329 lines
8.2 KiB
C
329 lines
8.2 KiB
C
/* tdate_parse - parse string dates into internal form, stripped-down version
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**
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** Copyright © 1995 by Jef Poskanzer <jef@mail.acme.com>.
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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** ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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** SUCH DAMAGE.
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*/
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/* This is a stripped-down version of date_parse.c, available at
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** http://www.acme.com/software/date_parse/
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*/
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#include <sys/types.h>
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#include <ctype.h>
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#ifdef HAVE_MEMORY_H
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#include <memory.h>
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#endif
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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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#include <time.h>
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#include "tdate_parse.h"
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struct strlong {
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char* s;
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long l;
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};
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static void
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pound_case( char* str )
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{
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for ( ; *str != '\0'; ++str )
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{
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if ( isupper( (int) *str ) )
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*str = tolower( (int) *str );
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}
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}
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static int
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strlong_compare( const void* v1, const void* v2 )
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{
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const struct strlong* s1 = (const struct strlong*) v1;
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const struct strlong* s2 = (const struct strlong*) v2;
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return strcmp( s1->s, s2->s );
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}
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static int
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strlong_search( char* str, struct strlong* tab, int n, long* lP )
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{
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int i, h, l, r;
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l = 0;
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h = n - 1;
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for (;;)
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{
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i = ( h + l ) / 2;
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r = strcmp( str, tab[i].s );
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if ( r < 0 )
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h = i - 1;
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else if ( r > 0 )
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l = i + 1;
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else
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{
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*lP = tab[i].l;
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return 1;
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}
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if ( h < l )
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return 0;
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}
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}
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static int
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scan_wday( char* str_wday, long* tm_wdayP )
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{
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static struct strlong wday_tab[] = {
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{ "sun", 0 }, { "sunday", 0 },
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{ "mon", 1 }, { "monday", 1 },
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{ "tue", 2 }, { "tuesday", 2 },
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{ "wed", 3 }, { "wednesday", 3 },
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{ "thu", 4 }, { "thursday", 4 },
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{ "fri", 5 }, { "friday", 5 },
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{ "sat", 6 }, { "saturday", 6 },
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};
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static int sorted = 0;
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if ( ! sorted )
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{
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(void) qsort(
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wday_tab, sizeof(wday_tab)/sizeof(struct strlong),
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sizeof(struct strlong), strlong_compare );
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sorted = 1;
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}
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pound_case( str_wday );
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return strlong_search(
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str_wday, wday_tab, sizeof(wday_tab)/sizeof(struct strlong), tm_wdayP );
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}
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static int
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scan_mon( char* str_mon, long* tm_monP )
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{
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static struct strlong mon_tab[] = {
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{ "jan", 0 }, { "january", 0 },
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{ "feb", 1 }, { "february", 1 },
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{ "mar", 2 }, { "march", 2 },
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{ "apr", 3 }, { "april", 3 },
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{ "may", 4 },
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{ "jun", 5 }, { "june", 5 },
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{ "jul", 6 }, { "july", 6 },
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{ "aug", 7 }, { "august", 7 },
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{ "sep", 8 }, { "september", 8 },
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{ "oct", 9 }, { "october", 9 },
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{ "nov", 10 }, { "november", 10 },
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{ "dec", 11 }, { "december", 11 },
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};
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static int sorted = 0;
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if ( ! sorted )
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{
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(void) qsort(
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mon_tab, sizeof(mon_tab)/sizeof(struct strlong),
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sizeof(struct strlong), strlong_compare );
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sorted = 1;
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}
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pound_case( str_mon );
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return strlong_search(
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str_mon, mon_tab, sizeof(mon_tab)/sizeof(struct strlong), tm_monP );
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}
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static int
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is_leap( int year )
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{
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return year % 400? ( year % 100 ? ( year % 4 ? 0 : 1 ) : 0 ) : 1;
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}
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/* Basically the same as mktime(). */
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static time_t
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tm_to_time( struct tm* tmP )
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{
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time_t t;
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static int monthtab[12] = {
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0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
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/* Years since epoch, converted to days. */
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t = ( tmP->tm_year - 70 ) * 365;
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/* Leap days for previous years - this will break in 2100! */
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t += ( tmP->tm_year - 69 ) / 4;
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/* Days for the beginning of this month. */
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t += monthtab[tmP->tm_mon];
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/* Leap day for this year. */
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if ( tmP->tm_mon >= 2 && is_leap( tmP->tm_year + 1900 ) )
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++t;
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/* Days since the beginning of this month. */
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t += tmP->tm_mday - 1; /* 1-based field */
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/* Hours, minutes, and seconds. */
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t = t * 24 + tmP->tm_hour;
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t = t * 60 + tmP->tm_min;
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t = t * 60 + tmP->tm_sec;
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return t;
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}
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time_t
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tdate_parse( char* str )
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{
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struct tm tm;
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char* cp;
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char str_mon[500], str_wday[500];
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int tm_sec, tm_min, tm_hour, tm_mday, tm_year;
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long tm_mon, tm_wday;
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time_t t;
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/* Initialize. */
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(void) memset( (char*) &tm, 0, sizeof(struct tm) );
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/* Skip initial whitespace ourselves - sscanf is clumsy at this. */
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for ( cp = str; *cp == ' ' || *cp == '\t'; ++cp )
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continue;
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/* And do the sscanfs. WARNING: you can add more formats here,
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** but be careful! You can easily screw up the parsing of existing
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** formats when you add new ones. The order is important.
