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/* NOTE:  This file defines both strftime() and wcsftime().  Take care when
 * making changes.  See also wcsftime.c, and note the (small) overlap in the
 * manual description, taking care to edit both as needed.  */
/*
 * strftime.c
 * Original Author:     G. Haley
 * Additions from:      Eric Blake
 * Changes to allow dual use as wcstime, also:  Craig Howland
 *
 * Places characters into the array pointed to by s as controlled by the string
 * pointed to by format. If the total number of resulting characters including
 * the terminating null character is not more than maxsize, returns the number
 * of characters placed into the array pointed to by s (not including the
 * terminating null character); otherwise zero is returned and the contents of
 * the array indeterminate.
 */
 
/*
FUNCTION
<<strftime>>---convert date and time to a formatted string
 
INDEX
        strftime
 
ANSI_SYNOPSIS
        #include <time.h>
        size_t strftime(char *<[s]>, size_t <[maxsize]>,
                        const char *<[format]>, const struct tm *<[timp]>);
 
TRAD_SYNOPSIS
        #include <time.h>
        size_t strftime(<[s]>, <[maxsize]>, <[format]>, <[timp]>)
        char *<[s]>;
        size_t <[maxsize]>;
        char *<[format]>;
        struct tm *<[timp]>;
 
DESCRIPTION
<<strftime>> converts a <<struct tm>> representation of the time (at
<[timp]>) into a null-terminated string, starting at <[s]> and occupying
no more than <[maxsize]> characters.
 
You control the format of the output using the string at <[format]>.
<<*<[format]>>> can contain two kinds of specifications: text to be
copied literally into the formatted string, and time conversion
specifications.  Time conversion specifications are two- and
three-character sequences beginning with `<<%>>' (use `<<%%>>' to
include a percent sign in the output).  Each defined conversion
specification selects only the specified field(s) of calendar time
data from <<*<[timp]>>>, and converts it to a string in one of the
following ways:
 
o+
o %a
A three-letter abbreviation for the day of the week. [tm_wday]
 
o %A
The full name for the day of the week, one of `<<Sunday>>',
`<<Monday>>', `<<Tuesday>>', `<<Wednesday>>', `<<Thursday>>',
`<<Friday>>', or `<<Saturday>>'. [tm_wday]
 
o %b
A three-letter abbreviation for the month name. [tm_mon]
 
o %B
The full name of the month, one of `<<January>>', `<<February>>',
`<<March>>', `<<April>>', `<<May>>', `<<June>>', `<<July>>',
`<<August>>', `<<September>>', `<<October>>', `<<November>>',
`<<December>>'. [tm_mon]
 
o %c
A string representing the complete date and time, in the form
`<<"%a %b %e %H:%M:%S %Y">>' (example "Mon Apr 01 13:13:13
1992"). [tm_sec, tm_min, tm_hour, tm_mday, tm_mon, tm_year, tm_wday]
 
o %C
The century, that is, the year divided by 100 then truncated.  For
4-digit years, the result is zero-padded and exactly two characters;
but for other years, there may a negative sign or more digits.  In
this way, `<<%C%y>>' is equivalent to `<<%Y>>'. [tm_year]
 
o %d
The day of the month, formatted with two digits (from `<<01>>' to
`<<31>>'). [tm_mday]
 
o %D
A string representing the date, in the form `<<"%m/%d/%y">>'.
[tm_mday, tm_mon, tm_year]
 
o %e
The day of the month, formatted with leading space if single digit
(from `<<1>>' to `<<31>>'). [tm_mday]
 
o %E<<x>>
In some locales, the E modifier selects alternative representations of
certain modifiers <<x>>.  But in the "C" locale supported by newlib,
it is ignored, and treated as %<<x>>.
 
o %F
A string representing the ISO 8601:2000 date format, in the form
`<<"%Y-%m-%d">>'. [tm_mday, tm_mon, tm_year]
 
o %g
The last two digits of the week-based year, see specifier %G (from
`<<00>>' to `<<99>>'). [tm_year, tm_wday, tm_yday]
 
o %G
The week-based year. In the ISO 8601:2000 calendar, week 1 of the year
includes January 4th, and begin on Mondays. Therefore, if January 1st,
2nd, or 3rd falls on a Sunday, that day and earlier belong to the last
week of the previous year; and if December 29th, 30th, or 31st falls
on Monday, that day and later belong to week 1 of the next year.  For
consistency with %Y, it always has at least four characters.
Example: "%G" for Saturday 2nd January 1999 gives "1998", and for
Tuesday 30th December 1997 gives "1998". [tm_year, tm_wday, tm_yday]
 
o %h
A three-letter abbreviation for the month name (synonym for
"%b"). [tm_mon]
 
o %H
The hour (on a 24-hour clock), formatted with two digits (from
`<<00>>' to `<<23>>'). [tm_hour]
 
o %I
The hour (on a 12-hour clock), formatted with two digits (from
`<<01>>' to `<<12>>'). [tm_hour]
 
o %j
The count of days in the year, formatted with three digits
(from `<<001>>' to `<<366>>'). [tm_yday]
 
o %k
The hour (on a 24-hour clock), formatted with leading space if single
digit (from `<<0>>' to `<<23>>'). Non-POSIX extension (c.p. %I). [tm_hour]
 
o %l
The hour (on a 12-hour clock), formatted with leading space if single
digit (from `<<1>>' to `<<12>>'). Non-POSIX extension (c.p. %H). [tm_hour]
 
o %m
The month number, formatted with two digits (from `<<01>>' to `<<12>>').
[tm_mon]
 
o %M
The minute, formatted with two digits (from `<<00>>' to `<<59>>'). [tm_min]
 
o %n
A newline character (`<<\n>>').
 
o %O<<x>>
In some locales, the O modifier selects alternative digit characters
for certain modifiers <<x>>.  But in the "C" locale supported by newlib, it
is ignored, and treated as %<<x>>.
 
o %p
Either `<<AM>>' or `<<PM>>' as appropriate. [tm_hour]
 
o %r
The 12-hour time, to the second.  Equivalent to "%I:%M:%S %p". [tm_sec,
tm_min, tm_hour]
 
o %R
The 24-hour time, to the minute.  Equivalent to "%H:%M". [tm_min, tm_hour]
 
o %S
The second, formatted with two digits (from `<<00>>' to `<<60>>').  The
value 60 accounts for the occasional leap second. [tm_sec]
 
o %t
A tab character (`<<\t>>').
 
