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[cc1] Improve error handling in string()

--- a/cc1/lex.c

+++ b/cc1/lex.c

@@ -515,12 +515,16 @@

 	*bp++ = '"';

 repeat:

 	for (++input->p; (c = *input->p) != '"'; ++input->p) {

-		if (c == '\0')

-			error("missing terminating '\"' character");

+		if (c == '\0') {

+			errorp("missing terminating '\"' character");

+			break;

+		}

 		if (c == '\\')

 			c = escape();

-		if (bp == &yytext[STRINGSIZ+1])

+		if (bp == &yytext[STRINGSIZ+1]) {

+			/* TODO: proper error handling here */

 			error("string too long");

+		}

 		*bp++ = c;

 	}