parsing filename for filetype

funcs/utils.c

@@ -1,7 +1,7 @@
 
 
 #include  <stdio.h>
-
+#include  <string.h>
 
 #include  "../floatimg.h"
 
@@ -42,3 +42,24 @@ if (1 == foo) {
 return -1;
 }
 /* --------------------------------------------------------------------- */
+int format_from_extension(char *fname)
+{
+char		*cptr;
+
+cptr = rindex(fname, '.');
+if (NULL==cptr) {
+	fprintf(stderr, "do dot in %s\n", fname);
+	return -1;
+	}
+
+#if DEBUG_LEVEL
+fprintf(stderr, "[%s]  -->  [%s]\n", fname, cptr);
+#endif
+
+if (!strcasecmp(cptr, ".pnm"))	return FILE_TYPE_PNM;
+if (!strcasecmp(cptr, ".fimg"))	return FILE_TYPE_FIMG;
+if (!strcasecmp(cptr, ".png"))	return FILE_TYPE_PNG;
+
+return -1;
+}
+/* --------------------------------------------------------------------- */