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#define _XOPEN_SOURCE 700
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
enum {
FLAG_c = 1 << 0,
FLAG_l = 1 << 1,
FLAG_w = 1 << 2,
};
struct count {
long w, c, l;
};
/* function to handle which counts to print, given the flags.
* give the fname as NULL in order not to print a name.
*/
void
print_count(struct count *ct, char *fname, int flags) {
if (flags == (FLAG_c | FLAG_l | FLAG_w)) {
/* default */
printf("%8ld%8ld%8ld", ct->l, ct->w, ct->c);
} else {
char *format_str = " %8d";
char *fstr = "%d";
if (flags & FLAG_l) {
printf(fstr, ct->l);
fstr = format_str;
}
if (flags & FLAG_w) {
printf(fstr, ct->w);
fstr = format_str;
}
if (flags & FLAG_c) {
printf(fstr, ct->c);
fstr = format_str;
}
}
if (fname)
printf(" %s", fname);
printf("\n");
}
int
wc(struct count *ct, FILE *f) {
int c, in_word = 0;
while ((c = fgetc(f)) != EOF) {
if (c == '\n')
++ct->l;
if (isspace(c))
in_word = 0;
else if (in_word == 0) {
in_word = 1;
++ct->w;
}
++ct->c;
}
if (ferror(f)) {
fprintf(stderr, "wc: %s\n", strerror(errno));
return 1;
}
return 0;
}
int
main(int argc, char **argv) {
int c, flags, ret_val;
flags = 0;
ret_val = 0;
struct count global = { 0 };
while ((c = getopt(argc, argv, "clw")) != -1) {
switch (c) {
case 'c':
flags |= FLAG_c;
break;
case 'l':
flags |= FLAG_l;
break;
case 'w':
flags |= FLAG_w;
break;
default:
flags = FLAG_c | FLAG_l | FLAG_w;
break;
}
}
/* if no options given */
if (optind == 1)
flags = FLAG_c | FLAG_l | FLAG_w;
argv += optind - 1;
if (optind == argc) {
if (wc(&global, stdin) != 0)
ret_val = 1;
} else while (*++argv) {
struct count ct = { 0 };
FILE *f;
if (**argv == '-')
f = stdin;
else {
f = fopen(*argv, "r");
if (f == NULL) {
fprintf(stderr, "wc: %s: %s\n", *argv, strerror(errno));
ret_val = 1;
continue;
}
}
if (wc(&ct, f) != 0) {
ret_val = 1;
continue;
}
if (fileno(f) != 0 && fclose(f) == EOF) {
fprintf(stderr, "wc: %s: %s\n", *argv, strerror(errno));
ret_val = 1;
}
print_count(&ct, *argv, flags);
global.l += ct.l;
global.w += ct.w;
global.c += ct.c;
}
if (optind + 1 == argc)
return ret_val;
/* print globals */
if (optind == argc)
print_count(&global, NULL, flags);
else
print_count(&global, "total", flags);
return ret_val;
}
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