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/*
* Copyright 2005-2018 Gentoo Foundation
* Distributed under the terms of the GNU General Public License v2
*
* Copyright 2005-2008 Ned Ludd - <solar@gentoo.org>
* Copyright 2005-2014 Mike Frysinger - <vapier@gentoo.org>
*/
static const char * const booga[] = {"!!!", "!=", "==", ">", "<"};
enum { ERROR=0, NOT_EQUAL, EQUAL, NEWER, OLDER };
static int
_atom_compare_match(int ret, atom_operator op)
{
if (op == ATOM_OP_NONE)
return ret;
#define E(x) ((x) ? EQUAL : NOT_EQUAL)
switch (op) {
case ATOM_OP_NEWER:
return E(ret == NEWER);
case ATOM_OP_NEWER_EQUAL:
return E(ret != OLDER);
case ATOM_OP_PV_EQUAL: /* we handled this in atom_compare */
case ATOM_OP_EQUAL:
return E(ret == EQUAL);
case ATOM_OP_OLDER_EQUAL:
return E(ret != NEWER);
case ATOM_OP_OLDER:
return E(ret == OLDER);
default:
/* blockers/etc... */
return NOT_EQUAL;
}
#undef E
}
/* a1 <return value> a2
* foo-1 <EQUAL> foo-1
* foo-1 <OLDER> foo-2
* foo-1 <NOT_EQUAL> bar-1
*/
static int
atom_compare(const depend_atom *a1, const depend_atom *a2)
{
/* sanity check that at most one has operators */
if (a1->pfx_op != ATOM_OP_NONE || a1->sfx_op != ATOM_OP_NONE) {
/* this is bogus, so punt it */
if (a2->pfx_op != ATOM_OP_NONE || a2->sfx_op != ATOM_OP_NONE)
return NOT_EQUAL;
/* swap a1 & a2 so that a2 is the atom with operators */
const depend_atom *as = a2;
a2 = a1;
a1 = as;
}
atom_operator pfx_op = a2->pfx_op;
atom_operator sfx_op = a2->sfx_op;
/* check slot */
if (a1->SLOT || a2->SLOT) {
if (!a1->SLOT || !a2->SLOT || strcmp(a1->SLOT, a2->SLOT))
return NOT_EQUAL;
}
/* check repo */
if (a1->REPO || a2->REPO) {
if (!a1->REPO || !a2->REPO || strcmp(a1->REPO, a2->REPO))
return NOT_EQUAL;
}
/* Check category, iff both are specified. This way we can match
* atoms like "sys-devel/gcc" and "gcc".
*/
if (a1->CATEGORY && a2->CATEGORY) {
if (strcmp(a1->CATEGORY, a2->CATEGORY))
return NOT_EQUAL;
}
/* check name */
if (a1->PN && a2->PN) {
if (strcmp(a1->PN, a2->PN))
return NOT_EQUAL;
} else if (a1->PN || a2->PN)
return NOT_EQUAL;
/* in order to handle suffix globs, we need to know all of the
* version elements provided in it ahead of time
*/
unsigned int ver_bits = 0;
if (sfx_op == ATOM_OP_STAR) {
if (a2->letter)
ver_bits |= (1 << 0);
if (a2->suffixes[0].suffix != VER_NORM)
ver_bits |= (1 << 1);
/* This doesn't handle things like foo-1.0-r0*, but that atom
* doesn't ever show up in practice, so who cares.
*/
if (a2->PR_int)
ver_bits |= (1 << 2);
}
/* check version */
if (a1->PV && a2->PV) {
char *s1, *s2;
uint64_t n1, n2;
/* first we compare the version [1.0]z_alpha1 */
s1 = a1->PV;
s2 = a2->PV;
while (s1 || s2) {
if (s1 && s2) {
/* deal with leading zeros */
while (*s1 == '0' && *s2 == '0') {
++s1;
++s2;
}
if (*s1 == '0' && isdigit(*s2))
return _atom_compare_match(OLDER, pfx_op);
else if (*s2 == '0' && isdigit(*s1))
return _atom_compare_match(NEWER, pfx_op);
} else if (sfx_op == ATOM_OP_STAR && !s2 && !ver_bits)
return _atom_compare_match(EQUAL, pfx_op);
n1 = (s1 ? atoll(s1) : 0);
n2 = (s2 ? atoll(s2) : 0);
if (n1 < n2)
return _atom_compare_match(OLDER, pfx_op);
else if (n1 > n2)
return _atom_compare_match(NEWER, pfx_op);
if (s1) {
s1 = strchr(s1, '.');
if (s1) ++s1;
}
if (s2) {
s2 = strchr(s2, '.');
if (s2) ++s2;
}
}
/* compare trailing letter 1.0[z]_alpha1 */
if (sfx_op == ATOM_OP_STAR) {
ver_bits >>= 1;
if (!a2->letter && !ver_bits)
return _atom_compare_match(EQUAL, pfx_op);
}
if (a1->letter < a2->letter)
return _atom_compare_match(OLDER, pfx_op);
if (a1->letter > a2->letter)
return _atom_compare_match(NEWER, pfx_op);
/* find differing suffixes 1.0z[_alpha1] */
const atom_suffix *as1 = &a1->suffixes[0];
const atom_suffix *as2 = &a2->suffixes[0];
while (as1->suffix == as2->suffix) {
if (as1->suffix == VER_NORM ||
as2->suffix == VER_NORM)
break;
if (as1->sint != as2->sint)
break;
++as1;
++as2;
}
/* compare suffixes 1.0z[_alpha]1 */
if (sfx_op == ATOM_OP_STAR) {
ver_bits >>= 1;
if (as2->suffix == VER_NORM && !ver_bits)
return _atom_compare_match(EQUAL, pfx_op);
}
if (as1->suffix < as2->suffix)
return _atom_compare_match(OLDER, pfx_op);
else if (as1->suffix > as2->suffix)
return _atom_compare_match(NEWER, pfx_op);
/* compare suffix number 1.0z_alpha[1] */
if (sfx_op == ATOM_OP_STAR && !as2->sint && !ver_bits)
return _atom_compare_match(EQUAL, pfx_op);
else if (as1->sint < as2->sint)
return _atom_compare_match(OLDER, pfx_op);
else if (as1->sint > as2->sint)
return _atom_compare_match(NEWER, pfx_op);
/* fall through to -r# check below */
} else if (a1->PV || a2->PV)
return EQUAL;
/* Make sure the -r# is the same. */
if ((sfx_op == ATOM_OP_STAR && !a2->PR_int) ||
pfx_op == ATOM_OP_PV_EQUAL ||
a1->PR_int == a2->PR_int)
return _atom_compare_match(EQUAL, pfx_op);
else if (a1->PR_int < a2->PR_int)
return _atom_compare_match(OLDER, pfx_op);
else
return _atom_compare_match(NEWER, pfx_op);
}
static int
atom_compare_str(const char * const s1, const char * const s2)
{
depend_atom *a1, *a2;
int ret = ERROR;
a1 = atom_explode(s1);
if (!a1)
return ret;
a2 = atom_explode(s2);
if (!a2)
goto implode_a1_ret;
ret = atom_compare(a1, a2);
atom_implode(a2);
implode_a1_ret:
atom_implode(a1);
return ret;
}
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