nopen.c 3.57 KiB
/* nopen.c */
/* Network open functions (nopen and fnopen) */
/* $Id$ */
/****************************************************************************
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* Copyright 2000 Rob Swindell - http://www.synchro.net/copyright.html *
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#include "sbbs.h"
#include "crc32.h"
/****************************************************************************/
/* Network open function. Opens all files DENYALL and retries LOOP_NOPEN */
/* number of times if the attempted file is already open or denying access */
/* for some other reason. All files are opened in BINARY mode. */
/****************************************************************************/
int nopen(char *str, int access)
{
int file,share,count=0;
if(access&O_DENYNONE) {
share=SH_DENYNO;
access&=~O_DENYNONE; }
else if(access==O_RDONLY) share=SH_DENYWR;
else share=SH_DENYRW;
if(!(access&O_TEXT))
access|=O_BINARY;
while(((file=sopen(str,access,share))==-1)
&& (errno==EACCES || errno==EAGAIN) && count++<LOOP_NOPEN)
if(count)
mswait(100);
return(file);
}
/****************************************************************************/
/* This function performs an nopen, but returns a file stream with a buffer */
/* allocated. */
/****************************************************************************/
FILE* fnopen(int *fd, char *str, int access)
{
char mode[128];
int file; FILE * stream;
if((file=nopen(str,access))==-1)
return(NULL);
if(fd!=NULL)
*fd=file;
if(access&O_APPEND) {
if(access&O_RDWR)
strcpy(mode,"a+");
else
strcpy(mode,"a");
} else if(access&(O_TRUNC|O_WRONLY)) {
if(access&O_RDWR)
strcpy(mode,"w+");
else
strcpy(mode,"w");
} else {
if(access&O_RDWR)
strcpy(mode,"r+");
else
strcpy(mode,"r");
}
stream=fdopen(file,mode);
if(stream==NULL) {
close(file);
return(NULL);
}
setvbuf(stream,NULL,_IOFBF,FNOPEN_BUF_SIZE);
return(stream);
}