source: MondoRescue/branches/2.2.2/mindi-busybox/coreutils/tr.c@ 1247

Last change on this file since 1247 was 821, checked in by Bruno Cornec, 18 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)
File size: 6.0 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini tr implementation for busybox
4 *
5 ** Copyright (c) 1987,1997, Prentice Hall All rights reserved.
6 *
7 * The name of Prentice Hall may not be used to endorse or promote
8 * products derived from this software without specific prior
9 * written permission.
10 *
11 * Copyright (c) Michiel Huisjes
12 *
13 * This version of tr is adapted from Minix tr and was modified
14 * by Erik Andersen <andersen@codepoet.org> to be used in busybox.
15 *
16 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
17 */
18
19#include "busybox.h"
20
21// Even with -funsigned-char, gcc still complains about char as an array index.
22
23#define GCC4_IS_STUPID int
24
25#define ASCII 0377
26
27/* some "globals" shared across this file */
28static char com_fl, del_fl, sq_fl;
29/* these last are pointers to static buffers declared in tr_main */
30static char *poutput, *pvector, *pinvec, *poutvec;
31
32static void convert(void)
33{
34 int read_chars = 0, in_index = 0, out_index = 0, c, coded, last = -1;
35
36 for (;;) {
37 // If we're out of input, flush output and read more input.
38
39 if (in_index == read_chars) {
40 if (out_index) {
41 if (write(1, (char *) poutput, out_index) != out_index)
42 bb_error_msg_and_die(bb_msg_write_error);
43 out_index = 0;
44 }
45
46 if ((read_chars = read(0, bb_common_bufsiz1, BUFSIZ)) <= 0) {
47 if (write(1, (char *) poutput, out_index) != out_index)
48 bb_error_msg(bb_msg_write_error);
49 exit(0);
50 }
51 in_index = 0;
52 }
53 c = bb_common_bufsiz1[in_index++];
54 coded = pvector[c];
55 if (del_fl && pinvec[c])
56 continue;
57 if (sq_fl && last == coded && (pinvec[c] || poutvec[coded]))
58 continue;
59 poutput[out_index++] = last = coded;
60 }
61
62 /* NOTREACHED */
63}
64
65static void map(char *string1, unsigned int string1_len,
66 char *string2, unsigned int string2_len)
67{
68 char last = '0';
69 unsigned int i, j;
70
71 for (j = 0, i = 0; i < string1_len; i++) {
72 if (string2_len <= j)
73 pvector[(GCC4_IS_STUPID)string1[i]] = last;
74 else
75 pvector[(GCC4_IS_STUPID)string1[i]] = last = string2[j++];
76 }
77}
78
79/* supported constructs:
80 * Ranges, e.g., [0-9] ==> 0123456789
81 * Escapes, e.g., \a ==> Control-G
82 * Character classes, e.g. [:upper:] ==> A ... Z
83 */
84static unsigned int expand(const char *arg, char *buffer)
85{
86 char *buffer_start = buffer;
87 int i, ac;
88
89 while (*arg) {
90 if (*arg == '\\') {
91 arg++;
92 *buffer++ = bb_process_escape_sequence(&arg);
93 } else if (*(arg+1) == '-') {
94 ac = *(arg+2);
95 if(ac == 0) {
96 *buffer++ = *arg++;
97 continue;
98 }
99 i = *arg;
100 while (i <= ac)
101 *buffer++ = i++;
102 arg += 3; /* Skip the assumed a-z */
103 } else if (*arg == '[') {
104 arg++;
105 i = *arg++;
106 if (ENABLE_FEATURE_TR_CLASSES && i == ':') {
107 if (strncmp(arg, "alpha", 5) == 0) {
108 for (i = 'A'; i <= 'Z'; i++)
109 *buffer++ = i;
110 for (i = 'a'; i <= 'z'; i++)
111 *buffer++ = i;
112 }
113 else if (strncmp(arg, "alnum", 5) == 0) {
114 for (i = '0'; i <= '9'; i++)
115 *buffer++ = i;
116 for (i = 'A'; i <= 'Z'; i++)
117 *buffer++ = i;
