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 | * This program is free software; you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation; either version 2 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * This program is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 | * General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with this program; if not, write to the Free Software
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19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 | *
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21 | */
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22 |
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23 | /* BB_AUDIT SUSv3 _NOT_ compliant -- option -m is not currently supported. */
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24 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/wc.html */
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25 |
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26 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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27 | *
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28 | * Rewritten to fix a number of problems and do some size optimizations.
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29 | * Problems in the previous busybox implementation (besides bloat) included:
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30 | * 1) broken 'wc -c' optimization (read note below)
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31 | * 2) broken handling of '-' args
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32 | * 3) no checking of ferror on EOF returns
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33 | * 4) isprint() wasn't considered when word counting.
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34 | *
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35 | * TODO:
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36 | *
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37 | * When locale support is enabled, count multibyte chars in the '-m' case.
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38 | *
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39 | * NOTES:
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40 | *
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41 | * The previous busybox wc attempted an optimization using stat for the
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42 | * case of counting chars only. I omitted that because it was broken.
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43 | * It didn't take into account the possibility of input coming from a
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44 | * pipe, or input from a file with file pointer not at the beginning.
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45 | *
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46 | * To implement such a speed optimization correctly, not only do you
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47 | * need the size, but also the file position. Note also that the
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48 | * file position may be past the end of file. Consider the example
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49 | * (adapted from example in gnu wc.c)
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50 | *
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51 | * echo hello > /tmp/testfile &&
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52 | * (dd ibs=1k skip=1 count=0 &> /dev/null ; wc -c) < /tmp/testfile
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53 | *
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54 | * for which 'wc -c' should output '0'.
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55 | */
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56 |
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57 | #include <stdio.h>
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58 | #include <stdlib.h>
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59 | #include <string.h>
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60 | #include <unistd.h>
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61 | #include "busybox.h"
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62 |
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63 | #ifdef CONFIG_LOCALE_SUPPORT
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64 | #include <locale.h>
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65 | #include <ctype.h>
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66 | #define isspace_given_isprint(c) isspace(c)
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67 | #else
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68 | #undef isspace
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69 | #undef isprint
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70 | #define isspace(c) ((((c) == ' ') || (((unsigned int)((c) - 9)) <= (13 - 9))))
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71 | #define isprint(c) (((unsigned int)((c) - 0x20)) <= (0x7e - 0x20))
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72 | #define isspace_given_isprint(c) ((c) == ' ')
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73 | #endif
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74 |
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75 | enum {
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76 | WC_LINES = 0,
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77 | WC_WORDS = 1,
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78 | WC_CHARS = 2,
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79 | WC_LENGTH = 3
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80 | };
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81 |
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82 | /* Note: If this changes, remember to change the initialization of
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83 | * 'name' in wc_main. It needs to point to the terminating nul. */
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84 | static const char wc_opts[] = "lwcL"; /* READ THE WARNING ABOVE! */
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85 |
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86 | enum {
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87 | OP_INC_LINE = 1, /* OP_INC_LINE must be 1. */
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88 | OP_SPACE = 2,
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89 | OP_NEWLINE = 4,
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90 | OP_TAB = 8,
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91 | OP_NUL = 16,
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92 | };
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93 |
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94 | /* Note: If fmt_str changes, the offsets to 's' in the OUTPUT section
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95 | * will need to be updated. */
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96 | static const char fmt_str[] = " %7u\0 %s\n";
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97 | static const char total_str[] = "total";
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98 |
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99 | int wc_main(int argc, char **argv)
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100 | {
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101 | FILE *fp;
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102 | const char *s;
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103 | unsigned int *pcounts;
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104 | unsigned int counts[4];
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105 | unsigned int totals[4];
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106 | unsigned int linepos;
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107 | unsigned int u;
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108 | int num_files = 0;
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109 | int c;
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110 | char status = EXIT_SUCCESS;
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111 | char in_word;
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112 | char print_type;
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113 |
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114 | print_type = bb_getopt_ulflags(argc, argv, wc_opts);
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115 |
