Add getsubopt implementation for Android

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>

configure.ac

@@ -589,6 +589,10 @@ AC_CHECK_FUNCS([getline],
 	AM_CONDITIONAL(HAVE_GETLINE, true)
 	AC_DEFINE(HAVE_GETLINE,1,[Have getline]),
 	AM_CONDITIONAL(HAVE_GETLINE, false))
+AC_CHECK_FUNCS([getsubopt],
+	AM_CONDITIONAL(HAVE_GETSUBOPT, true)
+	AC_DEFINE(HAVE_GETSUBOPT,1,[Have getsubopt]),
+	AM_CONDITIONAL(HAVE_GETSUBOPT, false))
 AC_CHECK_FUNCS([fgetln],
 	AM_CONDITIONAL(HAVE_FGETLN, true)
 	AC_DEFINE(HAVE_FGETLN,1,[Have fgetln]),

src/include/getsubopt.c

@@ -0,0 +1,89 @@
+/*
+ * Android c-library does not have getsubopt,
+ * so code lifted from uClibc
+ * http://git.uclibc.org/uClibc/tree/libc/unistd/getsubopt.c
+ */
+
+/* Parse comma separate list into words.
+   Copyright (C) 1996, 1997, 1999, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+
+#include <stdlib.h>
+#include <string.h>
+
+char *strchrnul(const char *s, int c)
+{
+    char *result;
+
+    result = strchr( s, c );
+
+    if( !result )
+    {
+        result = (char *)s + strlen( s );
+    }
+
+    return( result );
+}
+
+/* Parse comma separated suboption from *OPTIONP and match against
+   strings in TOKENS.  If found return index and set *VALUEP to
+   optional value introduced by an equal sign.  If the suboption is
+   not part of TOKENS return in *VALUEP beginning of unknown
+   suboption.  On exit *OPTIONP is set to the beginning of the next
+   token or at the terminating NUL character.  */
+int
+getsubopt (char **optionp, char *const *tokens, char **valuep)
+{
+  char *endp, *vstart;
+  int cnt;
+
+  if (**optionp == '\0')
+    return -1;
+
+  /* Find end of next token.  */
+  endp = strchrnul (*optionp, ',');
+
+  /* Find start of value.  */
+  vstart = memchr (*optionp, '=', endp - *optionp);
+  if (vstart == NULL)
+    vstart = endp;
+
+  /* Try to match the characters between *OPTIONP and VSTART against
+     one of the TOKENS.  */
+  for (cnt = 0; tokens[cnt] != NULL; ++cnt)
+    if (strncmp (*optionp, tokens[cnt], vstart - *optionp) == 0
+    && tokens[cnt][vstart - *optionp] == '\0')
+      {
+    /* We found the current option in TOKENS.  */
+    *valuep = vstart != endp ? vstart + 1 : NULL;
+
+    if (*endp != '\0')
+      *endp++ = '\0';
+    *optionp = endp;
+
+    return cnt;
+      }
+
+  /* The current suboption does not match any option.  */
+  *valuep = *optionp;
+
+  if (*endp != '\0')
+    *endp++ = '\0';
+  *optionp = endp;
+
+  return -1;
+}

src/include/getsubopt.h

@@ -0,0 +1,4 @@
+#ifndef _getsubopt_h
+#define _getsubopt_h
+int getsubopt (char **optionp, char *const *tokens, char **valuep);
+#endif

src/lxc/Makefile.am

@@ -38,6 +38,10 @@ noinst_HEADERS += ../include/getline.h
 endif
 endif
 
+if !HAVE_GETSUBOPT
+noinst_HEADERS += ../include/getsubopt.h
+endif
+
 sodir=$(libdir)
 # use PROGRAMS to avoid complains from automake
 so_PROGRAMS = liblxc.so
@@ -240,6 +244,10 @@ lxc_usernsexec_SOURCES = lxc_usernsexec.c
 lxc_user_nic_SOURCES = lxc_user_nic.c network.c network.h
 lxc_checkpoint_SOURCES = lxc_checkpoint.c
 
+if !HAVE_GETSUBOPT
+lxc_copy_SOURCES += ../include/getsubopt.c ../include/getsubopt.h
+endif
+
 if HAVE_STATIC_LIBCAP
 sbin_PROGRAMS += init.lxc.static
 

src/lxc/lxc_copy.c

@@ -17,6 +17,8 @@
  */
 
 #define _GNU_SOURCE
+#include "config.h"
+
 #include <unistd.h>
 #include <getopt.h>
 #include <signal.h>
@@ -44,6 +46,10 @@
 #include "utils.h"
 #include "bdev.h"
 
+#ifndef HAVE_GETSUBOPT
+#include <../include/getsubopt.h>
+#endif
+
 lxc_log_define(lxc_copy_ui, lxc);
 
 enum mnttype {