/*
* build an input token..
* consider only those starting with _ or A-Za-z. This is a
* combo with lookup to speed things up.
*/
static ndptr
inspect(int c, char *tp)
{
char *name = tp;
char *etp = tp+MAXTOK;
ndptr p;
unsigned int h;
h = *tp++ = c;
while ((isalnum(c = gpbc()) || c == '_') && tp < etp)
h = (h << 5) + h + (*tp++ = c);
if (c != EOF)
PUTBACK(c);
*tp = EOS;
/* token is too long, it won't match anything, but it can still
* be output. */
if (tp == ep) {
outputstr(name);
while (isalnum(c = gpbc()) || c == '_') {
if (sp < 0)
putc(c, active);
else
CHRSAVE(c);
}
*name = EOS;
return nil;
}
for (p = hashtab[h % HASHSIZE]; p != nil; p = p->nxtptr)
if (h == p->hv && STREQ(name, p->name))
break;
return p;
}
/*
* build an input token..
* consider only those starting with _ or A-Za-z.
*/
static ndptr
inspect(int c, char *tp)
{
char *name = tp;
char *etp = tp+MAXTOK;
ndptr p;
*tp++ = c;
while ((isalnum(c = gpbc()) || c == '_') && tp < etp)
*tp++ = c;
if (c != EOF)
PUSHBACK(c);
*tp = EOS;
/* token is too long, it won't match anything, but it can still
* be output. */
if (tp == ep) {
outputstr(name);
while (isalnum(c = gpbc()) || c == '_') {
if (sp < 0)
reallyputchar(c);
else
CHRSAVE(c);
}
*name = EOS;
return NULL;
}
p = ohash_find(¯os, ohash_qlookupi(¯os, name, (const char **)&tp));
if (p == NULL)
return NULL;
if (macro_getdef(p) == NULL)
return NULL;
return p;
}
/*
* output string directly, without pushing it for reparses.
*/
void
outputstr(const char *s)
{
if (sp < 0)
reallyoutputstr(s);
else
while (*s)
CHRSAVE(*s++);
}
/*
* output string directly, without pushing it for reparses.
*/
void
outputstr(const char *s)
{
if (sp < 0)
while (*s)
putc(*s++, active);
else
while (*s)
CHRSAVE(*s++);
}
/*
* macro - the work horse..
*/
static void
macro(void)
{
char token[MAXTOK+1];
int t, l;
ndptr p;
int nlpar;
cycle {
t = gpbc();
if (t == '_' || isalpha(t)) {
p = inspect(t, token);
if (p != nil)
putback(l = gpbc());
if (p == nil || (l != LPAREN &&
(p->type & NEEDARGS) != 0))
outputstr(token);
else {
/*
* real thing.. First build a call frame:
*/
pushf(fp); /* previous call frm */
pushf(p->type); /* type of the call */
pushf(0); /* parenthesis level */
fp = sp; /* new frame pointer */
/*
* now push the string arguments:
*/
pushs1(p->defn); /* defn string */
pushs1(p->name); /* macro name */
pushs(ep); /* start next..*/
if (l != LPAREN && PARLEV == 0) {
/* no bracks */
chrsave(EOS);
if ((uintptr_t)sp == STACKMAX)
errx(1, "internal stack overflow");
eval((const char **) mstack+fp+1, 2,
CALTYP);
ep = PREVEP; /* flush strspace */
sp = PREVSP; /* previous sp.. */
fp = PREVFP; /* rewind stack...*/
}
}
} else if (t == EOF) {
if (sp > -1) {
warnx( "unexpected end of input, unclosed parenthesis:");
dump_stack(paren, PARLEV);
exit(1);
}
if (ilevel <= 0)
break; /* all done thanks.. */
release_input(infile+ilevel--);
free(inname[ilevel+1]);
bufbase = bbase[ilevel];
emitline();
continue;
}
/*
* non-alpha token possibly seen..
* [the order of else if .. stmts is important.]
*/
else if (LOOK_AHEAD(t,lquote)) { /* strip quotes */
nlpar = 0;
record(quotes, nlpar++);
/*
* Opening quote: scan forward until matching
* closing quote has been found.
*/
do {
l = gpbc();
if (LOOK_AHEAD(l,rquote)) {
if (--nlpar > 0)
outputstr(rquote);
} else if (LOOK_AHEAD(l,lquote)) {
record(quotes, nlpar++);
outputstr(lquote);
} else if (l == EOF) {
if (nlpar == 1)
warnx("unclosed quote:");
else
warnx("%d unclosed quotes:", nlpar);
dump_stack(quotes, nlpar);
exit(1);
} else {
if (nlpar > 0) {
if (sp < 0)
putc(l, active);
else
CHRSAVE(l);
}
}
}
while (nlpar != 0);
}
else if (sp < 0 && LOOK_AHEAD(t, scommt)) {
fputs(scommt, active);
for(;;) {
t = gpbc();
if (LOOK_AHEAD(t, ecommt)) {
fputs(ecommt, active);
break;
}
if (t == EOF)
break;
putc(t, active);
}
}
else if (sp < 0) { /* not in a macro at all */
putc(t, active); /* output directly.. */
}
else switch(t) {
case LPAREN:
if (PARLEV > 0)
chrsave(t);
while (isspace(l = gpbc()))
; /* skip blank, tab, nl.. */
putback(l);
record(paren, PARLEV++);
break;
case RPAREN:
if (--PARLEV > 0)
chrsave(t);
else { /* end of argument list */
chrsave(EOS);
if ((uintptr_t)sp == STACKMAX)
errx(1, "internal stack overflow");
eval((const char **) mstack+fp+1, sp-fp,
CALTYP);
ep = PREVEP; /* flush strspace */
sp = PREVSP; /* previous sp.. */
fp = PREVFP; /* rewind stack...*/
}
break;
case COMMA:
if (PARLEV == 1) {
chrsave(EOS); /* new argument */
while (isspace(l = gpbc()))
;
putback(l);
pushs(ep);
} else
chrsave(t);
break;
default:
if (LOOK_AHEAD(t, scommt)) {
char *pc;
for (pc = scommt; *pc; pc++)
chrsave(*pc);
for(;;) {
t = gpbc();
if (LOOK_AHEAD(t, ecommt)) {
for (pc = ecommt; *pc; pc++)
chrsave(*pc);
break;
}
if (t == EOF)
break;
CHRSAVE(t);
}
} else
CHRSAVE(t); /* stack the char */
break;
}
}
}
/*
* macro - the work horse..
