1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * wc implementation for busybox
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4 | *
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5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | /* BB_AUDIT SUSv3 compliant. */
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11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/wc.html */
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12 |
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13 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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14 | *
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15 | * Rewritten to fix a number of problems and do some size optimizations.
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16 | * Problems in the previous busybox implementation (besides bloat) included:
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17 | * 1) broken 'wc -c' optimization (read note below)
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18 | * 2) broken handling of '-' args
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19 | * 3) no checking of ferror on EOF returns
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20 | * 4) isprint() wasn't considered when word counting.
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21 | *
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22 | * NOTES:
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23 | *
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24 | * The previous busybox wc attempted an optimization using stat for the
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25 | * case of counting chars only. I omitted that because it was broken.
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26 | * It didn't take into account the possibility of input coming from a
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27 | * pipe, or input from a file with file pointer not at the beginning.
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28 | *
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29 | * To implement such a speed optimization correctly, not only do you
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30 | * need the size, but also the file position. Note also that the
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31 | * file position may be past the end of file. Consider the example
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32 | * (adapted from example in gnu wc.c)
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33 | *
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34 | * echo hello > /tmp/testfile &&
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35 | * (dd ibs=1k skip=1 count=0 &> /dev/null; wc -c) < /tmp/testfile
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36 | *
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37 | * for which 'wc -c' should output '0'.
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38 | */
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39 | #include "libbb.h"
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40 | #include "unicode.h"
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41 |
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42 | #if !ENABLE_LOCALE_SUPPORT
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43 | # undef isprint
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44 | # undef isspace
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45 | # define isprint(c) ((unsigned)((c) - 0x20) <= (0x7e - 0x20))
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46 | # define isspace(c) ((c) == ' ')
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47 | #endif
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48 |
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49 | #if ENABLE_FEATURE_WC_LARGE
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50 | # define COUNT_T unsigned long long
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51 | # define COUNT_FMT "llu"
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52 | #else
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53 | # define COUNT_T unsigned
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54 | # define COUNT_FMT "u"
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55 | #endif
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56 |
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57 | /* We support -m even when UNICODE_SUPPORT is off,
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58 | * we just don't advertise it in help text,
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59 | * since it is the same as -c in this case.
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60 | */
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61 |
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62 | //usage:#define wc_trivial_usage
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63 | //usage: "[-c"IF_UNICODE_SUPPORT("m")"lwL] [FILE]..."
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64 | //usage:
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65 | //usage:#define wc_full_usage "\n\n"
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66 | //usage: "Count lines, words, and bytes for each FILE (or stdin)\n"
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67 | //usage: "\nOptions:"
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68 | //usage: "\n -c Count bytes"
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69 | //usage: IF_UNICODE_SUPPORT(
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70 | //usage: "\n -m Count characters"
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71 | //usage: )
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72 | //usage: "\n -l Count newlines"
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73 | //usage: "\n -w Count words"
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74 | //usage: "\n -L Print longest line length"
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75 | //usage:
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76 | //usage:#define wc_example_usage
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77 | //usage: "$ wc /etc/passwd\n"
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78 | //usage: " 31 46 1365 /etc/passwd\n"
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79 |
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80 | /* Order is important if we want to be compatible with
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81 | * column order in "wc -cmlwL" output:
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82 | */
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83 | enum {
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84 | WC_LINES = 0, /* -l */
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85 | WC_WORDS = 1, /* -w */
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86 | WC_UNICHARS = 2, /* -m */
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87 | WC_BYTES = 3, /* -c */
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88 | WC_LENGTH = 4, /* -L */
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89 | NUM_WCS = 5,
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90 | };
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91 |
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92 | int wc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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93 | int wc_main(int argc UNUSED_PARAM, char **argv)
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94 | {
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95 | const char *arg;
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96 | const char *start_fmt = " %9"COUNT_FMT + 1;
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97 | const char *fname_fmt = " %s\n";
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98 | COUNT_T *pcounts;
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99 | COUNT_T counts[NUM_WCS];
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100 | COUNT_T totals[NUM_WCS];
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101 | int num_files;
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102 | smallint status = EXIT_SUCCESS;
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103 | unsigned print_type;
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104 |
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105 | init_unicode();
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106 |
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107 | print_type = getopt32(argv, "lwmcL");
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108 |
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109 | if (print_type == 0) {
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110 | print_type = (1 << WC_LINES) | (1 << WC_WORDS) | (1 << WC_BYTES);
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111 | }
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112 |
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113 | argv += optind;
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114 | if (!argv[0]) {
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115 | *--argv = (char *) bb_msg_standard_input;
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116 | fname_fmt = "\n";
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117 | }
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118 | if (!argv[1]) { /* zero or one filename? */
