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fix various bugs related to guess number example

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This commit is contained in:
Andrew Kelley
2016-01-02 21:56:33 -07:00
parent fb1e3a5be9
commit 1abb4e59be
5 changed files with 25 additions and 17 deletions
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34
std/std.zig
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@@ -1,9 +1,6 @@
const SYS_write : usize = 1;
const SYS_exit : usize = 60;
const SYS_getrandom : usize = 278;
const stdout_fileno : isize = 1;
const stderr_fileno : isize = 2;
const SYS_getrandom : usize = 318;
fn syscall1(number: usize, arg1: usize) -> usize {
asm volatile ("syscall"
@@ -19,32 +16,37 @@ fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) -> usize {
: "rcx", "r11")
}
pub fn getrandom(buf: &u8, count: usize, flags: u32) -> i32 {
return syscall3(SYS_getrandom, buf as usize, count, flags as usize) as i32;
}
pub fn write(fd: isize, buf: &const u8, count: usize) -> isize {
return syscall3(SYS_write, fd as usize, buf as usize, count) as isize;
syscall3(SYS_write, fd as usize, buf as usize, count) as isize
}
pub fn exit(status: i32) -> unreachable {
syscall1(SYS_exit, status as usize);
unreachable;
unreachable
}
pub fn getrandom(buf: &u8, count: usize, flags: u32) -> isize {
syscall3(SYS_getrandom, buf as usize, count, flags as usize) as isize
}
const stdout_fileno : isize = 1;
const stderr_fileno : isize = 2;
// TODO error handling
pub fn os_get_random_bytes(buf: &u8, count: usize) -> i32 {
return getrandom(buf, count, 0);
pub fn os_get_random_bytes(buf: &u8, count: usize) -> isize {
getrandom(buf, count, 0)
}
// TODO error handling
// TODO handle buffering and flushing (mutex protected)
pub fn print_str(str: string) -> isize { fprint_str(stdout_fileno, str) }
pub fn print_str(str: string) -> isize {
fprint_str(stdout_fileno, str)
}
// TODO error handling
// TODO handle buffering and flushing (mutex protected)
pub fn fprint_str(fd: isize, str: string) -> isize {
return write(fd, str.ptr, str.len);
write(fd, str.ptr, str.len)
}
// TODO handle buffering and flushing (mutex protected)
@@ -56,7 +58,9 @@ pub fn print_u64(x: u64) -> isize {
return write(stdout_fileno, buf.ptr, len);
}
fn digit_to_char(digit: u64) -> u8 { '0' + (digit as u8) }
fn digit_to_char(digit: u64) -> u8 {
'0' + (digit as u8)
}
const max_u64_base10_digits: usize = 20;