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116 | if (print_type == 0) {
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117 | print_type = (1 << WC_LINES) | (1 << WC_WORDS) | (1 << WC_CHARS);
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118 | }
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119 |
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120 | argv += optind;
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121 | if (!*argv) {
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122 | *--argv = (char *) bb_msg_standard_input;
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123 | }
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124 |
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125 | memset(totals, 0, sizeof(totals));
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126 |
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127 | pcounts = counts;
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128 |
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129 | do {
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130 | ++num_files;
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131 | if (!(fp = bb_wfopen_input(*argv))) {
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132 | status = EXIT_FAILURE;
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133 | continue;
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134 | }
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135 |
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136 | memset(counts, 0, sizeof(counts));
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137 | linepos = 0;
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138 | in_word = 0;
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139 |
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140 | do {
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141 | ++counts[WC_CHARS];
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142 | c = getc(fp);
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143 | if (isprint(c)) {
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144 | ++linepos;
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145 | if (!isspace_given_isprint(c)) {
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146 | in_word = 1;
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147 | continue;
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148 | }
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149 | } else if (((unsigned int)(c - 9)) <= 4) {
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150 | /* \t 9
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151 | * \n 10
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152 | * \v 11
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153 | * \f 12
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154 | * \r 13
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155 | */
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156 | if (c == '\t') {
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157 | linepos = (linepos | 7) + 1;
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158 | } else { /* '\n', '\r', '\f', or '\v' */
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159 | DO_EOF:
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160 | if (linepos > counts[WC_LENGTH]) {
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161 | counts[WC_LENGTH] = linepos;
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162 | }
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163 | if (c == '\n') {
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164 | ++counts[WC_LINES];
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165 | }
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166 | if (c != '\v') {
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167 | linepos = 0;
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168 | }
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169 | }
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170 | } else if (c == EOF) {
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171 | if (ferror(fp)) {
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172 | bb_perror_msg("%s", *argv);
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173 | status = EXIT_FAILURE;
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174 | }
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175 | --counts[WC_CHARS];
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176 | goto DO_EOF; /* Treat an EOF as '\r'. */
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177 | } else {
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178 | continue;
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179 | }
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180 |
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181 | counts[WC_WORDS] += in_word;
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182 | in_word = 0;
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183 | if (c == EOF) {
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184 | break;
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185 | }
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186 | } while (1);
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187 |
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188 | if (totals[WC_LENGTH] < counts[WC_LENGTH]) {
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189 | totals[WC_LENGTH] = counts[WC_LENGTH];
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190 | }
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191 | totals[WC_LENGTH] -= counts[WC_LENGTH];
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192 |
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193 | bb_fclose_nonstdin(fp);
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194 |
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195 | OUTPUT:
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196 | s = fmt_str + 1; /* Skip the leading space on 1st pass. */
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197 | u = 0;
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198 | do {
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199 | if (print_type & (1 << u)) {
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200 | bb_printf(s, pcounts[u]);
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201 | s = fmt_str; /* Ok... restore the leading space. */
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202 | }
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203 | totals[u] += pcounts[u];
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204 | } while (++u < 4);
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205 |
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206 | s += 8; /* Set the format to the empty string. */
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207 |
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208 | if (*argv != bb_msg_standard_input) {
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209 | s -= 3; /* We have a name, so do %s conversion. */
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210 | }
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211 | bb_printf(s, *argv);
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212 |
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213 | } while (*++argv);
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214 |
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215 | /* If more than one file was processed, we want the totals. To save some
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216 | * space, we set the pcounts ptr to the totals array. This has the side
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217 | * effect of trashing the totals array after outputting it, but that's
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218 | * irrelavent since we no longer need it. */
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219 | if (num_files > 1) {
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220 | num_files = 0; /* Make sure we don't get here again. */
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221 | *--argv = (char *) total_str;
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222 | pcounts = totals;
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223 | goto OUTPUT;
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224 | }
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225 |
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226 | bb_fflush_stdout_and_exit(status);
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227 | }
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