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Update.
1999-10-30 Ulrich Drepper <drepper@cygnus.com> * manual/time.texi (Formatting Date and Time): Revise comments about origins of the formats with ISO C99 references. 1999-10-30 Andreas Jaeger <aj@suse.de> * sysdeps/unix/sysv/linux/ifreq.h: New file. 1999-10-29 Andreas Jaeger <aj@suse.de> * manual/arith.texi (Parsing of Floats): Document the hexadecimal input format; mention that strtof and strtold are part of ISO C99.
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Ulrich Drepper
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ChangeLog
14
ChangeLog
@ -1,3 +1,17 @@
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1999-10-30 Ulrich Drepper <drepper@cygnus.com>
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* manual/time.texi (Formatting Date and Time): Revise comments about
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origins of the formats with ISO C99 references.
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1999-10-30 Andreas Jaeger <aj@suse.de>
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* sysdeps/unix/sysv/linux/ifreq.h: New file.
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1999-10-29 Andreas Jaeger <aj@suse.de>
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* manual/arith.texi (Parsing of Floats): Document the hexadecimal
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input format; mention that strtof and strtold are part of ISO C99.
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1999-10-29 Ulrich Drepper <drepper@cygnus.com>
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* manual/math.texi (Errors in Math Functions): New section.
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@ -2101,6 +2101,10 @@ are whitespace is determined by the @code{isspace} function
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@item
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An optional plus or minus sign (@samp{+} or @samp{-}).
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@item A floating point number in decimal or hexadecimal format. The
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decimal format is:
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@itemize @minus
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@item
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A nonempty sequence of digits optionally containing a decimal-point
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character---normally @samp{.}, but it depends on the locale
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@ -2110,6 +2114,22 @@ character---normally @samp{.}, but it depends on the locale
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An optional exponent part, consisting of a character @samp{e} or
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@samp{E}, an optional sign, and a sequence of digits.
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@end itemize
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The hexadecimal format is as follows:
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@itemize @minus
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@item
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A 0x or 0X followed by a nonempty sequence of hexadecimal digits
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optionally containing a decimal-point character---normally @samp{.}, but
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it depends on the locale (@pxref{General Numeric}).
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@item
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An optional binary-exponent part, consisting of a character @samp{p} or
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@samp{P}, an optional sign, and a sequence of digits.
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@end itemize
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@item
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Any remaining characters in the string. If @var{tailptr} is not a null
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pointer, a pointer to this tail of the string is stored in
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@ -2146,10 +2166,10 @@ examining @var{errno} and @var{tailptr}.
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@end deftypefun
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@comment stdlib.h
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@comment GNU
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@comment ISO C
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@deftypefun float strtof (const char *@var{string}, char **@var{tailptr})
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@comment stdlib.h
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@comment GNU
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@comment ISO C
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@deftypefunx {long double} strtold (const char *@var{string}, char **@var{tailptr})
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These functions are analogous to @code{strtod}, but return @code{float}
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and @code{long double} values respectively. They report errors in the
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@ -2158,7 +2178,7 @@ than @code{strtod}, but has less precision; conversely, @code{strtold}
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can be much slower but has more precision (on systems where @code{long
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double} is a separate type).
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These functions are GNU extensions.
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These functions have been GNU extensions and are new to @w{ISO C 9x}.
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@end deftypefun
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@comment stdlib.h
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@ -781,7 +781,7 @@ The preferred date and time representation for the current locale.
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The century of the year. This is equivalent to the greatest integer not
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greater than the year divided by 100.
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This format is a POSIX.2 extension.
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This format is a POSIX.2 extension and also appears in @w{ISO C99}.
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@item %d
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The day of the month as a decimal number (range @code{01} through @code{31}).
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@ -789,19 +789,19 @@ The day of the month as a decimal number (range @code{01} through @code{31}).
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@item %D
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The date using the format @code{%m/%d/%y}.
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This format is a POSIX.2 extension.
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This format is a POSIX.2 extension and also appears in @w{ISO C99}.
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@item %e
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The day of the month like with @code{%d}, but padded with blank (range
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@code{ 1} through @code{31}).
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This format is a POSIX.2 extension.
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This format is a POSIX.2 extension and also appears in @w{ISO C99}.
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@item %F
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The date using the format @code{%Y-%m-%d}. This is the form specified
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in the @w{ISO 8601} standard and is the preferred form for all uses.
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This format is a @w{ISO C 9X} extension.
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This format is a @w{ISO C99} extension.
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@item %g
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The year corresponding to the ISO week number, but without the century
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@ -809,7 +809,7 @@ The year corresponding to the ISO week number, but without the century
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as @code{%y}, except that if the ISO week number (see @code{%V}) belongs
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to the previous or next year, that year is used instead.
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This format is a GNU extension.
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This format was introduced in @w{ISO C99}.
