1 | /* expand - convert tabs to spaces
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2 | * unexpand - convert spaces to tabs
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3 | *
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4 | * Copyright (C) 89, 91, 1995-2006 Free Software Foundation, Inc.
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5 | *
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6 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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7 | *
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8 | * David MacKenzie <djm@gnu.ai.mit.edu>
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9 | *
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10 | * Options for expand:
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11 | * -t num --tabs=NUM Convert tabs to num spaces (default 8 spaces).
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12 | * -i --initial Only convert initial tabs on each line to spaces.
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13 | *
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14 | * Options for unexpand:
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15 | * -a --all Convert all blanks, instead of just initial blanks.
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16 | * -f --first-only Convert only leading sequences of blanks (default).
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17 | * -t num --tabs=NUM Have tabs num characters apart instead of 8.
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18 | *
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19 | * Busybox version (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
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20 | *
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21 | * Caveat: this versions of expand and unexpand don't accept tab lists.
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22 | */
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23 |
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24 | #include "libbb.h"
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25 |
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26 | enum {
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27 | OPT_INITIAL = 1 << 0,
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28 | OPT_TABS = 1 << 1,
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29 | OPT_ALL = 1 << 2,
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30 | };
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31 |
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32 | static void xputchar(char c)
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33 | {
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34 | if (putchar(c) < 0)
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35 | bb_error_msg_and_die(bb_msg_write_error);
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36 | }
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37 |
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38 | #if ENABLE_EXPAND
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39 | static void expand(FILE *file, unsigned tab_size, unsigned opt)
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40 | {
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41 | char *line;
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42 | char *ptr;
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43 | int convert;
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44 | int pos;
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45 |
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46 | /* Increment tab_size by 1 locally.*/
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47 | tab_size++;
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48 |
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49 | while ((line = xmalloc_fgets(file)) != NULL) {
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50 | convert = 1;
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51 | pos = 0;
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52 | ptr = line;
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53 | while (*line) {
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54 | pos++;
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55 | if (*line == '\t' && convert) {
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56 | for (; pos < tab_size; pos++) {
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57 | xputchar(' ');
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58 | }
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59 | } else {
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60 | if ((opt & OPT_INITIAL) && !isblank(*line)) {
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61 | convert = 0;
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62 | }
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63 | xputchar(*line);
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64 | }
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65 | if (pos == tab_size) {
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66 | pos = 0;
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67 | }
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68 | line++;
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69 | }
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70 | free(ptr);
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71 | }
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72 | }
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73 | #endif
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74 |
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75 | #if ENABLE_UNEXPAND
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76 | static void unexpand(FILE *file, unsigned int tab_size, unsigned opt)
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77 | {
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78 | char *line;
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79 | char *ptr;
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80 | int convert;
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81 | int pos;
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82 | int i = 0;
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83 | int column = 0;
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84 |
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85 | while ((line = xmalloc_fgets(file)) != NULL) {
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86 | convert = 1;
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87 | pos = 0;
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88 | ptr = line;
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89 | while (*line) {
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90 | while ((*line == ' ' || *line == '\t') && convert) {
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91 | pos += (*line == ' ') ? 1 : tab_size;
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92 | line++;
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93 | column++;
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94 | if ((opt & OPT_ALL) && column == tab_size) {
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95 | column = 0;
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96 | goto put_tab;
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97 | }
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98 | }
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99 | if (pos) {
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100 | i = pos / tab_size;
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101 | if (i) {
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102 | for (; i > 0; i--) {
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103 | put_tab:
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104 | xputchar('\t');
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105 | }
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106 | } else {
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107 | for (i = pos % tab_size; i > 0; i--) {
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108 | xputchar(' ');
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109 | }
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110 | }
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111 | pos = 0;
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112 | } else {
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113 | if (opt & OPT_INITIAL) {
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114 | convert = 0;
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115 | }
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116 | if (opt & OPT_ALL) {
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117 | column++;
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118 | }
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119 | xputchar(*line);
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120 | line++;
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121 | }
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122 | }
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123 | free(ptr);
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124 | }
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125 | }
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126 | #endif
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127 |
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128 | int expand_main(int argc, char **argv);
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129 | int expand_main(int argc, char **argv)
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130 | {
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131 | /* Default 8 spaces for 1 tab */
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132 | const char *opt_t = "8";
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133 | FILE *file;
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134 | unsigned tab_size;
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135 | unsigned opt;
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136 | int exit_status = EXIT_SUCCESS;
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137 |
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138 | #if ENABLE_FEATURE_EXPAND_LONG_OPTIONS
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139 | static const char expand_longopts[] ALIGN1 =
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140 | /* name, has_arg, val */
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141 | "initial\0" No_argument "i"
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142 | "tabs\0" Required_argument "t"
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143 | ;
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144 | #endif
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145 | #if ENABLE_FEATURE_UNEXPAND_LONG_OPTIONS
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146 | static const char unexpand_longopts[] ALIGN1 =
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147 | /* name, has_arg, val */
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148 | "first-only\0" No_argument "i"
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149 | "tabs\0" Required_argument "t"
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150 | "all\0" No_argument "a"
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151 | ;
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152 | #endif
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153 |
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154 | if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e')) {
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155 | USE_FEATURE_EXPAND_LONG_OPTIONS(applet_long_options = expand_longopts);
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156 | opt = getopt32(argv, "it:", &opt_t);
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157 | } else if (ENABLE_UNEXPAND) {
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158 | USE_FEATURE_UNEXPAND_LONG_OPTIONS(applet_long_options = unexpand_longopts);
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159 | /* -t NUM sets also -a */
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160 | opt_complementary = "ta";
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161 | opt = getopt32(argv, "ft:a", &opt_t);
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162 | /* -f --first-only is the default */
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163 | if (!(opt & OPT_ALL)) opt |= OPT_INITIAL;
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164 | }
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165 | tab_size = xatou_range(opt_t, 1, UINT_MAX);
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166 |
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167 | argv += optind;
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168 |
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169 | /* If no args are given, read from stdin */
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170 | if (!*argv) {
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171 | *--argv = (char*)bb_msg_standard_input;
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172 | goto use_stdin;
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173 | }
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174 |
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175 | do {
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176 | if (NOT_LONE_CHAR(*argv, '-')) {
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177 | file = fopen_or_warn(*argv, "r");
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178 | if (!file) {
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179 | exit_status = EXIT_FAILURE;
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180 | continue;
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181 | }
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182 | } else {
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183 | use_stdin:
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184 | file = stdin;
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185 | }
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186 |
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187 | if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e'))
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188 | USE_EXPAND(expand(file, tab_size, opt));
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189 | else if (ENABLE_UNEXPAND)
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190 | USE_UNEXPAND(unexpand(file, tab_size, opt));
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191 |
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192 | /* Check and close the file */
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193 | /* We do want all of them to execute, thus | instead of || */
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194 | if (ferror(file) | fclose_if_not_stdin(file)) {
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195 | bb_perror_msg("%s", *argv);
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196 | exit_status = EXIT_FAILURE;
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197 | }
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198 | /* If stdin also clear EOF */
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199 | if (file == stdin)
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200 | clearerr(file);
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201 | } while (*++argv);
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202 |
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203 | /* Now close stdin also */
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204 | /* (if we didn't read from it, it's a no-op) */
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205 | if (fclose(stdin))
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206 | bb_perror_msg_and_die(bb_msg_standard_input);
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207 |
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208 | fflush_stdout_and_exit(exit_status);
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209 | }
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