| /* $OpenBSD: strptime.c,v 1.11 2005/08/08 08:05:38 espie Exp $ */ |
| /* $NetBSD: strptime.c,v 1.12 1998/01/20 21:39:40 mycroft Exp $ */ |
| |
| /*- |
| * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. |
| * All rights reserved. |
| * |
| * This code was contributed to The NetBSD Foundation by Klaus Klein. |
| * |
| * 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 NetBSD |
| * Foundation, Inc. and its contributors. |
| * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. |
| */ |
| |
| //#include <sys/localedef.h> |
| #include <ctype.h> |
| #include <locale.h> |
| #include <string.h> |
| #include <time.h> |
| #include "tzfile.h" |
| |
| static const 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; |
| } _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" |
| }; |
| |
| #define _ctloc(x) (_DefaultTimeLocale.x) |
| |
| /* |
| * We do not implement alternate representations. However, we always |
| * check whether a given modifier is allowed for a certain conversion. |
| */ |
| #define _ALT_E 0x01 |
| #define _ALT_O 0x02 |
| #define _LEGAL_ALT(x) { if (alt_format & ~(x)) return (0); } |
| |
| |
| struct century_relyear { |
| int century; |
| int relyear; |
| }; |
| static int _conv_num(const unsigned char **, int *, int, int); |
| static unsigned char *_strptime(const unsigned char *, const char *, struct tm *, |
| struct century_relyear *); |
| |
| |
| char * |
| strptime(const char *buf, const char *fmt, struct tm *tm) |
| { |
| struct century_relyear cr; |
| cr.century = TM_YEAR_BASE; |
| cr.relyear = -1; |
| return (char*)(_strptime((const unsigned char*)buf, fmt, tm, &cr)); |
| } |
| |
| static unsigned char * |
| _strptime(const unsigned char *buf, const char *fmt, struct tm *tm, struct century_relyear *cr) |
| { |
| unsigned char c; |
| const unsigned char *bp; |
| size_t len = 0; |
| int alt_format, i; |
| |
| bp = (unsigned char *)buf; |
| while ((c = *fmt) != '\0') { |
| /* Clear `alternate' modifier prior to new conversion. */ |
| alt_format = 0; |
| |
| /* Eat up white-space. */ |
| if (isspace(c)) { |
| while (isspace(*bp)) |
| bp++; |
| |
| fmt++; |
| continue; |
| } |
| |
| if ((c = *fmt++) != '%') |
| goto literal; |
| |
| |
| again: switch (c = *fmt++) { |
| case '%': /* "%%" is converted to "%". */ |
| literal: |
| if (c != *bp++) |
| return (NULL); |
| |
| break; |
| |
| /* |
| * "Alternative" modifiers. Just set the appropriate flag |
| * and start over again. |
| */ |
| case 'E': /* "%E?" alternative conversion modifier. */ |
| _LEGAL_ALT(0); |
| alt_format |= _ALT_E; |
| goto again; |
| |
| case 'O': /* "%O?" alternative conversion modifier. */ |
| _LEGAL_ALT(0); |
| alt_format |= _ALT_O; |
| goto again; |
| |
| /* |
| * "Complex" conversion rules, implemented through recursion. |
| */ |
| case 'c': /* Date and time, using the locale's format. */ |
| _LEGAL_ALT(_ALT_E); |
| if (!(bp = _strptime(bp, _ctloc(d_t_fmt), tm, cr))) |
| return (NULL); |
| break; |
| |
| case 'D': /* The date as "%m/%d/%y". */ |
| _LEGAL_ALT(0); |
| if (!(bp = _strptime(bp, "%m/%d/%y", tm, cr))) |
| return (NULL); |
