mirror of https://github.com/pygos/pkg-utils.git
80 lines
1.4 KiB
C
80 lines
1.4 KiB
C
/* SPDX-License-Identifier: ISC */
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#include "install.h"
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static void remove_dependency(struct pkg_dep_list *list,
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struct pkg_dep_node *pkg)
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{
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struct pkg_dep_node *it;
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size_t i;
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for (it = list->head; it != NULL; it = it->next) {
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for (i = 0; i < it->num_deps; ++i) {
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if (it->deps[i] == pkg) {
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it->deps[i] = it->deps[it->num_deps - 1];
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it->num_deps -= 1;
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--i;
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}
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}
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if (it->num_deps == 0 && it->deps != NULL) {
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free(it->deps);
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it->deps = NULL;
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}
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}
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}
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static void append(struct pkg_dep_list *out, struct pkg_dep_node *pkg)
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{
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if (out->tail == NULL) {
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out->head = out->tail = pkg;
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} else {
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out->tail->next = pkg;
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out->tail = pkg;
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}
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}
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static struct pkg_dep_node *remove_no_deps(struct pkg_dep_list *list)
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{
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struct pkg_dep_node *it = list->head, *prev = NULL;
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while (it != NULL && it->num_deps != 0) {
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prev = it;
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it = it->next;
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}
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if (it != NULL) {
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if (prev == NULL) {
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list->head = it->next;
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} else {
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prev->next = it->next;
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}
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if (it == list->tail)
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list->tail = prev;
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}
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return it;
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}
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int sort_by_dependencies(struct pkg_dep_list *list)
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{
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struct pkg_dep_list result = { NULL, NULL };
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struct pkg_dep_node *pkg;
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while (list->head != NULL) {
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pkg = remove_no_deps(list);
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if (pkg == NULL) {
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fputs("cycle detected in dependency graph\n", stderr);
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pkg_list_cleanup(&result);
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return -1;
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}
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remove_dependency(list, pkg);
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append(&result, pkg);
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}
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*list = result;
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return 0;
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}
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