#include "blather.h"

// If condition is a truthy value, call perror() with a message
// constructed with the fmt and additional args provided then exit.
// Example:
//
// checkfail(myfd==-1, "Couldn't open file %s", filename);
void check_fail(int condition, int perr, char *fmt, ...) {
    if (!condition) {
        return;
    }
    if (perr) {
        char msg[MAXLINE]; // buffer for message
        va_list myargs;    // declare a va_list type variable
        va_start(myargs,
                 fmt); // initialise the va_list variable with the ... after fmt
        vsnprintf(msg, MAXLINE, fmt,
                  myargs); // forward the '...' to vsnprintf()
        va_end(myargs);    // clean up the va_list
        perror(msg);
    } else {
        va_list myargs; // declare a va_list type variable
        va_start(myargs,
                 fmt); // initialise the va_list variable with the ... after fmt
        vfprintf(stderr, fmt, myargs); // forward the '...' to vfprintf()
        va_end(myargs);                // clean up the va_list
    }
    exit(1);
}

// Print like printf but only if DEBUG is defined as 1. Print to
// standard error.
void dbg_printf(char *fmt, ...) {
    if (DEBUG) {
        va_list myargs; // declare a va_list type variable
        va_start(myargs,
                 fmt); // initialise the va_list variable with the ... after fmt
        vfprintf(stderr, fmt, myargs); // forward the '...' to vfprintf()
        va_end(myargs);                // clean up the va_list
    }
}

// Sleep the running program for the given number of nanoseconds and
// seconds.
void pause_for(long nanos, int secs) {
    struct timespec tm = {
        .tv_nsec = nanos, .tv_sec = secs,
    };
    nanosleep(&tm, NULL);
}