[lttng-tools.git] / src / common / time.c

/*
 * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 */

#include <common/time.h>
#include <common/error.h>
#include <common/macros.h>
#include <common/error.h>
#include <stddef.h>
#include <stdint.h>
#include <limits.h>
#include <errno.h>
#include <pthread.h>
#include <locale.h>
#include <string.h>

static bool utf8_output_supported;

LTTNG_HIDDEN
bool locale_supports_utf8(void)
{
	return utf8_output_supported;
}

LTTNG_HIDDEN
int timespec_to_ms(struct timespec ts, unsigned long *ms)
{
	unsigned long res, remain_ms;

	if (ts.tv_sec > ULONG_MAX / MSEC_PER_SEC) {
		errno = EOVERFLOW;
		return -1;	/* multiplication overflow */
	}
	res = ts.tv_sec * MSEC_PER_SEC;
	remain_ms = ULONG_MAX - res;
	if (ts.tv_nsec / NSEC_PER_MSEC > remain_ms) {
		errno = EOVERFLOW;
		return -1;	/* addition overflow */
	}
	res += ts.tv_nsec / NSEC_PER_MSEC;
	*ms = res;
	return 0;
}

LTTNG_HIDDEN
struct timespec timespec_abs_diff(struct timespec t1, struct timespec t2)
{
	uint64_t ts1 = (uint64_t) t1.tv_sec * (uint64_t) NSEC_PER_SEC +
			(uint64_t) t1.tv_nsec;
	uint64_t ts2 = (uint64_t) t2.tv_sec * (uint64_t) NSEC_PER_SEC +
			(uint64_t) t2.tv_nsec;
	uint64_t diff = max(ts1, ts2) - min(ts1, ts2);
	struct timespec res;

	res.tv_sec = diff / (uint64_t) NSEC_PER_SEC;
	res.tv_nsec = diff % (uint64_t) NSEC_PER_SEC;
	return res;
}

static
void __attribute__((constructor)) init_locale_utf8_support(void)
{
	const char *program_locale = setlocale(LC_ALL, NULL);
	const char *lang = getenv("LANG");

	if (program_locale && strstr(program_locale, "utf8")) {
		utf8_output_supported = true;
	} else if (lang && strstr(lang, "utf8")) {
		utf8_output_supported = true;
	}
}

LTTNG_HIDDEN
int time_to_iso8601_str(time_t time, char *str, size_t len)
{
	int ret = 0;
	struct tm *tm_result;
	struct tm tm_storage;
	size_t strf_ret;

	if (len < ISO8601_STR_LEN) {
		ERR("Buffer too short to format ISO 8601 timestamp: %zu bytes provided when at least %zu are needed",
				len, ISO8601_STR_LEN);
		ret = -1;
		goto end;
	}

	tm_result = localtime_r(&time, &tm_storage);
	if (!tm_result) {
		ret = -1;
		PERROR("Failed to break down timestamp to tm structure");
		goto end;
	}

	strf_ret = strftime(str, len, "%Y%m%dT%H%M%S%z", tm_result);
	if (strf_ret == 0) {
		ret = -1;
		ERR("Failed to format timestamp as local time");
		goto end;
	}
end:
	return ret;
}

LTTNG_HIDDEN
int time_to_datetime_str(time_t time, char *str, size_t len)
{
	int ret = 0;
	struct tm *tm_result;
	struct tm tm_storage;
	size_t strf_ret;

	if (len < DATETIME_STR_LEN) {
		ERR("Buffer too short to format to datetime: %zu bytes provided when at least %zu are needed",
				len, DATETIME_STR_LEN);
		ret = -1;
		goto end;
	}

	tm_result = localtime_r(&time, &tm_storage);
	if (!tm_result) {
		ret = -1;
		PERROR("Failed to break down timestamp to tm structure");
		goto end;
	}

