strtol

hello.c

@@ -1,5 +1,4 @@
 #include<stdio.h>
-
 int main(int argc, char *argv[]) {
     int result = printf("Hello, world!\n");
     if (result != 15) {

libuwuc/src/error.rs

@@ -0,0 +1,51 @@
+use core::{cell::UnsafeCell, ptr::addr_of};
+
+#[thread_local]
+static ERRNO: UnsafeCell<i32> = UnsafeCell::new(0);
+
+pub fn errno_location() -> *const i32 {
+    addr_of!(ERRNO).cast()
+}
+
+pub fn errno() -> i32 {
+    unsafe { *ERRNO.get() }
+}
+
+pub fn set_errno(errno: i32) {
+    unsafe { ERRNO.get().write(errno) }
+}
+
+pub const EPERM: i32 = 1; /* Operation not permitted */
+pub const ENOENT: i32 = 2; /* No such file or directory */
+pub const ESRCH: i32 = 3; /* No such process */
+pub const EINTR: i32 = 4; /* Interrupted system call */
+pub const EIO: i32 = 5; /* I/O error */
+pub const ENXIO: i32 = 6; /* No such device or address */
+pub const E2BIG: i32 = 7; /* Argument list too long */
+pub const ENOEXEC: i32 = 8; /* Exec format error */
+pub const EBADF: i32 = 9; /* Bad file number */
+pub const ECHILD: i32 = 10; /* No child processes */
+pub const EAGAIN: i32 = 11; /* Try again */
+pub const ENOMEM: i32 = 12; /* Out of memory */
+pub const EACCES: i32 = 13; /* Permission denied */
+pub const EFAULT: i32 = 14; /* Bad address */
+pub const ENOTBLK: i32 = 15; /* Block device required */
+pub const EBUSY: i32 = 16; /* Device or resource busy */
+pub const EEXIST: i32 = 17; /* File exists */
+pub const EXDEV: i32 = 18; /* Cross-device link */
+pub const ENODEV: i32 = 19; /* No such device */
+pub const ENOTDIR: i32 = 20; /* Not a directory */
+pub const EISDIR: i32 = 21; /* Is a directory */
+pub const EINVAL: i32 = 22; /* Invalid argument */
+pub const ENFILE: i32 = 23; /* File table overflow */
+pub const EMFILE: i32 = 24; /* Too many open files */
+pub const ENOTTY: i32 = 25; /* Not a typewriter */
+pub const ETXTBSY: i32 = 26; /* Text file busy */
+pub const EFBIG: i32 = 27; /* File too large */
+pub const ENOSPC: i32 = 28; /* No space left on device */
+pub const ESPIPE: i32 = 29; /* Illegal seek */
+pub const EROFS: i32 = 30; /* Read-only file system */
+pub const EMLINK: i32 = 31; /* Too many links */
+pub const EPIPE: i32 = 32; /* Broken pipe */
+pub const EDOM: i32 = 33; /* Math argument out of domain of func */
+pub const ERANGE: i32 = 34; /* Math result not representable */

libuwuc/src/fmt/mod.rs

@@ -3,9 +3,9 @@ use core::ffi::c_int;
 pub mod parse;
 pub mod printf;
 
-pub fn is_space(c: c_int) -> c_int {
+pub fn is_space(c: c_int) -> bool {
     // todo: is this correct?
     char::from_u32(c as _)
         .map(char::is_whitespace)
-        .unwrap_or_default() as _
+        .unwrap_or_default()
 }

libuwuc/src/fmt/parse.rs

@@ -1,18 +1,161 @@
 use core::ffi::{c_int, c_long};
 
-use crate::utils::SharedThinCstr;
+use crate::{
+    error::{set_errno, EINVAL},
+    utils::SharedThinCstr,
+};
 
