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-rw-r--r--src/contrib/time.c405
1 files changed, 405 insertions, 0 deletions
diff --git a/src/contrib/time.c b/src/contrib/time.c
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--- /dev/null
+++ b/src/contrib/time.c
@@ -0,0 +1,405 @@
+/* Copyright (C) 2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "contrib/time.h"
+#include "contrib/ctype.h"
+#ifndef HAVE_CLOCK_GETTIME
+ #include <sys/time.h>
+#endif
+
+struct timespec time_now(void)
+{
+ struct timespec result = { 0 };
+
+#ifdef HAVE_CLOCK_GETTIME
+ clock_gettime(CLOCK_MONOTONIC, &result);
+#else // OS X < Sierra fallback.
+ struct timeval tmp = { 0 };
+ gettimeofday(&tmp, NULL);
+ result.tv_sec = tmp.tv_sec;
+ result.tv_nsec = 1000 * tmp.tv_usec;
+#endif
+
+ return result;
+}
+
+struct timespec time_diff(const struct timespec *begin, const struct timespec *end)
+{
+ struct timespec result = { 0 };
+
+ if (end->tv_nsec >= begin->tv_nsec) {
+ result.tv_sec = end->tv_sec - begin->tv_sec;
+ result.tv_nsec = end->tv_nsec - begin->tv_nsec;
+ } else {
+ result.tv_sec = end->tv_sec - begin->tv_sec - 1;
+ result.tv_nsec = 1000000000 - begin->tv_nsec + end->tv_nsec;
+ }
+
+ return result;
+}
+
+double time_diff_ms(const struct timespec *begin, const struct timespec *end)
+{
+ struct timespec result = time_diff(begin, end);
+
+ return (result.tv_sec * 1e3) + (result.tv_nsec / 1e6);
+}
+
+typedef struct {
+ const char *format;
+ const char *timespec;
+ const char *parsed;
+ knot_timediff_t offset;
+ char offset_sign;
+ char offset_unit;
+ struct tm calendar;
+ int error;
+} time_ctx_t;
+
+// After casting (struct tm) to (int []), we can use indexes...
+static int calendar_index(char ind)
+{
+ switch (ind) {
+ case 'Y': return 5;
+ case 'M': return 4;
+ case 'D': return 3;
+ case 'h': return 2;
+ case 'm': return 1;
+ case 's': return 0;
+ default: assert(0); return 6;
+ }
+}
+
+static size_t calendar_digits(int index)
+{
+ return index == 5 ? 4 : 2;
+}
+
+static size_t unit_value(char unit)
+{
+ size_t val = 1;
+ switch (unit) {
+ case 'M':
+ return 3600 * 24 * 30;
+ case 'Y':
+ val *= 365;
+ // FALLTHROUGH
+ case 'D':
+ val *= 24;
+ // FALLTHROUGH
+ case 'h':
+ val *= 60;
+ // FALLTHROUGH
+ case 'm':
+ val *= 60;
+ // FALLTHROUGH
+ case 's':
+ default:
+ return val;
+ }
+}
+
+static knot_time_t time_ctx_finalize(time_ctx_t *ctx)
+{
+ if (ctx->offset_sign) {
+ ctx->offset *= unit_value(ctx->offset_unit);
+ return knot_time_add(knot_time(), (ctx->offset_sign == '-' ? -1 : 1) * ctx->offset);
+ } else if (ctx->offset) {
+ return (knot_time_t)ctx->offset;
+ } else if (ctx->calendar.tm_year != 0) {
+ ctx->calendar.tm_isdst = -1;
+ ctx->calendar.tm_year -= 1900;
+ ctx->calendar.tm_mon -= 1;
+ // Set UTC timezone before using mktime
+ putenv("TZ=UTC");
+ tzset();
+ return (knot_time_t)mktime(&ctx->calendar);
+ } else {
+ return (knot_time_t)0;
+ }
+}
+
