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garray: refactor ga_grow

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- xrealloc will call xmalloc if the input pointer is NULL, no need to check
  twice.
- use the early-quit idiom to decrease the indentation, which enhances
  readability.
This commit is contained in:
Nicolas Hillegeer 2014-04-28 21:04:27 +02:00 committed by Thiago de Arruda
parent ce9c49f222
commit 466b73108f
1 changed files with 16 additions and 13 deletions
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23
src/garray.c
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@ -57,21 +57,24 @@ void ga_init(garray_T *gap, int itemsize, int growsize)
/// @param n
void ga_grow(garray_T *gap, int n)
{
if (gap->ga_maxlen - gap->ga_len < n) {
if (n < gap->ga_growsize) {
n = gap->ga_growsize;
if (gap->ga_maxlen - gap->ga_len >= n) {
// the garray still has enough space, do nothing
return;
}
size_t new_len = (size_t)(gap->ga_itemsize * (gap->ga_len + n));
char_u *pp = (gap->ga_data == NULL)
? alloc((unsigned)new_len)
: xrealloc(gap->ga_data, new_len);
size_t old_len = (size_t)(gap->ga_itemsize * gap->ga_maxlen);
memset(pp + old_len, 0, new_len - old_len);
// the garray grows by at least growsize (do we have a MIN macro somewhere?)
n = (n < gap->ga_growsize) ? gap->ga_growsize : n;
size_t new_size = (size_t)(gap->ga_itemsize * (gap->ga_len + n));
size_t old_size = (size_t)(gap->ga_itemsize * gap->ga_maxlen);
// reallocate and clear the new memory
char_u *pp = xrealloc(gap->ga_data, new_size);
memset(pp + old_size, 0, new_size - old_size);
gap->ga_maxlen = gap->ga_len + n;
gap->ga_data = pp;
}
}
/// Sort "gap" and remove duplicate entries. "gap" is expected to contain a
/// list of file names in allocated memory.