swrite.c

来自「Porting the Simple Sockets Library Dr. C」· C语言 代码 · 共 50 行

/* Swrite.c: this file contains the Swrite() function */
#include <stdio.h>
#include "sockets.h"

/* Swrite: this function performs a socket write of a string.
 *  It will write out the requested bytes (up to a null byte),
 *  even if the socket buffer is full.
 *
 *  If the write fails, it will return the negative of the number
 *  of bytes actually transmitted.  Otherwise, it will return the
 *  number of bytes transmitted, which ought to be the same as buflen
 *  if life is just.
 */
#ifdef __PROTOTYPE__
int Swrite(
  Socket *skt,		/* socket handle			*/
  void   *buf,		/* socket character buffer	*/
  int     buflen)	/* length of buffer			*/
#else
int Swrite(
  skt,				/* socket handle			*/
  buf,				/* socket character buffer	*/
  buflen)			/* length of buffer			*/
Socket *skt;
void   *buf;
int     buflen;
#endif
{
int cnt;
int wcnt;


/* sanity check */
if(!skt) {
	return -1;
	}

/* write buflen bytes, no matter the wait */
for(cnt= 0; cnt < buflen; cnt+= wcnt) {
	wcnt= send(skt->skt,(void *) (((char *) buf)+cnt),(unsigned) (buflen-cnt),0);
	if(wcnt < 0) {
		return cnt;
		}
	}

return cnt;
}

/* --------------------------------------------------------------------- */