lib_internal/util-isnumber.hc

   1 // $Id: util-isnumber.hc 2255 2006-01-22 11:23:47Z ensc $    --*- c -*--
   2
   3 // Copyright (C) 2006 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
   4 //
   5 // This program is free software; you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation; version 2 of the License.
   8 //
   9 // This program is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with this program; if not, write to the Free Software
  16 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17
  18 #include <stdbool.h>
  19 #include <stdlib.h>
  20 #include <errno.h>
  21
  22 #define ENSC_DECL_UTIL_ISNUMBER(NAME,TYPE,FUNC)                 \
  23   bool                                                          \
  24   NAME(char const *str, TYPE *result, bool is_strict)           \
  25   {                                                             \
  26     char *              errptr;                                 \
  27     TYPE                val;                                    \
  28     unsigned int        fac = 1;                                \
  29                                                                 \
  30     errno = 0;                                                  \
  31     val   = FUNC(str, &errptr, 0);                              \
  32     if (errno==ERANGE)                                          \
  33       return false;                                             \
  34     if (errptr!=str && !is_strict) {                            \
  35       switch (*errptr) {                                        \
  36         case 'M'        :  fac *= 1024; /* fallthrough */       \
  37         case 'K'        :  fac *= 1024; ++errptr; break;        \
  38         case 'm'        :  fac *= 1000; /* fallthrough */       \
  39         case 'k'        :  fac *= 1000; ++errptr; break;        \
  40         default :  break;                                       \
  41       }                                                         \
  42     }                                                           \
  43     if (!checkConstraints(val,fac))                             \
  44       return false;                                             \
  45                                                                 \
  46     if (*errptr!='\0' || errptr==str)                           \
  47       return false;                                             \
  48     else {                                                      \
  49       if (result) *result = val*fac;                            \
  50       return true;                                              \
  51     }                                                           \
  52   }