397 lines
8.3 KiB
C
397 lines
8.3 KiB
C
/*
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* Copyright (c) 1999 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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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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*
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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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*
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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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* 3. Neither the name of KTH nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY KTH AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KTH OR ITS 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
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "roken.h"
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RCSID("$Id: strftime.c,v 1.10 1999/11/13 04:18:33 assar Exp $");
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static const char *abb_weekdays[] = {
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"Sun",
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"Mon",
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"Tue",
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"Wed",
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"Thu",
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"Fri",
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"Sat",
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};
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static const char *full_weekdays[] = {
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"Sunday",
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"Monday",
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"Tuesday",
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"Wednesday",
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"Thursday",
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"Friday",
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"Saturday",
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};
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static const char *abb_month[] = {
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"Jan",
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"Feb",
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"Mar",
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"Apr",
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"May",
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"Jun",
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"Jul",
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"Aug",
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"Sep",
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"Oct",
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"Nov",
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"Dec"
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};
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static const char *full_month[] = {
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"January",
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"February",
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"Mars",
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"April",
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"May",
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"June",
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"July",
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"August",
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"September",
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"October",
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"November",
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"December"
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};
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static const char *ampm[] = {
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"AM",
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"PM"
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};
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/*
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* Convert hour in [0, 24] to [12 1 - 11 12 1 - 11 12]
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*/
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static int
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hour_24to12 (int hour)
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{
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int ret = hour % 12;
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if (ret == 0)
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ret = 12;
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return ret;
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}
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/*
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* Return AM or PM for `hour'
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*/
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static const char *
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hour_to_ampm (int hour)
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{
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return ampm[hour / 12];
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}
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/*
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* Return the week number of `tm' (Sunday being the first day of the week)
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* as [0, 53]
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*/
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static int
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week_number_sun (const struct tm *tm)
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{
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return (tm->tm_yday + 7 - (tm->tm_yday % 7 - tm->tm_wday + 7) % 7) / 7;
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}
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/*
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* Return the week number of `tm' (Monday being the first day of the week)
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* as [0, 53]
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*/
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static int
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week_number_mon (const struct tm *tm)
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{
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int wday = (tm->tm_wday + 6) % 7;
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return (tm->tm_yday + 7 - (tm->tm_yday % 7 - wday + 7) % 7) / 7;
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}
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/*
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* Return the week number of `tm' (Monday being the first day of the
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* week) as [01, 53]. Week number one is the one that has four or more
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* days in that year.
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*/
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static int
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week_number_mon4 (const struct tm *tm)
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{
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int wday = (tm->tm_wday + 6) % 7;
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int w1day = (wday - tm->tm_yday % 7 + 7) % 7;
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int ret;
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ret = (tm->tm_yday + w1day) / 7;
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if (w1day >= 4)
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--ret;
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if (ret == -1)
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ret = 53;
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else
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++ret;
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return ret;
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}
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/*
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*
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*/
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size_t
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strftime (char *buf, size_t maxsize, const char *format,
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const struct tm *tm)
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{
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size_t n = 0;
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size_t ret;
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while (*format != '\0' && n < maxsize) {
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if (*format == '%') {
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++format;
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if(*format == 'E' || *format == 'O')
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++format;
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switch (*format) {
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case 'a' :
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ret = snprintf (buf, maxsize - n,
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"%s", abb_weekdays[tm->tm_wday]);
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break;
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case 'A' :
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ret = snprintf (buf, maxsize - n,
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"%s", full_weekdays[tm->tm_wday]);
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break;
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case 'h' :
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case 'b' :
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ret = snprintf (buf, maxsize - n,
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"%s", abb_month[tm->tm_mon]);
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break;
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case 'B' :
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ret = snprintf (buf, maxsize - n,
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"%s", full_month[tm->tm_mon]);
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break;
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case 'c' :
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ret = snprintf (buf, maxsize - n,
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"%d:%02d:%02d %02d:%02d:%02d",
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tm->tm_year,
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tm->tm_mon + 1,
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tm->tm_mday,
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tm->tm_hour,
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tm->tm_min,
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tm->tm_sec);
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break;
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case 'C' :
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ret = snprintf (buf, maxsize - n,
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"%02d", (tm->tm_year + 1900) / 100);
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break;
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case 'd' :
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ret = snprintf (buf, maxsize - n,
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"%02d", tm->tm_mday);
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break;
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case 'D' :
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ret = snprintf (buf, maxsize - n,
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"%02d/%02d/%02d",
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tm->tm_mon + 1,
