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Cream of the Crop 1
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Cream of the Crop 1.iso
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PROGRAM
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PCCP024.ARJ
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XMCRCS.C
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1992-05-17
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/* Copyright (C) 1992 Peter Edward Cann, all rights reserved.
* MicroSoft QuickC
*/
#include<stdio.h>
#include<bios.h>
#include<dos.h>
#include<fcntl.h>
#include<sys\types.h>
#include<sys\stat.h>
#include<signal.h>
#include"port.h"
#define NAK 21
#define ACK 6
#define SOH 1
#define EOT 4
#define CAN 24
sendchar(c)
unsigned char c;
{
while(!((inp(basereg+STATREG)&TXMTMASK)&&(inp(basereg+MSTATREG)&CTSMASK)));
outp(basereg, c);
}
int follow;
int rcharto(ticks)
int ticks;
{
long tstamp, tstamp1, dayofticksp;
int c;
_bios_timeofday(_TIME_GETCLOCK, &tstamp);
dayofticksp=0;
while(1)
{
if(_bios_timeofday(_TIME_GETCLOCK, &tstamp1))
dayofticksp+=20*60*60*24;
if(tstamp1+dayofticksp-tstamp>ticks)
return(-1); /* NOTE: This is an INT!!! */
if(follow!=index)
{
c=buf[follow++];
follow=follow%TBUFSIZ;
return(c);
}
}
}
int calccrc(ptr, count)
char *ptr;
int count;
{
int crc, i;
crc = 0;
while(--count >= 0)
{
crc = crc ^ (int)*ptr++ << 8;
for(i = 0; i < 8; ++i)
if(crc & 0x8000)
crc = crc << 1 ^ 0x1021;
else
crc = crc << 1;
}
return (crc & 0xFFFF);
}
unsigned char block[128];
sblock(blockn)
int blockn;
{
unsigned char c;
unsigned short crc, rcrc;
int i;
crc=calccrc(block, 128);
sendchar(SOH);
sendchar(blockn);
sendchar((blockn^0xff)&0xff);
for(i=0;i<128;++i)
sendchar(block[i]);
sendchar((crc>>8)&0xff);
sendchar(crc&0xff);
}
quit()
{
cleanup();
exit(99);
}
main(argc, argv)
int argc;
char **argv;
{
int i, j, infd, ok, c;
unsigned char blocknum;
long nbytes;
index=follow=0;
printf("Copyright (C) 1992 Peter Edward Cann, all rights reserved.\n");
printf("xmodem crc send of %s.\n", argv[4]);
if(argc!=5)
{
printf("USAGE: xmodemr <comnum> <bps> <stopbits> <file pathname>\n");
exit(1);
}
if((infd=open(argv[4], O_RDONLY|O_BINARY))==-1)
{
printf("Error opening file %s.\n", argv[4]);
exit(2);
}
comnum=atoi(argv[1])-1;
speed=atoi(argv[2]);
databits='8';
parity='n';
stopbits=argv[3][0];
setport();
signal(SIGINT, quit);
readset();
setup();
nbytes=0;
if(rcharto(2000)!='C')
{
printf("Spurrious char or no C in 100 seconds.\n");
cleanup();
exit(10);
}
blocknum=1;
while(1)
{
if((j=read(infd, block, 128))==0)
{
printf("\nEnd of file.\n");
sendchar(EOT);
do
c=rcharto(300);
while((c!=ACK)&&(c!=NAK)&&(c!=CAN)&&(c!=-1));
if(c!=ACK)
{
printf("No ACK of EOT.\n");
cleanup();
exit(13);
}
else
{
printf("Successful.\n");
cleanup();
exit(0);
}
}
for(c=j;c<128;c++)
block[c]=26;
i=0;
do
{
printf("\nSending block %d. ", blocknum);
sblock(blocknum);
do
c=rcharto(200);
while((c!=ACK)&&(c!=NAK)&&(c!=CAN)&&(c!=-1));
}
while((c==NAK)&&(i++<10));
if(c!=ACK)
if(c==NAK)
{
printf("\nRetry limit exceeded.\n");
cleanup();
exit(14);
}
else
{
printf("\nSpurrious character hex %02x; ACK or NAK expected.\n", c);
cleanup();
exit(11);
}
nbytes+=128;
printf("Successful. Bytes so far: %ld", nbytes);
blocknum++;
}
printf("Programming error; fell through end; see code.\n");
cleanup();
exit(12);
}