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Rework of the -i feature

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This version detects IPv6 address in the host field
and also IPv6 link interface separated by % sign.
It also handles unprintable characters and spaces better
than the previous one.

Signed-off-by: Craig Small <csmall@enc.com.au>
This commit is contained in:
Jaromir Capik 2012-06-20 22:19:14 +10:00 committed by Craig Small
parent 1d899453da
commit dcd8cf0b4b
1 changed files with 54 additions and 22 deletions
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76
w.c
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@ -103,35 +103,67 @@ static void print_host(const char *restrict host, int len, const int fromlen)
}
/* This routine prints the display part of the host */
static void print_display(const char *restrict host, int len, int restlen)
/* This routine prints the display part of the host or IPv6 link address interface */
static void print_display_or_interface(const char *restrict host, int len, int restlen)
{
char *disp;
char *disp,*tmp;
if (restlen <= 0) return; /* not enough space for the display */
if (restlen <= 0) return; /* not enough space for printing anything */
/* search for the display (collon) */
/* search for a collon (might be a display) */
disp = (char *)host;
while ( (disp < (host + len)) && (*disp != ':') && (*disp != '\0') ) disp++;
while ( (disp < (host + len)) && (*disp != ':') && isprint(*disp) ) disp++;
/* number of chars till the end of the input field */
len -= (disp - host);
/* if it is still longer than the rest of the output field, then cut it */
if (len > restlen) len = restlen;
/* display found, print it */
/* colon found */
if (*disp == ':') {
while ((len > 0) && (*disp != '\0')) {
len--; restlen--;
/* print only if printable and non-space */
if (isprint(*host) && *host != ' ') {
/* detect multiple colons -> IPv6 in the host (not a display) */
tmp = disp+1;
while ( (tmp < (host + len)) && (*tmp != ':') && isprint(*tmp) ) tmp++;
if (*tmp != ':') { /* multiple colons not found - it's a display */
/* number of chars till the end of the input field */
len -= (disp - host);
/* if it is still longer than the rest of the output field, then cut it */
if (len > restlen) len = restlen;
/* print the display */
while ((len > 0) && isprint(*disp) && (*disp != ' ')) {
len--; restlen--;
fputc(*disp, stdout);
disp++;
} else { /* space or nonprintable - replace with dash and stop printing */
fputc('-', stdout);
break;
}
if ((len > 0) && (*disp != '\0')) { /* space or nonprintable found - replace with dash and stop printing */
restlen--;
fputc('-', stdout);
}
} else { /* multiple colons found - it's an IPv6 address */
/* search for % (interface separator in case of IPv6 link address) */
while ( (tmp < (host + len)) && (*tmp != '%') && isprint(*tmp) ) tmp++;
if (*tmp == '%') { /* interface separator found */
/* number of chars till the end of the input field */
len -= (tmp - host);
/* if it is still longer than the rest of the output field, then cut it */
if (len > restlen) len = restlen;
/* print the interface */
while ((len > 0) && isprint(*tmp) && (*tmp != ' ')) {
len--; restlen--;
fputc(*tmp, stdout);
tmp++;
}
if ((len > 0) && (*tmp != '\0')) { /* space or nonprintable found - replace with dash and stop printing */
restlen--;
fputc('-', stdout);
}
}
}
}
@ -177,8 +209,8 @@ static void print_from(const utmp_t *restrict const u, const int ip_addresses, c
len = strlen(buf);
if (len) { /* IP address is non-empty, print it (and concatenate with display, if present) */
fputs(buf, stdout);
/* show the display part of the host, if present */
print_display(u->ut_host, UT_HOSTSIZE, fromlen - len);
/* show the display part of the host or IPv6 link addr. interface, if present */
print_display_or_interface(u->ut_host, UT_HOSTSIZE, fromlen - len);
} else { /* IP address is empty, print the host instead */
print_host(u->ut_host, UT_HOSTSIZE, fromlen);
}