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-rw-r--r--libraries/librewrite/parse.c124
1 files changed, 124 insertions, 0 deletions
diff --git a/libraries/librewrite/parse.c b/libraries/librewrite/parse.c
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+++ b/libraries/librewrite/parse.c
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+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2000-2021 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+/* ACKNOWLEDGEMENT:
+ * This work was initially developed by Pierangelo Masarati for
+ * inclusion in OpenLDAP Software.
+ */
+
+#include <portable.h>
+
+#include <stdio.h>
+
+#include "rewrite-int.h"
+
+static int
+parse_line(
+ char **argv,
+ int *argc,
+ int maxargs,
+ char *buf
+)
+{
+ char *p, *begin;
+ int in_quoted_field = 0, cnt = 0;
+ char quote = '\0';
+
+ for ( p = buf; isspace( (unsigned char) p[ 0 ] ); p++ );
+
+ if ( p[ 0 ] == '#' ) {
+ return 0;
+ }
+
+ for ( begin = p; p[ 0 ] != '\0'; p++ ) {
+ if ( p[ 0 ] == '\\' && p[ 1 ] != '\0' ) {
+ p++;
+ } else if ( p[ 0 ] == '\'' || p[ 0 ] == '\"') {
+ if ( in_quoted_field && p[ 0 ] == quote ) {
+ in_quoted_field = 1 - in_quoted_field;
+ quote = '\0';
+ p[ 0 ] = '\0';
+ argv[ cnt ] = begin;
+ if ( ++cnt == maxargs ) {
+ *argc = cnt;
+ return 1;
+ }
+ for ( p++; isspace( (unsigned char) p[ 0 ] ); p++ );
+ begin = p;
+ p--;
+
+ } else if ( !in_quoted_field ) {
+ if ( p != begin ) {
+ return -1;
+ }
+ begin++;
+ in_quoted_field = 1 - in_quoted_field;
+ quote = p[ 0 ];
+ }
+ } else if ( isspace( (unsigned char) p[ 0 ] ) && !in_quoted_field ) {
+ p[ 0 ] = '\0';
+ argv[ cnt ] = begin;
+
+ if ( ++cnt == maxargs ) {
+ *argc = cnt;
+ return 1;
+ }
+
+ for ( p++; isspace( (unsigned char) p[ 0 ] ); p++ );
+ begin = p;
+ p--;
+ }
+ }
+
+ *argc = cnt;
+
+ return 1;
+}
+
+int
+rewrite_read(
+ FILE *fin,
+ struct rewrite_info *info
+)
+{
+ char buf[ 1024 ];
+ char *argv[11];
+ int argc, lineno;
+
+ /*
+ * Empty rule at the beginning of the context
+ */
+
+ for ( lineno = 0; fgets( buf, sizeof( buf ), fin ); lineno++ ) {
+ switch ( parse_line( argv, &argc, sizeof( argv ) - 1, buf ) ) {
+ case -1:
+ return REWRITE_ERR;
+ case 0:
+ break;
+ case 1:
+ if ( strncasecmp( argv[ 0 ], "rewrite", 7 ) == 0 ) {
+ int rc;
+ rc = rewrite_parse( info, "file", lineno,
+ argc, argv );
+ if ( rc != REWRITE_SUCCESS ) {
+ return rc;
+ }
+ }
+ break;
+ }
+ }
+
+ return REWRITE_SUCCESS;
+}
+