| /* go-unsetenv.c -- unset an environment variable from Go. |
| |
| Copyright 2015 The Go Authors. All rights reserved. |
| Use of this source code is governed by a BSD-style |
| license that can be found in the LICENSE file. */ |
| |
| #include "config.h" |
| |
| #include <stddef.h> |
| #include <stdlib.h> |
| |
| #include "runtime.h" |
| |
| /* Unset an environment variable from Go. This is called by |
| syscall.Unsetenv. */ |
| |
| void unsetenv_c (String) __asm__ (GOSYM_PREFIX "syscall.unsetenv__c"); |
| |
| void |
| unsetenv_c (String k) |
| { |
| const byte *ks; |
| unsigned char *kn; |
| |
| ks = k.str; |
| if (ks == NULL) |
| ks = (const byte *) ""; |
| kn = NULL; |
| |
| #ifdef HAVE_UNSETENV |
| |
| if (ks[k.len] != 0) |
| { |
| kn = malloc (k.len + 1); |
| if (kn == NULL) |
| runtime_throw ("out of malloc memory"); |
| __builtin_memcpy (kn, ks, k.len); |
| ks = kn; |
| } |
| |
| unsetenv ((const char *) ks); |
| |
| #endif /* !defined(HAVE_UNSETENV) */ |
| |
| if (kn != NULL) |
| free (kn); |
| } |