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/* $NetBSD: type_alpha.c,v 1.11 2004/11/24 11:57:09 blymn Exp $ */
/*-
* Copyright (c) 1998-1999 Brett Lymn
* (blymn@baea.com.au, brett_lymn@yahoo.com.au)
* All rights reserved.
*
* This code has been donated to The NetBSD Foundation by the Author.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: type_alpha.c,v 1.11 2004/11/24 11:57:09 blymn Exp $");
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "form.h"
#include "internals.h"
/*
* The alpha type handling.
*/
typedef struct
{
unsigned width;
} alpha_args;
/*
* Create the alpha arguments structure from the given args. Return NULL
* if the call fails, otherwise return a pointer to the structure allocated.
*/
static char *
create_alpha_args(va_list *args)
{
alpha_args *new;
new = (alpha_args *) malloc(sizeof(alpha_args));
if (new != NULL)
new->width = va_arg(*args, int);
return (void *) new;
}
/*
* Copy the alpha argument structure.
*/
static char *
copy_alpha_args(char *args)
{
alpha_args *new;
new = (alpha_args *) malloc(sizeof(alpha_args));
if (new != NULL)
new->width = ((alpha_args *) (void *) args)->width;
return (void *) new;
}
/*
* Free the allocated storage associated with the type arguments.
*/
static void
free_alpha_args(char *args)
{
if (args != NULL)
free(args);
}
/*
* Check the contents of the field buffer are alphanumeric only.
*/
static int
alpha_check_field(FIELD *field, char *args)
{
int width, start, cur, end;
char *buf, *new;
width = ((alpha_args *) (void *) field->args)->width;
buf = args;
start = 0;
if (buf == NULL)
return FALSE;
/* skip leading white space */
while ((buf[start] != '\0')
&& ((buf[start] == ' ') || (buf[start] == '\t')))
start++;
/* no good if we have hit the end */
if (buf[start] == '\0')
return FALSE;
/* find the end of the non-whitespace stuff */
cur = start;
while(isalpha((unsigned char)buf[cur]))
cur++;
/* no good if it exceeds the width */
if ((cur - start) > width)
return FALSE;
end = cur;
/* check there is only trailing whitespace */
while ((buf[cur] != '\0')
&& ((buf[cur] == ' ') || (buf[cur] == '\t')))
cur++;
/* no good if we are not at the end of the string */
if (buf[cur] != '\0')
return FALSE;
/* set buffer 0 to the new string */
if ((new = (char *) malloc(sizeof(char) * (end - start))) == NULL)
return FALSE;
if ((end - start) >= 1) {
strncpy(new, &buf[start], (size_t) (end - start - 1));
new[end] = '\0';
} else
new[0] = '\0';
set_field_buffer(field, 0, new);
free(new);
/* otherwise all was ok */
return TRUE;
}
/*
* Check the given character is alphabetic, return TRUE if it is.
*/
static int
alpha_check_char(/* ARGSUSED1 */ int c, char *args)
{
return (isalpha(c) ? TRUE : FALSE);
}
static FIELDTYPE builtin_alpha = {
_TYPE_HAS_ARGS | _TYPE_IS_BUILTIN, /* flags */
0, /* refcount */
NULL, /* link */
create_alpha_args, /* make_args */
copy_alpha_args, /* copy_args */
free_alpha_args, /* free_args */
alpha_check_field, /* field_check */
alpha_check_char, /* char_check */
NULL, /* next_choice */
NULL /* prev_choice */
};
FIELDTYPE *TYPE_ALPHA = &builtin_alpha;
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