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 #include "malloc.h"
  11
  12 extern Slice runtime_get_envs(void);
  13
  14 String
  15 runtime_getenv(const char *s)
  16 {
  17         int32 i, j;
  18         intgo len;
  19         const byte *v, *bs;
  20         Slice envs;
  21         String* envv;
  22         int32 envc;
  23         String ret;
  24
  25         bs = (const byte*)s;
  26         len = runtime_findnull(bs);
  27         envs = runtime_get_envs();
  28         envv = (String*)envs.__values;
  29         envc = envs.__count;
  30         for(i=0; i<envc; i++){
  31                 if(envv[i].len <= len)
  32                         continue;
  33                 v = (const byte*)envv[i].str;
  34                 for(j=0; j<len; j++)
  35                         if(bs[j] != v[j])
  36                                 goto nomatch;
  37                 if(v[len] != '=')
  38                         goto nomatch;
  39                 ret.str = v+len+1;
  40                 ret.len = envv[i].len-len-1;
  41                 return ret;
  42         nomatch:;
  43         }
  44         ret.str = nil;
  45         ret.len = 0;
  46         return ret;
  47 }