1 /* vi: set sw=4 ts=4: */
3 * Mini tr implementation for busybox
5 * This version of tr is adapted from Minix tr
6 * Author: Michiel Huisjes
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * Original copyright notice is retained at the end of this file.
30 #include <sys/types.h>
43 /* some glabals shared across this file */
44 static char com_fl, del_fl, sq_fl;
45 static unsigned char output[BUFSIZ], input[BUFSIZ];
46 static unsigned char vector[ASCII + 1];
47 static char invec[ASCII + 1], outvec[ASCII + 1];
48 static short in_index, out_index;
58 if (in_index == read_chars) {
59 if ((read_chars = read(0, (char *) input, BUFSIZ)) <= 0) {
60 if (write(1, (char *) output, out_index) != out_index)
61 write(2, "Bad write\n", 10);
66 c = input[in_index++];
68 if (del_fl && invec[c])
70 if (sq_fl && last == coded && outvec[coded])
72 output[out_index++] = last = coded;
73 if (out_index == BUFSIZ) {
74 if (write(1, (char *) output, out_index) != out_index) {
75 write(2, "Bad write\n", 10);
85 static void map(register unsigned char *string1, register unsigned char *string2)
87 unsigned char last = '0';
91 vector[*string1] = last;
93 vector[*string1] = last = *string2++;
98 static void expand(register char *arg, register unsigned char *buffer)
106 if (*arg >= '0' && *arg <= '7') {
108 ac = (ac << 3) + *arg++ - '0';
110 } while (i < 4 && *arg >= '0' && *arg <= '7');
112 } else if (*arg != '\0')
114 } else if (*arg == '[') {
125 arg++; /* Skip ']' */
131 static void complement(unsigned char *buffer)
133 register unsigned char *ptr;
134 register short i, index;
135 unsigned char conv[ASCII + 2];
138 for (i = 1; i <= ASCII; i++) {
139 for (ptr = buffer; *ptr; ptr++)
143 conv[index++] = i & ASCII;
146 strcpy((char *) buffer, (char *) conv);
149 extern int tr_main(int argc, char **argv)
151 register unsigned char *ptr;
155 if (argc > 1 && argv[index][0] == '-') {
156 for (ptr = (unsigned char *) &argv[index][1]; *ptr; ptr++) {
168 usage("tr [-cds] STRING1 [STRING2]\n"
169 #ifndef BB_FEATURE_TRIVIAL_HELP
170 "\nTranslate, squeeze, and/or delete characters from\n"
171 "standard input, writing to standard output.\n\n"
173 "\t-c\ttake complement of STRING1\n"
174 "\t-d\tdelete input characters coded STRING1\n"
175 "\t-s\tsqueeze multiple output characters of STRING2 into one character\n"
182 for (i = 0; i <= ASCII; i++) {
184 invec[i] = outvec[i] = FALSE;
187 if (argv[index] != NULL) {
188 expand(argv[index++], input);
191 if (argv[index] != NULL)
192 expand(argv[index], output);
193 if (argv[index] != NULL)
195 for (ptr = input; *ptr; ptr++)
197 for (ptr = output; *ptr; ptr++)
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