Update trace logging

src/inet_ntop.c

@@ -0,0 +1,78 @@
+/**
+
+    musl libc
+
+musl, pronounced like the word "mussel", is an MIT-licensed
+implementation of the standard C library targetting the Linux syscall
+API, suitable for use in a wide range of deployment environments. musl
+offers efficient static and dynamic linking support, lightweight code
+and low runtime overhead, strong fail-safe guarantees under correct
+usage, and correctness in the sense of standards conformance and
+safety. musl is built on the principle that these goals are best
+achieved through simple code that is easy to understand and maintain.
+
+The 1.1 release series for musl features coverage for all interfaces
+defined in ISO C99 and POSIX 2008 base, along with a number of
+non-standardized interfaces for compatibility with Linux, BSD, and
+glibc functionality.
+
+For basic installation instructions, see the included INSTALL file.
+Information on full musl-targeted compiler toolchains, system
+bootstrapping, and Linux distributions built on musl can be found on
+the project website:
+
+    http://www.musl-libc.org/
+*/
+
+#include "types.h"
+
+// #ifndef KERNEL_SPACE
+// #error "For user space use glibc inet_ntop"
+// #endif
+
+const char *inet_ntop(int af, const void *restrict a0, char *restrict 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:
+		if (memcmp(a, "\0\0\0\0\0\0\0\0\0\0\377\377", 12))
+			snprintf(buf, sizeof buf,
+				"%x:%x:%x:%x:%x:%x:%x:%x",
+				256*a[0]+a[1],256*a[2]+a[3],
+				256*a[4]+a[5],256*a[6]+a[7],
+				256*a[8]+a[9],256*a[10]+a[11],
+				256*a[12]+a[13],256*a[14]+a[15]);
+		else
+			snprintf(buf, sizeof buf,
+				"%x:%x:%x:%x:%x:%x:%d.%d.%d.%d",
+				256*a[0]+a[1],256*a[2]+a[3],
+				256*a[4]+a[5],256*a[6]+a[7],
+				256*a[8]+a[9],256*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>3) {
+			buf[best] = buf[best+1] = ':';
+			memmove(buf+best+2, buf+best+max, i-best-max+1);
+		}
+		if (strlen(buf) < l) {
+			strcpy(s, buf);
+			return s;
+		}
+		break;
+	default:
+		return 0;
+	}
+	return 0;
+}