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 netbsd openbsd windows
   6
   7 #include "runtime.h"
   8 #include "array.h"
   9
  10 extern Slice syscall_Envs __asm__ (GOSYM_PREFIX "syscall.Envs");
  11
  12 const byte*
  13 runtime_getenv(const char *s)
  14 {
  15         int32 i, j;
  16         intgo len;
  17         const byte *v, *bs;
  18         String* envv;
  19         int32 envc;
  20
  21         bs = (const byte*)s;
  22         len = runtime_findnull(bs);
  23         envv = (String*)syscall_Envs.__values;
  24         envc = syscall_Envs.__count;
  25         for(i=0; i<envc; i++){
  26                 if(envv[i].len <= len)
  27                         continue;
  28                 v = (const byte*)envv[i].str;
  29                 for(j=0; j<len; j++)
  30                         if(bs[j] != v[j])
  31                                 goto nomatch;
  32                 if(v[len] != '=')
  33                         goto nomatch;
  34                 return v+len+1;
  35         nomatch:;
  36         }
  37         return nil;
  38 }