forked from osmocom/wireshark
399 lines
8.8 KiB
C
399 lines
8.8 KiB
C
/*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 2001 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/*
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* Just make sure we include the prototype for strptime as well
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* (needed for glibc 2.2) but make sure we do this only if not
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* yet defined.
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*/
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#ifndef __USE_XOPEN
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# define __USE_XOPEN
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#endif
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#include <time.h>
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#include <ftypes-int.h>
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#include <epan/to_str.h>
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#ifndef HAVE_STRPTIME
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#include "wsutil/strptime.h"
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#endif
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static int
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cmp_order(const fvalue_t *a, const fvalue_t *b)
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{
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return nstime_cmp(&(a->value.time), &(b->value.time));
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}
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/*
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* Get a nanoseconds value, starting at "p".
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*
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* Returns true on success, false on failure.
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*/
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static gboolean
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get_nsecs(const char *startp, int *nsecs)
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{
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int ndigits;
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int scale;
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const char *p;
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int val;
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int digit;
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int i;
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/*
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* How many characters are in the string?
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*/
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ndigits = (int)strlen(startp);
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/*
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* If there are N characters in the string, the last of the
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* characters would be the digit corresponding to 10^(9-N)
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* nanoseconds.
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*/
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scale = 9 - ndigits;
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/*
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* Start at the last character, and work backwards.
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*/
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p = startp + ndigits;
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val = 0;
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while (p != startp) {
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p--;
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if (!g_ascii_isdigit(*p)) {
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/*
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* Not a digit - error.
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*/
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return FALSE;
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}
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digit = *p - '0';
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if (digit != 0) {
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/*
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* Non-zero digit corresponding to that number
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* of (10^scale) units.
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*
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* If scale is less than zero, this digit corresponds
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* to a value less than a nanosecond, so this number
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* isn't valid.
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*/
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if (scale < 0)
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return FALSE;
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for (i = 0; i < scale; i++)
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digit *= 10;
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val += digit;
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}
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scale++;
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}
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*nsecs = val;
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return TRUE;
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}
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static gboolean
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relative_val_from_unparsed(fvalue_t *fv, const char *s, gboolean allow_partial_value _U_, gchar **err_msg)
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{
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const char *curptr;
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char *endptr;
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gboolean negative = FALSE;
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curptr = s;
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if (*curptr == '-') {
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negative = TRUE;
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curptr++;
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}
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/*
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* If it doesn't begin with ".", it should contain a seconds
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* value.
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*/
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if (*curptr != '.') {
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/*
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* Get the seconds value.
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*/
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fv->value.time.secs = strtoul(curptr, &endptr, 10);
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if (endptr == curptr || (*endptr != '\0' && *endptr != '.'))
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goto fail;
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curptr = endptr;
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if (*curptr == '.')
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curptr++; /* skip the decimal point */
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} else {
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/*
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* No seconds value - it's 0.
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*/
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fv->value.time.secs = 0;
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curptr++; /* skip the decimal point */
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}
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/*
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* If there's more stuff left in the string, it should be the
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* nanoseconds value.
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*/
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if (*curptr != '\0') {
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/*
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* Get the nanoseconds value.
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*/
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if (!get_nsecs(curptr, &fv->value.time.nsecs))
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goto fail;
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} else {
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/*
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* No nanoseconds value - it's 0.
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*/
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fv->value.time.nsecs = 0;
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}
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if (negative) {
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fv->value.time.secs = -fv->value.time.secs;
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fv->value.time.nsecs = -fv->value.time.nsecs;
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}
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return TRUE;
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fail:
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if (err_msg != NULL)
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*err_msg = ws_strdup_printf("\"%s\" is not a valid time.", s);
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return FALSE;
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}
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/* Returns TRUE if 's' starts with an abbreviated month name. */
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static gboolean
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parse_month_name(const char *s, int *tm_mon)
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{
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const char *months[] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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};
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for (int i = 0; i < 12; i++) {
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if (g_ascii_strncasecmp(s, months[i], 3) == 0) {
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*tm_mon = i;
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return TRUE;
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}
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}
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return FALSE;
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}
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/* Parses an absolute time value from a string. The string cannot have
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* a time zone suffix and is always interpreted in local time.
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*
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* OS-dependent; e.g., on 32 bit versions of Windows when compiled to use
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* _mktime32 treats dates before January 1, 1970 as invalid.
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* (https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/mktime-mktime32-mktime64)
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*/
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static gboolean
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absolute_val_from_string(fvalue_t *fv, const char *s, gchar **err_msg)
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{
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struct tm tm;
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char *curptr = NULL;
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gboolean has_seconds = TRUE;
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memset(&tm, 0, sizeof(tm));
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if (strlen(s) < sizeof("2000-1-1") - 1)
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goto fail;
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/* Do not use '%b' to parse the month name, it is locale-specific. */
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if (s[3] == ' ' && parse_month_name(s, &tm.tm_mon))
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curptr = strptime(s + 4, "%d, %Y %H:%M:%S", &tm);
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if (curptr == NULL)
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curptr = strptime(s,"%Y-%m-%dT%H:%M:%S", &tm);
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if (curptr == NULL)
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curptr = strptime(s,"%Y-%m-%d %H:%M:%S", &tm);
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if (curptr == NULL) {
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has_seconds = FALSE;
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curptr = strptime(s,"%Y-%m-%d %H:%M", &tm);
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}
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if (curptr == NULL)
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curptr = strptime(s,"%Y-%m-%d %H", &tm);
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if (curptr == NULL)
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curptr = strptime(s,"%Y-%m-%d", &tm);
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if (curptr == NULL)
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goto fail;
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tm.tm_isdst = -1; /* let the computer figure out if it's DST */
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fv->value.time.secs = mktime(&tm);
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if (*curptr != '\0') {
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/*
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* Something came after the seconds field; it must be
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* a nanoseconds field.
