update from main archive 960911cvs/libc-960912

Thu Sep 12 03:35:27 1996  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/unix/sysv/linux/i386/Dist: Remove init-first.h.
	* sysdeps/unix/sysv/linux/m68k/Dist: Likewise.
	* sysdeps/unix/sysv/linux/Dist: Add init-first.h.

1996-09-11  Paul Eggert  <eggert@twinsun.com>

	* strftime.c (strftime):
	Handle E and O modifiers, required for POSIX.2 and XPG4.
	Don't use sprintf to format numbers; this way, we can handle time_t
	correctly regardless of whether it's signed.
	Don't dump core if format ends in %.
	In default %c format, use %e instead of %d, for POSIX.2 compatibility.
	For %z:
		Use tm_gmtoff if available.
		Output nothing if tm_isdst is negative.
		Output correct value even if arg is 1969-12-31 23:59:59 UTC.
		Don't assume that UTC offset is less than 24 hours;
		Posix requires support for 24 hours, and there's no point
		limiting it at all.
	(HAVE_TM_GMTOFF, TYPE_SIGNED, INT_STRLEN_BOUND): New macros.
	(CHAR_BIT): Define if <limits.h> doesn't.
	(tm_diff): New function.
	(fmt, <stdio.h>): Remove; no longer used.

Thu Sep 12 02:21:44 1996  Ulrich Drepper  <drepper@cygnus.com>

	* db/Makefile: Add extra-libs-others variable so that shared
	library is built in `others' pass.
	* elf/Makefile: Likewise.
	* math/Makefile: Likewise.
	* resolv/Makefile: Likewise.

	* Makefile (generated): Add version.info.h.

	* time/checktab.awk: New file.  From ADO 96k.
	* time/iso3166.tab: Likewise.
	* time/tzselect.ksh: Likewise.
	* time/zone.tab: Likewise.

	* stdio-common/vfprintf.c: Correct cleanup registration.  We
	cannot use a macro

1996-09-11  Paul Eggert  <eggert@twinsun.com>

	* time/time.h (tm_gmtoff, tm_zone): Prefix with `__' unless
	__USE_BSD; this is required for ANSI C compatibility.
	* manual/time.texi: Replace GMT by UTC, daylight savings by
 	daylight saving, timezone by time zone.
	Rewrite description of %V to match ISO 8601.
	Fix TZ Posix string example for US Eastern time.
	Explain tzname[1] when DST isn't used.
	Explain tzname when multiple abbreviations used (e.g. EST/EWT/EDT).
	Explain that timezone's sign is opposite from tm_gmtoff, and that
	timezone lacks DST adjustment whereas tm_gmtoff has it.
	Deprecate tzname and timezone.

Tue Sep 10 14:46:16 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	Implement Roland McGrath's idea of how to put an .interp into
	shared libraries.
	* interp.c: New file.
	* Makerules (interp-obj): New object, linked into every shared
	library.
	(common-generated): Add interp.so.
	(CFLAGS-interp.c): Pass name of interpreter.

Tue Sep 10 21:09:35 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* db/Makefile: Fix typo.

Tue Sep 10 19:29:53 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* nss/db-Makefile ($(VAR_DB)/passwd.db): Look for multiple
	occurences of the same uid, and only generate a mapping for the
	first one.

Tue Sep 10 03:14:59 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/sysv/linux/system.c: New file, to override
	sysdeps/unix/system.c.

Tue Sep 10 15:05:40 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* Makefile (before-compile): Add version-info.h, needed to build
	version.d.

Tue Sep 10 14:14:33 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/sysv/linux/m68k/sysdep.S: Remove check for
	EWOULDBLOCK, never true on Linux.
	(__errno_location): New function.
	[_LIBC_REENTRANT]: Set errno using __errno_location function.
	* sysdeps/unix/sysv/linux/m68k/sysdep.h [PIC]: Add second
 	syscall_error handler for reentrant libc.

Tue Sep 10 13:27:49 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* elf/Makefile (extra-objs): Add eval.so to get dependencies.

