Update Gnulib to v0.1-77-gd9361da

[bpt/guile.git] / lib / putenv.c

diff --git a/lib/putenv.c b/lib/putenv.c
index 2abc6ac..de8caa7 100644 (file)
--- a/lib/putenv.c
+++ b/lib/putenv.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1994, 1997-1998, 2000, 2003-2013 Free Software
+/* Copyright (C) 1991, 1994, 1997-1998, 2000, 2003-2014 Free Software
    Foundation, Inc.
 
    NOTE: The canonical source of this file is maintained with the GNU C
@@ -34,6 +34,11 @@
 #include <string.h>
 #include <unistd.h>
 
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
+#endif
+
 #if _LIBC
 # if HAVE_GNU_LD
 #  define environ __environ
@@ -57,7 +62,9 @@ static int
 _unsetenv (const char *name)
 {
   size_t len;
+#if !HAVE_DECL__PUTENV
   char **ep;
+#endif
 
   if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
     {
@@ -67,6 +74,21 @@ _unsetenv (const char *name)
 
   len = strlen (name);
 
+#if HAVE_DECL__PUTENV
+  {
+    int putenv_result, putenv_errno;
+    char *name_ = malloc (len + 2);
+    memcpy (name_, name, len);
+    name_[len] = '=';
+    name_[len + 1] = 0;
+    putenv_result = _putenv (name_);
+    putenv_errno = errno;
+    free (name_);
+    __set_errno (putenv_errno);
+    return putenv_result;
+  }
+#else
+
   LOCK;
 
   ep = environ;
@@ -87,6 +109,7 @@ _unsetenv (const char *name)
   UNLOCK;
 
   return 0;
+#endif
 }
 
 
@@ -95,9 +118,8 @@ _unsetenv (const char *name)
 int
 putenv (char *string)
 {
-  const char *const name_end = strchr (string, '=');
-  register size_t size;
-  register char **ep;
+  const char *name_end = strchr (string, '=');
+  char **ep;
 
   if (name_end == NULL)
     {
@@ -105,62 +127,68 @@ putenv (char *string)
       return _unsetenv (string);
     }
 
-  size = 0;
-  for (ep = environ; *ep != NULL; ++ep)
-    if (!strncmp (*ep, string, name_end - string) &&
-        (*ep)[name_end - string] == '=')
-      break;
-    else
-      ++size;
-
-  if (*ep == NULL)
+#if HAVE_DECL__PUTENV
+  /* Rely on _putenv to allocate the new environment.  If other
+     parts of the application use _putenv, the !HAVE_DECL__PUTENV code
+     would fight over who owns the environ vector, causing a crash.  */
+  if (name_end[1])
+    return _putenv (string);
+  else
     {
-#if HAVE__PUTENV
-      /* Rely on _putenv to allocate the new environment.  If other
-         parts of the application use _putenv, the !HAVE__PUTENV code
-         would fight over who owns the environ vector, causing a crash.  */
-      if (name_end[1])
-        return _putenv (string);
-      else
+      /* _putenv ("NAME=") unsets NAME, so invoke _putenv ("NAME= ")
+         to allocate the environ vector and then replace the new
+         entry with "NAME=".  */
+      int putenv_result, putenv_errno;
+      char *name_x = malloc (name_end - string + sizeof "= ");
+      if (!name_x)
+        return -1;
+      memcpy (name_x, string, name_end - string + 1);
+      name_x[name_end - string + 1] = ' ';
+      name_x[name_end - string + 2] = 0;
+      putenv_result = _putenv (name_x);
+      putenv_errno = errno;
+      for (ep = environ; *ep; ep++)
+        if (strcmp (*ep, name_x) == 0)
+          {
+            *ep = string;
+            break;
+          }
+# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+      if (putenv_result == 0)
         {
-          /* _putenv ("NAME=") unsets NAME, so invoke _putenv ("NAME=x")
-             to allocate the environ vector and then replace the new
-             entry with "NAME=".  */
-          int putenv_result, putenv_errno;
-          char *name_x = malloc (name_end - string + sizeof "=x");
-          if (!name_x)
-            return -1;
-          memcpy (name_x, string, name_end - string + 1);
-          name_x[name_end - string + 1] = 'x';
-          name_x[name_end - string + 2] = 0;
-          putenv_result = _putenv (name_x);
-          putenv_errno = errno;
-          for (ep = environ; *ep; ep++)
-            if (*ep == name_x)
-              {
-                *ep = string;
-                break;
-              }
-          free (name_x);
-          __set_errno (putenv_errno);
-          return putenv_result;
+          /* _putenv propagated "NAME= " into the subprocess environment;
+             fix that by calling SetEnvironmentVariable directly.  */
+          name_x[name_end - string] = 0;
+          putenv_result = SetEnvironmentVariable (name_x, "") ? 0 : -1;
+          putenv_errno = ENOMEM; /* ENOMEM is the only way to fail.  */
         }
+# endif
+      free (name_x);
+      __set_errno (putenv_errno);
+      return putenv_result;
+    }
 #else
+  for (ep = environ; *ep; ep++)
+    if (strncmp (*ep, string, name_end - string) == 0
+        && (*ep)[name_end - string] == '=')
+      break;
+
+  if (*ep)
+    *ep = string;
+  else
+    {
       static char **last_environ = NULL;
-      char **new_environ = (char **) malloc ((size + 2) * sizeof (char *));
-      if (new_environ == NULL)
+      size_t size = ep - environ;
+      char **new_environ = malloc ((size + 2) * sizeof *new_environ);
+      if (! new_environ)
         return -1;
-      (void) memcpy ((void *) new_environ, (void *) environ,
-                     size * sizeof (char *));
-      new_environ[size] = (char *) string;
-      new_environ[size + 1] = NULL;
+      new_environ[0] = string;
+      memcpy (new_environ + 1, environ, (size + 1) * sizeof *new_environ);
       free (last_environ);
       last_environ = new_environ;
       environ = new_environ;
-#endif
     }
-  else
-    *ep = string;
 
   return 0;
+#endif
 }