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https://github.com/fluencelabs/musl
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1cd417bdf1
based on a patch by orc. POSIX actually fails to specify the format of the ntop conversion; presumably, any output that will correctly round-trip back via the (well-specified) pton operation is acceptable. the new behavior is much more convenient than the old, however. this patch also affects getnameinfo, which is implemented in terms of inet_ntop and which is the preferred interface for performing this conversion. I've also removed some inexplicable cruft (filling the buffer with 'x' before doing anything) whose origin I was unable to track down.
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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const char *inet_ntop(int af, const void *restrict a0, char *restrict s, socklen_t l)
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{
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const unsigned char *a = a0;
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int i, j, max, best;
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char buf[100];
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switch (af) {
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case AF_INET:
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if (snprintf(s, l, "%d.%d.%d.%d", a[0],a[1],a[2],a[3]) < l)
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return s;
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break;
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case AF_INET6:
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if (memcmp(a, "\0\0\0\0\0\0\0\0\0\0\377\377", 12))
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snprintf(buf, sizeof buf,
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"%x:%x:%x:%x:%x:%x:%x:%x",
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256*a[0]+a[1],256*a[2]+a[3],
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256*a[4]+a[5],256*a[6]+a[7],
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256*a[8]+a[9],256*a[10]+a[11],
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256*a[12]+a[13],256*a[14]+a[15]);
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else
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snprintf(buf, sizeof buf,
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"%x:%x:%x:%x:%x:%x:%d.%d.%d.%d",
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256*a[0]+a[1],256*a[2]+a[3],
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256*a[4]+a[5],256*a[6]+a[7],
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256*a[8]+a[9],256*a[10]+a[11],
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a[12],a[13],a[14],a[15]);
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/* Replace longest /(^0|:)[:0]{2,}/ with "::" */
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for (i=best=0, max=2; buf[i]; i++) {
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if (i && buf[i] != ':') continue;
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j = strspn(buf+i, ":0");
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if (j>max) best=i, max=j;
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}
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if (max>2) {
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buf[best] = buf[best+1] = ':';
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strcpy(buf+best+2, buf+best+max);
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}
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if (strlen(buf) < l) {
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strcpy(s, buf);
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return s;
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}
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break;
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default:
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errno = EAFNOSUPPORT;
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return 0;
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}
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errno = ENOSPC;
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return 0;
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}
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