git.sur5r.net Git - openldap/blob - libraries/librewrite/parse.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 2000-2017 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15 /* ACKNOWLEDGEMENT:
  16  * This work was initially developed by Pierangelo Masarati for
  17  * inclusion in OpenLDAP Software.
  18  */
  19
  20 #include <portable.h>
  21
  22 #include <stdio.h>
  23
  24 #include "rewrite-int.h"
  25
  26 static int
  27 parse_line(
  28                 char **argv,
  29                 int *argc,
  30                 int maxargs,
  31                 char *buf
  32 )
  33 {
  34         char *p, *begin;
  35         int in_quoted_field = 0, cnt = 0;
  36         char quote = '\0';
  37
  38         for ( p = buf; isspace( (unsigned char) p[ 0 ] ); p++ );
  39
  40         if ( p[ 0 ] == '#' ) {
  41                 return 0;
  42         }
  43
  44         for ( begin = p;  p[ 0 ] != '\0'; p++ ) {
  45                 if ( p[ 0 ] == '\\' && p[ 1 ] != '\0' ) {
  46                         p++;
  47                 } else if ( p[ 0 ] == '\'' || p[ 0 ] == '\"') {
  48                         if ( in_quoted_field && p[ 0 ] == quote ) {
  49                                 in_quoted_field = 1 - in_quoted_field;
  50                                 quote = '\0';
  51                                 p[ 0 ] = '\0';
  52                                 argv[ cnt ] = begin;
  53                                 if ( ++cnt == maxargs ) {
  54                                         *argc = cnt;
  55                                         return 1;
  56                                 }
  57                                 for ( p++; isspace( (unsigned char) p[ 0 ] ); p++ );
  58                                 begin = p;
  59                                 p--;
  60
  61                         } else if ( !in_quoted_field ) {
  62                                 if ( p != begin ) {
  63                                         return -1;
  64                                 }
  65                                 begin++;
  66                                 in_quoted_field = 1 - in_quoted_field;
  67                                 quote = p[ 0 ];
  68                         }
  69                 } else if ( isspace( (unsigned char) p[ 0 ] ) && !in_quoted_field ) {
  70                         p[ 0 ] = '\0';
  71                         argv[ cnt ] = begin;
  72
  73                         if ( ++cnt == maxargs ) {
  74                                 *argc = cnt;
  75                                 return 1;
  76                         }
  77
  78                         for ( p++; isspace( (unsigned char) p[ 0 ] ); p++ );
  79                         begin = p;
  80                         p--;
  81                 }
  82         }
  83
  84         *argc = cnt;
  85
  86         return 1;
  87 }
  88
  89 int
  90 rewrite_read(
  91                 FILE *fin,
  92                 struct rewrite_info *info
  93 )
  94 {
  95         char buf[ 1024 ];
  96         char *argv[11];
  97         int argc, lineno;
  98
  99         /*
 100          * Empty rule at the beginning of the context
 101          */
 102
 103         for ( lineno = 0; fgets( buf, sizeof( buf ), fin ); lineno++ ) {
 104                 switch ( parse_line( argv, &argc, sizeof( argv ) - 1, buf ) ) {
 105                 case -1:
 106                         return REWRITE_ERR;
 107                 case 0:
 108                         break;
 109                 case 1:
 110                         if ( strncasecmp( argv[ 0 ], "rewrite", 7 ) == 0 ) {
 111                                 int rc;
 112                                 rc = rewrite_parse( info, "file", lineno,
 113                                                 argc, argv );
 114                                 if ( rc != REWRITE_SUCCESS ) {
 115                                         return rc;
 116                                 }
 117                         }
 118                         break;
 119                 }
 120         }
 121
 122         return REWRITE_SUCCESS;
 123 }
 124