win32: use strptime from gnulib

3 files changed, 649 insertions, 5 deletions

diff --git a/win32/Kbuild b/win32/Kbuild
index 564498c78..c1005bd11 100644
--- a/win32/Kbuild
+++ b/win32/Kbuild
@@ -15,6 +15,7 @@ lib-$(CONFIG_PLATFORM_MINGW32) += poll.o
 lib-$(CONFIG_PLATFORM_MINGW32) += popen.o
 lib-$(CONFIG_PLATFORM_MINGW32) += statfs.o
 lib-$(CONFIG_PLATFORM_MINGW32) += mntent.o
+lib-$(CONFIG_PLATFORM_MINGW32) += strptime.o
 lib-$(CONFIG_PLATFORM_MINGW32) += system.o
 lib-$(CONFIG_PLATFORM_MINGW32) += termios.o
 lib-$(CONFIG_PLATFORM_MINGW32) += uname.o
diff --git a/win32/mingw.c b/win32/mingw.c
index b5b3576eb..810cce604 100644
--- a/win32/mingw.c
+++ b/win32/mingw.c
@@ -799,11 +799,6 @@ int mingw_unlink(const char *pathname)
         return unlink(pathname);
 }
 
-char *strptime(const char *s UNUSED_PARAM, const char *format UNUSED_PARAM, struct tm *tm UNUSED_PARAM)
-{
-        return NULL;
-}
-
 #undef strftime
 size_t mingw_strftime(const char *buf, size_t max, const char *format, const struct tm *tm)
 {
diff --git a/win32/strptime.c b/win32/strptime.c
new file mode 100644
index 000000000..64fd37779
--- /dev/null
+++ b/win32/strptime.c
@@ -0,0 +1,648 @@
+/* Copyright (C) 2002, 2004-2005, 2007, 2009-2014 Free Software Foundation,
+   Inc.
+   This file is part of the GNU C Library.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this program; if not, see <http://www.gnu.org/licenses/>.  */
+
+/*
+ * File from gnulib (http://www.gnu.org/software/gnulib/), processed with
+ *    coan source -U_LIBC -U_NL_CURRENT -UHAVE_TM_GMTOFF strptime.c
+ * and lightly edited.
+ */
+
+#include <time.h>
+
+#include <assert.h>
+#include <ctype.h>
+#include <limits.h>
+#include <string.h>
+#include <stdbool.h>
+
+
+enum ptime_locale_status { not, loc, raw };
+
+
+
+#define match_char(ch1, ch2) if (ch1 != ch2) return NULL
+/* Oh come on.  Get a reasonable compiler.  */
+# define match_string(cs1, s2) \
+  (strncasecmp ((cs1), (s2), strlen (cs1)) ? 0 : ((s2) += strlen (cs1), 1))
+/* We intentionally do not use isdigit() for testing because this will
+   lead to problems with the wide character version.  */
+#define get_number(from, to, n) \
+  do {                                                                        \
+    int __n = n;                                                              \
+    val = 0;                                                                  \
+    while (*rp == ' ')                                                        \
+      ++rp;                                                                   \
+    if (*rp < '0' || *rp > '9')                                               \
+      return NULL;                                                            \
+    do {                                                                      \
+      val *= 10;                                                              \
+      val += *rp++ - '0';                                                     \
+    } while (--__n > 0 && val * 10 <= to && *rp >= '0' && *rp <= '9');        \
+    if (val < from || val > to)                                               \
+      return NULL;                                                            \
+  } while (0)
+# define get_alt_number(from, to, n) \
+  /* We don't have the alternate representation.  */                          \
+  get_number(from, to, n)
+#define recursive(new_fmt) \
+  (*(new_fmt) != '\0'                                                         \
+   && (rp = __strptime_internal (rp, (new_fmt), tm,                           \
+                                 decided, era_cnt LOCALE_ARG)) != NULL)
+
+
+static char const weekday_name[][10] =
+  {
+    "Sunday", "Monday", "Tuesday", "Wednesday",
+    "Thursday", "Friday", "Saturday"
+  };
+static char const ab_weekday_name[][4] =
+  {
+    "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
+  };
+static char const month_name[][10] =
+  {
+    "January", "February", "March", "April", "May", "June",
+    "July", "August", "September", "October", "November", "December"
+  };
+static char const ab_month_name[][4] =
