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345 lines
8.9 KiB
C
345 lines
8.9 KiB
C
/** strptime workaround (for oa macos leopard)
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* This strptime follows the man strptime (2001-11-12)
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* conforming to SUSv2, POSIX.1-2001
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*
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* This very simple version of strptime has no:
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* - E alternatives
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* - O alternatives
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* - Glibc additions
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* - Does not process week numbers
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* - Does not properly processes year day
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*
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* LICENSE
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* Copyright (c) 2008, NLnet Labs, Matthijs Mekking
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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 are met:
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * 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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* * Neither the name of NLnetLabs nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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**/
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#include "config.h"
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#ifndef HAVE_CONFIG_H
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#include <time.h>
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#endif
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#ifndef STRPTIME_WORKS
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#define TM_YEAR_BASE 1900
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#include <ctype.h>
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#include <string.h>
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static const char *abb_weekdays[] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", NULL
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};
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static const char *full_weekdays[] = {
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"Sunday", "Monday", "Tuesday", "Wednesday",
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"Thursday", "Friday", "Saturday", NULL
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};
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static const char *abb_months[] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec", NULL
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};
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static const char *full_months[] = {
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"January", "February", "March", "April", "May", "June",
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"July", "August", "September", "October", "November", "December", NULL
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};
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static const char *ampm[] = {
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"am", "pm", NULL
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};
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static int
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match_string(const char **buf, const char **strs)
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{
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int i = 0;
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for (i = 0; strs[i] != NULL; i++) {
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int len = strlen(strs[i]);
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if (strncasecmp (*buf, strs[i], len) == 0) {
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*buf += len;
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return i;
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}
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}
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return -1;
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}
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static int
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str2int(const char **buf, int max)
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{
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int ret=0, count=0;
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while (*buf[0] != '\0' && isdigit(*buf[0]) && count<max) {
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ret = ret*10 + (*buf[0] - '0');
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(*buf)++;
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count++;
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}
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if (!count)
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return -1;
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return ret;
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}
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/** Converts the character string s to values which are stored in tm
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* using the format specified by format
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**/
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char *
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unbound_strptime(const char *s, const char *format, struct tm *tm)
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{
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int c, ret;
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int split_year = 0;
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while ((c = *format) != '\0') {
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/* whitespace, literal or format */
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if (isspace(c)) { /* whitespace */
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/** whitespace matches zero or more whitespace characters in the
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* input string.
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**/
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while (isspace(*s))
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s++;
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}
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else if (c == '%') { /* format */
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format++;
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c = *format;
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switch (c) {
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case '%': /* %% is converted to % */
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if (*s != c) {
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return NULL;
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}
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s++;
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break;
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case 'a': /* weekday name, abbreviated or full */
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case 'A':
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ret = match_string(&s, full_weekdays);
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if (ret < 0)
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ret = match_string(&s, abb_weekdays);
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if (ret < 0) {
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return NULL;
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}
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tm->tm_wday = ret;
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break;
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case 'b': /* month name, abbreviated or full */
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case 'B':
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case 'h':
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ret = match_string(&s, full_months);
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if (ret < 0)
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ret = match_string(&s, abb_months);
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if (ret < 0) {
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return NULL;
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}
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tm->tm_mon = ret;
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break;
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case 'c': /* date and time representation */
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if (!(s = unbound_strptime(s, "%x %X", tm))) {
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return NULL;
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}
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break;
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case 'C': /* century number */
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ret = str2int(&s, 2);
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if (ret < 0 || ret > 99) { /* must be in [00,99] */
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return NULL;
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}
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if (split_year) {
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tm->tm_year = ret*100 + (tm->tm_year%100);
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}
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else {
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tm->tm_year = ret*100 - TM_YEAR_BASE;
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split_year = 1;
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}
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break;
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case 'd': /* day of month */
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case 'e':
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ret = str2int(&s, 2);
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if (ret < 1 || ret > 31) { /* must be in [01,31] */
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return NULL;
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}
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tm->tm_mday = ret;
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break;
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case 'D': /* equivalent to %m/%d/%y */
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if (!(s = unbound_strptime(s, "%m/%d/%y", tm))) {
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return NULL;
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}
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break;
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case 'H': /* hour */
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ret = str2int(&s, 2);
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if (ret < 0 || ret > 23) { /* must be in [00,23] */
