From 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sat, 12 Feb 2011 00:22:29 -0500 Subject: initial check-in, version 0.5.0 --- src/network/inet_ntop.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 src/network/inet_ntop.c (limited to 'src/network/inet_ntop.c') diff --git a/src/network/inet_ntop.c b/src/network/inet_ntop.c new file mode 100644 index 00000000..3e8a6db0 --- /dev/null +++ b/src/network/inet_ntop.c @@ -0,0 +1,48 @@ +#include +#include +#include +#include +#include +#include +#include + +const char *inet_ntop(int af, const void *a0, char *s, socklen_t l) +{ + const unsigned char *a = a0; + int i, j, max, best; + char buf[100]; + + switch (af) { + case AF_INET: + if (snprintf(s, l, "%d.%d.%d.%d", a[0],a[1],a[2],a[3]) < l) + return s; + break; + case AF_INET6: + memset(buf, 'x', sizeof buf); + buf[sizeof buf-1]=0; + snprintf(buf, sizeof buf, + "%.0x%x:%.0x%x:%.0x%x:%.0x%x:%.0x%x:%.0x%x:%.0x%x:%.0x%x", + a[0],a[1],a[2],a[3],a[4],a[5],a[6],a[7], + a[8],a[9],a[10],a[11],a[12],a[13],a[14],a[15]); + /* Replace longest /(^0|:)[:0]{2,}/ with "::" */ + for (i=best=0, max=2; buf[i]; i++) { + if (i && buf[i] != ':') continue; + j = strspn(buf+i, ":0"); + if (j>max) best=i, max=j; + } + if (max>2) { + buf[best] = buf[best+1] = ':'; + strcpy(buf+best+2, buf+best+max); + } + if (strlen(buf) < l) { + strcpy(s, buf); + return s; + } + break; + default: + errno = EAFNOSUPPORT; + return 0; + } + errno = ENOSPC; + return 0; +} -- cgit v1.2.1