rewrite the stdio module to be less broken. also add sehbang support

Cargo.lock

@@ -168,23 +168,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "console"
-version = "0.12.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0b1aacfaffdbff75be81c15a399b4bedf78aaefe840e8af1d299ac2ade885d2"
-dependencies = [
- "encode_unicode",
- "lazy_static",
- "libc",
- "regex",
- "terminal_size",
- "termios",
- "unicode-width",
- "winapi",
- "winapi-util",
-]
-
 [[package]]
 name = "crsn"
 version = "0.1.0"
@@ -228,8 +211,8 @@ dependencies = [
 name = "crsn_stdio"
 version = "0.1.0"
 dependencies = [
- "console",
  "crsn",
+ "libc",
 ]
 
 [[package]]
@@ -274,12 +257,6 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4c53dc3a653e0f64081026e4bf048d48fec9fce90c66e8326ca7292df0ff2d82"
 
-[[package]]
-name = "encode_unicode"
-version = "0.3.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a357d28ed41a50f9c765dbfe56cbc04a64e53e5fc58ba79fbc34c10ef3df831f"
-
 [[package]]
 name = "env_logger"
 version = "0.7.1"
@@ -394,9 +371,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.77"
+version = "0.2.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2f96b10ec2560088a8e76961b00d47107b3a625fecb76dedb29ee7ccbf98235"
+checksum = "2448f6066e80e3bfc792e9c98bf705b4b0fc6e8ef5b43e5889aff0eaa9c58743"
 
 [[package]]
 name = "lock_api"
@@ -996,25 +973,6 @@ dependencies = [
  "winapi-util",
 ]
 
-[[package]]
-name = "terminal_size"
-version = "0.1.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9a14cd9f8c72704232f0bfc8455c0e861f0ad4eb60cc9ec8a170e231414c1e13"
-dependencies = [
- "libc",
- "winapi",
-]
-
-[[package]]
-name = "termios"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f0fcee7b24a25675de40d5bb4de6e41b0df07bc9856295e7e2b3a3600c400c2"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "textwrap"
 version = "0.11.0"

README.md

@@ -15,10 +15,16 @@ It's probably faster than you need for most things, actually.
 
 You can slow it down using the `-C` argument, or using sleep instructions.
 
-#### What if I don't enjoy writing assembly that looks like weird Lisp?
+### What if I don't enjoy writing assembly that looks like weird Lisp?
 
 Maybe this is not for you
 
+### Shebang?
+
+Yes! You can use crsn as a scripting language!
+
+The first line from a source file is skipped if it starts with `#!`
+
 ### Contributing
 
 Yup, go ahead. You can also develop your own private *crsn* extensions, they work like plugins.

crsn/crsn-sexp/src/lib.rs

@@ -144,7 +144,7 @@ fn atom_of_string(s: String) -> Atom {
 
 // returns the char it found, and the new pos if you wish to consume that char
 fn peek(s: &str, pos: usize) -> ERes<(char, usize)> {
-    trace!("peek {}", pos);
+    //trace!("peek {}", pos);
     if pos == s.len() { return err("unexpected eof", s, pos); }
     if s.is_char_boundary(pos) {
         let ch = s[pos..].chars().next().unwrap();
@@ -158,7 +158,7 @@ fn peek(s: &str, pos: usize) -> ERes<(char, usize)> {
 
 // returns the char it found, and the new pos if you wish to consume that char
 fn peekn(s: &str, nth: usize, pos: usize) -> Option<(char, usize)> {
-    trace!("peekn {}", pos);
+    //trace!("peekn {}", pos);
     if nth == 0 {
         panic!("peekn with nth=0");
     }
@@ -183,7 +183,7 @@ fn peekn(s: &str, nth: usize, pos: usize) -> Option<(char, usize)> {
 }
 
 fn expect(s: &str, pos: &mut usize, c: char) -> ERes<()> {
-    trace!("expect {}", pos);
+    //trace!("expect {}", pos);
     let (ch, next) = peek(s, *pos)?;
     *pos = next;
     if ch == c {
@@ -208,7 +208,7 @@ fn consume_until_newline(s: &str, pos: &mut usize) -> ERes<()> {
 
 // zero or more spaces
 fn zspace(s: &str, pos: &mut usize) -> ERes<()> {
-    trace!("zspace {}", pos);
+    //trace!("zspace {}", pos);
     loop {
         if *pos == s.len() {
             return Ok(());
@@ -226,7 +226,7 @@ fn zspace(s: &str, pos: &mut usize) -> ERes<()> {
 }
 
 fn parse_quoted_atom(s: &str, quote: char, pos: &mut usize) -> ERes<Atom> {
-    trace!("parse_quoted_atom {}", pos);
+    //trace!("parse_quoted_atom {}", pos);
     let pos0 = *pos;
     let mut cs: String = String::new();
 
