[821] | 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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[1765] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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[821] | 8 | */
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| 9 |
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| 10 | /* BB_AUDIT SUSv3 _NOT_ compliant -- option -m is not currently supported. */
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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 | * TODO:
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| 23 | *
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| 24 | * When locale support is enabled, count multibyte chars in the '-m' case.
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| 25 | *
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| 26 | * NOTES:
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| 27 | *
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| 28 | * The previous busybox wc attempted an optimization using stat for the
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| 29 | * case of counting chars only. I omitted that because it was broken.
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| 30 | * It didn't take into account the possibility of input coming from a
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| 31 | * pipe, or input from a file with file pointer not at the beginning.
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| 32 | *
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| 33 | * To implement such a speed optimization correctly, not only do you
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| 34 | * need the size, but also the file position. Note also that the
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| 35 | * file position may be past the end of file. Consider the example
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| 36 | * (adapted from example in gnu wc.c)
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| 37 | *
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| 38 | * echo hello > /tmp/testfile &&
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[1765] | 39 | * (dd ibs=1k skip=1 count=0 &> /dev/null; wc -c) < /tmp/testfile
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[821] | 40 | *
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| 41 | * for which 'wc -c' should output '0'.
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| 42 | */
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| 43 |
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[1765] | 44 | #include "libbb.h"
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[821] | 45 |
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[1765] | 46 | #if ENABLE_LOCALE_SUPPORT
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[821] | 47 | #define isspace_given_isprint(c) isspace(c)
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| 48 | #else
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| 49 | #undef isspace
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| 50 | #undef isprint
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| 51 | #define isspace(c) ((((c) == ' ') || (((unsigned int)((c) - 9)) <= (13 - 9))))
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| 52 | #define isprint(c) (((unsigned int)((c) - 0x20)) <= (0x7e - 0x20))
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| 53 | #define isspace_given_isprint(c) ((c) == ' ')
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| 54 | #endif
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| 55 |
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[1765] | 56 | #if ENABLE_FEATURE_WC_LARGE
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| 57 | #define COUNT_T unsigned long long
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| 58 | #define COUNT_FMT "llu"
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| 59 | #else
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| 60 | #define COUNT_T unsigned
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| 61 | #define COUNT_FMT "u"
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| 62 | #endif
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| 63 |
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[821] | 64 | enum {
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| 65 | WC_LINES = 0,
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| 66 | WC_WORDS = 1,
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| 67 | WC_CHARS = 2,
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| 68 | WC_LENGTH = 3
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| 69 | };
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| 70 |
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[1765] | 71 | int wc_main(int argc, char **argv);
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[821] | 72 | int wc_main(int argc, char **argv)
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| 73 | {
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| 74 | FILE *fp;
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[1765] | 75 | const char *s, *arg;
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| 76 | const char *start_fmt = "%9"COUNT_FMT;
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| 77 | const char *fname_fmt = " %s\n";
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| 78 | COUNT_T *pcounts;
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| 79 | COUNT_T counts[4];
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| 80 | COUNT_T totals[4];
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| 81 | unsigned linepos;
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| 82 | unsigned u;
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[821] | 83 | int num_files = 0;
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| 84 | int c;
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[1765] | 85 | smallint status = EXIT_SUCCESS;
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| 86 | smallint in_word;
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| 87 | unsigned print_type;
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[821] | 88 |
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[1765] | 89 | print_type = getopt32(argv, "lwcL");
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[821] | 90 |
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| 91 | if (print_type == 0) {
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| 92 | print_type = (1 << WC_LINES) | (1 << WC_WORDS) | (1 << WC_CHARS);
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| 93 | }
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| 94 |
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| 95 | argv += optind;
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[1765] | 96 | if (!argv[0]) {
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[821] | 97 | *--argv = (char *) bb_msg_standard_input;
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[1765] | 98 | fname_fmt = "\n";
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| 99 | if (!((print_type-1) & print_type)) /* exactly one option? */
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| 100 | start_fmt = "%"COUNT_FMT;
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[821] | 101 | }
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| 102 |
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| 103 | memset(totals, 0, sizeof(totals));
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| 104 |
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| 105 | pcounts = counts;
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| 106 |
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[1765] | 107 | while ((arg = *argv++) != 0) {
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[821] | 108 | ++num_files;
