src/strversion.c

   1 /* Convert version string to int.
   2
   3    Copyright (C) 2020-2021 Free Software Foundation, Inc.
   4
   5    This file is part of Bison, the GNU Compiler Compiler.
   6
   7    This program is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  19
  20 #include <config.h>
  21 #include "system.h"
  22
  23 #include "strversion.h"
  24
  25 #include <errno.h>
  26 #include <intprops.h>
  27
  28 int
  29 strversion_to_int (char const *version)
  30 {
  31   IGNORE_TYPE_LIMITS_BEGIN
  32   int res = 0;
  33   errno = 0;
  34   char *cp = NULL;
  35
  36   {
  37     long major = strtol (version, &cp, 10);
  38     if (errno || cp == version || *cp != '.' || major < 0
  39         || INT_MULTIPLY_WRAPV (major, 10000, &res))
  40       return -1;
  41   }
  42
  43   {
  44     ++cp;
  45     char *prev = cp;
  46     long minor = strtol (cp, &cp, 10);
  47     if (errno || cp == prev || (*cp != '\0' && *cp != '.')
  48         || ! (0 <= minor && minor < 100)
  49         || INT_MULTIPLY_WRAPV (minor, 100, &minor)
  50         || INT_ADD_WRAPV (minor, res, &res))
  51       return -1;
  52   }
  53
  54   if (*cp == '.')
  55     {
  56       ++cp;
  57       char *prev = cp;
  58       long micro = strtol (cp, &cp, 10);
  59       if (errno || cp == prev || (*cp != '\0' && *cp != '.')
  60           || ! (0 <= micro && micro < 100)
  61           || INT_ADD_WRAPV (micro, res, &res))
  62         return -1;
  63     }
  64
  65   IGNORE_TYPE_LIMITS_END
  66   return res;
  67 }