@@ -266,7 +266,7 @@ fn parse_quoted_atom(s: &str, quote: char, pos: &mut usize) -> ERes<Atom> {
 }
 
 fn parse_unquoted_atom(s: &str, pos: &mut usize) -> ERes<Atom> {
-    trace!("parse_unquoted_atom {}", pos);
+    //trace!("parse_unquoted_atom {}", pos);
     let mut cs: String = String::new();
 
     loop {
@@ -288,7 +288,7 @@ fn parse_unquoted_atom(s: &str, pos: &mut usize) -> ERes<Atom> {
 }
 
 fn parse_atom(s: &str, pos: &mut usize) -> ERes<Atom> {
-    trace!("parse_atom {}", pos);
+    //trace!("parse_atom {}", pos);
     let (ch, _) = peek(s, *pos)?;
 
     if ch == '"' {
@@ -309,7 +309,7 @@ fn parse_atom(s: &str, pos: &mut usize) -> ERes<Atom> {
 }
 
 fn parse_list(s: &str, pos: &mut usize) -> ERes<Vec<Sexp>> {
-    trace!("parse_list {}", pos);
+    //trace!("parse_list {}", pos);
     zspace(s, pos)?;
     expect(s, pos, '(')?;
 
@@ -331,7 +331,7 @@ fn parse_list(s: &str, pos: &mut usize) -> ERes<Vec<Sexp>> {
 }
 
 fn parse_sexp(s: &str, pos: &mut usize) -> ERes<Sexp> {
-    trace!("parse_sexp {}", pos);
+    //trace!("parse_sexp {}", pos);
     zspace(s, pos)?;
     let (c, _) = peek(s, *pos)?;
     let r = if c == '(' {

crsn/src/asm/instr/cond.rs

@@ -5,6 +5,55 @@ use sexp::SourcePosition;
 
 use crate::asm::error::CrsnError;
 
+/// Condition flag
+#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
+pub enum Flag {
+    /// Equality
+    Equal,
+    /// Equal to zero
+    Zero,
+    /// A < B
+    Lower,
+    /// A > B
+    Greater,
+    /// A > 0
+    Positive,
+    /// A < 0
+    Negative,
+    /// Arithmetic operation caused an integer operand to overflow
+    Overflow,
+    /// Arithmetic (or other) operation was invalid.
+    /// Example: division by zero
+    Invalid,
+    /// Arithmetic carry
+    Carry,
+    // Full
+    Full,
+    // Empty
+    Empty,
+    // Empty
+    Eof,
+}
+
+impl From<Flag> for Cond {
+    fn from(flag: Flag) -> Self {
+        match flag {
+            Flag::Equal => Cond::Equal,
+            Flag::Zero => Cond::Zero,
+            Flag::Lower => Cond::Lower,
+            Flag::Greater => Cond::Greater,
+            Flag::Positive => Cond::Positive,
+            Flag::Negative => Cond::Negative,
+            Flag::Overflow => Cond::Overflow,
+            Flag::Invalid => Cond::Invalid,
+            Flag::Carry => Cond::Carry,
+            Flag::Full => Cond::Full,
+            Flag::Empty => Cond::Empty,
+            Flag::Eof => Cond::Eof,
+        }
+    }
+}
+
 /// Condition flag
 #[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
 pub enum Cond {
@@ -53,6 +102,10 @@ pub enum Cond {
     Empty,
     /// Not empty
     NotEmpty,
+    // Empty
+    Eof,
+    /// Not empty
+    NotEof,
 }
 
 pub fn parse_cond(text: &str, pos: &SourcePosition) -> Result<Cond, CrsnError> {
@@ -77,6 +130,8 @@ pub fn parse_cond(text: &str, pos: &SourcePosition) -> Result<Cond, CrsnError> {
         "nf" | "nfull" => Cond::NotFull,
         "ok" | "val" | "valid" => Cond::Valid,
         "inval" | "invalid" | "nval" | "nok" => Cond::Invalid,
+        "eof" => Cond::Eof,
+        "neof" => Cond::NotEof,
         "ov" => Cond::Overflow,
         "nov" => Cond::NotOverflow,
         _ => {
@@ -85,6 +140,13 @@ pub fn parse_cond(text: &str, pos: &SourcePosition) -> Result<Cond, CrsnError> {
     })
 }
 
+impl Display for Flag {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        let cond : Cond = (*self).into();
+        write!(f, "{}", cond)
+    }
+}
+
 impl Display for Cond {
     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         f.write_str(match self {
@@ -110,6 +172,8 @@ impl Display for Cond {
             Cond::NotCarry => "nc",
             Cond::Invalid => "inval",
             Cond::Valid => "valid",
+            Cond::Eof => "eof",
+            Cond::NotEof => "neof",
         })
     }
 }
@@ -147,6 +211,9 @@ impl Not for Cond {
 
             Cond::Invalid => Cond::Valid,
             Cond::Valid => Cond::Invalid,
+
+            Cond::NotEof => Cond::Eof,
+            Cond::Eof => Cond::NotEof,
         }
     }
 }

crsn/src/asm/instr/flatten.rs

@@ -39,6 +39,8 @@ impl Flatten for InstrWithBranches {
         let parent_pos = self.pos;
 
         if let Some(branches) = self.branches {
+            // trace!("Branches {:?}", branches);
+
             let labels = HashMap::<Cond, u32>::new();
             let branch_count = branches.len();
             let end_lbl = Label::unique(label_num);

crsn/src/asm/mod.rs

@@ -23,6 +23,17 @@ pub fn assemble(source: &str, uniq : &CrsnUniq, mut parsers: Vec<Box<dyn CrsnExt
         p.init(uniq);
     }
 
