Merge pull request KageKirin#3 from KageKirin/b-openfile-cb

added custom callback for fileopen()

Author: bkaradzic

cpp3.c

@@ -35,7 +35,12 @@ ReturnCode fpp_openfile(struct Global *global, char *filename)
   FILE *fp;
   ReturnCode ret;
 
-  if ((fp = fopen(filename, "r")) == NULL)
+  if (global->openfile)
+    fp = global->openfile(filename, "r", global->userdata);
+  else
+    fp = fopen(filename, "r");
+
+  if (fp == NULL)
     ret=FPP_OPEN_ERROR;
   else
     ret=fpp_addfile(global, fp, filename);
@@ -268,6 +273,9 @@ int fpp_dooptions(struct Global *global, struct fppTag *tags)
     case FPPTAG_ALLOW_INCLUDE_LOCAL:
       global->allowincludelocal=(tags->data?1:0);
       break;
+    case FPPTAG_FILEOPENFUNC:
+      global->openfile = (FILE* (*)(char *,char *))tags->data;
+      break;
     default:
       fpp_cwarn(global, WARN_INTERNAL_ERROR, NULL);
       break;

cppadd.h

@@ -253,6 +253,8 @@ struct Global {
   char webmode; /* WWW process mode */
 
   char allowincludelocal;
+
+  FILE* (*openfile)(char *,char *, void *);
 };
 
 typedef enum {

fpp.h

@@ -165,6 +165,10 @@ struct fppTag {
 /* Allow include "X" (rather than <X>) to search local files, default is FPP_TRUE */
 #define FPPTAG_ALLOW_INCLUDE_LOCAL 35
 
+/* Fileopen function. If set, this is called when FPP tries to open a file: */
+#define FPPTAG_FILEOPENFUNC 36 /* data is function pointer to a
+			   "FILE* (*)(char * filename, char * mode, void * userdata)", default is NULL */
+
 int fppPreProcess(struct fppTag *);
 
 #ifdef __cplusplus