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      1 /*	$NetBSD: type_alpha.c,v 1.13 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_alpha.c,v 1.13 2021/04/13 13:13:04 christos Exp $");
     34 
     35 #include <stdlib.h>
     36 #include <string.h>
     37 #include <ctype.h>
     38 #include "form.h"
     39 #include "internals.h"
     40 
     41 /*
     42  * The alpha type handling.
     43  */
     44 
     45 typedef struct
     46 {
     47 	unsigned width;
     48 } alpha_args;
     49 
     50 /*
     51  * Create the alpha arguments structure from the given args.  Return NULL
     52  * if the call fails, otherwise return a pointer to the structure allocated.
     53  */
     54 static char *
     55 create_alpha_args(va_list *args)
     56 {
     57 	alpha_args *new;
     58 
     59 	new = malloc(sizeof(*new));
     60 
     61 	if (new != NULL)
     62 		new->width = va_arg(*args, int);
     63 
     64 	return (void *) new;
     65 }
     66 
     67 /*
     68  * Copy the alpha argument structure.
     69  */
     70 static char *
     71 copy_alpha_args(char *args)
     72 {
     73 	alpha_args *new;
     74 
     75 	new = malloc(sizeof(*new));
     76 
     77 	if (new != NULL)
     78 		new->width = ((alpha_args *) (void *) args)->width;
     79 
     80 	return (void *) new;
     81 }
     82 
     83 /*
     84  * Free the allocated storage associated with the type arguments.
     85  */
     86 static void
     87 free_alpha_args(char *args)
     88 {
     89 	if (args != NULL)
     90 		free(args);
     91 }
     92 
     93 /*
     94  * Check the contents of the field buffer are alphanumeric only.
     95  */
     96 static int
     97 alpha_check_field(FIELD *field, char *args)
     98 {
     99 	int width, start, cur, end;
    100 	char *buf, *new;
    101 
    102 	width = ((alpha_args *) (void *) field->args)->width;
    103 	buf = args;
    104 	start = 0;
    105 
    106 	if (buf == NULL)
    107 		return FALSE;
    108 
    109 	  /* skip leading white space */
    110 	while ((buf[start] != '\0')
    111 	       && ((buf[start] == ' ') || (buf[start] == '\t')))
    112 		start++;
    113 
    114 	  /* no good if we have hit the end */
    115 	if (buf[start] == '\0')
    116 		return FALSE;
    117 
    118 	  /* find the end of the non-whitespace stuff */
    119 	cur = start;
    120 	while(isalpha((unsigned char)buf[cur]))
    121 		cur++;
    122 
    123 	  /* no good if it exceeds the width */
    124 	if ((cur - start) > width)
    125 		return FALSE;
    126 
    127 	end = cur;
    128 
    129 	  /* check there is only trailing whitespace */
    130 	while ((buf[cur] != '\0')
    131 	       && ((buf[cur] == ' ') || (buf[cur] == '\t')))
    132 		cur++;
    133 
    134 	  /* no good if we are not at the end of the string */
    135 	if (buf[cur] != '\0')
    136 		return FALSE;
    137 
    138 	  /* set buffer 0 to the new string */
    139 	if ((new = malloc(sizeof(*new) * (end - start + 1))) == NULL)
    140 		return FALSE;
    141 
    142 	if ((end - start) >= 1) {
    143 		strncpy(new, &buf[start], (size_t) (end - start - 1));
    144 		new[end] = '\0';
    145 	} else
    146 		new[0] = '\0';
    147 
    148 
    149 	set_field_buffer(field, 0, new);
    150 	free(new);
    151 
    152 	  /* otherwise all was ok */
    153 	return TRUE;
    154 }
    155 
    156 /*
    157  * Check the given character is alphabetic, return TRUE if it is.
    158  */
    159 static int
    160 alpha_check_char(/* ARGSUSED1 */ int c, char *args)
    161 {
    162 	return (isalpha(c) ? TRUE : FALSE);
    163 }
    164 
    165 static FIELDTYPE builtin_alpha = {
    166 	_TYPE_HAS_ARGS | _TYPE_IS_BUILTIN,  /* flags */
    167 	0,                                  /* refcount */
    168 	NULL,                               /* link */
    169 	create_alpha_args,                  /* make_args */
    170 	copy_alpha_args,                    /* copy_args */
    171 	free_alpha_args,                    /* free_args */
    172 	alpha_check_field,                  /* field_check */
    173 	alpha_check_char,                   /* char_check */
    174 	NULL,                               /* next_choice */
    175 	NULL                                /* prev_choice */
    176 };
    177 
    178 FIELDTYPE *TYPE_ALPHA = &builtin_alpha;
    179 
    180 
    181