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Add predefined macros

C standard defines some predefined macros that are always
present in any implementation of the language. This version
of the compiler support:
	- __STDC__
	- __DATE__
	- __TIME__
	- __STDC_HOSTED__
	- __STDC_VERSION__
	- __LINE__
	- __FILE__

At this moment __STDC__ is 1, even when we are not 100%
compatible with the standard (and we don't want to be),
but in the majority of cases the small differencies are
not signigficatives, so it is more or less safe to
declare it. In the same way, __STDC_VERSION__ is set
to 199409L, that is the value for C90 with 94
ammendents.

--- a/cc1/cc1.h

+++ b/cc1/cc1.h

@@ -256,6 +256,7 @@

 extern Symbol *install(unsigned ns);

 extern Symbol *newsym(unsigned ns);

 extern void pushctx(void), popctx(void);

+extern void ikeywords(void);

 /* stmt.c */

 extern void compound(Symbol *lbreak, Symbol *lcont, Caselist *lswitch);

@@ -277,6 +278,7 @@

 extern char *addinput(char *fname, Symbol *sym);

 extern void setnamespace(int ns);

 extern void setsafe(int type);

+extern void initcpp(void);

 #define accept(t) ((yytoken == (t)) ? next() : 0)

 /* code.c */

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -5,6 +5,7 @@

 #include <stdio.h>

 #include <stdlib.h>

 #include <string.h>

+#include <time.h>

 #include "../inc/sizes.h"

 #include "../inc/cc.h"

@@ -16,9 +17,42 @@

 static unsigned arglen;

 static unsigned numif;

 static Symbol *lastmacro;

+static Symbol *symline, *symfile;

 unsigned char ifstatus[NR_COND];

+static Symbol *

+defmacro(char *s)

+{

+	Symbol *sym;

+

+	strcpy(yytext, s);

+	sym = lookup(NS_CPP);

+	sym->flags |= ISDEFINED;

+	return sym;

+}

+

+void

+initcpp(void)

+{

+	static char sdate[17], stime[14];

+	struct tm *tm;

+	time_t t;

+

+	t = time(NULL);

+	tm = localtime(&t);

+	strftime(sdate, sizeof(sdate), "-1#\"%b %d %Y\"", tm);

+	strftime(stime, sizeof(stime), "-1#\"%H:%M:%S\"", tm);

+

+	defmacro("__STDC__")->u.s = "-1#1";

+	defmacro("__DATE__")->u.s = sdate;

+	defmacro("__TIME__")->u.s = stime;

+	defmacro("__STDC_HOSTED__")->u.s = "-1#1";

+	defmacro("__STDC_VERSION__")->u.s = "-1#199409L";

+	symline = defmacro("__LINE__");

+	symfile = defmacro("__FILE__");

+}

+

 static bool

 iden(char **str)

 {

@@ -159,13 +193,25 @@

  * is the macro definition, where @dd@ indicates the

  * parameter number dd

  */

+#define BUFSIZE ((INPUTSIZ > FILENAME_MAX+5) ? INPUTSIZ : FILENAME_MAX+5)

 bool

 expand(Symbol *sym)

 {

 	unsigned len;

-	char *arglist[NR_MACROARG], buffer[INPUTSIZ];

+	char *arglist[NR_MACROARG], buffer[BUFSIZE];

 	char c, *bp, *arg, *s = sym->u.s;

+	if (sym == symfile) {

+		sprintf(buffer, "-1#\"%s\"", getfname());

+		strcpy(addinput(NULL, symfile), buffer);

+		return 0;

+	}

+	if (sym == symline) {

+		sprintf(buffer, "-1#%d", getfline());

+		strcpy(addinput(NULL, symline), buffer);

+		return 0;

+	}

+

 	lastmacro = sym;

 	if (!parsepars(buffer, arglist, atoi(s)))

 		return 0;

@@ -196,6 +242,7 @@

 expansion_too_long:

 	error("expansion of macro \"%s\" is too long", lastmacro->name);

 }

+#undef BUFSIZE

 /*

  * Parse an argument list (par0, par1, ...) and creates

--- a/cc1/main.c

+++ b/cc1/main.c

@@ -9,8 +9,6 @@

 #include "../inc/cc.h"

 #include "cc1.h"

-extern void ikeywords(void), lexfile(char *file);

-

 int warnings;

 jmp_buf recover;

@@ -65,6 +63,7 @@

 	if (argc > 1)

 		usage();

+	initcpp();

 	ikeywords();

 	if (!addinput(*argv, NULL))