1 files changed, 66 insertions, 0 deletions
diff --git a/src/common/nullpo.cpp b/src/common/nullpo.cpp
new file mode 100644
index 0000000..6dd2736
--- /dev/null
+++ b/src/common/nullpo.cpp
@@ -0,0 +1,66 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include "nullpo.hpp"
+
+static void nullpo_info_core (const char *file, int line, const char *func,
+                              const char *fmt, va_list ap);
+
+/// Null check and print format
+bool nullpo_chk_f (const char *file, int line, const char *func,
+                   const void *target, const char *fmt, ...)
+{
+    va_list ap;
+
+    if (target)
+        return 0;
+
+    va_start (ap, fmt);
+    nullpo_info_core (file, line, func, fmt, ap);
+    va_end (ap);
+    return 1;
+}
+bool nullpo_chk (const char *file, int line, const char *func,
+                 const void *target)
+{
+    if (target)
+        return 0;
+
+    nullpo_info_core (file, line, func, NULL, NULL);
+    return 1;
+}
+
+/// External functions
+void nullpo_info_f (const char *file, int line, const char *func,
+                    const char *fmt, ...)
+{
+    va_list ap;
+
+    va_start (ap, fmt);
+    nullpo_info_core (file, line, func, fmt, ap);
+    va_end (ap);
+}
+void nullpo_info (const char *file, int line, const char *func)
+{
+    nullpo_info_core (file, line, func, NULL, NULL);
+}
+
+/// Actual output function
+static void nullpo_info_core (const char *file, int line, const char *func,
+                              const char *fmt, va_list ap) __attribute__((format(printf, 4, 0)));
+static void nullpo_info_core (const char *file, int line, const char *func,
+                              const char *fmt, va_list ap)
+{
+    if (!file)
+        file = "??";
+    if (!func || !*func)
+        func = "unknown";
+
+    fprintf (stderr, "%s:%d: in func `%s': NULL pointer\n", file, line, func);
+    if (fmt && *fmt)
+    {
+        vfprintf (stderr, fmt, ap);
+        if (fmt[strlen (fmt) - 1] != '\n')
+            fputc('\n', stderr);
+    }
+}