1 /* wc.c - Word count
2 *
3 * Copyright 2011 Rob Landley <rob@landley.net>
4 *
5 * See http://opengroup.org/onlinepubs/9699919799/utilities/wc.html
6
7 USE_WC(NEWTOY(wc, "mcwl", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_LOCALE))
8
9 config WC
10 bool "wc"
11 default y
12 help
13 usage: wc -lwcm [FILE...]
14
15 Count lines, words, and characters in input.
16
17 -l show lines
18 -w show words
19 -c show bytes
20 -m show characters
21
22 By default outputs lines, words, bytes, and filename for each
23 argument (or from stdin if none). Displays only either bytes
24 or characters.
25 */
26
27 #define FOR_wc
28 #include "toys.h"
29
GLOBALS(unsigned long totals[4];)30 GLOBALS(
31 unsigned long totals[4];
32 )
33
34 static void show_lengths(unsigned long *lengths, char *name)
35 {
36 int i, space = 7, first = 1;
37
38 for (i = 0; i<4; i++) if (toys.optflags == (1<<i)) space = 0;
39 for (i = 0; i<4; i++) {
40 if (toys.optflags&(1<<i)) {
41 printf(" %*ld"+first, space, lengths[i]);
42 first = 0;
43 }
44 TT.totals[i] += lengths[i];
45 }
46 if (*toys.optargs) printf(" %s", name);
47 xputc('\n');
48 }
49
do_wc(int fd,char * name)50 static void do_wc(int fd, char *name)
51 {
52 int len = 0, clen = 1, space = 0;
53 unsigned long word = 0, lengths[] = {0,0,0,0};
54
55 // Speed up common case: wc -c normalfile is file length.
56 if (toys.optflags == FLAG_c) {
57 struct stat st;
58
59 // On Linux, files in /proc often report their size as 0.
60 if (!fstat(fd, &st) && S_ISREG(st.st_mode) && st.st_size) {
61 lengths[2] = st.st_size;
62 goto show;
63 }
64 }
65
66 for (;;) {
67 int pos, done = 0, len2 = read(fd, toybuf+len, sizeof(toybuf)-len);
68
69 if (len2<0) perror_msg_raw(name);
70 else len += len2;
71 if (len2<1) done++;
72
73 for (pos = 0; pos<len; pos++) {
74 if (toybuf[pos]=='\n') lengths[0]++;
75 lengths[2]++;
76 if (toys.optflags&FLAG_m) {
77 // If we've consumed next wide char
78 if (--clen<1) {
79 wchar_t wchar;
80
81 // next wide size, don't count invalid, fetch more data if necessary
82 clen = mbrtowc(&wchar, toybuf+pos, len-pos, 0);
83 if (clen == -1) continue;
84 if (clen == -2 && !done) break;
85
86 lengths[3]++;
87 space = iswspace(wchar);
88 }
89 } else space = isspace(toybuf[pos]);
90
91 if (space) word=0;
92 else {
93 if (!word) lengths[1]++;
94 word=1;
95 }
96 }
97 if (done) break;
98 if (pos != len) memmove(toybuf, toybuf+pos, len-pos);
99 len -= pos;
100 }
101
102 show:
103 show_lengths(lengths, name);
104 }
105
wc_main(void)106 void wc_main(void)
107 {
108 if (!toys.optflags) toys.optflags = FLAG_l|FLAG_w|FLAG_c;
109 loopfiles(toys.optargs, do_wc);
110 if (toys.optc>1) show_lengths(TT.totals, "total");
111 }
112