o %T
The 24-hour time, to the second.  Equivalent to "%H:%M:%S". [tm_sec,
tm_min, tm_hour]
 
o %u
The weekday as a number, 1-based from Monday (from `<<1>>' to
`<<7>>'). [tm_wday]
 
o %U
The week number, where weeks start on Sunday, week 1 contains the first
Sunday in a year, and earlier days are in week 0.  Formatted with two
digits (from `<<00>>' to `<<53>>').  See also <<%W>>. [tm_wday, tm_yday]
 
o %V
The week number, where weeks start on Monday, week 1 contains January 4th,
and earlier days are in the previous year.  Formatted with two digits
(from `<<01>>' to `<<53>>').  See also <<%G>>. [tm_year, tm_wday, tm_yday]
 
o %w
The weekday as a number, 0-based from Sunday (from `<<0>>' to `<<6>>').
[tm_wday]
 
o %W
The week number, where weeks start on Monday, week 1 contains the first
Monday in a year, and earlier days are in week 0.  Formatted with two
digits (from `<<00>>' to `<<53>>'). [tm_wday, tm_yday]
 
o %x
A string representing the complete date, equivalent to "%m/%d/%y".
[tm_mon, tm_mday, tm_year]
 
o %X
A string representing the full time of day (hours, minutes, and
seconds), equivalent to "%H:%M:%S". [tm_sec, tm_min, tm_hour]
 
o %y
The last two digits of the year (from `<<00>>' to `<<99>>'). [tm_year]
(Implementation interpretation:  always positive, even for negative years.)
 
o %Y
The full year, equivalent to <<%C%y>>.  It will always have at least four
characters, but may have more.  The year is accurate even when tm_year
added to the offset of 1900 overflows an int. [tm_year]
 
o %z
The offset from UTC.  The format consists of a sign (negative is west of
Greewich), two characters for hour, then two characters for minutes
(-hhmm or +hhmm).  If tm_isdst is negative, the offset is unknown and no
output is generated; if it is zero, the offset is the standard offset for
the current time zone; and if it is positive, the offset is the daylight
savings offset for the current timezone. The offset is determined from
the TZ environment variable, as if by calling tzset(). [tm_isdst]
 
o %Z
The time zone name.  If tm_isdst is negative, no output is generated.
Otherwise, the time zone name is based on the TZ environment variable,
as if by calling tzset(). [tm_isdst]
 
o %%
A single character, `<<%>>'.
o-
 
RETURNS
When the formatted time takes up no more than <[maxsize]> characters,
the result is the length of the formatted string.  Otherwise, if the
formatting operation was abandoned due to lack of room, the result is
<<0>>, and the string starting at <[s]> corresponds to just those
parts of <<*<[format]>>> that could be completely filled in within the
<[maxsize]> limit.
 
PORTABILITY
ANSI C requires <<strftime>>, but does not specify the contents of
<<*<[s]>>> when the formatted string would require more than
<[maxsize]> characters.  Unrecognized specifiers and fields of
<<timp>> that are out of range cause undefined results.  Since some
formats expand to 0 bytes, it is wise to set <<*<[s]>>> to a nonzero
value beforehand to distinguish between failure and an empty string.
This implementation does not support <<s>> being NULL, nor overlapping
<<s>> and <<format>>.
 
<<strftime>> requires no supporting OS subroutines.
 
BUGS
<<strftime>> ignores the LC_TIME category of the current locale, hard-coding
the "C" locale settings.
*/
 
#include <stddef.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include "local.h"
 
/* Defines to make the file dual use for either strftime() or wcsftime().
 * To get wcsftime, define MAKE_WCSFTIME.
 * To get strftime, do not define MAKE_WCSFTIME.
 * Names are kept friendly to strftime() usage.  The biggest ugliness is the
 * use of the CQ() macro to make either regular character constants and
 * string literals or wide-character constants and wide-character-string
 * literals, as appropriate.  */
#if !defined(MAKE_WCSFTIME)
#  define CHAR          char            /* string type basis */
#  define CQ(a)         a               /* character constant qualifier */
#  define SFLG                          /* %s flag (null for normal char) */
# else
#  define strftime      wcsftime        /* Alternate function name */
#  define CHAR          wchar_t         /* string type basis */
#  define CQ(a)         L##a            /* character constant qualifier */
#  define snprintf      swprintf        /* wide-char equivalent function name */
#  define strncmp       wcsncmp         /* wide-char equivalent function name */
#  define SFLG          "l"             /* %s flag (l for wide char) */
#endif  /* MAKE_WCSFTIME */
 
/* Enforce the coding assumptions that YEAR_BASE is positive.  (%C, %Y, etc.) */
#if YEAR_BASE < 0
#  error "YEAR_BASE < 0"
#endif
 
static _CONST int dname_len[7] =
{6, 6, 7, 9, 8, 6, 8};
 
static _CONST CHAR *_CONST dname[7] =
{CQ("Sunday"), CQ("Monday"), CQ("Tuesday"), CQ("Wednesday"),
 CQ("Thursday"), CQ("Friday"), CQ("Saturday")};
 
static _CONST int mname_len[12] =
{7, 8, 5, 5, 3, 4, 4, 6, 9, 7, 8, 8};
 
static _CONST CHAR *_CONST mname[12] =
{CQ("January"), CQ("February"), CQ("March"), CQ("April"),
 CQ("May"), CQ("June"), CQ("July"), CQ("August"),
 CQ("September"), CQ("October"), CQ("November"), CQ("December")};
 
/* Using the tm_year, tm_wday, and tm_yday components of TIM_P, return
   -1, 0, or 1 as the adjustment to add to the year for the ISO week
   numbering used in "%g%G%V", avoiding overflow.  */
static int
_DEFUN (iso_year_adjust, (tim_p),
        _CONST struct tm *tim_p)
{
  /* Account for fact that tm_year==0 is year 1900.  */
  int leap = isleap (tim_p->tm_year + (YEAR_BASE
                                       - (tim_p->tm_year < 0 ? 0 : 2000)));
 
