eipconvtest.c - vx32 - Local 9vx git repository for patches.
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---
eipconvtest.c (3135B)
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1 #include <u.h>
2 #include <libc.h>
3
4 enum
5 {
6 Isprefix= 16,
7 };
8
9 uchar prefixvals[256] =
10 {
11 [0x00] 0 | Isprefix,
12 [0x80] 1 | Isprefix,
13 [0xC0] 2 | Isprefix,
14 [0xE0] 3 | Isprefix,
15 [0xF0] 4 | Isprefix,
16 [0xF8] 5 | Isprefix,
17 [0xFC] 6 | Isprefix,
18 [0xFE] 7 | Isprefix,
19 [0xFF] 8 | Isprefix,
20 };
21
22 uchar v4prefix[16] = {
23 0, 0, 0, 0,
24 0, 0, 0, 0,
25 0, 0, 0xff, 0xff,
26 0, 0, 0, 0
27 };
28
29 void
30 hnputl(void *p, ulong v)
31 {
32 uchar *a;
33
34 a = p;
35 a[0] = v>>24;
36 a[1] = v>>16;
37 a[2] = v>>8;
38 a[3] = v;
39 }
40
41 int
42 eipconv(va_list *arg, Fconv *f)
43 {
44 char buf[8*5];
45 static char *efmt = "%.2lux%.2lux%.2lux%.2lux%.2lux%.2lux";
46 static char *ifmt = "%d.%d.%d.%d";
47 uchar *p, ip[16];
48 ulong *lp;
49 ushort s;
50 int i, j, n, eln, eli;
51
52 switch(f->chr) {
53 case 'E': /* Ethernet address */
54 p = va_arg(*arg, uchar*);
55 sprint(buf, efmt, p[0], p[1], p[2], p[3], p[4], p[5]);
56 break;
57 case 'I': /* Ip address */
58 p = va_arg(*arg, uchar*);
59 common:
60 if(memcmp(p, v4prefix, 12) == 0)
61 sprint(buf, ifmt, p[12], p[13], p[14], p[15]);
62 else {
63 /* find longest elision */
64 eln = eli = -1;
65 for(i = 0; i < 16; i += 2){
66 for(j = i; j < 16; j += 2)
67 if(p[j] != 0 || p[j+1] != 0)
68 break;
69 if(j > i && j - i > eln){
70 eli = i;
71 eln = j - i;
72 }
73 }
74
75 /* print with possible elision */
76 n = 0;
77 for(i = 0; i < 16; i += 2){
78 if(i == eli){
79 n += sprint(buf+n, "::");
80 i += eln;
81 if(i >= 16)
82 break;
83 } else if(i != 0)
84 n += sprint(buf+n, ":");
85 s = (p[i]<<8) + p[i+1];
86 n += sprint(buf+n, "%ux", s);
87 }
88 }
89 break;
90 case 'i': /* v6 address as 4 longs */
91 lp = va_arg(*arg, ulong*);
92 for(i = 0; i < 4; i++)
93 hnputl(ip+4*i, *lp++);
94 p = ip;
95 goto common;
96 case 'V': /* v4 ip address */
97 p = va_arg(*arg, uchar*);
98 sprint(buf, ifmt, p[0], p[1], p[2], p[3]);
99 break;
100 case 'M': /* ip mask */
101 p = va_arg(*arg, uchar*);
102
103 /* look for a prefix mask */
104 for(i = 0; i < 16; i++)
105 if(p[i] != 0xff)
106 break;
107 if(i < 16){
108 if((prefixvals[p[i]] & Isprefix) == 0)
109 goto common;
110 for(j = i+1; j < 16; j++)
111 if(p[j] != 0)
112 goto common;
113 n = 8*i + (prefixvals[p[i]] & ~Isprefix);
114 } else
115 n = 8*16;
116
117 /* got one, use /xx format */
118 sprint(buf, "/%d", n);
119 break;
120 default:
121 strcpy(buf, "(eipconv)");
122 }
123 strconv(buf, f);
124 return sizeof(uchar*);
125 }
126
127 uchar testvec[11][16] =
128 {
129 { 0,0,0,0, 0,0,0,0, 0,0,0xff,0xff, 1,3,4,5, },
130 { 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, },
131 { 0xff,0xff,0x80,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, },
132 { 0xff,0xff,0xff,0xc0, 0,0,0,0, 0,0,0,0, 0,0,0,0, },
133 { 0xff,0xff,0xff,0xff, 0xe0,0,0,0, 0,0,0,0, 0,0,0,0, },
134 { 0xff,0xff,0xff,0xff, 0xff,0xf0,0,0, 0,0,0,0, 0,0,0,0, },
135 { 0xff,0xff,0xff,0xff, 0xff,0xff,0xf8,0, 0,0,0,0, 0,0,0,0, },
136 { 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, },
137 { 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, },
138 { 0,0,0,0, 0,0x11,0,0, 0,0,0,0, 0,0,0,0, },
139 { 0,0,0,0x11, 0,0,0,0, 0,0,0,0, 0,0,0,0x12, },
140 };
141
142 void
143 main(void)
144 {
145 int i;
146
147 fmtinstall('I', eipconv);
148 fmtinstall('M', eipconv);
149 for(i = 0; i < 11; i++)
150 print("%I\n%M\n", testvec[i], testvec[i]);
151 exits(0);
152 }