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longio.c
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C/C++ Source or Header
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1992-05-06
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2KB
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125 lines
#include <stdio.h>
#include "convert.h"
extern long filpos;
extern int debug;
extern int printing;
extern char buf[];
/*
* Get a longword or complain about premature EOF
*
*/
getlong(fd, p_lw)
int fd;
long *p_lw;
{
if (readlong(fd, p_lw) == EOF)
panic("Premature EOF getting longword");
return OK;
}
/*
* Read 68000 longword from file,
* stuff it into '*p_lw' in the
* host machine's longword format.
*
*/
readlong(fd, p_lw)
int fd;
long *p_lw;
{
char buf[4], *out;
int i;
out = (char *)p_lw;
if (read(fd, buf, 4) != 4) /* probably end of file */
return EOF;
filpos += 4;
/*
* 8086/8088 conversion
* hh hl lh ll ==> ll lh hl hh
*/
out[0] = buf[3];
out[1] = buf[2];
out[2] = buf[1];
out[3] = buf[0];
}
/*
* Write word to file,
* in 68000 format.
*/
writeword(fd, w)
int fd;
unsigned int w;
{
char buf[2], *out;
out = (char *)&w;
buf[0] = out[1];
buf[1] = out[0];
if (write(fd, buf, 2) != 2)
panic("Write error (word)");
}
/*
* Write longword to file, in
* 68000 format.
*/
writelong(fd, lw)
int fd;
long lw;
{
char buf[4], *out;
int i;
out = (char *)&lw;
buf[0] = out[3];
buf[1] = out[2];
buf[2] = out[1];
buf[3] = out[0];
if (write(fd, buf, 4) != 4)
panic("Write error (longword)");
}
/*
* Read-and-write (copy from one
* file to another).
*/
randw(ifd, count, ofd)
int ifd;
long count;
int ofd;
{
if(debug)printf("~ randw(%d, %ld, %d)\n", ifd, count, ofd);
for (; count > BUFFERSIZE; count -= BUFFERSIZE)
randw(ifd, BUFFERSIZE, ofd);
if (read(ifd, buf, (int)count) != (int)count)
panic("Read error.");
if (write(ofd, buf, (int)count) != (int)count)
panic("Write error.");
}
/*
* Write single byte to file
*/
emit(c, fd)
int c;
int fd;
{
char cc;
cc = (char)c;
if (write(fd, &cc, 1) != 1)
panic("Emit write error.");
}