implement logger callback

configure.ac

@@ -40,7 +40,7 @@ AC_TYPE_UINT64_T
 AC_TYPE_UINT8_T
 
 # Checks for library functions.
-AC_CHECK_FUNCS([memset mkdir sqrt strchr strdup strstr strtoul])
+AC_CHECK_FUNCS([memset mkdir sqrt strchr strdup strstr strtoul vasprintf])
 
 AC_CONFIG_FILES([Makefile
                  src/Makefile src/aribb24.pc])

src/aribb24.c

@@ -23,9 +23,18 @@
 #ifndef ARIBB24_MAIN_C
 #define ARIBB24_MAIN_C 1
 
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#ifdef HAVE_VASPRINTF
+#define _GNU_SOURCE
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stdarg.h>
 
 #include "aribb24/aribb24.h"
 #include "aribb24_private.h"
@@ -34,6 +43,31 @@
 #include "aribb24/decoder.h"
 #include "decoder_private.h"
 
+void arib_log( arib_instance_t *p_instance, const char *psz_format, ... )
+{
+#ifdef HAVE_VASPRINTF
+    va_list args;
+    free( p_instance->p->psz_last_error );
+    va_start( args, psz_format );
+    if ( vasprintf( &p_instance->p->psz_last_error, psz_format, args ) < 0 )
+    {
+        p_instance->p->psz_last_error = NULL;
+        return;
+    }
+
+    if ( p_instance->p->pf_messages )
+    {
+        p_instance->p->pf_messages( p_instance->p->p_opaque,
+                                    p_instance->p->psz_last_error );
+    }
+    else
+    {
+        // vprintf ?
+    }
+    va_end( args );
+#endif
+}
+
 arib_instance_t * arib_instance_new( void *p_opaque )
 {
     arib_instance_t *p_instance = calloc( 1, sizeof(*p_instance) );
@@ -56,6 +90,7 @@ void arib_instance_destroy( arib_instance_t *p_instance )
         arib_decoder_free( p_instance->p->p_decoder ); 
     if ( p_instance->p->p_parser )
         arib_parser_free( p_instance->p->p_parser ); 
+    free( p_instance->p->psz_last_error );
     free( p_instance );
 }
 

src/aribb24_private.h

@@ -30,6 +30,9 @@ struct arib_instance_private_t
     arib_decoder_t *p_decoder;
     arib_parser_t *p_parser;
     char *psz_base_path;
+    char *psz_last_error;
 };
 
+void arib_log( arib_instance_t *, const char *, ... );
+
 #endif

src/decoder.c

@@ -30,6 +30,7 @@
 #include <stdint.h>
 
 #include "aribb24/decoder.h"
+#include "aribb24_private.h"
 #include "decoder_private.h"
 #include "aribb24/convtable.h"
 #include "aribb24/decoder_macro.h"