shithub: scc

Download patch

ref: f5199492fb98c0b6c2034041e6865de4dabaac33
parent: 1ae4a875f9b9215126fd406329cbfd267271492d
author: Roberto E. Vargas Caballero <[email protected]>
date: Sat May 9 13:21:56 EDT 2015 

Add cpp.c file

The preprocessor and the lexer are different things, so it is better to separate
them


--- a/cc1/Makefile
+++ b/cc1/Makefile
@@ -1,6 +1,6 @@
 
 OBJS = types.o decl.o lex.o error.o symbol.o main.o expr.o \
-	code.o stmt.o
+	code.o stmt.o cpp.o
 
 LIBS = -lcc
 
--- a/cc1/cc1.h
+++ b/cc1/cc1.h
@@ -278,6 +278,9 @@
 /* expr.c */
 extern Node *expr(void), *negate(Node *np);
 
+/* cpp.c */
+extern char *preprocessor(char *s);
+
 /*
  * Definition of global variables
  */
--- /dev/null
+++ b/cc1/cpp.c
@@ -1,0 +1,88 @@
+
+#include <ctype.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "../inc/cc.h"
+#include "cc1.h"
+
+/* TODO: preprocessor error must not rise recover */
+char *
+include(char *s)
+{
+	char fname[FILENAME_MAX], delim, c, *p;
+	size_t len;
+
+	if ((c = *s++) == '>')
+		delim = '>';
+	else if (c == '"')
+		delim = '"';
+	else
+		goto bad_include;
+
+	for (p = s; (c = *p) && c != delim; ++p)
+		/* nothing */;
+	if (c == '\0')
+		goto bad_include;
+
+	len = p - s;
+	if (delim == '"') {
+		if (len >= FILENAME_MAX)
+			goto too_long;
+		strncpy(fname, s, len);
+		fname[len] = '\0';
+		if (!addinput(fname))
+			goto not_found;
+	} else {
+		abort();
+	}
+
+	return p+1;
+
+not_found:
+	error("included file '%s' not found", fname);
+too_long:
+	error("file name in include too long");
+bad_include:
+	error("#include expects \"FILENAME\" or <FILENAME>");
+}
+
+char *
+preprocessor(char *p)
+{
+	char *q;
+	unsigned short n;
+	static char **bp, *cmds[] = {
+		"include",
+		NULL
+	};
+	static char *(*funs[])(char *) = {
+		include
+	};
+
+	while (isspace(*p))
+		++p;
+	if (*p != '#')
+		return p;
+	for (++p; isspace(*p); ++p)
+		/* nothing */;
+	for (q = p; isalpha(*q); ++q)
+		/* nothing */;
+	n = q - p;
+	while (isspace(*q))
+		++q;
+	for (bp = cmds; *bp; ++bp) {
+		if (strncmp(*bp, p, n))
+			continue;
+		q = (*funs[bp - cmds])(q);
+		while (isspace(*q++))
+			/* nothing */;
+		if (*q != '\0')
+			error("trailing characters after preprocessor directive");
+		return NULL;
+	}
+	error("incorrect preprocessor directive");
+}
+
--- a/cc1/lex.c
+++ b/cc1/lex.c
@@ -91,84 +91,6 @@
 	return input->nline;
 }
 
-/* TODO: preprocessor error must not rise recover */
-char *
-include(char *s)
-{
-	char fname[FILENAME_MAX], delim, c, *p;
-	size_t len;
-
-	if ((c = *s++) == '>')
-		delim = '>';
-	else if (c == '"')
-		delim = '"';
-	else
-		goto bad_include;
-
-	for (p = s; (c = *p) && c != delim; ++p)
-		/* nothing */;
-	if (c == '\0')
-		goto bad_include;
-
-	len = p - s;
-	if (delim == '"') {
-		if (len >= FILENAME_MAX)
-			goto too_long;
-		strncpy(fname, s, len);
-		fname[len] = '\0';
-		if (!addinput(fname))
-			goto not_found;
-	} else {
-		abort();
-	}
-
-	return p+1;
-
-not_found:
-	error("included file '%s' not found", fname);
-too_long:
-	error("file name in include too long");
-bad_include:
-	error("#include expects \"FILENAME\" or <FILENAME>");
-}
-
-static char *
-preprocessor(char *p)
-{
-	char str[IDENTSIZ+1], *q;
-	unsigned short n;
-	static char **bp, *cmds[] = {
-		"include",
-		NULL
-	};
-	static char *(*funs[])(char *) = {
-		include
-	};
-
-	while (isspace(*p))
-		++p;
-	if (*p != '#')
-		return p;
-	for (++p; isspace(*p); ++p)
-		/* nothing */;
-	for (q = p; isalpha(*q); ++q)
-		/* nothing */;
-	n = q - p;
-	while (isspace(*q))
-		++q;
-	for (bp = cmds; *bp; ++bp) {
-		if (strncmp(*bp, p, n))
-			continue;
-		q = (*funs[bp - cmds])(q);
-		while (isspace(*q++))
-			/* nothing */;
-		if (*q != '\0')
-			error("trailing characters after preprocessor directive");
-		return NULL;
-	}
-	error("incorrect preprocessor directive");
-}
-
 static int
 readchar(void)
 {