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Add rz_num_align_delta()

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This commit is contained in:
Florian Märkl 2021-03-11 20:55:47 +01:00 committed by Anton Kochkov
parent 7ce4721238
commit ee1dfffae5
2 changed files with 30 additions and 0 deletions
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15
librz/include/rz_util/rz_num.h
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@ -103,6 +103,21 @@ static inline st64 rz_num_abs(st64 num) {
return num < 0 ? -num : num;
}
/**
* \brief Padding to align v to the next alignment-boundary.
* \return the least `d` such that `(v + d) % alignment == 0`.
*/
static inline ut64 rz_num_align_delta(ut64 v, ut64 alignment) {
if (!alignment) {
return 0;
}
ut64 excess = v % alignment;
if (!excess) {
return 0;
}
return alignment - excess;
}
#ifdef __cplusplus
}
#endif

15
test/unit/test_unum.c
View file

@ -129,6 +129,20 @@ bool test_rz_num_str_split_list() {
mu_end;
}
bool test_rz_num_align_delta() {
ut64 d = rz_num_align_delta(0, 8);
mu_assert_eq(d, 0, "align delta");
d = rz_num_align_delta(3, 8);
mu_assert_eq(d, 5, "align delta");
d = rz_num_align_delta(0x10, 8);
mu_assert_eq(d, 0, "align delta");
d = rz_num_align_delta(0x11, 8);
mu_assert_eq(d, 7, "align delta");
d = rz_num_align_delta(0x42, 0);
mu_assert_eq(d, 0, "align delta");
mu_end;
}
bool all_tests() {
mu_run_test(test_rz_num_units);
mu_run_test(test_rz_num_minmax_swap_i);
@ -137,6 +151,7 @@ bool all_tests() {
mu_run_test(test_rz_num_str_len);
mu_run_test(test_rz_num_str_split);
mu_run_test(test_rz_num_str_split_list);
mu_run_test(test_rz_num_align_delta);
return tests_passed != tests_run;
}