lib/dpkg/deb-version.c

   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 deb_version_parse(struct deb_version *version, const char *str)
  48 {
  49         const char *str_minor, *end;
  50         unsigned int major = 0;
  51         unsigned int minor = 0;
  52         unsigned int divlimit = INT_MAX / 10;
  53         int modlimit = INT_MAX % 10;
  54
  55         for (end = str; *end && c_isdigit(*end); end++) {
  56                 int ord = *end - '0';
  57
  58                 if (major > divlimit || (major == divlimit && ord > modlimit))
  59                         return _("format version with too big major component");
  60
  61                 major = major * 10  + ord;
  62         }
  63
  64         if (end == str)
  65                 return _("format version with empty major component");
  66         if (*end != '.')
  67                 return _("format version has no dot");
  68
  69         for (end = str_minor = end + 1; *end && c_isdigit(*end); end++) {
  70                 int ord = *end - '0';
  71
  72                 if (minor > divlimit || (minor == divlimit && ord > modlimit))
  73                         return _("format version with too big minor component");
  74
  75                 minor = minor * 10 + ord;
  76         }
  77
  78         if (end == str_minor)
  79                 return _("format version with empty minor component");
  80         if (*end != '\n' && *end != '\0')
  81                 return _("format version followed by junk");
  82
  83         version->major = major;
  84         version->minor = minor;
  85
  86         return NULL;
  87 }