2000-03-05 08:07:00 +00:00
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/* vi: set sw=4 ts=4: */
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/*
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2000-05-01 22:30:37 +00:00
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* Mini tr implementation for busybox
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2000-03-05 08:07:00 +00:00
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*
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2006-06-30 16:35:40 +00:00
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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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2000-05-02 00:07:56 +00:00
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* Copyright (c) Michiel Huisjes
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*
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2004-03-15 08:29:22 +00:00
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* This version of tr is adapted from Minix tr and was modified
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2003-07-14 21:21:08 +00:00
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* by Erik Andersen <andersen@codepoet.org> to be used in busybox.
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2000-03-05 08:07:00 +00:00
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*
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2006-06-30 16:35:40 +00:00
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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2000-03-05 08:07:00 +00:00
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*/
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2007-03-30 14:43:27 +00:00
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/* http://www.opengroup.org/onlinepubs/009695399/utilities/tr.html
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* TODO: xdigit, graph, print
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*/
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2007-05-26 19:00:18 +00:00
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#include "libbb.h"
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2000-05-19 05:35:19 +00:00
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2001-07-02 17:32:40 +00:00
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#define ASCII 0377
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2000-03-05 08:07:00 +00:00
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2007-06-04 10:16:52 +00:00
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static void map(char *pvector,
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2009-03-01 04:50:18 +00:00
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unsigned char *string1, unsigned string1_len,
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unsigned char *string2, unsigned string2_len)
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2000-03-05 08:07:00 +00:00
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{
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2006-06-30 19:04:09 +00:00
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char last = '0';
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2009-03-01 04:50:18 +00:00
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unsigned i, j;
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2000-05-01 22:30:37 +00:00
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2000-07-13 16:40:41 +00:00
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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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2007-03-30 14:43:27 +00:00
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pvector[string1[i]] = last;
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2000-05-01 22:30:37 +00:00
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else
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2007-03-30 14:43:27 +00:00
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pvector[string1[i]] = last = string2[j++];
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2000-05-01 22:30:37 +00:00
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}
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2000-03-05 08:07:00 +00:00
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}
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2001-05-24 21:31:09 +00:00
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/* supported constructs:
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2007-11-13 22:22:29 +00:00
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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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* Equiv classess, e.g. [=A=] ==> A (hmmmmmmm?)
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2001-05-24 21:31:09 +00:00
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*/
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2009-03-01 04:50:18 +00:00
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static unsigned expand(const char *arg, char *buffer)
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2000-03-05 08:07:00 +00:00
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{
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2006-06-30 19:04:09 +00:00
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char *buffer_start = buffer;
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2007-11-13 22:22:29 +00:00
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unsigned i; /* can't be unsigned char: must be able to hold 256 */
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2007-03-30 14:43:27 +00:00
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unsigned char ac;
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2007-11-13 22:22:29 +00:00
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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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continue;
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}
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if (arg[1] == '-') { /* "0-9..." */
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ac = arg[2];
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if (ac == '\0') { /* "0-": copy verbatim */
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*buffer++ = *arg++; /* copy '0' */
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continue; /* next iter will copy '-' and stop */
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}
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i = *arg;
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while (i <= ac) /* ok: i is unsigned _int_ */
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*buffer++ = i++;
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arg += 3; /* skip 0-9 */
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continue;
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}
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if (*arg == '[') { /* "[xyz..." */
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arg++;
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i = *arg++;
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/* "[xyz...", i=x, arg points to y */
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if (ENABLE_FEATURE_TR_CLASSES && i == ':') {
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2007-07-24 15:54:42 +00:00
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#define CLO ":]\0"
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2007-11-13 22:22:29 +00:00
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static const char classes[] ALIGN1 =
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"alpha"CLO "alnum"CLO "digit"CLO
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"lower"CLO "upper"CLO "space"CLO
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2009-03-01 04:50:18 +00:00
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"blank"CLO "punct"CLO "cntrl"CLO
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"xdigit"CLO;
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2007-03-30 14:43:27 +00:00
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#define CLASS_invalid 0 /* we increment the retval */