-pub unsafe fn parse_long<'a>(
+pub fn parse_long<'a>(
     str: SharedThinCstr<'a>,
-    endptr: *mut SharedThinCstr<'a>,
+    endptr: Option<&mut Option<SharedThinCstr<'a>>>,
     base: c_int,
 ) -> c_long {
-    let mut cur = str;
-    while cur
-        .first()
-        .map(|c| super::is_space(c as _) == 1)
-        .unwrap_or(false)
-    {}
+    if base != 10 {
+        todo!();
+    }
+    let mut chars = str.into_iter().enumerate().peekable();
 
-    0
+    while chars
+        .peek()
+        .map(|&(_, c)| super::is_space(c as _))
+        .unwrap_or(false)
+    {
+        chars.next();
+    }
+
+    let mut negate = false;
+    let mut acc: i64 = 0;
+
+    let write_end = |pos: usize| {
+        if let Some(endptr) = endptr {
+            *endptr = Some(unsafe { str.add(pos) });
+        }
+    };
+
+    let mut last_pos;
+
+    let c = chars.peek();
+    match c {
+        Some((pos, b'+')) => {
+            last_pos = *pos;
+            chars.next();
+        }
+        Some((pos, b'-')) => {
+            last_pos = *pos;
+            chars.next();
+            negate = true
+        }
+        Some((_, c)) if !c.is_ascii_digit() => {
+            write_end(0);
+            set_errno(EINVAL);
+            return 0;
+        }
+        None => {
+            write_end(0);
+            set_errno(EINVAL);
+            return 0;
+        }
+        Some((pos, _)) => {
+            last_pos = *pos;
+        }
+    }
+
+    loop {
+        match chars.next() {
+            Some((pos, c)) if c.is_ascii_digit() => {
+                last_pos = pos;
+                let n = c - b'0';
+                acc *= 10;
+                if negate {
+                    acc -= n as i64;
+                } else {
+                    acc += n as i64;
+                }
+            }
+            Some((pos, _)) => {
+                write_end(pos);
+                break;
+            }
+            None => {
+                write_end(last_pos + 1);
+                break;
+            }
+        }
+    }
+
+    acc
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{cstr, utils::SharedThinCstr};
+
+    fn test_strtol(str: SharedThinCstr<'_>, expected: i64, base: i32, parsed_len: usize) {
+        let mut end = None;
+        let result = super::parse_long(str, Some(&mut end), base);
+        assert_eq!(result, expected);
+        let end = end.unwrap();
+        let read = end.as_raw() as usize - str.as_raw() as usize;
+        assert_eq!(read, parsed_len);
+    }
+
+    #[test]
+    fn l_zero() {
+        test_strtol(cstr!("0"), 0, 10, 1);
+    }
+
+    #[test]
+    fn l_ten() {
+        test_strtol(cstr!("10"), 10, 10, 2);
+    }
+
+    #[test]
+    fn l_eleven() {
+        test_strtol(cstr!("11"), 11, 10, 2);
+    }
+
+    #[test]
+    fn negative_zero() {
+        test_strtol(cstr!("-0"), 0, 10, 2);
+    }
+
+    #[test]
+    fn negative_ten() {
+        test_strtol(cstr!("-10"), -10, 10, 3);
+    }
+
+    #[test]
+    fn negative_eleven() {
+        test_strtol(cstr!("-11"), -11, 10, 3);
+    }
+
+    #[test]
+    fn l_leading_whitespace() {
+        test_strtol(cstr!("\t 1"), 1, 10, 3);
+    }
+
+    #[test]
+    fn l_trailing_garbage_one() {
+        test_strtol(cstr!("3uwu"), 3, 10, 1);
+    }
+
+    #[test]
+    fn l_trailing_garbage_two() {
+        test_strtol(cstr!("32uwu"), 32, 10, 2);
+    }
+
+    #[test]
+    fn l_trailing_garbage_many() {
+        test_strtol(cstr!("12345uwu"), 12345, 10, 5);
+    }
+
+    #[test]
+    fn l_long_max() {
+        test_strtol(cstr!("9223372036854775807"), i64::MAX, 10, 19);
+    }
+
+    #[test]
+    fn l_long_min() {
+        test_strtol(cstr!("-9223372036854775808"), i64::MIN, 10, 20);
+    }
 }

