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timegrep.c
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timegrep.c
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/**
* Copyright (c) 2017-2020 Anton Batenev
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#define _GNU_SOURCE
#ifdef __linux__
#include <features.h>
#endif
#include <pcre.h>
#include <time.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <limits.h>
#include <stdlib.h>
#include <stdint.h>
#include <libintl.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/time.h>
/**
* Program version for --version, -v
*/
static const char* TG_VERSION = "0.7";
/**
* Default chunk size for io / memory in bytes (512KB)
*/
#ifndef TG_CHUNK_SIZE
#define TG_CHUNK_SIZE (512 * 1024)
#endif
#if TG_CHUNK_SIZE % 8192 != 0
#error "TG_CHUNK_SIZE must be aligned to 8192 bytes"
#endif
/**
* Use TG_TIMEZONE instead glibc timezone external variable
* to compile on FreeBSD and other "non linux"
*/
static time_t TG_TIMEZONE = 0;
/**
* Error codes
*/
static const int TG_FOUND = 2; /* something found */
static const int TG_NOT_FOUND = 1; /* nothing found */
static const int TG_NULL = 0; /* undetermined result */
static const int TG_ERROR = -1; /* unrecoverable error */
/**
* Predefined datetime formats
*/
static const struct {
const char* name; /* format name */
const char* alias; /* format alias */
const char* format; /* datetime format (see strptime) */
} TG_FORMATS[] = {
{
"default",
NULL,
"%Y-%m-%d %H:%M:%S"
},
{
"iso",
NULL,
"%Y-%m-%dT%H:%M:%S%z"
},
{
"common",
NULL,
"%d/%b/%Y:%H:%M:%S %z"
},
{
"syslog",
NULL,
"%b %d %H:%M:%S"
},
{
"tskv",
NULL,
"unixtime=%s"
},
{ "apache", "common", NULL },
{ "nginx", "common", NULL },
{ NULL, NULL, NULL }
};
/**
* tg_strptime_re named subexpressions indexes
*/
typedef struct {
int year;
int month;
int month_t;
int day;
int hour;
int minute;
int second;
int timezone;
int timestamp;
} tg_pcre_nsi;
/**
* tg_strptime_regex_nsc named subexpressions count
*/
typedef tg_pcre_nsi tg_pcre_nsc;
/**
* datetime parser context
*/
typedef struct {
pcre* re; /* compiled regular expression for datetime */
pcre_extra* extra; /* optimized regular expression for datetime */
tg_pcre_nsi nsi; /* named regular expressions indexes or fallback flag */
const char* format; /* datetime format for tg_strptime */
int format_tz; /* datetime format use timezone information */
int fallback; /* force use tg_strptime */
} tg_parser;
/**
* working context
*/
typedef struct {
const char* filename; /* current filename */
int fd; /* file descriptor */
size_t size; /* size of file / mapped memory */
char* data; /* mapped memory */
time_t start; /* timestamp from search */
time_t stop; /* timestamp to search */
size_t chunk; /* io / memory chunk size */
tg_parser parser; /* datetime parser context */
} tg_context;
/**
* Print program name and version
*/
static void tg_print_version()
{
printf("timegrep %s\n", TG_VERSION);
}
/**
* Print usage
*/
static void tg_print_help()
{
size_t i;
int len;
int width = 0;
printf("\n");
printf(gettext(
"Usage:\n"
" timegrep [options] [files]"
));
printf("\n\n");
printf(gettext(
"Options:\n"
" --format, -e -- datetime format (default: 'default')\n"
" --start, -f -- datetime to start search (default: now)\n"
" --stop, -t -- datetime to stop search (default: now)\n"
" --seconds, -s -- seconds to substract from --start (default: 0)\n"
" --minutes, -m -- minutes to substract from --start (default: 0)\n"
" --hours, -h -- hours to substract from --start (default: 0)\n"
