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

#include "dbg.h"
#include "util.h"

#ifdef POSIX
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
#endif

// print message to stderr and then exit
void die(const char* s) {
	fprintf(stderr, "ERROR: %s.\n", s);
	exit(1);
}

// print perror message to stderr and then exit
void diePerror(const char* s) {
	perror(s);
	exit(1);
}

// read the file at the given path and return a byte buffer
// pointing to the contents of the file, the length of which
// is stored in rsize
uint8_t* readFile(char* path, size_t* rsize) {
	size_t   size = 0;
	uint8_t* buf  = 0;
#ifdef POSIX
	int      fd   = 0;

	fd = open(path, O_RDONLY);
	SGUARD(fd);

	size = lseek(fd, 0, SEEK_END);
	SGUARD(size);

	buf = mmap(0, size, PROT_READ, MAP_PRIVATE, fd, 0);
	SGUARD(buf);

	SGUARD(close(fd));
#else
	FILE*    fp   = 0;

	fp = fopen(path, "rb");
	GUARD(fp);

	GUARD(fseek(fp, 0, SEEK_END));

	size = ftell(fp);

	rewind(fp);

	buf = malloc(size);
	GUARD(buf);

	GUARD(fread(buf, 1, size, fp) == size);

	GUARD(fclose(fp));
#endif

	*rsize = size;

	return buf;
}

// free read file
void freeFile(uint8_t* buf, size_t size) {
#ifdef POSIX
	SGUARD(munmap(buf, size));
#else
	free(buf);
#endif
}