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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/basic/percent-util.h | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/basic/percent-util.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/basic/percent-util.h b/src/basic/percent-util.h new file mode 100644 index 0000000..e975d6e --- /dev/null +++ b/src/basic/percent-util.h @@ -0,0 +1,65 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include <errno.h> +#include <inttypes.h> + +#include "macro.h" + +int parse_percent_unbounded(const char *p); +int parse_percent(const char *p); + +int parse_permille_unbounded(const char *p); +int parse_permille(const char *p); + +int parse_permyriad_unbounded(const char *p); +int parse_permyriad(const char *p); + +/* Some macro-like helpers that convert a percent/permille/permyriad value (as parsed by parse_percent()) to + * a value relative to 100% == 2^32-1. Rounds to closest. */ +static inline uint32_t UINT32_SCALE_FROM_PERCENT(int percent) { + assert_cc(INT_MAX <= UINT32_MAX); + + return (uint32_t) (((uint64_t) CLAMP(percent, 0, 100) * UINT32_MAX + 50) / 100U); +} + +static inline uint32_t UINT32_SCALE_FROM_PERMILLE(int permille) { + return (uint32_t) (((uint64_t) CLAMP(permille, 0, 1000) * UINT32_MAX + 500) / 1000U); +} + +static inline uint32_t UINT32_SCALE_FROM_PERMYRIAD(int permyriad) { + return (uint32_t) (((uint64_t) CLAMP(permyriad, 0, 10000) * UINT32_MAX + 5000) / 10000U); +} + +static inline int UINT32_SCALE_TO_PERCENT(uint32_t scale) { + uint32_t u; + + u = (uint32_t) ((((uint64_t) scale) * 100U + UINT32_MAX/2) / UINT32_MAX); + if (u > INT_MAX) + return -ERANGE; + + return (int) u; +} + +static inline int UINT32_SCALE_TO_PERMILLE(uint32_t scale) { + uint32_t u; + + u = (uint32_t) ((((uint64_t) scale) * 1000U + UINT32_MAX/2) / UINT32_MAX); + if (u > INT_MAX) + return -ERANGE; + + return (int) u; +} + +static inline int UINT32_SCALE_TO_PERMYRIAD(uint32_t scale) { + uint32_t u; + + u = (uint32_t) ((((uint64_t) scale) * 10000U + UINT32_MAX/2) / UINT32_MAX); + if (u > INT_MAX) + return -ERANGE; + + return (int) u; +} + +#define PERMYRIAD_AS_PERCENT_FORMAT_STR "%i.%02i%%" +#define PERMYRIAD_AS_PERCENT_FORMAT_VAL(x) ((x)/100), ((x)%100) |