/* * strftime.c -- * * This file contains a modified version of the BSD 4.4 strftime * function. * * This file is a modified version of the strftime.c file from the BSD 4.4 * source. See the copyright notice below for details on redistribution * restrictions. The "license.terms" file does not apply to this file. * * RCS: @(#) $Id: strftime.c,v 1.4 1999/07/22 01:08:04 redman Exp $ */ /* * Copyright (c) 1989 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if defined(LIBC_SCCS) static char *rcsid = "$Id: strftime.c,v 1.4 1999/07/22 01:08:04 redman Exp $"; #endif /* LIBC_SCCS */ #include #include #include #include "tclInt.h" #include "tclPort.h" #define TM_YEAR_BASE 1900 typedef struct { const char *abday[7]; const char *day[7]; const char *abmon[12]; const char *mon[12]; const char *am_pm[2]; const char *d_t_fmt; const char *d_fmt; const char *t_fmt; const char *t_fmt_ampm; } _TimeLocale; static const _TimeLocale _DefaultTimeLocale = { { "Sun","Mon","Tue","Wed","Thu","Fri","Sat", }, { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" }, { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }, { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" }, { "AM", "PM" }, "%a %b %d %H:%M:%S %Y", "%m/%d/%y", "%H:%M:%S", "%I:%M:%S %p" }; static const _TimeLocale *_CurrentTimeLocale = &_DefaultTimeLocale; static size_t gsize; static char *pt; static int _add _ANSI_ARGS_((const char* str)); static int _conv _ANSI_ARGS_((int n, int digits, int pad)); static int _secs _ANSI_ARGS_((const struct tm *t)); static size_t _fmt _ANSI_ARGS_((const char *format, const struct tm *t)); unsigned long TclpStrftime(s, maxsize, format, t) char *s; size_t maxsize; const char *format; const struct tm *t; { tzset(); pt = s; if ((gsize = maxsize) < 1) return (unsigned long)(0); if (_fmt(format, t)) { *pt = '\0'; return (unsigned long) (maxsize - gsize); } return (unsigned long)(0); } #define SUN_WEEK(t) (((t)->tm_yday + 7 - \ ((t)->tm_wday)) / 7) #define MON_WEEK(t) (((t)->tm_yday + 7 - \ ((t)->tm_wday ? (t)->tm_wday - 1 : 6)) / 7) static size_t _fmt(format, t) const char *format; const struct tm *t; { for (; *format; ++format) { if (*format == '%') { ++format; if (*format == 'E') { /* Alternate Era */ ++format; } else if (*format == 'O') { /* Alternate numeric symbols */ ++format; } switch(*format) { case '\0': --format; break; case 'A': if (t->tm_wday < 0 || t->tm_wday > 6) return(0); if (!_add(_CurrentTimeLocale->day[t->tm_wday])) return(0); continue; case 'a': if (t->tm_wday < 0 || t->tm_wday > 6) return(0); if (!_add(_CurrentTimeLocale->abday[t->tm_wday])) return(0); continue; case 'B': if (t->tm_mon < 0 || t->tm_mon > 11) return(0); if (!_add(_CurrentTimeLocale->mon[t->tm_mon])) return(0); continue; case 'b': case 'h': if (t->tm_mon < 0 || t->tm_mon > 11) return(0); if (!_add(_CurrentTimeLocale->abmon[t->tm_mon])) return(0); continue; case 'C': if (!_conv((t->tm_year + TM_YEAR_BASE) / 100, 2, '0')) return(0); continue; case 'c': if (!_fmt(_CurrentTimeLocale->d_t_fmt, t)) return(0); continue; case 'D': if (!_fmt("%m/%d/%y", t)) return(0); continue; case 'd': if (!_conv(t->tm_mday, 2, '0')) return(0); continue; case 'e': if (!