[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini tr implementation for busybox
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| 4 | *
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| 5 | ** Copyright (c) 1987,1997, Prentice Hall All rights reserved.
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| 6 | *
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| 7 | * The name of Prentice Hall may not be used to endorse or promote
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| 8 | * products derived from this software without specific prior
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| 9 | * written permission.
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| 10 | *
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| 11 | * Copyright (c) Michiel Huisjes
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| 12 | *
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| 13 | * This version of tr is adapted from Minix tr and was modified
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| 14 | * by Erik Andersen <andersen@codepoet.org> to be used in busybox.
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| 15 | *
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| 16 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 17 | */
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| 18 |
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| 19 | #include "busybox.h"
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| 20 |
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| 21 | // Even with -funsigned-char, gcc still complains about char as an array index.
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| 22 |
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| 23 | #define GCC4_IS_STUPID int
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| 24 |
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| 25 | #define ASCII 0377
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| 26 |
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| 27 | /* some "globals" shared across this file */
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| 28 | static char com_fl, del_fl, sq_fl;
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| 29 | /* these last are pointers to static buffers declared in tr_main */
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| 30 | static char *poutput, *pvector, *pinvec, *poutvec;
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| 31 |
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| 32 | static void convert(void)
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| 33 | {
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| 34 | int read_chars = 0, in_index = 0, out_index = 0, c, coded, last = -1;
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| 35 |
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| 36 | for (;;) {
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| 37 | // If we're out of input, flush output and read more input.
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| 38 |
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| 39 | if (in_index == read_chars) {
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| 40 | if (out_index) {
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| 41 | if (write(1, (char *) poutput, out_index) != out_index)
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| 42 | bb_error_msg_and_die(bb_msg_write_error);
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| 43 | out_index = 0;
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| 44 | }
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| 45 |
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| 46 | if ((read_chars = read(0, bb_common_bufsiz1, BUFSIZ)) <= 0) {
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| 47 | if (write(1, (char *) poutput, out_index) != out_index)
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| 48 | bb_error_msg(bb_msg_write_error);
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| 49 | exit(0);
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| 50 | }
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| 51 | in_index = 0;
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| 52 | }
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| 53 | c = bb_common_bufsiz1[in_index++];
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| 54 | coded = pvector[c];
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| 55 | if (del_fl && pinvec[c])
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| 56 | continue;
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| 57 | if (sq_fl && last == coded && (pinvec[c] || poutvec[coded]))
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| 58 | continue;
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| 59 | poutput[out_index++] = last = coded;
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| 60 | }
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| 61 |
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| 62 | /* NOTREACHED */
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| 63 | }
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| 64 |
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| 65 | static void map(char *string1, unsigned int string1_len,
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| 66 | char *string2, unsigned int string2_len)
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| 67 | {
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| 68 | char last = '0';
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| 69 | unsigned int i, j;
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| 70 |
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| 71 | for (j = 0, i = 0; i < string1_len; i++) {
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| 72 | if (string2_len <= j)
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| 73 | pvector[(GCC4_IS_STUPID)string1[i]] = last;
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| 74 | else
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| 75 | pvector[(GCC4_IS_STUPID)string1[i]] = last = string2[j++];
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| 76 | }
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| 77 | }
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| 78 |
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| 79 | /* supported constructs:
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| 80 | * Ranges, e.g., [0-9] ==> 0123456789
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| 81 | * Escapes, e.g., \a ==> Control-G
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| 82 | * Character classes, e.g. [:upper:] ==> A ... Z
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| 83 | */
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| 84 | static unsigned int expand(const char *arg, char *buffer)
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| 85 | {
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| 86 | char *buffer_start = buffer;
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| 87 | int i, ac;
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| 88 |
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| 89 | while (*arg) {
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| 90 | if (*arg == '\\') {
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| 91 | arg++;
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| 92 | *buffer++ = bb_process_escape_sequence(&arg);
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| 93 | } else if (*(arg+1) == '-') {
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| 94 | ac = *(arg+2);
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| 95 | if(ac == 0) {
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| 96 | *buffer++ = *arg++;
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| 97 | continue;
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| 98 | }
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| 99 | i = *arg;
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| 100 | while (i <= ac)
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| 101 | *buffer++ = i++;
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| 102 | arg += 3; /* Skip the assumed a-z */
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| 103 | } else if (*arg == '[') {
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| 104 | arg++;
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| 105 | i = *arg++;
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| 106 | if (ENABLE_FEATURE_TR_CLASSES && i == ':') {
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| 107 | if (strncmp(arg, "alpha", 5) == 0) {
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| 108 | for (i = 'A'; i <= 'Z'; i++)
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| 109 | *buffer++ = i;
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| 110 | for (i = 'a'; i <= 'z'; i++)
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| 111 | *buffer++ = i;
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| 112 | }
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| 113 | else if (strncmp(arg, "alnum", 5) == 0) {
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| 114 | for (i = '0'; i <= '9'; i++)
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| 115 | *buffer++ = i;
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| 116 | for (i = 'A'; i <= 'Z'; i++)
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| 117 | *buffer++ = i;
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| 118 | for (i = 'a'; i <= 'z'; i++)
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| 119 | *buffer++ = i;
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| 120 | }
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| 121 | else if (strncmp(arg, "digit", 5) == 0)
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| 122 | for (i = '0'; i <= '9'; i++)
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| 123 | *buffer++ = i;
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| 124 | else if (strncmp(arg, "lower", 5) == 0)
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| 125 | for (i = 'a'; i <= 'z'; i++)
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| 126 | *buffer++ = i;