118 for (i = 'a'; i <= 'z'; i++)
119 *buffer++ = i;
120 }
121 else if (strncmp(arg, "digit", 5) == 0)
122 for (i = '0'; i <= '9'; i++)
123 *buffer++ = i;
124 else if (strncmp(arg, "lower", 5) == 0)
125 for (i = 'a'; i <= 'z'; i++)
126 *buffer++ = i;
127 else if (strncmp(arg, "upper", 5) == 0)
128 for (i = 'A'; i <= 'Z'; i++)
129 *buffer++ = i;
130 else if (strncmp(arg, "space", 5) == 0) {
131 const char s[] = "\t\n\v\f\r ";
132 strcat((char*)buffer, s);
133 buffer += sizeof(s) - 1;
134 }
135 else if (strncmp(arg, "blank", 5) == 0) {
136 *buffer++ = '\t';
137 *buffer++ = ' ';
138 }
139 /* gcc gives a warning if braces aren't used here */
140 else if (strncmp(arg, "punct", 5) == 0) {
141 for (i = 0; i <= ASCII; i++)
142 if (isprint(i) && (!isalnum(i)) && (!isspace(i)))
143 *buffer++ = i;
144 }
145 else if (strncmp(arg, "cntrl", 5) == 0) {
146 for (i = 0; i <= ASCII; i++)
147 if (iscntrl(i))
148 *buffer++ = i;
149 }
150 else {
151 *buffer++ = '[';
152 *buffer++ = ':';
153 continue;
154 }
155 break;
156 }
157 if (ENABLE_FEATURE_TR_EQUIV && i == '=') {
158 *buffer++ = *arg;
159 /* skip the closing =] */
160 arg += 3;
161 continue;
162 }
163 if (*arg++ != '-') {
164 *buffer++ = '[';
165 arg -= 2;
166 continue;
167 }
168 ac = *arg++;
169 while (i <= ac)
170 *buffer++ = i++;
171 arg++; /* Skip the assumed ']' */
172 } else
173 *buffer++ = *arg++;
174 }
175
176 return (buffer - buffer_start);
177}
178
179static int complement(char *buffer, int buffer_len)
180{
181 register short i, j, ix;
182 char conv[ASCII + 2];
183
184 ix = 0;
185 for (i = 0; i <= ASCII; i++) {
186 for (j = 0; j < buffer_len; j++)
187 if (buffer[j] == i)
188 break;
189 if (j == buffer_len)
190 conv[ix++] = i & ASCII;
191 }
192 memcpy(buffer, conv, ix);
193 return ix;
194}
195
196int tr_main(int argc, char **argv)
197{
198 register unsigned char *ptr;
199 int output_length=0, input_length;
200 int idx = 1;
201 int i;
202 RESERVE_CONFIG_BUFFER(output, BUFSIZ);
203 RESERVE_CONFIG_BUFFER(vector, ASCII+1);
204 RESERVE_CONFIG_BUFFER(invec, ASCII+1);
205 RESERVE_CONFIG_BUFFER(outvec, ASCII+1);
206
207 /* ... but make them available globally */
208 poutput = output;
209 pvector = vector;
210 pinvec = invec;
211 poutvec = outvec;
212
213 if (argc > 1 && argv[idx][0] == '-') {
214 for (ptr = (unsigned char *) &argv[idx][1]; *ptr; ptr++) {
215 switch (*ptr) {
216 case 'c':
217 com_fl = TRUE;
218 break;
219 case 'd':
220 del_fl = TRUE;
221 break;
222 case 's':
223 sq_fl = TRUE;
224 break;
225 default:
226 bb_show_usage();
227 }
228 }
229 idx++;
230 }
231 for (i = 0; i <= ASCII; i++) {
232 vector[i] = i;
233 invec[i] = outvec[i] = FALSE;
234 }
235
236 if (argv[idx] != NULL) {
237 input_length = expand(argv[idx++], bb_common_bufsiz1);
238 if (com_fl)
239 input_length = complement(bb_common_bufsiz1, input_length);
240 if (argv[idx] != NULL) {
241 if (*argv[idx] == '\0')
242 bb_error_msg_and_die("STRING2 cannot be empty");
243 output_length = expand(argv[idx], output);
244 map(bb_common_bufsiz1, input_length, output, output_length);
245 }
246 for (i = 0; i < input_length; i++)
247 invec[(GCC4_IS_STUPID)bb_common_bufsiz1[i]] = TRUE;
248 for (i = 0; i < output_length; i++)
249 outvec[(GCC4_IS_STUPID)output[i]] = TRUE;
250 }
251 convert();
252 return (0);
253}
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