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Atari Mega Archive 1
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Atari Mega Archive - Volume 1.iso
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iconv8_s.arc
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ICONT.ARC
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LLEX.C
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C/C++ Source or Header
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1990-03-28
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8KB
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359 lines
/*
* llex.c -- lexical analysis routines.
*/
#ifdef CRAY
#include <stdlib.h>
#endif /* CRAY */
#include <math.h>
#include "..\h\config.h"
#include "general.h"
#include "tproto.h"
#include "link.h"
#include "opcode.h"
#include <ctype.h>
int nlflag = 0; /* newline last seen */
#if MACINTOSH
#if MPW
#include <CursorCtl.h>
#define CURSORINTERVAL 100
#endif /* MPW */
#endif /* MACINTOSH */
#if !EBCDIC
#define tonum(c) (isdigit(c) ? (c - '0') : ((c & 037) + 9))
#endif /* !EBCDIC */
#if !EBCDIC
/*
* getopc - get an opcode from infile, return the opcode number (via
* binary search of opcode table), and point id at the name of the opcode.
*/
int getopc(id)
char **id;
{
register char *s;
register struct opentry *p;
register int test;
int low, high, cmp;
extern char *getstr();
s = getstr();
if (s == NULL)
return EOF;
low = 0;
high = NOPCODES;
do {
test = (low + high) / 2;
p = &optable[test];
if ((cmp = strcmp(p->op_name, s)) < 0)
low = test + 1;
else if (cmp > 0)
high = test;
else {
*id = p->op_name;
return (p->op_code);
}
} while (low < high);
*id = s;
return 0;
}
#else /* !EBCDIC */
/*
* getopc - get an opcode from infile, return the opcode number (via
* sequential search of opcode table) and point id at the name of the opcode.
*/
int getopc(id)
char **id;
{
register char *s;
register struct opentry *p;
register int test;
s = getstr();
if (s == NULL)
return EOF;
for(test=0;test < NOPCODES; test++) {
p = &optable[test];
if( strcmp(p->op_name, s) == 0) {
*id = p->op_name;
return (p->op_code);
}
}
*id = s;
return 0;
}
#endif /* !EBCDIC */
/*
* getid - get an identifier from infile, put it in the identifier
* table, and return a pointer to it.
*/
char *getid()
{
register char *s;
s = getstr();
if (s == NULL)
return NULL;
return putident((int)strlen(s)+1);
}
/*
* getstr - get an identifier from infile and return a pointer to it.
*/
char *getstr()
{
register int c;
register char *p;
#if MACINTOSH
#if MPW
{
static short cursorcount = CURSORINTERVAL;
if (--cursorcount == 0) {
RotateCursor(-32);
cursorcount = CURSORINTERVAL;
}
}
#endif /* MPW */
#endif /* MACINTOSH */
p = lsfree;
while ((c = getc(infile)) == ' ' || c == '\t') ;
if (c == EOF)
return NULL;
while (c != ' ' && c != '\t' && c != '\n' && c != ',' && c != EOF) {
if (p >= lsend)
quit("out of string space");
*p++ = c;
c = getc(infile);
}
*p = 0;
nlflag = (c == '\n');
return lsfree;
}
/*
* getrest - get the rest of the line from infile, put it in the identifier
* table, and return a pointer to it.
*/
char *getrest()
{
register int c;
register char *p;
p = lsfree;
while ((c = getc(infile)) != '\n' && c != EOF) {
if (p >= lsend)
quit("out of string space");
*p++ = c;
}
*p = 0;
nlflag = (c == '\n');
return putident((int)strlen(lsfree)+1);
}
/*
* getdec - get a decimal integer from infile, and return it.