+    // remove first line if it looks like a shebang
+    let source = if source.starts_with("#!") {
+        if let Some(nl) = source.find('\n') {
+            &source[nl + 1..]
+        } else {
+            source
+        }
+    } else {
+        source
+    };
+
     let pcx = ParserContext {
         parsers: &parsers,
         state: RefCell::new(ParserState {

crsn/src/asm/parse/arg_parser.rs

@@ -7,6 +7,7 @@ use crate::asm::parse::ParserContext;
 use crate::asm::parse::sexp_expect::expect_string_atom;
 
 /// Utility for argument parsing
+#[derive(Debug)]
 pub struct TokenParser<'a> {
     orig_len: usize,
     args: Vec<Sexp>,

crsn/src/asm/parse/mod.rs

@@ -20,6 +20,7 @@ pub mod parse_op;
 pub mod arg_parser;
 pub mod parse_routine;
 
+#[derive(Debug)]
 pub struct ParserContext<'a> {
     /// Extension modules
     pub parsers: &'a [Box<dyn CrsnExtension>],
@@ -27,7 +28,7 @@ pub struct ParserContext<'a> {
     pub state: RefCell<ParserState>,
 }
 
-#[derive(Default)]
+#[derive(Default, Debug)]
 pub struct ParserState {
     /// Register aliases within the routine
     pub reg_aliases: HashMap<RegisterAlias, Register>,

crsn/src/asm/parse/parse_instr.rs

@@ -63,10 +63,11 @@ pub fn parse_instructions(items: impl Iterator<Item=Sexp>, pos: &SourcePosition,
             .collect::<Vec<_>>();
 
         let arg_tokens = TokenParser::new(toki.take(token_count - branch_tokens.len()).collect(), &listpos, pcx);
+        // debug!("branch_tokens: {:#?}", branch_tokens);
 
         let branches = {
             let mut branches = vec![];
-            for t in branch_tokens {
+            for t in branch_tokens.into_iter().rev() {
                 branches.push(parse_cond_branch(t, pcx)?);
             }
             if branches.is_empty() {

crsn/src/builtin/exec.rs

@@ -4,12 +4,12 @@ use sexp::Sexp;
 
 use crate::asm::data::{Rd, RdData};
 use crate::asm::data::literal::Addr;
-use crate::asm::instr::Cond;
 use crate::builtin::defs::{Barrier, BuiltinOp};
 use crate::module::{EvalRes, OpTrait};
 use crate::runtime::fault::Fault;
 use crate::runtime::frame::StackFrame;
 use crate::runtime::run_thread::{state::RunState, ThreadInfo};
+use crate::asm::instr::cond::Flag;
 
 impl OpTrait for BuiltinOp {
     fn execute(&self, info: &ThreadInfo, state: &mut RunState) -> Result<EvalRes, Fault> {
@@ -138,7 +138,7 @@ impl OpTrait for BuiltinOp {
                 }
                 if !dropped {
                     warn!("Object {:#x} to del does not exist!", x);
-                    state.set_flag(Cond::Invalid, true);
+                    state.set_flag(Flag::Invalid, true);
                 }
             }
         }

crsn/src/runtime/frame/status.rs

@@ -3,6 +3,7 @@ use std::fmt;
 
 use crate::asm::data::literal::{is_negative, is_positive, Value};
 use crate::asm::instr::Cond;
+use crate::asm::instr::cond::Flag;
 
 #[derive(Default, Clone, Debug)]
 pub struct StatusFlags {
@@ -28,6 +29,8 @@ pub struct StatusFlags {
     pub full: bool,
     /// Buffer empty
     pub empty: bool,
+    /// Stream ended
+    pub eof: bool,
 }
 
 impl StatusFlags {
@@ -49,6 +52,7 @@ impl StatusFlags {
         if self.carry { val |= 0x100; }
         if self.full { val |= 0x200; }
         if self.empty { val |= 0x400; }
+        if self.eof { val |= 0x800; }
         val
     }
 
@@ -64,6 +68,7 @@ impl StatusFlags {
         if val & 0x100 != 0 { self.carry = true; }
         if val & 0x200 != 0 { self.full = true; }
         if val & 0x400 != 0 { self.empty = true; }
+        if val & 0x800 != 0 { self.eof = true; }
     }
 
     #[inline(always)]
@@ -98,50 +103,49 @@ impl StatusFlags {
             Cond::NotFull => !self.full,
             Cond::Empty => self.empty,
             Cond::NotEmpty => !self.empty,
+            Cond::Eof => self.eof,
+            Cond::NotEof => !self.eof,
         }
     }
 
