int
xtoi(char *s)
{
char d1, d2;
int ret = 0;
if(isxdigit(*s)) {
d1 = *s++;
if(isxdigit(*s)) {
d2 = *s++;
ret = (xdtoi(d1) * 16) + xdtoi(d2);
}
}
return(ret);
}
/*
* Convert 's', which can have the one of the forms:
*
* "xx:xx:xx:xx:xx:xx"
* "xx.xx.xx.xx.xx.xx"
* "xx-xx-xx-xx-xx-xx"
* "xxxx.xxxx.xxxx"
* "xxxxxxxxxxxx"
*
* (or various mixes of ':', '.', and '-') into a new
* ethernet address. Assumes 's' is well formed.
*/
u_char *
pcap_ether_aton(const char *s)
{
register u_char *ep, *e;
register u_char d;
e = ep = (u_char *)malloc(6);
if (e == NULL)
return (NULL);
while (*s) {
if (*s == ':' || *s == '.' || *s == '-')
s += 1;
d = xdtoi(*s++);
if (isxdigit((unsigned char)*s)) {
d <<= 4;
d |= xdtoi(*s++);
}
*ep++ = d;
}
return (e);
}
struct pcap_etherent *
pcap_next_etherent(FILE *fp)
{
register int c, i;
u_char d;
char *bp;
size_t namesize;
static struct pcap_etherent e;
memset((char *)&e, 0, sizeof(e));
for (;;) {
/* Find addr */
c = skip_space(fp);
if (c == EOF)
return (NULL);
if (c == '\n')
continue;
/* If this is a comment, or first thing on line
cannot be Ethernet address, skip the line. */
if (!isxdigit(c)) {
c = skip_line(fp);
if (c == EOF)
return (NULL);
continue;
}
/* must be the start of an address */
for (i = 0; i < 6; i += 1) {
d = xdtoi((u_char)c);
c = getc(fp);
if (c == EOF)
return (NULL);
if (isxdigit(c)) {
d <<= 4;
d |= xdtoi((u_char)c);
c = getc(fp);
if (c == EOF)
return (NULL);
}
e.addr[i] = d;
if (c != ':')
break;
c = getc(fp);
if (c == EOF)
return (NULL);
}
/* Must be whitespace */
if (!isspace(c)) {
c = skip_line(fp);
if (c == EOF)
return (NULL);
continue;
}
c = skip_space(fp);
if (c == EOF)
return (NULL);
/* hit end of line... */
if (c == '\n')
continue;
if (c == '#') {
c = skip_line(fp);
if (c == EOF)
return (NULL);
continue;
}
/* pick up name */
bp = e.name;
/* Use 'namesize' to prevent buffer overflow. */
namesize = sizeof(e.name) - 1;
do {
*bp++ = (u_char)c;
c = getc(fp);
if (c == EOF)
return (NULL);
} while (!isspace(c) && --namesize != 0);
*bp = '\0';
/* Eat trailing junk */
if (c != '\n')
(void)skip_line(fp);
return &e;
}
}