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return NULL;
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}
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tm->tm_hour = ret;
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break;
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case 'I': /* 12hr clock hour */
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ret = str2int(&s, 2);
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if (ret < 1 || ret > 12) { /* must be in [01,12] */
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return NULL;
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}
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if (ret == 12) /* actually [0,11] */
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ret = 0;
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tm->tm_hour = ret;
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break;
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case 'j': /* day of year */
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ret = str2int(&s, 2);
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if (ret < 1 || ret > 366) { /* must be in [001,366] */
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return NULL;
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}
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tm->tm_yday = ret;
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break;
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case 'm': /* month */
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ret = str2int(&s, 2);
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if (ret < 1 || ret > 12) { /* must be in [01,12] */
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return NULL;
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}
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/* months go from 0-11 */
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tm->tm_mon = (ret-1);
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break;
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case 'M': /* minute */
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ret = str2int(&s, 2);
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if (ret < 0 || ret > 59) { /* must be in [00,59] */
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return NULL;
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}
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tm->tm_min = ret;
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break;
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case 'n': /* arbitrary whitespace */
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case 't':
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while (isspace(*s))
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s++;
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break;
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case 'p': /* am pm */
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ret = match_string(&s, ampm);
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if (ret < 0) {
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return NULL;
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}
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if (tm->tm_hour < 0 || tm->tm_hour > 11) { /* %I */
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return NULL;
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}
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if (ret == 1) /* pm */
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tm->tm_hour += 12;
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break;
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case 'r': /* equivalent of %I:%M:%S %p */
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if (!(s = unbound_strptime(s, "%I:%M:%S %p", tm))) {
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return NULL;
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}
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break;
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case 'R': /* equivalent of %H:%M */
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if (!(s = unbound_strptime(s, "%H:%M", tm))) {
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return NULL;
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}
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break;
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case 'S': /* seconds */
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ret = str2int(&s, 2);
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/* 60 may occur for leap seconds */
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/* earlier 61 was also allowed */
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if (ret < 0 || ret > 60) { /* must be in [00,60] */
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return NULL;
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}
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tm->tm_sec = ret;
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break;
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case 'T': /* equivalent of %H:%M:%S */
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if (!(s = unbound_strptime(s, "%H:%M:%S", tm))) {
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return NULL;
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}
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break;
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case 'U': /* week number, with the first Sun of Jan being w1 */
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ret = str2int(&s, 2);
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if (ret < 0 || ret > 53) { /* must be in [00,53] */
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return NULL;
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}
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/** it is hard (and not necessary for nsd) to determine time
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* data from week number.
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**/
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break;
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case 'w': /* day of week */
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ret = str2int(&s, 1);
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if (ret < 0 || ret > 6) { /* must be in [0,6] */
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return NULL;
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}
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tm->tm_wday = ret;
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break;
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case 'W': /* week number, with the first Mon of Jan being w1 */
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ret = str2int(&s, 2);
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if (ret < 0 || ret > 53) { /* must be in [00,53] */
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return NULL;
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}
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/** it is hard (and not necessary for nsd) to determine time
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* data from week number.
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**/
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break;
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case 'x': /* date format */
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if (!(s = unbound_strptime(s, "%m/%d/%y", tm))) {
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return NULL;
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}
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break;
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case 'X': /* time format */
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if (!(s = unbound_strptime(s, "%H:%M:%S", tm))) {
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return NULL;
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}
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break;
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case 'y': /* last two digits of a year */
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ret = str2int(&s, 2);
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if (ret < 0 || ret > 99) { /* must be in [00,99] */
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return NULL;
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}
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if (split_year) {
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tm->tm_year = ((tm->tm_year/100) * 100) + ret;
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}
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else {
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split_year = 1;
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/** currently:
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* if in [0,68] we are in 21th century,
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* if in [69,99] we are in 20th century.
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**/
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if (ret < 69) /* 2000 */
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ret += 100;
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tm->tm_year = ret;
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}
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break;
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case 'Y': /* year */
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ret = str2int(&s, 4);
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if (ret < 0 || ret > 9999) {
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return NULL;
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}
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tm->tm_year = ret - TM_YEAR_BASE;
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break;
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case '\0':
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default: /* unsupported, cannot match format */
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return NULL;
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break;
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}
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}
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else { /* literal */
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/* if input cannot match format, return NULL */
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if (*s != c)
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return NULL;
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s++;
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}
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format++;
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}
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/* return pointer to remainder of s */
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return (char*) s;
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}
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#endif /* STRPTIME_WORKS */
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