#include <stdlib.h>
#include <string.h>
#include <stdio.h>

#include "util.h"

#if DEBUG
void _log(int line, const char* file, const char* format, ...) {
    fprintf(stderr, "%s:%d: info: ", file, line);
#else
void _log(const char* format, ...) {
#endif
    va_list args;
    va_start(args, format);
    vfprintf(stderr, format, args);
    va_end(args);
}

#if DEBUG
void _die(int line, const char* file, const char* format, ...) {
    fprintf(stderr, "%s:%d: error: ", file, line);
#else
void _die(const char* format, ...) {
#endif
    va_list args;
    va_start(args, format);
    vfprintf(stderr, format, args);
    va_end(args);
    exit(1);
}


void* emalloc(size_t size, char* alloc_reason) {
	void* d = malloc(size);
	if (d == NULL) die("Failed to allocate %s", alloc_reason);
	return d;
}

char* vastrcat_(int dummy, ...) {

    va_list args;
    va_list args2;
    va_start(args, dummy);
	va_copy(args2, args);

	// get len of output string
	size_t len = 0;
    char* arg = NULL;
    while ((arg = va_arg(args, char*))) {
		len += strlen(arg);
    }
    va_end(args);

	// allocate and build output
	char* output = malloc(len + 1);
    if (!output) return NULL;
	char* p = output;
    while ((arg = va_arg(args, char*))) {
		size_t alen = strlen(arg);
		memcpy(p, arg, alen);
		p += alen;
    }
	output[len] = '\0';
    va_end(args2);

	return output;
}