  /* Pack the yday, wday, and leap year into a single int since there are so
     many disparate cases.  */
#define PACK(yd, wd, lp) (((yd) << 4) + (wd << 1) + (lp))
  switch (PACK (tim_p->tm_yday, tim_p->tm_wday, leap))
    {
    case PACK (0, 5, 0): /* Jan 1 is Fri, not leap.  */
    case PACK (0, 6, 0): /* Jan 1 is Sat, not leap.  */
    case PACK (0, 0, 0): /* Jan 1 is Sun, not leap.  */
    case PACK (0, 5, 1): /* Jan 1 is Fri, leap year.  */
    case PACK (0, 6, 1): /* Jan 1 is Sat, leap year.  */
    case PACK (0, 0, 1): /* Jan 1 is Sun, leap year.  */
    case PACK (1, 6, 0): /* Jan 2 is Sat, not leap.  */
    case PACK (1, 0, 0): /* Jan 2 is Sun, not leap.  */
    case PACK (1, 6, 1): /* Jan 2 is Sat, leap year.  */
    case PACK (1, 0, 1): /* Jan 2 is Sun, leap year.  */
    case PACK (2, 0, 0): /* Jan 3 is Sun, not leap.  */
    case PACK (2, 0, 1): /* Jan 3 is Sun, leap year.  */
      return -1; /* Belongs to last week of previous year.  */
    case PACK (362, 1, 0): /* Dec 29 is Mon, not leap.  */
    case PACK (363, 1, 1): /* Dec 29 is Mon, leap year.  */
    case PACK (363, 1, 0): /* Dec 30 is Mon, not leap.  */
    case PACK (363, 2, 0): /* Dec 30 is Tue, not leap.  */
    case PACK (364, 1, 1): /* Dec 30 is Mon, leap year.  */
    case PACK (364, 2, 1): /* Dec 30 is Tue, leap year.  */
    case PACK (364, 1, 0): /* Dec 31 is Mon, not leap.  */
    case PACK (364, 2, 0): /* Dec 31 is Tue, not leap.  */
    case PACK (364, 3, 0): /* Dec 31 is Wed, not leap.  */
    case PACK (365, 1, 1): /* Dec 31 is Mon, leap year.  */
    case PACK (365, 2, 1): /* Dec 31 is Tue, leap year.  */
    case PACK (365, 3, 1): /* Dec 31 is Wed, leap year.  */
      return 1; /* Belongs to first week of next year.  */
    }
  return 0; /* Belongs to specified year.  */
#undef PACK
}
 
size_t
_DEFUN (strftime, (s, maxsize, format, tim_p),
        CHAR *s _AND
        size_t maxsize _AND
        _CONST CHAR *format _AND
        _CONST struct tm *tim_p)
{
  size_t count = 0;
  int i, len;
 
  for (;;)
    {
      while (*format && *format != CQ('%'))
        {
          if (count < maxsize - 1)
            s[count++] = *format++;
          else
            return 0;
        }
 
      if (*format == CQ('\0'))
        break;
 
      format++;
      if (*format == CQ('E') || *format == CQ('O'))
        format++;
 
      switch (*format)
        {
        case CQ('a'):
          for (i = 0; i < 3; i++)
            {
              if (count < maxsize - 1)
                s[count++] =
                  dname[tim_p->tm_wday][i];
              else
                return 0;
            }
          break;
        case CQ('A'):
          for (i = 0; i < dname_len[tim_p->tm_wday]; i++)
            {
              if (count < maxsize - 1)
                s[count++] =
                  dname[tim_p->tm_wday][i];
              else
                return 0;
            }
          break;
        case CQ('b'):
        case CQ('h'):
          for (i = 0; i < 3; i++)
            {
              if (count < maxsize - 1)
                s[count++] =
                  mname[tim_p->tm_mon][i];
              else
                return 0;
            }
          break;
        case CQ('B'):
          for (i = 0; i < mname_len[tim_p->tm_mon]; i++)
            {
              if (count < maxsize - 1)
                s[count++] =
                  mname[tim_p->tm_mon][i];
              else
                return 0;
            }
          break;
        case CQ('c'):
          {
            /* Recurse to avoid need to replicate %Y formation. */
            size_t adjust = strftime (&s[count], maxsize - count,
                                      CQ("%a %b %e %H:%M:%S %Y"), tim_p);
            if (adjust > 0)
              count += adjust;
            else
              return 0;
          }
          break;
        case CQ('C'):
          {
            /* Examples of (tm_year + YEAR_BASE) that show how %Y == %C%y
               with 32-bit int.
               %Y               %C              %y
               2147485547       21474855        47
               10000            100             00
               9999             99              99
               0999             09              99
               0099             00              99
               0001             00              01
               0000             00              00
               -001             -0              01
               -099             -0              99
               -999             -9              99
               -1000            -10             00
               -10000           -100            00
               -2147481748      -21474817       48
 