" --version, -v -- print program version and exit\n"
" --help, -? -- print this help message"
));
printf("\n\n");
printf(gettext(
"Formats:"
));
printf("\n");
i = 0;
while (TG_FORMATS[i].name != NULL) {
len = (int)strlen(TG_FORMATS[i].name);
if (len > width)
width = len;
i++;
}
i = 0;
while (TG_FORMATS[i].name != NULL) {
if (TG_FORMATS[i].alias != NULL)
printf(" %-*s -- %s '%s'\n", width, TG_FORMATS[i].name, gettext("alias for"), TG_FORMATS[i].alias);
else
printf(" %-*s -- %s\n", width, TG_FORMATS[i].name, TG_FORMATS[i].format);
i++;
}
printf("\n");
printf(gettext(
"See strptime(3) for format details"
));
printf("\n\n");
}
/**
* Set global TG_TIMEZONE variable,
* so local time = GMT time + TG_TIMEZONE
*/
static void tg_set_timezone()
{
time_t t;
struct tm tm;
tzset();
t = time(NULL);
localtime_r(&t, &tm);
TG_TIMEZONE = tm.tm_gmtoff;
}
/**
* Parse time unit interval from string and combine with multipler
* Return parsed value in seconds on success
* Return LONG_MIN on error or invalid interval
*/
static long int tg_parse_interval(const char* string, long int multipler)
{
long int value;
value = strtol(string, NULL, 10);
if (value < 0 || value == LONG_MAX) {
errno = ERANGE;
return LONG_MIN;
}
return value * multipler;
}
/**
* Internal recursion of tg_strptime_regex
* Return SIZE_MAX on error
*/
static size_t tg_strptime_regex_nsc(const char* format, char* regex, int* fallback, tg_pcre_nsc* nsc)
{
char c;
size_t format_index;
size_t format_length;
size_t regex_index;
const char* escape;
size_t escape_length;
const char* part;
size_t part_length;
escape = "^$|()[]{}.*+?\\";
escape_length = strlen(escape);
format_length = strlen(format);
regex_index = 0;
for (format_index = 0; format_index < format_length; format_index++) {
c = format[format_index];
if (c == '%') {
if (format_index + 1 == format_length) {
errno = 0;
fprintf(stderr, gettext("%s Unexpected format char '%%' at end of format string\n"), gettext("ERROR:"));
return SIZE_MAX;
}
c = format[format_index + 1];
format_index++;
/* http://www.pcre.org/original/doc/html/pcresyntax.html#SEC1 */
switch (c) {
/* The % character */
case '%':
part = "%";
break;
/**
* The weekday name according to the current locale, in abbreviated form or the full name.
* timegrep use only English forms as all world do
*/
case 'a':
case 'A':
part = "(Mon|Monday|Tue|Tuesday|Wed|Wednesday|Thu|Thursday|Fri|Friday|Sat|Saturday|Sun|Sunday)";
*fallback = 1;
break;
/**
* The month name according to the current locale, in abbreviated form or the full name
* timegrep use only English forms as all world do
*/
case 'b':
case 'B':
case 'h':
part = "(?P<month_t>Jan|January|Feb|February|Mar|March|Apr|April|May|Jun|June|Jul|July|Aug|August|Sep|September|Oct|October|Nov|November|Dec|December)";
nsc->month_t++;
break;
/**
* The date and time representation for the current locale
* timegrep use heuristic here
*/
case 'c':
part = NULL;
regex_index += tg_strptime_regex_nsc("%x %X", (regex == NULL ? NULL : ®ex[regex_index]), fallback, nsc);
break;
/* The century number (0-99) */
case 'C':
part = "\\d{1,2}";
*fallback = 1;
break;
/* The day of month (1-31) */
case 'd':
case 'e':
part = "(?P<day>[1-2][0-9]|3[0-1]|0?[1-9])";
nsc->day++;
break;
/* Equivalent to %m/%d/%y (American style date) */
case 'D':
part = NULL;
regex_index += tg_strptime_regex_nsc("%m/%d/%y", (regex == NULL ? NULL : ®ex[regex_index]), fallback, nsc);
break;
/* The hour (0-23) */
case 'H':
part = "(?P<hour>1[0-9]|2[0-3]|0?[0-9])";
