/* Sgets.c * * Syntax :  Sgets(buf,maxbuf,skt) * Returns: buf if it worked, a NULL pointer otherwise * * buf[maxbuf] */#include <stdio.h>#include "sockets.h"/* --------------------------------------------------------------------------- * Local Definitions: *//* --------------------------------------------------------------------------- * Function Declarations: *//* --------------------------------------------------------------------------- * Source Code: *//* Sgets: * Gets a null-byte terminated string from the specified Socket. * Note that the maxbuf *must be* >= 2 (one byte needed for the * null byte termination, and one byte for a minimal amount of data). * This function blocks and will fill the buffer "buf" with up * to maxbuf characters.  The output from this function will * be null byte terminated when successful, even on a full buffer condition. * * Returns: buf     : on success *          null ptr: on failure */#ifdef __PROTOTYPE__char *Sgets(  char   *buf,		/* holds null-byte terminated string from Socket	*/  int     maxbuf,	/* maximum size of string allowed in buf			*/  Socket *skt)		/* Socket from which data is to be read				*/#elsechar *Sgets(  buf,  maxbuf,  skt)char   *buf;int     maxbuf;Socket *skt;#endif{int   buflen;int   mesglen;char *b  = NULL;#ifndef SSLNOPEEKchar *nb = NULL;#endif/* error or whatever, until the buffer actually gets something its empty */buf[0]= '\0';/* sanity check */if(!skt) {	return (char *) NULL;	}#ifdef SSLNOPEEK	/* stupid, so it receives one byte at a time */for(b= buf, buflen= maxbuf-1; buflen; --buflen, ++b) {	if(recv(skt->skt,b,(unsigned) 1,0) <= 0) {		return (char *) NULL;		}	if(*b == '\0') break;	}#else/* receive bytes until a nullbyte is received */buflen       = maxbuf - 2;	/* leave space for trailing null byte			*/buf[buflen+1]= '\0';		/* so strchr will find a null byte somewhere	*/for(b= buf, mesglen= 0; buflen > 0; b+= mesglen, buflen-= mesglen) {	/* block until something shows up on the Socket */	if(!Swait(skt)) {    /* null == error - should be at least 1 null byte */		return (char *) NULL;		}	/* peek at contents of socket queue */	mesglen= recv(skt->skt,b,buflen,MSG_PEEK);	if(mesglen <= 0) {	/* socket error - bad receive */		return (char *) NULL;		}	else if(mesglen > 0) { /* check if null byte received yet */		nb= strchr(b,'\0');			/* find null byte in buffer				*/		if(nb < b + mesglen) {		/* null byte inside peeked-at message	*/			mesglen= nb - b + 1;	/* read up to and including null byte	*/			if(Sreadbytes(skt,b,mesglen) <= 0) {				return buf;				}			break;			}		else if(mesglen >= buflen) { /* whoops - full buffer				*/			if(Sreadbytes(skt,b,buflen) <= 0) {				return buf;				}			b[buflen]= '\0';		/* end-of-buffer termination			*/			break;			}		else if(Sreadbytes(skt,b,mesglen) <= 0) {	/* partial read			*/			return buf;			}		}	}#endif	/* #ifdef SSLNOPEEK ... #else ... #endif *//* return message */return buf;}/* --------------------------------------------------------------------- * vim: ts=4 */