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cc1: Allocate macro input before copying definition

This change makes possible to trace a parameter expansion
because if you run over the list of stacked inputs we can
find an IMACRO input from any IPARAM input.

--- a/src/cmd/cc/cc1/cpp.c

+++ b/src/cmd/cc/cc1/cpp.c

@@ -211,6 +211,11 @@

 	char *s, *p, *arg, *bp;

 	int size, bufsiz;

+	if (mp->sym == symfile)

+		return sprintf(mp->buffer, "\"%s\" ", filenam);

+	if (mp->sym == symline)

+		return sprintf(mp->buffer, "%d ", lineno);

+

 	bp = mp->buffer;

 	bufsiz = mp->bufsiz;

 	for (s = mp->def; c = *s; ++s) {

@@ -322,6 +327,7 @@

 	mp->arglist = NULL;

 	mp->def = sym->u.s + 3;

 	mp->npars = 0;

+	mp->buffer = NULL;

 	if (sym->u.s)

 		mp->npars = atoi(sym->u.s);

@@ -333,7 +339,6 @@

 {

 	int elen;

 	Macro *mp;

-	char buffer[INPUTSIZ];

 	DBG("MACRO '%s' detected disexpand=%d hide=%d",

 	    sym->name, disexpand, sym->hide);

@@ -343,28 +348,20 @@

 	mp = newmacro(sym);

 	mp->fname = filenam;

-	mp->buffer = buffer;

-	mp->bufsiz = INPUTSIZ-1;

-	if (sym == symfile) {

-		elen = sprintf(buffer, "\"%s\" ", filenam);

-		goto substitute;

-	}

-	if (sym == symline) {

-		elen = sprintf(buffer, "%d ", lineno);

-		goto substitute;

-	}

-

 	if (!parsepars(mp)) {

 		delmacro(mp);

 		return 0;

 	}

-	elen = copymacro(mp);

-substitute:

-	buffer[elen] = '\0';

-	DBG("MACRO '%s' expanded to :'%s'", mp->sym->name, buffer);

 	addinput(IMACRO, mp, FAIL);

+	mp->buffer = input->line;

+	mp->bufsiz = INPUTSIZ-1;

+

+	elen = copymacro(mp);

+	mp->buffer[elen] = '\0';

+

+	DBG("MACRO '%s' expanded to :'%s'", mp->sym->name, mp->buffer);

 	return 1;

 }

--- a/src/cmd/cc/cc1/lex.c

+++ b/src/cmd/cc/cc1/lex.c

@@ -85,7 +85,7 @@

 		fname = mp->fname;

 		buffer = mp->buffer;

 		hide(sym);

-		DBG("INPUT: macro %s expanded to '%s'", sym->name, buffer);

+		DBG("INPUT: expanding macro %s", sym->name);

 		break;

 	case IPARAM:

 		fp = NULL;