*/
static void
macro(void)
{
char token[MAXTOK+1];
int t, l;
ndptr p;
int nlpar;
cycle {
t = gpbc();
if (LOOK_AHEAD(t,lquote)) { /* strip quotes */
nlpar = 0;
record(quotes, nlpar++);
/*
* Opening quote: scan forward until matching
* closing quote has been found.
*/
do {
l = gpbc();
if (LOOK_AHEAD(l,rquote)) {
if (--nlpar > 0)
outputstr(rquote);
} else if (LOOK_AHEAD(l,lquote)) {
record(quotes, nlpar++);
outputstr(lquote);
} else if (l == EOF) {
if (nlpar == 1)
warnx("unclosed quote:");
else
warnx("%d unclosed quotes:", nlpar);
dump_stack(quotes, nlpar);
exit(1);
} else {
if (nlpar > 0) {
if (sp < 0)
reallyputchar(l);
else
CHRSAVE(l);
}
}
}
while (nlpar != 0);
} else if (sp < 0 && LOOK_AHEAD(t, scommt)) {
reallyoutputstr(scommt);
for(;;) {
t = gpbc();
if (LOOK_AHEAD(t, ecommt)) {
reallyoutputstr(ecommt);
break;
}
if (t == EOF)
break;
reallyputchar(t);
}
} else if (t == '_' || isalpha(t)) {
p = inspect(t, token);
if (p != NULL)
pushback(l = gpbc());
if (p == NULL || (l != LPAREN &&
(macro_getdef(p)->type & NEEDARGS) != 0))
outputstr(token);
else {
/*
* real thing.. First build a call frame:
*/
pushf(fp); /* previous call frm */
pushf(macro_getdef(p)->type); /* type of the call */
pushf(is_traced(p));
pushf(0); /* parenthesis level */
fp = sp; /* new frame pointer */
/*
* now push the string arguments:
*/
pushs1(macro_getdef(p)->defn); /* defn string */
pushs1((char *)macro_name(p)); /* macro name */
pushs(ep); /* start next..*/
if (l != LPAREN && PARLEV == 0) {
/* no bracks */
chrsave(EOS);
if (sp == (int)STACKMAX)
errx(1, "internal stack overflow");
eval((const char **) mstack+fp+1, 2,
CALTYP, TRACESTATUS);
ep = PREVEP; /* flush strspace */
sp = PREVSP; /* previous sp.. */
fp = PREVFP; /* rewind stack...*/
}
}
} else if (t == EOF) {
if (!mimic_gnu /* you can puke right there */
&& sp > -1 && ilevel <= 0) {
warnx( "unexpected end of input, unclosed parenthesis:");
dump_stack(paren, PARLEV);
exit(1);
}
if (ilevel <= 0)
break; /* all done thanks.. */
release_input(infile+ilevel--);
emit_synchline();
bufbase = bbase[ilevel];
continue;
} else if (sp < 0) { /* not in a macro at all */
reallyputchar(t); /* output directly.. */
}
else switch(t) {
case LPAREN:
if (PARLEV > 0)
chrsave(t);
while (isspace(l = gpbc())) /* skip blank, tab, nl.. */
if (PARLEV > 0)
chrsave(l);
pushback(l);
record(paren, PARLEV++);
break;
case RPAREN:
if (--PARLEV > 0)
chrsave(t);
else { /* end of argument list */
chrsave(EOS);
if (sp == (int)STACKMAX)
errx(1, "internal stack overflow");
eval((const char **) mstack+fp+1, sp-fp,
CALTYP, TRACESTATUS);
ep = PREVEP; /* flush strspace */
sp = PREVSP; /* previous sp.. */
fp = PREVFP; /* rewind stack...*/
}
break;
case COMMA:
if (PARLEV == 1) {
chrsave(EOS); /* new argument */
while (isspace(l = gpbc()))
;
pushback(l);
pushs(ep);
} else
chrsave(t);
break;
default:
if (LOOK_AHEAD(t, scommt)) {
char *cp;
for (cp = scommt; *cp; cp++)
chrsave(*cp);
for(;;) {
t = gpbc();
if (LOOK_AHEAD(t, ecommt)) {
for (cp = ecommt; *cp; cp++)
chrsave(*cp);
break;
}
if (t == EOF)
break;
CHRSAVE(t);
}
} else
CHRSAVE(t); /* stack the char */
break;
}
}
}
