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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