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Make git-rev-parse support cogito-style "short hex names"

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Currently only for unpacked objects, but the infrastructure
is there to do it for packed objects too.
This commit is contained in:
Linus Torvalds 2005-07-03 20:27:06 -07:00
parent 5f3de58ff8
commit 5736bef18c
1 changed files with 76 additions and 3 deletions
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79
rev-parse.c
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@ -102,13 +102,84 @@ static int get_parent(char *name, unsigned char *result, int idx)
return -1;
}
static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
{
static char dirname[PATH_MAX];
char hex[40];
DIR *dir;
int found;
snprintf(dirname, sizeof(dirname), "%s/%.2s", get_object_directory(), name);
dir = opendir(dirname);
sprintf(hex, "%.2s", name);
found = 0;
if (dir) {
struct dirent *de;
while ((de = readdir(dir)) != NULL) {
if (strlen(de->d_name) != 38)
continue;
if (memcmp(de->d_name, name + 2, len-2))
continue;
memcpy(hex + 2, de->d_name, 38);
if (++found > 1)
break;
}
closedir(dir);
}
if (found == 1)
return get_sha1_hex(hex, sha1) == 0;
return 0;
}
static int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1)
{
return 0;
}
static int get_short_sha1(char *name, unsigned char *sha1)
{
int i;
char canonical[40];
unsigned char res[20];
memset(res, 0, 20);
memset(canonical, 'x', 40);
for (i = 0;;i++) {
unsigned char c = name[i];
unsigned char val;
if (!c || i > 40)
break;
if (c >= '0' && c <= '9')
val = c - '0';
else if (c >= 'a' && c <= 'f')
val = c - 'a' + 10;
else if (c >= 'A' && c <='F') {
val = c - 'A' + 10;
c -= 'A' - 'a';
}
else
return -1;
canonical[i] = c;
if (!(i & 1))
val <<= 4;
res[i >> 1] |= val;
}
if (i < 4)
return -1;
if (find_short_object_filename(i, canonical, sha1))
return 0;
if (find_short_packed_object(i, res, sha1))
return 0;
return -1;
}
/*
* This is like "get_sha1()", except it allows "sha1 expressions",
* notably "xyz^" for "parent of xyz"
*/
static int get_extended_sha1(char *name, unsigned char *sha1)
{
int parent;
int parent, ret;
int len = strlen(name);
parent = 1;
@ -117,14 +188,16 @@ static int get_extended_sha1(char *name, unsigned char *sha1)
len--;
}
if (len > 1 && name[len-1] == '^') {
int ret;
name[len-1] = 0;
ret = get_parent(name, sha1, parent);
name[len-1] = '^';
if (!ret)
return 0;
}
return get_sha1(name, sha1);
ret = get_sha1(name, sha1);
if (!ret)
return 0;
return get_short_sha1(name, sha1);
}
static void show_default(void)