shithub: scc

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Add initial version of #define

This version only accetps define without parameters and it
doesn't expand it.

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -5,11 +5,42 @@

 #include <stdlib.h>

 #include <string.h>

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

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

 #include "cc1.h"

 /* TODO: preprocessor error must not rise recover */

 static char *

+define(char *s)

+{

+	char *t, name[IDENTSIZ+1];

+	size_t len;

+	Symbol *sym;

+

+	if (!isalnum(*s) && *s != '_')

+		goto bad_define;

+	for (t = s; isalnum(*t) || *t == '_'; ++t)

+		/* nothing */;

+	if ((len = t - s) > IDENTSIZ)

+		goto too_long;

+	strncpy(name, s, len);

+	name[len] = '\0';

+	sym = install(name, NS_CPP);

+

+	while (isspace(*t))

+		++t;

+	for (s = t + strlen(t); isspace(*--s); *s = '\0')

+		/* nothing */;

+	sym->u.s = xstrdup(t);

+	return s+1;

+

+too_long:

+	error("macro identifier too long");

+bad_define:

+	error("macro names must be identifiers");

+}

+

+static char *

 include(char *s)

 {

 	char fname[FILENAME_MAX], delim, c, *p;

@@ -103,6 +134,7 @@

 	char *q;

 	unsigned short n;

 	static char **bp, *cmds[] = {

+		"define",

 		"include",

 		"line",

 		"pragma",

@@ -110,6 +142,7 @@

 		NULL

 	};

 	static char *(*funs[])(char *) = {

+		define,

 		include,

 		line,

 		pragma,