177 lines
4.4 KiB
C
177 lines
4.4 KiB
C
/* $NetBSD: type_alnum.c,v 1.10 2004/11/24 11:57:09 blymn Exp $ */
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/*-
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* Copyright (c) 1998-1999 Brett Lymn
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* (blymn@baea.com.au, brett_lymn@yahoo.com.au)
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* All rights reserved.
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*
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* This code has been donated to The NetBSD Foundation by the Author.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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*/
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <ctype.h>
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#include "form.h"
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#include "internals.h"
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/*
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* The alpha-numeric type handling.
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*/
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typedef struct
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{
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unsigned width;
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} alnum_args;
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/*
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* Create the alnum arguments structure from the given args. Return NULL
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* if the call fails, otherwise return a pointer to the structure allocated.
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*/
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static char *
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create_alnum_args(va_list *args)
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{
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alnum_args *new;
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new = (alnum_args *) malloc(sizeof(alnum_args));
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if (new != NULL)
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new->width = va_arg(*args, int);
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return (void *) new;
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}
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/*
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* Copy the alnum argument structure.
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*/
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static char *
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copy_alnum_args(char *args)
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{
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alnum_args *new;
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new = (alnum_args *) malloc(sizeof(alnum_args));
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if (new != NULL)
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new->width = ((alnum_args *) (void *)args)->width;
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return (char *) (void *) new;
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}
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/*
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* Free the allocated storage associated with the type arguments.
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*/
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static void
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free_alnum_args(char *args)
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{
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if (args != NULL)
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free(args);
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}
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/*
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* Check the contents of the field buffer are alphanumeric only.
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*/
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static int
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alnum_check_field(FIELD *field, char *args)
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{
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int width, start, cur, end;
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char *buf, *new;
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width = ((alnum_args *) (void *) field->args)->width;
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buf = args;
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start = 0;
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if (buf == NULL)
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return FALSE;
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/* skip leading white space */
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while ((buf[start] != '\0')
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&& ((buf[start] == ' ') || (buf[start] == '\t')))
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start++;
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/* no good if we have hit the end */
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if (buf[start] == '\0')
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return FALSE;
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/* find the end of the non-whitespace stuff */
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cur = start;
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while(isalnum((unsigned char)buf[cur]))
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cur++;
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/* no good if it exceeds the width */
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if ((cur - start) > width)
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return FALSE;
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end = cur;
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/* check there is only trailing whitespace */
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while ((buf[cur] != '\0')
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&& ((buf[cur] == ' ') || (buf[cur] == '\t')))
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cur++;
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/* no good if we are not at the end of the string */
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if (buf[cur] != '\0')
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return FALSE;
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if ((new = (char *) malloc(sizeof(char) * (end - start))) == NULL)
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return FALSE;
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if ((end - start) >= 1) {
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strncpy(new, &buf[start], (size_t) (end - start - 1));
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new[end] = '\0';
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} else
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new[0]= '\0';
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set_field_buffer(field, 0, new);
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free(new);
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/* otherwise all was ok */
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return TRUE;
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}
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/*
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* Check the given character is alpha-numeric, return TRUE if it is.
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*/
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static int
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alnum_check_char(/* ARGSUSED1 */ int c, char *args)
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{
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return (isalnum(c) ? TRUE : FALSE);
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}
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static FIELDTYPE builtin_alnum = {
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_TYPE_HAS_ARGS | _TYPE_IS_BUILTIN, /* flags */
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0, /* refcount */
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NULL, /* link */
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create_alnum_args, /* make_args */
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copy_alnum_args, /* copy_args */
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free_alnum_args, /* free_args */
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alnum_check_field, /* field_check */
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alnum_check_char, /* char_check */
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NULL, /* next_choice */
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NULL /* prev_choice */
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};
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FIELDTYPE *TYPE_ALNUM = &builtin_alnum;
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