commit.c

   1 #include "commit.h"
   2 #include "cache.h"
   3 #include <string.h>
   4
   5 const char *commit_type = "commit";
   6
   7 struct commit *lookup_commit(unsigned char *sha1)
   8 {
   9         struct object *obj = lookup_object(sha1);
  10         if (!obj) {
  11                 struct commit *ret = malloc(sizeof(struct commit));
  12                 memset(ret, 0, sizeof(struct commit));
  13                 created_object(sha1, &ret->object);
  14                 return ret;
  15         }
  16         if (obj->parsed && obj->type != commit_type) {
  17                 error("Object %s is a %s, not a commit",
  18                       sha1_to_hex(sha1), obj->type);
  19                 return NULL;
  20         }
  21         return (struct commit *) obj;
  22 }
  23
  24 static unsigned long parse_commit_date(const char *buf)
  25 {
  26         unsigned long date;
  27
  28         if (memcmp(buf, "author", 6))
  29                 return 0;
  30         while (*buf++ != '\n')
  31                 /* nada */;
  32         if (memcmp(buf, "committer", 9))
  33                 return 0;
  34         while (*buf++ != '>')
  35                 /* nada */;
  36         date = strtoul(buf, NULL, 10);
  37         if (date == ULONG_MAX)
  38                 date = 0;
  39         return date;
  40 }
  41
  42 int parse_commit(struct commit *item)
  43 {
  44         char type[20];
  45         void * buffer, *bufptr;
  46         unsigned long size;
  47         unsigned char parent[20];
  48         if (item->object.parsed)
  49                 return 0;
  50         item->object.parsed = 1;
  51         buffer = bufptr = read_sha1_file(item->object.sha1, type, &size);
  52         if (!buffer)
  53                 return error("Could not read %s",
  54                              sha1_to_hex(item->object.sha1));
  55         if (strcmp(type, commit_type))
  56                 return error("Object %s not a commit",
  57                              sha1_to_hex(item->object.sha1));
  58         item->object.type = commit_type;
  59         get_sha1_hex(bufptr + 5, parent);
  60         item->tree = lookup_tree(parent);
  61         add_ref(&item->object, &item->tree->object);
  62         bufptr += 46; /* "tree " + "hex sha1" + "\n" */
  63         while (!memcmp(bufptr, "parent ", 7) &&
  64                !get_sha1_hex(bufptr + 7, parent)) {
  65                 struct commit_list *new_parent =
  66                         malloc(sizeof(struct commit_list));
  67                 new_parent->next = item->parents;
  68                 new_parent->item = lookup_commit(parent);
  69                 add_ref(&item->object, &new_parent->item->object);
  70                 item->parents = new_parent;
  71                 bufptr += 48;
  72         }
  73         item->date = parse_commit_date(bufptr);
  74         free(buffer);
  75         return 0;
  76 }
  77
  78 void free_commit_list(struct commit_list *list)
  79 {
  80         while (list) {
  81                 struct commit_list *temp = list;
  82                 list = temp->next;
  83                 free(temp);
  84         }
  85 }