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Crawly Crypt Collection 1
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crawlyvol1.bin
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compiler
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nasm20b
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nasm_src
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helper.c
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C/C++ Source or Header
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1993-01-19
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9KB
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385 lines
/* ---------------------------------------------------------------------- */
/* Copyright (C) 1991 by Natürlich! */
/* This file is copyrighted! */
/* Refer to the documentation for details. */
/* ---------------------------------------------------------------------- */
#include "defines.h"
#include "nasm.h"
#include OSBIND
#include "code.h"
#include <stddef.h> /* get size_t */
#include <string.h>
#include <stdlib.h>
#include "debug.h"
#if STATISTICS
#include "stats.h"
#include <stdio.h>
#endif
extern char outofmem[];
#if STATISTICS || ! VERSION
#define MAXHISTORY 256
#define MAXWATCHES 16
#define MAGIC 0x41424344L
static struct
{
byte huge *p;
lword size;
} history[ MAXHISTORY];
static struct watch
{
unsigned long magic;
unsigned char *p;
char *name;
short size;
short occupied;
unsigned long chksum;
} watches[ MAXWATCHES] =
{
{ MAGIC, 0, 0, 0, 0, 0 }, /* fill this up appropriately */
{ MAGIC, 0, 0, 0, 0, 0 },
{ MAGIC, 0, 0, 0, 0, 0 },
{ MAGIC, 0, 0, 0, 0, 0 },
{ MAGIC, 0, 0, 0, 0, 0 },
{ MAGIC, 0, 0, 0, 0, 0 },
{ MAGIC, 0, 0, 0, 0, 0 },
{ MAGIC, 0, 0, 0, 0, 0 },
{ MAGIC, 0, 0, 0, 0, 0 },
{ MAGIC, 0, 0, 0, 0, 0 },
{ MAGIC, 0, 0, 0, 0, 0 },
{ MAGIC, 0, 0, 0, 0, 0 },
{ MAGIC, 0, 0, 0, 0, 0 },
{ MAGIC, 0, 0, 0, 0, 0 },
{ MAGIC, 0, 0, 0, 0, 0 },
{ MAGIC, 0, 0, 0, 0, 0 }
};
unsigned long chksum( p, size)
unsigned char *p;
{
unsigned long x;
int i;
x = *p++;
for( i = 3; i-- && size; size--)
x = (x << 8) + *p++;
while( size--)
x = (x << 3) + *p++;
return( x);
}
void add_watch( p, size, name)
unsigned char *p;
size_t size;
char *name;
{
struct watch *q;
int i;
ENTER("add_watch");
if( ! p)
return;
for( q = watches, i = MAXWATCHES; i--; q++)
if( ! q->occupied)
{
q->magic = MAGIC;
q->p = p;
q->name = name;
q->size = size;
q->chksum = chksum( p, (int) size);
q->occupied = 1;
LEAVE();
return;
}
nierror("Watch space exhausted");
}
print_watches()
{
struct watch *q;
int i;
printf("Active watches:\n");
for( q = watches, i = MAXWATCHES; i--; q++)
if( q->occupied)
printf( "\t%s\n", q->name);
}
void del_watch( p)
unsigned char *p;
{
struct watch *q;
int i;
ENTER("del_watch");
if( ! p)
return;
for( q = watches, i = MAXWATCHES; i--; q++)
if( q->occupied && q->p == p)
{
q->occupied = 0;
LEAVE();
return;
}
nierror("Watch not found");
}
do_watch()
{
struct watch *q;
int i;
for( q = watches, i = MAXWATCHES; i--; q++)
{
if( q->magic != MAGIC)
nierror("Good work! You managed to clobber the watch space");
if( q->occupied && q->chksum != chksum( q->p, q->size))
{
auto char buffer[ 256];
if( q->name)
sprintf( buffer, "Someone clobbered >>%s<<", q->name);
else
sprintf( buffer, "Someone clobbered %d bytes @$%.8lX",
q->size, (long) q->p);
nierror( buffer);
}
}
}
check_mallocs()
{
int i = 0;
byte huge *p, huge *q, huge *r;
for( i = 0; i < MAXHISTORY; i++)
if( p = (byte huge *) history[ i].p)
{
q = p - sizeof( lword);
r = p + history[ i].size;
