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 syscall_Envs __asm__ (GOSYM_PREFIX "syscall.Envs");
  13
  14 const byte*
  15 runtime_getenv(const char *s)
  16 {
  17         int32 i, j;
  18         intgo len;
  19         const byte *v, *bs;
  20         String* envv;
  21         int32 envc;
  22
  23         bs = (const byte*)s;
  24         len = runtime_findnull(bs);
  25         envv = (String*)syscall_Envs.__values;
  26         envc = syscall_Envs.__count;
  27         for(i=0; i<envc; i++){
  28                 if(envv[i].len <= len)
  29                         continue;
  30                 v = (const byte*)envv[i].str;
  31                 for(j=0; j<len; j++)
  32                         if(bs[j] != v[j])
  33                                 goto nomatch;
  34                 if(v[len] != '=')
  35                         goto nomatch;
  36                 return v+len+1;
  37         nomatch:;
  38         }
  39         return nil;
  40 }