fuzz: Skip the tests if fmemopen() is not found

fmemopen() is a function that is only provided with *NIX systems, so we
ought to check for its presence in order to build and run the tests
in fuzz/ fully, otherwise, we just skip the tests.

Also include headers according to how they are found, and add fallbacks
for Visual Studio that do not have stdint.h yet.

configure.ac

@@ -312,7 +312,7 @@ AC_SUBST(PSL_TESTFILE)
 
 # check for alloca / alloca.h
 AC_FUNC_ALLOCA
-AC_CHECK_FUNCS([strndup clock_gettime])
+AC_CHECK_FUNCS([strndup clock_gettime fmemopen])
 
 # Override the template file name of the generated .pc file, so that there
 # is no need to rename the template file when the API version changes.

fuzz/fuzzer.h

@@ -22,8 +22,15 @@
  * This file is part of libpsl.
  */
 
+#include <config.h>
+
 #include <stddef.h> /* size_t */
+
+#ifdef HAVE_STDINT_H
 #include <stdint.h> /* uint8_t */
+#elif defined (_MSC_VER)
+typedef unsigned __int8 uint8_t;
+#endif
 
 #ifdef __cplusplus
 extern "C"

fuzz/libpsl_fuzzer.c

@@ -25,7 +25,13 @@
 #include <config.h>
 
 #include <assert.h> /* assert */
+
+#ifdef HAVE_STDINT_H
 #include <stdint.h> /* uint8_t */
+#elif defined (_MSC_VER)
+typedef unsigned __int8 uint8_t;
+#endif
+
 #include <stdlib.h> /* malloc, free */
 #include <string.h> /* memcpy */
 

fuzz/libpsl_load_dafsa_fuzzer.c

@@ -25,7 +25,13 @@
 #include <config.h>
 
 #include <assert.h> /* assert */
+
+#ifdef HAVE_STDINT_H
 #include <stdint.h> /* uint8_t */
+#elif defined (_MSC_VER)
+typedef unsigned __int8 uint8_t;
+#endif
+
 #include <stdlib.h> /* malloc, free */
 #include <string.h> /* memcpy */
 
@@ -34,6 +40,7 @@
 
 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 {
+#ifdef HAVE_FMEMOPEN
 	FILE *fp;
 	psl_ctx_t *psl;
 	char *in = (char *) malloc(size + 16);
@@ -62,6 +69,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 	psl_free(psl);
 
 	free(in);
+#endif
 
 	return 0;
 }

fuzz/libpsl_load_fuzzer.c

@@ -25,7 +25,13 @@
 #include <config.h>
 
 #include <assert.h> /* assert */
+
+#ifdef HAVE_STDINT_H
 #include <stdint.h> /* uint8_t */
+#elif defined (_MSC_VER)
+typedef unsigned __int8 uint8_t;
+#endif
+
 #include <stdlib.h> /* malloc, free */
 #include <string.h> /* memcpy */
 
@@ -34,6 +40,7 @@
 
 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 {
+#ifdef HAVE_FMEMOPEN
 	FILE *fp;
 	psl_ctx_t *psl;
 
@@ -50,6 +57,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 		fclose(fp);
 
 	psl_load_file("/dev/null");
+#endif
 
 	return 0;
 }

fuzz/main.c

@@ -25,9 +25,17 @@
 #include "../config.h"
 
 #include <stdio.h>
+
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
+
 #include <stdlib.h>
+
+#ifdef HAVE_STDINT_H
 #include <stdint.h>
+#endif
+
 #include <string.h>
 #include <fcntl.h>
 #include <errno.h>
@@ -35,7 +43,7 @@
 
 #include "fuzzer.h"
 
-#ifdef TEST_RUN
+#if defined (TEST_RUN) && defined (HAVE_FMEMOPEN)
 
 #include <dirent.h>
 #ifdef HAVE_ALLOCA_H
@@ -114,7 +122,7 @@ int main(int argc, char **argv)
 	return 0;
 }
 
-#else
+#else /* TEST_RUN && HAVE_FMEMOPEN */
 
 #ifndef __AFL_LOOP
 static int __AFL_LOOP(int n)
@@ -132,6 +140,7 @@ static int __AFL_LOOP(int n)
 
 int main(int argc, char **argv)
 {
+#ifdef HAVE_FMEMOPEN
 	int ret;
 	unsigned char buf[64 * 1024];
 
@@ -144,6 +153,9 @@ int main(int argc, char **argv)
 	}
 
 	return 0;
+#else
+	exit (77);
+#endif
 }
 
-#endif /* TEST_RUN */
+#endif /* TEST_RUN && HAVE_FMEMOPEN*/