     #[inline(always)]
-    pub fn set(&mut self, cond: Cond) {
+    pub fn set(&mut self, cond: Flag, val : bool) {
         match cond {
-            Cond::Equal => {
+            Flag::Equal => {
-                self.equal = true;
+                self.equal = val;
             }
-            Cond::Zero => {
+            Flag::Zero => {
-                self.zero = true;
+                self.zero = val;
             }
-            Cond::Lower => {
+            Flag::Lower => {
-                self.lower = true;
+                self.lower = val;
             }
-            Cond::Greater => {
+            Flag::Greater => {
-                self.lower = false;
+                self.greater = val;
-                self.equal = false;
-                self.greater = true;
             }
-            Cond::Positive => {
+            Flag::Positive => {
-                self.positive = true;
+                self.positive = val;
             }
-            Cond::Negative => {
+            Flag::Negative => {
-                self.negative = true;
+                self.negative = val;
             }
-            Cond::Overflow => {
+            Flag::Overflow => {
-                self.overflow = true;
+                self.overflow = val;
             }
-            Cond::Invalid => {
+            Flag::Invalid => {
-                self.invalid = true;
+                self.invalid = val;
             }
-            Cond::Carry => {
+            Flag::Carry => {
-                self.carry = true;
+                self.carry = val;
             }
-            Cond::Empty => {
+            Flag::Empty => {
-                self.empty = true;
+                self.empty = val;
             }
-            Cond::Full => {
+            Flag::Full => {
-                self.full = true;
+                self.full = val;
             }
-            other => {
+            Flag::Eof => {
-                error!("Cannot set cond by {:?}", other);
+                self.eof = val;
-                // ...and do nothing. Don't panic, we don't want to crash the runtime!
             }
         }
     }
@@ -183,6 +187,9 @@ impl Display for StatusFlags {
         if self.empty {
             f.write_str(" Emp")?;
         }
+        if self.eof {
+            f.write_str(" Eof")?;
+        }
         f.write_str(" ]")?;
 
         Ok(())

crsn/src/runtime/run_thread/state.rs

@@ -9,6 +9,7 @@ use crate::runtime::frame::{CallStack, REG_COUNT, StackFrame};
 use std::sync::Arc;
 use crate::runtime::run_thread::ThreadInfo;
 use nudge::{likely};
+use crate::asm::instr::cond::Flag;
 
 pub struct RunState {
     pub thread_info: Arc<ThreadInfo>,
@@ -51,10 +52,9 @@ impl RunState {
 
     /// Set a status flag. Only supports simple, positive conds (i.e. not GreaterOrEqual)
     #[inline(always)]
-    pub fn set_flag(&mut self, cond: Cond, set: bool) {
+    pub fn set_flag(&mut self, flag: Flag, set: bool) {
-        if set {
+        trace!("Flag {} = {:?}", flag, set);
-            self.frame.status.set(cond);
+        self.frame.status.set(flag, set);
-        }
     }
 
     /// Check status flags for a condition

crsn_arith/src/exec.rs

@@ -3,7 +3,6 @@ use std::ops::Rem;
 use num_traits::PrimInt;
 
 use crsn::asm::data::{Rd, Wr};
-use crsn::asm::instr::Cond;
 use crsn::module::{EvalRes, OpTrait};
 use crsn::runtime::fault::Fault;
 use crsn::runtime::run_thread::{state::RunState, ThreadInfo};
@@ -12,6 +11,7 @@ use crsn::sexp::Sexp;
 use crsn::utils::A;
 
 use crate::defs::ArithOp;
+use crsn::asm::instr::cond::Flag;
 
