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SGI Freeware 1998 June
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SGI Freeware 1998 June.iso
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fw_UMINNgopher.idb
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usr
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src
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gopher_1.12
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object
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util.c.z
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util.c
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C/C++ Source or Header
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1997-09-09
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11KB
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514 lines
/********************************************************************
* $Author: drich $
* $Revision: 1.1 $
* $Date: 1995/10/03 04:09:59 $
* $Source: /proj/freeware1.0/gopher1.12/src/object/RCS/util.c,v $
* $State: Exp $
*
* Paul Lindner, University of Minnesota CIS.
*
* Copyright 1991, 1992 by the Regents of the University of Minnesota
* see the file "Copyright" in the distribution for conditions of use.
*********************************************************************
* MODULE: util.c
* Various useful utilities for gopher clients and servers
*********************************************************************
* Revision History:
* $Log: util.c,v $
* Revision 1.1 1995/10/03 04:09:59 drich
* gopher 1.2 check-in
*
* Revision 2.4 1993/01/12 21:12:23 lindner
* Reverted to old readfield behavior() \n is now ignored again.
*
* Revision 2.3 1993/01/08 23:29:21 lindner
* More mods from jqj.
*
* Revision 2.2 1992/12/31 04:58:41 lindner
* merged 1.1.1.1 and 2.1
*
* Revision 2.1 1992/12/21 19:41:14 lindner
* Added check for null in writestring
* Added function skip_whitespace
*
* Revision 1.1.1.1 1992/12/31 04:52:01 lindner
* Changes for VMS
*
* Revision 1.1 1992/12/10 23:27:52 lindner
* gopher 1.1 release
*
*
*********************************************************************/
#include "Malloc.h"
#include "String.h"
#include <ctype.h>
#include "boolean.h"
#include "util.h"
#if defined(VMS) && defined(UCX)
#include <errno.h>
#endif
#if defined(VMS) && (defined(WOLLONGONG) || defined(MULTINET))
/* Multinet and Wollongong (non UCX-emulation) use channel numbers */
/* for sockets, which are small multiples of 16. The first 5 */
/* channels can be assumed to be already used, so we assume that */
/* sockets start at 64, and that only 64 VAXC fds are simultaneously */
/* open in the program. Actually, the first socket is likely to be */
/* more like 176! */
#define IS_SOCKET(s) ((s)>=64)
/* Close a socket.
* Note that in old Wollongong and Multinet implementations close()
* works only on fds, not sockets.
* For UCX and Unix, closenet() is #defined to be close()
*/
int closenet(s)
int s;
{
if (IS_SOCKET(s)) {
#ifdef MULTINET
return (socket_close(s));
#else /* WOLLONGONG */
return (netclose(s));
#endif
}
else
close(s); /* shouldn't be calling this routine */
}
#endif /* WOLLANGONG or MULTINET */
/* Read "n" bytes from a descriptor.
* Use in place of read() when fd is a stream socket
*
* Returns the number of total bytes read.
*/
int readn(fd, ptr, nbytes)
int fd;
char *ptr;
int nbytes;
{
int nleft, nread;
nleft = nbytes;
while (nleft > 0) {
#if defined(VMS) && defined(WOLLONGONG)
nread = IS_SOCKET(fd) ? netread(fd, ptr, nleft) : read(fd, ptr, nleft);
#else
#if defined(VMS) && defined(MULTINET)
nread = IS_SOCKET(fd) ? socket_read(fd, ptr, nleft) : read(fd, ptr, nleft);
#else
nread = read(fd, ptr, nleft);
#endif
#endif
#if defined(VMS) && defined(UCX)
if (nread < 0 && errno == EPIPE)
break;
#endif
if (nread < 0)
return(nread); /* error, return <0 */
else if (nread == 0) /* EOF */
break;
nleft -= nread;
ptr += nread;
}
return(nbytes - nleft); /* return >= 0) */
}
/*
* Write "n" bytes to a descriptor.
