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      1 /*	$NetBSD: type_regex.c,v 1.8 2021/04/13 13:13:04 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998-1999 Brett Lymn
      5  *                         (blymn (at) baea.com.au, brett_lymn (at) yahoo.com.au)
      6  * All rights reserved.
      7  *
      8  * This code has been donated to The NetBSD Foundation by the Author.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  *
     29  *
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD: type_regex.c,v 1.8 2021/04/13 13:13:04 christos Exp $");
     34 
     35 #include <stdlib.h>
     36 #include <sys/types.h>
     37 #include <regex.h>
     38 #include "form.h"
     39 #include "internals.h"
     40 
     41 /*
     42  * The regex type handling.
     43  */
     44 
     45 typedef struct
     46 {
     47 	regex_t compiled;
     48 	unsigned references;
     49 } regex_args;
     50 
     51 /*
     52  * Create the regex arguments structure from the given args.  Return NULL
     53  * if the call fails, otherwise return a pointer to the structure allocated.
     54  */
     55 static char *
     56 create_regex_args(va_list *args)
     57 {
     58 	regex_args *new;
     59 	char *expression;
     60 
     61 	new = malloc(sizeof(*new));
     62 
     63 	if (new != NULL) {
     64 		new->references = 1;
     65 		expression = va_arg(*args, char *);
     66 		if ((regcomp(&new->compiled, expression,
     67 			     (REG_EXTENDED | REG_NOSUB | REG_NEWLINE))) != 0) {
     68 			free(new);
     69 			return NULL;
     70 		}
     71 	}
     72 
     73 	return (void *) new;
     74 }
     75 
     76 /*
     77  * Copy the regex argument structure.
     78  */
     79 static char *
     80 copy_regex_args(char *args)
     81 {
     82 	((regex_args *) (void *) args)->references++;
     83 
     84 	return (void *) args;
     85 }
     86 
     87 /*
     88  * Free the allocated storage associated with the type arguments.
     89  */
     90 static void
     91 free_regex_args(char *args)
     92 {
     93 	if (args != NULL) {
     94 		((regex_args *) (void *) args)->references--;
     95 		if (((regex_args *) (void *) args)->references == 0)
     96 			free(args);
     97 	}
     98 }
     99 
    100 /*
    101  * Check the contents of the field buffer match the regex.
    102  */
    103 static int
    104 regex_check_field(FIELD *field, char *args)
    105 {
    106 	if ((args != NULL) &&
    107 	    (regexec(&((regex_args *) (void *) field->args)->compiled,
    108 		   args, (size_t) 0, NULL, 0) == 0))
    109 		return TRUE;
    110 
    111 	return FALSE;
    112 }
    113 
    114 static FIELDTYPE builtin_regex = {
    115 	_TYPE_HAS_ARGS | _TYPE_IS_BUILTIN,  /* flags */
    116 	0,                                  /* refcount */
    117 	NULL,                               /* link */
    118 	create_regex_args,                  /* make_args */
    119 	copy_regex_args,                    /* copy_args */
    120 	free_regex_args,                    /* free_args */
    121 	regex_check_field,                  /* field_check */
    122 	NULL,                               /* char_check */
    123 	NULL,                               /* next_choice */
    124 	NULL                                /* prev_choice */
    125 };
    126 
    127 FIELDTYPE *TYPE_REGEXP = &builtin_regex;
    128 
    129 
    130