nsc->hour++;
break;
/* The hour on a 12-hour clock (1-12) */
case 'I':
part = "(1[0-2]|0?[1-9])";
*fallback = 1;
break;
/* The day number in the year (1-366) */
case 'j':
part = "([1-2][0-9][0-9]|3[0-5][0-9]|36[0-6]|0?[1-9][0-9]|0{0,2}[1-9])";
*fallback = 1;
break;
/* The month number (1-12) */
case 'm':
part = "(?P<month>1[0-2]|0?[1-9])";
nsc->month++;
break;
/* The minute (0-59) */
case 'M':
part = "(?P<minute>[1-5][0-9]|0?[0-9])";
nsc->minute++;
break;
/* Arbitrary whitespace */
case 'n':
case 't':
part = "\\s";
break;
/**
* The locale's equivalent of AM or PM
* timegrep use only English forms as all world do
*/
case 'p':
part = "(AM|PM)";
*fallback = 1;
break;
/* The 12-hour clock time (using the locale's AM or PM), Equivalent to %I:%M:%S %p */
case 'r':
part = NULL;
regex_index += tg_strptime_regex_nsc("%I:%M:%S %p", (regex == NULL ? NULL : ®ex[regex_index]), fallback, nsc);
break;
/* Equivalent to %H:%M */
case 'R':
part = NULL;
regex_index += tg_strptime_regex_nsc("%H:%M", (regex == NULL ? NULL : ®ex[regex_index]), fallback, nsc);
break;
/* The second (0-60) */
case 'S':
part = "(?P<second>[1-5][0-9]|60|0?[0-9])";
nsc->second++;
break;
/* Equivalent to %H:%M:%S */
case 'T':
part = NULL;
regex_index += tg_strptime_regex_nsc("%H:%M:%S", (regex == NULL ? NULL : ®ex[regex_index]), fallback, nsc);
break;
/* The week number with Sunday the first day of the week (0-53) */
case 'U':
/* The week number with Monday the first day of the week (0-53) */
case 'W':
part = "([1-4][0-9]|5[0-3]|0?[0-9])";
*fallback = 1;
break;
/* The weekday number (0-6) with Sunday = 0 */
case 'w':
part = "[0-6]";
*fallback = 1;
break;
/**
* The date, using the locale's date format
* timegrep use %Y-%m-%d (also known as %F)
*/
case 'x':
part = NULL;
regex_index += tg_strptime_regex_nsc("%Y-%m-%d", (regex == NULL ? NULL : ®ex[regex_index]), fallback, nsc);
break;
/**
* The time, using the locale's time format
* timegrep use %H:%M:%S (also known as %T)
*/
case 'X':
part = NULL;
regex_index += tg_strptime_regex_nsc("%H:%M:%S", (regex == NULL ? NULL : ®ex[regex_index]), fallback, nsc);
break;
/* The year within century (0-99) */
case 'y':
part = "\\d{1,2}";
*fallback = 1;
break;
/* The year, including century (for example, 1991) */
case 'Y':
part = "(?P<year>\\d{4})";
nsc->year++;
break;
/**
* E or O modifier characters to indicate that an alternative format or specification
* not supported by timegrep
*/
case 'O':
case 'E':
errno = 0;
fprintf(stderr, gettext("%s 'O' and 'E' modifiers not supported by timegrep\n"), gettext("ERROR:"));
return SIZE_MAX;
/**
* Glibc
*/
/* Equivalent to %Y-%m-%d */
case 'F':
part = NULL;
regex_index += tg_strptime_regex_nsc("%Y-%m-%d", (regex == NULL ? NULL : ®ex[regex_index]), fallback, nsc);
break;
/* The year corresponding to the ISO week number, but without the century (0-99) */
case 'g':
part = "\\d{1,2}";
*fallback = 1;
break;
/* The year corresponding to the ISO week number */
case 'G':
part = "\\d{4}";
*fallback = 1;
break;
/* The day of the week as a decimal number (1-7, where Monday = 1) */
case 'u':
part = "[1-7]";
*fallback = 1;
break;
/* The ISO 8601:1988 week number as a decimal number (1-53) */
case 'V':
part = "([1-4][0-9]|5[0-3]|0?[1-9])";
*fallback = 1;
break;
/**
* An RFC-822/ISO 8601 standard timezone specification
* https://tools.ietf.org/html/rfc822#section-5
*/
case 'z':
part = "(?P<timezone>((\\+|\\-)\\d{2}:?\\d{2})|UT|UTC|GMT|EST|EDT|CST|CDT|MST|MDT|PST|PDT|[A-Z])";
nsc->timezone++;
break;
/**
