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initial import
This commit is contained in:
Roland McGrath
296
time/strftime.c
Normal file
296
time/strftime.c
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@ -0,0 +1,296 @@
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/* Extensions for GNU date that are still missing here:
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-
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_
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*/
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/* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <localeinfo.h>
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#include <ctype.h>
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#include <limits.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#ifndef HAVE_GNU_LD
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#define __tzname tzname
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#define __daylight daylight
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#define __timezone timezone
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#endif
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#define add(n, f) \
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do \
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{ \
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i += (n); \
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if (i >= maxsize) \
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return 0; \
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else \
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if (p != NULL) \
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{ \
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f; \
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p += (n); \
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} \
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} while (0)
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#define cpy(n, s) add((n), memcpy((PTR) p, (PTR) (s), (n)))
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#define fmt(n, args) add((n), if (sprintf args != (n)) return 0)
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/* Return the week in the year specified by TP,
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with weeks starting on STARTING_DAY. */
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#ifdef __GNUC__
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inline
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#endif
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static unsigned int
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DEFUN(week, (tp, starting_day),
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CONST struct tm *CONST tp AND int starting_day)
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{
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int wday, dl;
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wday = tp->tm_wday - starting_day;
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if (wday < 0)
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wday += 7;
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/* Set DL to the day in the year of the last day of the week previous to the
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one containing the day specified in TP. If DL is negative or zero, the
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day specified in TP is in the first week of the year. Otherwise,
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calculate the number of complete weeks before our week (DL / 7) and
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add any partial week at the start of the year (DL % 7). */
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dl = tp->tm_yday - wday;
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return dl <= 0 ? 0 : ((dl / 7) + ((dl % 7) == 0 ? 0 : 1));
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}
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/* Write information from TP into S according to the format
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string FORMAT, writing no more that MAXSIZE characters
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(including the terminating '\0') and returning number of
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characters written. If S is NULL, nothing will be written
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anywhere, so to determine how many characters would be
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written, use NULL for S and (size_t) UINT_MAX for MAXSIZE. */
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size_t
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DEFUN(strftime, (s, maxsize, format, tp),
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char *s AND size_t maxsize AND
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CONST char *format AND register CONST struct tm *tp)
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{
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CONST char *CONST a_wkday = _time_info->abbrev_wkday[tp->tm_wday];
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CONST char *CONST f_wkday = _time_info->full_wkday[tp->tm_wday];
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CONST char *CONST a_month = _time_info->abbrev_month[tp->tm_mon];
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CONST char *CONST f_month = _time_info->full_month[tp->tm_mon];
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size_t aw_len = strlen(a_wkday);
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size_t am_len = strlen(a_month);
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size_t wkday_len = strlen(f_wkday);
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size_t month_len = strlen(f_month);
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int hour12 = tp->tm_hour;
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CONST char *CONST ampm = _time_info->ampm[hour12 >= 12];
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size_t ap_len = strlen(ampm);
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CONST unsigned int y_week0 = week(tp, 0);
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CONST unsigned int y_week1 = week(tp, 1);
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CONST char *zone;
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size_t zonelen;
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register size_t i = 0;
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register char *p = s;
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register CONST char *f;
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if (tp->tm_isdst < 0)
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{
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zone = "";
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zonelen = 0;
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}
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else
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{
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zone = __tzname[tp->tm_isdst];
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zonelen = strlen(zone);
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}
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if (hour12 > 12)
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hour12 -= 12;
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else
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if (hour12 == 0) hour12 = 12;
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for (f = format; *f != '\0'; ++f)
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{
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CONST char *subfmt;
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if (!isascii(*f))
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{
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/* Non-ASCII, may be a multibyte. */
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int len = mblen(f, strlen(f));
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if (len > 0)
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{
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cpy(len, f);
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continue;
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}
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}
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if (*f != '%')
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{
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add(1, *p = *f);
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continue;
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}
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++f;
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switch (*f)
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{
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case '\0':
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case '%':
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add(1, *p = *f);
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break;
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case 'a':
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cpy(aw_len, a_wkday);
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break;
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case 'A':
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cpy(wkday_len, f_wkday);
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break;
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case 'b':
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case 'h': /* GNU extension. */
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cpy(am_len, a_month);
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break;
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case 'B':
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cpy(month_len, f_month);
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break;
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case 'c':
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subfmt = _time_info->date_time;
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subformat:
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{
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size_t len = strftime (p, maxsize - i, subfmt, tp);
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add(len, );
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}
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break;
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case 'C':
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fmt (2, (p, "%.2d", (1900 + tp->tm_year) / 100));
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break;
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case 'D': /* GNU extension. */
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subfmt = "%m/%d/%y";
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goto subformat;
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case 'd':
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fmt(2, (p, "%.2d", tp->tm_mday));
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break;
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case 'e': /* GNU extension: %d, but blank-padded. */
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fmt(2, (p, "%2d", tp->tm_mday));
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break;
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case 'H':
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fmt(2, (p, "%.2d", tp->tm_hour));
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break;
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case 'I':
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fmt(2, (p, "%.2d", hour12));
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break;
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case 'k': /* GNU extension. */
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fmt(2, (p, "%2d", tp->tm_hour));
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break;
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case 'l': /* GNU extension. */
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fmt(2, (p, "%2d", hour12));
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break;
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case 'j':
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fmt(3, (p, "%.3d", 1 + tp->tm_yday));
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break;
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case 'M':
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fmt(2, (p, "%.2d", tp->tm_min));
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break;
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case 'm':
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fmt(2, (p, "%.2d", tp->tm_mon + 1));
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break;
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case 'n': /* GNU extension. */
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add (1, *p = '\n');
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break;
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case 'p':
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cpy(ap_len, ampm);
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break;
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case 'R': /* GNU extension. */
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subfmt = "%H:%M";
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goto subformat;
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case 'r': /* GNU extension. */
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subfmt = "%I:%M:%S %p";
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goto subformat;
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case 'S':
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fmt(2, (p, "%.2d", tp->tm_sec));
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break;
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case 'T': /* GNU extenstion. */
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subfmt = "%H:%M:%S";
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goto subformat;
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case 't': /* GNU extenstion. */
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add (1, *p = '\t');
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break;
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case 'U':
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fmt(2, (p, "%.2u", y_week0));
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break;
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case 'W':
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fmt(2, (p, "%.2u", y_week1));
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break;
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case 'w':
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fmt(2, (p, "%.2d", tp->tm_wday));
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break;
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case 'X':
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subfmt = _time_info->time;
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goto subformat;
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case 'x':
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subfmt = _time_info->date;
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goto subformat;
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case 'Y':
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fmt(4, (p, "%.4d", 1900 + tp->tm_year));
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break;
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case 'y':
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fmt(2, (p, "%.2d", tp->tm_year));
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break;
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case 'Z':
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cpy(zonelen, zone);
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break;
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default:
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/* Bad format. */
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break;
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}
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}
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if (p != NULL)
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*p = '\0';
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return i;
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}
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