*/
int getdec()
{
register int c, n;
int sign = 1;
n = 0;
while ((c = getc(infile)) == ' ' || c == '\t') ;
if (c == EOF)
return 0;
if (c == '-') {
sign = -1;
c = getc(infile);
}
while (c >= '0' && c <= '9') {
n = n * 10 + (c - '0');
c = getc(infile);
}
nlflag = (c == '\n');
return n*sign;
}
/*
* getoct - get an octal number from infile, and return it.
*/
int getoct()
{
register int c, n;
n = 0;
while ((c = getc(infile)) == ' ' || c == '\t') ;
if (c == EOF)
return 0;
while (c >= '0' && c <= '7') {
n = (n << 3) | (c - '0');
c = getc(infile);
}
nlflag = (c == '\n');
return n;
}
/*
* Get integer, but if it's too large for a long, put the string via cp
* and return -1.
*/
long getint(j,cp)
int j;
char **cp;
{
register int c;
int over = 0;
register char *p;
double result = 0;
long lresult = 0;
double radix;
if (lsfree + j > lsend)
quit("out of string space");
p = lsfree;
while ((c = getc(infile)) >= '0' && c <= '9') {
*p++ = c;
result = result * 10 + (c - '0');
lresult = lresult * 10 + (c - '0');
if (result <= MinLong || result >= MaxLong) {
over = 1; /* flag overflow */
result = 0; /* reset to avoid fp exception */
}
}
if (c == 'r' || c == 'R') {
*p++ = c;
radix = result;
lresult = 0;
result = 0;
while (c = getc(infile)) {
*p++ = c;
if (isdigit(c) || isalpha(c))
c = tonum(c);
else
break;
result = result * radix + c;
lresult = lresult * radix + c;
if (result <= MinLong || result >= MaxLong) {
over = 1; /* flag overflow */
result = 0; /* reset to avoid fp exception */
}
}
}
nlflag = (c == '\n');
if (!over)
return lresult; /* integer is small enough */
else { /* integer is too large */
*p++ = 0;
*cp = putident((int)(p - lsfree));/* convert integer to string */
return -1; /* indicate integer is too big */
}
}
/*
* getreal - get an Icon real number from infile, and return it.
*/
double getreal()
{
double n;
register int c, d, e;
int esign;
register char *s, *ep;
char cbuf[128];
s = cbuf;
d = 0;
while ((c = getc(infile)) == '0')
;
while (c >= '0' && c <= '9') {
*s++ = c;
d++;
c = getc(infile);
}
if (c == '.') {
if (s == cbuf)
*s++ = '0';
*s++ = c;
while ((c = getc(infile)) >= '0' && c <= '9')
*s++ = c;
}
ep = s;
if (c == 'e' || c == 'E') {
*s++ = c;
if ((c = getc(infile)) == '+' || c == '-') {
esign = (c == '-');
*s++ = c;
c = getc(infile);
}
e = 0;
while (c >= '0' && c <= '9') {
e = e * 10 + c - '0';
*s++ = c;
c = getc(infile);
}
if (esign) e = -e;
e += d - 1;
if (abs(e) >= LogHuge)
*ep = '\0';
}
*s = '\0';
n = atof(cbuf);
nlflag = (c == '\n');
return n;
}
/*
* getlab - get a label ("L" followed by a number) from infile,
* and return the number.
*/
int getlab()
{
register int c;
while ((c = getc(infile)) != 'L' && c != EOF && c != '\n') ;
if (c == 'L')
return getdec();
nlflag = (c == '\n');
return 0;
}
/*
* getstrlit - get a string literal from infile, as a string
* of octal bytes, and return it.
*/
char *getstrlit(l)
register int l;
{
register char *p;
if (lsfree + l > lsend)
quit("out of string space");
p = lsfree;
while (!nlflag && l--)
*p++ = getoct();
*p++ = 0;
return putident((int)(p-lsfree));
}
/*
* newline - skip to next line.
*/
novalue newline()
{
register int c;
if (!nlflag) {
while ((c = getc(infile)) != '\n' && c != EOF) ;
}
nlflag = 0;
}