The Independent JPEG Group's JPEG software v1

jerror.c

@@ -0,0 +1,67 @@
+/*
+ * jerror.c
+ *
+ * Copyright (C) 1991, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains simple error-reporting and trace-message routines.
+ * These are suitable for Unix-like systems and others where writing to
+ * stderr is the right thing to do.  If the JPEG software is integrated
+ * into a larger application, you may well need to replace these.
+ *
+ * The error_exit() routine should not return to its caller.  Within a
+ * larger application, you might want to have it do a longjmp() to return
+ * control to the outer user interface routine.  This should work since
+ * the portable JPEG code doesn't use setjmp/longjmp.  However, this won't
+ * release allocated memory or close temp files --- some bookkeeping would
+ * need to be added to the memory manager module to make that work.
+ *
+ * These routines are used by both the compression and decompression code.
+ */
+
+#include "jinclude.h"
+#ifdef __STDC__
+#include <stdlib.h>		/* to declare exit() */
+#endif
+
+
+static external_methods_ptr methods; /* saved for access to message_parm */
+
+
+METHODDEF void
+trace_message (char *msgtext)
+{
+  fprintf(stderr, msgtext,
+	  methods->message_parm[0], methods->message_parm[1],
+	  methods->message_parm[2], methods->message_parm[3],
+	  methods->message_parm[4], methods->message_parm[5],
+	  methods->message_parm[6], methods->message_parm[7]);
+  fprintf(stderr, "\n");
+}
+
+
+METHODDEF void
+error_exit (char *msgtext)
+{
+  trace_message(msgtext);
+  exit(1);
+}
+
+
+/*
+ * The method selection routine for simple error handling.
+ * The system-dependent setup routine should call this routine
+ * to install the necessary method pointers in the supplied struct.
+ */
+
+GLOBAL void
+jselerror (external_methods_ptr emethods)
+{
+  methods = emethods;		/* save struct addr for msg parm access */
+
+  emethods->error_exit = error_exit;
+  emethods->trace_message = trace_message;
+
+  emethods->trace_level = 0;	/* default = no tracing */
+}