               Be careful of both overflow and sign adjustment due to the
               asymmetric range of years.
            */
            int neg = tim_p->tm_year < -YEAR_BASE;
            int century = tim_p->tm_year >= 0
              ? tim_p->tm_year / 100 + YEAR_BASE / 100
              : abs (tim_p->tm_year + YEAR_BASE) / 100;
            len = snprintf (&s[count], maxsize - count, CQ("%s%.*d"),
                               neg ? CQ("-") : CQ(""), 2 - neg, century);
            if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          }
          break;
        case CQ('d'):
        case CQ('e'):
          len = snprintf (&s[count], maxsize - count,
                        *format == CQ('d') ? CQ("%.2d") : CQ("%2d"),
                        tim_p->tm_mday);
          if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          break;
        case CQ('D'):
        case CQ('x'):
          /* %m/%d/%y */
          len = snprintf (&s[count], maxsize - count,
                        CQ("%.2d/%.2d/%.2d"),
                        tim_p->tm_mon + 1, tim_p->tm_mday,
                        tim_p->tm_year >= 0 ? tim_p->tm_year % 100
                        : abs (tim_p->tm_year + YEAR_BASE) % 100);
          if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          break;
        case CQ('F'):
          { /* %F is equivalent to "%Y-%m-%d" */
            /* Recurse to avoid need to replicate %Y formation. */
            size_t adjust = strftime (&s[count], maxsize - count,
                                      CQ("%Y-%m-%d"), tim_p);
            if (adjust > 0)
              count += adjust;
            else
              return 0;
          }
          break;
        case CQ('g'):
          /* Be careful of both overflow and negative years, thanks to
                 the asymmetric range of years.  */
          {
            int adjust = iso_year_adjust (tim_p);
            int year = tim_p->tm_year >= 0 ? tim_p->tm_year % 100
                : abs (tim_p->tm_year + YEAR_BASE) % 100;
            if (adjust < 0 && tim_p->tm_year <= -YEAR_BASE)
                adjust = 1;
            else if (adjust > 0 && tim_p->tm_year < -YEAR_BASE)
                adjust = -1;
            len = snprintf (&s[count], maxsize - count, CQ("%.2d"),
                       ((year + adjust) % 100 + 100) % 100);
            if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          }
          break;
        case CQ('G'):
          {
            /* See the comments for 'C' and 'Y'; this is a variable length
               field.  Although there is no requirement for a minimum number
               of digits, we use 4 for consistency with 'Y'.  */
            int neg = tim_p->tm_year < -YEAR_BASE;
            int adjust = iso_year_adjust (tim_p);
            int century = tim_p->tm_year >= 0
              ? tim_p->tm_year / 100 + YEAR_BASE / 100
              : abs (tim_p->tm_year + YEAR_BASE) / 100;
            int year = tim_p->tm_year >= 0 ? tim_p->tm_year % 100
              : abs (tim_p->tm_year + YEAR_BASE) % 100;
            if (adjust < 0 && tim_p->tm_year <= -YEAR_BASE)
              neg = adjust = 1;
            else if (adjust > 0 && neg)
              adjust = -1;
            year += adjust;
            if (year == -1)
              {
                year = 99;
                --century;
              }
            else if (year == 100)
              {
                year = 0;
                ++century;
              }
            len = snprintf (&s[count], maxsize - count, CQ("%s%.*d%.2d"),
                               neg ? CQ("-") : CQ(""), 2 - neg, century, year);
            if (len < 0  ||  (count+=len) >= maxsize)
              return 0;
          }
          break;
        case CQ('H'):
        case CQ('k'):   /* newlib extension */
          len = snprintf (&s[count], maxsize - count,
                        *format == CQ('k') ? CQ("%2d") : CQ("%.2d"),
                        tim_p->tm_hour);
          if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          break;
        case CQ('I'):
        case CQ('l'):   /* newlib extension */
          {
            register int  h12;
            h12 = (tim_p->tm_hour == 0 || tim_p->tm_hour == 12)  ?
                                                12  :  tim_p->tm_hour % 12;
            len = snprintf (&s[count], maxsize - count,
                        *format == CQ('I') ? CQ("%.2d") : CQ("%2d"),
                        h12);
            if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          }
          break;
        case CQ('j'):
          len = snprintf (&s[count], maxsize - count, CQ("%.3d"),
                        tim_p->tm_yday + 1);
          if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          break;
        case CQ('m'):
          len = snprintf (&s[count], maxsize - count, CQ("%.2d"),
                        tim_p->tm_mon + 1);
          if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          break;
        case CQ('M'):
          len = snprintf (&s[count], maxsize - count, CQ("%.2d"),
                        tim_p->tm_min);
          if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          break;
        case CQ('n'):
          if (count < maxsize - 1)
            s[count++] = CQ('\n');
          else
            return 0;
          break;
        case CQ('p'):
          if (count < maxsize - 1)
            {
              if (tim_p->tm_hour < 12)
                s[count++] = CQ('A');
              else
                s[count++] = CQ('P');
            }
          if (count < maxsize - 1)
            {
              s[count++] = CQ('M');
            }
          else
            return 0;
          break;
        case CQ('r'):
          {
            register int  h12;
            h12 = (tim_p->tm_hour == 0 || tim_p->tm_hour == 12)  ?
                                                12  :  tim_p->tm_hour % 12;
            len = snprintf (&s[count], maxsize - count,
                        CQ("%.2d:%.2d:%.2d %cM"),
