int _alpm_depcmp(alpm_pkg_t *pkg, alpm_depend_t *dep)
{
alpm_list_t *i;
int satisfy = _alpm_depcmp_literal(pkg, dep);
if(satisfy) {
return satisfy;
}
/* check provisions, name and version if available */
for(i = alpm_pkg_get_provides(pkg); i && !satisfy; i = i->next) {
alpm_depend_t *provision = i->data;
if(dep->mod == ALPM_DEP_MOD_ANY) {
/* any version will satisfy the requirement */
satisfy = (provision->name_hash == dep->name_hash
&& strcmp(provision->name, dep->name) == 0);
} else if(provision->mod == ALPM_DEP_MOD_EQ) {
/* provision specifies a version, so try it out */
satisfy = (provision->name_hash == dep->name_hash
&& strcmp(provision->name, dep->name) == 0
&& dep_vercmp(provision->version, dep->mod, dep->version));
}
}
return satisfy;
}
int _alpm_depcmp_literal(alpm_pkg_t *pkg, alpm_depend_t *dep)
{
if(pkg->name_hash != dep->name_hash
|| strcmp(pkg->name, dep->name) != 0) {
/* skip more expensive checks */
return 0;
}
return dep_vercmp(pkg->version, dep->mod, dep->version);
}
int _alpm_depcmp(pmpkg_t *pkg, pmdepend_t *dep)
{
alpm_list_t *i;
int satisfy = 0;
/* check (pkg->name, pkg->version) */
if(pkg->name_hash && dep->name_hash
&& pkg->name_hash != dep->name_hash) {
/* skip more expensive checks */
} else {
satisfy = (strcmp(pkg->name, dep->name) == 0
&& dep_vercmp(pkg->version, dep->mod, dep->version));
if(satisfy) {
return satisfy;
}
}
/* check provisions, format : "name=version" */
for(i = alpm_pkg_get_provides(pkg); i && !satisfy; i = i->next) {
const char *provision = i->data;
const char *provver = strchr(provision, '=');
if(provver == NULL) { /* no provision version */
satisfy = (dep->mod == PM_DEP_MOD_ANY
&& strcmp(provision, dep->name) == 0);
} else {
/* This is a bit tricker than the old code for performance reasons. To
* prevent the need to copy and duplicate strings, strncmp only the name
* portion if they are the same length, since there is a version and
* operator in play here. Cast is to silence sign conversion warning;
* we know provver >= provision if we are here. */
size_t namelen = (size_t)(provver - provision);
provver += 1;
satisfy = (strlen(dep->name) == namelen
&& strncmp(provision, dep->name, namelen) == 0
&& dep_vercmp(provver, dep->mod, dep->version));
}
}
return satisfy;
}