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[1765] | 109 | fp = fopen_or_warn_stdin(arg);
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| 110 | if (!fp) {
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[821] | 111 | status = EXIT_FAILURE;
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| 112 | continue;
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| 113 | }
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| 114 |
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| 115 | memset(counts, 0, sizeof(counts));
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| 116 | linepos = 0;
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| 117 | in_word = 0;
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| 118 |
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| 119 | do {
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[1765] | 120 | /* Our -w doesn't match GNU wc exactly... oh well */
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| 121 |
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[821] | 122 | ++counts[WC_CHARS];
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| 123 | c = getc(fp);
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| 124 | if (isprint(c)) {
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| 125 | ++linepos;
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| 126 | if (!isspace_given_isprint(c)) {
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| 127 | in_word = 1;
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| 128 | continue;
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| 129 | }
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| 130 | } else if (((unsigned int)(c - 9)) <= 4) {
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| 131 | /* \t 9
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| 132 | * \n 10
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| 133 | * \v 11
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| 134 | * \f 12
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| 135 | * \r 13
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| 136 | */
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| 137 | if (c == '\t') {
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| 138 | linepos = (linepos | 7) + 1;
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| 139 | } else { /* '\n', '\r', '\f', or '\v' */
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| 140 | DO_EOF:
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| 141 | if (linepos > counts[WC_LENGTH]) {
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| 142 | counts[WC_LENGTH] = linepos;
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| 143 | }
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| 144 | if (c == '\n') {
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| 145 | ++counts[WC_LINES];
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| 146 | }
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| 147 | if (c != '\v') {
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| 148 | linepos = 0;
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| 149 | }
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| 150 | }
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| 151 | } else if (c == EOF) {
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| 152 | if (ferror(fp)) {
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[1765] | 153 | bb_perror_msg("%s", arg);
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[821] | 154 | status = EXIT_FAILURE;
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| 155 | }
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| 156 | --counts[WC_CHARS];
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| 157 | goto DO_EOF; /* Treat an EOF as '\r'. */
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| 158 | } else {
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| 159 | continue;
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| 160 | }
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| 161 |
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| 162 | counts[WC_WORDS] += in_word;
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| 163 | in_word = 0;
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| 164 | if (c == EOF) {
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| 165 | break;
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| 166 | }
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| 167 | } while (1);
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| 168 |
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| 169 | if (totals[WC_LENGTH] < counts[WC_LENGTH]) {
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| 170 | totals[WC_LENGTH] = counts[WC_LENGTH];
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| 171 | }
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| 172 | totals[WC_LENGTH] -= counts[WC_LENGTH];
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| 173 |
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[1765] | 174 | fclose_if_not_stdin(fp);
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[821] | 175 |
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| 176 | OUTPUT:
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[1765] | 177 | /* coreutils wc tries hard to print pretty columns
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| 178 | * (saves results for all files, find max col len etc...)
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| 179 | * we won't try that hard, it will bloat us too much */
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| 180 | s = start_fmt;
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[821] | 181 | u = 0;
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| 182 | do {
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| 183 | if (print_type & (1 << u)) {
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[1765] | 184 | printf(s, pcounts[u]);
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| 185 | s = " %9"COUNT_FMT; /* Ok... restore the leading space. */
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[821] | 186 | }
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| 187 | totals[u] += pcounts[u];
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| 188 | } while (++u < 4);
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[1765] | 189 | printf(fname_fmt, arg);
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| 190 | }
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[821] | 191 |
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| 192 | /* If more than one file was processed, we want the totals. To save some
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| 193 | * space, we set the pcounts ptr to the totals array. This has the side
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| 194 | * effect of trashing the totals array after outputting it, but that's
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| 195 | * irrelavent since we no longer need it. */
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| 196 | if (num_files > 1) {
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| 197 | num_files = 0; /* Make sure we don't get here again. */
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[1765] | 198 | arg = "total";
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[821] | 199 | pcounts = totals;
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[1765] | 200 | --argv;
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[821] | 201 | goto OUTPUT;
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| 202 | }
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| 203 |
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[1765] | 204 | fflush_stdout_and_exit(status);
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[821] | 205 | }
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