if( lbeek( q) != MAGIC ||
lbeek( r) != MAGIC)
nierror("Someone clobbered the malloc space");
}
}
do_check()
{
ENTER("do_check");
do_watch();
check_mallocs();
LEAVE();
}
bad_pointer( p)
byte huge *p;
{
int i = 0;
byte huge *q;
if( ! p)
return;
for( i = 0; i < MAXHISTORY; i++)
if( (q = history[ i].p) && p >= q && p < (q + history[ i].size))
return;
nierror("You got a bad pointer here");
}
#endif
byte huge *nmalloc( size)
lword size;
{
register byte volatile huge *p;
ENTER("nmalloc");
#if ! VERSION
if( size > 0x01000000)
nwarning("Probably some conversion trouble when calling nmalloc");
size += sizeof( lword) * 2;
#endif
#if STATISTICS
_mused += size;
if( _mused >= _maxused)
_maxused = _mused;
#endif
/* fucking TURBO.C libraries, nothing works */
#if OS == TOS && __TURBOC__ && ! defined( __PUREC__)
if( ! (p = (byte huge *) malloc( size)) || (long) p < 0)
#else
if( ! (p = (byte huge *) malloc( size)))
#endif
nferror( outofmem);
#if ! VERSION
memset( p, 0xFF, size);
# if OS == MSDOS
if( get_ADDR( p) < 0x10000 || get_ADDR( p) > 0x400000)
nierror( "Pointer trouble in paradise");
# endif
check_mallocs();
if( ((*p = 0x55) && *p != 0x55) || ((*p = 0xAA) && *p != 0xAA))
nierror("malloc is seriously fucked");
lbyte( p, MAGIC);
size -= sizeof( lword) * 2;
p += sizeof( lword);
lbyte( p + size, MAGIC);
#endif
#if STATISTICS || ! VERSION
{
register int i = 0;
while( history[ i].p && i++ < MAXHISTORY);
if( i == MAXHISTORY)
nierror("Statistic space for nmalloc exhausted");
history[ i].p = (byte huge *) p;
history[ i].size = size;
}
#endif
IMESS("Memory starts @$%8.8lX", (lword) p, 4);
LEAVE();
return( (byte huge *) p);
}
void nfree( p)
void huge *p;
{
ENTER("nfree");
if( ! p) /* check for p == NULL (Can happen!) */
return;
#if STATISTICS || ! VERSION
{
int i = 0;
while( history[ i].p != p && i++ < MAXHISTORY);
if( i == MAXHISTORY)
nierror("Faulty nfree");
#if STATISTICS
_mused -= history[ i].size;
#endif
memset( (char *) p - sizeof( lword), 0xFE, history[ i].size + 2 * sizeof( lword));
history[i].p = 0;
}
#endif
#if ! VERSION
(char huge *) p -= sizeof( lword);
#endif
free( p);
LEAVE();
}
char *get_filename( pathname)
char *pathname;
{
register char c,
*p = pathname;
while( (c = *p++) && c != DIRSLASH);
if( ! c)
return( pathname);
while( *p++);
while( *--p != DIRSLASH);
return( ++p);
}
void complete( filename, ext, force)
char *filename, *ext;
{
char *x;
ENTER("complete");
if( x = strrchr( filename, '.'))
{
if( strrchr( filename, DIRSLASH) > x)
goto dis;
if( force)
while( *++x = *++ext);
}
else
dis:
strcat( filename, ext);
LEAVE();
}
#if LOWERFILE
#include <ctype.h>
void downcase( s)
register char *s;
{
register char c;
while( c = *s)
*s++ = tolower( c);
}
#endif
/* ---------------------------------------------------------- */
/* Character representation (from Your Atari Computer) */
/* $00-$1F -> $40-$5F (+ $40) */
/* $20-$5F -> $00-$3F (- $20) */
/* $60-$7F -> $60-$7F (+-$00) */
/* $80-$9F -> $C0-$DF (+ $40) */
/* $A0-$DF -> $80-$BF (- $20) */
/* $EO-$FF -> $E0-$FF (+-$00) */
/* ---------------------------------------------------------- */
byte scrtab[] =
{
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F,
0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,
0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7,
0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,
0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7,
0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,
0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF
};