1  // Copyright 2012 The Go Authors. All rights reserved.
       2  // Use of this source code is governed by a BSD-style
       3  // license that can be found in the LICENSE file.
       4  
       5  // +build darwin dragonfly freebsd hurd linux nacl netbsd openbsd solaris windows
       6  
       7  #include "runtime.h"
       8  #include "array.h"
       9  #include "arch.h"
      10  
      11  extern Slice runtime_get_envs(void);
      12  
      13  String
      14  runtime_getenv(const char *s)
      15  {
      16  	int32 i, j;
      17  	intgo len;
      18  	const byte *v, *bs;
      19  	Slice envs;
      20  	String* envv;
      21  	int32 envc;
      22  	String ret;
      23  
      24  	bs = (const byte*)s;
      25  	len = runtime_findnull(bs);
      26  	envs = runtime_get_envs();
      27  	envv = (String*)envs.__values;
      28  	envc = envs.__count;
      29  	for(i=0; i<envc; i++){
      30  		if(envv[i].len <= len)
      31  			continue;
      32  		v = (const byte*)envv[i].str;
      33  		for(j=0; j<len; j++)
      34  			if(bs[j] != v[j])
      35  				goto nomatch;
      36  		if(v[len] != '=')
      37  			goto nomatch;
      38  		ret.str = v+len+1;
      39  		ret.len = envv[i].len-len-1;
      40  		return ret;
      41  	nomatch:;
      42  	}
      43  	ret.str = nil;
      44  	ret.len = 0;
      45  	return ret;
      46  }