added support for FreeBSD. Closes #4.

src/whereami.c

@@ -545,6 +545,114 @@ int WAI_PREFIX(getModulePath)(char* out, int capacity, int* dirname_length)
   return length;
 }
 
+#elif defined(__FreeBSD__)
+
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <dlfcn.h>
+
+WAI_FUNCSPEC
+int WAI_PREFIX(getExecutablePath)(char* out, int capacity, int* dirname_length)
+{
+  char buffer1[PATH_MAX];
+  char buffer2[PATH_MAX];
+  char* path = buffer1;
+  char* resolved = NULL;
+  int length = -1;
+
+  for (;;)
+  {
+    int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
+    size_t size = sizeof(buffer1);
+
+    if (sysctl(mib, (u_int)(sizeof(mib) / sizeof(mib[0])), path, &size, NULL, 0) != 0)
+        break;
+
+    resolved = realpath(path, buffer2);
+    if (!resolved)
+      break;
+
+    length = (int)strlen(resolved);
+    if (length <= capacity)
+    {
+      memcpy(out, resolved, length);
+
+      if (dirname_length)
+      {
+        int i;
+
+        for (i = length - 1; i >= 0; --i)
+        {
+          if (out[i] == '/')
+          {
+            *dirname_length = i;
+            break;
+          }
+        }
+      }
+    }
+
+    break;
+  }
+
+  if (path != buffer1)
+    WAI_FREE(path);
+
+  return length;
+}
+
+WAI_NOINLINE
+WAI_FUNCSPEC
+int WAI_PREFIX(getModulePath)(char* out, int capacity, int* dirname_length)
+{
+  char buffer[PATH_MAX];
+  char* resolved = NULL;
+  int length = -1;
+
+  for(;;)
+  {
+    Dl_info info;
+
+    if (dladdr(WAI_RETURN_ADDRESS(), &info))
+    {
+      resolved = realpath(info.dli_fname, buffer);
+      if (!resolved)
+        break;
+
+      length = (int)strlen(resolved);
+      if (length <= capacity)
+      {
+        memcpy(out, resolved, length);
+
+        if (dirname_length)
+        {
+          int i;
+
+          for (i = length - 1; i >= 0; --i)
+          {
+            if (out[i] == '/')
+            {
+              *dirname_length = i;
+              break;
+            }
+          }
+        }
+      }
+    }
+
+    break;
+  }
+
+  return length;
+}
+
+#else
+
+#error unsupported platform
+
 #endif
 
 #ifdef __cplusplus