+static void time_ctx_reset(time_ctx_t *ctx)
+{
+ ctx->parsed = ctx->timespec;
+ ctx->offset = 0;
+ ctx->offset_sign = 0;
+ memset(&ctx->calendar, 0, sizeof(ctx->calendar));
+ ctx->error = 0;
+}
+
+static void parse_quote(time_ctx_t *ctx)
+{
+ while (*ctx->format != '|' && *ctx->format != '\0') {
+ if (*ctx->format == '\'') {
+ ctx->format++;
+ return;
+ }
+ if (*ctx->format++ != *ctx->parsed++) {
+ ctx->error = -1;
+ return;
+ }
+ }
+ ctx->error = -2;
+ return;
+}
+
+static void parse_offset(time_ctx_t *ctx)
+{
+ ctx->offset = 0;
+ ctx->error = -1;
+ while (is_digit(*ctx->parsed)) {
+ ctx->offset *= 10;
+ ctx->offset += *ctx->parsed++ - '0';
+ ctx->error = 0;
+ }
+}
+
+static void parse_calendar(time_ctx_t *ctx, int index)
+{
+ int *cal_arr = (int *)&ctx->calendar;
+ cal_arr[index] = 0;
+ for (size_t i = 0; i < calendar_digits(index); i++) {
+ if (!is_digit(*ctx->parsed)) {
+ ctx->error = -1;
+ return;
+ }
+ cal_arr[index] *= 10;
+ cal_arr[index] += *ctx->parsed++ - '0';
+ }
+}
+
+static void parse_sign(time_ctx_t *ctx)
+{
+ char sign1 = *(ctx->format - 1), sign2 = *ctx->format;
+
+ bool use_sign2 = (sign2 == '+' || sign2 == '-');
+
+ bool allow_plus = (sign1 == '+' || (sign1 == '-' && sign2 == '+'));
+ bool allow_minus = (sign1 == '-' || (sign1 == '+' && sign2 == '-'));
+ assert(sign1 == '+' || sign1 == '-');
+
+ if ((*ctx->parsed == '+' && allow_plus) || (*ctx->parsed == '-' && allow_minus)) {
+ ctx->offset_sign = *ctx->parsed++;
+ ctx->format += (use_sign2 ? 1 : 0);
+ } else {
+ ctx->error = -11;
+ }
+}
+
+static void parse_unit1(time_ctx_t *ctx)
+{
+ char u = *ctx->parsed++;
+ switch (u) {
+ case 'Y':
+ case 'M':
+ case 'D':
+ case 'h':
+ case 'm':
+ case 's':
+ ctx->offset_unit = u;
+ break;
+ default:
+ ctx->error = -1;
+ }
+}
+
+static void parse_unit2(time_ctx_t *ctx)
+{
+ char u = *ctx->parsed++;
+ switch (u) {
+ case 'y':
+ case 'd':
+ ctx->offset_unit = toupper((unsigned char)u);
+ break;
+ case 'h':
+ case 's':
+ ctx->offset_unit = u;
+ break;
+ case 'm':
+ switch (*ctx->parsed++) {
+ case 'o':
+ ctx->offset_unit = 'M';
+ break;
+ case 'i':
+ ctx->offset_unit = 'm';
+ break;
+ default:
+ ctx->error = -1;
+ }
+ break;
+ default:
+ ctx->error = -1;
+ }
+}
+
+int knot_time_parse(const char *format, const char *timespec, knot_time_t *time)
+{
+ if (format == NULL || timespec == NULL || time == NULL) {
+ return -1;
+ }
+
+ time_ctx_t ctx = {
+ .format = format,
+ .timespec = timespec,
+ .parsed = timespec,
+ .offset = 0,
+ .offset_sign = 0,
+ // we hope that .calendar is zeroed by default
+ .error = 0,
+ };
+
+ while (ctx.error == 0 && *ctx.format != '\0') {
+ switch (*ctx.format++) {
+ case '|':
+ if (*ctx.parsed == '\0') {
+ *time = time_ctx_finalize(&ctx);
+ return 0;
+ } else {
+ time_ctx_reset(&ctx);
+ }
+ break;
+ case '\'':
+ parse_quote(&ctx);
+ break;
+ case '#':
+ parse_offset(&ctx);
+ break;
+ case 'Y':
+ case 'M':
+ case 'D':
