/**
* Check if two versions have a certain relation.
*
* @param a The first version.
* @param rel The relation.
* @param b The second version.
*
* @retval true If the expression “a rel b” is true.
* @retval true If rel is #dpkg_relation_none.
* @retval false Otherwise.
*
* @warning If rel is not a valid relation, this function will terminate
* the program.
*/
bool
dpkg_version_relate(const struct dpkg_version *a,
enum dpkg_relation rel,
const struct dpkg_version *b)
{
int r;
if (rel == dpkg_relation_none)
return true;
r = dpkg_version_compare(a, b);
switch (rel) {
case dpkg_relation_eq:
return r == 0;
case dpkg_relation_lt:
return r < 0;
case dpkg_relation_le:
return r <= 0;
case dpkg_relation_gt:
return r > 0;
case dpkg_relation_ge:
return r >= 0;
default:
internerr("unknown dpkg_relation %d", rel);
}
return false;
}
int
cmpversions(const char *const *argv)
{
struct relationinfo {
const char *string;
/* These values are exit status codes, so 0 = true, 1 = false. */
int if_lesser, if_equal, if_greater;
int if_none_a, if_none_both, if_none_b;
};
static const struct relationinfo relationinfos[]= {
/* < = > !a!2!b */
{ "le", 0,0,1, 0,0,1 },
{ "lt", 0,1,1, 0,1,1 },
{ "eq", 1,0,1, 1,0,1 },
{ "ne", 0,1,0, 0,1,0 },
{ "ge", 1,0,0, 1,0,0 },
{ "gt", 1,1,0, 1,1,0 },
/* These treat an empty version as later than any version. */
{ "le-nl", 0,0,1, 1,0,0 },
{ "lt-nl", 0,1,1, 1,1,0 },
{ "ge-nl", 1,0,0, 0,0,1 },
{ "gt-nl", 1,1,0, 0,1,1 },
/* For compatibility with dpkg control file syntax. */
{ "<", 0,0,1, 0,0,1 },
{ "<=", 0,0,1, 0,0,1 },
{ "<<", 0,1,1, 0,1,1 },
{ "=", 1,0,1, 1,0,1 },
{ ">", 1,0,0, 1,0,0 },
{ ">=", 1,0,0, 1,0,0 },
{ ">>", 1,1,0, 1,1,0 },
{ NULL }
};
const struct relationinfo *rip;
struct dpkg_version a, b;
struct dpkg_error err;
int r;
if (!argv[0] || !argv[1] || !argv[2] || argv[3])
badusage(_("--compare-versions takes three arguments:"
" <version> <relation> <version>"));
for (rip=relationinfos; rip->string && strcmp(rip->string,argv[1]); rip++);
if (!rip->string) badusage(_("--compare-versions bad relation"));
if (*argv[0] && strcmp(argv[0],"<unknown>")) {
if (parseversion(&a, argv[0], &err) < 0) {
if (err.type == DPKG_MSG_WARN)
warning(_("version '%s' has bad syntax: %s"), argv[0], err.str);
else
ohshit(_("version '%s' has bad syntax: %s"), argv[0], err.str);
dpkg_error_destroy(&err);
}
} else {
dpkg_version_blank(&a);
}
if (*argv[2] && strcmp(argv[2],"<unknown>")) {
if (parseversion(&b, argv[2], &err) < 0) {
if (err.type == DPKG_MSG_WARN)
warning(_("version '%s' has bad syntax: %s"), argv[2], err.str);
else
ohshit(_("version '%s' has bad syntax: %s"), argv[2], err.str);
dpkg_error_destroy(&err);
}
} else {
dpkg_version_blank(&b);
}
if (!dpkg_version_is_informative(&a)) {
if (dpkg_version_is_informative(&b))
return rip->if_none_a;
else
return rip->if_none_both;
} else if (!dpkg_version_is_informative(&b)) {
return rip->if_none_b;
}
r = dpkg_version_compare(&a, &b);
debug(dbg_general,"cmpversions a=`%s' b=`%s' r=%d",
versiondescribe(&a,vdew_always),
versiondescribe(&b,vdew_always),
r);
if (r > 0)
return rip->if_greater;
else if (r < 0)
return rip->if_lesser;
else
return rip->if_equal;
}
