Mercurial > hg > toybox
annotate toys/posix/sort.c @ 1736:5892daac85ab draft
Switch nsenter to default y.
author | Rob Landley <rob@landley.net> |
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date | Thu, 12 Mar 2015 15:34:03 -0500 |
parents | cb62f7090473 |
children | 052b608826a3 |
rev | line source |
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1 /* sort.c - put input lines into order |
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2 * |
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3 * Copyright 2004, 2008 Rob Landley <rob@landley.net> |
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4 * |
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5 * See http://opengroup.org/onlinepubs/007904975/utilities/sort.html |
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6 |
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7 USE_SORT(NEWTOY(sort, USE_SORT_FLOAT("g")USE_SORT_BIG("S:T:m" "o:k*t:xbMcszdfi") "run", TOYFLAG_USR|TOYFLAG_BIN)) |
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8 |
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9 config SORT |
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10 bool "sort" |
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11 default y |
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12 help |
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13 usage: sort [-run] [FILE...] |
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14 |
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15 Sort all lines of text from input files (or stdin) to stdout. |
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16 |
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17 -r reverse |
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18 -u unique lines only |
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19 -n numeric order (instead of alphabetical) |
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20 |
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21 config SORT_BIG |
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22 bool "SuSv3 options (Support -ktcsbdfiozM)" |
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23 default y |
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24 depends on SORT |
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25 help |
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26 usage: sort [-bcdfiMsz] [-k#[,#[x]] [-t X]] [-o FILE] |
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27 |
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28 -b ignore leading blanks (or trailing blanks in second part of key) |
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29 -c check whether input is sorted |
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30 -d dictionary order (use alphanumeric and whitespace chars only) |
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31 -f force uppercase (case insensitive sort) |
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32 -i ignore nonprinting characters |
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33 -M month sort (jan, feb, etc). |
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34 -x Hexadecimal numerical sort |
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35 -s skip fallback sort (only sort with keys) |
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36 -z zero (null) terminated input |
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37 -k sort by "key" (see below) |
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38 -t use a key separator other than whitespace |
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39 -o output to FILE instead of stdout |
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40 |
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41 Sorting by key looks at a subset of the words on each line. -k2 |
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42 uses the second word to the end of the line, -k2,2 looks at only |
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43 the second word, -k2,4 looks from the start of the second to the end |
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44 of the fourth word. Specifying multiple keys uses the later keys as |
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45 tie breakers, in order. A type specifier appended to a sort key |
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46 (such as -2,2n) applies only to sorting that key. |
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47 |
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48 config SORT_FLOAT |
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49 bool "Floating point (-g)" |
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50 default y |
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51 depends on SORT_BIG |
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52 help |
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53 usage: sort [-g] |
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54 |
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55 -g general numeric sort (double precision with nan and inf) |
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56 |
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57 This version of sort requires floating point. |
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58 */ |
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59 |
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60 #define FOR_sort |
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61 #include "toys.h" |
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62 |
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63 GLOBALS( |
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64 char *key_separator; |
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65 struct arg_list *raw_keys; |
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66 char *outfile; |
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67 char *ignore1, ignore2; // GNU compatability NOPs for -S and -T. |
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68 |
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69 void *key_list; |
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70 int linecount; |
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71 char **lines; |
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72 ) |
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73 |
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74 // The sort types are n, g, and M. |
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75 // u, c, s, and z apply to top level only, not to keys. |
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76 // b at top level implies bb. |
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77 // The remaining options can be applied to search keys. |
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78 |
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79 #define FLAG_bb (1<<31) // Ignore trailing blanks |
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80 |
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81 struct sort_key |
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82 { |
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83 struct sort_key *next_key; // linked list |
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84 unsigned range[4]; // start word, start char, end word, end char |
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85 int flags; |
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86 }; |
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87 |
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88 // Copy of the part of this string corresponding to a key/flags. |
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89 |
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90 static char *get_key_data(char *str, struct sort_key *key, int flags) |
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91 { |
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92 int start=0, end, len, i, j; |
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93 |
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94 // Special case whole string, so we don't have to make a copy |