* Use in place of write() when fd is a stream socket
*
* We return the number of bytes written
*/
int
writen(fd, ptr, nbytes)
int fd;
char *ptr;
int nbytes;
{
int nleft, nwritten;
nleft = nbytes;
while(nleft > 0) {
#if defined(VMS) && defined(WOLLONGONG)
nwritten = IS_SOCKET(fd) ? netwrite(fd, ptr, nleft) : write(fd, ptr, nleft);
#else
#if defined(VMS) && defined(MULTINET)
nwritten = IS_SOCKET(fd) ? socket_write(fd, ptr, nleft) : write(fd, ptr, nleft);
#else
nwritten = write(fd, ptr, nleft);
#endif
#endif
if (nwritten <= 0)
return(nwritten); /* error */
nleft -= nwritten;
ptr += nwritten;
}
return(nbytes - nleft);
}
/*
* Writestring uses the writen and strlen calls to write a
* string to the file descriptor fd. If the write fails
* a -1 is returned. Otherwise zero is returned.
*/
int writestring(fd, stringptr)
int fd;
char *stringptr;
{
int length;
if (stringptr == NULL)
return(0);
length = strlen(stringptr);
if (writen(fd, stringptr, length) != length) {
return(-1);
}
else
return(0);
}
/*
* Read from the socket into a buffer. Mucho more efficent in terms of
* system calls..
*/
#define RECVSIZE 4096
static int readrecvbuf(sockfd, buf, len)
int sockfd;
char *buf;
int len;
{
static char recvbuf[RECVSIZE];
static int recvbufptr = 0;
static int recvbufsize = 0;
static int Oldsockfd = 0;
int bytesread = 0;
if (recvbufptr == 0 || Oldsockfd != sockfd) {
#if defined(VMS) && defined(WOLLONGONG)
recvbufsize = IS_SOCKET(sockfd) ?
netread(sockfd, recvbuf, RECVSIZE) : read(sockfd, recvbuf, RECVSIZE);
#else
#if defined(VMS) && defined(MULTINET)
recvbufsize = IS_SOCKET(sockfd) ?
socket_read(sockfd, recvbuf, RECVSIZE) : read(sockfd, recvbuf, RECVSIZE);
#else
recvbufsize = read(sockfd, recvbuf, RECVSIZE);
#endif
#endif
Oldsockfd = sockfd;
recvbufptr = 0;
if (recvbufsize == 0)
return(0);
#if defined(VMS) && defined(UCX)
if (recvbufsize < 0 && errno == EPIPE)
return(0);
#endif
}
while (len--) {
*buf++ = recvbuf[recvbufptr++];
bytesread++;
if (recvbufptr == recvbufsize && len != 0) {
recvbufsize = readn(sockfd, recvbuf, RECVSIZE);
recvbufptr = 0;
if (recvbufsize == 0)
return(bytesread);
if (recvbufsize < 0)
return(recvbufsize);
} else if (recvbufptr >= recvbufsize)
recvbufptr = 0;
}
return(bytesread);
}
/*
* Read a line from a descriptor. Read the line one byte at a time,
* looking for the newline. We store the newline in the buffer,
* then follow it with a null (the same as fgets(3)).
