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cc1: Don't accept comments in strings

Strings can store characters that represent comments and it means
that the presence of string and character constants must be checked
at the very beginning of the text processing in the code.

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

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

@@ -200,7 +200,7 @@

 readline(void)

 {

 	char *bp, *lim;

-	int c, peekc = 0;

+	int c, peekc = 0, delim = 0;

 	if (feof(input->fp)) {

 		input->flags |= IEOF;

@@ -214,7 +214,23 @@

 		peekc = 0;

 		if (c == '\n' || c == EOF)

 			break;

-		if (c != '/')

+		if (c == '\\') {

+			peekc = readchar();

+			if (peekc == '\n' || peekc == EOF)

+				continue;

+			if (bp == lim-2)

+				break;

+			*bp++ = c;

+			c = peekc;

+			peekc = 0;

+			continue;

+		}

+

+		if (delim && c == delim)

+			delim = 0;

+		else if (!delim && (c == '"' || c == '\''))

+			delim = c;

+		if (c != '/' || delim)

 			continue;

 		/* check for /* or // */

--- /dev/null

+++ b/tests/cc/execute/0203-comment.c

@@ -1,0 +1,7 @@

+int

+main(void)

+{

+	if (sizeof("//") != 3)

+		return 1;

+	return 0;

+}

--- a/tests/cc/execute/scc-tests.lst

+++ b/tests/cc/execute/scc-tests.lst

@@ -193,3 +193,4 @@

 0200-cpp.c [TODO]

 0201-cpp.c [TODO]

 0202-variadic.c [TODO]

+0203-comment.c