/* $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 #include #include #include #include #include #include #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 'F': /* The date as "%Y-%m-%d". */ _LEGAL_ALT(0); if (!(bp = _strptime(bp, "%Y-%m-%d", tm, cr))) return (NULL); continue; 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 'v': /* The date as "%e-%b-%Y". */ _LEGAL_ALT(0); if (!(bp = _strptime(bp, "%e-%b-%Y", 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': 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 's': { // Android addition, based on FreeBSD's implementation. int saved_errno = errno; errno = 0; const unsigned char* old_bp = bp; long n = strtol((const char*) bp, (char**) &bp, 10); time_t t = n; if (bp == old_bp || errno == ERANGE || ((long) t) != n) { errno = saved_errno; return NULL; } errno = saved_errno; if (localtime_r(&t, tm) == NULL) 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 'u': /* The day of week, monday = 1. */ _LEGAL_ALT(_ALT_O); if (!(_conv_num(&bp, &i, 1, 7))) return (NULL); tm->tm_wday = i % 7; continue; case 'g': /* The year corresponding to the ISO week * number but without the century. */ if (!(_conv_num(&bp, &i, 0, 99))) return (NULL); continue; case 'G': /* The year corresponding to the ISO week * number with century. */ do bp++; while (isdigit(*bp)); continue; case 'V': /* The ISO 8601:1988 week number as decimal */ if (!(_conv_num(&bp, &i, 0, 53))) return (NULL); continue; 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); } char* strptime_l(const char* buf, const char* fmt, struct tm* tm, locale_t l) { return strptime(buf, fmt, tm); }