libuwuc/src/lib.rs

@@ -1,5 +1,7 @@
 #![no_std]
 #![feature(c_variadic)]
+#![feature(thread_local)]
+
 #![warn(unreachable_pub)]
 #![warn(rust_2018_idioms)]
 #![allow(clippy::missing_safety_doc)]
@@ -9,6 +11,7 @@ extern crate std;
 
 pub mod alloc;
 pub mod env;
+pub mod error;
 pub mod fmt;
 pub mod io;
 pub mod mem;

libuwuc/src/sys/x86_64/syscall/mod.rs

@@ -12,6 +12,9 @@ macro_rules! syscall {
             "syscall",
             in("rdi") $number,
             lateout("rax") out,
+            // rcx and r11 are clobbered https://github.com/torvalds/linux/blob/3b517966c5616ac011081153482a5ba0e91b17ff/tools/include/nolibc/arch-x86_64.h#L19
+            out("rcx") _,
+            out("r11") _,
         );
         out
     }};
@@ -22,6 +25,9 @@ macro_rules! syscall {
             in("rax") $number,
             in("rdi") $arg1,
             lateout("rax") out,
+            // rcx and r11 are clobbered
+            out("rcx") _,
+            out("r11") _,
         );
         out
     }};
@@ -33,6 +39,9 @@ macro_rules! syscall {
             in("rdi") $arg1,
             in("rsi") $arg2,
             lateout("rax") out,
+            // rcx and r11 are clobbered
+            out("rcx") _,
+            out("r11") _,
         );
         out
     }};
@@ -45,6 +54,9 @@ macro_rules! syscall {
             in("rsi") $arg2,
             in("rdx") $arg3,
             lateout("rax") out,
+            // rcx and r11 are clobbered
+            out("rcx") _,
+            out("r11") _,
         );
         out
     }};
@@ -58,6 +70,9 @@ macro_rules! syscall {
             in("rdx") $arg3,
             in("r10") $arg4,
             lateout("rax") out,
+            // rcx and r11 are clobbered
+            out("rcx") _,
+            out("r11") _,
         );
         out
     }};
@@ -72,6 +87,9 @@ macro_rules! syscall {
             in("r10") $arg4,
             in("r8") $arg5,
             lateout("rax") out,
+            // rcx and r11 are clobbered
+            out("rcx") _,
+            out("r11") _,
         );
         out
     }};
@@ -87,6 +105,9 @@ macro_rules! syscall {
             in("r8") $arg5,
             in("r9") $arg6,
             lateout("rax") out,
+            // rcx and r11 are clobbered
+            out("rcx") _,
+            out("r11") _,
         );
         out
     }};

rawc/src/rt.rs

@@ -5,3 +5,8 @@ pub extern "C" fn __stack_chk_fail() -> ! {
         libuwuc::start::abort();
     }
 }
+
+#[no_mangle]
+pub extern "C" fn __errno_location() -> *const i32 {
+    libuwuc::error::errno_location()
+}

rawc/src/stdlib.rs

@@ -1,3 +1,5 @@
+use core::ffi::{c_int, c_long};
+
 use libuwuc::utils::SharedThinCstr;
 
 #[no_mangle]
@@ -15,6 +17,21 @@ pub unsafe extern "C" fn exit(code: i32) -> ! {
     libuwuc::start::exit(code as i64 as _)
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn strtol(nptr: *const u8, endptr: *mut *const u8, base: c_int) -> c_long {
+    let str = SharedThinCstr::from_raw(nptr);
+    libuwuc::fmt::parse::parse_long(
+        str,
+        core::mem::transmute::<*mut *const u8, Option<&mut Option<SharedThinCstr<'_>>>>(endptr),
+        base,
+    )
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn strtoll(nptr: *const u8, endptr: *mut *const u8, base: c_int) -> c_long {
+    strtol(nptr, endptr, base)
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn getenv(name: *const u8) -> *const u8 {
     libuwuc::env::getenv(SharedThinCstr::from_raw(name))