| break; |
| |
| case 'R': /* The time as "%H:%M". */ |
| _LEGAL_ALT(0); |
| if (!(bp = _strptime(bp, "%H:%M", tm, cr))) |
| return (NULL); |
| break; |
| |
| case 'r': /* The time as "%I:%M:%S %p". */ |
| _LEGAL_ALT(0); |
| if (!(bp = _strptime(bp, "%I:%M:%S %p", tm, cr))) |
| return (NULL); |
| break; |
| |
| case 'T': /* The time as "%H:%M:%S". */ |
| _LEGAL_ALT(0); |
| if (!(bp = _strptime(bp, "%H:%M:%S", tm, cr))) |
| return (NULL); |
| break; |
| |
| case 'X': /* The time, using the locale's format. */ |
| _LEGAL_ALT(_ALT_E); |
| if (!(bp = _strptime(bp, _ctloc(t_fmt), tm, cr))) |
| return (NULL); |
| break; |
| |
| case 'x': /* The date, using the locale's format. */ |
| _LEGAL_ALT(_ALT_E); |
| if (!(bp = _strptime(bp, _ctloc(d_fmt), tm, cr))) |
| return (NULL); |
| break; |
| |
| /* |
| * "Elementary" conversion rules. |
| */ |
| case 'A': /* The day of week, using the locale's form. */ |
| case 'a': |
| _LEGAL_ALT(0); |
| for (i = 0; i < 7; i++) { |
| /* Full name. */ |
| len = strlen(_ctloc(day[i])); |
| if (strncasecmp(_ctloc(day[i]), (const char*)bp, len) == 0) |
| break; |
| |
| /* Abbreviated name. */ |
| len = strlen(_ctloc(abday[i])); |
| if (strncasecmp(_ctloc(abday[i]), (const char*)bp, len) == 0) |
| break; |
| } |
| |
| /* Nothing matched. */ |
| if (i == 7) |
| return (NULL); |
| |
| tm->tm_wday = i; |
| bp += len; |
| break; |
| |
| case 'B': /* The month, using the locale's form. */ |
| case 'b': |
| case 'h': |
| _LEGAL_ALT(0); |
| for (i = 0; i < 12; i++) { |
| /* Full name. */ |
| len = strlen(_ctloc(mon[i])); |
| if (strncasecmp(_ctloc(mon[i]), (const char*)bp, len) == 0) |
| break; |
| |
| /* Abbreviated name. */ |
| len = strlen(_ctloc(abmon[i])); |
| if (strncasecmp(_ctloc(abmon[i]), (const char*)bp, len) == 0) |
| break; |
| } |
| |
| /* Nothing matched. */ |
| if (i == 12) |
| return (NULL); |
| |
| tm->tm_mon = i; |
| bp += len; |
| break; |
| |
| case 'C': /* The century number. */ |
| _LEGAL_ALT(_ALT_E); |
| if (!(_conv_num(&bp, &i, 0, 99))) |
| return (NULL); |
| |
| cr->century = i * 100; |
| break; |
| |
| case 'd': /* The day of month. */ |
| case 'e': |
| _LEGAL_ALT(_ALT_O); |
| if (!(_conv_num(&bp, &tm->tm_mday, 1, 31))) |
| return (NULL); |
| break; |
| |
| case 'k': /* The hour (24-hour clock representation). */ |
| _LEGAL_ALT(0); |
| /* FALLTHROUGH */ |
| case 'H': |
| _LEGAL_ALT(_ALT_O); |
| if (!(_conv_num(&bp, &tm->tm_hour, 0, 23))) |
| return (NULL); |
| break; |
| |
| case 'l': /* The hour (12-hour clock representation). */ |
| _LEGAL_ALT(0); |
| /* FALLTHROUGH */ |
| case 'I': |
| _LEGAL_ALT(_ALT_O); |
| if (!(_conv_num(&bp, &tm->tm_hour, 1, 12))) |
| return (NULL); |
| break; |
| |
| case 'j': /* The day of year. */ |
| _LEGAL_ALT(0); |
| if (!(_conv_num(&bp, &tm->tm_yday, 1, 366))) |
| return (NULL); |
| tm->tm_yday--; |
| break; |
| |
| case 'M': /* The minute. */ |
| _LEGAL_ALT(_ALT_O); |
| if (!(_conv_num(&bp, &tm->tm_min, 0, 59))) |
| return (NULL); |
| break; |
| |
| case 'm': /* The month. */ |
| _LEGAL_ALT(_ALT_O); |
| if (!(_conv_num(&bp, &tm->tm_mon, 1, 12))) |
