Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "tag.h"
   3#include "commit.h"
   4#include "tree.h"
   5#include "blob.h"
   6
   7const char *tag_type = "tag";
   8
   9struct object *deref_tag(struct object *o, const char *warn, int warnlen)
  10{
  11        while (o && o->type == OBJ_TAG)
  12                if (((struct tag *)o)->tagged)
  13                        o = parse_object(((struct tag *)o)->tagged->sha1);
  14                else
  15                        o = NULL;
  16        if (!o && warn) {
  17                if (!warnlen)
  18                        warnlen = strlen(warn);
  19                error("missing object referenced by '%.*s'", warnlen, warn);
  20        }
  21        return o;
  22}
  23
  24struct object *deref_tag_noverify(struct object *o)
  25{
  26        while (o && o->type == OBJ_TAG) {
  27                o = parse_object(o->sha1);
  28                if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged)
  29                        o = ((struct tag *)o)->tagged;
  30                else
  31                        o = NULL;
  32        }
  33        return o;
  34}
  35
  36struct tag *lookup_tag(const unsigned char *sha1)
  37{
  38        struct object *obj = lookup_object(sha1);
  39        if (!obj)
  40                return create_object(sha1, alloc_tag_node());
  41        return object_as_type(obj, OBJ_TAG, 0);
  42}
  43
  44static unsigned long parse_tag_date(const char *buf, const char *tail)
  45{
  46        const char *dateptr;
  47
  48        while (buf < tail && *buf++ != '>')
  49                /* nada */;
  50        if (buf >= tail)
  51                return 0;
  52        dateptr = buf;
  53        while (buf < tail && *buf++ != '\n')
  54                /* nada */;
  55        if (buf >= tail)
  56                return 0;
  57        /* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */
  58        return strtoul(dateptr, NULL, 10);
  59}
  60
  61int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
  62{
  63        unsigned char sha1[20];
  64        char type[20];
  65        const char *bufptr = data;
  66        const char *tail = bufptr + size;
  67        const char *nl;
  68
  69        if (item->object.parsed)
  70                return 0;
  71        item->object.parsed = 1;
  72
  73        if (size < 64)
  74                return -1;
  75        if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n')
  76                return -1;
  77        bufptr += 48; /* "object " + sha1 + "\n" */
  78
  79        if (!starts_with(bufptr, "type "))
  80                return -1;
  81        bufptr += 5;
  82        nl = memchr(bufptr, '\n', tail - bufptr);
  83        if (!nl || sizeof(type) <= (nl - bufptr))
  84                return -1;
  85        strncpy(type, bufptr, nl - bufptr);
  86        type[nl - bufptr] = '\0';
  87        bufptr = nl + 1;
  88
  89        if (!strcmp(type, blob_type)) {
  90                item->tagged = &lookup_blob(sha1)->object;
  91        } else if (!strcmp(type, tree_type)) {
  92                item->tagged = &lookup_tree(sha1)->object;
  93        } else if (!strcmp(type, commit_type)) {
  94                item->tagged = &lookup_commit(sha1)->object;
  95        } else if (!strcmp(type, tag_type)) {
  96                item->tagged = &lookup_tag(sha1)->object;
  97        } else {
  98                error("Unknown type %s", type);
  99                item->tagged = NULL;
 100        }
 101
 102        if (bufptr + 4 < tail && starts_with(bufptr, "tag "))
 103                ;               /* good */
 104        else
 105                return -1;
 106        bufptr += 4;
 107        nl = memchr(bufptr, '\n', tail - bufptr);
 108        if (!nl)
 109                return -1;
 110        item->tag = xmemdupz(bufptr, nl - bufptr);
 111        bufptr = nl + 1;
 112
 113        if (bufptr + 7 < tail && starts_with(bufptr, "tagger "))
 114                item->date = parse_tag_date(bufptr, tail);
 115        else
 116                item->date = 0;
 117
 118        return 0;
 119}
 120
 121int parse_tag(struct tag *item)
 122{
 123        enum object_type type;
 124        void *data;
 125        unsigned long size;
 126        int ret;
 127
 128        if (item->object.parsed)
 129                return 0;
 130        data = read_sha1_file(item->object.sha1, &type, &size);
 131        if (!data)
 132                return error("Could not read %s",
 133                             sha1_to_hex(item->object.sha1));
 134        if (type != OBJ_TAG) {
 135                free(data);
 136                return error("Object %s not a tag",
 137                             sha1_to_hex(item->object.sha1));
 138        }
 139        ret = parse_tag_buffer(item, data, size);
 140        free(data);
 141        return ret;
 142}