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NETUSER.C
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C/C++ Source or Header
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1988-07-28
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3KB
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138 lines
/* Miscellaneous format conversion subroutines */
#include <ctype.h>
#include <stdio.h>
#include "global.h"
#include "netuser.h"
int net_error;
#define LINELEN 256
/* Convert Internet address in ascii dotted-decimal format (44.0.0.1) to
* binary IP address
*/
int32
aton(s)
register char *s;
{
int32 n;
int atoi();
register int i;
n = 0;
for(i=24;i>=0;i -= 8){
n |= (int32)atoi(s) << i;
if((s = index(s,'.')) == NULLCHAR)
break;
s++;
}
return n;
}
/* Resolve a host name into an IP address. IP addresses in dotted-decimal
* notation are distinguished from domain names by enclosing them in
* brackets, e.g., [44.64.0.1]
*/
int32
resolve(host)
char *host;
{
register char *cp,*cp1;
int i;
char hostent[LINELEN];
FILE *sfile;
if(*host == '['){
/* Brackets indicate IP address in dotted-decimal form */
return aton(host + 1);
}
/* Not a numerical IP address, search the host table */
if((sfile = fopen(hosts,"r")) == NULL){
return 0;
}
while (!feof(sfile)){
fgets(hostent,LINELEN,sfile);
rip(hostent);
cp = hostent;
if(*cp == '#' || !isdigit(*cp))
continue; /* Comment or invalid line */
while(cp != NULLCHAR){
/* Skip white space */
while(*cp == ' ' || *cp == '\t')
cp++;
if(*cp == '\0')
break;
/* Look for next token, find length of this one */
if((cp1 = index(cp,'\t')) != NULLCHAR){
i = cp1 - cp;
} else if((cp1 = index(cp,' ')) != NULLCHAR) {
i = cp1 - cp;
} else {
i = strlen(cp);
}
if(strlen(host) == i && strncmp(host,cp,i) == 0){
/* Found it */
fclose(sfile);
return aton(hostent);
}
/* That one didn't match, try the next one */
cp = cp1;
}
}
/* No address found */
fclose(sfile);
return 0;
}
/* Convert an internet address (in host byte order) to a dotted decimal ascii
* string, e.g., 255.255.255.255\0
*/
char *
inet_ntoa(a)
int32 a;
{
static char buf[16];
sprintf(buf,"%u.%u.%u.%u",
hibyte(hiword(a)),
lobyte(hiword(a)),
hibyte(loword(a)),
lobyte(loword(a)) );
return buf;
}
/* Convert a socket (address + port) to an ascii string of the form
* aaa.aaa.aaa.aaa:ppppp
*/
char *
psocket(s)
struct socket *s;
{
static char buf[30];
sprintf(buf,"%s:%u",inet_ntoa(s->address),s->port);
return buf;
}
/* Convert hex-ascii string to long integer */
long
htol(s)
char *s;
{
long ret;
char c;
ret = 0;
while((c = *s++) != '\0'){
#if ( !ATARI_ST && !LATTICE ) /* DG2KK "ik versta er heelemal niets van!"*/
c &= 0x7f;
#endif
if(c >= '0' && c <= '9')
ret = ret*16 + (c - '0');
else if(c >= 'a' && c <= 'f')
ret = ret*16 + (10 + c - 'a');
else if(c >= 'A' && c <= 'F')
ret = ret*16 + (10 + c - 'A');
else
break;
}
return ret;
}