static bool _check_dir_contents(
git_buf *dir,
const char *sub,
bool (*predicate)(const char *))
{
bool result;
size_t dir_size = git_buf_len(dir);
size_t sub_size = strlen(sub);
size_t alloc_size;
/* leave base valid even if we could not make space for subdir */
if (GIT_ADD_SIZET_OVERFLOW(&alloc_size, dir_size, sub_size) ||
GIT_ADD_SIZET_OVERFLOW(&alloc_size, alloc_size, 2) ||
git_buf_try_grow(dir, alloc_size, false, false) < 0)
return false;
/* save excursion */
git_buf_joinpath(dir, dir->ptr, sub);
result = predicate(dir->ptr);
/* restore path */
git_buf_truncate(dir, dir_size);
return result;
}
int git_path_make_relative(git_buf *path, const char *parent)
{
const char *p, *q, *p_dirsep, *q_dirsep;
size_t plen = path->size, newlen, alloclen, depth = 1, i, offset;
for (p_dirsep = p = path->ptr, q_dirsep = q = parent; *p && *q; p++, q++) {
if (*p == '/' && *q == '/') {
p_dirsep = p;
q_dirsep = q;
}
else if (*p != *q)
break;
}
/* need at least 1 common path segment */
if ((p_dirsep == path->ptr || q_dirsep == parent) &&
(*p_dirsep != '/' || *q_dirsep != '/')) {
giterr_set(GITERR_INVALID,
"%s is not a parent of %s", parent, path->ptr);
return GIT_ENOTFOUND;
}
if (*p == '/' && !*q)
p++;
else if (!*p && *q == '/')
q++;
else if (!*p && !*q)
return git_buf_clear(path), 0;
else {
p = p_dirsep + 1;
q = q_dirsep + 1;
}
plen -= (p - path->ptr);
if (!*q)
return git_buf_set(path, p, plen);
for (; (q = strchr(q, '/')) && *(q + 1); q++)
depth++;
GITERR_CHECK_ALLOC_MULTIPLY(&newlen, depth, 3);
GITERR_CHECK_ALLOC_ADD(&newlen, newlen, plen);
GITERR_CHECK_ALLOC_ADD(&alloclen, newlen, 1);
/* save the offset as we might realllocate the pointer */
offset = p - path->ptr;
if (git_buf_try_grow(path, alloclen, 1, 0) < 0)
return -1;
p = path->ptr + offset;
memmove(path->ptr + (depth * 3), p, plen + 1);
for (i = 0; i < depth; i++)
memcpy(path->ptr + (i * 3), "../", 3);
path->size = newlen;
return 0;
}
static int _check_dir_contents(
git_buf *dir,
const char *sub,
int append_on_success,
int (*predicate)(const char *))
{
int error = GIT_SUCCESS;
size_t dir_size = dir->size;
size_t sub_size = strlen(sub);
/* leave base valid even if we could not make space for subdir */
if ((error = git_buf_try_grow(dir, dir_size + sub_size + 2)) < GIT_SUCCESS)
return error;
/* save excursion */
git_buf_joinpath(dir, dir->ptr, sub);
error = (*predicate)(dir->ptr);
/* restore excursion */
if (!append_on_success || error != GIT_SUCCESS)
git_buf_truncate(dir, dir_size);
return error;
}