* The timezone name
* PST8PDT, America
* Etc/UTC, Etc/GMT+2, Etc/GMT-3, Asia/Kuala_Lumpur, America/Port-au-Prince
* America/Argentina/Rio_Gallegos, America/Argentina/ComodRivadavia
*/
case 'Z':
/* FIXME: if you feel a power */
part = "[A-Za-z0-9_\\+\\-/]{3,33}";
*fallback = 1;
nsc->timezone++;
break;
/* The number of seconds since the Epoch */
case 's':
part = "(?P<timestamp>\\d{1,20})";
nsc->timestamp++;
break;
default:
errno = 0;
fprintf(stderr, gettext("%s Unexpected format char '%c'\n"), gettext("ERROR:"), c);
return SIZE_MAX;
}
if (part != NULL) {
part_length = strlen(part);
if (regex != NULL)
memcpy(®ex[regex_index], part, part_length);
regex_index += part_length;
} else if (regex_index == SIZE_MAX)
return SIZE_MAX;
} else if (memchr(escape, c, escape_length) != NULL) {
if (regex != NULL) {
regex[regex_index] = '\\';
regex[regex_index + 1] = c;
}
regex_index += 2;
} else {
if (regex != NULL)
regex[regex_index] = c;
regex_index++;
}
}
return regex_index;
}
/**
* Parse datetime format to pcre regular expression
* regex and fallback may be NULL to found result regex length
* Return fallback = 1 to force use tg_strptime
* Return length of result regex on success
* Retrun SIZE_MAX on error
*/
static size_t tg_strptime_regex(const char* format, char* regex, int* format_tz, int* fallback)
{
size_t result;
int holder;
tg_pcre_nsc nsc;
memset(&nsc, 0, sizeof(nsc));
if (fallback == NULL)
fallback = &holder;
else
*fallback = 0;
result = tg_strptime_regex_nsc(format, regex, fallback, &nsc);
if (
nsc.year > 1 ||
nsc.month > 1 ||
nsc.month_t > 1 ||
nsc.day > 1 ||
nsc.hour > 1 ||
nsc.minute > 1 ||
nsc.second > 1 ||
nsc.timezone > 1 ||
nsc.timestamp > 1 ||
(nsc.month
+ nsc.month_t) > 1 ||
(nsc.timestamp > 0 && (
nsc.year +
nsc.month +
nsc.month_t +
nsc.day +
nsc.hour +
nsc.minute +
nsc.second
) > 1)
)
*fallback = 1;
if (format_tz != NULL) {
if (nsc.timezone > 0)
*format_tz = 1;
else
*format_tz = 0;
}
return result;
}
/**
* Convert a string representation of datetime to a time_t like strptime
* Return TG_FOUND on success
* Return TG_NOT_FOUND if nothing found or convert error
*/
static int tg_strptime(
const char* string, /* source string */
const char* format, /* datetime format (see strptime) */
int format_tz, /* datetime format use timezone information */
time_t* timestamp /* result timestamp */
)
{
struct tm tm;
time_t tm_gmtoff;
memset(&tm, 0, sizeof(struct tm));
if (strptime(string, format, &tm) == NULL)
return TG_NOT_FOUND;
if (format_tz == 0)
tm_gmtoff = TG_TIMEZONE;
else
tm_gmtoff = tm.tm_gmtoff;
*timestamp = timegm(&tm) - tm_gmtoff;
if ((*timestamp) == -1)
return TG_NOT_FOUND;
return TG_FOUND;
}
/**
* Convert a string representation of integer to a int like atoi
* Return TG_ERROR on error
*/
static int tg_atoi(const char* buffer)
{
long int result;
result = strtol(buffer, NULL, 10);
if (result < 0 || result >= INT_MAX)
return TG_ERROR;
return (int)result;
}
/**
* Convert a string representation of month name to a int
* Month name buffer MUST be valid month name (tg_strptime_regex ensure it)
* Return TG_ERROR on error
*/
static int tg_atom(const char* buffer, int length)
{
if (length < 3)
return TG_ERROR;
switch (buffer[0]) {
/* Apr, Aug */
case 'A':
return (buffer[1] == 'p' ? 3 : 7);
/* Dec */
case 'D':
return 11;
/* Feb */
case 'F':
return 1;
/* Jan, Jul, Jun */
case 'J':
return (buffer[1] == 'a' ? 0 : (buffer[2] == 'n' ? 5 : 6));
/* Mar, May */
case 'M':
return (buffer[2] == 'r' ? 2 : 4);
/* Nov */
case 'N':
return 10;
/* Oct */