 impl OpTrait for ArithOp {
     fn execute(&self, _ti: &ThreadInfo, state: &mut RunState) -> Result<EvalRes, Fault> {
@@ -26,9 +26,9 @@ impl OpTrait for ArithOp {
                 state.clear_status();
                 let x = state.read(a)?;
                 let y = state.read(b)?;
-                state.set_flag(Cond::Equal, x == y);
+                state.set_flag(Flag::Equal, x == y);
-                state.set_flag(Cond::Lower, x < y);
+                state.set_flag(Flag::Lower, x < y);
-                state.set_flag(Cond::Greater, x > y);
+                state.set_flag(Flag::Greater, x > y);
                 // Test flags are set when both arguments have the property
                 if x == y {
                     state.update_status(x);
@@ -39,9 +39,9 @@ impl OpTrait for ArithOp {
                 let val = state.read(val)?;
                 let a = state.read(a)?;
                 let b = state.read(b)?;
-                state.set_flag(Cond::Equal, val >= a && val <= b);
+                state.set_flag(Flag::Equal, val >= a && val <= b);
-                state.set_flag(Cond::Lower, val < a);
+                state.set_flag(Flag::Lower, val < a);
-                state.set_flag(Cond::Greater, val > b);
+                state.set_flag(Flag::Greater, val > b);
                 state.update_status(val);
             }
             ArithOp::Add { dst, a, b } => {
@@ -54,7 +54,7 @@ impl OpTrait for ArithOp {
                     (x.wrapping_add(y), true)
                 };
                 state.update_status(res);
-                state.set_flag(Cond::Overflow, ov);
+                state.set_flag(Flag::Overflow, ov);
                 state.write(dst, res)?;
             }
             ArithOp::Sub { dst, a, b } => {
@@ -67,7 +67,7 @@ impl OpTrait for ArithOp {
                     (x.wrapping_sub(y), true)
                 };
                 state.update_status(res);
-                state.set_flag(Cond::Overflow, ov);
+                state.set_flag(Flag::Overflow, ov);
                 state.write(dst, res)?;
             }
             ArithOp::Mul { dst, a, b } => {
@@ -77,7 +77,7 @@ impl OpTrait for ArithOp {
                 let res = if let Some(v) = x.checked_mul(y) {
                     v
                 } else {
-                    state.set_flag(Cond::Overflow, true);
+                    state.set_flag(Flag::Overflow, true);
                     x.wrapping_mul(y)
                 };
                 state.update_status(res);
@@ -88,7 +88,7 @@ impl OpTrait for ArithOp {
                 let x = state.read(a)?;
                 let d = state.read(div)?;
                 if d == 0 {
-                    state.set_flag(Cond::Invalid, true);
+                    state.set_flag(Flag::Invalid, true);
                 } else {
                     let (res, remainder, ov) = if let Some(v) = x.checked_div(d) {
                         (v, x.rem(d), false)
@@ -96,7 +96,7 @@ impl OpTrait for ArithOp {
                         (x.wrapping_div(d), x.wrapping_rem(d), true)
                     };
                     state.update_status(res);
-                    state.set_flag(Cond::Overflow, ov);
+                    state.set_flag(Flag::Overflow, ov);
                     state.write(dst, res)?;
                     state.write(rem, remainder)?;
                 }
@@ -106,7 +106,7 @@ impl OpTrait for ArithOp {
                 let x = state.read(a)?;
                 let d = state.read(div)?;
                 if d == 0 {
-                    state.set_flag(Cond::Invalid, true);
+                    state.set_flag(Flag::Invalid, true);
                 } else {
                     let (remainder, ov) = if let Some(v) = x.checked_rem(d) {
                         (v, false)
@@ -114,7 +114,7 @@ impl OpTrait for ArithOp {
                         (x.wrapping_rem(d), true)
                     };
                     state.update_status(remainder);
-                    state.set_flag(Cond::Overflow, ov);
+                    state.set_flag(Flag::Overflow, ov);
                     state.write(dst, remainder)?;
                 }
             }
@@ -154,7 +154,7 @@ impl OpTrait for ArithOp {
                 let x = state.read(a)?;
                 let y = state.read(n)?;
                 if y > u32::MAX as u64 {
-                    state.set_flag(Cond::Invalid, true);
+                    state.set_flag(Flag::Invalid, true);
                 } else {
                     let res = x.rotate_left(y as u32);
                     state.update_status(res);
@@ -166,7 +166,7 @@ impl OpTrait for ArithOp {
                 let x = state.read(a)?;
                 let y = state.read(n)?;
                 if y > u32::MAX as u64 {
-                    state.set_flag(Cond::Invalid, true);
+                    state.set_flag(Flag::Invalid, true);
                 } else {
                     let res = x.rotate_right(y as u32);
                     state.update_status(res);
@@ -194,7 +194,7 @@ impl OpTrait for ArithOp {
                 let x = state.read(a)?;
                 let y = state.read(n)?;
                 if y > u32::MAX as u64 {
-                    state.set_flag(Cond::Invalid, true);
+                    state.set_flag(Flag::Invalid, true);
                 } else {
                     let res = x.signed_shr(y as u32);
                     state.update_status(res);

crsn_buf/src/exec.rs

@@ -1,7 +1,6 @@
 use std::collections::{HashMap, VecDeque};
 
 use crsn::asm::data::literal::Value;
-use crsn::asm::instr::Cond;
 use crsn::module::{EvalRes, OpTrait};
 use crsn::runtime::fault::Fault;
 use crsn::runtime::run_thread::{state::RunState, ThreadInfo};
@@ -10,6 +9,7 @@ use crsn::sexp::{Sexp, atom_qs};
 use crsn::utils::A;
 
 use crate::defs::{BufOps, BufValue};
+use crsn::asm::instr::cond::Flag;
 
 #[derive(Debug, Default)]
 struct ExtData {
@@ -71,10 +71,10 @@ impl OpTrait for BufOps {
                     let empty = stack.is_empty();
                     state.write(dst, val)?;
                     state.update_status(val);
-                    state.set_flag(Cond::Empty, empty);
+                    state.set_flag(Flag::Empty, empty);
                 } else {
-                    state.set_flag(Cond::Empty, true);
+                    state.set_flag(Flag::Empty, true);
-                    state.set_flag(Cond::Overflow, true);
+                    state.set_flag(Flag::Overflow, true);
                 }
             }
 
@@ -89,7 +89,7 @@ impl OpTrait for BufOps {
                     state.update_status(val);
                     state.write(dst, val)?;
                 } else {
-                    state.set_flag(Cond::Overflow, true);
+                    state.set_flag(Flag::Overflow, true);
                 }
             }
 
@@ -115,7 +115,7 @@ impl OpTrait for BufOps {
                 } else if idx == stack.len() {
                     stack.push_back(val);
                 } else {
-                    state.set_flag(Cond::Overflow, true);
+                    state.set_flag(Flag::Overflow, true);
                 }
             }
 
@@ -131,7 +131,7 @@ impl OpTrait for BufOps {
                 } else if idx == stack.len() {
                     stack.push_back(val);
                 } else {
-                    state.set_flag(Cond::Overflow, true);
+                    state.set_flag(Flag::Overflow, true);
                 }
             }
 
