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strv: introduce strv_copy_unless_empty()

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(cherry picked from commit 5058bd7e1f0ae226d835253fcf333da3ab8d2806)
(cherry picked from commit 24513d016b4278903240e192759d6d6bcc4954da)
(cherry picked from commit e4763054c5434a89637d25053f0547e897e20cb4)
This commit is contained in:
Ludwig Nussel 2024-01-09 17:31:01 +01:00 committed by Luca Boccassi
parent 995722c3ef
commit 98d254fb35
2 changed files with 17 additions and 0 deletions
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16
src/basic/strv.c
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@ -97,6 +97,22 @@ char** strv_copy(char * const *l) {
return TAKE_PTR(result);
}
int strv_copy_unless_empty(char * const *l, char ***ret) {
assert(ret);
if (strv_isempty(l)) {
*ret = NULL;
return 0;
}
char **copy = strv_copy(l);
if (!copy)
return -ENOMEM;
*ret = TAKE_PTR(copy);
return 1;
}
size_t strv_length(char * const *l) {
size_t n = 0;

1
src/basic/strv.h
View File

@ -30,6 +30,7 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(char**, strv_free_erase);
#define _cleanup_strv_free_erase_ _cleanup_(strv_free_erasep)
char** strv_copy(char * const *l);
int strv_copy_unless_empty(char * const *l, char ***ret);
size_t strv_length(char * const *l) _pure_;
int strv_extend_strv(char ***a, char * const *b, bool filter_duplicates);