1 #include <string.h>
2 #include <stdio.h>
3 #include <err.h>
4 
5 static void cat (FILE* file) {
6 	int ch;
7 	while ((ch = fgetc(file)) != EOF)
8 		putchar(ch);
9 }
10 
11 int main (int argc, char* argv[]) {
12 	FILE *file;
13 	int ec = 0;
14 	int ch;
15 
16 	if (argc == 1) {
17 		cat (stdin);
18 		return 0;
19 	}
20 
21 	for (int i = 1; i < argc; ++i) {
22 		if (strcmp (argv[i], "-") == 0) {
23 			file = stdin;
24 		} else {
25 			file = fopen (argv[i], "r");
26 		}
27 
28 		if (file == NULL) {
29 			warn ("%s", argv[i]);
30 			ec = 1;
31 			continue;
32 		}
33 
34 		cat (file);
35 
36 		if (file != stdin)
37 			fclose (file);
38 	}
39 	return ec;
40 }
41