@@ -146,9 +146,9 @@ impl OpTrait for BufOps {
                     let empty = stack.is_empty();
                     state.update_status(val);
                     state.write(dst, val)?;
-                    state.set_flag(Cond::Empty, empty);
+                    state.set_flag(Flag::Empty, empty);
                 } else {
-                    state.set_flag(Cond::Overflow, true);
+                    state.set_flag(Flag::Overflow, true);
                 }
             }
 

crsn_screen/src/exec.rs

@@ -4,7 +4,6 @@ use std::time::{Duration, Instant};
 use minifb::{Key, MouseButton, MouseMode, ScaleMode, Window, WindowOptions};
 
 use crsn::asm::data::literal::Value;
-use crsn::asm::instr::Cond;
 use crsn::module::{EvalRes, OpTrait};
 use crsn::runtime::fault::Fault;
 use crsn::runtime::run_thread::{state::RunState, ThreadInfo};
@@ -13,6 +12,7 @@ use crsn::sexp::Sexp;
 use crsn::utils::A;
 
 use crate::defs::ScreenOp;
+use crsn::asm::instr::cond::Flag;
 
 #[derive(Debug)]
 struct Opts {
@@ -87,7 +87,7 @@ impl OpTrait for ScreenOp {
                     }
                     other => {
                         warn!("Bad screen opt: {}", other);
-                        state.set_flag(Cond::Invalid, true);
+                        state.set_flag(Flag::Invalid, true);
                     }
                 }
             }
@@ -115,7 +115,7 @@ impl OpTrait for ScreenOp {
                         w.update();
                     }
                     None => {
-                        state.set_flag(Cond::Invalid, true);
+                        state.set_flag(Flag::Invalid, true);
                     }
                 }
             }
@@ -129,7 +129,7 @@ impl OpTrait for ScreenOp {
                 let backend: &mut Backend = state.ext_mut();
 
                 if x >= backend.width as u64 || y >= backend.height as u64 {
-                    state.set_flag(Cond::Overflow, true);
+                    state.set_flag(Flag::Overflow, true);
                     return Ok(eres);
                 }
 
@@ -138,7 +138,7 @@ impl OpTrait for ScreenOp {
                         let index = y * backend.width as u64 + x;
                         if index as usize > backend.buffer.len() {
                             warn!("Screen set pixel out of bounds");
-                            state.set_flag(Cond::Invalid, true);
+                            state.set_flag(Flag::Invalid, true);
                         } else {
                             backend.buffer[index as usize] = color as u32;
 
@@ -148,7 +148,7 @@ impl OpTrait for ScreenOp {
                         }
                     }
                     None => {
-                        state.set_flag(Cond::Invalid, true);
+                        state.set_flag(Flag::Invalid, true);
                     }
                 }
             }
@@ -162,7 +162,7 @@ impl OpTrait for ScreenOp {
                         debug!("mp = {:?}", mp);
                         match mp {
                             None => {
-                                state.set_flag(Cond::Overflow, true);
+                                state.set_flag(Flag::Overflow, true);
                             }
                             Some((xf, yf)) => {
                                 let xval = xf.round() as u64;
@@ -174,7 +174,7 @@ impl OpTrait for ScreenOp {
                         }
                     }
                     None => {
-                        state.set_flag(Cond::Invalid, true);
+                        state.set_flag(Flag::Invalid, true);
                     }
                 }
             }
@@ -187,7 +187,7 @@ impl OpTrait for ScreenOp {
                     Some(w) => {
                         match num {
                             None => {
-                                state.set_flag(Cond::Invalid, true);
+                                state.set_flag(Flag::Invalid, true);
                             }
                             Some(kn) => {
                                 let down = w.is_key_down(kn) as u64;
@@ -197,7 +197,7 @@ impl OpTrait for ScreenOp {
                         }
                     }
                     None => {
-                        state.set_flag(Cond::Invalid, true);
+                        state.set_flag(Flag::Invalid, true);
                     }
                 }
             }
@@ -210,7 +210,7 @@ impl OpTrait for ScreenOp {
                     1 => Some(MouseButton::Right),
                     2 => Some(MouseButton::Middle),
                     _ => {
-                        state.set_flag(Cond::Invalid, true);
+                        state.set_flag(Flag::Invalid, true);
                         None
                     }
                 };
@@ -225,7 +225,7 @@ impl OpTrait for ScreenOp {
                         }
                     }
                     None => {
-                        state.set_flag(Cond::Invalid, true);
+                        state.set_flag(Flag::Invalid, true);
                     }
                 }
             }

crsn_stdio/Cargo.toml

@@ -8,4 +8,4 @@ edition = "2018"
 