                        h12,
                        tim_p->tm_min,
                        tim_p->tm_sec,
                        (tim_p->tm_hour < 12)  ?  CQ('A') :  CQ('P'));
            if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          }
          break;
        case CQ('R'):
          len = snprintf (&s[count], maxsize - count, CQ("%.2d:%.2d"),
                        tim_p->tm_hour, tim_p->tm_min);
          if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          break;
        case CQ('S'):
          len = snprintf (&s[count], maxsize - count, CQ("%.2d"),
                        tim_p->tm_sec);
          if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          break;
        case CQ('t'):
          if (count < maxsize - 1)
            s[count++] = CQ('\t');
          else
            return 0;
          break;
        case CQ('T'):
        case CQ('X'):
          len = snprintf (&s[count], maxsize - count, CQ("%.2d:%.2d:%.2d"),
                        tim_p->tm_hour, tim_p->tm_min, tim_p->tm_sec);
          if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          break;
        case CQ('u'):
          if (count < maxsize - 1)
            {
              if (tim_p->tm_wday == 0)
                s[count++] = CQ('7');
              else
                s[count++] = CQ('0') + tim_p->tm_wday;
            }
          else
            return 0;
          break;
        case CQ('U'):
          len = snprintf (&s[count], maxsize - count, CQ("%.2d"),
                       (tim_p->tm_yday + 7 -
                        tim_p->tm_wday) / 7);
          if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          break;
        case CQ('V'):
          {
            int adjust = iso_year_adjust (tim_p);
            int wday = (tim_p->tm_wday) ? tim_p->tm_wday - 1 : 6;
            int week = (tim_p->tm_yday + 10 - wday) / 7;
            if (adjust > 0)
                week = 1;
            else if (adjust < 0)
                /* Previous year has 53 weeks if current year starts on
                   Fri, and also if current year starts on Sat and
                   previous year was leap year.  */
                week = 52 + (4 >= (wday - tim_p->tm_yday
                                   - isleap (tim_p->tm_year
                                             + (YEAR_BASE - 1
                                                - (tim_p->tm_year < 0
                                                   ? 0 : 2000)))));
            len = snprintf (&s[count], maxsize - count, CQ("%.2d"), week);
            if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          }
          break;
        case CQ('w'):
          if (count < maxsize - 1)
            s[count++] = CQ('0') + tim_p->tm_wday;
          else
            return 0;
          break;
        case CQ('W'):
          {
            int wday = (tim_p->tm_wday) ? tim_p->tm_wday - 1 : 6;
            len = snprintf (&s[count], maxsize - count, CQ("%.2d"),
                        (tim_p->tm_yday + 7 - wday) / 7);
            if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          }
          break;
        case CQ('y'):
            {
              /* Be careful of both overflow and negative years, thanks to
                 the asymmetric range of years.  */
              int year = tim_p->tm_year >= 0 ? tim_p->tm_year % 100
                : abs (tim_p->tm_year + YEAR_BASE) % 100;
              len = snprintf (&s[count], maxsize - count, CQ("%.2d"), year);
              if (len < 0  ||  (count+=len) >= maxsize)  return 0;
            }
          break;
        case CQ('Y'):
          /* An implementation choice is to have %Y match %C%y, so that it
           * gives at least 4 digits, with leading zeros as needed.  */
          if(tim_p->tm_year <= INT_MAX-YEAR_BASE)  {
            /* For normal, non-overflow case.  */
            len = snprintf (&s[count], maxsize - count, CQ("%04d"),
                                tim_p->tm_year + YEAR_BASE);
          }
          else  {
            /* int would overflow, so use unsigned instead.  */
            register unsigned year;
            year = (unsigned) tim_p->tm_year + (unsigned) YEAR_BASE;
            len = snprintf (&s[count], maxsize - count, CQ("%04u"),
                                tim_p->tm_year + YEAR_BASE);
          }
          if (len < 0  ||  (count+=len) >= maxsize)  return 0;
          break;
        case CQ('z'):
          if (tim_p->tm_isdst >= 0)
            {
              long offset;
              __tzinfo_type *tz = __gettzinfo ();
              TZ_LOCK;
              /* The sign of this is exactly opposite the envvar TZ.  We
                 could directly use the global _timezone for tm_isdst==0,
                 but have to use __tzrule for daylight savings.  */
              offset = -tz->__tzrule[tim_p->tm_isdst > 0].offset;
              TZ_UNLOCK;
              len = snprintf (&s[count], maxsize - count, CQ("%+03ld%.2ld"),
                        offset / SECSPERHOUR,
                        labs (offset / SECSPERMIN) % 60L);
              if (len < 0  ||  (count+=len) >= maxsize)  return 0;
            }
          break;
        case CQ('Z'):
          if (tim_p->tm_isdst >= 0)
            {
              int size;
              TZ_LOCK;
              size = strlen(_tzname[tim_p->tm_isdst > 0]);
              for (i = 0; i < size; i++)
                {
                  if (count < maxsize - 1)
                    s[count++] = _tzname[tim_p->tm_isdst > 0][i];
                  else
                    {
                      TZ_UNLOCK;
                      return 0;
                    }
                }
              TZ_UNLOCK;
            }
          break;
        case CQ('%'):
          if (count < maxsize - 1)
            s[count++] = CQ('%');
          else
            return 0;
          break;
        }
      if (*format)
        format++;
      else
        break;
    }
  if (maxsize)
    s[count] = CQ('\0');
 
