libgo/runtime/env_posix.c

   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 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 }