cgen: escape quotes & nl in string literals

vlib/compiler/aparser.v

@@ -24,7 +24,7 @@ struct Parser {
 	pref                   &pref.Preferences
 mut:
 	scanner                &Scanner
-// Preferences shared from V struct
+	// Preferences shared from V struct
 	tokens                 []Token
 	token_idx              int
 	prev_stuck_token_idx   int
@@ -180,7 +180,7 @@ fn (v mut V) new_parser_from_file(path string) Parser {
 	p = {
 		p |
 		file_path:path,
-		file_path_dir: path_dir,
+		file_path_dir:path_dir,
 		file_name:path.all_after(os.path_separator),
 		file_platform:path_platform,
 		file_pcguard:path_pcguard,
@@ -720,7 +720,7 @@ fn (p mut Parser) const_decl() {
 			// }
 			continue
 		}
-    var_token_idx := p.cur_tok_index()
+		var_token_idx := p.cur_tok_index()
 		mut name := p.check_name() // `Age = 20`
 		// if !p.pref.building_v && p.mod != 'os' && contains_capital(name) {
 		// p.warn('const names cannot contain uppercase letters, use snake_case instead')
@@ -872,11 +872,7 @@ fn (p mut Parser) type_decl() {
 				}
 				p.cgen.consts << '#define SumType_${name}_$child_type_name $idx // DEF2'
 				ctype_names << child_type_name
-				sum_variants << if p.mod in ['builtin', 'main'] || child_type_name in builtin_types {
-					child_type_name
-				} else {
-					p.prepend_mod(child_type_name)
-				}
+				sum_variants << if p.mod in ['builtin', 'main'] || child_type_name in builtin_types { child_type_name } else { p.prepend_mod(child_type_name) }
 			}
 			if done {
 				break
@@ -2598,10 +2594,9 @@ fn (p mut Parser) char_expr() {
 
 fn format_str(_str string) string {
 	// TODO don't call replace 3 times for every string, do this in scanner.v
-	mut str := _str.replace('"', '\\"')
-	str = str.replace('\r\n', '\\n')
-	str = str.replace('\n', '\\n')
-	return str
+	return _str.replace_each(['"', '\\"',
+	'\n', '\\n',
+	'\r\n', '\\n'])
 }
 
 // m := map[string]int{}

vlib/v/gen/cgen.v

@@ -809,11 +809,14 @@ fn (g mut Gen) expr(node ast.Expr) {
 		ast.StringLiteral {
 			// In C calls we have to generate C strings
 			// `C.printf("hi")` => `printf("hi");`
+			escaped_val := it.val.replace_each(['"', '\\"',
+			'\n', '\\n',
+			'\r\n', '\\n'])
 			if g.is_c_call {
-				g.write('"$it.val"')
+				g.write('"$escaped_val"')
 			}
 			else {
-				g.write('tos3("$it.val")')
+				g.write('tos3("$escaped_val")')
 			}
 		}
 		// `user := User{name: 'Bob'}`