  return count;
}
 
/* The remainder of this file can serve as a regression test.  Compile
 *  with -D_REGRESSION_TEST.  */
#if defined(_REGRESSION_TEST)   /* [Test code:  */
 
/* This test code relies on ANSI C features, in particular on the ability
 * of adjacent strings to be pasted together into one string.  */
 
/* Test output buffer size (should be larger than all expected results) */
#define OUTSIZE 256
 
struct test {
        CHAR  *fmt;     /* Testing format */
        size_t  max;    /* Testing maxsize */
        size_t  ret;    /* Expected return value */
        CHAR  *out;     /* Expected output string */
        };
struct list {
        const struct tm  *tms;  /* Time used for these vectors */
        const struct test *vec; /* Test vectors */
        int  cnt;               /* Number of vectors */
        };
 
const char  TZ[]="TZ=EST5EDT";
 
/* Define list of test inputs and expected outputs, for the given time zone
 * and time.  */
const struct tm  tm0 = {
        /* Tue Dec 30 10:53:47 EST 2008 (time_t=1230648827) */
        .tm_sec         = 47,
        .tm_min         = 53,
        .tm_hour        = 9,
        .tm_mday        = 30,
        .tm_mon         = 11,
        .tm_year        = 108,
        .tm_wday        = 2,
        .tm_yday        = 364,
        .tm_isdst       = 0
        };
const struct test  Vec0[] = {
        /* Testing fields one at a time, expecting to pass, using exact
         * allowed length as what is needed.  */
        /* Using tm0 for time: */
        #define EXP(s)  sizeof(s)/sizeof(CHAR)-1, s
        { CQ("%a"), 3+1, EXP(CQ("Tue")) },
        { CQ("%A"), 7+1, EXP(CQ("Tuesday")) },
        { CQ("%b"), 3+1, EXP(CQ("Dec")) },
        { CQ("%B"), 8+1, EXP(CQ("December")) },
        { CQ("%c"), 24+1, EXP(CQ("Tue Dec 30 09:53:47 2008")) },
        { CQ("%C"), 2+1, EXP(CQ("20")) },
        { CQ("%d"), 2+1, EXP(CQ("30")) },
        { CQ("%D"), 8+1, EXP(CQ("12/30/08")) },
        { CQ("%e"), 2+1, EXP(CQ("30")) },
        { CQ("%F"), 10+1, EXP(CQ("2008-12-30")) },
        { CQ("%g"), 2+1, EXP(CQ("09")) },
        { CQ("%G"), 4+1, EXP(CQ("2009")) },
        { CQ("%h"), 3+1, EXP(CQ("Dec")) },
        { CQ("%H"), 2+1, EXP(CQ("09")) },
        { CQ("%I"), 2+1, EXP(CQ("09")) },
        { CQ("%j"), 3+1, EXP(CQ("365")) },
        { CQ("%k"), 2+1, EXP(CQ(" 9")) },
        { CQ("%l"), 2+1, EXP(CQ(" 9")) },
        { CQ("%m"), 2+1, EXP(CQ("12")) },
        { CQ("%M"), 2+1, EXP(CQ("53")) },
        { CQ("%n"), 1+1, EXP(CQ("\n")) },
        { CQ("%p"), 2+1, EXP(CQ("AM")) },
        { CQ("%r"), 11+1, EXP(CQ("09:53:47 AM")) },
        { CQ("%R"), 5+1, EXP(CQ("09:53")) },
        { CQ("%S"), 2+1, EXP(CQ("47")) },
        { CQ("%t"), 1+1, EXP(CQ("\t")) },
        { CQ("%T"), 8+1, EXP(CQ("09:53:47")) },
        { CQ("%u"), 1+1, EXP(CQ("2")) },
        { CQ("%U"), 2+1, EXP(CQ("52")) },
        { CQ("%V"), 2+1, EXP(CQ("01")) },
        { CQ("%w"), 1+1, EXP(CQ("2")) },
        { CQ("%W"), 2+1, EXP(CQ("52")) },
        { CQ("%x"), 8+1, EXP(CQ("12/30/08")) },
        { CQ("%X"), 8+1, EXP(CQ("09:53:47")) },
        { CQ("%y"), 2+1, EXP(CQ("08")) },
        { CQ("%Y"), 4+1, EXP(CQ("2008")) },
        { CQ("%z"), 5+1, EXP(CQ("-0500")) },
        { CQ("%Z"), 3+1, EXP(CQ("EST")) },
        { CQ("%%"), 1+1, EXP(CQ("%")) },
        #undef EXP
        };
/* Define list of test inputs and expected outputs, for the given time zone
 * and time.  */
const struct tm  tm1 = {
        /* Wed Jul  2 23:01:13 EDT 2008 (time_t=1215054073) */
        .tm_sec         = 13,
        .tm_min         = 1,
        .tm_hour        = 23,
        .tm_mday        = 2,
        .tm_mon         = 6,
        .tm_year        = 108,
        .tm_wday        = 3,
        .tm_yday        = 183,
        .tm_isdst       = 1
        };
const struct test  Vec1[] = {
        /* Testing fields one at a time, expecting to pass, using exact
         * allowed length as what is needed.  */
        /* Using tm1 for time: */
        #define EXP(s)  sizeof(s)/sizeof(CHAR)-1, s
        { CQ("%a"), 3+1, EXP(CQ("Wed")) },
        { CQ("%A"), 9+1, EXP(CQ("Wednesday")) },
        { CQ("%b"), 3+1, EXP(CQ("Jul")) },
        { CQ("%B"), 4+1, EXP(CQ("July")) },
        { CQ("%c"), 24+1, EXP(CQ("Wed Jul  2 23:01:13 2008")) },
        { CQ("%C"), 2+1, EXP(CQ("20")) },
        { CQ("%d"), 2+1, EXP(CQ("02")) },
        { CQ("%D"), 8+1, EXP(CQ("07/02/08")) },
        { CQ("%e"), 2+1, EXP(CQ(" 2")) },
        { CQ("%F"), 10+1, EXP(CQ("2008-07-02")) },
        { CQ("%g"), 2+1, EXP(CQ("08")) },
        { CQ("%G"), 4+1, EXP(CQ("2008")) },
        { CQ("%h"), 3+1, EXP(CQ("Jul")) },
        { CQ("%H"), 2+1, EXP(CQ("23")) },
        { CQ("%I"), 2+1, EXP(CQ("11")) },
        { CQ("%j"), 3+1, EXP(CQ("184")) },
        { CQ("%k"), 2+1, EXP(CQ("23")) },
        { CQ("%l"), 2+1, EXP(CQ("11")) },
        { CQ("%m"), 2+1, EXP(CQ("07")) },
        { CQ("%M"), 2+1, EXP(CQ("01")) },
        { CQ("%n"), 1+1, EXP(CQ("\n")) },
        { CQ("%p"), 2+1, EXP(CQ("PM")) },
        { CQ("%r"), 11+1, EXP(CQ("11:01:13 PM")) },
        { CQ("%R"), 5+1, EXP(CQ("23:01")) },
        { CQ("%S"), 2+1, EXP(CQ("13")) },
        { CQ("%t"), 1+1, EXP(CQ("\t")) },
        { CQ("%T"), 8+1, EXP(CQ("23:01:13")) },
        { CQ("%u"), 1+1, EXP(CQ("3")) },
        { CQ("%U"), 2+1, EXP(CQ("26")) },
        { CQ("%V"), 2+1, EXP(CQ("27")) },
        { CQ("%w"), 1+1, EXP(CQ("3")) },
        { CQ("%W"), 2+1, EXP(CQ("26")) },
        { CQ("%x"), 8+1, EXP(CQ("07/02/08")) },
        { CQ("%X"), 8+1, EXP(CQ("23:01:13")) },
        { CQ("%y"), 2+1, EXP(CQ("08")) },
        { CQ("%Y"), 4+1, EXP(CQ("2008")) },
        { CQ("%z"), 5+1, EXP(CQ("-0400")) },
        { CQ("%Z"), 3+1, EXP(CQ("EDT")) },
        { CQ("%%"), 1+1, EXP(CQ("%")) },
        #undef EXP
        #define VEC(s)  s, sizeof(s)/sizeof(CHAR), sizeof(s)/sizeof(CHAR)-1, s
        #define EXP(s)  sizeof(s)/sizeof(CHAR), sizeof(s)/sizeof(CHAR)-1, s
        { VEC(CQ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")) },
        { CQ("0123456789%%%h:`~"), EXP(CQ("0123456789%Jul:`~")) },
        { CQ("%R%h:`~ %x %w"), EXP(CQ("23:01Jul:`~ 07/02/08 3")) },
        #undef VEC
        #undef EXP
        };
 