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#define CLASS_alpha 1
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#define CLASS_alnum 2
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#define CLASS_digit 3
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#define CLASS_lower 4
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#define CLASS_upper 5
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#define CLASS_space 6
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#define CLASS_blank 7
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#define CLASS_punct 8
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#define CLASS_cntrl 9
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2009-03-01 04:50:18 +00:00
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#define CLASS_xdigit 10
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2007-03-30 14:43:27 +00:00
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//#define CLASS_graph 11
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//#define CLASS_print 12
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smalluint j;
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2009-03-01 04:50:18 +00:00
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{
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/* xdigit needs 8, not 7 */
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char *tmp = xstrndup(arg, 7 + (arg[0]=='x'));
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2007-07-24 15:54:42 +00:00
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j = index_in_strings(classes, tmp) + 1;
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2007-06-04 10:16:52 +00:00
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free(tmp);
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2005-10-08 21:21:08 +00:00
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}
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2009-03-01 04:50:18 +00:00
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if (j == CLASS_alnum || j == CLASS_digit || j == CLASS_xdigit) {
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2006-04-19 22:22:06 +00:00
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for (i = '0'; i <= '9'; i++)
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*buffer++ = i;
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2007-03-30 14:43:27 +00:00
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}
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if (j == CLASS_alpha || j == CLASS_alnum || j == CLASS_upper) {
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2005-10-08 21:21:08 +00:00
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for (i = 'A'; i <= 'Z'; i++)
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*buffer++ = i;
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}
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2007-03-30 14:43:27 +00:00
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if (j == CLASS_alpha || j == CLASS_alnum || j == CLASS_lower) {
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2005-10-08 21:21:08 +00:00
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for (i = 'a'; i <= 'z'; i++)
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*buffer++ = i;
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2006-04-19 22:22:06 +00:00
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}
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2007-03-30 14:43:27 +00:00
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if (j == CLASS_space || j == CLASS_blank) {
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2006-04-19 22:22:06 +00:00
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*buffer++ = '\t';
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2007-03-30 14:43:27 +00:00
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if (j == CLASS_space) {
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*buffer++ = '\n';
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*buffer++ = '\v';
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*buffer++ = '\f';
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*buffer++ = '\r';
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}
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2006-04-19 22:22:06 +00:00
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*buffer++ = ' ';
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}
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2007-03-30 14:43:27 +00:00
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if (j == CLASS_punct || j == CLASS_cntrl) {
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2007-11-13 22:22:29 +00:00
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for (i = '\0'; i <= ASCII; i++)
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if ((j == CLASS_punct && isprint(i) && !isalnum(i) && !isspace(i))
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|| (j == CLASS_cntrl && iscntrl(i)))
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2005-10-08 21:21:08 +00:00
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*buffer++ = i;
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}
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2009-03-01 04:50:18 +00:00
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if (j == CLASS_xdigit) {
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for (i = 'A'; i <= 'F'; i++) {
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*buffer++ = i;
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*buffer++ = i | 0x20;
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}
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}
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2007-03-30 14:43:27 +00:00
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if (j == CLASS_invalid) {
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2006-04-19 22:22:06 +00:00
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*buffer++ = '[';
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*buffer++ = ':';
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2005-10-08 21:21:08 +00:00
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continue;
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}
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break;
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}
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2007-11-13 22:22:29 +00:00
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/* "[xyz...", i=x, arg points to y */
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if (ENABLE_FEATURE_TR_EQUIV && i == '=') { /* [=CHAR=] */
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*buffer++ = *arg; /* copy CHAR */
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2008-07-28 23:49:42 +00:00
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if (!*arg || arg[1] != '=' || arg[2] != ']')
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bb_show_usage();
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2007-11-13 22:22:29 +00:00
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arg += 3; /* skip CHAR=] */
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2005-10-08 21:21:08 +00:00
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continue;
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}
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2009-03-01 04:50:18 +00:00
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/* The rest of [xyz... cases is treated as normal
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* string, '[' has no special meaning here:
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* tr "[a-z]" "[A-Z]" can be written as tr "a-z" "A-Z",
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* also try tr "[a-z]" "_A-Z+" and you'll see that
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* [] is not special here.
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*/
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*buffer++ = '[';
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arg--; /* points to x */
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2007-11-13 22:22:29 +00:00
