812666c8e6
Introduce xmalloc and xrealloc to die gracefully with a descriptive message when out of memory, rather than taking a SIGSEGV. Signed-off-by: Christopher Li<chrislgit@chrisli.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
#include "commit.h"
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#include "cache.h"
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#include <string.h>
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#include <limits.h>
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const char *commit_type = "commit";
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struct commit *lookup_commit(unsigned char *sha1)
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{
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struct object *obj = lookup_object(sha1);
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if (!obj) {
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struct commit *ret = xmalloc(sizeof(struct commit));
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memset(ret, 0, sizeof(struct commit));
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created_object(sha1, &ret->object);
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ret->object.type = commit_type;
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return ret;
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}
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if (obj->type != commit_type) {
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error("Object %s is a %s, not a commit",
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sha1_to_hex(sha1), obj->type);
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return NULL;
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}
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return (struct commit *) obj;
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}
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static unsigned long parse_commit_date(const char *buf)
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{
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unsigned long date;
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if (memcmp(buf, "author", 6))
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return 0;
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while (*buf++ != '\n')
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/* nada */;
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if (memcmp(buf, "committer", 9))
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return 0;
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while (*buf++ != '>')
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/* nada */;
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date = strtoul(buf, NULL, 10);
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if (date == ULONG_MAX)
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date = 0;
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return date;
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}
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int parse_commit(struct commit *item)
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{
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char type[20];
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void * buffer, *bufptr;
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unsigned long size;
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unsigned char parent[20];
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if (item->object.parsed)
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return 0;
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item->object.parsed = 1;
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buffer = bufptr = read_sha1_file(item->object.sha1, type, &size);
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if (!buffer)
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return error("Could not read %s",
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sha1_to_hex(item->object.sha1));
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if (strcmp(type, commit_type))
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return error("Object %s not a commit",
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sha1_to_hex(item->object.sha1));
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get_sha1_hex(bufptr + 5, parent);
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item->tree = lookup_tree(parent);
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if (item->tree)
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add_ref(&item->object, &item->tree->object);
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bufptr += 46; /* "tree " + "hex sha1" + "\n" */
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while (!memcmp(bufptr, "parent ", 7) &&
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!get_sha1_hex(bufptr + 7, parent)) {
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struct commit *new_parent = lookup_commit(parent);
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if (new_parent) {
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commit_list_insert(new_parent, &item->parents);
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add_ref(&item->object, &new_parent->object);
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}
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bufptr += 48;
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}
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item->date = parse_commit_date(bufptr);
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free(buffer);
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return 0;
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}
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void commit_list_insert(struct commit *item, struct commit_list **list_p)
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{
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struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
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new_list->item = item;
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new_list->next = *list_p;
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*list_p = new_list;
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}
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void free_commit_list(struct commit_list *list)
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{
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while (list) {
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struct commit_list *temp = list;
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list = temp->next;
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free(temp);
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}
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}
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static void insert_by_date(struct commit_list **list, struct commit *item)
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{
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struct commit_list **pp = list;
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struct commit_list *p;
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while ((p = *pp) != NULL) {
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if (p->item->date < item->date) {
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break;
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}
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pp = &p->next;
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}
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commit_list_insert(item, pp);
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}
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void sort_by_date(struct commit_list **list)
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{
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struct commit_list *ret = NULL;
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while (*list) {
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insert_by_date(&ret, (*list)->item);
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*list = (*list)->next;
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}
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*list = ret;
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}
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struct commit *pop_most_recent_commit(struct commit_list **list,
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unsigned int mark)
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{
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struct commit *ret = (*list)->item;
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struct commit_list *parents = ret->parents;
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struct commit_list *old = *list;
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*list = (*list)->next;
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free(old);
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while (parents) {
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struct commit *commit = parents->item;
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parse_commit(commit);
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if (!(commit->object.flags & mark)) {
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commit->object.flags |= mark;
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insert_by_date(list, commit);
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}
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parents = parents->next;
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}
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return ret;
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}
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