#if YEAR_BASE == 1900  /* ( */
/* Checks for very large years.  YEAR_BASE value relied upon so that the
 * answer strings can be predetermined.
 * Years more than 4 digits are not mentioned in the standard for %C, so the
 * test for those cases are based on the design intent (which is to print the
 * whole number, being the century).  */
const struct tm  tmyr0 = {
        /* Wed Jul  2 23:01:13 EDT [HUGE#] */
        .tm_sec         = 13,
        .tm_min         = 1,
        .tm_hour        = 23,
        .tm_mday        = 2,
        .tm_mon         = 6,
        .tm_year        = INT_MAX - YEAR_BASE/2,
        .tm_wday        = 3,
        .tm_yday        = 183,
        .tm_isdst       = 1
        };
#if INT_MAX == 32767
#  define YEAR  CQ("33717")             /* INT_MAX + YEAR_BASE/2 */
#  define CENT  CQ("337")
#  define Year     CQ("17")
# elif INT_MAX == 2147483647
#  define YEAR  CQ("2147484597")
#  define CENT  CQ("21474845")
#  define Year          CQ("97")
# elif INT_MAX == 9223372036854775807
#  define YEAR  CQ("9223372036854776757")
#  define CENT  CQ("92233720368547777")
#  define Year                   CQ("57")
# else
#  error "Unrecognized INT_MAX value:  enhance me to recognize what you have"
#endif
const struct test  Vecyr0[] = {
        /* Testing fields one at a time, expecting to pass, using a larger
         * allowed length than what is needed.  */
        /* Using tmyr0 for time: */
        #define EXP(s)  sizeof(s)/sizeof(CHAR)-1, s
        { CQ("%C"), OUTSIZE, EXP(CENT) },
        { CQ("%c"), OUTSIZE, EXP(CQ("Wed Jul  2 23:01:13 ")YEAR) },
        { CQ("%D"), OUTSIZE, EXP(CQ("07/02/")Year) },
        { CQ("%F"), OUTSIZE, EXP(YEAR CQ("-07-02")) },
        { CQ("%x"), OUTSIZE, EXP(CQ("07/02/")Year) },
        { CQ("%y"), OUTSIZE, EXP(Year) },
        { CQ("%Y"), OUTSIZE, EXP(YEAR) },
        #undef EXP
        };
#undef YEAR
#undef CENT
#undef Year
/* Checks for very large negative years.  YEAR_BASE value relied upon so that
 * the answer strings can be predetermined.  */
const struct tm  tmyr1 = {
        /* Wed Jul  2 23:01:13 EDT [HUGE#] */
        .tm_sec         = 13,
        .tm_min         = 1,
        .tm_hour        = 23,
        .tm_mday        = 2,
        .tm_mon         = 6,
        .tm_year        = INT_MIN,
        .tm_wday        = 3,
        .tm_yday        = 183,
        .tm_isdst       = 1
        };
#if INT_MAX == 32767
#  define YEAR  CQ("-30868")            /* INT_MIN + YEAR_BASE */
#  define CENT  CQ("-308")
#  define Year      CQ("68")
# elif INT_MAX == 2147483647
#  define YEAR  CQ("-2147481748")
#  define CENT  CQ("-21474817")
#  define Year           CQ("48")
# elif INT_MAX == 9223372036854775807
#  define YEAR  CQ("-9223372036854773908")
#  define CENT  CQ("-92233720368547739")
#  define Year                    CQ("08")
# else
#  error "Unrecognized INT_MAX value:  enhance me to recognize what you have"
#endif
const struct test  Vecyr1[] = {
        /* Testing fields one at a time, expecting to pass, using a larger
         * allowed length than what is needed.  */
        /* Using tmyr1 for time: */
        #define EXP(s)  sizeof(s)/sizeof(CHAR)-1, s
        { CQ("%C"), OUTSIZE, EXP(CENT) },
        { CQ("%c"), OUTSIZE, EXP(CQ("Wed Jul  2 23:01:13 ")YEAR) },
        { CQ("%D"), OUTSIZE, EXP(CQ("07/02/")Year) },
        { CQ("%F"), OUTSIZE, EXP(YEAR CQ("-07-02")) },
        { CQ("%x"), OUTSIZE, EXP(CQ("07/02/")Year) },
        { CQ("%y"), OUTSIZE, EXP(Year) },
        { CQ("%Y"), OUTSIZE, EXP(YEAR) },
        #undef EXP
        };
#undef YEAR
#undef CENT
#undef Year
#endif /* YEAR_BASE ) */
 
/* Checks for years just over zero (also test for s=60).
 * Years less than 4 digits are not mentioned for %Y in the standard, so the
 * test for that case is based on the design intent.  */
const struct tm  tmyrzp = {
        /* Wed Jul  2 23:01:60 EDT 0007 */
        .tm_sec         = 60,
        .tm_min         = 1,
        .tm_hour        = 23,
        .tm_mday        = 2,
        .tm_mon         = 6,
        .tm_year        = 7-YEAR_BASE,
        .tm_wday        = 3,
        .tm_yday        = 183,
        .tm_isdst       = 1
        };
#define YEAR    CQ("0007")      /* Design intent:  %Y=%C%y */
#define CENT    CQ("00")
#define Year      CQ("07")
const struct test  Vecyrzp[] = {
        /* Testing fields one at a time, expecting to pass, using a larger
         * allowed length than what is needed.  */
        /* Using tmyrzp for time: */
        #define EXP(s)  sizeof(s)/sizeof(CHAR)-1, s
        { CQ("%C"), OUTSIZE, EXP(CENT) },
        { CQ("%c"), OUTSIZE, EXP(CQ("Wed Jul  2 23:01:60 ")YEAR) },
        { CQ("%D"), OUTSIZE, EXP(CQ("07/02/")Year) },
        { CQ("%F"), OUTSIZE, EXP(YEAR CQ("-07-02")) },
        { CQ("%x"), OUTSIZE, EXP(CQ("07/02/")Year) },
        { CQ("%y"), OUTSIZE, EXP(Year) },
        { CQ("%Y"), OUTSIZE, EXP(YEAR) },
        #undef EXP
        };
#undef YEAR
#undef CENT
#undef Year
/* Checks for years just under zero.
 * Negative years are not handled by the standard, so the vectors here are
 * verifying the chosen implemtation.  */
const struct tm  tmyrzn = {
        /* Wed Jul  2 23:01:00 EDT -004 */
        .tm_sec         = 00,
        .tm_min         = 1,
        .tm_hour        = 23,
        .tm_mday        = 2,
        .tm_mon         = 6,
        .tm_year        = -4-YEAR_BASE,
        .tm_wday        = 3,
        .tm_yday        = 183,
        .tm_isdst       = 1
        };
#define YEAR    CQ("-004")
#define CENT    CQ("-0")
#define Year      CQ("04")
const struct test  Vecyrzn[] = {
        /* Testing fields one at a time, expecting to pass, using a larger
         * allowed length than what is needed.  */
        /* Using tmyrzn for time: */
        #define EXP(s)  sizeof(s)/sizeof(CHAR)-1, s
        { CQ("%C"), OUTSIZE, EXP(CENT) },
        { CQ("%c"), OUTSIZE, EXP(CQ("Wed Jul  2 23:01:00 ")YEAR) },
        { CQ("%D"), OUTSIZE, EXP(CQ("07/02/")Year) },
        { CQ("%F"), OUTSIZE, EXP(YEAR CQ("-07-02")) },
        { CQ("%x"), OUTSIZE, EXP(CQ("07/02/")Year) },
        { CQ("%y"), OUTSIZE, EXP(Year) },
        { CQ("%Y"), OUTSIZE, EXP(YEAR) },
        #undef EXP
        };
#undef YEAR
#undef CENT
#undef Year
 
const struct list  ListYr[] = {
        { &tmyrzp, Vecyrzp, sizeof(Vecyrzp)/sizeof(Vecyrzp[0]) },
        { &tmyrzn, Vecyrzn, sizeof(Vecyrzn)/sizeof(Vecyrzn[0]) },
        #if YEAR_BASE == 1900
        { &tmyr0, Vecyr0, sizeof(Vecyr0)/sizeof(Vecyr0[0]) },
        { &tmyr1, Vecyr1, sizeof(Vecyr1)/sizeof(Vecyr1[0]) },
        #endif
        };
 
 
/* List of tests to be run */
const struct list  List[] = {
        { &tm0, Vec0, sizeof(Vec0)/sizeof(Vec0[0]) },
        { &tm1, Vec1, sizeof(Vec1)/sizeof(Vec1[0]) },
        };
 