Wed Sep 11 04:40:57 1996  Ulrich Drepper  <drepper@cygnus.com>

	* time/tzset.c (__tzname_cur_max): Use type `size_t' to avoid
 	warning.
	* time/tzfile.c (compute_tzname_max): Likewise.

1 files changed, 301 insertions, 98 deletions

diff --git a/time/strftime.c b/time/strftime.c
index 129fd14..26f4b7f 100644
--- a/time/strftime.c
+++ b/time/strftime.c
@@ -23,13 +23,13 @@ Cambridge, MA 02139, USA.  */
 #ifdef _LIBC
 # define HAVE_LIMITS_H 1
 # define HAVE_MBLEN 1
+# define HAVE_TM_GMTOFF 1
 # define HAVE_TM_ZONE 1
 # define STDC_HEADERS 1
 # include <ansidecl.h>
 # include "../locale/localeinfo.h"
 #endif
 
-#include <stdio.h>
 #include <sys/types.h>		/* Some systems define `time_t' here.  */
 
 #ifdef TIME_WITH_SYS_TIME
@@ -75,9 +75,22 @@ Cambridge, MA 02139, USA.  */
 #endif
 #endif
 
-/* Uncomment following line in the production version.  */
-/* #define NDEBUG */
-#include <assert.h>
+#ifndef CHAR_BIT
+#define CHAR_BIT 8
+#endif
+
+#define TYPE_SIGNED(t) ((t) -1 < 0)
+
+/* Bound on length of the string representing an integer value of type t.
+   Subtract one for the sign bit if t is signed;
+   302 / 1000 is log10 (2) rounded up;
+   add one for integer division truncation;
+   add one more for a minus sign if t is signed.  */
+#define INT_STRLEN_BOUND(t) \
+  ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 100 + 1 + TYPE_SIGNED (t))
+
+#define TM_YEAR_BASE 1900
+
 
 static unsigned int week __P ((const struct tm *const, int, int));
 
@@ -97,11 +110,30 @@ static unsigned int week __P ((const struct tm *const, int, int));
     } while (0)
 #define	cpy(n, s)	add ((n), memcpy((PTR) p, (PTR) (s), (n)))
 
-#ifdef _LIBC
-#define	fmt(n, args)	add((n), if (sprintf args != (n)) return 0)
-#else
-#define	fmt(n, args)	add((n), sprintf args; if (strlen (p) != (n)) return 0)
-#endif
+#if ! HAVE_TM_GMTOFF
+/* Yield the difference between *A and *B,
+   measured in seconds, ignoring leap seconds.  */
+static int tm_diff __P ((const struct tm *, const struct tm *));
+static int
+tm_diff (a, b)
+     const struct tm *a;
+     const struct tm *b;
+{
+  int ay = a->tm_year + TM_YEAR_BASE - 1;
+  int by = b->tm_year + TM_YEAR_BASE - 1;
+  /* Divide years by 100, rounding towards minus infinity.  */
+  int ac = ay / 100 - (ay % 100 < 0);
+  int bc = by / 100 - (by % 100 < 0);
+  int intervening_leap_days =
+    ((ay >> 2) - (by >> 2)) - (ac - bc) + ((ac >> 2) - (bc >> 2));
+  int years = ay - by;
+  int days = (365 * years + intervening_leap_days
+	      + (a->tm_yday - b->tm_yday));
+  return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
+		+ (a->tm_min - b->tm_min))
+	  + (a->tm_sec - b->tm_sec));
+}
+#endif /* ! HAVE_TM_GMTOFF */
 
 
 
@@ -181,6 +213,9 @@ strftime (s, maxsize, format, tp)
   size_t aw_len = strlen(a_wkday);
   size_t am_len = strlen(a_month);
   size_t ap_len = strlen (ampm);
+
+  const char * const*alt_digits = &_NL_CURRENT (LC_TIME, ALT_DIGITS);
+  int nr_alt_digits = (_NL_CURRENT (LC_TIME, ALT_DIGITS + 1) - *alt_digits);
 #else
   const char *const f_wkday = weekday_name[tp->tm_wday];
   const char *const f_month = month_name[tp->tm_mon];
@@ -201,10 +236,6 @@ strftime (s, maxsize, format, tp)
   register size_t i = 0;
   register char *p = s;
   register const char *f;
-  char number_fmt[5];
-
-  /* Initialize the buffer we will use for the sprintf format for numbers.  */
-  number_fmt[0] = '%';
 
