xv6/wc.c

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C
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2023-01-04 17:04:31 +01:00
#include "types.h"
#include "stat.h"
#include "user.h"
char buf[512];
void wc(int fd, char *name) {
int i, n;
int l, w, c, inword;
l = w = c = 0;
inword = 0;
while ((n = read(fd, buf, sizeof(buf))) > 0) {
for (i = 0; i < n; i++) {
c++;
if (buf[i] == '\n') {
l++;
}
if (strchr(" \r\t\n\v", buf[i])) {
inword = 0;
}
else if (!inword) {
w++;
inword = 1;
}
}
}
if (n < 0) {
printf(1, "wc: read error\n");
exit();
}
printf(1, "%d %d %d %s\n", l, w, c, name);
}
int main(int argc, char *argv[]) {
int fd, i;
if (argc <= 1) {
wc(0, "");
exit();
}
for (i = 1; i < argc; i++) {
if ((fd = open(argv[i], 0)) < 0) {
printf(1, "wc: cannot open %s\n", argv[i]);
exit();
}
wc(fd, argv[i]);
close(fd);
}
exit();
}