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      1 /*	$NetBSD: type_alnum.c,v 1.12 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 <stdlib.h>
     33 #include <stdarg.h>
     34 #include <string.h>
     35 #include <ctype.h>
     36 #include "form.h"
     37 #include "internals.h"
     38 
     39 /*
     40  * The alpha-numeric type handling.
     41  */
     42 
     43 typedef struct
     44 {
     45 	unsigned width;
     46 } alnum_args;
     47 
     48 /*
     49  * Create the alnum arguments structure from the given args.  Return NULL
     50  * if the call fails, otherwise return a pointer to the structure allocated.
     51  */
     52 static char *
     53 create_alnum_args(va_list *args)
     54 {
     55 	alnum_args *new;
     56 
     57 	new = malloc(sizeof(*new));
     58 
     59 	if (new != NULL)
     60 		new->width = va_arg(*args, int);
     61 
     62 	return (void *)new;
     63 }
     64 
     65 /*
     66  * Copy the alnum argument structure.
     67  */
     68 static char *
     69 copy_alnum_args(char *args)
     70 {
     71 	alnum_args *new;
     72 
     73 	new = malloc(sizeof(*new));
     74 
     75 	if (new != NULL)
     76 		new->width = ((alnum_args *) (void *)args)->width;
     77 
     78 	return (void *)new;
     79 }
     80 
     81 /*
     82  * Free the allocated storage associated with the type arguments.
     83  */
     84 static void
     85 free_alnum_args(char *args)
     86 {
     87 	if (args != NULL)
     88 		free(args);
     89 }
     90 
     91 /*
     92  * Check the contents of the field buffer are alphanumeric only.
     93  */
     94 static int
     95 alnum_check_field(FIELD *field, char *args)
     96 {
     97 	int width, start, cur, end;
     98 	char *buf, *new;
     99 
    100 	width = ((alnum_args *) (void *) field->args)->width;
    101 	buf = args;
    102 	start = 0;
    103 
    104 	if (buf == NULL)
    105 		return FALSE;
    106 
    107 	  /* skip leading white space */
    108 	while ((buf[start] != '\0')
    109 	       && ((buf[start] == ' ') || (buf[start] == '\t')))
    110 		start++;
    111 
    112 	  /* no good if we have hit the end */
    113 	if (buf[start] == '\0')
    114 		return FALSE;
    115 
    116 	  /* find the end of the non-whitespace stuff */
    117 	cur = start;
    118 	while(isalnum((unsigned char)buf[cur]))
    119 		cur++;
    120 
    121 	  /* no good if it exceeds the width */
    122 	if ((cur - start) > width)
    123 		return FALSE;
    124 
    125 	end = cur;
    126 
    127 	  /* check there is only trailing whitespace */
    128 	while ((buf[cur] != '\0')
    129 	       && ((buf[cur] == ' ') || (buf[cur] == '\t')))
    130 		cur++;
    131 
    132 	  /* no good if we are not at the end of the string */
    133 	if (buf[cur] != '\0')
    134 		return FALSE;
    135 
    136 	if ((new = malloc(sizeof(*new) * (end - start + 1))) == NULL)
    137 		return FALSE;
    138 
    139 	if ((end - start) >= 1) {
    140 		strncpy(new, &buf[start], (size_t) (end - start - 1));
    141 		new[end] = '\0';
    142 	} else
    143 		new[0]= '\0';
    144 
    145 	set_field_buffer(field, 0, new);
    146 	free(new);
    147 
    148 	  /* otherwise all was ok */
    149 	return TRUE;
    150 }
    151 
    152 /*
    153  * Check the given character is alpha-numeric, return TRUE if it is.
    154  */
    155 static int
    156 alnum_check_char(/* ARGSUSED1 */ int c, char *args)
    157 {
    158 	return (isalnum(c) ? TRUE : FALSE);
    159 }
    160 
    161 static FIELDTYPE builtin_alnum = {
    162 	_TYPE_HAS_ARGS | _TYPE_IS_BUILTIN,  /* flags */
    163 	0,                                  /* refcount */
    164 	NULL,                               /* link */
    165 	create_alnum_args,                  /* make_args */
    166 	copy_alnum_args,                    /* copy_args */
    167 	free_alnum_args,                    /* free_args */
    168 	alnum_check_field,                  /* field_check */
    169 	alnum_check_char,                   /* char_check */
    170 	NULL,                               /* next_choice */
    171 	NULL                                /* prev_choice */
    172 };
    173 
    174 FIELDTYPE *TYPE_ALNUM = &builtin_alnum;
    175 
    176 
    177