upper:] ==> A ... Z
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*/
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static unsigned int expand(const char *arg, char *buffer)
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{
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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++ = bb_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 (ENABLE_FEATURE_TR_CLASSES && i == ':') {
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if (strncmp(arg, "alpha", 5) == 0) {
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for (i = 'A'; i <= 'Z'; i++)
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*buffer++ = i;
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for (i = 'a'; i <= 'z'; i++)
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*buffer++ = i;
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}
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else if (strncmp(arg, "alnum", 5) == 0) {
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for (i = '0'; i <= '9'; i++)
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*buffer++ = i;
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for (i = 'A'; i <= 'Z'; i++)
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*buffer++ = i;
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for (i = 'a'; i <= 'z'; i++)
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*buffer++ = i;
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}
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else if (strncmp(arg, "digit", 5) == 0)
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for (i = '0'; i <= '9'; i++)
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*buffer++ = i;
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else if (strncmp(arg, "lower", 5) == 0)
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for (i = 'a'; i <= 'z'; i++)
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*buffer++ = i;
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else if (strncmp(arg, "upper", 5) == 0)
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for (i = 'A'; i <= 'Z'; i++)
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*buffer++ = i;
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else if (strncmp(arg, "space", 5) == 0) {
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const char s[] = "\t\n\v\f\r ";
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strcat((char*)buffer, s);
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buffer += sizeof(s) - 1;
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}
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else if (strncmp(arg, "blank", 5) == 0) {
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*buffer++ = '\t';
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*buffer++ = ' ';
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}
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/* gcc gives a warning if braces aren't used here */
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else if (strncmp(arg, "punct", 5) == 0) {
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for (i = 0; i <= ASCII; i++)
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if (isprint(i) && (!isalnum(i)) && (!isspace(i)))
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*buffer++ = i;
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}
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else if (strncmp(arg, "cntrl", 5) == 0) {
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for (i = 0; i <= ASCII; i++)
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if (iscntrl(i))
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*buffer++ = i;
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}
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else {
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*buffer++ = '[';
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*buffer++ = ':';
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continue;
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}
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break;
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}
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if (ENABLE_FEATURE_TR_EQUIV && i == '=') {
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*buffer++ = *arg;
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/* skip the closing =] */
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arg += 3;
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continue;
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}
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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(char *buffer, int buffer_len)
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{
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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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int tr_main(int argc, char **argv)
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{
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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(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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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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bb_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++], bb_common_bufsiz1);
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if (com_fl)
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input_length = complement(bb_common_bufsiz1, input_length);
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if (argv[idx] != NULL) {
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if (*argv[idx] == '\0')
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bb_error_msg_and_die("STRING2 cannot be empty");
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output_length = expand(argv[idx], output);
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map(bb_common_bufsiz1, 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[(GCC4_IS_STUPID)bb_common_bufsiz1[i]] = TRUE;
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for (i = 0; i < output_length; i++)
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outvec[(GCC4_IS_STUPID)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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