/usr/include/allegro/platform/aldjgpp.h is in liballegro4-dev 2:4.4.2-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* /\ _ \ /\_ \ /\_ \
* \ \ \L\ \\//\ \ \//\ \ __ __ _ __ ___
* \ \ __ \ \ \ \ \ \ \ /'__`\ /'_ `\/\`'__\/ __`\
* \ \ \/\ \ \_\ \_ \_\ \_/\ __//\ \L\ \ \ \//\ \L\ \
* \ \_\ \_\/\____\/\____\ \____\ \____ \ \_\\ \____/
* \/_/\/_/\/____/\/____/\/____/\/___L\ \/_/ \/___/
* /\____/
* \_/__/
*
* Configuration defines for use with djgpp.
*
* By Shawn Hargreaves.
*
* See readme.txt for copyright information.
*/
#ifndef SCAN_DEPEND
#include <pc.h>
#include <dir.h>
#include <dpmi.h>
#include <go32.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/farptr.h>
#endif
/* describe this platform */
#define ALLEGRO_PLATFORM_STR "djgpp"
#define ALLEGRO_DOS
#define ALLEGRO_I386
#define ALLEGRO_LITTLE_ENDIAN
#define ALLEGRO_GUESS_INTTYPES_OK
/* inttypes.h and stdint.h not available in djgpp 2.02 */
#define ALLEGRO_CONSOLE_OK
#define ALLEGRO_VRAM_SINGLE_SURFACE
#define ALLEGRO_USE_CONSTRUCTOR
#ifdef __cplusplus
extern "C" {
#endif
/* memory locking macros */
void _unlock_dpmi_data(void *addr, int size);
#define END_OF_FUNCTION(x) void x##_end(void) { }
#define END_OF_STATIC_FUNCTION(x) static void x##_end(void) { }
#define LOCK_DATA(d, s) _go32_dpmi_lock_data((void *)d, s)
#define LOCK_CODE(c, s) _go32_dpmi_lock_code((void *)c, s)
#define UNLOCK_DATA(d,s) _unlock_dpmi_data((void *)d, s)
#define LOCK_VARIABLE(x) LOCK_DATA((void *)&x, sizeof(x))
#define LOCK_FUNCTION(x) LOCK_CODE((void *)x, (intptr_t)x##_end - (intptr_t)x)
/* long filename status */
#ifdef _USE_LFN
#define ALLEGRO_LFN _USE_LFN
#else
#define ALLEGRO_LFN 0
#endif
/* selector for video memory bitmaps */
#define _video_ds() _dos_ds
/* helpers for talking to video memory */
#define bmp_select(bmp) _farsetsel((bmp)->seg)
#define bmp_write8(addr, c) _farnspokeb(addr, c)
#define bmp_write15(addr, c) _farnspokew(addr, c)
#define bmp_write16(addr, c) _farnspokew(addr, c)
#define bmp_write24(addr, c) ({ _farnspokew(addr, c&0xFFFF); \
_farnspokeb(addr+2, c>>16); })
#define bmp_write32(addr, c) _farnspokel(addr, c)
#define bmp_read8(addr) _farnspeekb(addr)
#define bmp_read15(addr) _farnspeekw(addr)
#define bmp_read16(addr) _farnspeekw(addr)
#define bmp_read32(addr) _farnspeekl(addr)
#define bmp_read24(addr) (_farnspeekl(addr) & 0xFFFFFF)
#ifdef __cplusplus
}
#endif
/* describe the asm syntax for this platform */
#define ALLEGRO_ASM_PREFIX "_"
#define ALLEGRO_ASM_USE_FS
/* arrange for other headers to be included later on */
#define ALLEGRO_EXTRA_HEADER "allegro/platform/aldos.h"
#define ALLEGRO_INTERNAL_HEADER "allegro/platform/aintdos.h"
#define ALLEGRO_ASMCAPA_HEADER "obj/djgpp/asmcapa.h"
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