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*/
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/* DD-mth-YY HH:MM:SS GMT */
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if ( sscanf( cp, "%d-%400[a-zA-Z]-%d %d:%d:%d GMT",
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&tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,
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&tm_sec ) == 6 &&
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scan_mon( str_mon, &tm_mon ) )
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{
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tm.tm_mday = tm_mday;
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tm.tm_mon = tm_mon;
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tm.tm_year = tm_year;
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tm.tm_hour = tm_hour;
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tm.tm_min = tm_min;
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tm.tm_sec = tm_sec;
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}
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/* DD mth YY HH:MM:SS GMT */
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else if ( sscanf( cp, "%d %400[a-zA-Z] %d %d:%d:%d GMT",
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&tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,
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&tm_sec) == 6 &&
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scan_mon( str_mon, &tm_mon ) )
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{
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tm.tm_mday = tm_mday;
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tm.tm_mon = tm_mon;
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tm.tm_year = tm_year;
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tm.tm_hour = tm_hour;
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tm.tm_min = tm_min;
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tm.tm_sec = tm_sec;
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}
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/* HH:MM:SS GMT DD-mth-YY */
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else if ( sscanf( cp, "%d:%d:%d GMT %d-%400[a-zA-Z]-%d",
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&tm_hour, &tm_min, &tm_sec, &tm_mday, str_mon,
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&tm_year ) == 6 &&
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scan_mon( str_mon, &tm_mon ) )
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{
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tm.tm_hour = tm_hour;
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tm.tm_min = tm_min;
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tm.tm_sec = tm_sec;
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tm.tm_mday = tm_mday;
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tm.tm_mon = tm_mon;
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tm.tm_year = tm_year;
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}
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/* HH:MM:SS GMT DD mth YY */
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else if ( sscanf( cp, "%d:%d:%d GMT %d %400[a-zA-Z] %d",
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&tm_hour, &tm_min, &tm_sec, &tm_mday, str_mon,
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&tm_year ) == 6 &&
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scan_mon( str_mon, &tm_mon ) )
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{
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tm.tm_hour = tm_hour;
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tm.tm_min = tm_min;
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tm.tm_sec = tm_sec;
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tm.tm_mday = tm_mday;
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tm.tm_mon = tm_mon;
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tm.tm_year = tm_year;
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}
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/* wdy, DD-mth-YY HH:MM:SS GMT */
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else if ( sscanf( cp, "%400[a-zA-Z], %d-%400[a-zA-Z]-%d %d:%d:%d GMT",
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str_wday, &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,
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&tm_sec ) == 7 &&
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scan_wday( str_wday, &tm_wday ) &&
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scan_mon( str_mon, &tm_mon ) )
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{
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tm.tm_wday = tm_wday;
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tm.tm_mday = tm_mday;
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tm.tm_mon = tm_mon;
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tm.tm_year = tm_year;
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tm.tm_hour = tm_hour;
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tm.tm_min = tm_min;
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tm.tm_sec = tm_sec;
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}
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/* wdy, DD mth YY HH:MM:SS GMT */
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else if ( sscanf( cp, "%400[a-zA-Z], %d %400[a-zA-Z] %d %d:%d:%d GMT",
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str_wday, &tm_mday, str_mon, &tm_year, &tm_hour, &tm_min,
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&tm_sec ) == 7 &&
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scan_wday( str_wday, &tm_wday ) &&
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scan_mon( str_mon, &tm_mon ) )
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{
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tm.tm_wday = tm_wday;
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tm.tm_mday = tm_mday;
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tm.tm_mon = tm_mon;
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tm.tm_year = tm_year;
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tm.tm_hour = tm_hour;
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tm.tm_min = tm_min;
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tm.tm_sec = tm_sec;
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}
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/* wdy mth DD HH:MM:SS GMT YY */
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else if ( sscanf( cp, "%400[a-zA-Z] %400[a-zA-Z] %d %d:%d:%d GMT %d",
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str_wday, str_mon, &tm_mday, &tm_hour, &tm_min, &tm_sec,
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&tm_year ) == 7 &&
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scan_wday( str_wday, &tm_wday ) &&
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scan_mon( str_mon, &tm_mon ) )
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{
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tm.tm_wday = tm_wday;
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tm.tm_mon = tm_mon;
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tm.tm_mday = tm_mday;
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tm.tm_hour = tm_hour;
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tm.tm_min = tm_min;
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tm.tm_sec = tm_sec;
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tm.tm_year = tm_year;
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}
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else
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return (time_t) -1;
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if ( tm.tm_year > 1900 )
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tm.tm_year -= 1900;
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else if ( tm.tm_year < 70 )
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tm.tm_year += 100;
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t = tm_to_time( &tm );
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return t;
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}
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