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/*
** HUGEREAD.C - "Universal" PC read and write functions using huge data
** and far pointers.
**
** NOTES:
**
** 1. If these functions are called with a prototype in scope, passed
** parameters will be coerced to the proper data types.
**
** 2. Since these call read() and write(), all normal mode flags which
** are supported by individual compilers will be honored.
**
** 3. In small data memory models (S, T, and M), an intermediate buffer
** is allocated and used. In large data models (L and C), the data
** are read/written directly from/to target memory.
**
** 4. Like many mixed-model functions, this may generate lots of warnings
** with many compilers. Despite this, it really does generate correct
** code for all major PC compilers.
**
** Original Copyright 1992 by Bob Stout as part of
** the MicroFirm Function Library (MFL)
**
** This subset version is hereby donated to the public domain.
*/
#include <dos.h>
#include <io.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdio.h>
#ifdef __TURBOC__
#define FAR far
#else
#define FAR _far
#endif
#ifndef min
#define min(x,y) (((x) <= (y)) ? (x) : (y))
#endif
#ifndef MK_FP
#define MK_FP(seg,offset) \
((void FAR *)(((unsigned long)(seg)<<16) | (unsigned)(offset)))
#endif
/*
** Get the largest buffer possible.
*/
static size_t gettmp(char **buf)
{
size_t bufsiz;
for (bufsiz = 0x4000; bufsiz >= 128; bufsiz >>= 1)
{
if (NULL != (*buf = (char *) malloc(bufsiz)))
return bufsiz;
}
return 0;
}
/*
** Normalize a far pointer
*/
void FAR *farnormal(void FAR *ptr)
{
unsigned long base, para;
base = (unsigned long)(ptr & 0xffff000fL);
para = (unsigned long)(ptr & 0x0000fff0L);
para <<= 12;
return (void FAR *)(base + para);
}
/*
** Read any size block to anywhere in memory
*/
long hugeread(int fh, char FAR *buf, long size)
{
long count;
size_t bufsiz;
char *tmp;
long ercode = size;
if (4 > sizeof(void *))
{
if (0 == (bufsiz = gettmp(&tmp)))
return -1L;
}
else
{
tmp = (char *)buf;
bufsiz = 0x4000;
}
while (0 < (count = min(size, (long)bufsiz)))
{
int i, numread = read(fh, tmp, (size_t)count);
if (1 > numread || numread != (int)count)
return -1L;
if (4 > sizeof(void *))
{
for (i = 0; i < count; ++i)
buf[i] = tmp[i];
}
buf = farnormal(buf + count);
size -= count;
if (2 < sizeof(void *))
tmp = (char *)buf;
}
return ercode;
}
/*
** Write any size block from anywhere in memory
*/
long hugewrite(int fh, char FAR *buf, long size)
{
long count;
size_t bufsiz;
char *tmp;
long ercode = size;
if (4 > sizeof(void *))
{
if (0 == (bufsiz = gettmp(&tmp)))
return -1L;
}
else
{
tmp = (char *)buf;
bufsiz = 0x4000;
}
while (0 < (count = min(size, (long)bufsiz)))
{
int i, numwrite;
if (4 > sizeof(void *))
{
for (i = 0; i < count; ++i)
tmp[i] = buf[i];
}
numwrite = write(fh, tmp, (size_t)count);
if (1 > numwrite || numwrite != (int)count)
return -1L;
buf = farnormal(buf + count);
size -= count;
if (2 < sizeof(void *))
tmp = (char *)buf;
}
return ercode;
}
/*
** Read any size block to anywhere in memory
*/
long hugefread(FILE *fp, char FAR *buf, long size)
{
long count;
size_t bufsiz;
char *tmp;
long ercode = size;
if (4 > sizeof(void *))
{
if (0 == (bufsiz = gettmp(&tmp)))
return -1L;
}
else
{
tmp = (char *)buf;
bufsiz = 0x4000;
}
while (0 < (count = min(size, (long)bufsiz)))
{
int i, numread = fread(tmp, 1, (size_t)count, fp);
if (1 > numread || numread != (int)count)
return -1L;
if (4 > sizeof(void *))
{
for (i = 0; i < count; ++i)
buf[i] = tmp[i];
}
buf = farnormal(buf + count);
size -= count;
if (2 < sizeof(void *))
tmp = (char *)buf;
}
return ercode;
}
/*
** Write any size block from anywhere in memory
*/
long hugefwrite(FILE *fp, char FAR *buf, long size)
{
long count;
size_t bufsiz;
char *tmp;
long ercode = size;
if (4 > sizeof(void *))
{
if (0 == (bufsiz = gettmp(&tmp)))
return -1L;
}
else
{
tmp = (char *)buf;
bufsiz = 0x4000;
}
while (0 < (count = min(size, (long)bufsiz)))
{
int i, numwrite;
if (4 > sizeof(void *))
{
for (i = 0; i < count; ++i)
tmp[i] = buf[i];
}
numwrite = fwrite(tmp, 1, (size_t)count, fp);
if (1 > numwrite || numwrite != (int)count)
return -1L;
buf = farnormal(buf + count);
size -= count;
if (2 < sizeof(void *))
tmp = (char *)buf;
}
return ercode;
}
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