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 source tree.
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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 | #include "libbb.h"
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24 | #include "unicode.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 | #if ENABLE_EXPAND
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33 | static void expand(FILE *file, unsigned tab_size, unsigned opt)
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34 | {
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35 | char *line;
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36 |
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37 | while ((line = xmalloc_fgets(file)) != NULL) {
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38 | unsigned char c;
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39 | char *ptr;
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40 | char *ptr_strbeg;
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41 |
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42 | ptr = ptr_strbeg = line;
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43 | while ((c = *ptr) != '\0') {
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44 | if ((opt & OPT_INITIAL) && !isblank(c)) {
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45 | /* not space or tab */
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46 | break;
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47 | }
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48 | if (c == '\t') {
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49 | unsigned len;
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50 | *ptr = '\0';
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51 | # if ENABLE_UNICODE_SUPPORT
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52 | {
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53 | uni_stat_t uni_stat;
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54 | printable_string(&uni_stat, ptr_strbeg);
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55 | len = uni_stat.unicode_width;
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56 | }
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57 | # else
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58 | len = ptr - ptr_strbeg;
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59 | # endif
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60 | len = tab_size - (len % tab_size);
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61 | /*while (ptr[1] == '\t') { ptr++; len += tab_size; } - can handle many tabs at once */
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62 | printf("%s%*s", ptr_strbeg, len, "");
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63 | ptr_strbeg = ptr + 1;
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64 | }
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65 | ptr++;
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66 | }
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67 | fputs(ptr_strbeg, stdout);
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68 | free(line);
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69 | }
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70 | }
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71 | #endif
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72 |
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73 | #if ENABLE_UNEXPAND
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74 | static void unexpand(FILE *file, unsigned tab_size, unsigned opt)
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75 | {
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76 | char *line;
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77 |
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78 | while ((line = xmalloc_fgets(file)) != NULL) {
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79 | char *ptr = line;
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80 | unsigned column = 0;
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81 |
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82 | while (*ptr) {
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83 | unsigned n;
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84 | unsigned len = 0;
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85 |
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86 | while (*ptr == ' ') {
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87 | ptr++;
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88 | len++;
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89 | }
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90 | column += len;
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91 | if (*ptr == '\t') {
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92 | column += tab_size - (column % tab_size);
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93 | ptr++;
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94 | continue;
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95 | }
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96 |
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97 | n = column / tab_size;
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98 | if (n) {
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99 | len = column = column % tab_size;
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100 | while (n--)
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101 | putchar('\t');
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102 | }
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103 |
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104 | if ((opt & OPT_INITIAL) && ptr != line) {
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105 | printf("%*s%s", len, "", ptr);
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106 | break;
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107 | }
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108 | n = strcspn(ptr, "\t ");
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109 | printf("%*s%.*s", len, "", n, ptr);
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110 | # if ENABLE_UNICODE_SUPPORT
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111 | {
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112 | char c;
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113 | uni_stat_t uni_stat;
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114 | c = ptr[n];
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115 | ptr[n] = '\0';
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116 | printable_string(&uni_stat, ptr);
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117 | len = uni_stat.unicode_width;
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118 | ptr[n] = c;
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119 | }
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120 | # else
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121 | len = n;
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122 | # endif
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123 | ptr += n;
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124 | column = (column + len) % tab_size;
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125 | }
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126 | free(line);
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127 | }
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128 | }
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129 | #endif
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130 |
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131 | int expand_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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132 | int expand_main(int argc UNUSED_PARAM, char **argv)
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133 | {
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134 | /* Default 8 spaces for 1 tab */
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135 | const char *opt_t = "8";
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136 | FILE *file;
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137 | unsigned tab_size;
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138 | unsigned opt;
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139 | int exit_status = EXIT_SUCCESS;
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140 |
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141 | #if ENABLE_FEATURE_EXPAND_LONG_OPTIONS
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142 | static const char expand_longopts[] ALIGN1 =
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143 | /* name, has_arg, val */
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144 | "initial\0" No_argument "i"
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145 | "tabs\0" Required_argument "t"
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146 | ;
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147 | #endif
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148 | #if ENABLE_FEATURE_UNEXPAND_LONG_OPTIONS
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149 | static const char unexpand_longopts[] ALIGN1 =
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150 | /* name, has_arg, val */
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151 | "first-only\0" No_argument "i"
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152 | "tabs\0" Required_argument "t"
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153 | "all\0" No_argument "a"
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154 | ;
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155 | #endif
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156 | init_unicode();
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157 |
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158 | if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e')) {
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159 | IF_FEATURE_EXPAND_LONG_OPTIONS(applet_long_options = expand_longopts);
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160 | opt = getopt32(argv, "it:", &opt_t);
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161 | } else {
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162 | IF_FEATURE_UNEXPAND_LONG_OPTIONS(applet_long_options = unexpand_longopts);
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163 | /* -t NUM sets also -a */
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164 | opt_complementary = "ta";
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165 | opt = getopt32(argv, "ft:a", &opt_t);
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166 | /* -f --first-only is the default */
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167 | if (!(opt & OPT_ALL)) opt |= OPT_INITIAL;
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168 | }
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169 | tab_size = xatou_range(opt_t, 1, UINT_MAX);
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170 |
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171 | argv += optind;
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172 |
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173 | if (!*argv) {
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174 | *--argv = (char*)bb_msg_standard_input;
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175 | }
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176 | do {
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177 | file = fopen_or_warn_stdin(*argv);
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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 |
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183 | if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e'))
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184 | IF_EXPAND(expand(file, tab_size, opt));
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185 | else
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186 | IF_UNEXPAND(unexpand(file, tab_size, opt));
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187 |
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188 | /* Check and close the file */
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189 | if (fclose_if_not_stdin(file)) {
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190 | bb_simple_perror_msg(*argv);
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191 | exit_status = EXIT_FAILURE;
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192 | }
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193 | /* If stdin also clear EOF */
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194 | if (file == stdin)
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195 | clearerr(file);
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196 | } while (*++argv);
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197 |
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198 | /* Now close stdin also */
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199 | /* (if we didn't read from it, it's a no-op) */
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200 | if (fclose(stdin))
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201 | bb_perror_msg_and_die(bb_msg_standard_input);
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202 |
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203 | fflush_stdout_and_exit(exit_status);
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204 | }
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