Initial commit for TizenHEADsubmit/2.0alpha/20130201.014617accepted/2.0alpha/20130201.0121062.0alpha

1 files changed, 135 insertions, 0 deletions

diff --git a/tag.c b/tag.c
new file mode 100644
index 0000000..85607c2
--- /dev/null
+++ b/tag.c
@@ -0,0 +1,135 @@
+#include "cache.h"
+#include "tag.h"
+#include "commit.h"
+#include "tree.h"
+#include "blob.h"
+
+const char *tag_type = "tag";
+
+struct object *deref_tag(struct object *o, const char *warn, int warnlen)
+{
+	while (o && o->type == OBJ_TAG)
+		if (((struct tag *)o)->tagged)
+			o = parse_object(((struct tag *)o)->tagged->sha1);
+		else
+			o = NULL;
+	if (!o && warn) {
+		if (!warnlen)
+			warnlen = strlen(warn);
+		error("missing object referenced by '%.*s'", warnlen, warn);
+	}
+	return o;
+}
+
+struct tag *lookup_tag(const unsigned char *sha1)
+{
+	struct object *obj = lookup_object(sha1);
+	if (!obj)
+		return create_object(sha1, OBJ_TAG, alloc_tag_node());
+	if (!obj->type)
+		obj->type = OBJ_TAG;
+        if (obj->type != OBJ_TAG) {
+                error("Object %s is a %s, not a tag",
+                      sha1_to_hex(sha1), typename(obj->type));
+                return NULL;
+        }
+        return (struct tag *) obj;
+}
+
+static unsigned long parse_tag_date(const char *buf, const char *tail)
+{
+	const char *dateptr;
+
+	while (buf < tail && *buf++ != '>')
+		/* nada */;
+	if (buf >= tail)
+		return 0;
+	dateptr = buf;
+	while (buf < tail && *buf++ != '\n')
+		/* nada */;
+	if (buf >= tail)
+		return 0;
+	/* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */
+	return strtoul(dateptr, NULL, 10);
+}
+
+int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
+{
+	unsigned char sha1[20];
+	char type[20];
+	const char *bufptr = data;
+	const char *tail = bufptr + size;
+	const char *nl;
+
+	if (item->object.parsed)
+		return 0;
+	item->object.parsed = 1;
+
+	if (size < 64)
+		return -1;
+	if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n')
+		return -1;
+	bufptr += 48; /* "object " + sha1 + "\n" */
+
+	if (prefixcmp(bufptr, "type "))
+		return -1;
+	bufptr += 5;
+	nl = memchr(bufptr, '\n', tail - bufptr);
+	if (!nl || sizeof(type) <= (nl - bufptr))
+		return -1;
+	strncpy(type, bufptr, nl - bufptr);
+	type[nl - bufptr] = '\0';
+	bufptr = nl + 1;
+
+	if (!strcmp(type, blob_type)) {
+		item->tagged = &lookup_blob(sha1)->object;
+	} else if (!strcmp(type, tree_type)) {
+		item->tagged = &lookup_tree(sha1)->object;
+	} else if (!strcmp(type, commit_type)) {
+		item->tagged = &lookup_commit(sha1)->object;
+	} else if (!strcmp(type, tag_type)) {
+		item->tagged = &lookup_tag(sha1)->object;
+	} else {
+		error("Unknown type %s", type);
+		item->tagged = NULL;
+	}
+
+	if (prefixcmp(bufptr, "tag "))
+		return -1;
+	bufptr += 4;
+	nl = memchr(bufptr, '\n', tail - bufptr);
+	if (!nl)
+		return -1;
+	item->tag = xmemdupz(bufptr, nl - bufptr);
+	bufptr = nl + 1;
+
+	if (!prefixcmp(bufptr, "tagger "))
+		item->date = parse_tag_date(bufptr, tail);
+	else
+		item->date = 0;
+
+	return 0;
+}
+
+int parse_tag(struct tag *item)
+{
+	enum object_type type;
+	void *data;
+	unsigned long size;
+	int ret;
+
+	if (item->object.parsed)
+		return 0;
+	data = read_sha1_file(item->object.sha1, &type, &size);
+	if (!data)
+		return error("Could not read %s",
+			     sha1_to_hex(item->object.sha1));
+	if (type != OBJ_TAG) {
+		free(data);
+		return error("Object %s not a tag",
+			     sha1_to_hex(item->object.sha1));
+	}
+	ret = parse_tag_buffer(item, data, size);
+	free(data);
+	return ret;
+}