+  {
+    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+  };
+# define HERE_D_T_FMT "%a %b %e %H:%M:%S %Y"
+# define HERE_D_FMT "%m/%d/%y"
+# define HERE_AM_STR "AM"
+# define HERE_PM_STR "PM"
+# define HERE_T_FMT_AMPM "%I:%M:%S %p"
+# define HERE_T_FMT "%H:%M:%S"
+
+static const unsigned short int __mon_yday[2][13] =
+  {
+    /* Normal years.  */
+    { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
+    /* Leap years.  */
+    { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
+  };
+
+# define LOCALE_PARAM
+# define LOCALE_ARG
+# define LOCALE_PARAM_DECL
+# define LOCALE_PARAM_PROTO
+# define HELPER_LOCALE_ARG
+# define ISSPACE(Ch) isspace (Ch)
+
+
+
+
+#ifndef __isleap
+/* Nonzero if YEAR is a leap year (every 4 years,
+   except every 100th isn't, and every 400th is).  */
+# define __isleap(year) \
+  ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
+#endif
+
+/* Compute the day of the week.  */
+static void
+day_of_the_week (struct tm *tm)
+{
+  /* We know that January 1st 1970 was a Thursday (= 4).  Compute the
+     difference between this data in the one on TM and so determine
+     the weekday.  */
+  int corr_year = 1900 + tm->tm_year - (tm->tm_mon < 2);
+  int wday = (-473
+              + (365 * (tm->tm_year - 70))
+              + (corr_year / 4)
+              - ((corr_year / 4) / 25) + ((corr_year / 4) % 25 < 0)
+              + (((corr_year / 4) / 25) / 4)
+              + __mon_yday[0][tm->tm_mon]
+              + tm->tm_mday - 1);
+  tm->tm_wday = ((wday % 7) + 7) % 7;
+}
+
+/* Compute the day of the year.  */
+static void
+day_of_the_year (struct tm *tm)
+{
+  tm->tm_yday = (__mon_yday[__isleap (1900 + tm->tm_year)][tm->tm_mon]
+                 + (tm->tm_mday - 1));
+}
+
+
+static char *
+__strptime_internal (rp, fmt, tm, decided, era_cnt LOCALE_PARAM)
+     const char *rp;
+     const char *fmt;
+     struct tm *tm;
+     enum ptime_locale_status *decided;
+     int era_cnt;
+     LOCALE_PARAM_DECL
+{
+
+  int cnt;
+  size_t val;
+  int have_I, is_pm;
+  int century, want_century;
+  int want_era;
+  int have_wday, want_xday;
+  int have_yday;
+  int have_mon, have_mday;
+  int have_uweek, have_wweek;
+  int week_no;
+
+  have_I = is_pm = 0;
+  century = -1;
+  want_century = 0;
+  want_era = 0;
+  week_no = 0;
+
+  have_wday = want_xday = have_yday = have_mon = have_mday = have_uweek = 0;
+  have_wweek = 0;
+
+  while (*fmt != '\0')
+    {
+      /* A white space in the format string matches 0 more or white
+         space in the input string.  */
+      if (ISSPACE (*fmt))
+        {
+          while (ISSPACE (*rp))
+            ++rp;
+          ++fmt;
+          continue;
+        }
+
+      /* Any character but '%' must be matched by the same character
+         in the iput string.  */
+      if (*fmt != '%')
+        {
+          match_char (*fmt++, *rp++);
+          continue;
+        }
+
+      ++fmt;
+      /* We need this for handling the 'E' modifier.  */
+    start_over:
+
+      switch (*fmt++)
+        {
+        case '%':
+          /* Match the '%' character itself.  */
+          match_char ('%', *rp++);
+          break;
+        case 'a':
+        case 'A':
+          /* Match day of week.  */
+          for (cnt = 0; cnt < 7; ++cnt)
+            {
+              if (*decided != loc
+                  && (match_string (weekday_name[cnt], rp)
+                      || match_string (ab_weekday_name[cnt], rp)))
+                {
+                  *decided = raw;
+                  break;
+                }
+            }
+          if (cnt == 7)
+            /* Does not match a weekday name.  */
+            return NULL;
+          tm->tm_wday = cnt;
+          have_wday = 1;
+          break;
+        case 'b':
+        case 'B':
+        case 'h':
+          /* Match month name.  */
+          for (cnt = 0; cnt < 12; ++cnt)
+            {
+              if (match_string (month_name[cnt], rp)
+                  || match_string (ab_month_name[cnt], rp))
+                {
+                  *decided = raw;
+                  break;
+                }
