Add iniGetIntInRange() for range-enforced integer values

If you're going to use a read key value as say, an index into fixed-length array, then you better be sure it's within an expected range.

src/xpdev/ini_file.c

@@ -1691,6 +1691,23 @@ int iniGetInteger(str_list_t list, const char* section, const char* key, int def
 	return(parseInteger(vp));
 }
 
+int iniGetIntInRange(str_list_t list, const char* section, const char* key, int min, int deflt, int max)
+{
+	char*	vp=NULL;
+	int		result;
+
+	get_value(list, section, key, NULL, &vp, /* literals_supported: */FALSE);
+
+	if(vp==NULL || *vp==0)	/* blank value or missing key */
+		return deflt;
+
+	result = parseInteger(vp);
+	if(result < min || result > max)
+		return deflt;
+	return result;
+}
+
+
 uint iniGetUInteger(str_list_t list, const char* section, const char* key, uint deflt)
 {
 	char*	vp=NULL;

src/xpdev/ini_file.h

@@ -13,21 +13,9 @@
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@@ -164,6 +152,8 @@ DLLEXPORT str_list_t 	iniGetStringList(str_list_t, const char* section, const ch
 							,const char* sep, const char* deflt);
 DLLEXPORT int 			iniGetInteger(str_list_t, const char* section, const char* key
 							,int deflt);
+DLLEXPORT int 			iniGetIntInRange(str_list_t, const char* section, const char* key
+							,int min, int deflt, int max);
 DLLEXPORT uint 			iniGetUInteger(str_list_t, const char* section, const char* key
 							,uint deflt);
 DLLEXPORT short 		iniGetShortInt(str_list_t, const char* section, const char* key