 [dependencies]
 crsn = { path = "../crsn" }
-console = "0.12.0"
+libc = "0.2.79"

crsn_stdio/src/lib.rs

@@ -6,43 +6,139 @@ use crsn::module::{CrsnExtension, ParseRes, CrsnUniq};
 use crsn::runtime::fault::Fault;
 use crsn::runtime::run_thread::{RunState};
 use crsn::sexp::SourcePosition;
-use std::io::{Write};
 use std::convert::TryFrom;
-use crsn::asm::instr::Cond;
+use std::io;
-use console::Term;
+use crsn::asm::instr::cond::Flag;
+
+mod console {
+    use std::{io};
+    use std::os::unix::io::RawFd;
+
+    use std::ffi::c_void;
+    use std::mem::{self, MaybeUninit};
+
+    fn setup_fd(fd: RawFd) -> io::Result<libc::termios> {
+        use libc::*;
+
+        let mut tio = MaybeUninit::uninit();
+        if 0 != unsafe { tcgetattr(fd, tio.as_mut_ptr()) } {
+            return Err(io::Error::last_os_error());
+        }
+        let mut tio = unsafe { MaybeUninit::assume_init(tio) };
+        let old_tio : termios = unsafe { mem::transmute_copy(&tio) };
+
+        tio.c_iflag &= !(/*BRKINT |*/ /*ICRNL |*/ INPCK | ISTRIP | IXON);
+        tio.c_oflag |= ONLCR;
+        tio.c_cflag |= CS8;
+        tio.c_lflag &= !(ECHO | ICANON | IEXTEN /*| ISIG*/);
+        tio.c_cc[VMIN] = 1;
+        tio.c_cc[VTIME] = 0;
+        if 0 != unsafe { tcsetattr(fd, TCSANOW, &tio) } {
+            return Err(io::Error::last_os_error());
+        }
+
+        Ok(old_tio)
+    }
+
+    pub fn init_io() -> io::Result<libc::termios> {
+        setup_fd(libc::STDIN_FILENO)
+    }
+
+    pub fn read_byte() -> io::Result<u8> {
+        let mut buf = 0u8;
+        let len = unsafe { libc::read(libc::STDIN_FILENO, &mut buf as *mut u8 as *mut c_void, 1) };
+        if len <= 0 {
+            Err(io::Error::last_os_error())
+        } else {
+            Ok(buf as u8)
+        }
+    }
+
+    pub fn write_byte(b : u8) -> io::Result<()> {
+        let len = unsafe { libc::write(libc::STDOUT_FILENO, &b as *const u8 as *const c_void, 1) };
+        if len <= 0 {
+            Err(io::Error::last_os_error())
+        } else {
+            Ok(())
+        }
+    }
+
+    pub fn write_char(c : char) -> io::Result<()> {
+        let mut buf = [0u8; 4];
+        for b in c.encode_utf8(&mut buf).as_bytes() {
+            write_byte(*b)?;
+        }
+        Ok(())
+    }
+
+    pub fn read_char() -> io::Result<char> {
+        let first = read_byte()?;
+
+        if first & 0x80 == 0 {
+            return Ok(first as char);
+        }
+
+        let mut bytes = [first, 0, 0, 0];
+
+        let remain = if first & 0b1110_0000 == 0b1100_0000 {
+            1
+        } else if first & 0b1111_0000 == 0b1110_0000 {
+            2
+        } else /*if first & 0b1111_1000 == 0b1111_0000*/ {
+            3
+        };
+
+        for n in 1..=remain {
+            bytes[n] = read_byte()?;
+        }
+
+        std::str::from_utf8(&bytes[..=remain])
+            .map(|s| s.chars().nth(0).unwrap())
+            .map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))
+    }
+}
 
 #[derive(Debug, Clone)]
 pub struct StdioOps {
+    old_tio: Option<libc::termios>,
     hdl_stdin : Value,
+    hdl_stdin_raw : Value,
     hdl_stdout : Value,
-}
+    hdl_stdout_raw : Value,
-
-#[derive(Debug)]
-struct StdioData {
-    console: Term,
-}
-
-impl Default for StdioData {
-    fn default() -> Self {
-        Self {
-            console : Term::stdout()
-        }
-    }
 }
 
 impl StdioOps {
     pub fn new() -> Box<dyn CrsnExtension> {
         Box::new(Self {
+            old_tio: None,
             hdl_stdin: 0,
-            hdl_stdout: 0
+            hdl_stdin_raw: 0,
+            hdl_stdout: 0,
+            hdl_stdout_raw: 0,
         })
     }
 }
 
+impl Drop for StdioOps {
+    fn drop(&mut self) {
+        // Un-break the terminal
+        if let Some(tio) = self.old_tio.take() {
+            let _ = unsafe { libc::tcsetattr(libc::STDIN_FILENO, libc::TCSANOW, &tio) };
+        }
+    }
+}
+
 impl CrsnExtension for StdioOps {
     fn init(&mut self, uniq: &CrsnUniq) {
         self.hdl_stdin = uniq.unique_handle();
+        self.hdl_stdin_raw = uniq.unique_handle();
         self.hdl_stdout = uniq.unique_handle();
+        self.hdl_stdout_raw = uniq.unique_handle();
+
+        // This can fail if the input is not a tty
+        if let Ok(tio) = console::init_io() {
+            self.old_tio = Some(tio);
+        }
     }
 
