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63#include "libbb.h"
64
65enum {
66 ASCII = 256,
67
68
69
70
71 TR_BUFSIZ = (BUFSIZ > ASCII*2) ? BUFSIZ : ASCII*2,
72};
73
74static void map(char *pvector,
75 char *string1, unsigned string1_len,
76 char *string2, unsigned string2_len)
77{
78 char last = '0';
79 unsigned i, j;
80
81 for (j = 0, i = 0; i < string1_len; i++) {
82 if (string2_len <= j)
83 pvector[(unsigned char)(string1[i])] = last;
84 else
85 pvector[(unsigned char)(string1[i])] = last = string2[j++];
86 }
87}
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102static unsigned expand(char *arg, char **buffer_p)
103{
104 char *buffer = *buffer_p;
105 unsigned pos = 0;
106 unsigned size = TR_BUFSIZ;
107 unsigned i;
108 unsigned char ac;
109
110 while (*arg) {
111 if (pos + ASCII > size) {
112 size += ASCII;
113 *buffer_p = buffer = xrealloc(buffer, size);
114 }
115 if (*arg == '\\') {
116 const char *z;
117 arg++;
118 z = arg;
119 ac = bb_process_escape_sequence(&z);
120 arg = (char *)z;
121 arg--;
122 *arg = ac;
123
124
125
126
127 }
128 if (arg[1] == '-') {
129 ac = arg[2];
130 if (ac == '\0') {
131 buffer[pos++] = *arg++;
132 continue;
133 }
134 i = (unsigned char) *arg;
135 arg += 3;
136 if (ac == '\\') {
137 const char *z;
138 z = arg;
139 ac = bb_process_escape_sequence(&z);
140 arg = (char *)z;
141 }
142 while (i <= ac)
143 buffer[pos++] = i++;
144 continue;
145 }
146 if ((ENABLE_FEATURE_TR_CLASSES || ENABLE_FEATURE_TR_EQUIV)
147 && *arg == '['
148 ) {
149 arg++;
150 i = (unsigned char) *arg++;
151
152 if (ENABLE_FEATURE_TR_CLASSES && i == ':') {
153#define CLO ":]\0"
154 static const char classes[] ALIGN1 =
155 "alpha"CLO "alnum"CLO "digit"CLO
156 "lower"CLO "upper"CLO "space"CLO
157 "blank"CLO "punct"CLO "cntrl"CLO
158 "xdigit"CLO;
159 enum {
160 CLASS_invalid = 0,
161 CLASS_alpha = 1,
162 CLASS_alnum = 2,
163 CLASS_digit = 3,
164 CLASS_lower = 4,
165 CLASS_upper = 5,
166 CLASS_space = 6,
167 CLASS_blank = 7,
168 CLASS_punct = 8,
169 CLASS_cntrl = 9,
170 CLASS_xdigit = 10,
171
172
173 };
174 smalluint j;
175 char *tmp;
176
177
178 i = 7 + (arg[0] == 'x');
179 tmp = xstrndup(arg, i);
180 j = index_in_strings(classes, tmp) + 1;
181 free(tmp);
182
183 if (j == CLASS_invalid)
184 goto skip_bracket;
185
186 arg += i;
187 if (j == CLASS_alnum || j == CLASS_digit || j == CLASS_xdigit) {
188 for (i = '0'; i <= '9'; i++)
189 buffer[pos++] = i;
190 }
191 if (j == CLASS_alpha || j == CLASS_alnum || j == CLASS_upper) {
192 for (i = 'A'; i <= 'Z'; i++)
193 buffer[pos++] = i;
194 }
195 if (j == CLASS_alpha || j == CLASS_alnum || j == CLASS_lower) {
196 for (i = 'a'; i <= 'z'; i++)
197 buffer[pos++] = i;
198 }
199 if (j == CLASS_space || j == CLASS_blank) {
200 buffer[pos++] = '\t';
201 if (j == CLASS_space) {
202 buffer[pos++] = '\n';
203 buffer[pos++] = '\v';
204 buffer[pos++] = '\f';
205 buffer[pos++] = '\r';
206 }
207 buffer[pos++] = ' ';
208 }
209 if (j == CLASS_punct || j == CLASS_cntrl) {
210 for (i = '\0'; i < ASCII; i++) {
