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commit: add "lookup_commit_reference()" helper function 

It's pretty much the same as "lookup_commit()", but it will take
tags too, and look up the commit (if any) associated with them.
This commit is contained in:
Linus Torvalds 2005-05-18 16:14:22 -07:00
parent fbab835c03
commit 961784ee42
2 changed files with 24 additions and 6 deletions
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29
commit.c
View File

@ -1,3 +1,4 @@
#include "tag.h"
#include "commit.h"
#include "cache.h"
#include <string.h>
@ -5,6 +6,27 @@
const char *commit_type = "commit";
static struct commit *check_commit(struct object *obj, unsigned char *sha1)
{
if (obj->type != commit_type) {
error("Object %s is a %s, not a commit",
sha1_to_hex(sha1), obj->type);
return NULL;
}
return (struct commit *) obj;
}
struct commit *lookup_commit_reference(unsigned char *sha1)
{
struct object *obj = parse_object(sha1);
if (!obj)
return NULL;
if (obj->type == tag_type)
obj = ((struct tag *)obj)->tagged;
return check_commit(obj, sha1);
}
struct commit *lookup_commit(unsigned char *sha1)
{
struct object *obj = lookup_object(sha1);
@ -15,12 +37,7 @@ struct commit *lookup_commit(unsigned char *sha1)
ret->object.type = commit_type;
return ret;
}
if (obj->type != commit_type) {
error("Object %s is a %s, not a commit",
sha1_to_hex(sha1), obj->type);
return NULL;
}
return (struct commit *) obj;
return check_commit(obj, sha1);
}
static unsigned long parse_commit_date(const char *buf)

1
commit.h
View File

@ -19,6 +19,7 @@ struct commit {
extern const char *commit_type;
struct commit *lookup_commit(unsigned char *sha1);
struct commit *lookup_commit_reference(unsigned char *sha1);
int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size);