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/*
Compute the number of bytes required for storage of a given enum,
assuming that the current compiler gives the same result as the
compiler used for compiling the library being introspected.
Adapted from girepository/giroffsets.c, in the gobject-introspection
distribution. Original copyright below.
*/
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
* GObject introspection: Compute structure offsets
*
* Copyright (C) 2008 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/* The C standard specifies that an enumeration can be any char or any signed
* or unsigned integer type capable of representing all the values of the
* enumeration. We use test enumerations to figure out what choices the
* compiler makes. (Ignoring > 32 bit enumerations)
*/
#include <glib.h>
typedef enum {
ENUM_1 = 1 /* compiler could use int8, uint8, int16, uint16, int32, uint32 */
} Enum1;
typedef enum {
ENUM_2 = 128 /* compiler could use uint8, int16, uint16, int32, uint32 */
} Enum2;
typedef enum {
ENUM_3 = 257 /* compiler could use int16, uint16, int32, uint32 */
} Enum3;
typedef enum {
ENUM_4 = G_MAXSHORT + 1 /* compiler could use uint16, int32, uint32 */
} Enum4;
typedef enum {
ENUM_5 = G_MAXUSHORT + 1 /* compiler could use int32, uint32 */
} Enum5;
typedef enum {
ENUM_6 = ((guint)G_MAXINT) + 1 /* compiler could use uint32 */
} Enum6;
typedef enum {
ENUM_7 = -1 /* compiler could use int8, int16, int32 */
} Enum7;
typedef enum {
ENUM_8 = -129 /* compiler could use int16, int32 */
} Enum8;
typedef enum {
ENUM_9 = G_MINSHORT - 1 /* compiler could use int32 */
} Enum9;
int
_gi_get_enum_storage_bytes (gint64 min_value, gint64 max_value)
{
int width;
if (min_value < 0)
{
if (min_value > -128 && max_value <= 127)
width = sizeof(Enum7);
else if (min_value >= G_MINSHORT && max_value <= G_MAXSHORT)
width = sizeof(Enum8);
else
width = sizeof(Enum9);
}
else
{
if (max_value <= 127)
{
width = sizeof (Enum1);
}
else if (max_value <= 255)
{
width = sizeof (Enum2);
}
else if (max_value <= G_MAXSHORT)
{
width = sizeof (Enum3);
}
else if (max_value <= G_MAXUSHORT)
{
width = sizeof (Enum4);
}
else if (max_value <= G_MAXINT)
{
width = sizeof (Enum5);
}
else
{
width = sizeof (Enum6);
}
}
if (width == 1 || width == 2 || width == 4 || width == 8) {
return width;
} else {
g_error("Unexpected enum width %d", width);
}
}
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