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       1                 :             : /*
       2                 :             :  * libdpkg - Debian packaging suite library routines
       3                 :             :  * deb-version.c - deb format version handling routines
       4                 :             :  *
       5                 :             :  * Copyright © 2012-2013 Guillem Jover <guillem@debian.org>
       6                 :             :  *
       7                 :             :  * This 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 2 of the License, or
      10                 :             :  * (at your option) any later version.
      11                 :             :  *
      12                 :             :  * This 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                 :             : 
      21                 :             : #include <config.h>
      22                 :             : #include <compat.h>
      23                 :             : 
      24                 :             : #include <limits.h>
      25                 :             : #include <string.h>
      26                 :             : #include <stdlib.h>
      27                 :             : 
      28                 :             : #include <dpkg/i18n.h>
      29                 :             : #include <dpkg/c-ctype.h>
      30                 :             : #include <dpkg/dpkg.h>
      31                 :             : #include <dpkg/deb-version.h>
      32                 :             : 
      33                 :             : /**
      34                 :             :  * Parse a .deb format version.
      35                 :             :  *
      36                 :             :  * It takes a string and parses a .deb archive format version in the form
      37                 :             :  * of "X.Y", without any leading whitespace, and ending in either a newline
      38                 :             :  * or a NUL. If there is any syntax error a descriptive error string is
      39                 :             :  * returned.
      40                 :             :  *
      41                 :             :  * @param version The version to return.
      42                 :             :  * @param str     The string to parse.
      43                 :             :  *
      44                 :             :  * @return        An error string, or NULL if there was no error.
      45                 :             :  */
      46                 :             : const char *
      47                 :          84 : deb_version_parse(struct deb_version *version, const char *str)
      48                 :             : {
      49                 :             :         const char *str_minor, *end;
      50                 :          84 :         unsigned int major = 0;
      51                 :          84 :         unsigned int minor = 0;
      52                 :          84 :         unsigned int divlimit = INT_MAX / 10;
      53                 :          84 :         int modlimit = INT_MAX % 10;
      54                 :             : 
      55   [ +  +  +  + ]:         189 :         for (end = str; *end && c_isdigit(*end); end++) {
      56                 :         106 :                 int ord = *end - '0';
      57                 :             : 
      58   [ +  -  +  +  :         106 :                 if (major > divlimit || (major == divlimit && ord > modlimit))
                   +  + ]
      59                 :           1 :                         return _("format version with too big major component");
      60                 :             : 
      61                 :         105 :                 major = major * 10  + ord;
      62                 :             :         }
      63                 :             : 
      64         [ +  + ]:          83 :         if (end == str)
      65                 :           5 :                 return _("format version with empty major component");
      66         [ +  + ]:          78 :         if (*end != '.')
      67                 :           2 :                 return _("format version has no dot");
      68                 :             : 
      69   [ +  +  +  + ]:         221 :         for (end = str_minor = end + 1; *end && c_isdigit(*end); end++) {
      70                 :         145 :                 int ord = *end - '0';
      71                 :             : 
      72   [ +  -  -  +  :         145 :                 if (minor > divlimit || (minor == divlimit && ord > modlimit))
                   -  - ]
      73                 :           0 :                         return _("format version with too big minor component");
      74                 :             : 
      75                 :         145 :                 minor = minor * 10 + ord;
      76                 :             :         }
      77                 :             : 
      78         [ +  + ]:          76 :         if (end == str_minor)
      79                 :           1 :                 return _("format version with empty minor component");
      80   [ +  +  +  + ]:          75 :         if (*end != '\n' && *end != '\0')
      81                 :           1 :                 return _("format version followed by junk");
      82                 :             : 
      83                 :          74 :         version->major = major;
      84                 :          74 :         version->minor = minor;
      85                 :             : 
      86                 :          74 :         return NULL;
      87                 :             : }