lib/libform/type_integer.c

   1 /*      $NetBSD: type_integer.c,v 1.8 2004/10/28 21:14:52 dsl 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_integer.c,v 1.8 2004/10/28 21:14:52 dsl 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 = (integer_args *) malloc(sizeof(integer_args));
  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 = (integer_args *) malloc(sizeof(integer_args));
  81
  82         if (new != NULL)
  83                 bcopy(args, new, sizeof(integer_args));
  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