lib/libform/type_numeric.c

   1 /*      $NetBSD: type_numeric.c,v 1.7 2004/10/27 19:59:24 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_numeric.c,v 1.7 2004/10/27 19:59:24 dsl 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
  45 typedef 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  */
  56 static char *
  57 create_numeric_args(va_list *args)
  58 {
  59         numeric_args *new;
  60
  61         new = (numeric_args *) malloc(sizeof(numeric_args));
  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  */
  75 static char *
  76 copy_numeric_args(char *args)
  77 {
  78         numeric_args *new;
  79
  80         new = (numeric_args *) malloc(sizeof(numeric_args));
  81
  82         if (new != NULL)
  83                 bcopy(args, new, sizeof(numeric_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_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  */
 102 static int
 103 numeric_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] != '\0') && (buf[cur] == '.')) {
 140                 cur++;
 141                   /* check for more digits now.... */
 142                 while(isdigit((unsigned char)buf[cur]))
 143                         cur++;
 144         }
 145
 146           /* check for an exponent */
 147         if ((buf[cur] != '\0') &&
 148             ((buf[cur] == 'E') || (buf[cur] == 'e'))) {
 149                 cur++;
 150                 if (buf[cur] == '\0')
 151                         return FALSE;
 152
 153                   /* allow a + or a - for exponent */
 154                 if ((buf[cur] == '+') || (buf[cur] == '-'))
 155                         cur++;
 156
 157                 if (buf[cur] == '\0')
 158                         return FALSE;
 159
 160                   /* we expect a digit now */
 161                 if (!isdigit((unsigned char)buf[cur]))
 162                         return FALSE;
 163
 164                   /* skip digits for the final time */
 165                 while(isdigit((unsigned char)buf[cur]))
 166                         cur++;
 167         }
 168
 169           /* check there is only trailing whitespace */
 170         while ((buf[cur] != '\0')
 171                && ((buf[cur] == ' ') || (buf[cur] == '\t')))
 172                 cur++;
 173
 174           /* no good if we are not at the end of the string */
 175         if (buf[cur] != '\0')
 176                 return FALSE;
 177
 178           /* convert and range check the number...*/
 179         number = atof(buf);
 180         if ((min < max) && ((number < min) || (number > max)))
 181                 return FALSE;
 182
 183         if (asprintf(&new_buf, "%.*f", precision, number) < 0)
 184                 return FALSE;
 185
 186           /* re-set the field buffer to be the reformatted numeric */
 187         set_field_buffer(field, 0, new_buf);
 188
 189         free(new_buf);
 190
 191           /* otherwise all was ok */
 192         return TRUE;
 193 }
 194
 195 /*
 196  * Check the given character is numeric, return TRUE if it is.
 197  */
 198 static int
 199 numeric_check_char(/* ARGSUSED1 */ int c, char *args)
 200 {
 201         return ((isdigit(c) || (c == '-') || (c == '+')
 202                  || (c == '.') || (c == 'e') || (c == 'E')) ? TRUE : FALSE);
 203 }
 204
 205 static FIELDTYPE builtin_numeric = {
 206         _TYPE_HAS_ARGS | _TYPE_IS_BUILTIN,  /* flags */
 207         0,                                  /* refcount */
 208         NULL,                               /* link */
 209         create_numeric_args,                  /* make_args */
 210         copy_numeric_args,                    /* copy_args */
 211         free_numeric_args,                    /* free_args */
 212         numeric_check_field,                  /* field_check */
 213         numeric_check_char,                   /* char_check */
 214         NULL,                               /* next_choice */
 215         NULL                                /* prev_choice */
 216 };
 217
 218 FIELDTYPE *TYPE_NUMERIC = &builtin_numeric;
 219
 220