   zone = 0;
 #if HAVE_TM_ZONE
@@ -227,9 +258,15 @@ strftime (s, maxsize, format, tp)
   for (f = format; *f != '\0'; ++f)
     {
       enum { pad_zero, pad_space, pad_none } pad; /* Padding for number.  */
-      unsigned int maxdigits;	/* Max digits for numeric format.  */
+      unsigned int digits;	/* Max digits for numeric format.  */
       unsigned int number_value; /* Numeric value to be printed.  */
-      const char *subfmt;
+      int negative_number;	/* 1 if the number is negative.  */
+      const char *subfmt = "";
+      enum { none, alternate, era } modifier;
+      char *bufp;
+      char buf[1 + (sizeof (int) < sizeof (time_t)
+		    ? INT_STRLEN_BOUND (time_t)
+		    : INT_STRLEN_BOUND (int))];
 
 #if HAVE_MBLEN
       if (!isascii (*f))
@@ -267,37 +304,76 @@ strftime (s, maxsize, format, tp)
 	  break;
 	}
 
+      /* Check for modifiers.  */
+      switch (*f)
+	{
+	case 'E':
+	  ++f;
+	  modifier = era;
+	  break;
+	case 'O':
+	  ++f;
+	  modifier = alternate;
+	  break;
+	default:
+	  modifier = none;
+	  break;
+	}
+
       /* Now do the specified format.  */
       switch (*f)
 	{
-	case '\0':
+#define DO_NUMBER(d, v) \
+	  digits = d; number_value = v; goto do_number
+#define DO_NUMBER_SPACEPAD(d, v) \
+	  digits = d; number_value = v; goto do_number_spacepad
+
+	case '\0':		/* GNU extension: % at end of format.  */
+	    --f;
+	    /* Fall through.  */
 	case '%':
+	  if (modifier != none)
+	    goto bad_format;
 	  add (1, *p = *f);
 	  break;
 
 	case 'a':
+	  if (modifier != none)
+	    goto bad_format;
 	  cpy (aw_len, a_wkday);
 	  break;
 
 	case 'A':
+	  if (modifier != none)
+	    goto bad_format;
 	  cpy (wkday_len, f_wkday);
 	  break;
 
 	case 'b':
 	case 'h':		/* GNU extension.  */
+	  if (modifier != none)
+	    goto bad_format;
 	  cpy (am_len, a_month);
 	  break;
 
 	case 'B':
+	  if (modifier != none)
+	    goto bad_format;
 	  cpy (month_len, f_month);
 	  break;
 
 	case 'c':
+	  if (modifier == alternate)
+	    goto bad_format;
 #ifdef _NL_CURRENT
-	  subfmt = _NL_CURRENT (LC_TIME, D_T_FMT);
+	  if (modifier == era)
+	    subfmt = _NL_CURRENT (LC_TIME, ERA_D_T_FMT);
+	  if (*subfmt == '\0')
+	    subfmt = _NL_CURRENT (LC_TIME, D_T_FMT);
 #else
-	  subfmt = "%a %b %d %H:%M:%S %Z %Y";
+	  subfmt = "%a %b %e %H:%M:%S %Z %Y";
 #endif
+
 	subformat:
 	  {
 	    size_t len = strftime (p, maxsize - i, subfmt, tp);
@@ -307,17 +383,25 @@ strftime (s, maxsize, format, tp)
 	  }
 	  break;
 