#if defined(STUB_getenv_r)
char *
_getenv_r(struct _reent *p, const char *cp) { return getenv(cp); }
#endif
 
int
main(void)
{
int  i, l, errr=0, erro=0, tot=0;
const char  *cp;
CHAR  out[OUTSIZE];
size_t  ret;
 
/* Set timezone so that %z and %Z tests come out right */
cp = TZ;
if((i=putenv(cp)))  {
    printf( "putenv(%s) FAILED, ret %d\n", cp, i);
    return(-1);
    }
if(strcmp(getenv("TZ"),strchr(TZ,'=')+1))  {
    printf( "TZ not set properly in environment\n");
    return(-2);
    }
tzset();
 
#if defined(VERBOSE)
printf("_timezone=%d, _daylight=%d, _tzname[0]=%s, _tzname[1]=%s\n", _timezone, _daylight, _tzname[0], _tzname[1]);
{
long offset;
__tzinfo_type *tz = __gettzinfo ();
/* The sign of this is exactly opposite the envvar TZ.  We
   could directly use the global _timezone for tm_isdst==0,
   but have to use __tzrule for daylight savings.  */
printf("tz->__tzrule[0].offset=%d, tz->__tzrule[1].offset=%d\n", tz->__tzrule[0].offset, tz->__tzrule[1].offset);
}
#endif
 
/* Run all of the exact-length tests as-given--results should match */
for(l=0; l<sizeof(List)/sizeof(List[0]); l++)  {
    const struct list  *test = &List[l];
    for(i=0; i<test->cnt; i++)  {
        tot++;  /* Keep track of number of tests */
        ret = strftime(out, test->vec[i].max, test->vec[i].fmt, test->tms);
        if(ret != test->vec[i].ret)  {
            errr++;
            fprintf(stderr,
                "ERROR:  return %d != %d expected for List[%d].vec[%d]\n",
                                                ret, test->vec[i].ret, l, i);
            }
        if(strncmp(out, test->vec[i].out, test->vec[i].max-1))  {
            erro++;
            fprintf(stderr,
                "ERROR:  \"%"SFLG"s\" != \"%"SFLG"s\" expected for List[%d].vec[%d]\n",
                                                out, test->vec[i].out, l, i);
            }
        }
    }
 
/* Run all of the exact-length tests with the length made too short--expect to
 * fail.  */
for(l=0; l<sizeof(List)/sizeof(List[0]); l++)  {
    const struct list  *test = &List[l];
    for(i=0; i<test->cnt; i++)  {
        tot++;  /* Keep track of number of tests */
        ret = strftime(out, test->vec[i].max-1, test->vec[i].fmt, test->tms);
        if(ret != 0)  {
            errr++;
            fprintf(stderr,
                "ERROR:  return %d != %d expected for List[%d].vec[%d]\n",
                                                ret, 0, l, i);
            }
        /* Almost every conversion puts out as many characters as possible, so
         * go ahead and test the output even though have failed.  (The test
         * times chosen happen to not hit any of the cases that fail this, so it
         * works.)  */
        if(strncmp(out, test->vec[i].out, test->vec[i].max-1-1))  {
            erro++;
            fprintf(stderr,
                "ERROR:  \"%"SFLG"s\" != \"%"SFLG"s\" expected for List[%d].vec[%d]\n",
                                                out, test->vec[i].out, l, i);
            }
        }
    }
 
/* Run all of the special year test cases */
for(l=0; l<sizeof(ListYr)/sizeof(ListYr[0]); l++)  {
    const struct list  *test = &ListYr[l];
    for(i=0; i<test->cnt; i++)  {
        tot++;  /* Keep track of number of tests */
        ret = strftime(out, test->vec[i].max, test->vec[i].fmt, test->tms);
        if(ret != test->vec[i].ret)  {
            errr++;
            fprintf(stderr,
                "ERROR:  return %d != %d expected for ListYr[%d].vec[%d]\n",
                                                ret, test->vec[i].ret, l, i);
            }
        if(strncmp(out, test->vec[i].out, test->vec[i].max-1))  {
            erro++;
            fprintf(stderr,
                "ERROR:  \"%"SFLG"s\" != \"%"SFLG"s\" expected for ListYr[%d].vec[%d]\n",
                                                out, test->vec[i].out, l, i);
            }
        }
    }
 
#define STRIZE(f)       #f
#define NAME(f) STRIZE(f)
printf(NAME(strftime) "() test ");
if(errr || erro)  printf("FAILED %d/%d of", errr, erro);
  else    printf("passed");
printf(" %d test cases.\n", tot);
 
return(errr || erro);
}
#endif /* defined(_REGRESSION_TEST) ] */
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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [time/] [strftime.c] - Blame information for rev 252

Line No.	Rev	Author	Line
1	207	jeremybenn	`/* NOTE: This file defines both strftime() and wcsftime(). Take care when`
2			`* making changes. See also wcsftime.c, and note the (small) overlap in the`
3			`* manual description, taking care to edit both as needed. */`
4			`/*`
5			`* strftime.c`
6			`* Original Author: G. Haley`
7			`* Additions from: Eric Blake`
8			`* Changes to allow dual use as wcstime, also: Craig Howland`
9			`*`
10			`* Places characters into the array pointed to by s as controlled by the string`
11			`* pointed to by format. If the total number of resulting characters including`
12			`* the terminating null character is not more than maxsize, returns the number`
13			`* of characters placed into the array pointed to by s (not including the`
14			`* terminating null character); otherwise zero is returned and the contents of`
15			`* the array indeterminate.`
16			`*/`
17
18			`/*`
19			`FUNCTION`
20			`<<strftime>>---convert date and time to a formatted string`
21
22			`INDEX`
23			`strftime`
24
25			`ANSI_SYNOPSIS`
26			`#include <time.h>`
27			`size_t strftime(char *<[s]>, size_t <[maxsize]>,`
28			`const char <[format]>, const struct tm <[timp]>);`
29
30			`TRAD_SYNOPSIS`
31			`#include <time.h>`
32			`size_t strftime(<[s]>, <[maxsize]>, <[format]>, <[timp]>)`
33			`char *<[s]>;`
34			`size_t <[maxsize]>;`
35			`char *<[format]>;`
36			`struct tm *<[timp]>;`
37
38			`DESCRIPTION`
39			`<<strftime>> converts a <<struct tm>> representation of the time (at`
40			`<[timp]>) into a null-terminated string, starting at <[s]> and occupying`