211 if ((j == CLASS_punct && isprint_asciionly(i) && !isalnum(i) && !isspace(i))
212 || (j == CLASS_cntrl && iscntrl(i))
213 ) {
214 buffer[pos++] = i;
215 }
216 }
217 }
218 if (j == CLASS_xdigit) {
219 for (i = 'A'; i <= 'F'; i++) {
220 buffer[pos + 6] = i | 0x20;
221 buffer[pos++] = i;
222 }
223 pos += 6;
224 }
225 continue;
226 }
227
228 if (ENABLE_FEATURE_TR_EQUIV && i == '=') {
229 buffer[pos++] = *arg;
230 if (!arg[0] || arg[1] != '=' || arg[2] != ']')
231 bb_show_usage();
232 arg += 3;
233 continue;
234 }
235
236
237
238
239
240
241 skip_bracket:
242 arg -= 2;
243 }
244 buffer[pos++] = *arg++;
245 }
246 return pos;
247}
248
249
250
251
252static int complement(char *buffer, int buffer_len)
253{
254 int len;
255 char conv[ASCII];
256 unsigned char ch;
257
258 len = 0;
259 ch = '\0';
260 while (1) {
261 if (memchr(buffer, ch, buffer_len) == NULL)
262 conv[len++] = ch;
263 if (++ch == '\0')
264 break;
265 }
266 memcpy(buffer, conv, len);
267 return len;
268}
269
270int tr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
271int tr_main(int argc UNUSED_PARAM, char **argv)
272{
273 int i;
274 smalluint opts;
275 ssize_t read_chars;
276 size_t in_index, out_index;
277 unsigned last = UCHAR_MAX + 1;
278 unsigned char coded, c;
279 char *str1 = xmalloc(TR_BUFSIZ);
280 char *str2 = xmalloc(TR_BUFSIZ);
281 int str2_length;
282 int str1_length;
283 char *vector = xzalloc(ASCII * 3);
284 char *invec = vector + ASCII;
285 char *outvec = vector + ASCII * 2;
286
287#define TR_OPT_complement (3 << 0)
288#define TR_OPT_delete (1 << 2)
289#define TR_OPT_squeeze_reps (1 << 3)
290
291 for (i = 0; i < ASCII; i++) {
292 vector[i] = i;
293
294 }
295
296
297
298
299
300
301
302 opts = getopt32(argv, "^+" "Ccds" "\0" "-1");
303 argv += optind;
304
305 str1_length = expand(*argv++, &str1);
306 str2_length = 0;
307 if (opts & TR_OPT_complement)
308 str1_length = complement(str1, str1_length);
309 if (*argv) {
310 if (argv[0][0] == '\0')
311 bb_error_msg_and_die("STRING2 cannot be empty");
312 str2_length = expand(*argv, &str2);
313 map(vector, str1, str1_length,
314 str2, str2_length);
315 }
316 for (i = 0; i < str1_length; i++)
317 invec[(unsigned char)(str1[i])] = TRUE;
318 for (i = 0; i < str2_length; i++)
319 outvec[(unsigned char)(str2[i])] = TRUE;
320
321 goto start_from;
322
323
324
325 for (;;) {
326
327 if ((ssize_t)in_index == read_chars) {
328 if (out_index) {
329 xwrite(STDOUT_FILENO, str2, out_index);
330 start_from:
331 out_index = 0;
332 }
333 read_chars = safe_read(STDIN_FILENO, str1, TR_BUFSIZ);
334 if (read_chars <= 0) {
335 if (read_chars < 0)
336 bb_perror_msg_and_die(bb_msg_read_error);
337 break;
338 }
339 in_index = 0;
340 }
341 c = str1[in_index++];
342 if ((opts & TR_OPT_delete) && invec[c])
343 continue;
344 coded = vector[c];
345 if ((opts & TR_OPT_squeeze_reps) && last == coded
346 && (invec[c] || outvec[coded])
347 ) {
348 continue;
349 }
350 str2[out_index++] = last = coded;
351 }
352
353 if (ENABLE_FEATURE_CLEAN_UP) {
354 free(vector);
355 free(str2);
356 free(str1);
357 }
358
359 return EXIT_SUCCESS;
360}
361