-#define DO_NUMBER(digits, value) \
-	  maxdigits = digits; number_value = value; goto do_number
-#define DO_NUMBER_SPACEPAD(digits, value) \
-	  maxdigits = digits; number_value = value; goto do_number_spacepad
-
 	case 'C':
+	  if (modifier == alternate)
+	    goto bad_format;
+#ifdef _NL_CURRENT
+	  /* XXX I'm not sure about this.  --drepper@gnu */
+	  if (modifier == era &&
+	      *(subfmt = _NL_CURRENT (LC_TIME, ERA)) != '\0')
+	    goto subformat;
+#endif
 	  DO_NUMBER (2, (1900 + tp->tm_year) / 100);
 
 	case 'x':
+	  if (modifier == alternate)
+	    goto bad_format;
 #ifdef _NL_CURRENT
-	  subfmt = _NL_CURRENT (LC_TIME, D_FMT);
+	  if (modifier == era)
+	    subfmt = _NL_CURRENT (LC_TIME, ERA_D_FMT);
+	  if (*subfmt == '\0')
+	    subfmt = _NL_CURRENT (LC_TIME, D_FMT);
 	  goto subformat;
 #endif
 	  /* Fall through.  */
@@ -326,12 +410,18 @@ strftime (s, maxsize, format, tp)
 	  goto subformat;
 
 	case 'd':
+	  if (modifier == era)
+	    goto bad_format;
+
 	  DO_NUMBER (2, tp->tm_mday);
 
 	case 'e':		/* GNU extension: %d, but blank-padded.  */
+	  if (modifier == era)
+	    goto bad_format;
+
 	  DO_NUMBER_SPACEPAD (2, tp->tm_mday);
 
-	  /* All numeric formats set MAXDIGITS and NUMBER_VALUE and then
+	  /* All numeric formats set DIGITS and NUMBER_VALUE and then
 	     jump to one of these two labels.  */
 
 	do_number_spacepad:
@@ -339,56 +429,106 @@ strftime (s, maxsize, format, tp)
 	  pad = pad_space;
 
 	do_number:
+	  /* Format the number according to the MODIFIER flag.  */
+
+#ifdef _NL_CURRENT
+	  if (modifier == alternate && 0 <= number_value
+	      && number_value < (unsigned int) nr_alt_digits)
+	    {
+	      /* ALT_DIGITS is the first entry in an array with
+		 alternative digit symbols.  */
+	      size_t digitlen = strlen (*(alt_digits + number_value));
+	      if (digitlen == 0)
+		break;
+	      cpy (digitlen, *(alt_digits + number_value));
+	      goto done_with_number;
+	    }
+#endif
 	  {
-	    /* Format the number according to the PAD flag.  */
+	    unsigned int u = number_value;
 
-	    register char *nf = &number_fmt[1];
-	    int printed = maxdigits;
+	    bufp = buf + sizeof (buf);
+	    negative_number = number_value < 0;
 
-	    switch (pad)
-	      {
-	      case pad_zero:
-		*nf++ = '0';
-	      case pad_space:
-		*nf++ = '0' + maxdigits;
-	      case pad_none:
-		*nf++ = 'u';
-		*nf = '\0';
-	      }
+	    if (negative_number)
+	      u = -u;
 
-#ifdef _LIBC
-	    add (maxdigits, printed = sprintf (p, number_fmt, number_value));
-#else
-	    add (maxdigits, sprintf (p, number_fmt, number_value);
-		 printed = strlen (p));
-#endif
-	    /* Back up if fewer than MAXDIGITS chars written for pad_none.  */
-	    p -= maxdigits - printed;
-	    i -= maxdigits - printed;
+	    do
+	      *--bufp = u % 10 + '0';
+	    while ((u /= 10) != 0);
+  	  }
 
-	    break;
-	  }
+	do_number_sign_and_padding:
+	  if (negative_number)
+	    *--bufp = '-';
+
+	  if (pad != pad_none)
+	    {
+	      int padding = digits - (buf + sizeof (buf) - bufp);
+
+	      if (pad == pad_space)
+		{
+		  while (0 < padding--)
+		    *--bufp = ' ';
+		}
+	      else
+		{
+		  bufp += negative_number;
+		  while (0 < padding--)
+		    *--bufp = '0';
+		  if (negative_number)
+		    *--bufp = '-';
+		}
+	    }
+
+	  cpy (buf + sizeof (buf) - bufp, bufp);
+
+#ifdef _NL_CURRENT
+	done_with_number:
+#endif
+	  break;
 
 
 	case 'H':
+	  if (modifier == era)
+	    goto bad_format;
+
 	  DO_NUMBER (2, tp->tm_hour);
 