+            }
+          if (cnt == 12)
+            /* Does not match a month name.  */
+            return NULL;
+          tm->tm_mon = cnt;
+          want_xday = 1;
+          break;
+        case 'c':
+          /* Match locale's date and time format.  */
+          if (!recursive (HERE_D_T_FMT))
+            return NULL;
+          want_xday = 1;
+          break;
+        case 'C':
+          /* Match century number.  */
+          get_number (0, 99, 2);
+          century = val;
+          want_xday = 1;
+          break;
+        case 'd':
+        case 'e':
+          /* Match day of month.  */
+          get_number (1, 31, 2);
+          tm->tm_mday = val;
+          have_mday = 1;
+          want_xday = 1;
+          break;
+        case 'F':
+          if (!recursive ("%Y-%m-%d"))
+            return NULL;
+          want_xday = 1;
+          break;
+        case 'x':
+          /* Fall through.  */
+        case 'D':
+          /* Match standard day format.  */
+          if (!recursive (HERE_D_FMT))
+            return NULL;
+          want_xday = 1;
+          break;
+        case 'k':
+        case 'H':
+          /* Match hour in 24-hour clock.  */
+          get_number (0, 23, 2);
+          tm->tm_hour = val;
+          have_I = 0;
+          break;
+        case 'l':
+          /* Match hour in 12-hour clock.  GNU extension.  */
+        case 'I':
+          /* Match hour in 12-hour clock.  */
+          get_number (1, 12, 2);
+          tm->tm_hour = val % 12;
+          have_I = 1;
+          break;
+        case 'j':
+          /* Match day number of year.  */
+          get_number (1, 366, 3);
+          tm->tm_yday = val - 1;
+          have_yday = 1;
+          break;
+        case 'm':
+          /* Match number of month.  */
+          get_number (1, 12, 2);
+          tm->tm_mon = val - 1;
+          have_mon = 1;
+          want_xday = 1;
+          break;
+        case 'M':
+          /* Match minute.  */
+          get_number (0, 59, 2);
+          tm->tm_min = val;
+          break;
+        case 'n':
+        case 't':
+          /* Match any white space.  */
+          while (ISSPACE (*rp))
+            ++rp;
+          break;
+        case 'p':
+          /* Match locale's equivalent of AM/PM.  */
+          if (!match_string (HERE_AM_STR, rp))
+            {
+              if (match_string (HERE_PM_STR, rp))
+                is_pm = 1;
+              else
+                return NULL;
+            }
+          break;
+        case 'r':
+          if (!recursive (HERE_T_FMT_AMPM))
+            return NULL;
+          break;
+        case 'R':
+          if (!recursive ("%H:%M"))
+            return NULL;
+          break;
+        case 's':
+          {
+            /* The number of seconds may be very high so we cannot use
+               the 'get_number' macro.  Instead read the number
+               character for character and construct the result while
+               doing this.  */
+            time_t secs = 0;
+            struct tm *mytm;
+            if (*rp < '0' || *rp > '9')
+              /* We need at least one digit.  */
+              return NULL;
+
+            do
+              {
+                secs *= 10;
+                secs += *rp++ - '0';
+              }
+            while (*rp >= '0' && *rp <= '9');
+
+            if ((mytm=localtime(&secs)) == NULL)
+              /* Error in function.  */
+              return NULL;
+            *tm = *mytm;
+          }
+          break;
+        case 'S':
+          get_number (0, 61, 2);
+          tm->tm_sec = val;
+          break;
+        case 'X':
+          /* Fall through.  */
+        case 'T':
+          if (!recursive (HERE_T_FMT))
+            return NULL;
+          break;
+        case 'u':
+          get_number (1, 7, 1);
+          tm->tm_wday = val % 7;
+          have_wday = 1;
+          break;
+        case 'g':
+          get_number (0, 99, 2);
+          /* XXX This cannot determine any field in TM.  */
+          break;
+        case 'G':
+          if (*rp < '0' || *rp > '9')
+            return NULL;
