119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <lib9.h>
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#include <ip.h>
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enum
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{
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Isprefix= 16,
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};
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unsigned char prefixvals[256] =
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{
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[0x00] 0 | Isprefix,
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[0x80] 1 | Isprefix,
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[0xC0] 2 | Isprefix,
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[0xE0] 3 | Isprefix,
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[0xF0] 4 | Isprefix,
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[0xF8] 5 | Isprefix,
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[0xFC] 6 | Isprefix,
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[0xFE] 7 | Isprefix,
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[0xFF] 8 | Isprefix,
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};
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int
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eipfmt(Fmt *f)
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{
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char buf[5*8];
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static char *efmt = "%.2ux%.2ux%.2ux%.2ux%.2ux%.2ux";
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static char *ifmt = "%d.%d.%d.%d";
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uint8_t *p, ip[16];
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uint32_t *lp;
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uint16_t s;
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int i, j, n, eln, eli;
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switch(f->r) {
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case 'E': /* Ethernet address */
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p = va_arg(f->args, uint8_t*);
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snprint(buf, sizeof buf, efmt, p[0], p[1], p[2], p[3], p[4], p[5]);
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return fmtstrcpy(f, buf);
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case 'I': /* Ip address */
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p = va_arg(f->args, uint8_t*);
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common:
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if(memcmp(p, v4prefix, 12) == 0){
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snprint(buf, sizeof buf, ifmt, p[12], p[13], p[14], p[15]);
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return fmtstrcpy(f, buf);
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}
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/* find longest elision */
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eln = eli = -1;
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for(i = 0; i < 16; i += 2){
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for(j = i; j < 16; j += 2)
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if(p[j] != 0 || p[j+1] != 0)
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break;
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if(j > i && j - i > eln){
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eli = i;
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eln = j - i;
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}
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}
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/* print with possible elision */
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n = 0;
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for(i = 0; i < 16; i += 2){
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if(i == eli){
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n += sprint(buf+n, "::");
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i += eln;
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if(i >= 16)
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break;
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} else if(i != 0)
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n += sprint(buf+n, ":");
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s = (p[i]<<8) + p[i+1];
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n += sprint(buf+n, "%ux", s);
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}
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return fmtstrcpy(f, buf);
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case 'i': /* v6 address as 4 longs */
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lp = va_arg(f->args, uint32_t*);
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for(i = 0; i < 4; i++)
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hnputl(ip+4*i, *lp++);
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p = ip;
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goto common;
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case 'V': /* v4 ip address */
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p = va_arg(f->args, uint8_t*);
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snprint(buf, sizeof buf, ifmt, p[0], p[1], p[2], p[3]);
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return fmtstrcpy(f, buf);
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case 'M': /* ip mask */
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p = va_arg(f->args, uint8_t*);
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/* look for a prefix mask */
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for(i = 0; i < 16; i++)
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if(p[i] != 0xff)
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break;
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if(i < 16){
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if((prefixvals[p[i]] & Isprefix) == 0)
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goto common;
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for(j = i+1; j < 16; j++)
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if(p[j] != 0)
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goto common;
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n = 8*i + (prefixvals[p[i]] & ~Isprefix);
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} else
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n = 8*16;
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/* got one, use /xx format */
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snprint(buf, sizeof buf, "/%d", n);
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return fmtstrcpy(f, buf);
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}
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return fmtstrcpy(f, "(eipfmt)");
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}
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