micro-utils/coreutils/cat.c
2023-11-04 17:55:02 +03:00

38 lines
659 B
C

#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
void cat(const int fd) {
char buf[8096];
ssize_t len;
while ((len = read(fd, buf, sizeof(buf))) > 0)
if (write(1, buf, len) != len)
fprintf(stderr, "cat: write error copying\n");
}
int main(const int argc, const char **argv) {
if (argc == 1 || argv[1][0] == '-')
cat(STDIN_FILENO);
else {
for (int i = 1; i < argc; i++) {
if (argv[i][0] == '-')
break;
int fd = open(argv[i], O_RDONLY);
if (fd < 0) {
fprintf(stderr, "cat: %s %s\n", argv[i], strerror(errno));
return 1;
}
cat(fd);
close(fd);
}
}
return 0;
}