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#include "../command.h"
#include <signal.h>
static struct {
bool append;
bool handle_sigint;
} flags;
static void help(void) {
printf("Usage: tee [-ai] [FILE]...\n\n");
printf("Copy stdin to each FILE, and also to stdout\n\n");
printf("\t-a Append to the given FILEs, don't overwrite\n");
printf("\t-i Ignore interrupt signals (SIGINT)\n");
exit(EXIT_SUCCESS);
}
static void handle(int dummy){UNUSED(dummy);}
static void run_tee(int file_count, FILE* files[file_count]) {
char c;
while((c = getchar()) != EOF) {
for (int i = 0; i < file_count; i++) {
fwrite(&c, 1, 1, files[i]);
fflush(files[i]);
}
putchar(c);
}
for (int i = 0; i < file_count; i++) {
fclose(files[i]);
}
}
static int short_arg(char c, char* next) {
UNUSED(next);
switch (c) {
case 'a':
flags.append = true;
break;
case 'i':
flags.handle_sigint = true;
break;
default:
error("error: unkown option: %c", c);
}
return ARG_UNUSED;
}
COMMAND(tee) {
flags.append = false;
flags.handle_sigint = false;
int start = parse_args(argc, argv, help, short_arg, NULL);
if (flags.handle_sigint) {
signal(SIGINT, handle);
}
if (argc - start < 1) {
run_tee(0, NULL);
return EXIT_SUCCESS;
}
FILE* files[argc - start];
for (int i = start; i < argc; i++) {
FILE* file = get_file(argv[i], flags.append ? "a" : "w");
files[i - start] = file;
}
run_tee(argc - start, files);
return EXIT_SUCCESS;
}
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