Home | History | Annotate | Line # | Download | only in libform 
      1 /*	$NetBSD: type_integer.c,v 1.9 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_integer.c,v 1.9 2021/04/13 13:13:04 christos Exp $");
     34 
     35 #include <stdlib.h>
     36 #include <strings.h>
     37 #include <ctype.h>
     38 #include "form.h"
     39 #include "internals.h"
     40 
     41 /*
     42  * The integer type handling.
     43  */
     44 
     45 typedef struct
     46 {
     47 	unsigned precision;
     48 	long min;
     49 	long max;
     50 } integer_args;
     51 
     52 /*
     53  * Create the integer arguments structure from the given args.  Return NULL
     54  * if the call fails, otherwise return a pointer to the structure allocated.
     55  */
     56 static char *
     57 create_integer_args(va_list *args)
     58 {
     59 	integer_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, long);
     66 		new->max = va_arg(*args, long);
     67 	}
     68 
     69 	return (void *) new;
     70 }
     71 
     72 /*
     73  * Copy the integer argument structure.
     74  */
     75 static char *
     76 copy_integer_args(char *args)
     77 {
     78 	integer_args *new;
     79 
     80 	new = malloc(sizeof(*new));
     81 
     82 	if (new != NULL)
     83 		memcpy(new, args, sizeof(*new));
     84 
     85 	return (void *) new;
     86 }
     87 
     88 /*
     89  * Free the allocated storage associated with the type arguments.
     90  */
     91 static void
     92 free_integer_args(char *args)
     93 {
     94 	if (args != NULL)
     95 		free(args);
     96 }
     97 
     98 /*
     99  * Check the contents of the field buffer are digits only.
    100  */
    101 static int
    102 integer_check_field(FIELD *field, char *args)
    103 {
    104 	int cur;
    105 	long number, max, min;
    106 	int precision;
    107 	char *buf, *new_buf;
    108 
    109 	if (args == NULL)
    110 		return FALSE;
    111 
    112 	precision = ((integer_args *) (void *) field->args)->precision;
    113 	min = ((integer_args *) (void *) field->args)->min;
    114 	max = ((integer_args *) (void *) field->args)->max;
    115 
    116 	buf = args;
    117 	cur = 0;
    118 
    119 	  /* skip leading white space */
    120 	while ((buf[cur] != '\0')
    121 	       && ((buf[cur] == ' ') || (buf[cur] == '\t')))
    122 		cur++;
    123 
    124 	  /* no good if we have hit the end */
    125 	if (buf[cur] == '\0')
    126 		return FALSE;
    127 
    128 	  /* find the end of the digits but allow a leading + or - sign */
    129 	if ((buf[cur] == '-') || (buf[cur] == '+'))
    130 		cur++;
    131 
    132 	while(isdigit((unsigned char)buf[cur]))
    133 		cur++;
    134 
    135 	  /* check there is only trailing whitespace */
    136 	while ((buf[cur] != '\0')
    137 	       && ((buf[cur] == ' ') || (buf[cur] == '\t')))
    138 		cur++;
    139 
    140 	  /* no good if we are not at the end of the string */
    141 	if (buf[cur] != '\0')
    142 		return FALSE;
    143 
    144 	  /* convert and range check the number...*/
    145 	number = atol(buf);
    146 	if ((min > max) || ((number < min) || (number > max)))
    147 		return FALSE;
    148 
    149 	if (asprintf(&new_buf, "%.*ld", precision, number) < 0)
    150 		return FALSE;
    151 
    152 	  /* re-set the field buffer to be the reformatted numeric */
    153 	set_field_buffer(field, 0, new_buf);
    154 
    155 	free(new_buf);
    156 
    157 	  /* otherwise all was ok */
    158 	return TRUE;
    159 }
    160 
    161 /*
    162  * Check the given character is numeric, return TRUE if it is.
    163  */
    164 static int
    165 integer_check_char(/* ARGSUSED1 */ int c, char *args)
    166 {
    167 	return ((isdigit(c) || (c == '-') || (c == '+')) ? TRUE : FALSE);
    168 }
    169 
    170 static FIELDTYPE builtin_integer = {
    171 	_TYPE_HAS_ARGS | _TYPE_IS_BUILTIN,  /* flags */
    172 	0,                                  /* refcount */
    173 	NULL,                               /* link */
    174 	create_integer_args,                  /* make_args */
    175 	copy_integer_args,                    /* copy_args */
    176 	free_integer_args,                    /* free_args */
    177 	integer_check_field,                  /* field_check */
    178 	integer_check_char,                   /* char_check */
    179 	NULL,                               /* next_choice */
    180 	NULL                                /* prev_choice */
    181 };
    182 
    183 FIELDTYPE *TYPE_INTEGER = &builtin_integer;
    184 
    185 
    186