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tm->tm_mday,
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(tm->tm_year + 1900) % 100);
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break;
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case 'e' :
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ret = snprintf (buf, maxsize - n,
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"%2d", tm->tm_mday);
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break;
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case 'F':
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ret = snprintf (buf, maxsize - n,
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"%04d-%02d-%02d", tm->tm_year + 1900,
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tm->tm_mon + 1, tm->tm_mday);
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break;
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case 'g':
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/* last two digits of week-based year */
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abort();
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case 'G':
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/* week-based year */
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abort();
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case 'H' :
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ret = snprintf (buf, maxsize - n,
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"%02d", tm->tm_hour);
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break;
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case 'I' :
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ret = snprintf (buf, maxsize - n,
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"%02d",
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hour_24to12 (tm->tm_hour));
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break;
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case 'j' :
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ret = snprintf (buf, maxsize - n,
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"%03d", tm->tm_yday + 1);
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break;
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case 'k' :
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ret = snprintf (buf, maxsize - n,
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"%2d", tm->tm_hour);
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break;
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case 'l' :
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ret = snprintf (buf, maxsize - n,
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"%2d",
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hour_24to12 (tm->tm_hour));
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break;
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case 'm' :
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ret = snprintf (buf, maxsize - n,
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"%02d", tm->tm_mon + 1);
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break;
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case 'M' :
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ret = snprintf (buf, maxsize - n,
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"%02d", tm->tm_min);
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break;
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case 'n' :
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ret = snprintf (buf, maxsize - n, "\n");
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break;
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case 'p' :
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ret = snprintf (buf, maxsize - n, "%s",
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hour_to_ampm (tm->tm_hour));
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break;
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case 'r' :
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ret = snprintf (buf, maxsize - n,
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"%02d:%02d:%02d %s",
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hour_24to12 (tm->tm_hour),
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tm->tm_min,
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tm->tm_sec,
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hour_to_ampm (tm->tm_hour));
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break;
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case 'R' :
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ret = snprintf (buf, maxsize - n,
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"%02d:%02d",
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tm->tm_hour,
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tm->tm_min);
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case 's' :
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ret = snprintf (buf, maxsize - n,
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"%d", (int)mktime((struct tm *)tm));
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break;
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case 'S' :
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ret = snprintf (buf, maxsize - n,
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"%02d", tm->tm_sec);
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break;
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case 't' :
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ret = snprintf (buf, maxsize - n, "\t");
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break;
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case 'T' :
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case 'X' :
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ret = snprintf (buf, maxsize - n,
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"%02d:%02d:%02d",
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tm->tm_hour,
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tm->tm_min,
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tm->tm_sec);
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break;
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case 'u' :
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ret = snprintf (buf, maxsize - n,
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"%d", (tm->tm_wday == 0) ? 7 : tm->tm_wday);
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break;
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case 'U' :
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ret = snprintf (buf, maxsize - n,
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"%02d", week_number_sun (tm));
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break;
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case 'V' :
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ret = snprintf (buf, maxsize - n,
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"%02d", week_number_mon4 (tm));
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break;
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case 'w' :
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ret = snprintf (buf, maxsize - n,
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"%d", tm->tm_wday);
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break;
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case 'W' :
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ret = snprintf (buf, maxsize - n,
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"%02d", week_number_mon (tm));
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break;
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case 'x' :
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ret = snprintf (buf, maxsize - n,
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"%d:%02d:%02d",
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tm->tm_year,
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tm->tm_mon + 1,
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tm->tm_mday);
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break;
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case 'y' :
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ret = snprintf (buf, maxsize - n,
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"%02d", (tm->tm_year + 1900) % 100);
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break;
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case 'Y' :
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ret = snprintf (buf, maxsize - n,
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"%d", tm->tm_year + 1900);
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break;
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case 'z':
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ret = snprintf (buf, maxsize - n,
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"%ld",
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#if defined(HAVE_STRUCT_TM_TM_GMTOFF)
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(long)tm->tm_gmtoff
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#elif defined(HAVE_TIMEZONE)
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tm->tm_isdst ?
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(long)altzone :
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(long)timezone
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#else
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#error Where in timezone chaos are you?
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#endif
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);
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break;
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case 'Z' :
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ret = snprintf (buf, maxsize - n,
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"%s",
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#if defined(HAVE_STRUCT_TM_TM_ZONE)
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tm->tm_zone
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#elif defined(HAVE_TIMEZONE)
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tzname[tm->tm_isdst]
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#else
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#error what?
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#endif
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);
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break;
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case '\0' :
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--format;
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/* FALLTHROUGH */
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case '%' :
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ret = snprintf (buf, maxsize - n,
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"%%");
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break;
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default :
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ret = snprintf (buf, maxsize - n,
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"%%%c", *format);
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break;
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}
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if (ret >= maxsize - n)
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return 0;
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n += ret;
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buf += ret;
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++format;
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} else {
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*buf++ = *format++;
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++n;
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}
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}
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*buf++ = '\0';
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return n;
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}
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