 	case 'I':
+	  if (modifier == era)
+	    goto bad_format;
+
 	  DO_NUMBER (2, hour12);
 
 	case 'k':		/* GNU extension.  */
+	  if (modifier == era)
+	    goto bad_format;
+
 	  DO_NUMBER_SPACEPAD (2, tp->tm_hour);
 
 	case 'l':		/* GNU extension.  */
+	  if (modifier == era)
+	    goto bad_format;
+
 	  DO_NUMBER_SPACEPAD (2, hour12);
 
 	case 'j':
+	  if (modifier == era)
+	    goto bad_format;
+
 	  DO_NUMBER (3, 1 + tp->tm_yday);
 
 	case 'M':
+	  if (modifier == era)
+	    goto bad_format;
+
 	  DO_NUMBER (2, tp->tm_min);
 
 	case 'm':
+	  if (modifier == era)
+	    goto bad_format;
+
 	  DO_NUMBER (2, tp->tm_mon + 1);
 
 	case 'n':		/* GNU extension.  */
@@ -408,32 +548,55 @@ strftime (s, maxsize, format, tp)
 	  goto subformat;
 
 	case 'S':
+	  if (modifier == era)
+	    return 0;
+
 	  DO_NUMBER (2, tp->tm_sec);
 
 	case 's':		/* GNU extension.  */
-	  {
-	    struct tm writable_tm = *tp;
-	    unsigned long int num = (unsigned long int) mktime (&writable_tm);
-	    /* `3 * sizeof (unsigned long int)' is an approximation of
-	       the size of the decimal representation of NUM, valid
-	       for sizes <= 16.  */
-	    int printed = 3 * sizeof (unsigned long int);
-	    maxdigits = printed;
-	    assert (sizeof (unsigned long int) <= 16);
-#ifdef _LIBC
-	    add (maxdigits, printed = sprintf (p, "%lu", num));
-#else
-	    add (maxdigits, sprintf (p, "%lu", num); printed = strlen (p));
-#endif
-	    /* Back up if fewer than MAXDIGITS chars written for pad_none.  */
-	    p -= maxdigits - printed;
-	    i -= maxdigits - printed;
+  	  {
+	    struct tm ltm = *tp;
+	    time_t t = mktime (&ltm);
+
+	    /* Generate string value for T using time_t arithmetic;
+	       this works even if sizeof (long) < sizeof (time_t).  */
+
+	    bufp = buf + sizeof (buf);
+	    negative_number = t < 0;
+
+	    do
+	      {
+		int d = t % 10;
+		t /= 10;
+
+		if (negative_number)
+		  {
+		    d = -d;
+
+		    /* Adjust if division truncates to minus infinity.  */
+		    if (0 < -1 % 10 && d < 0)
+		      {
+			t++;
+			d += 10;
+		      }
+		  }
+
+		*--bufp = d + '0';
+	      }
+	    while (t != 0);
+
+	    digits = 1;
+	    goto do_number_sign_and_padding;
 	  }
-	break;
 
 	case 'X':
+	  if (modifier == alternate)
+	    goto bad_format;
 #ifdef _NL_CURRENT
-	  subfmt = _NL_CURRENT (LC_TIME, T_FMT);
+	  if (modifier == era)
+	    subfmt = _NL_CURRENT (LC_TIME, ERA_T_FMT);
+	  if (*subfmt == '\0')
+	    subfmt = _NL_CURRENT (LC_TIME, T_FMT);
 	  goto subformat;
 #endif
 	  /* Fall through.  */
@@ -446,61 +609,88 @@ strftime (s, maxsize, format, tp)
 	  break;
 
 	case 'U':
+	  if (modifier == era)
+	    goto bad_format;
+
 	  DO_NUMBER (2, y_week0);
 
 	case 'V':
+	  if (modifier == era)
+	    goto bad_format;
+
 	  DO_NUMBER (2, y_week2);
 
 	case 'W':
+	  if (modifier == era)
+	    goto bad_format;
+
 	  DO_NUMBER (2, y_week1);
 
 	case 'w':
+	  if (modifier == era)
+	    goto bad_format;
+
 	  DO_NUMBER (2, tp->tm_wday);
 