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95 |
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96 if(key->range[0]==1 && !key->range[1] && !key->range[2] && !key->range[3] |
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97 && !(flags&(FLAG_b&FLAG_d&FLAG_f&FLAG_i&FLAG_bb))) return str; |
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98 |
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99 // Find start of key on first pass, end on second pass |
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100 |
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101 len = strlen(str); |
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102 for (j=0; j<2; j++) { |
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103 if (!key->range[2*j]) end=len; |
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104 |
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105 // Loop through fields |
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106 else { |
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107 end=0; |
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108 for (i=1; i < key->range[2*j]+j; i++) { |
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109 |
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110 // Skip leading blanks |
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111 if (str[end] && !TT.key_separator) |
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112 while (isspace(str[end])) end++; |
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113 |
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114 // Skip body of key |
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115 for (; str[end]; end++) { |
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116 if (TT.key_separator) { |
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117 if (str[end]==*TT.key_separator) break; |
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118 } else if (isspace(str[end])) break; |
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119 } |
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120 } |
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121 } |
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122 if (!j) start=end; |
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123 } |
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124 |
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125 // Key with explicit separator starts after the separator |
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126 if (TT.key_separator && str[start]==*TT.key_separator) start++; |
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127 |
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128 // Strip leading and trailing whitespace if necessary |
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129 if (flags&FLAG_b) while (isspace(str[start])) start++; |
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130 if (flags&FLAG_bb) while (end>start && isspace(str[end-1])) end--; |
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131 |
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132 // Handle offsets on start and end |
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133 if (key->range[3]) { |
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134 end += key->range[3]-1; |
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135 if (end>len) end=len; |
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136 } |
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137 if (key->range[1]) { |
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138 start += key->range[1]-1; |
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139 if (start>len) start=len; |
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140 } |
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141 |
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142 // Make the copy |
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143 if (end<start) end=start; |
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144 str = xstrndup(str+start, end-start); |
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145 |
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146 // Handle -d |
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147 if (flags&FLAG_d) { |
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148 for (start = end = 0; str[end]; end++) |
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149 if (isspace(str[end]) || isalnum(str[end])) str[start++] = str[end]; |
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150 str[start] = 0; |
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151 } |
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152 |
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153 // Handle -i |
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154 if (flags&FLAG_i) { |
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155 for (start = end = 0; str[end]; end++) |
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156 if (isprint(str[end])) str[start++] = str[end]; |
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157 str[start] = 0; |
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158 } |
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159 |
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160 // Handle -f |
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161 if (flags*FLAG_f) for(i=0; str[i]; i++) str[i] = toupper(str[i]); |
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162 |
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163 return str; |
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164 } |
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165 |
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166 // append a sort_key to key_list. |
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167 |
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168 static struct sort_key *add_key(void) |
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169 { |
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170 void **stupid_compiler = &TT.key_list; |
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171 struct sort_key **pkey = (struct sort_key **)stupid_compiler; |
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172 |
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173 while (*pkey) pkey = &((*pkey)->next_key); |
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174 return *pkey = xzalloc(sizeof(struct sort_key)); |
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175 } |
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176 |
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177 // Perform actual comparison |
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178 static int compare_values(int flags, char *x, char *y) |
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179 { |
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180 int ff = flags & (FLAG_n|FLAG_g|FLAG_M|FLAG_x); |
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181 |
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182 // Ascii sort |
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183 if (!ff) return strcmp(x, y); |
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184 |
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185 if (CFG_SORT_FLOAT && ff == FLAG_g) { |
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186 char *xx,*yy; |
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187 double dx = strtod(x,&xx), dy = strtod(y,&yy); |
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188 int xinf, yinf; |
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189 |
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190 // not numbers < NaN < -infinity < numbers < +infinity |
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191 |
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192 if (x==xx) return y==yy ? 0 : -1; |
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193 if (y==yy) return 1; |
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194 |
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195 // Check for isnan |
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196 if (dx!=dx) return (dy!=dy) ? 0 : -1; |
