#include "sigcat.h"

void setup_default_handlers(void) {
    struct sigaction sa;
    memset(&sa, 0, sizeof(sa));
    sa.sa_handler = default_signal_handler;
    sa.sa_flags = SA_RESTART;

    for (int i = SIGMIN; i <= SIGMAX; i++) {
        // Cannot process SIGKILL or SIGSTOP
        if (i == SIGKILL || i == SIGSTOP) {
            continue;
        }

        sigaction(i, &sa, 0);
    }
}

void default_signal_handler(int s) {
    fprintf(outputStream, "sigcat received %s\n", strsignal(s));
    fflush(outputStream);

    if (s == SIGUSR1 || s == SIGUSR2) {
        usr_signal_handler(s);
    }
}

void usr_signal_handler(int s) {
    if (s == SIGUSR1) {
        outputStream = stdout;
    } else if (s == SIGUSR2) {
        outputStream = stderr;
    }
}

int main(int argc, char *argv[]) {
    // Defined in header
    outputStream = stdout;

    setup_default_handlers();

    // Forever loop input until recieve EOF
    char *line;
    while ((line = read_line(stdin)) != NULL) {
        strcat(line, "\n");
        fprintf(outputStream, line);
        fflush(outputStream);
        free(line);
    }

    return 0;
}