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// -*- mode: java; -*-
// top-level default import
struct sys {
// libc bindings
/** https://www.man7.org/linux/man-pages/man2/<libc call>.2.html */
struct libc {
i32 errno = "C";
// fd buf len -> len
{ i32 i64 u32 -> u32 } write = "C";
// fd buf len -> len
{ i32 i64 u32 -> u32 } read = "C";
// status
{ i32 -> i32 } _exit = "C";
// addr len prot flags fd off -> void*
{ i64 i64 i32 i32 i32 i32 -> i64 } mmap = "C";
// mmap flags
i32 PROT_EXEC = 4;
i32 PROT_READ = 1;
i32 PROT_WRITE= 2;
i32 PROT_NONE = 0;
i32 MAP_PRIVATE = 2;
i32 MAP_ANON = 32;
};
struct ary {
val copy = { u8[] dst, int doff, u8[~] src, int soff, int len ->
for( int i=0; i<len; i++ )
dst[i+doff] = src[i+soff];
return dst;
};
};
// Ary/Vector of u8s - a resizable array of bytes.
struct aryu8 {
u32 !len = 0;
u8[] !buf;
// Grow as needed
val _grow = { int len2 ->
if( len+len2 < buf# ) return self;
int newlen = buf# * 2;
while( len+len2 >= newlen ) newlen *= 2;
u8[] buf2 = new u8[newlen];
sys.ary.copy(buf2,0,buf,0,buf#);
buf = buf2;
self;
};
// Add a character to aryu8
val add = { u8 c ->
_grow(1).buf[len++] = c;
self;
};
// Add a plain array to the aryu8
val addAry = { u8[~] ary ->
_grow(ary#);
sys.ary.copy(buf,len,ary,0,ary#);
len += ary#;
self;
};
// Remove x chars from the tail.
val undo = { int x ->
len = len >= x ? len-x : 0;
self;
};
// Print ASCII number into aryu8
val num = { i64 x ->
if( !x ) { add('0'); return self; }
if( x < 0 ) { add('-'); x = -x; }
i64 ten = 1, log = 0;
while( ten <= x ) { ten *= 10; log++; }
for( int i=0; i<log; i++ ) {
ten /= 10;
i64 q = x/ten;
u8 digit = q+'0';
add(digit);
x -= q*ten;
}
self;
};
// Write to fd, returns the number of bytes written (len).
val write = { i32 fd -> i64 ptr = buf; sys.libc.write(fd,ptr,len); };
};
// Scanner; a simple string parser.
struct Scan {
int !x;
u8[~] buf;
// Skip whitespace
val skip = { ->
while( buf[x] <= ' ' )
x++;
return self;
};
// True if find required character, and skip it; else False.
val match = { u8 c ->
skip();
if( buf[x] != c ) return false;
x++;
return true;
};
// Parse a simple number
val number = { ->
skip();
bool neg = match('-');
i64 n = 0;
while( '0' <= buf[x] & buf[x] <= '9' )
n = n*10 + (buf[x++] - '0');
return neg ? -n : n;
};
};
// Ary/Vector of i64s
struct aryi64 {
u32 !len = 0;
i64[] !buf;
// Grow as needed
val _grow = { int len2 ->
if( len+len2 < buf# ) return self;
int newlen = buf# * 2;
while( len+len2 >= newlen ) newlen *= 2;
i64[] buf2 = new i64[newlen];
for( int i=0; i<buf#; i++ )
buf2[i] = buf[i];
buf = buf2;
self;
};
// Add a i64 to aryu8
val add = { i64 c ->
_grow(1).buf[len++] = c;
self;
};
// Write to aryu8
val str = { ->
// TODO: clunky default constructor syntax
var str = new sys.aryu8 { buf = new u8[1]; }.add('[');
for( int i=0; i<len; i++ )
str.num(buf[i]).add(',').add(' ');
str.undo(2).add(']');
};
};
// Parse a comma-separated list of numbers, wrapped with square brackets,
// with optional whitespace e.g. "[ -17, 0,99,12456789 ] ".
// parseAryI64 & aryi64.str are bijections modulo whitespace.
// Returns null if the parse failed.
val parseAryI64 = { u8[~] str ->
!sys.Scan !s = new sys.Scan{ buf = str; };
if( !s.match('[') ) return null;
// Array of parsed results
var nums = new sys.aryi64{ buf=new i64[1]; };
// Parse a list of numbers
if( !s.match(']') ) { // Handle the empty list
// Parse "123, " until a something else
while( s.x < s.buf# ) {
nums.add(s.number());
if( !s.match(',') )
break;
};
if( !s.match(']') ) return null; // Close the list
}
return nums;
};
struct io {
// Print string to stdout
val p = { u8[~] str ->
i64 ptr = str; // cast array base to i64
return sys.libc.write(1,ptr,str#);
};
// Return stdin as a u8[]
val stdin = { ->
var buf = new u8[8*1024];
i64 ptr = buf;
int len = 0;
while( true ) {
int rez = sys.libc.read(0,ptr,buf#);
if( rez < 0 ) sys.libc._exit(sys.libc.errno);
len += rez;
if( rez < buf# )
break;
sys.libc._exit(-2); // Need to implement
}
// Compress
var dst = new u8[len];
return sys.ary.copy(dst,0,buf,0,len);
};
};
};
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