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const true = 1;
const false = 0;
// This should really be a constant, but we only allow integers...
let null: void*; // Zero initialized by default.
///////////////////////////////////////////////////////////////////////////////
// Syscalls
fn write(fd: int, s: void*, n: int): int {
return syscall3(SYS_write, fd, s, n);
}
fn exit(status: int): int {
return syscall1(SYS_exit, status);
}
fn read(fd: int, s: void*, n: int): int {
return syscall3(SYS_read, fd, s, n);
}
fn open(path: char*, flags: int, mode: int): int {
return syscall3(SYS_open, path, flags, mode);
}
fn close(fd: int): int {
return syscall1(SYS_close, fd);
}
fn openat(fd: int, path: char*, flags: int, mode: int): int {
return syscall4(SYS_openat, fd, path, flags, mode);
}
fn fork(): int {
return syscall0(SYS_fork);
}
fn wait(status: int*): int {
return syscall4(SYS_wait4, -1, status, 0, 0);
}
fn lseek(fd: int, offset: int, whence: int): int {
return syscall3(SYS_lseek, fd, offset, whence);
}
fn mmap(addr: void*, len: int, prot: int, flags: int, fd: int, offset: int): void* {
return syscall6(SYS_mmap, addr, len, prot, flags, fd, offset);
}
///////////////////////////////////////////////////////////////////////////////
// Strings
fn strlen(s: char *): int {
let count: int = 0;
while (*s != 0) {
count = count + 1;
s = s + 1;
}
return count;
}
fn strcpy(dst: char *, src: char *) {
while (*src != 0) {
*dst = *src;
dst = dst + 1;
src = src + 1;
}
*dst = '\0';
}
fn strcat(dst: char *, src: char *) {
while (*dst != 0) {
dst = dst + 1;
}
while (*src != 0) {
*dst = *src;
dst = dst + 1;
src = src + 1;
}
*dst = '\0';
}
fn streq(s1: char *, s2: char *): int {
while (*s1 != 0 && *s2 != 0) {
if (*s1 != *s2)
return 0;
s1 = s1 + 1;
s2 = s2 + 1;
}
return *s1 == *s2;
}
fn strrev(s: char *) {
let len: int = strlen(s);
let i: int = 0;
let j: int = len - 1;
while (i < j) {
let tmp: char = s[i];
s[i] = s[j];
s[j] = tmp;
i = i + 1;
j = j - 1;
}
}
fn atoi_end(s: char *, end: char**): int {
let i: int = 0;
let sign: int = 1;
if (*s == '-') {
sign = -1;
s = s + 1;
}
while (*s >= '0' && *s <= '9') {
i = i * 10 + (*s - '0');
s = s + 1;
}
*end = s;
return i * sign;
}
fn atoi(s: char *): int {
let tmp: char*;
return atoi_end(s, &tmp);
}
///////////////////////////////////////////////////////////////////////////////
// I/O
const stdin = 0;
const stdout = 1;
const stderr = 2;
fn putc(c: char) {
write(0, &c, 1);
}
fn puts(c: char *) {
let len: int = strlen(c);
write(1, c, len);
}
fn putsln(c: char *) {
puts(c);
putc('\n');
}
fn putu_buffer(n: int, buf: char*): int {
let i: int = 0;
while (n > 0) {
buf[i] = (n % 10) + '0';
n = n / 10;
i = i + 1;
}
if (i == 0) {
buf[i] = '0';
i = i + 1;
}
buf[i] = 0;
if (i > 1)
strrev(buf);
return i;
}
fn putu(n: int) {
let buf: char[32];
let len = putu_buffer(n, buf);
write(stdout, buf, len);
}
fn die(msg: char *) {
putsln(msg);
exit(1);
}
fn die2(msg1: char *, msg2: char *) {
puts(msg1);
putsln(msg2);
exit(1);
}
// TODO: file/line numbers would be helpful
fn assert(cond: int) {
if (!cond)
die("assertion failed");
}
///////////////////////////////////////////////////////////////////////////////
// Math
fn min(a: int, b: int): int {
return a < b ? a : b;
}
fn max(a: int, b: int): int {
return a > b ? a : b;
}
fn sign(a: int): int {
return a > 0 ? 1 : a == 0 ? 0 : -1;
}
fn abs(a: int): int {
return a * sign(a);
}
fn factorial(n: int): int {
let res: int = 1;
for (;n > 0; n = n - 1)
res = res * n;
return res;
}
fn align_up(val: int, algn: int): int {
return (val + algn - 1) & ~(algn - 1);
}
///////////////////////////////////////////////////////////////////////////////
// Memory
// FIXME: This is horrible for performance.
fn memcpy(dst: void *, src: void *, n: int) {
let _dst: char* = dst;
let _src: char* = src;
for (let i: int = 0; i < n; i = i + 1)
_dst[i] = _src[i];
}
const __MALLOC_BUF_SIZE = 1024 * 1024 * 1024; // 1 GB
let __malloc_buf: char[__MALLOC_BUF_SIZE];
let __malloc_buf_pos = 0;
fn malloc(size: int): void* {
if (__malloc_buf_pos + size > __MALLOC_BUF_SIZE)
die("malloc: out of memory. only 1gb available");
let ptr = &__malloc_buf[__malloc_buf_pos];
__malloc_buf_pos = __malloc_buf_pos + size;
return ptr;
}
fn free(ptr: void*) {} // Placeholder
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