+          /* XXX Ignore the number since we would need some more
+             information to compute a real date.  */
+          do
+            ++rp;
+          while (*rp >= '0' && *rp <= '9');
+          break;
+        case 'U':
+          get_number (0, 53, 2);
+          week_no = val;
+          have_uweek = 1;
+          break;
+        case 'W':
+          get_number (0, 53, 2);
+          week_no = val;
+          have_wweek = 1;
+          break;
+        case 'V':
+          get_number (0, 53, 2);
+          /* XXX This cannot determine any field in TM without some
+             information.  */
+          break;
+        case 'w':
+          /* Match number of weekday.  */
+          get_number (0, 6, 1);
+          tm->tm_wday = val;
+          have_wday = 1;
+          break;
+        case 'y':
+          /* Match year within century.  */
+          get_number (0, 99, 2);
+          /* The "Year 2000: The Millennium Rollover" paper suggests that
+             values in the range 69-99 refer to the twentieth century.  */
+          tm->tm_year = val >= 69 ? val : val + 100;
+          /* Indicate that we want to use the century, if specified.  */
+          want_century = 1;
+          want_xday = 1;
+          break;
+        case 'Y':
+          /* Match year including century number.  */
+          get_number (0, 9999, 4);
+          tm->tm_year = val - 1900;
+          want_century = 0;
+          want_xday = 1;
+          break;
+        case 'Z':
+          /* XXX How to handle this?  */
+          break;
+        case 'z':
+          /* We recognize two formats: if two digits are given, these
+             specify hours.  If fours digits are used, minutes are
+             also specified.  */
+          {
+            bool neg;
+            int n;
+
+            val = 0;
+            while (*rp == ' ')
+              ++rp;
+            if (*rp != '+' && *rp != '-')
+              return NULL;
+            neg = *rp++ == '-';
+            n = 0;
+            while (n < 4 && *rp >= '0' && *rp <= '9')
+              {
+                val = val * 10 + *rp++ - '0';
+                ++n;
+              }
+            if (n == 2)
+              val *= 100;
+            else if (n != 4)
+              /* Only two or four digits recognized.  */
+              return NULL;
+            else
+              {
+                /* We have to convert the minutes into decimal.  */
+                if (val % 100 >= 60)
+                  return NULL;
+                val = (val / 100) * 100 + ((val % 100) * 50) / 30;
+              }
+            if (val > 1200)
+              return NULL;
+          }
+          break;
+        case 'E':
+          /* We have no information about the era format.  Just use
+             the normal format.  */
+          if (*fmt != 'c' && *fmt != 'C' && *fmt != 'y' && *fmt != 'Y'
+              && *fmt != 'x' && *fmt != 'X')
+            /* This is an illegal format.  */
+            return NULL;
+
+          goto start_over;
+        case 'O':
+          switch (*fmt++)
+            {
+            case 'd':
+            case 'e':
+              /* Match day of month using alternate numeric symbols.  */
+              get_alt_number (1, 31, 2);
+              tm->tm_mday = val;
+              have_mday = 1;
+              want_xday = 1;
+              break;
+            case 'H':
+              /* Match hour in 24-hour clock using alternate numeric
+                 symbols.  */
+              get_alt_number (0, 23, 2);
+              tm->tm_hour = val;
+              have_I = 0;
+              break;
+            case 'I':
+              /* Match hour in 12-hour clock using alternate numeric
+                 symbols.  */
+              get_alt_number (1, 12, 2);
+              tm->tm_hour = val % 12;
+              have_I = 1;
+              break;
+            case 'm':
+              /* Match month using alternate numeric symbols.  */
+              get_alt_number (1, 12, 2);
+              tm->tm_mon = val - 1;
+              have_mon = 1;
+              want_xday = 1;
