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#include "sys.h"
#include "macros.h"
#include "prbs.h"
#include <sys/mman.h>
#include <stdarg.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
void
*sys_alloc(u64 length)
{
assert(length);
i32 prot = PROT_READ | PROT_WRITE;
i32 flags = MAP_PRIVATE|MAP_ANONYMOUS;
void *result = mmap(0, length, prot, flags, -1, 0);
return result;
}
void
sys_free(void *memory, u64 length)
{
assert(memory);
assert(length);
munmap(memory, length);
}
void
die(const char *format, ...)
{
va_list args;
va_start(args, format);
fprintf(stderr, "error: ");
vfprintf(stderr, format, args);
fprintf(stderr, "\n");
va_end(args);
_exit(1);
}
void
info(const char *format, ...)
{
va_list args;
va_start(args, format);
vprintf(format, args);
putchar('\n');
va_end(args);
}
char *
read_entire_file(struct arena *arena, u64 *len, const char *filename)
{
FILE *file = fopen(filename, "rb");
if (!file)
return 0;
if (fseek(file, 0, SEEK_END) == -1)
goto error;
i64 n = ftell(file);
if (n <= 0)
goto error;
if (len)
*len = n;
if (fseek(file, 0, SEEK_SET) == -1)
goto error;
char *buffer = push_arena(arena, n + 1);
if (!fread(buffer, 1, n, file)) {
pop_arena(arena, n + 1);
goto error;
}
fclose(file);
buffer[n] = 0;
return buffer;
error:
fclose(file);
return 0;
}
struct string
get_basedir(struct arena *arena)
{
char buf[1024] = {0};
if (readlink("/proc/self/exe", buf, 1024 - 1) == -1)
die("failed to read link /proc/self/exe");
struct arena temp = alloc_arena(0);
struct string full = string_from_cstring(&temp, buf);
struct string base = push_string(arena, get_dirname(full));
release_arena(&temp);
return base;
}
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