WSJT-X/lib/ptt.c

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#include <windows.h>
#include <stdio.h>
int ptt_(int *nport, int *ntx, int *iptt)
{
static HANDLE hFile;
static int open=0;
char s[10];
int i3=1,i4=1,i5=1,i6=1,i9=1,i00=1;
if(*nport==0) {
*iptt=*ntx;
return(0);
}
if(*ntx && (!open)) {
sprintf(s,"\\\\.\\COM%d",*nport);
hFile=CreateFile(TEXT(s),GENERIC_WRITE,0,NULL,OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,NULL);
if(hFile==INVALID_HANDLE_VALUE) {
// printf("PTT: Cannot open COM port %d.\n",*nport);
return 1;
}
open=1;
}
if(*ntx && open) {
i3=EscapeCommFunction(hFile,3);
i5=EscapeCommFunction(hFile,5);
*iptt=1;
}
else {
i4=EscapeCommFunction(hFile,4);
i6=EscapeCommFunction(hFile,6);
i9=EscapeCommFunction(hFile,9);
i00=CloseHandle(hFile);
*iptt=0;
open=0;
}
/*
if(i3==0) return 3;
if(i4==0) return 4;
if(i5==0) return 5;
if(i6==0) return 6;
if(i9==0) return 9;
if(i00==0) return 10;
*/
return 0;
}