pnx/m16vm
1
0
Fork 0
mirror of https://github.com/pnx/m16vm synced 2026-06-16 03:44:55 +02:00
Code Releases Activity

src/as/lexer.c: implement hexadecimal numbers.

Browse source
This commit is contained in:
Henrik Hautakoski 2018-12-14 00:35:09 +01:00
parent 1a29b39663
commit de29a981bd
No known key found for this signature in database
GPG key ID: 839F3A7EAFAEAFAA
1 changed files with 51 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

56
src/as/lexer.c
View file

@ -70,14 +70,34 @@ static int read_next(struct lexer *lex) {
return c;
}
static int read_number(FILE *fp) {
static int read_hex(FILE *fp) {
int c, val = 0;
int c, neg = 0, val = 0;
while((c = fgetc(fp)) != EOF) {
if (neg == 0 && c == '-') {
neg = 1;
continue;
char n = 0;
if (number(c)) {
n = c - '0';
}
else if ( (c >= 'a' && c <= 'f')
|| (c >= 'A' && c <= 'F')) {
n = (c % 0x20) + 9;
}
else {
ungetc(c, fp);
break;
}
val = (val * 16) + n;
}
return val;
}
static int read_dec(FILE *fp, int neg) {
int c, val = 0;
while((c = fgetc(fp)) != EOF) {
if (!number(c)) {
ungetc(c, fp);
break;
@ -90,6 +110,32 @@ static int read_number(FILE *fp) {
return val;
}
static int read_number(FILE *fp) {
int neg = 0, c = fgetc(fp);
// Check for '0x'.
if (c == '0') {
c = fgetc(fp);
if (c == 'x') {
// We have a hexadecimal number.
return read_hex(fp);
}
ungetc(c, fp);
ungetc('0', fp);
}
// While we are at it. check for a negative sign.
else if (c == '-') {
neg = 1;
}
// We got something else. put it back.
else {
ungetc(c, fp);
}
return read_dec(fp, neg);
}
static int read_string(FILE *fp, char *buf, size_t len) {
int c, label_decl = 0, i = 0;