case 'O':
return 9;
/* Sep */
case 'S':
return 8;
}
return TG_ERROR;
}
/**
* Convert a string representation of timezone name to tm_gmtoff
* Timezone buffer MUST be valid timezone (tg_strptime_regex ensure it)
* Return LONG_MIN on error
*/
static long int tg_atogmtoff(const char* buffer, int length)
{
long int result;
if (length == 5) {
/* +0000 */
result = (((buffer[1] - '0') * 10) + (buffer[2] - '0')) * 60 * 60 + (((buffer[3] - '0') * 10) + (buffer[4] - '0')) * 60;
if (buffer[0] == '-')
result = -result;
} else if (length == 6) {
/* +00:00 */
result = (((buffer[1] - '0') * 10) + (buffer[2] - '0')) * 60 * 60 + (((buffer[4] - '0') * 10) + (buffer[5] - '0')) * 60;
if (buffer[0] == '-')
result = -result;
} else if (length == 1) {
/* military */
switch (buffer[0]) {
case 'A': result = -1; break;
case 'B': result = -2; break;
case 'C': result = -3; break;
case 'D': result = -4; break;
case 'E': result = -5; break;
case 'F': result = -6; break;
case 'G': result = -7; break;
case 'H': result = -8; break;
case 'I': result = -9; break;
case 'K': result = -10; break;
case 'L': result = -11; break;
case 'M': result = -12; break;
case 'N': result = 1; break;
case 'O': result = 2; break;
case 'P': result = 3; break;
case 'Q': result = 4; break;
case 'R': result = 5; break;
case 'S': result = 6; break;
case 'T': result = 7; break;
case 'U': result = 8; break;
case 'V': result = 9; break;
case 'W': result = 10; break;
case 'X': result = 11; break;
case 'Y': result = 12; break;
case 'Z': result = 0; break;
default:
return LONG_MIN;
}
result = result * 60 * 60;
} else if (length >= 2) {
switch (buffer[0]) {
/* UT, UTC, GMT */
case 'U':
case 'G':
result = 0;
break;
/* EST, EDT */
case 'E':
result = (buffer[1] == 'S' ? -5 : -4);
break;
/* CST, CDT */
case 'C':
result = (buffer[1] == 'S' ? -6 : -5);
break;
/* MST, MDT */
case 'M':
result = (buffer[1] == 'S' ? -7 : -6);
break;
/* PST, PDT */
case 'P':
result = (buffer[1] == 'S' ? -8 : -7);
break;
default:
return LONG_MIN;
}
result = result * 60 * 60;
} else
return LONG_MIN;
return result;
}
/**
* Convert a string representation of datetime to a time_t like strptime using precompiled named regex
* Return TG_FOUND on success
* Return TG_NOT_FOUND if nothing found or convert error
* Return TG_ERROR on error - so we need fallback
*/
static int tg_strptime_re(
const char* string, /* source string (pcre_exec subject) */
int* matches, /* offset vector that pcre_exec used */
int count, /* value returned by pcre_exec */
const tg_pcre_nsi* nsi, /* named regular expressions indexes or fallback flag */
time_t* timestamp /* result timestamp */
)
{
int result;
struct tm tm;
time_t tm_gmtoff;
char buffer[35];
memset(&tm, 0, sizeof(tm));
if (nsi->year >= 0) {
result = pcre_copy_substring(string, matches, count, nsi->year, buffer, sizeof(buffer));
if (result < 0)
return TG_ERROR;
tm.tm_year = tg_atoi(buffer) - 1900;
}
if (nsi->month >= 0) {
result = pcre_copy_substring(string, matches, count, nsi->month, buffer, sizeof(buffer));
if (result < 0)
return TG_ERROR;
tm.tm_mon = tg_atoi(buffer) - 1;
}
if (nsi->month_t >= 0) {
result = pcre_copy_substring(string, matches, count, nsi->month_t, buffer, sizeof(buffer));
if (result < 0)
return TG_ERROR;
tm.tm_mon = tg_atom(buffer, result);
}
if (nsi->day >= 0) {
result = pcre_copy_substring(string, matches, count, nsi->day, buffer, sizeof(buffer));
if (result < 0)
return TG_ERROR;
tm.tm_mday = tg_atoi(buffer);
}
if (nsi->hour >= 0) {
