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#include <sys/mman.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
void *sys_alloc(u64 length)
{
assert(length);
void *result = mmap(0, length, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
return result;
}
void sys_free(void *memory, u64 length)
{
assert(memory);
assert(length);
munmap(memory, length);
}
void die(const char *error_string, ...)
{
va_list args;
va_start(args, error_string);
fprintf(stderr, "error: ");
vfprintf(stderr, error_string, args);
fprintf(stderr, "\n");
va_end(args);
_exit(1);
}
u64 sys_read_file(arena_t *arena, char **buffer, const char *filename)
{
FILE *file = fopen(filename, "rb");
if (!file)
return 0;
if (fseek(file, 0, SEEK_END) == -1)
goto error;
long len = ftell(file);
if (!len || (len == -1))
goto error;
if (fseek(file, 0, SEEK_SET) == -1)
goto error;
*buffer = push_arena(arena, len + 1);
if (!fread(*buffer, 1, len, file)) {
pop_arena(arena, len + 1);
*buffer = 0;
goto error;
}
(*buffer)[len] = 0;
fclose(file);
return len;
error:
fclose(file);
*buffer = 0;
return 0;
}
char *sys_getbindir(arena_t *arena)
{
char path[MAX_PATH];
i64 len = readlink("/proc/self/exe", path, MAX_PATH - 1);
if (len <= 0)
return 0;
path[len] = 0;
char *dir = strrchr(path, '/');
assert(dir);
assert(dir > path);
len = dir - path;
dir = push_arena(arena, len + 1);
prb_memmove(dir, path, len);
dir[len] = 0;
return dir;
}
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