WSJT-X/libm65/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=0,i4=0,i5=0,i6=0,i9=0,i00=0;
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) {
EscapeCommFunction(hFile,3);
EscapeCommFunction(hFile,5);
*iptt=1;
}
else {
EscapeCommFunction(hFile,4);
EscapeCommFunction(hFile,6);
EscapeCommFunction(hFile,9);
i00=CloseHandle(hFile);
*iptt=0;
open=0;
}
if((i00+i3+i4+i5+i6+i9)==-99) return -1; //Silence compiler warning
return 0;
}