Fix infinite loop when lexing an invalid newline sequence

Makefile

@@ -1,4 +1,4 @@
-.PHONY: all clean clean-objects run sanitize validate
+.PHONY: all clean clean-objects clean-reports run sanitize validate fuzz
 
 CC=clang
 LD=clang
@@ -9,8 +9,8 @@ SOURCES = $(shell find src/ -type f -name '*.c')
 OBJECTS = $(SOURCES:.c=.o)
 DEPENDENCIES = $(SOURCES:.c=.d)
 TARGET?=oas
-OUTPUTS=oas oas-asan oas-msan
+OUTPUTS=oas oas-asan oas-msan oas-afl
-RUNARGUMENTS=-tokens test.asm
+RUNARGUMENTS?=-tokens tests/input/valid.asm
 
 all: $(TARGET)
 	
@@ -18,6 +18,12 @@ all: $(TARGET)
 run: $(TARGET)
 	./$(TARGET) $(RUNARGUMENTS)
 
+fuzz:
+	make CC="afl-clang-fast" LD="afl-clang-fast" TARGET="oas-afl" clean-objects all
+	make clean-objects
+	mkdir -p reports/afl
+	afl-fuzz -i tests/input -o reports/afl -m none -- ./oas-afl -tokens @@
+
 sanitize:
 	make CFLAGS="$(CFLAGS) -fsanitize=address,undefined" LDFLAGS="-fsanitize=address,undefined" TARGET="oas-asan" clean-objects all
 	make CFLAGS="$(CFLAGS) -fsanitize=memory -fsanitize-memory-track-origins=2" LDFLAGS="-fsanitize=memory -fsanitize-memory-track-origins=2" TARGET="oas-msan" clean-objects all 
@@ -37,6 +43,8 @@ $(TARGET): $(OBJECTS)
 clean-objects:
 	rm -f $(OBJECTS) $(DEPENDENCIES)
 
+clean-reports:
+	rm -rf reports/
+
 clean: clean-objects
 	rm -f $(TARGET) $(OUTPUTS)
-	rm -rf reports/

src/lexer.c

@@ -310,6 +310,7 @@ error_t *lexer_next_newline(lexer_t *lex, lexer_token_t *token) {
         lex->character_number = 0;
         lex->line_number += 1;
     } else {
+        lexer_shift_buffer(lex, 1);
         token->id = TOKEN_ERROR;
         lex->character_number += 1;
         token->value = strdup((char[]){lex->buffer[0]});

validate.sh

@@ -3,7 +3,9 @@
 set -euo pipefail
 
 # Start with static analysis
-scan-build -o reports/ -plist-html --status-bugs make clean all
+make clean all
+mkdir -p reports/static-analysis
+scan-build -o reports/static-analysis/ -plist-html --status-bugs make all
 
 # Run the sanitizer builds and valgrind
 make clean sanitize all