Switch to C99.

configure.ac

@@ -5,9 +5,9 @@ AM_CONFIG_HEADER(config.h)
 AM_INIT_AUTOMAKE
 
 # Checks for programs
-AC_PROG_CC
+AC_PROG_CC_C99
 
-# Set language to C++
+# Set language to C
 AC_LANG_C
 
 # Checks for header files
@@ -33,6 +33,8 @@ AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK
 AC_FUNC_UTIME_NULL
 AC_CHECK_FUNCS([fchdir fdatasync fork ftruncate lchown memset mkdir mkfifo rmdir setxattr strdup strerror utime])
 
+AC_SUBST([EXTRA_CFLAGS], ["-Wall -Werror -Wextra"])
+
 AC_CONFIG_FILES([Makefile
  src/Makefile
  ])

src/Makefile.am

@@ -1,4 +1,4 @@
-INCLUDES = $(FUSE_CFLAGS)
+INCLUDES = $(FUSE_CFLAGS) $(EXTRA_CFLAGS)
 
 bin_PROGRAMS=pifs
 

src/pifs.c

@@ -5,6 +5,9 @@
 #include <stddef.h>
 #include <stdio.h>
 #include <string.h>
+#include <sys/statvfs.h>
+#include <sys/xattr.h>
+#include <unistd.h>
 #include <config.h>
 #include <fuse/fuse.h>
 
@@ -151,7 +154,7 @@ static int pifs_write(const char *path, const char *buf, size_t count,
 static int pifs_statfs(const char *path, struct statvfs *buf)
 {
   FULL_PATH(path);
-  int ret = statfs(full_path, buf);
+  int ret = statvfs(full_path, buf);
   return ret == -1 ? -errno : ret;
 }