1 /* vi: set sw=4 ts=4: */
3 * wc implementation for busybox
5 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 /* BB_AUDIT SUSv3 compliant. */
11 /* http://www.opengroup.org/onlinepubs/007904975/utilities/wc.html */
13 /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
15 * Rewritten to fix a number of problems and do some size optimizations.
16 * Problems in the previous busybox implementation (besides bloat) included:
17 * 1) broken 'wc -c' optimization (read note below)
18 * 2) broken handling of '-' args
19 * 3) no checking of ferror on EOF returns
20 * 4) isprint() wasn't considered when word counting.
24 * The previous busybox wc attempted an optimization using stat for the
25 * case of counting chars only. I omitted that because it was broken.
26 * It didn't take into account the possibility of input coming from a
27 * pipe, or input from a file with file pointer not at the beginning.
29 * To implement such a speed optimization correctly, not only do you
30 * need the size, but also the file position. Note also that the
31 * file position may be past the end of file. Consider the example
32 * (adapted from example in gnu wc.c)
34 * echo hello > /tmp/testfile &&
35 * (dd ibs=1k skip=1 count=0 &> /dev/null; wc -c) < /tmp/testfile
37 * for which 'wc -c' should output '0'.
42 #if !ENABLE_LOCALE_SUPPORT
45 # define isprint(c) ((unsigned)((c) - 0x20) <= (0x7e - 0x20))
46 # define isspace(c) ((c) == ' ')
49 #if ENABLE_FEATURE_WC_LARGE
50 # define COUNT_T unsigned long long
51 # define COUNT_FMT "llu"
53 # define COUNT_T unsigned
54 # define COUNT_FMT "u"
57 /* We support -m even when UNICODE_SUPPORT is off,
58 * we just don't advertise it in help text,
59 * since it is the same as -c in this case.
62 //usage:#define wc_trivial_usage
63 //usage: "[-c"IF_UNICODE_SUPPORT("m")"lwL] [FILE]..."
65 //usage:#define wc_full_usage "\n\n"
66 //usage: "Count lines, words, and bytes for each FILE (or stdin)\n"
68 //usage: "\n -c Count bytes"
69 //usage: IF_UNICODE_SUPPORT(
70 //usage: "\n -m Count characters"
72 //usage: "\n -l Count newlines"
73 //usage: "\n -w Count words"
74 //usage: "\n -L Print longest line length"
76 //usage:#define wc_example_usage
77 //usage: "$ wc /etc/passwd\n"
78 //usage: " 31 46 1365 /etc/passwd\n"
80 /* Order is important if we want to be compatible with
81 * column order in "wc -cmlwL" output:
92 int wc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
93 int wc_main(int argc UNUSED_PARAM, char **argv)
96 const char *start_fmt = " %9"COUNT_FMT + 1;
97 const char *fname_fmt = " %s\n";
99 COUNT_T counts[NUM_WCS];
100 COUNT_T totals[NUM_WCS];
102 smallint status = EXIT_SUCCESS;
107 print_type = getopt32(argv, "lwcmL");
109 if (print_type == 0) {
110 print_type = (1 << WC_LINES) | (1 << WC_WORDS) | (1 << WC_CHARS);
115 *--argv = (char *) bb_msg_standard_input;
118 if (!argv[1]) { /* zero or one filename? */
119 if (!((print_type-1) & print_type)) /* exactly one option? */
120 start_fmt = "%"COUNT_FMT;
123 memset(totals, 0, sizeof(totals));
128 while ((arg = *argv++) != NULL) {
136 fp = fopen_or_warn_stdin(arg);
138 status = EXIT_FAILURE;
142 memset(counts, 0, sizeof(counts));
148 /* Our -w doesn't match GNU wc exactly... oh well */
153 bb_simple_perror_msg(arg);
154 status = EXIT_FAILURE;
156 goto DO_EOF; /* Treat an EOF as '\r'. */
159 /* Cater for -c and -m */
161 if (unicode_status != UNICODE_ON /* every byte is a new char */
162 || (c & 0xc0) != 0x80 /* it isn't a 2nd+ byte of a Unicode char */
164 ++counts[WC_UNICHARS];
167 if (isprint_asciionly(c)) { /* FIXME: not unicode-aware */
173 } else if ((unsigned)(c - 9) <= 4) {
181 linepos = (linepos | 7) + 1;
182 } else { /* '\n', '\r', '\f', or '\v' */
184 if (linepos > counts[WC_LENGTH]) {
185 counts[WC_LENGTH] = linepos;
198 counts[WC_WORDS] += in_word;
205 fclose_if_not_stdin(fp);
207 if (totals[WC_LENGTH] < counts[WC_LENGTH]) {
208 totals[WC_LENGTH] = counts[WC_LENGTH];
210 totals[WC_LENGTH] -= counts[WC_LENGTH];
213 /* coreutils wc tries hard to print pretty columns
214 * (saves results for all files, finds max col len etc...)
215 * we won't try that hard, it will bloat us too much */
219 if (print_type & (1 << u)) {
220 printf(s, pcounts[u]);
221 s = " %9"COUNT_FMT; /* Ok... restore the leading space. */
223 totals[u] += pcounts[u];
224 } while (++u < NUM_WCS);
225 printf(fname_fmt, arg);
228 /* If more than one file was processed, we want the totals. To save some
229 * space, we set the pcounts ptr to the totals array. This has the side
230 * effect of trashing the totals array after outputting it, but that's
231 * irrelavent since we no longer need it. */
233 num_files = 0; /* Make sure we don't get here again. */
240 fflush_stdout_and_exit(status);