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770896e548
In particular, teach it about tags. Also, to make reachability actually work for tags, we need to add the ref to the tagged object.
82 lines
2 KiB
C
82 lines
2 KiB
C
#include "tag.h"
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#include "cache.h"
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const char *tag_type = "tag";
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struct tag *lookup_tag(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 tag *ret = xmalloc(sizeof(struct tag));
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memset(ret, 0, sizeof(struct tag));
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created_object(sha1, &ret->object);
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ret->object.type = tag_type;
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return ret;
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}
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if (obj->type != tag_type) {
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error("Object %s is a %s, not a tree",
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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 tag *) obj;
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}
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int parse_tag(struct tag *item)
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{
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char type[20];
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void *data, *bufptr;
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unsigned long size;
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int typelen, taglen;
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unsigned char object[20];
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const char *type_line, *tag_line, *sig_line;
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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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data = bufptr = read_sha1_file(item->object.sha1, type, &size);
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if (!data)
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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, tag_type)) {
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free(data);
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return error("Object %s not a tag",
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sha1_to_hex(item->object.sha1));
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}
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if (size < 64)
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goto err;
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if (memcmp("object ", data, 7) || get_sha1_hex(data + 7, object))
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goto err;
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item->tagged = parse_object(object);
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if (item->tagged)
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add_ref(&item->object, item->tagged);
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type_line = data + 48;
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if (memcmp("\ntype ", type_line-1, 6))
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goto err;
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tag_line = strchr(type_line, '\n');
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if (!tag_line || memcmp("tag ", ++tag_line, 4))
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goto err;
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sig_line = strchr(tag_line, '\n');
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if (!sig_line)
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goto err;
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sig_line++;
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typelen = tag_line - type_line - strlen("type \n");
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if (typelen >= 20)
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goto err;
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taglen = sig_line - tag_line - strlen("tag \n");
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item->tag = xmalloc(taglen + 1);
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memcpy(item->tag, tag_line + 4, taglen);
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item->tag[taglen] = '\0';
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free(data);
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return 0;
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err:
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free(data);
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return -1;
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}
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