libgo: Update to revision 15193:6fdc1974457c of master library.

From-SVN: r194692

1 files changed, 37 insertions, 0 deletions

diff --git a/libgo/runtime/env_posix.c b/libgo/runtime/env_posix.c
new file mode 100644
index 00000000000..31f41793530
--- /dev/null
+++ b/libgo/runtime/env_posix.c
@@ -0,0 +1,37 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin freebsd linux netbsd openbsd windows
+
+#include "runtime.h"
+#include "array.h"
+
+extern Slice syscall_Envs asm ("syscall.Envs");
+
+const byte*
+runtime_getenv(const char *s)
+{
+	int32 i, j, len;
+	const byte *v, *bs;
+	String* envv;
+	int32 envc;
+
+	bs = (const byte*)s;
+	len = runtime_findnull(bs);
+	envv = (String*)syscall_Envs.__values;
+	envc = syscall_Envs.__count;
+	for(i=0; i<envc; i++){
+		if(envv[i].len <= len)
+			continue;
+		v = (const byte*)envv[i].str;
+		for(j=0; j<len; j++)
+			if(bs[j] != v[j])
+				goto nomatch;
+		if(v[len] != '=')
+			goto nomatch;
+		return v+len+1;
+	nomatch:;
+	}
+	return nil;
+}