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strvec: introduce new strvec_splice() function

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Introduce a new `strvec_splice()` function that can replace a range of
strings in the vector with another array of strings. This function will
be used in subsequent commits.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt
2024-11-20 14:39:38 +01:00
committed by Junio C Hamano
parent 141766d1bb
commit 3f5fadef37
3 changed files with 93 additions and 0 deletions
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19
strvec.c
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@ -56,6 +56,25 @@ void strvec_pushv(struct strvec *array, const char **items)
strvec_push(array, *items);
}
void strvec_splice(struct strvec *array, size_t idx, size_t len,
const char **replacement, size_t replacement_len)
{
if (idx + len > array->nr)
BUG("range outside of array boundary");
if (replacement_len > len)
ALLOC_GROW(array->v, array->nr + (replacement_len - len) + 1,
array->alloc);
for (size_t i = 0; i < len; i++)
free((char *)array->v[idx + i]);
if (replacement_len != len) {
memmove(array->v + idx + replacement_len, array->v + idx + len,
(array->nr - idx - len + 1) * sizeof(char *));
array->nr += (replacement_len - len);
}
for (size_t i = 0; i < replacement_len; i++)
array->v[idx + i] = xstrdup(replacement[i]);
}
const char *strvec_replace(struct strvec *array, size_t idx, const char *replacement)
{
char *to_free;