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119 | if (!((print_type-1) & print_type)) /* exactly one option? */
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120 | start_fmt = "%"COUNT_FMT;
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121 | }
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122 |
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123 | memset(totals, 0, sizeof(totals));
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124 |
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125 | pcounts = counts;
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126 |
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127 | num_files = 0;
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128 | while ((arg = *argv++) != NULL) {
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129 | FILE *fp;
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130 | const char *s;
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131 | unsigned u;
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132 | unsigned linepos;
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133 | smallint in_word;
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134 |
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135 | ++num_files;
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136 | fp = fopen_or_warn_stdin(arg);
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137 | if (!fp) {
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138 | status = EXIT_FAILURE;
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139 | continue;
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140 | }
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141 |
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142 | memset(counts, 0, sizeof(counts));
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143 | linepos = 0;
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144 | in_word = 0;
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145 |
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146 | while (1) {
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147 | int c;
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148 | /* Our -w doesn't match GNU wc exactly... oh well */
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149 |
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150 | c = getc(fp);
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151 | if (c == EOF) {
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152 | if (ferror(fp)) {
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153 | bb_simple_perror_msg(arg);
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154 | status = EXIT_FAILURE;
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155 | }
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156 | goto DO_EOF; /* Treat an EOF as '\r'. */
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157 | }
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158 |
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159 | /* Cater for -c and -m */
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160 | ++counts[WC_BYTES];
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161 | if (unicode_status != UNICODE_ON /* every byte is a new char */
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162 | || (c & 0xc0) != 0x80 /* it isn't a 2nd+ byte of a Unicode char */
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163 | ) {
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164 | ++counts[WC_UNICHARS];
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165 | }
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166 |
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167 | if (isprint_asciionly(c)) { /* FIXME: not unicode-aware */
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168 | ++linepos;
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169 | if (!isspace(c)) {
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170 | in_word = 1;
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171 | continue;
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172 | }
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173 | } else if ((unsigned)(c - 9) <= 4) {
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174 | /* \t 9
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175 | * \n 10
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176 | * \v 11
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177 | * \f 12
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178 | * \r 13
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179 | */
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180 | if (c == '\t') {
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181 | linepos = (linepos | 7) + 1;
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182 | } else { /* '\n', '\r', '\f', or '\v' */
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183 | DO_EOF:
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184 | if (linepos > counts[WC_LENGTH]) {
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185 | counts[WC_LENGTH] = linepos;
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186 | }
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187 | if (c == '\n') {
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188 | ++counts[WC_LINES];
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189 | }
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190 | if (c != '\v') {
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191 | linepos = 0;
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192 | }
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193 | }
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194 | } else {
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195 | continue;
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196 | }
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197 |
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198 | counts[WC_WORDS] += in_word;
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199 | in_word = 0;
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200 | if (c == EOF) {
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201 | break;
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202 | }
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203 | }
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204 |
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205 | fclose_if_not_stdin(fp);
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206 |
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207 | if (totals[WC_LENGTH] < counts[WC_LENGTH]) {
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208 | totals[WC_LENGTH] = counts[WC_LENGTH];
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209 | }
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210 | totals[WC_LENGTH] -= counts[WC_LENGTH];
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211 |
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212 | OUTPUT:
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213 | /* coreutils wc tries hard to print pretty columns
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214 | * (saves results for all files, finds max col len etc...)
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215 | * we won't try that hard, it will bloat us too much */
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216 | s = start_fmt;
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217 | u = 0;
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218 | do {
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219 | if (print_type & (1 << u)) {
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220 | printf(s, pcounts[u]);
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221 | s = " %9"COUNT_FMT; /* Ok... restore the leading space. */
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222 | }
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223 | totals[u] += pcounts[u];
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224 | } while (++u < NUM_WCS);
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225 | printf(fname_fmt, arg);
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226 | }
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227 |
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228 | /* If more than one file was processed, we want the totals. To save some
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229 | * space, we set the pcounts ptr to the totals array. This has the side
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230 | * effect of trashing the totals array after outputting it, but that's
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231 | * irrelavent since we no longer need it. */
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232 | if (num_files > 1) {
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233 | num_files = 0; /* Make sure we don't get here again. */
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234 | arg = "total";
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235 | pcounts = totals;
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236 | --argv;
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237 | goto OUTPUT;
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238 | }
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239 |
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240 | fflush_stdout_and_exit(status);
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241 | }
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