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(uxnasm) Abstracted tokenizer

This commit is contained in:
Devine Lu Linvega 2024-03-26 10:45:25 -07:00
parent e632579243
commit 553e559e4e
1 changed files with 27 additions and 22 deletions
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49
src/uxnasm.c
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@ -218,11 +218,10 @@ makepad(char *w)
int rel = w[0] == '$' ? p.ptr : 0;
if(sihx(w + 1))
p.ptr = shex(w + 1) + rel;
else {
if(!(l = findlabel(w + 1)))
return error_asm("Invalid label");
else if((l = findlabel(w + 1)))
p.ptr = l->addr + rel;
}
else
return error_asm("Invalid padding");
return 1;
}
@ -274,6 +273,29 @@ writeshort(Uint16 s, int lit)
return (lit ? writebyte(findopcode("LIT2")) : 1) && writebyte(s >> 8) && writebyte(s & 0xff);
}
static int
tokenize(FILE *f)
{
unsigned int buf;
char *cptr = token;
while(fread(&buf, 1, 1, f)) {
char c = (char)buf;
if(c < 0x21) {
*cptr++ = 0x00;
if(c == 0x0a)
p.line++;
if(token[0])
if(!parse(token, f))
return 0;
cptr = token;
} else if(cptr - token < 0x3f)
*cptr++ = c;
else
return error_asm("Token too long");
}
return 1;
}
static int
doinclude(char *filename)
{
@ -443,26 +465,9 @@ resolve(void)
static int
assemble(FILE *f)
{
unsigned int buf;
char *cptr = token;
p.ptr = 0x100;
scpy("on-reset", p.scope, 0x40);
while(fread(&buf, 1, 1, f)) {
char c = (char)buf;
if(c < 0x21) {
*cptr++ = 0x00;
if(c == 0x0a)
p.line++;
if(token[0])
if(!parse(token, f))
return 0;
cptr = token;
} else if(cptr - token < 0x3f)
*cptr++ = c;
else
return error_asm("Token too long");
}
return resolve();
return tokenize(f) && resolve();
}
static void