| return (NULL); |
| tm->tm_mon--; |
| break; |
| |
| case 'p': /* The locale's equivalent of AM/PM. */ |
| _LEGAL_ALT(0); |
| /* AM? */ |
| len = strlen(_ctloc(am_pm[0])); |
| if (strncasecmp(_ctloc(am_pm[0]), (const char*)bp, len) == 0) { |
| if (tm->tm_hour > 12) /* i.e., 13:00 AM ?! */ |
| return (NULL); |
| else if (tm->tm_hour == 12) |
| tm->tm_hour = 0; |
| |
| bp += len; |
| break; |
| } |
| /* PM? */ |
| len = strlen(_ctloc(am_pm[1])); |
| if (strncasecmp(_ctloc(am_pm[1]), (const char*)bp, len) == 0) { |
| if (tm->tm_hour > 12) /* i.e., 13:00 PM ?! */ |
| return (NULL); |
| else if (tm->tm_hour < 12) |
| tm->tm_hour += 12; |
| |
| bp += len; |
| break; |
| } |
| |
| /* Nothing matched. */ |
| return (NULL); |
| |
| case 'S': /* The seconds. */ |
| _LEGAL_ALT(_ALT_O); |
| if (!(_conv_num(&bp, &tm->tm_sec, 0, 61))) |
| return (NULL); |
| break; |
| |
| case 'U': /* The week of year, beginning on sunday. */ |
| case 'W': /* The week of year, beginning on monday. */ |
| _LEGAL_ALT(_ALT_O); |
| /* |
| * XXX This is bogus, as we can not assume any valid |
| * information present in the tm structure at this |
| * point to calculate a real value, so just check the |
| * range for now. |
| */ |
| if (!(_conv_num(&bp, &i, 0, 53))) |
| return (NULL); |
| break; |
| |
| case 'w': /* The day of week, beginning on sunday. */ |
| _LEGAL_ALT(_ALT_O); |
| if (!(_conv_num(&bp, &tm->tm_wday, 0, 6))) |
| return (NULL); |
| break; |
| |
| case 'Y': /* The year. */ |
| _LEGAL_ALT(_ALT_E); |
| if (!(_conv_num(&bp, &i, 0, 9999))) |
| return (NULL); |
| |
| cr->relyear = -1; |
| tm->tm_year = i - TM_YEAR_BASE; |
| break; |
| |
| case 'y': /* The year within the century (2 digits). */ |
| _LEGAL_ALT(_ALT_E | _ALT_O); |
| if (!(_conv_num(&bp, &cr->relyear, 0, 99))) |
| return (NULL); |
| break; |
| |
| /* |
| * Miscellaneous conversions. |
| */ |
| case 'n': /* Any kind of white-space. */ |
| case 't': |
| _LEGAL_ALT(0); |
| while (isspace(*bp)) |
| bp++; |
| break; |
| |
| |
| default: /* Unknown/unsupported conversion. */ |
| return (NULL); |
| } |
| |
| |
| } |
| |
| /* |
| * We need to evaluate the two digit year spec (%y) |
| * last as we can get a century spec (%C) at any time. |
| */ |
| if (cr->relyear != -1) { |
| if (cr->century == TM_YEAR_BASE) { |
| if (cr->relyear <= 68) |
| tm->tm_year = cr->relyear + 2000 - TM_YEAR_BASE; |
| else |
| tm->tm_year = cr->relyear + 1900 - TM_YEAR_BASE; |
| } else { |
| tm->tm_year = cr->relyear + cr->century - TM_YEAR_BASE; |
| } |
| } |
| |
| return (unsigned char*)bp; |
| } |
| |
| |
| static int |
| _conv_num(const unsigned char **buf, int *dest, int llim, int ulim) |
| { |
| int result = 0; |
| int rulim = ulim; |
| |
| if (**buf < '0' || **buf > '9') |
| return (0); |
| |
| /* we use rulim to break out of the loop when we run out of digits */ |
| do { |
| result *= 10; |
| result += *(*buf)++ - '0'; |
| rulim /= 10; |
| } while ((result * 10 <= ulim) && rulim && **buf >= '0' && **buf <= '9'); |
| |
| if (result < llim || result > ulim) |
| return (0); |
| |
| *dest = result; |
| return (1); |
| } |