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197 if (dy!=dy) return 1; |
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198 |
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199 // Check for infinity. (Could underflow, but avoids needing libm.) |
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200 xinf = (1.0/dx == 0.0); |
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201 yinf = (1.0/dy == 0.0); |
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202 if (xinf) { |
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203 if(dx<0) return (yinf && dy<0) ? 0 : -1; |
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204 return (yinf && dy>0) ? 0 : 1; |
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205 } |
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206 if (yinf) return dy<0 ? 1 : -1; |
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207 |
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208 return dx>dy ? 1 : (dx<dy ? -1 : 0); |
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209 } else if (CFG_SORT_BIG && ff == FLAG_M) { |
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210 struct tm thyme; |
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211 int dx; |
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212 char *xx,*yy; |
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213 |
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214 xx = strptime(x,"%b",&thyme); |
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215 dx = thyme.tm_mon; |
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216 yy = strptime(y,"%b",&thyme); |
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217 if (!xx) return !yy ? 0 : -1; |
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218 else if (!yy) return 1; |
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219 else return dx==thyme.tm_mon ? 0 : dx-thyme.tm_mon; |
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220 |
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221 } else if (CFG_SORT_BIG && ff == FLAG_x) { |
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222 return strtol(x, NULL, 16)-strtol(y, NULL, 16); |
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223 // This has to be ff == FLAG_n |
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224 } else { |
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225 // Full floating point version of -n |
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226 if (CFG_SORT_FLOAT) { |
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227 double dx = atof(x), dy = atof(y); |
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228 |
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229 return dx>dy ? 1 : (dx<dy ? -1 : 0); |
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230 // Integer version of -n for tiny systems |
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231 } else return atoi(x)-atoi(y); |
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232 } |
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233 } |
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234 |
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235 // Callback from qsort(): Iterate through key_list and perform comparisons. |
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236 static int compare_keys(const void *xarg, const void *yarg) |
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237 { |
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238 int flags = toys.optflags, retval = 0; |
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239 char *x, *y, *xx = *(char **)xarg, *yy = *(char **)yarg; |
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240 struct sort_key *key; |
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241 |
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242 if (CFG_SORT_BIG) { |
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243 for (key=(struct sort_key *)TT.key_list; !retval && key; |
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244 key = key->next_key) |
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245 { |
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246 flags = key->flags ? key->flags : toys.optflags; |
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247 |
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248 // Chop out and modify key chunks, handling -dfib |
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249 |
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250 x = get_key_data(xx, key, flags); |
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251 y = get_key_data(yy, key, flags); |
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253 retval = compare_values(flags, x, y); |
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254 |
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255 // Free the copies get_key_data() made. |
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256 |
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257 if (x != xx) free(x); |
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258 if (y != yy) free(y); |
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259 |
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260 if (retval) break; |
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261 } |
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262 } else retval = compare_values(flags, xx, yy); |
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263 |
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264 // Perform fallback sort if necessary |
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265 if (!retval && !(CFG_SORT_BIG && (toys.optflags&FLAG_s))) { |
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266 retval = strcmp(xx, yy); |
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267 flags = toys.optflags; |
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268 } |
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269 |
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270 return retval * ((flags&FLAG_r) ? -1 : 1); |
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271 } |
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273 // Callback from loopfiles to handle input files. |
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274 static void sort_read(int fd, char *name) |
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275 { |
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276 // Read each line from file, appending to a big array. |
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277 |
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278 for (;;) { |
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279 char * line = (CFG_SORT_BIG && (toys.optflags&FLAG_z)) |
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280 ? get_rawline(fd, NULL, 0) : get_line(fd); |
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281 |
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282 if (!line) break; |
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283 |
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284 // handle -c here so we don't allocate more memory than necessary. |
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285 if (CFG_SORT_BIG && (toys.optflags&FLAG_c)) { |
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286 int j = (toys.optflags&FLAG_u) ? -1 : 0; |
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287 |
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288 if (TT.lines && compare_keys((void *)&TT.lines, &line)>j) |
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289 error_exit("%s: Check line %d\n", name, TT.linecount); |
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290 free(TT.lines); |
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291 TT.lines = (char **)line; |
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292 } else { |
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293 if (!(TT.linecount&63)) |
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294 TT.lines = xrealloc(TT.lines, sizeof(char *)*(TT.linecount+64)); |
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295 TT.lines[TT.linecount] = line; |