_conv(t->tm_mday, 2, ' ')) return(0); continue; case 'H': if (!_conv(t->tm_hour, 2, '0')) return(0); continue; case 'I': if (!_conv(t->tm_hour % 12 ? t->tm_hour % 12 : 12, 2, '0')) return(0); continue; case 'j': if (!_conv(t->tm_yday + 1, 3, '0')) return(0); continue; case 'k': if (!_conv(t->tm_hour, 2, ' ')) return(0); continue; case 'l': if (!_conv(t->tm_hour % 12 ? t->tm_hour % 12: 12, 2, ' ')) return(0); continue; case 'M': if (!_conv(t->tm_min, 2, '0')) return(0); continue; case 'm': if (!_conv(t->tm_mon + 1, 2, '0')) return(0); continue; case 'n': if (!_add("\n")) return(0); continue; case 'p': if (!_add(_CurrentTimeLocale->am_pm[t->tm_hour >= 12])) return(0); continue; case 'R': if (!_fmt("%H:%M", t)) return(0); continue; case 'r': if (!_fmt(_CurrentTimeLocale->t_fmt_ampm, t)) return(0); continue; case 'S': if (!_conv(t->tm_sec, 2, '0')) return(0); continue; case 's': if (!_secs(t)) return(0); continue; case 'T': if (!_fmt("%H:%M:%S", t)) return(0); continue; case 't': if (!_add("\t")) return(0); continue; case 'U': if (!_conv(SUN_WEEK(t), 2, '0')) return(0); continue; case 'u': if (!_conv(t->tm_wday ? t->tm_wday : 7, 1, '0')) return(0); continue; case 'V': { /* ISO 8601 Week Of Year: If the week (Monday - Sunday) containing January 1 has four or more days in the new year, then it is week 1; otherwise it is week 53 of the previous year and the next week is week one. */ int week = MON_WEEK(t); int days = (((t)->tm_yday + 7 - \ ((t)->tm_wday ? (t)->tm_wday - 1 : 6)) % 7); if (days >= 4) { week++; } else if (week == 0) { week = 53; } if (!_conv(week, 2, '0')) return(0); continue; } case 'W': if (!_conv(MON_WEEK(t), 2, '0')) return(0); continue; case 'w': if (!_conv(t->tm_wday, 1, '0')) return(0); continue; case 'x': if (!_fmt(_CurrentTimeLocale->d_fmt, t)) return(0); continue; case 'X': if (!_fmt(_CurrentTimeLocale->t_fmt, t)) return(0); continue; case 'y': if (!_conv((t->tm_year + TM_YEAR_BASE) % 100, 2, '0')) return(0); continue; case 'Y': if (!_conv((t->tm_year + TM_YEAR_BASE), 4, '0')) return(0); continue; #ifndef MAC_TCL case 'Z': { char *name = TclpGetTZName(t->tm_isdst); if (name && !_add(name)) { return 0; } continue; } #endif case '%': /* * X311J/88-090 (4.12.3.5): if conversion char is * undefined, behavior is undefined. Print out the * character itself as printf(3) does. */ default: break; } } if (!gsize--) return(0); *pt++ = *format; } return(gsize); } static int _secs(t) const struct tm *t; { static char buf[15]; register time_t s; register char *p; struct tm tmp; /* Make a copy, mktime(3) modifies the tm struct. */ tmp = *t; s = mktime(&tmp); for (p = buf + sizeof(buf) - 2; s > 0 && p > buf; s /= 10) *p-- = (char)(s % 10 + '0'); return(_add(++p)); } static int _conv(n, digits, pad) int n, digits; int pad; { static char buf[10]; register char *p; for (p = buf + sizeof(buf) - 2; n > 0 && p > buf; n /= 10, --digits) *p-- = (char)(n % 10 + '0'); while (p > buf && digits-- > 0) *p-- = (char) pad; return(_add(++p)); } static int _add(str) const char *str; { for (;; ++pt, --gsize) { if (!gsize) return(0); if (!(*pt = *str++)) return(1); } }