result = pcre_copy_substring(string, matches, count, nsi->hour, buffer, sizeof(buffer));
if (result < 0)
return TG_ERROR;
tm.tm_hour = tg_atoi(buffer);
}
if (nsi->minute >= 0) {
result = pcre_copy_substring(string, matches, count, nsi->minute, buffer, sizeof(buffer));
if (result < 0)
return TG_ERROR;
tm.tm_min = tg_atoi(buffer);
}
if (nsi->second >= 0) {
result = pcre_copy_substring(string, matches, count, nsi->second, buffer, sizeof(buffer));
if (result < 0)
return TG_ERROR;
tm.tm_sec = tg_atoi(buffer);
}
if (nsi->timezone >= 0) {
result = pcre_copy_substring(string, matches, count, nsi->timezone, buffer, sizeof(buffer));
if (result < 0)
return TG_ERROR;
tm.tm_gmtoff = tg_atogmtoff(buffer, result);
}
if (nsi->timestamp >= 0) {
result = pcre_copy_substring(string, matches, count, nsi->timestamp, buffer, sizeof(buffer));
if (result < 0)
return TG_ERROR;
*timestamp = (time_t)strtoll(buffer, NULL, 10);
return TG_FOUND;
}
if (nsi->timezone >= 0)
tm_gmtoff = tm.tm_gmtoff;
else
tm_gmtoff = TG_TIMEZONE;
*timestamp = timegm(&tm) - tm_gmtoff;
if ((*timestamp) == -1)
return TG_NOT_FOUND;
return TG_FOUND;
}
/**
* Convert a string representation of datetime to a time_t
* based on heuristic of short human input
* Return TG_FOUND on success
* Return TG_NOT_FOUND if nothing found or convert error
*/
int tg_strptime_heuristic(const char* string, time_t* timestamp)
{
if (tg_strptime(string, TG_FORMATS[0].format, 0, timestamp) == TG_FOUND)
return TG_FOUND;
if (tg_strptime(string, "%Y-%m-%d", 0, timestamp) == TG_FOUND)
return TG_FOUND;
if (tg_strptime(string, "%Y/%m/%d", 0, timestamp) == TG_FOUND)
return TG_FOUND;
if (tg_strptime(string, "%Y.%m.%d", 0, timestamp) == TG_FOUND)
return TG_FOUND;
if (tg_strptime(string, "%d-%m-%Y", 0, timestamp) == TG_FOUND)
return TG_FOUND;
if (tg_strptime(string, "%d/%m/%Y", 0, timestamp) == TG_FOUND)
return TG_FOUND;
if (tg_strptime(string, "%d.%m.%Y", 0, timestamp) == TG_FOUND)
return TG_FOUND;
return TG_NOT_FOUND;
}
/**
* Search, parse and convert datetime to timestamp from single string
* Return TG_FOUND on success
* Return TG_NOT_FOUND if nothing found, parse or convert error
* Retrun TG_ERROR on error, errno is set on system error and 0 on pcre error
*/
static int tg_get_timestamp(
const char* string, /* source string */
size_t length, /* source string length */
const tg_parser* parser, /* datetime parser context */
time_t* timestamp /* result timestamp */
)
{
int result;
const char* match;
int matches[30];
/* pcre_exec accept int as length */
if (length > (size_t)INT_MAX)
return TG_NOT_FOUND;
result = pcre_exec(parser->re, parser->extra, string, (int)length, 0, 0, matches, sizeof(matches) / sizeof(int));
if (result < 0) {
switch (result) {
case PCRE_ERROR_NOMATCH:
case PCRE_ERROR_BADUTF8:
case PCRE_ERROR_BADUTF8_OFFSET:
#ifdef PCRE_ERROR_SHORTUTF8
case PCRE_ERROR_SHORTUTF8:
#endif
return TG_NOT_FOUND;
case PCRE_ERROR_NOMEMORY:
errno = ENOMEM;
break;
default:
errno = 0;
fprintf(stderr, gettext("%s pcre_exec error %i\n"), gettext("ERROR:"), result);
}
return TG_ERROR;
}
if (parser->fallback == 0)
result = tg_strptime_re(string, matches, result, &parser->nsi, timestamp);
else {
result = pcre_get_substring(string, matches, result, 0, &match);
if (result < 0) {
if (result == PCRE_ERROR_NOMEMORY)
errno = ENOMEM;
else {
errno = 0;
fprintf(stderr, gettext("%s pcre_get_substring error\n"), gettext("ERROR:"));
}
return TG_ERROR;
}
result = tg_strptime(match, parser->format, parser->format_tz, timestamp);
pcre_free_substring(match);
}
return result;
}