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296 } |
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297 TT.linecount++; |
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298 } |
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299 } |
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300 |
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301 void sort_main(void) |
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302 { |
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303 int idx, fd = 1; |
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304 |
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305 // Open output file if necessary. |
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306 if (CFG_SORT_BIG && TT.outfile) |
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307 fd = xcreate(TT.outfile, O_CREAT|O_TRUNC|O_WRONLY, 0666); |
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308 |
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309 // Parse -k sort keys. |
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310 if (CFG_SORT_BIG && TT.raw_keys) { |
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311 struct arg_list *arg; |
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312 |
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313 for (arg = TT.raw_keys; arg; arg = arg->next) { |
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314 struct sort_key *key = add_key(); |
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315 char *temp; |
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316 int flag; |
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317 |
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318 idx = 0; |
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319 temp = arg->arg; |
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320 while (*temp) { |
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321 // Start of range |
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322 key->range[2*idx] = (unsigned)strtol(temp, &temp, 10); |
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323 if (*temp=='.') |
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324 key->range[(2*idx)+1] = (unsigned)strtol(temp+1, &temp, 10); |
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325 |
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326 // Handle flags appended to a key type. |
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327 for (;*temp;temp++) { |
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328 char *temp2, *optlist; |
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329 |
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330 // Note that a second comma becomes an "Unknown key" error. |
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331 |
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332 if (*temp==',' && !idx++) { |
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333 temp++; |
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334 break; |
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335 } |
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337 // Which flag is this? |
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338 |
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339 optlist = toys.which->options; |
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340 temp2 = strchr(optlist, *temp); |
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341 flag = (1<<(optlist-temp2+strlen(optlist)-1)); |
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342 |
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343 // Was it a flag that can apply to a key? |
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344 |
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345 if (!temp2 || flag>FLAG_b |
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346 || (flag&(FLAG_u|FLAG_c|FLAG_s|FLAG_z))) |
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347 { |
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348 error_exit("Unknown key option."); |
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349 } |
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350 // b after , means strip _trailing_ space, not leading. |
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351 if (idx && flag==FLAG_b) flag = FLAG_bb; |
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352 key->flags |= flag; |
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353 } |
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354 } |
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355 } |
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356 } |
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357 |
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358 // global b flag strips both leading and trailing spaces |
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359 if (toys.optflags&FLAG_b) toys.optflags |= FLAG_bb; |
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360 |
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361 // If no keys, perform alphabetic sort over the whole line. |
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362 if (CFG_SORT_BIG && !TT.key_list) add_key()->range[0] = 1; |
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363 |
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364 // Open input files and read data, populating TT.lines[TT.linecount] |
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365 loopfiles(toys.optargs, sort_read); |
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366 |
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367 // The compare (-c) logic was handled in sort_read(), |
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368 // so if we got here, we're done. |
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369 if (CFG_SORT_BIG && (toys.optflags&FLAG_c)) goto exit_now; |
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370 |
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371 // Perform the actual sort |
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372 qsort(TT.lines, TT.linecount, sizeof(char *), compare_keys); |
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373 |
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374 // handle unique (-u) |
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375 if (toys.optflags&FLAG_u) { |
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376 int jdx; |
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377 |
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378 for (jdx=0, idx=1; idx<TT.linecount; idx++) { |
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379 if (!compare_keys(&TT.lines[jdx], &TT.lines[idx])) |
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380 free(TT.lines[idx]); |
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381 else TT.lines[++jdx] = TT.lines[idx]; |
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382 } |
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383 if (TT.linecount) TT.linecount = jdx+1; |
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384 } |
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385 |
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386 // Output result |
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387 for (idx = 0; idx<TT.linecount; idx++) { |
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388 char *s = TT.lines[idx]; |
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389 xwrite(fd, s, strlen(s)); |
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390 if (CFG_TOYBOX_FREE) free(s); |
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391 xwrite(fd, "\n", 1); |
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392 } |
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393 |
433
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394 exit_now: |
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395 if (CFG_TOYBOX_FREE) { |
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396 if (fd != 1) close(fd); |
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397 free(TT.lines); |
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398 } |
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399 } |