143 lines
3.2 KiB
C
143 lines
3.2 KiB
C
#include "cache.h"
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#include "tag.h"
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#include "commit.h"
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#include "tree.h"
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#include "blob.h"
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const char *tag_type = "tag";
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struct object *deref_tag(struct object *o, const char *warn, int warnlen)
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{
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while (o && o->type == OBJ_TAG)
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if (((struct tag *)o)->tagged)
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o = parse_object(((struct tag *)o)->tagged->oid.hash);
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else
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o = NULL;
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if (!o && warn) {
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if (!warnlen)
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warnlen = strlen(warn);
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error("missing object referenced by '%.*s'", warnlen, warn);
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}
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return o;
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}
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struct object *deref_tag_noverify(struct object *o)
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{
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while (o && o->type == OBJ_TAG) {
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o = parse_object(o->oid.hash);
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if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
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o = ((struct tag *)o)->tagged;
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else
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o = NULL;
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}
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return o;
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}
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struct tag *lookup_tag(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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return create_object(sha1, alloc_tag_node());
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return object_as_type(obj, OBJ_TAG, 0);
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}
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static unsigned long parse_tag_date(const char *buf, const char *tail)
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{
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const char *dateptr;
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while (buf < tail && *buf++ != '>')
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/* nada */;
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if (buf >= tail)
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return 0;
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dateptr = buf;
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while (buf < tail && *buf++ != '\n')
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/* nada */;
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if (buf >= tail)
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return 0;
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/* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */
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return strtoul(dateptr, NULL, 10);
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}
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int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
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{
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unsigned char sha1[20];
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char type[20];
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const char *bufptr = data;
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const char *tail = bufptr + size;
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const char *nl;
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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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if (size < 64)
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return -1;
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if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n')
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return -1;
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bufptr += 48; /* "object " + sha1 + "\n" */
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if (!starts_with(bufptr, "type "))
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return -1;
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bufptr += 5;
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nl = memchr(bufptr, '\n', tail - bufptr);
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if (!nl || sizeof(type) <= (nl - bufptr))
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return -1;
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memcpy(type, bufptr, nl - bufptr);
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type[nl - bufptr] = '\0';
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bufptr = nl + 1;
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if (!strcmp(type, blob_type)) {
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item->tagged = &lookup_blob(sha1)->object;
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} else if (!strcmp(type, tree_type)) {
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item->tagged = &lookup_tree(sha1)->object;
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} else if (!strcmp(type, commit_type)) {
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item->tagged = &lookup_commit(sha1)->object;
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} else if (!strcmp(type, tag_type)) {
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item->tagged = &lookup_tag(sha1)->object;
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} else {
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error("Unknown type %s", type);
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item->tagged = NULL;
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}
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if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
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; /* good */
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else
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return -1;
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bufptr += 4;
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nl = memchr(bufptr, '\n', tail - bufptr);
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if (!nl)
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return -1;
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item->tag = xmemdupz(bufptr, nl - bufptr);
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bufptr = nl + 1;
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if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
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item->date = parse_tag_date(bufptr, tail);
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else
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item->date = 0;
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return 0;
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}
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int parse_tag(struct tag *item)
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{
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enum object_type type;
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void *data;
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unsigned long size;
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int ret;
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if (item->object.parsed)
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return 0;
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data = read_sha1_file(item->object.oid.hash, &type, &size);
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if (!data)
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return error("Could not read %s",
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oid_to_hex(&item->object.oid));
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if (type != OBJ_TAG) {
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free(data);
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return error("Object %s not a tag",
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oid_to_hex(&item->object.oid));
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}
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ret = parse_tag_buffer(item, data, size);
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free(data);
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return ret;
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}
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