ITS#8603 Add ldif_open_mem()

ldif_open_mem() is the fmemopen(3) equivalent of ldif_open() which opens
an ldif steam from memory, rather than from a file.

configure.in

@@ -863,6 +863,7 @@ dnl ----------------------------------------------------------------
 dnl Checks for libraries
 
 AC_CHECK_FUNCS( sigaction sigset )
+AC_CHECK_FUNCS( fmemopen )
 
 dnl HP-UX requires -lV3
 dnl this is not needed on newer versions of HP-UX

include/ldif.h

@@ -99,6 +99,10 @@ typedef struct LDIFFP {
 LDAP_LDIF_F( LDIFFP * )
 ldif_open LDAP_P(( LDAP_CONST char *file, LDAP_CONST char *mode ));
 
+/* ldif_open equivalent that opens ldif stream in memory rather than from file */
+LDAP_LDIF_F( LDIFFP * )
+ldif_open_mem LDAP_P(( char *ldif, size_t size, LDAP_CONST char *mode ));
+
 LDAP_LDIF_F( void )
 ldif_close LDAP_P(( LDIFFP * ));
 

libraries/libldap/ldif.c

@@ -740,6 +740,28 @@ ldif_open(
 	return lfp;
 }
 
+LDIFFP *
+ldif_open_mem(
+	char *ldif,
+	size_t size,
+	LDAP_CONST char *mode
+)
+{
+#ifdef HAVE_FMEMOPEN
+	FILE *fp = fmemopen( ldif, size, mode );
+	LDIFFP *lfp = NULL;
+
+	if ( fp ) {
+		lfp = ber_memalloc( sizeof( LDIFFP ));
+		lfp->fp = fp;
+		lfp->prev = NULL;
+	}
+	return lfp;
+#else /* !HAVE_FMEMOPEN */
+	return NULL;
+#endif /* !HAVE_FMEMOPEN */
+}
+
 void
 ldif_close(
 	LDIFFP *lfp