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![Junio C Hamano](/assets/img/avatar_default.png)
ISO C99 (and GCC 3.x or later) lets you write a flexible array at the end of a structure, like this: struct frotz { int xyzzy; char nitfol[]; /* more */ }; GCC 2.95 and 2.96 let you to do this with "char nitfol[0]"; unfortunately this is not allowed by ISO C90. This declares such construct like this: struct frotz { int xyzzy; char nitfol[FLEX_ARRAY]; /* more */ }; and git-compat-util.h defines FLEX_ARRAY to 0 for gcc 2.95 and empty for others. If you are using a C90 C compiler, you should be able to override this with CFLAGS=-DFLEX_ARRAY=1 from the command line of "make". Signed-off-by: Junio C Hamano <junkio@cox.net>
255 lines
5.7 KiB
C
255 lines
5.7 KiB
C
#include "cache.h"
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#include "object.h"
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#include "blob.h"
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#include "tree.h"
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#include "commit.h"
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#include "tag.h"
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struct object **objs;
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int nr_objs;
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static int obj_allocs;
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int track_object_refs = 1;
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static int find_object(const unsigned char *sha1)
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{
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int first = 0, last = nr_objs;
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while (first < last) {
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int next = (first + last) / 2;
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struct object *obj = objs[next];
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int cmp;
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cmp = memcmp(sha1, obj->sha1, 20);
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if (!cmp)
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return next;
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if (cmp < 0) {
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last = next;
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continue;
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}
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first = next+1;
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}
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return -first-1;
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}
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struct object *lookup_object(const unsigned char *sha1)
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{
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int pos = find_object(sha1);
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if (pos >= 0)
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return objs[pos];
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return NULL;
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}
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void created_object(const unsigned char *sha1, struct object *obj)
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{
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int pos = find_object(sha1);
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obj->parsed = 0;
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memcpy(obj->sha1, sha1, 20);
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obj->type = NULL;
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obj->refs = NULL;
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obj->used = 0;
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if (pos >= 0)
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die("Inserting %s twice\n", sha1_to_hex(sha1));
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pos = -pos-1;
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if (obj_allocs == nr_objs) {
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obj_allocs = alloc_nr(obj_allocs);
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objs = xrealloc(objs, obj_allocs * sizeof(struct object *));
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}
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/* Insert it into the right place */
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memmove(objs + pos + 1, objs + pos, (nr_objs - pos) *
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sizeof(struct object *));
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objs[pos] = obj;
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nr_objs++;
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}
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struct object_refs *alloc_object_refs(unsigned count)
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{
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struct object_refs *refs;
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size_t size = sizeof(*refs) + count*sizeof(struct object *);
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refs = xmalloc(size);
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memset(refs, 0, size);
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refs->count = count;
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return refs;
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}
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static int compare_object_pointers(const void *a, const void *b)
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{
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const struct object * const *pa = a;
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const struct object * const *pb = b;
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if (*pa == *pb)
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return 0;
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else if (*pa < *pb)
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return -1;
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else
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return 1;
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}
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void set_object_refs(struct object *obj, struct object_refs *refs)
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{
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unsigned int i, j;
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/* Do not install empty list of references */
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if (refs->count < 1) {
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free(refs);
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return;
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}
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/* Sort the list and filter out duplicates */
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qsort(refs->ref, refs->count, sizeof(refs->ref[0]),
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compare_object_pointers);
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for (i = j = 1; i < refs->count; i++) {
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if (refs->ref[i] != refs->ref[i - 1])
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refs->ref[j++] = refs->ref[i];
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}
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if (j < refs->count) {
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/* Duplicates were found - reallocate list */
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size_t size = sizeof(*refs) + j*sizeof(struct object *);
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refs->count = j;
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refs = xrealloc(refs, size);
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}
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for (i = 0; i < refs->count; i++)
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refs->ref[i]->used = 1;
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obj->refs = refs;
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}
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void mark_reachable(struct object *obj, unsigned int mask)
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{
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if (!track_object_refs)
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die("cannot do reachability with object refs turned off");
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/* If we've been here already, don't bother */
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if (obj->flags & mask)
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return;
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obj->flags |= mask;
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if (obj->refs) {
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const struct object_refs *refs = obj->refs;
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unsigned i;
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for (i = 0; i < refs->count; i++)
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mark_reachable(refs->ref[i], mask);
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}
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}
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struct object *lookup_object_type(const unsigned char *sha1, const char *type)
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{
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if (!type) {
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return lookup_unknown_object(sha1);
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} else if (!strcmp(type, blob_type)) {
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return &lookup_blob(sha1)->object;
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} else if (!strcmp(type, tree_type)) {
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return &lookup_tree(sha1)->object;
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} else if (!strcmp(type, commit_type)) {
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return &lookup_commit(sha1)->object;
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} else if (!strcmp(type, tag_type)) {
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return &lookup_tag(sha1)->object;
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} else {
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error("Unknown type %s", type);
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return NULL;
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}
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}
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union any_object {
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struct object object;
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struct commit commit;
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struct tree tree;
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struct blob blob;
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struct tag tag;
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};
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struct object *lookup_unknown_object(const 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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union any_object *ret = xmalloc(sizeof(*ret));
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memset(ret, 0, sizeof(*ret));
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created_object(sha1, &ret->object);
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ret->object.type = NULL;
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return &ret->object;
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}
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return obj;
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}
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struct object *parse_object(const unsigned char *sha1)
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{
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unsigned long size;
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char type[20];
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void *buffer = read_sha1_file(sha1, type, &size);
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if (buffer) {
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struct object *obj;
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if (check_sha1_signature(sha1, buffer, size, type) < 0)
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printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
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if (!strcmp(type, "blob")) {
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struct blob *blob = lookup_blob(sha1);
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parse_blob_buffer(blob, buffer, size);
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obj = &blob->object;
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} else if (!strcmp(type, "tree")) {
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struct tree *tree = lookup_tree(sha1);
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parse_tree_buffer(tree, buffer, size);
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obj = &tree->object;
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} else if (!strcmp(type, "commit")) {
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struct commit *commit = lookup_commit(sha1);
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parse_commit_buffer(commit, buffer, size);
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if (!commit->buffer) {
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commit->buffer = buffer;
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buffer = NULL;
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}
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obj = &commit->object;
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} else if (!strcmp(type, "tag")) {
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struct tag *tag = lookup_tag(sha1);
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parse_tag_buffer(tag, buffer, size);
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obj = &tag->object;
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} else {
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obj = NULL;
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}
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free(buffer);
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return obj;
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}
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return NULL;
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}
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struct object_list *object_list_insert(struct object *item,
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struct object_list **list_p)
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{
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struct object_list *new_list = xmalloc(sizeof(struct object_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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return new_list;
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}
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void object_list_append(struct object *item,
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struct object_list **list_p)
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{
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while (*list_p) {
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list_p = &((*list_p)->next);
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}
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*list_p = xmalloc(sizeof(struct object_list));
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(*list_p)->next = NULL;
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(*list_p)->item = item;
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}
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unsigned object_list_length(struct object_list *list)
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{
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unsigned ret = 0;
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while (list) {
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list = list->next;
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ret++;
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}
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return ret;
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}
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int object_list_contains(struct object_list *list, struct object *obj)
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{
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while (list) {
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if (list->item == obj)
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return 1;
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list = list->next;
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}
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return 0;
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}
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