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101 lines
1.7 KiB
101 lines
1.7 KiB
4 months ago
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include "utils.h"
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static __inline__ u_int16_t dn_ntohs(u_int16_t addr)
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{
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union {
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u_int8_t byte[2];
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u_int16_t word;
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} u;
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u.word = addr;
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return ((u_int16_t)u.byte[0]) | (((u_int16_t)u.byte[1]) << 8);
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}
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static __inline__ int do_digit(char *str, u_int16_t *addr, u_int16_t scale, size_t *pos, size_t len, int *started)
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{
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u_int16_t tmp = *addr / scale;
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if (*pos == len)
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return 1;
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if (((tmp) > 0) || *started || (scale == 1)) {
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*str = tmp + '0';
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*started = 1;
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(*pos)++;
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*addr -= (tmp * scale);
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}
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return 0;
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}
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static const char *dnet_ntop1(const struct dn_naddr *dna, char *str, size_t len)
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{
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u_int16_t addr, area;
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size_t pos = 0;
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int started = 0;
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memcpy(&addr, dna->a_addr, sizeof(addr));
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addr = dn_ntohs(addr);
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area = addr >> 10;
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if (dna->a_len != 2)
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return NULL;
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addr &= 0x03ff;
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if (len == 0)
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return str;
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if (do_digit(str + pos, &area, 10, &pos, len, &started))
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return str;
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if (do_digit(str + pos, &area, 1, &pos, len, &started))
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return str;
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if (pos == len)
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return str;
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*(str + pos) = '.';
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pos++;
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started = 0;
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if (do_digit(str + pos, &addr, 1000, &pos, len, &started))
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return str;
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if (do_digit(str + pos, &addr, 100, &pos, len, &started))
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return str;
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if (do_digit(str + pos, &addr, 10, &pos, len, &started))
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return str;
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if (do_digit(str + pos, &addr, 1, &pos, len, &started))
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return str;
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if (pos == len)
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return str;
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*(str + pos) = 0;
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return str;
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}
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const char *dnet_ntop(int af, const void *addr, char *str, size_t len)
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{
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switch(af) {
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case AF_DECnet:
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errno = 0;
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return dnet_ntop1((struct dn_naddr *)addr, str, len);
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default:
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errno = EAFNOSUPPORT;
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}
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return NULL;
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}
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