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#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
void
error(const char* msg) {
fprintf(stderr, ":( error: %s\n", msg);
exit(EXIT_FAILURE);
}
const char*
read_file(const char* path) {
struct stat stat_info;
if (stat(path, &stat_info) == -1)
error("i couldn't open that file, sorry :(");
const int file = open(path, O_RDONLY);
if (file == -1)
error("i couldn't open that file, sorry :(");
const int mmap_prot = PROT_READ;
const int mmap_flags = MAP_PRIVATE;
const void* file_data = mmap(
NULL, stat_info.st_size, mmap_prot, mmap_flags, file, 0
);
return (const char*)file_data;
}
int
main(const int argc, const char* argv[]) {
if (argc != 2) {
printf("usage: catboot <filename>\n");
return EXIT_FAILURE;
}
const char* file_path = argv[1];
const char* source = read_file(file_path);
printf("%s", source);
return EXIT_SUCCESS;
}
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