New p3dWrapper executable that simply locates the .p3d file on the PATH and passes it to panda3d(.exe)

direct/src/p3d/p3dWrapper.c

@@ -0,0 +1,89 @@
+/* Filename: p3dWrapper.c
+ * Created by:  rdb (16Jan10)
+ *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ *
+ * PANDA 3D SOFTWARE
+ * Copyright (c) Carnegie Mellon University.  All rights reserved.
+ *
+ * All use of this software is subject to the terms of the revised BSD
+ * license.  You should have received a copy of this license along
+ * with this source code in a file named "LICENSE."
+ *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/* p3dWrapper is a small wrapper executable that locates a .p3d file
+   on the PATH that has the same basename as the executable, and runs
+   it with panda3d.exe that is also located on the PATH.  */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#ifdef _WIN32
+const char delims[] = ";";
+#else
+const char delims[] = ":";
+#endif
+
+int main (int argc, char* argv[]) {
+  char* p3dname = strdup (argv [0]);
+  strcat (p3dname, ".p3d");
+  
+  char* p3dfile = NULL;
+  char* panda3d = NULL;
+  char* path = getenv ("PATH");
+  if (path) {
+    // Locate the .p3d file and panda3d(.exe) on PATH.
+    char* pathtok = strtok(path, delims);
+    while (pathtok != NULL) {
+      p3dfile = strdup (pathtok);
+#ifdef _WIN32
+      strcat (p3dfile, "\\");
+#else
+      strcat (p3dfile, "/");
+#endif
+      strcat (p3dfile, p3dname);
+      if (access (p3dfile, R_OK) == 0) {
+        break;
+      } else {
+        p3dfile = NULL;
+      }
+      panda3d = strdup (pathtok);
+#ifdef _WIN32
+      strcat (panda3d, "\\panda3d.exe");
+#else
+      strcat (panda3d, "/panda3d");
+#endif
+      if (access (panda3d, X_OK) == 0) {
+        break;
+      } else {
+        panda3d = NULL;
+      }
+      pathtok = strtok(NULL, delims);
+    }
+  }
+  if (p3dfile == NULL) {
+    p3dfile = p3dname;
+  }
+  if (panda3d == NULL) {
+#ifdef _WIN32
+    panda3d = "panda3d.exe";
+#else
+    panda3d = "panda3d";
+#endif
+  }
+  
+  // Fill in a new argv object to pass to panda3d(.exe).
+  char** newargv = malloc(sizeof(char*) * (argc + 2));
+  newargv [0] = argv [0];
+  newargv [1] = p3dfile;
+  int i;
+  for (i = 1; i < argc; ++i) {
+    newargv [i + 1] = argv [i];
+  }
+  newargv [argc + 2] = 0;
+  return execvp (panda3d, newargv);
+}
+