+ case 'h':
+ case 'm':
+ case 's':
+ parse_calendar(&ctx, calendar_index(*(ctx.format - 1)));
+ break;
+ case '+':
+ case '-':
+ parse_sign(&ctx);
+ break;
+ case 'U':
+ parse_unit1(&ctx);
+ break;
+ case 'u':
+ parse_unit2(&ctx);
+ break;
+ default:
+ return -1;
+ }
+
+ if (ctx.error < 0) {
+ while (*ctx.format != '|' && *ctx.format != '\0') {
+ ctx.format++;
+ }
+ time_ctx_reset(&ctx);
+ ctx.error = (*ctx.format == '\0' ? -1 : 0);
+ }
+ }
+
+ if (ctx.error == 0 && *ctx.parsed == '\0') {
+ *time = time_ctx_finalize(&ctx);
+ return 0;
+ }
+ return -1;
+}
+
+static char *unit_names_mixed[] = { "Y", "M", "D", "h", "m", "s" };
+static char *unit_names_lower[] = { "y", "mo", "d", "h", "mi", "s" };
+static size_t unit_sizes[] = { 3600*24*365, 3600*24*30, 3600*24, 3600, 60, 1 };
+static const size_t unit_count = 6;
+
+static int print_unit(char *dst, size_t dst_len, char *unit_names[unit_count],
+ size_t max_units, knot_time_t time)
+{
+ int ret;
+ if (time == 0) {
+ ret = snprintf(dst, dst_len, "0");
+ return (ret < 0 || ret >= dst_len ? -1 : 0);
+ }
+ knot_timediff_t diff = knot_time_diff(time, knot_time());
+ if (dst_len-- < 1) {
+ return -1;
+ }
+ *dst++ = (diff < 0 ? '-' : '+');
+ if (diff < 0) {
+ diff = -diff;
+ } else if (diff == 0) {
+ ret = snprintf(dst, dst_len, "0%s", unit_names[unit_count - 1]);
+ return (ret < 0 || ret >= dst_len ? -1 : 0);
+ }
+ size_t curr_unit = 0, used_units = 0;
+ while (curr_unit < unit_count && used_units < max_units) {
+ if (diff >= unit_sizes[curr_unit]) {
+ ret = snprintf(dst, dst_len, "%"KNOT_TIMEDIFF_PRINTF"%s",
+ diff / unit_sizes[curr_unit],
+ unit_names[curr_unit]);
+ if (ret < 0 || ret >= dst_len) {
+ return -1;
+ }
+ dst += ret;
+ dst_len -= ret;
+ used_units++;
+ diff %= unit_sizes[curr_unit];
+ }
+ curr_unit++;
+ }
+ return 0;
+}
+
+int knot_time_print(knot_time_print_t format, knot_time_t time, char *dst, size_t dst_len)
+{
+ if (dst == NULL) {
+ return -1;
+ }
+
+ int ret;
+ switch (format) {
+ case TIME_PRINT_UNIX:
+ ret = snprintf(dst, dst_len, "%"KNOT_TIME_PRINTF, time);
+ return ((ret >= 0 && ret < dst_len) ? 0 : -1);
+ case TIME_PRINT_ISO8601:
+ if (time > LONG_MAX) {
+ return -1;
+ }
+
+ // Set timezone to UTC before using timezone dependent functions
+ putenv("TZ=UTC");
+ tzset();
+
+ struct tm lt;
+ time_t tt = (time_t)time;
+ ret = (localtime_r(&tt, &lt) == NULL ? -1 :
+ strftime(dst, dst_len, "%Y-%m-%dT%H:%M:%SZ", &lt));
+ return (ret > 0 ? 0 : -1);
+ case TIME_PRINT_RELSEC:
+ ret = snprintf(dst, dst_len, "%+"KNOT_TIMEDIFF_PRINTF,
+ knot_time_diff(time, knot_time()));
+ return ((ret >= 0 && ret < dst_len) ? 0 : -1);
+ case TIME_PRINT_HUMAN_MIXED:
+ return print_unit(dst, dst_len, unit_names_mixed, unit_count, time);
+ case TIME_PRINT_HUMAN_LOWER:
+ return print_unit(dst, dst_len, unit_names_lower, unit_count, time);
+ default:
+ return -1;
+ }
+}
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