+              break;
+            case 'M':
+              /* Match minutes using alternate numeric symbols.  */
+              get_alt_number (0, 59, 2);
+              tm->tm_min = val;
+              break;
+            case 'S':
+              /* Match seconds using alternate numeric symbols.  */
+              get_alt_number (0, 61, 2);
+              tm->tm_sec = val;
+              break;
+            case 'U':
+              get_alt_number (0, 53, 2);
+              week_no = val;
+              have_uweek = 1;
+              break;
+            case 'W':
+              get_alt_number (0, 53, 2);
+              week_no = val;
+              have_wweek = 1;
+              break;
+            case 'V':
+              get_alt_number (0, 53, 2);
+              /* XXX This cannot determine any field in TM without
+                 further information.  */
+              break;
+            case 'w':
+              /* Match number of weekday using alternate numeric symbols.  */
+              get_alt_number (0, 6, 1);
+              tm->tm_wday = val;
+              have_wday = 1;
+              break;
+            case 'y':
+              /* Match year within century using alternate numeric symbols.  */
+              get_alt_number (0, 99, 2);
+              tm->tm_year = val >= 69 ? val : val + 100;
+              want_xday = 1;
+              break;
+            default:
+              return NULL;
+            }
+          break;
+        default:
+          return NULL;
+        }
+    }
+
+  if (have_I && is_pm)
+    tm->tm_hour += 12;
+
+  if (century != -1)
+    {
+      if (want_century)
+        tm->tm_year = tm->tm_year % 100 + (century - 19) * 100;
+      else
+        /* Only the century, but not the year.  Strange, but so be it.  */
+        tm->tm_year = (century - 19) * 100;
+    }
+
+  if (era_cnt != -1)
+    {
+    }
+  else
+    if (want_era)
+      {
+        /* No era found but we have seen an E modifier.  Rectify some
+           values.  */
+        if (want_century && century == -1 && tm->tm_year < 69)
+          tm->tm_year += 100;
+      }
+
+  if (want_xday && !have_wday)
+    {
+      if ( !(have_mon && have_mday) && have_yday)
+        {
+          /* We don't have tm_mon and/or tm_mday, compute them.  */
+          int t_mon = 0;
+          while (__mon_yday[__isleap(1900 + tm->tm_year)][t_mon] <= tm->tm_yday)
+              t_mon++;
+          if (!have_mon)
+              tm->tm_mon = t_mon - 1;
+          if (!have_mday)
+              tm->tm_mday =
+                (tm->tm_yday
+                 - __mon_yday[__isleap(1900 + tm->tm_year)][t_mon - 1] + 1);
+        }
+      day_of_the_week (tm);
+    }
+
+  if (want_xday && !have_yday)
+    day_of_the_year (tm);
+
+  if ((have_uweek || have_wweek) && have_wday)
+    {
+      int save_wday = tm->tm_wday;
+      int save_mday = tm->tm_mday;
+      int save_mon = tm->tm_mon;
+      int w_offset = have_uweek ? 0 : 1;
+
+      tm->tm_mday = 1;
+      tm->tm_mon = 0;
+      day_of_the_week (tm);
+      if (have_mday)
+        tm->tm_mday = save_mday;
+      if (have_mon)
+        tm->tm_mon = save_mon;
+
+      if (!have_yday)
+        tm->tm_yday = ((7 - (tm->tm_wday - w_offset)) % 7
+                       + (week_no - 1) *7
+                       + save_wday - w_offset);
+
+      if (!have_mday || !have_mon)
+        {
+          int t_mon = 0;
+          while (__mon_yday[__isleap(1900 + tm->tm_year)][t_mon]
+                 <= tm->tm_yday)
+            t_mon++;
+          if (!have_mon)
+            tm->tm_mon = t_mon - 1;
+          if (!have_mday)
+              tm->tm_mday =
+                (tm->tm_yday
+                 - __mon_yday[__isleap(1900 + tm->tm_year)][t_mon - 1] + 1);
+        }
+
+      tm->tm_wday = save_wday;
+    }
+
+  return (char *) rp;
+}
+
+
+char *
+strptime (buf, format, tm LOCALE_PARAM)
+     const char *buf;
+     const char *format;
+     struct tm *tm;
+     LOCALE_PARAM_DECL
+{
+  enum ptime_locale_status decided;
+
+  decided = raw;
+  return __strptime_internal (buf, format, tm, &decided, -1 LOCALE_ARG);
+}
+