* We return the number of characters up to, but not including,
* the null (the same as strlen(3))
*/
int readline(fd, ptr, maxlen)
int fd;
char *ptr;
int maxlen;
{
int n;
int rc;
char c;
for (n=1; n < maxlen; n++) {
if ( (rc = readrecvbuf(fd, &c, 1)) == 1) {
*ptr++ = c;
if (c == '\n')
break;
}
else if (rc == 0) {
if (n == 1)
return(0); /* EOF, no data read */
else
break; /* EOF, some data was read */
}
else
return(-1); /* error */
}
*ptr = 0; /* Tack a NULL on the end */
return(n);
}
/*
* Readfield reads data up to a tab, (like readline above)
*/
int
readfield(fd, ptr, maxlen)
int fd;
char *ptr;
int maxlen;
{
int n;
int rc;
char c;
for (n=1; n < maxlen; n++) {
if ( (rc = readrecvbuf(fd, &c, 1)) == 1) {
*ptr++ = c;
if (c == '\t') {
*(ptr - 1) = '\0';
break;
}
}
else if (rc == 0) {
if (n == 1)
return(0); /* EOF, no data read */
else
break; /* EOF, some data was read */
}
else
return(-1); /* error */
}
*ptr = 0; /* Tack a NULL on the end */
return(n);
}
int
sreadword(input, output, maxlen)
char *input;
char *output;
int maxlen;
{
int n;
char c;
for (n=0; n < maxlen; n++) {
c = *input++;
*output++ = c;
if (isspace(c)) {
*(output - 1) = '\0';
break;
}
if (c == '\0') {
break;
}
}
*output = '\0'; /* Tack a NULL on the end */
return(n);
}
/*
* ZapCRLF removes all carriage returns and linefeeds from a C-string.
*/
void
ZapCRLF(inputline)
char *inputline;
{
char *cp;
cp = strchr(inputline, '\r'); /* Zap CR-LF */
if (cp != NULL)
*cp = '\0';
else {
cp = strchr(inputline, '\n');
if (cp != NULL)
*cp = '\0';
}
}
/*
* Utilities for dealing with HTML junk
*/
static boolean acceptable[256];
static boolean acceptable_inited = FALSE;
void init_acceptable()
{
unsigned int i;
char * good =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789./-_$";
for(i=0; i<256; i++) acceptable[i] = FALSE;
for(;*good; good++) acceptable[(unsigned int)*good] = TRUE;
acceptable_inited = TRUE;
}
static char hex[17] = "0123456789abcdef";
char from_hex(c)
char c;
{
return (c>='0')&&(c<='9') ? c-'0'
: (c>='A')&&(c<='F') ? c-'A'+10
: (c>='a')&&(c<='f') ? c-'a'+10
: 0;
}
/*
* Finds out if a character is printable & non white space.
* if it is, then return a hex encoding of the char,
* otherwise, just return a reference to the character
*/
char *to_hex(c)
char c;
{
static char out[4];
if (acceptable_inited == FALSE)
init_acceptable();
out[0] = '\0';
if (acceptable[(int)c] == TRUE) {
out[0] = c;
out[1] = '\0';
}
else {
out[0]='%';
out[1]=hex[c >> 4];
out[2]=hex[c & 15];
out[3]='\0';
}
return(out);
}
/*
* Replace hex escape sequences with the proper codes...
*
* input and output can be the same if you want
*/
void
Fromhexstr(input, output)
char *input, *output;
{
char c;
unsigned int b;
while (*input) {
if (*input == '%') {
input++;
c = *input++;
b = from_hex(c);
c = *input++;
if (!c) break;
*output++ = (b<<4) + from_hex(c);
}
else
*output++ = *input++;
}
*output = '\0';
}
void
Tohexstr(input, output)
char *input, *output;
{
if (acceptable_inited == FALSE)
init_acceptable();
while (*input) {
if (acceptable[(int)*input] == TRUE) {
*output++ = *input++;
}
else {
*output++ = '%';
*output++ = hex[*input >> 4];
*output++ = hex[*input & 15];
input++;
}
}
*output = '\0';
}
/*
* String insensitive strstr
*/
char *
strcasestr(inputline, match)
char *inputline;
char *match;
{
int matchlen=0;
int i, inlen;
matchlen = strlen(match);
inlen = strlen(inputline);
for(i=0; i<inlen; i++) {
if (strncasecmp(inputline+i, match, matchlen)==0)
return(inputline+i);
}
return(NULL);
}
/*
* Iterate over a string, return a pointer to the next character
* that isn't whitespace.
*/
char *
skip_whitespace(str)
char *str;
{
while (isspace(*str) && *str!='\0')
str++;
return(str);
}