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*/
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if (*curptr != '.' || !has_seconds)
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goto fail; /* it's not */
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curptr++; /* skip the "." */
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if (!g_ascii_isdigit((unsigned char)*curptr))
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goto fail; /* not a digit, so not valid */
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if (!get_nsecs(curptr, &fv->value.time.nsecs))
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goto fail;
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} else {
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/*
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* No nanoseconds value - it's 0.
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*/
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fv->value.time.nsecs = 0;
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}
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if (fv->value.time.secs == -1) {
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/*
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* XXX - should we supply an error message that mentions
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* that the time specified might be syntactically valid
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* but might not actually have occurred, e.g. a time in
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* the non-existent time range after the clocks are
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* set forward during daylight savings time (or possibly
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* that it's in the time range after the clocks are set
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* backward, so that there are two different times that
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* it could be)?
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*/
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goto fail;
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}
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return TRUE;
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fail:
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if (err_msg != NULL)
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*err_msg = ws_strdup_printf("\"%s\" is not a valid absolute time. Example: \"Nov 12, 1999 08:55:44.123\" or \"2011-07-04 12:34:56\"",
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s);
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return FALSE;
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}
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static gboolean
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absolute_val_from_unparsed(fvalue_t *fv, const char *s, gboolean allow_partial_value _U_, gchar **err_msg)
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{
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return absolute_val_from_string(fv, s, err_msg);
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}
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static void
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time_fvalue_new(fvalue_t *fv)
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{
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fv->value.time.secs = 0;
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fv->value.time.nsecs = 0;
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}
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static void
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time_fvalue_set(fvalue_t *fv, const nstime_t *value)
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{
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fv->value.time = *value;
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}
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static gpointer
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value_get(fvalue_t *fv)
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{
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return &(fv->value.time);
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}
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static char *
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absolute_val_to_repr(wmem_allocator_t *scope, const fvalue_t *fv, ftrepr_t rtype, int field_display)
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{
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gchar *rep;
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char *buf;
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switch (rtype) {
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case FTREPR_DISPLAY:
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rep = abs_time_to_str(scope, &fv->value.time,
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(absolute_time_display_e)field_display, TRUE);
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break;
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case FTREPR_DFILTER:
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/* absolute_val_from_string only accepts local time,
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* with no time zone, so match that. */
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rep = abs_time_to_str(scope, &fv->value.time,
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ABSOLUTE_TIME_LOCAL, FALSE);
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break;
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default:
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ws_assert_not_reached();
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break;
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}
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if (rtype == FTREPR_DFILTER) {
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buf = wmem_strdup_printf(scope, "\"%s\"", rep);
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wmem_free(scope, rep);
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}
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else {
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buf = rep;
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}
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return buf;
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}
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static char *
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relative_val_to_repr(wmem_allocator_t *scope, const fvalue_t *fv, ftrepr_t rtype _U_, int field_display _U_)
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{
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return rel_time_to_secs_str(scope, &fv->value.time);
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}
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void
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ftype_register_time(void)
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{
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static ftype_t abstime_type = {
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FT_ABSOLUTE_TIME, /* ftype */
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"FT_ABSOLUTE_TIME", /* name */
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"Date and time", /* pretty_name */
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0, /* wire_size */
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time_fvalue_new, /* new_value */
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NULL, /* free_value */
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absolute_val_from_unparsed, /* val_from_unparsed */
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absolute_val_from_string, /* val_from_string */
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NULL, /* val_from_charconst */
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absolute_val_to_repr, /* val_to_string_repr */
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{ .set_value_time = time_fvalue_set }, /* union set_value */
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{ .get_value_ptr = value_get }, /* union get_value */
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cmp_order,
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NULL, /* cmp_bitwise_and */
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NULL, /* cmp_contains */
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NULL, /* cmp_matches */
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NULL,
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NULL
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};
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static ftype_t reltime_type = {
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FT_RELATIVE_TIME, /* ftype */
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"FT_RELATIVE_TIME", /* name */
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"Time offset", /* pretty_name */
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0, /* wire_size */
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time_fvalue_new, /* new_value */
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NULL, /* free_value */
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relative_val_from_unparsed, /* val_from_unparsed */
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NULL, /* val_from_string */
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NULL, /* val_from_charconst */
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relative_val_to_repr, /* val_to_string_repr */
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{ .set_value_time = time_fvalue_set }, /* union set_value */
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{ .get_value_ptr = value_get }, /* union get_value */
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cmp_order,
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NULL, /* cmp_bitwise_and */
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NULL, /* cmp_contains */
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NULL, /* cmp_matches */
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NULL,
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NULL
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};
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ftype_register(FT_ABSOLUTE_TIME, &abstime_type);
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ftype_register(FT_RELATIVE_TIME, &reltime_type);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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