a0e6850f82
No Minix-specific changes needed. Change-Id: Ia8ddbdb57ac04dfb42d79c374b9e25b189f9dc3b
220 lines
5.6 KiB
C
220 lines
5.6 KiB
C
/* $NetBSD: type_numeric.c,v 1.8 2004/10/28 21:14:52 dsl 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 <sys/cdefs.h>
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__RCSID("$NetBSD: type_numeric.c,v 1.8 2004/10/28 21:14:52 dsl Exp $");
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#include <stdlib.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 numeric type handling.
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*/
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typedef struct
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{
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unsigned precision;
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double min;
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double max;
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} numeric_args;
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/*
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* Create the numeric 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_numeric_args(va_list *args)
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{
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numeric_args *new;
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new = (numeric_args *) malloc(sizeof(numeric_args));
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if (new != NULL) {
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new->precision = va_arg(*args, unsigned);
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new->min = va_arg(*args, double);
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new->max = va_arg(*args, double);
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}
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return (void *) new;
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}
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/*
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* Copy the numeric argument structure.
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*/
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static char *
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copy_numeric_args(char *args)
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{
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numeric_args *new;
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new = (numeric_args *) malloc(sizeof(numeric_args));
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if (new != NULL)
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bcopy(args, new, sizeof(numeric_args));
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return (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_numeric_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 numeric only. A valid
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* number is of the form nnnn[.mmmmm][Ee[+-]ddd]
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*/
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static int
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numeric_check_field(FIELD *field, char *args)
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{
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int cur;
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double number, max, min;
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int precision;
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char *buf, *new_buf;
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if (args == NULL)
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return FALSE;
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precision = ((numeric_args *) (void *) field->args)->precision;
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min = ((numeric_args *) (void *) field->args)->min;
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max = ((numeric_args *) (void *) field->args)->max;
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buf = args;
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cur = 0;
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/* skip leading white space */
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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 have hit the end */
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if (buf[cur] == '\0')
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return FALSE;
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/* find the end of the digits but allow a leading + or - sign, and
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* a decimal point.
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*/
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if ((buf[cur] == '-') || (buf[cur] == '+'))
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cur++;
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while(isdigit((unsigned char)buf[cur]))
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cur++;
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/* if not at end of string then check for decimal... */
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if ((buf[cur] != '\0') && (buf[cur] == '.')) {
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cur++;
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/* check for more digits now.... */
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while(isdigit((unsigned char)buf[cur]))
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cur++;
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}
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/* check for an exponent */
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if ((buf[cur] != '\0') &&
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((buf[cur] == 'E') || (buf[cur] == 'e'))) {
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cur++;
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if (buf[cur] == '\0')
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return FALSE;
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/* allow a + or a - for exponent */
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if ((buf[cur] == '+') || (buf[cur] == '-'))
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cur++;
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if (buf[cur] == '\0')
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return FALSE;
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/* we expect a digit now */
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if (!isdigit((unsigned char)buf[cur]))
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return FALSE;
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/* skip digits for the final time */
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while(isdigit((unsigned char)buf[cur]))
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cur++;
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}
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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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/* convert and range check the number...*/
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number = atof(buf);
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if ((min < max) && ((number < min) || (number > max)))
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return FALSE;
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if (asprintf(&new_buf, "%.*f", precision, number) < 0)
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return FALSE;
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/* re-set the field buffer to be the reformatted numeric */
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set_field_buffer(field, 0, new_buf);
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free(new_buf);
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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 numeric, return TRUE if it is.
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*/
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static int
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numeric_check_char(/* ARGSUSED1 */ int c, char *args)
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{
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return ((isdigit(c) || (c == '-') || (c == '+')
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|| (c == '.') || (c == 'e') || (c == 'E')) ? TRUE : FALSE);
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}
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static FIELDTYPE builtin_numeric = {
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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_numeric_args, /* make_args */
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copy_numeric_args, /* copy_args */
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free_numeric_args, /* free_args */
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numeric_check_field, /* field_check */
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numeric_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_NUMERIC = &builtin_numeric;
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