 	case 'Y':
-	  DO_NUMBER (4, 1900 + tp->tm_year);
+#ifdef _NL_CURRENT
+	  if (modifier == era
+	      && *(subfmt = _NL_CURRENT (LC_TIME, ERA_YEAR)) != '\0')
+	    goto subformat;
+	  else
+#endif
+	    if (modifier == alternate)
+	      goto bad_format;
+	    else
+	      DO_NUMBER (4, 1900 + tp->tm_year);
 
 	case 'y':
+#ifdef _NL_CURRENT
+	  if (modifier == era
+	      && *(subfmt = _NL_CURRENT (LC_TIME, ERA_YEAR)) != '\0')
+	    goto subformat;
+#endif
 	  DO_NUMBER (2, tp->tm_year % 100);
 
 	case 'Z':
 	  cpy(zonelen, zone);
 	  break;
 
-	case 'z':
+	case 'z':		/* GNU extension.  */
+	  if (tp->tm_isdst < 0)
+	    break;
+
 	  {
-	    struct tm tml = *tp;
-	    struct tm tmg;
-	    time_t t;
-	    time_t offset = 0;
 	    int diff;
+#if HAVE_TM_GMTOFF
+	    diff = tp->tm_gmtoff;
+#else
+	    struct tm gtm;
+	    struct tm ltm = *tp;
+	    time_t lt = mktime (&ltm);
 
-	    t = __mktime_internal (&tml, __localtime_r, &offset);
-
-	    /* Canonicalize the local time.  */
-	    if (t == (time_t) -1 || __localtime_r (&t, &tml) == NULL)
-	      /* We didn't managed to get the local time.  Assume it
-		 GMT as a reasonable default value.  */
-	      diff = 0;
-	    else
+	    if (lt == (time_t) -1)
 	      {
-		__gmtime_r (&t, &tmg);
+		/* mktime returns -1 for errors, but -1 is also a
+		   valid time_t value.  Check whether an error really
+		   occurred.  */
+		struct tm tm;
+		localtime_r (&lt, &tm);
+
+		if ((ltm.tm_sec ^ tm.tm_sec)
+		    | (ltm.tm_min ^ tm.tm_min)
+		    | (ltm.tm_hour ^ tm.tm_hour)
+		    | (ltm.tm_mday ^ tm.tm_mday)
+		    | (ltm.tm_mon ^ tm.tm_mon)
+		    | (ltm.tm_year ^ tm.tm_year))
+		  break;
+	      }
 
-		/* Compute the difference.  */
-		diff = tml.tm_min - tmg.tm_min;
-		diff += 60 * (tml.tm_hour - tmg.tm_hour);
+	    if (! gmtime_r (&lt, &gtm))
+	      break;
 
-		if (tml.tm_mon != tmg.tm_mon)
-		  {
-		    /* We assume no timezone differs from UTC by more
-		       than +- 23 hours.  This should be safe.  */
-		    if (tmg.tm_mday == 1)
-		      tml.tm_mday = 0;
-		    else /* tml.tm_mday == 1 */
-		      tmg.tm_mday = 0;
-		  }
-		diff += 1440 * (tml.tm_mday - tmg.tm_mday);
-	      }
+	    diff = tm_diff (&ltm, &gtm);
+#endif
 
 	    if (diff < 0)
 	      {
@@ -511,11 +701,24 @@ strftime (s, maxsize, format, tp)
 	      add (1, *p = '+');
 
 	    pad = pad_zero;
-	    DO_NUMBER (4, ((diff / 60) % 24) * 100 + diff % 60);
+
+	    diff /= 60;
+	    DO_NUMBER (4, (diff / 60) * 100 + diff % 60);
 	  }
 
 	default:
 	  /* Bad format.  */
+	bad_format:
+	  if (pad == pad_space)
+	    add (1, *p = '_');
+	  else if (pad == pad_zero)
+	    add (1, *p = '0');
+
+	  if (modifier == era)
+	    add (1, *p = 'E');
+	  else if (modifier == alternate)
+	    add (1, *p = 'O');
+
 	  add (1, *p = *f);
 	  break;
 	}