1/*	$NetBSD: type_numeric.c,v 1.10 2021/04/13 13:13:04 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1998-1999 Brett Lymn
5 *                         (blymn@baea.com.au, brett_lymn@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_numeric.c,v 1.10 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 numeric type handling.
43 */
44
45typedef struct
46{
47	unsigned precision;
48	double min;
49	double max;
50} numeric_args;
51
52/*
53 * Create the numeric arguments structure from the given args.  Return NULL
54 * if the call fails, otherwise return a pointer to the structure allocated.
55 */
56static char *
57create_numeric_args(va_list *args)
58{
59	numeric_args *new;
60
61	new = malloc(sizeof(*new));
62
63	if (new != NULL) {
64		new->precision = va_arg(*args, unsigned);
65		new->min = va_arg(*args, double);
66		new->max = va_arg(*args, double);
67	}
68
69	return (void *) new;
70}
71
72/*
73 * Copy the numeric argument structure.
74 */
75static char *
76copy_numeric_args(char *args)
77{
78	numeric_args *new;
79
80	new = malloc(sizeof(*new));
81
82	if (new != NULL)
83		memcpy(new, args, sizeof(*args));
84
85	return (void *) new;
86}
87
88/*
89 * Free the allocated storage associated with the type arguments.
90 */
91static void
92free_numeric_args(char *args)
93{
94	if (args != NULL)
95		free(args);
96}
97
98/*
99 * Check the contents of the field buffer are numeric only.  A valid
100 * number is of the form nnnn[.mmmmm][Ee[+-]ddd]
101 */
102static int
103numeric_check_field(FIELD *field, char *args)
104{
105	int cur;
106	double number, max, min;
107	int precision;
108	char *buf, *new_buf;
109
110	if (args == NULL)
111		return FALSE;
112
113	precision = ((numeric_args *) (void *) field->args)->precision;
114	min = ((numeric_args *) (void *) field->args)->min;
115	max = ((numeric_args *) (void *) field->args)->max;
116
117	buf = args;
118	cur = 0;
119
120	  /* skip leading white space */
121	while ((buf[cur] != '\0')
122	       && ((buf[cur] == ' ') || (buf[cur] == '\t')))
123		cur++;
124
125	  /* no good if we have hit the end */
126	if (buf[cur] == '\0')
127		return FALSE;
128
129	  /* find the end of the digits but allow a leading + or - sign, and
130	   * a decimal point.
131	   */
132	if ((buf[cur] == '-') || (buf[cur] == '+'))
133		cur++;
134
135	while(isdigit((unsigned char)buf[cur]))
136		cur++;
137
138	  /* if not at end of string then check for decimal... */
139	if (buf[cur] == '.') {
140		cur++;
141		/* check for more digits now.... */
142		while (buf[cur] && isdigit((unsigned char)buf[cur]))
143			cur++;
144	}
145
146	  /* check for an exponent */
147	if ((buf[cur] == 'E') || (buf[cur] == 'e')) {
148		cur++;
149		if (buf[cur] == '\0')
150			return FALSE;
151
152		  /* allow a + or a - for exponent */
153		if ((buf[cur] == '+') || (buf[cur] == '-'))
154			cur++;
155
156		if (buf[cur] == '\0')
157			return FALSE;
158
159		  /* we expect a digit now */
160		if (!isdigit((unsigned char)buf[cur]))
161			return FALSE;
162
163		  /* skip digits for the final time */
164		while(isdigit((unsigned char)buf[cur]))
165			cur++;
166	}
167
168	  /* check there is only trailing whitespace */
169	while ((buf[cur] != '\0')
170	       && ((buf[cur] == ' ') || (buf[cur] == '\t')))
171		cur++;
172
173	  /* no good if we are not at the end of the string */
174	if (buf[cur] != '\0')
175		return FALSE;
176
177	  /* convert and range check the number...*/
178	number = atof(buf);
179	if ((min < max) && ((number < min) || (number > max)))
180		return FALSE;
181
182	if (asprintf(&new_buf, "%.*f", precision, number) < 0)
183		return FALSE;
184
185	  /* re-set the field buffer to be the reformatted numeric */
186	set_field_buffer(field, 0, new_buf);
187
188	free(new_buf);
189
190	  /* otherwise all was ok */
191	return TRUE;
192}
193
194/*
195 * Check the given character is numeric, return TRUE if it is.
196 */
197static int
198numeric_check_char(/* ARGSUSED1 */ int c, char *args)
199{
200	return ((isdigit(c) || (c == '-') || (c == '+')
201		 || (c == '.') || (c == 'e') || (c == 'E')) ? TRUE : FALSE);
202}
203
204static FIELDTYPE builtin_numeric = {
205	_TYPE_HAS_ARGS | _TYPE_IS_BUILTIN,  /* flags */
206	0,                                  /* refcount */
207	NULL,                               /* link */
208	create_numeric_args,                  /* make_args */
209	copy_numeric_args,                    /* copy_args */
210	free_numeric_args,                    /* free_args */
211	numeric_check_field,                  /* field_check */
212	numeric_check_char,                   /* char_check */
213	NULL,                               /* next_choice */
214	NULL                                /* prev_choice */
215};
216
217FIELDTYPE *TYPE_NUMERIC = &builtin_numeric;
218
219
220