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continue;
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}
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*buffer++ = *arg++;
|
2000-03-05 08:07:00 +00:00
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}
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2000-07-13 16:40:41 +00:00
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return (buffer - buffer_start);
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2000-03-05 08:07:00 +00:00
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}
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2006-06-30 19:04:09 +00:00
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static int complement(char *buffer, int buffer_len)
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2000-03-05 08:07:00 +00:00
|
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{
|
2009-03-01 04:50:18 +00:00
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int ch, j, len;
|
2000-07-14 06:49:52 +00:00
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char conv[ASCII + 2];
|
2000-05-01 22:30:37 +00:00
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|
2009-03-01 04:50:18 +00:00
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len = 0;
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for (ch = '\0'; ch <= ASCII; ch++) {
|
2000-07-13 16:40:41 +00:00
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for (j = 0; j < buffer_len; j++)
|
2009-03-01 04:50:18 +00:00
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if (buffer[j] == ch)
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goto next_ch;
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/* Didn't find it */
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conv[len++] = (char) ch;
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next_ch:
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continue;
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2000-03-05 08:07:00 +00:00
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}
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2009-03-01 04:50:18 +00:00
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memcpy(buffer, conv, len);
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return len;
|
2000-03-05 08:07:00 +00:00
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}
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|
2007-10-11 10:05:36 +00:00
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int tr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
2008-07-05 09:18:54 +00:00
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int tr_main(int argc UNUSED_PARAM, char **argv)
|
2000-03-05 08:07:00 +00:00
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{
|
2000-07-14 06:49:52 +00:00
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int i;
|
2007-11-13 22:23:57 +00:00
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smalluint flags;
|
2009-03-01 04:50:18 +00:00
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ssize_t read_chars;
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size_t in_index, out_index;
|
2007-11-13 22:22:29 +00:00
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unsigned last = UCHAR_MAX + 1; /* not equal to any char */
|
2007-12-24 14:09:19 +00:00
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unsigned char coded, c;
|
2007-11-13 22:23:57 +00:00
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unsigned char *output = xmalloc(BUFSIZ);
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char *vector = xzalloc((ASCII+1) * 3);
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char *invec = vector + (ASCII+1);
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char *outvec = vector + (ASCII+1) * 2;
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#define TR_OPT_complement (1 << 0)
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#define TR_OPT_delete (1 << 1)
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#define TR_OPT_squeeze_reps (1 << 2)
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flags = getopt32(argv, "+cds"); /* '+': stop at first non-option */
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argv += optind;
|
2001-01-23 22:30:04 +00:00
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|
2000-05-01 22:30:37 +00:00
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for (i = 0; i <= ASCII; i++) {
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vector[i] = i;
|
2007-11-13 22:23:57 +00:00
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/*invec[i] = outvec[i] = FALSE; - done by xzalloc */
|
2000-03-05 08:07:00 +00:00
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}
|
|
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|
2007-06-04 10:16:52 +00:00
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#define tr_buf bb_common_bufsiz1
|
2007-11-13 22:23:57 +00:00
|
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if (*argv != NULL) {
|
2009-03-01 04:50:18 +00:00
|
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int output_length = 0;
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int input_length;
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|
2007-11-13 22:23:57 +00:00
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input_length = expand(*argv++, tr_buf);
|
2007-03-30 14:43:27 +00:00
|
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|
if (flags & TR_OPT_complement)
|
2007-06-04 10:16:52 +00:00
|
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|
input_length = complement(tr_buf, input_length);
|
2007-11-13 22:23:57 +00:00
|
|
|
if (*argv) {
|
|
|
|
if (argv[0][0] == '\0')
|
2003-03-19 09:13:01 +00:00
|
|
|
bb_error_msg_and_die("STRING2 cannot be empty");
|
2008-05-09 18:07:15 +00:00
|
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|
output_length = expand(*argv, (char *)output);
|
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map(vector, (unsigned char *)tr_buf, input_length, output, output_length);
|
2000-07-10 16:38:50 +00:00
|
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}
|
2000-07-13 16:40:41 +00:00
|
|
|
for (i = 0; i < input_length; i++)
|
2007-06-04 10:16:52 +00:00
|
|
|
invec[(unsigned char)tr_buf[i]] = TRUE;
|
2000-07-13 16:40:41 +00:00
|
|
|
for (i = 0; i < output_length; i++)
|
2007-03-30 14:43:27 +00:00
|
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|
outvec[output[i]] = TRUE;
|
2000-05-01 22:30:37 +00:00
|
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}
|
2007-06-04 10:16:52 +00:00
|
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|
|
2009-03-01 04:50:18 +00:00
|
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|
goto start_from;
|
|
|
|
|
2007-06-04 10:16:52 +00:00
|
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|
for (;;) {
|
|
|
|
/* If we're out of input, flush output and read more input. */
|
2008-05-13 02:27:31 +00:00
|
|
|
if ((ssize_t)in_index == read_chars) {
|
2007-06-04 10:16:52 +00:00
|
|
|
if (out_index) {
|
|
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|
xwrite(STDOUT_FILENO, (char *)output, out_index);
|
2009-03-01 04:50:18 +00:00
|
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|
start_from:
|
2007-06-04 10:16:52 +00:00
|
|
|
out_index = 0;
|
|
|
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}
|
2007-11-13 22:22:29 +00:00
|
|
|
read_chars = safe_read(STDIN_FILENO, tr_buf, BUFSIZ);
|
2007-06-04 10:16:52 +00:00
|
|
|
if (read_chars <= 0) {
|
2007-11-13 17:51:40 +00:00
|
|
|
if (read_chars < 0)
|
|
|
|
bb_perror_msg_and_die(bb_msg_read_error);
|
2009-03-01 04:50:18 +00:00
|
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|
break;
|
2007-06-04 10:16:52 +00:00
|
|
|
}
|
|
|
|
in_index = 0;
|
|
|
|
}
|
|
|
|
c = tr_buf[in_index++];
|
|
|
|
if ((flags & TR_OPT_delete) && invec[c])
|
|
|
|
continue;
|
2009-03-01 04:50:18 +00:00
|
|
|
coded = vector[c];
|
2007-11-13 22:22:29 +00:00
|
|
|
if ((flags & TR_OPT_squeeze_reps) && last == coded
|
|
|
|
&& (invec[c] || outvec[coded]))
|
2007-06-04 10:16:52 +00:00
|
|
|
continue;
|
|
|
|
output[out_index++] = last = coded;
|
|
|
|
}
|
2009-03-01 04:50:18 +00:00
|
|
|
|
2007-03-30 14:43:27 +00:00
|
|
|
return EXIT_SUCCESS;
|
2000-03-05 08:07:00 +00:00
|
|
|
}
|