]> Zhao Yanbai Git Server - minix.git/commitdiff
original netbsd strptime
authorBen Gras <ben@minix3.org>
Tue, 22 Jun 2010 21:37:54 +0000 (21:37 +0000)
committerBen Gras <ben@minix3.org>
Tue, 22 Jun 2010 21:37:54 +0000 (21:37 +0000)
lib/libc/stdtime/strptime.c [new file with mode: 0644]

diff --git a/lib/libc/stdtime/strptime.c b/lib/libc/stdtime/strptime.c
new file mode 100644 (file)
index 0000000..6dff8b8
--- /dev/null
@@ -0,0 +1,382 @@
+/*     $NetBSD: strptime.c,v 1.28 2008/04/28 20:23:01 martin Exp $     */
+
+/*-
+ * Copyright (c) 1997, 1998, 2005, 2008 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code was contributed to The NetBSD Foundation by Klaus Klein.
+ * Heavily optimised by David Laight
+ *
+ * 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.
+ *
+ * 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/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: strptime.c,v 1.28 2008/04/28 20:23:01 martin Exp $");
+#endif
+
+#include "namespace.h"
+#include <sys/localedef.h>
+#include <ctype.h>
+#include <locale.h>
+#include <string.h>
+#include <time.h>
+#include <tzfile.h>
+
+#ifdef __weak_alias
+__weak_alias(strptime,_strptime)
+#endif
+
+#define        _ctloc(x)               (_CurrentTimeLocale->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 NULL; }
+
+static const char gmt[4] = { "GMT" };
+
+static const u_char *conv_num(const unsigned char *, int *, uint, uint);
+static const u_char *find_string(const u_char *, int *, const char * const *,
+       const char * const *, int);
+
+
+char *
+strptime(const char *buf, const char *fmt, struct tm *tm)
+{
+       unsigned char c;
+       const unsigned char *bp;
+       int alt_format, i, split_year = 0;
+       const char *new_fmt;
+
+       bp = (const u_char *)buf;
+
+       while (bp != NULL && (c = *fmt++) != '\0') {
+               /* Clear `alternate' modifier prior to new conversion. */
+               alt_format = 0;
+               i = 0;
+
+               /* Eat up white-space. */
+               if (isspace(c)) {
+                       while (isspace(*bp))
+                               bp++;
+                       continue;
+               }
+
+               if (c != '%')
+                       goto literal;
+
+
+again:         switch (c = *fmt++) {
+               case '%':       /* "%%" is converted to "%". */
+literal:
+                       if (c != *bp++)
+                               return NULL;
+                       LEGAL_ALT(0);
+                       continue;
+
+               /*
+                * "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. */
+                       new_fmt = _ctloc(d_t_fmt);
+                       goto recurse;
+
+               case 'D':       /* The date as "%m/%d/%y". */
+                       new_fmt = "%m/%d/%y";
+                       LEGAL_ALT(0);
+                       goto recurse;
+
+               case 'F':       /* The date as "%Y-%m-%d". */
+                       new_fmt = "%Y-%m-%d";
+                       LEGAL_ALT(0);
+                       goto recurse;
+
+               case 'R':       /* The time as "%H:%M". */
+                       new_fmt = "%H:%M";
+                       LEGAL_ALT(0);
+                       goto recurse;
+
+               case 'r':       /* The time in 12-hour clock representation. */
+                       new_fmt =_ctloc(t_fmt_ampm);
+                       LEGAL_ALT(0);
+                       goto recurse;
+
+               case 'T':       /* The time as "%H:%M:%S". */
+                       new_fmt = "%H:%M:%S";
+                       LEGAL_ALT(0);
+                       goto recurse;
+
+               case 'X':       /* The time, using the locale's format. */
+                       new_fmt =_ctloc(t_fmt);
+                       goto recurse;
+
+               case 'x':       /* The date, using the locale's format. */
+                       new_fmt =_ctloc(d_fmt);
+                   recurse:
+                       bp = (const u_char *)strptime((const char *)bp,
+                                                           new_fmt, tm);
+                       LEGAL_ALT(ALT_E);
+                       continue;
+
+               /*
+                * "Elementary" conversion rules.