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| 127 | else if (strncmp(arg, "upper", 5) == 0)
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| 128 | for (i = 'A'; i <= 'Z'; i++)
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| 129 | *buffer++ = i;
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| 130 | else if (strncmp(arg, "space", 5) == 0) {
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| 131 | const char s[] = "\t\n\v\f\r ";
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| 132 | strcat((char*)buffer, s);
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| 133 | buffer += sizeof(s) - 1;
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| 134 | }
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| 135 | else if (strncmp(arg, "blank", 5) == 0) {
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| 136 | *buffer++ = '\t';
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| 137 | *buffer++ = ' ';
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| 138 | }
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| 139 | /* gcc gives a warning if braces aren't used here */
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| 140 | else if (strncmp(arg, "punct", 5) == 0) {
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| 141 | for (i = 0; i <= ASCII; i++)
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| 142 | if (isprint(i) && (!isalnum(i)) && (!isspace(i)))
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| 143 | *buffer++ = i;
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| 144 | }
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| 145 | else if (strncmp(arg, "cntrl", 5) == 0) {
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| 146 | for (i = 0; i <= ASCII; i++)
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| 147 | if (iscntrl(i))
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| 148 | *buffer++ = i;
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| 149 | }
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| 150 | else {
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| 151 | *buffer++ = '[';
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| 152 | *buffer++ = ':';
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| 153 | continue;
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| 154 | }
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| 155 | break;
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| 156 | }
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| 157 | if (ENABLE_FEATURE_TR_EQUIV && i == '=') {
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| 158 | *buffer++ = *arg;
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| 159 | /* skip the closing =] */
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| 160 | arg += 3;
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| 161 | continue;
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| 162 | }
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| 163 | if (*arg++ != '-') {
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| 164 | *buffer++ = '[';
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| 165 | arg -= 2;
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| 166 | continue;
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| 167 | }
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| 168 | ac = *arg++;
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| 169 | while (i <= ac)
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| 170 | *buffer++ = i++;
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| 171 | arg++; /* Skip the assumed ']' */
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| 172 | } else
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| 173 | *buffer++ = *arg++;
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| 174 | }
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| 175 |
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| 176 | return (buffer - buffer_start);
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| 177 | }
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| 178 |
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| 179 | static int complement(char *buffer, int buffer_len)
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| 180 | {
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| 181 | register short i, j, ix;
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| 182 | char conv[ASCII + 2];
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| 183 |
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| 184 | ix = 0;
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| 185 | for (i = 0; i <= ASCII; i++) {
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| 186 | for (j = 0; j < buffer_len; j++)
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| 187 | if (buffer[j] == i)
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| 188 | break;
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| 189 | if (j == buffer_len)
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| 190 | conv[ix++] = i & ASCII;
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| 191 | }
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| 192 | memcpy(buffer, conv, ix);
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| 193 | return ix;
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| 194 | }
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| 195 |
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| 196 | int tr_main(int argc, char **argv)
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| 197 | {
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| 198 | register unsigned char *ptr;
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| 199 | int output_length=0, input_length;
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| 200 | int idx = 1;
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| 201 | int i;
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| 202 | RESERVE_CONFIG_BUFFER(output, BUFSIZ);
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| 203 | RESERVE_CONFIG_BUFFER(vector, ASCII+1);
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| 204 | RESERVE_CONFIG_BUFFER(invec, ASCII+1);
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| 205 | RESERVE_CONFIG_BUFFER(outvec, ASCII+1);
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| 206 |
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| 207 | /* ... but make them available globally */
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| 208 | poutput = output;
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| 209 | pvector = vector;
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| 210 | pinvec = invec;
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| 211 | poutvec = outvec;
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| 212 |
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| 213 | if (argc > 1 && argv[idx][0] == '-') {
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| 214 | for (ptr = (unsigned char *) &argv[idx][1]; *ptr; ptr++) {
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| 215 | switch (*ptr) {
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| 216 | case 'c':
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| 217 | com_fl = TRUE;
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| 218 | break;
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| 219 | case 'd':
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| 220 | del_fl = TRUE;
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| 221 | break;
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| 222 | case 's':
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| 223 | sq_fl = TRUE;
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| 224 | break;
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| 225 | default:
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| 226 | bb_show_usage();
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| 227 | }
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| 228 | }
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| 229 | idx++;
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| 230 | }
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| 231 | for (i = 0; i <= ASCII; i++) {
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| 232 | vector[i] = i;
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| 233 | invec[i] = outvec[i] = FALSE;
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| 234 | }
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| 235 |
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| 236 | if (argv[idx] != NULL) {
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| 237 | input_length = expand(argv[idx++], bb_common_bufsiz1);
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| 238 | if (com_fl)
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| 239 | input_length = complement(bb_common_bufsiz1, input_length);
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| 240 | if (argv[idx] != NULL) {
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| 241 | if (*argv[idx] == '\0')
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| 242 | bb_error_msg_and_die("STRING2 cannot be empty");
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| 243 | output_length = expand(argv[idx], output);
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| 244 | map(bb_common_bufsiz1, input_length, output, output_length);
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| 245 | }
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| 246 | for (i = 0; i < input_length; i++)
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| 247 | invec[(GCC4_IS_STUPID)bb_common_bufsiz1[i]] = TRUE;
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| 248 | for (i = 0; i < output_length; i++)
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| 249 | outvec[(GCC4_IS_STUPID)output[i]] = TRUE;
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| 250 | }
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| 251 | convert();
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| 252 | return (0);
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| 253 | }
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