     /// Get value of an extension-provided constant.
@@ -50,8 +146,10 @@ impl CrsnExtension for StdioOps {
     fn get_constant_value<'a>(&self, name: &str) -> Option<Value>
     {
         match name {
-            "stdin" => Some(self.hdl_stdin),
+            "cin" => Some(self.hdl_stdin),
-            "stdout" => Some(self.hdl_stdout),
+            "cin_r" => Some(self.hdl_stdin_raw),
+            "cout" => Some(self.hdl_stdout),
+            "cout_r" => Some(self.hdl_stdout_raw),
             _ => None
         }
     }
@@ -69,12 +167,36 @@ impl CrsnExtension for StdioOps {
                 -> Result<Option<Value>, Fault>
     {
         if handle == self.hdl_stdin {
-            let data = state.ext_mut::<StdioData>();
+            match console::read_char() {
-            return Ok(Some(data.console.read_char().expect("stdin read") as u64));
+                Ok(c) => {
+                    return Ok(Some(c as Value));
+                }
+                Err(e) => {
+                    state.set_flag(Flag::Invalid, true);
+                    if e.kind() != io::ErrorKind::InvalidData {
+                        state.set_flag(Flag::Eof, true);
+                    }
+                    return Ok(Some(0));
+                }
+            }
         }
 
-        if handle == self.hdl_stdout {
+        if handle == self.hdl_stdin_raw {
-            return Err(Fault::NotAllowed("Cannot read stdout".into()));
+            match console::read_byte() {
+                Ok(b) => {
+                    return Ok(Some(b as Value));
+                }
+                Err(_e) => {
+                    state.set_flag(Flag::Invalid, true);
+                    state.set_flag(Flag::Eof, true);
+                    return Ok(Some(0));
+                }
+            }
+        }
+
+        if handle == self.hdl_stdout || handle == self.hdl_stdout_raw {
+            state.set_flag(Flag::Invalid, true);
+            return Ok(Some(0));
         }
 
         Ok(None)
@@ -87,18 +209,25 @@ impl CrsnExtension for StdioOps {
 
         if handle == self.hdl_stdout {
             if let Ok(a_char) = char::try_from((value & 0xFFFF_FFFF) as u32) {
-                let data = state.ext_mut::<StdioData>();
+                if console::write_char(a_char).is_err() {
-
+                        state.set_flag(Flag::Eof, true);
-                let mut b = [0; 4];
+                }
-                data.console.write(a_char.encode_utf8(&mut b).as_bytes()).expect("stdout write");
             } else {
-                state.set_flag(Cond::Invalid, true);
+                state.set_flag(Flag::Invalid, true);
             }
             return Ok(Some(()));
         }
 
-        if handle == self.hdl_stdin {
+        if handle == self.hdl_stdout_raw {
-            return Err(Fault::NotAllowed("Cannot write stdin".into()));
+            if console::write_byte((value & 0xFF) as u8).is_err() {
+                state.set_flag(Flag::Eof, true);
+            }
+            return Ok(Some(()));
+        }
+
+        if handle == self.hdl_stdin || handle == self.hdl_stdin_raw {
+            state.set_flag(Flag::Invalid, true);
+            return Ok(Some(()));
         }
 
         Ok(None)

examples/number_array.csn

@@ -3,6 +3,6 @@
     (sym buf r7)
     (mkbf buf (r0 66 67 68 '\n'))
 
-    (bfrpop @stdout @buf)
+    (bfrpop @cout @buf)
     (s.nem -1)
 )

examples/stdio.csn

@@ -20,27 +20,27 @@
         (:next)
             (bfrd ch @str pos)
             (ret.ov)
-            (ld @stdout ch)
+            (ld @cout ch)
             (inc pos)
         (j :next)
     )
 
     (:loop)
-        (ld r0 @stdin)
+        (ld r0 @cin)
 
         (cmp r0 'q'
-            (eq? (ld @stdout '\n')
+            (eq? (ld @cout '\n')
                  (halt)))
 
         ; uppercase ASCII
         (cmp r0 'a' (<? (j :badchar)))
         (cmp r0 'z' (>? (j :badchar)))
         (sub r0 ' ')
-        (ld @stdout r0)
+        (ld @cout r0)
     (j :loop)
 
     (:badchar)
-        (ld @stdout r0)
+        (ld @cout r0)
         (bfrd r0 @TXT T_UNK)
         (call print r0)
     (j :loop)

examples/stdio_rev.csn

@@ -1,9 +1,9 @@
 (
     (mkbf r7)
-    (:r)(ld r0 @stdin)
+    (:r)(ld r0 @cin)
         (cmp r0 '\n' (eq? (j :q)))
         (bfpush @r7 r0)
         (j :r)
-    (:q)(bfpop @stdout @r7 (nem? (j :q)))
+    (:q)(bfpop @cout @r7 (nem? (j :q)))
-    (ld @stdout '\n')
+    (ld @cout '\n')
 )

examples/stdio_rot13.csn

@@ -1,6 +1,9 @@
+#!/usr/bin/env crsn
 (
     (:again)
-    (ld r0 @stdin (inval? (halt)))
+    (ld r0 @cin
+        (eof? (halt))
+        (inval? (j :again)))
     (rcmp r0 'A' 'Z'
         (eq? (ld r1 'A'))
         (ne? (rcmp r0 'a' 'z'
@@ -11,6 +14,6 @@
     (mod r0 26)
     (add r0 r1)
     (:print)
-    (ld @stdout r0)
+    (ld @cout r0)
     (j :again)
 )