	strf_ret = strftime(str, len, "%Y%m%d-%H%M%S", tm_result);
	if (strf_ret == 0) {
		ret = -1;
		ERR("Failed to format timestamp as local time");
		goto end;
	}
end:
	return ret;
}
Commit	Line	Data
507f5694	1	/*
ab5be9fa	2	* Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
507f5694	3	*
ab5be9fa	4	* SPDX-License-Identifier: GPL-2.0-only
507f5694	5	*
507f5694 JG	6	*/
	7
	8	#include <common/time.h>
8de88061	9	#include <common/error.h>
507f5694	10	#include <common/macros.h>
274ca939	11	#include <common/error.h>
507f5694 JG	12	#include <stddef.h>
	13	#include <stdint.h>
	14	#include <limits.h>
	15	#include <errno.h>
	16	#include <pthread.h>
2a1135fa JG	17	#include <locale.h>
	18	#include <string.h>
	19
	20	static bool utf8_output_supported;
	21
	22	LTTNG_HIDDEN
	23	bool locale_supports_utf8(void)
	24	{
	25	return utf8_output_supported;
	26	}
507f5694 JG	27
	28	LTTNG_HIDDEN
	29	int timespec_to_ms(struct timespec ts, unsigned long *ms)
	30	{
	31	unsigned long res, remain_ms;
	32
	33	if (ts.tv_sec > ULONG_MAX / MSEC_PER_SEC) {
	34	errno = EOVERFLOW;
	35	return -1; /* multiplication overflow */
	36	}
	37	res = ts.tv_sec * MSEC_PER_SEC;
	38	remain_ms = ULONG_MAX - res;
	39	if (ts.tv_nsec / NSEC_PER_MSEC > remain_ms) {
	40	errno = EOVERFLOW;
	41	return -1; /* addition overflow */
	42	}
	43	res += ts.tv_nsec / NSEC_PER_MSEC;
	44	*ms = res;
	45	return 0;
	46	}
	47
	48	LTTNG_HIDDEN
	49	struct timespec timespec_abs_diff(struct timespec t1, struct timespec t2)
	50	{
	51	uint64_t ts1 = (uint64_t) t1.tv_sec * (uint64_t) NSEC_PER_SEC +
	52	(uint64_t) t1.tv_nsec;
	53	uint64_t ts2 = (uint64_t) t2.tv_sec * (uint64_t) NSEC_PER_SEC +
	54	(uint64_t) t2.tv_nsec;
	55	uint64_t diff = max(ts1, ts2) - min(ts1, ts2);
	56	struct timespec res;
	57
	58	res.tv_sec = diff / (uint64_t) NSEC_PER_SEC;
	59	res.tv_nsec = diff % (uint64_t) NSEC_PER_SEC;
	60	return res;
	61	}
2a1135fa JG	62
	63	static
	64	void __attribute__((constructor)) init_locale_utf8_support(void)
	65	{
	66	const char *program_locale = setlocale(LC_ALL, NULL);
	67	const char *lang = getenv("LANG");
	68
	69	if (program_locale && strstr(program_locale, "utf8")) {
	70	utf8_output_supported = true;
0731b11e	71	} else if (lang && strstr(lang, "utf8")) {
2a1135fa JG	72	utf8_output_supported = true;
	73	}
	74	}
274ca939 JG	75
	76	LTTNG_HIDDEN
	77	int time_to_iso8601_str(time_t time, char *str, size_t len)
	78	{
	79	int ret = 0;
	80	struct tm *tm_result;
	81	struct tm tm_storage;
	82	size_t strf_ret;
	83
	84	if (len < ISO8601_STR_LEN) {
	85	ERR("Buffer too short to format ISO 8601 timestamp: %zu bytes provided when at least %zu are needed",
	86	len, ISO8601_STR_LEN);
	87	ret = -1;
	88	goto end;
	89	}
	90
5e5af4be	91	tm_result = localtime_r(&time, &tm_storage);
274ca939 JG	92	if (!tm_result) {
	93	ret = -1;
	94	PERROR("Failed to break down timestamp to tm structure");
	95	goto end;
	96	}
	97
	98	strf_ret = strftime(str, len, "%Y%m%dT%H%M%S%z", tm_result);
	99	if (strf_ret == 0) {
	100	ret = -1;
	101	ERR("Failed to format timestamp as local time");
	102	goto end;
	103	}
	104	end:
	105	return ret;
	106	}
a8b66566 JR	107
	108	LTTNG_HIDDEN
	109	int time_to_datetime_str(time_t time, char *str, size_t len)
	110	{
	111	int ret = 0;
	112	struct tm *tm_result;
	113	struct tm tm_storage;
	114	size_t strf_ret;
	115
	116	if (len < DATETIME_STR_LEN) {
	117	ERR("Buffer too short to format to datetime: %zu bytes provided when at least %zu are needed",
	118	len, DATETIME_STR_LEN);
	119	ret = -1;
	120	goto end;
	121	}
	122
	123	tm_result = localtime_r(&time, &tm_storage);
	124	if (!tm_result) {
	125	ret = -1;
	126	PERROR("Failed to break down timestamp to tm structure");
	127	goto end;
	128	}
	129
	130	strf_ret = strftime(str, len, "%Y%m%d-%H%M%S", tm_result);
	131	if (strf_ret == 0) {
	132	ret = -1;
	133	ERR("Failed to format timestamp as local time");
	134	goto end;
	135	}
	136	end:
	137	return ret;
	138	}