+                */
+               case 'A':       /* The day of week, using the locale's form. */
+               case 'a':
+                       bp = find_string(bp, &tm->tm_wday, _ctloc(day),
+                                       _ctloc(abday), 7);
+                       LEGAL_ALT(0);
+                       continue;
+
+               case 'B':       /* The month, using the locale's form. */
+               case 'b':
+               case 'h':
+                       bp = find_string(bp, &tm->tm_mon, _ctloc(mon),
+                                       _ctloc(abmon), 12);
+                       LEGAL_ALT(0);
+                       continue;
+
+               case 'C':       /* The century number. */
+                       i = 20;
+                       bp = conv_num(bp, &i, 0, 99);
+
+                       i = i * 100 - TM_YEAR_BASE;
+                       if (split_year)
+                               i += tm->tm_year % 100;
+                       split_year = 1;
+                       tm->tm_year = i;
+                       LEGAL_ALT(ALT_E);
+                       continue;
+
+               case 'd':       /* The day of month. */
+               case 'e':
+                       bp = conv_num(bp, &tm->tm_mday, 1, 31);
+                       LEGAL_ALT(ALT_O);
+                       continue;
+
+               case 'k':       /* The hour (24-hour clock representation). */
+                       LEGAL_ALT(0);
+                       /* FALLTHROUGH */
+               case 'H':
+                       bp = conv_num(bp, &tm->tm_hour, 0, 23);
+                       LEGAL_ALT(ALT_O);
+                       continue;
+
+               case 'l':       /* The hour (12-hour clock representation). */
+                       LEGAL_ALT(0);
+                       /* FALLTHROUGH */
+               case 'I':
+                       bp = conv_num(bp, &tm->tm_hour, 1, 12);
+                       if (tm->tm_hour == 12)
+                               tm->tm_hour = 0;
+                       LEGAL_ALT(ALT_O);
+                       continue;
+
+               case 'j':       /* The day of year. */
+                       i = 1;
+                       bp = conv_num(bp, &i, 1, 366);
+                       tm->tm_yday = i - 1;
+                       LEGAL_ALT(0);
+                       continue;
+
+               case 'M':       /* The minute. */
+                       bp = conv_num(bp, &tm->tm_min, 0, 59);
+                       LEGAL_ALT(ALT_O);
+                       continue;
+
+               case 'm':       /* The month. */
+                       i = 1;
+                       bp = conv_num(bp, &i, 1, 12);
+                       tm->tm_mon = i - 1;
+                       LEGAL_ALT(ALT_O);
+                       continue;
+
+               case 'p':       /* The locale's equivalent of AM/PM. */
+                       bp = find_string(bp, &i, _ctloc(am_pm), NULL, 2);
+                       if (tm->tm_hour > 11)
+                               return NULL;
+                       tm->tm_hour += i * 12;
+                       LEGAL_ALT(0);
+                       continue;
+
+               case 'S':       /* The seconds. */
+                       bp = conv_num(bp, &tm->tm_sec, 0, 61);
+                       LEGAL_ALT(ALT_O);
+                       continue;
+
+               case 'U':       /* The week of year, beginning on sunday. */
+               case 'W':       /* The week of year, beginning on monday. */
+                       /*
+                        * 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.
+                        */
+                        bp = conv_num(bp, &i, 0, 53);
+                        LEGAL_ALT(ALT_O);
+                        continue;
+
+               case 'w':       /* The day of week, beginning on sunday. */
+                       bp = conv_num(bp, &tm->tm_wday, 0, 6);
+                       LEGAL_ALT(ALT_O);
+                       continue;
+
+               case 'Y':       /* The year. */
+                       i = TM_YEAR_BASE;       /* just for data sanity... */
+                       bp = conv_num(bp, &i, 0, 9999);
+                       tm->tm_year = i - TM_YEAR_BASE;
+                       LEGAL_ALT(ALT_E);
+                       continue;
+
+               case 'y':       /* The year within 100 years of the epoch. */
+                       /* LEGAL_ALT(ALT_E | ALT_O); */
+                       bp = conv_num(bp, &i, 0, 99);
+
+                       if (split_year)
+                               /* preserve century */
+                               i += (tm->tm_year / 100) * 100;
+                       else {
+                               split_year = 1;
+                               if (i <= 68)
+                                       i = i + 2000 - TM_YEAR_BASE;
+                               else
+                                       i = i + 1900 - TM_YEAR_BASE;
+                       }
+                       tm->tm_year = i;
+                       continue;
+
+               case 'Z':
+                       tzset();
+                       if (strncmp((const char *)bp, gmt, 3) == 0) {
+                               tm->tm_isdst = 0;
+#ifdef TM_GMTOFF
+                               tm->TM_GMTOFF = 0;
+#endif
+#ifdef TM_ZONE
+                               tm->TM_ZONE = gmt;
+#endif
+                               bp += 3;
+                       } else {
+                               const unsigned char *ep;
+
+                               ep = find_string(bp, &i,
+                                                (const char * const *)tzname,
+                                                 NULL, 2);
+                               if (ep != NULL) {
+                                       tm->tm_isdst = i;
+#ifdef TM_GMTOFF
+                                       tm->TM_GMTOFF = -(timezone);
+#endif
+#ifdef TM_ZONE
+                                       tm->TM_ZONE = tzname[i];
+#endif
+                               }
+                               bp = ep;
+                       }
+                       continue;
+
+               /*
+                * Miscellaneous conversions.
+                */
+               case 'n':       /* Any kind of white-space. */
+               case 't':
+                       while (isspace(*bp))
+                               bp++;
+                       LEGAL_ALT(0);
+                       continue;
+
+
+               default:        /* Unknown/unsupported conversion. */
+                       return NULL;
+               }
+       }
+
+       return __UNCONST(bp);
+}
+
+
+static const u_char *
+conv_num(const unsigned char *buf, int *dest, uint llim, uint ulim)
+{
+       uint result = 0;
+       unsigned char ch;
+
+       /* The limit also determines the number of valid digits. */
+       uint rulim = ulim;
+
+       ch = *buf;
+       if (ch < '0' || ch > '9')
+               return NULL;
+
+       do {
+               result *= 10;
+               result += ch - '0';
+               rulim /= 10;
+               ch = *++buf;
+       } while ((result * 10 <= ulim) && rulim && ch >= '0' && ch <= '9');
+
+       if (result < llim || result > ulim)
+               return NULL;
+
+       *dest = result;
+       return buf;
+}
+
+static const u_char *
+find_string(const u_char *bp, int *tgt, const char * const *n1,
+               const char * const *n2, int c)
+{
+       int i;
+       unsigned int len;
+
+       /* check full name - then abbreviated ones */
+       for (; n1 != NULL; n1 = n2, n2 = NULL) {
+               for (i = 0; i < c; i++, n1++) {
+                       len = strlen(*n1);
+                       if (strncasecmp(*n1, (const char *)bp, len) == 0) {
+                               *tgt = i;
+                               return bp + len;
+                       }
+               }
+       }
+
+       /* Nothing matched */
+       return NULL;
+}