libmount/src/version.c

   1 /*
   2  * version.c - Return the version of the blkid library
   3  *
   4  * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
   5  * [Based on libblkid/version.c by Theodore Ts'o]
   6  *
   7  * See COPYING.libmount for the License of this software.
   8  */
   9
  10 /**
  11  * SECTION: version
  12  * @title: Version functions
  13  * @short_description: functions to get library version.
  14  */
  15
  16 #include <ctype.h>
  17
  18 #include "mountP.h"
  19
  20 static const char *lib_version = LIBMOUNT_VERSION;
  21 static const char *lib_features[] = {
  22 #ifdef HAVE_LIBSELINUX
  23         "selinux",
  24 #endif
  25 #ifdef CONFIG_LIBMOUNT_DEBUG
  26         "debug",
  27 #endif
  28 #ifdef CONFIG_LIBMOUNT_ASSERT
  29         "assert",
  30 #endif
  31         NULL
  32 };
  33
  34 /**
  35  * mnt_parse_version_string:
  36  * @ver_string: version string (e.g "2.18.0")
  37  *
  38  * Returns: release version code.
  39  */
  40 int mnt_parse_version_string(const char *ver_string)
  41 {
  42         const char *cp;
  43         int version = 0;
  44
  45         assert(ver_string);
  46
  47         for (cp = ver_string; *cp; cp++) {
  48                 if (*cp == '.')
  49                         continue;
  50                 if (!isdigit(*cp))
  51                         break;
  52                 version = (version * 10) + (*cp - '0');
  53         }
  54         return version;
  55 }
  56
  57 /**
  58  * mnt_get_library_version:
  59  * @ver_string: return pointer to the static library version string if not NULL
  60  *
  61  * Returns: release version number.
  62  */
  63 int mnt_get_library_version(const char **ver_string)
  64 {
  65         if (ver_string)
  66                 *ver_string = lib_version;
  67
  68         return mnt_parse_version_string(lib_version);
  69 }
  70
  71 /**
  72  * mnt_get_library_features:
  73  * @features: returns pointer to the static array of strings, the array is
  74  *            terminated by NULL.
  75  *
  76  * Returns: number of items in the features array not including the last NULL,
  77  *          or less then zero in case of error
  78  *
  79  * Example:
  80  * <informalexample>
  81  *   <programlisting>
  82  *      const char *features;
  83  *
  84  *      mnt_get_library_features(&features);
  85  *      while (features && *features)
  86  *              printf("%s\n", *features++);
  87  *   </programlisting>
  88  * </informalexample>
  89  *
  90  */
  91 int mnt_get_library_features(const char ***features)
  92 {
  93         if (!features)
  94                 return -EINVAL;
  95
  96         *features = lib_features;
  97         return ARRAY_SIZE(lib_features) - 1;
  98 }
  99
 100 #ifdef TEST_PROGRAM
 101 int test_version(struct libmnt_test *ts, int argc, char *argv[])
 102 {
 103         const char *ver;
 104         const char **features;
 105
 106         mnt_get_library_version(&ver);
 107
 108         printf("Library version: %s\n", ver);
 109         printf("Library API version: " LIBMOUNT_VERSION "\n");
 110         printf("Library features:");
 111
 112         mnt_get_library_features(&features);
 113         while (features && *features)
 114                 printf(" %s", *features++);
 115
 116         if (mnt_get_library_version(NULL) ==
 117                         mnt_parse_version_string(LIBMOUNT_VERSION))
 118                 return 0;
 119
 120         return -1;
 121 }
 122
 123 int main(int argc, char *argv[])
 124 {
 125         struct libmnt_test ts[] = {
 126                 { "--print", test_version, "print versions" },
 127                 { NULL }
 128         };
 129
 130         return mnt_run_test(ts, argc, argv);
 131 }
 132 #endif