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@item %G
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The year corresponding to the ISO week number. This has the same format
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@ -817,13 +817,14 @@ and value as @code{%Y}, except that if the ISO week number (see
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@code{%V}) belongs to the previous or next year, that year is used
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instead.
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This format is a GNU extension.
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This format was introduced in @w{ISO C99} but was previously available
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as a GNU extension.
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@item %h
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The abbreviated month name according to the current locale. The action
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is the same as for @code{%b}.
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This format is a POSIX.2 extension.
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This format is a POSIX.2 extension and also appears in @w{ISO C99}.
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@item %H
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The hour as a decimal number, using a 24-hour clock (range @code{00} through
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@ -857,7 +858,7 @@ The minute as a decimal number (range @code{00} through @code{59}).
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@item %n
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A single @samp{\n} (newline) character.
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This format is a POSIX.2 extension.
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This format is a POSIX.2 extension and also appears in @w{ISO C99}.
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@item %p
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Either @samp{AM} or @samp{PM}, according to the given time value; or the
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@ -873,17 +874,19 @@ Either @samp{am} or @samp{pm}, according to the given time value; or the
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corresponding strings for the current locale, printed in lowercase
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characters. Noon is treated as @samp{pm} and midnight as @samp{am}.
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This format is a GNU extension.
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This format was introduced in @w{ISO C99} but was previously available
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as a GNU extension.
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@item %r
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The complete time using the AM/PM format of the current locale.
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This format is a POSIX.2 extension.
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This format is a POSIX.2 extension and also appears in @w{ISO C99}.
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@item %R
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The hour and minute in decimal numbers using the format @code{%H:%M}.
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This format is a GNU extension.
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This format was introduced in @w{ISO C99} but was previously available
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as a GNU extension.
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@item %s
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The number of seconds since the epoch, i.e., since 1970-01-01 00:00:00 UTC.
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@ -897,7 +900,7 @@ The seconds as a decimal number (range @code{00} through @code{60}).
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@item %t
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A single @samp{\t} (tabulator) character.
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This format is a POSIX.2 extension.
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This format is a POSIX.2 extension and also appears in @w{ISO C99}.
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@item %T
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The time using decimal numbers using the format @code{%H:%M:%S}.
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@ -908,7 +911,7 @@ This format is a POSIX.2 extension.
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The day of the week as a decimal number (range @code{1} through
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@code{7}), Monday being @code{1}.
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This format is a POSIX.2 extension.
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This format is a POSIX.2 extension and also appears in @w{ISO C99}.
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@item %U
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The week number of the current year as a decimal number (range @code{00}
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@ -927,7 +930,7 @@ The week before week @code{01} of a year is the last week (@code{52} or
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@code{53}) of the previous year even if it contains days from the new
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year.
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This format is a POSIX.2 extension.
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This format is a POSIX.2 extension and also appears in @w{ISO C99}.
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@item %w
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The day of the week as a decimal number (range @code{0} through
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@ -959,7 +962,8 @@ before the year @code{1} are numbered @code{0}, @code{-1}, and so on.
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@code{-0600} or @code{+0100}), or nothing if no time zone is
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determinable.
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This format is a GNU extension.
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This format was introduced in @w{ISO C99} but was previously available
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as a GNU extension.
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A full @w{RFC 822} timestamp is generated by the format
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@w{@samp{"%a, %d %b %Y %H:%M:%S %z"}} (or the equivalent
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103
sysdeps/unix/sysv/linux/ifreq.h
Normal file
103
sysdeps/unix/sysv/linux/ifreq.h
Normal file
@ -0,0 +1,103 @@
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/* Copyright (C) 1999 Free Software Foundation, Inc.
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Contributed by Andreas Jaeger <aj@suse.de>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <net/if.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include "kernel-features.h"
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/* Variable to signal whether SIOCGIFCONF is not available. */
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#if __ASSUME_SIOCGIFNAME == 0
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static int old_siocgifconf;
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#else
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# define old_siocgifconf 0
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#endif
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static inline void
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__ifreq (struct ifreq **ifreqs, int *num_ifs)
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{
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int fd = __opensock ();
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struct ifconf ifc;
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int rq_len;
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int nifs;
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# define RQ_IFS 4
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if (fd < 0)
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{
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*num_ifs = 0;
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*ifreqs = NULL;
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return;
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}
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ifc.ifc_buf = NULL;
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/* We may be able to get the needed buffer size directly, rather than
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guessing. */
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if (! old_siocgifconf)
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{
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ifc.ifc_buf = NULL;
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ifc.ifc_len = 0;
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if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0 || ifc.ifc_len == 0)
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{
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# if __ASSUME_SIOCGIFNAME == 0
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old_siocgifconf = 1;
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# endif
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rq_len = RQ_IFS * sizeof (struct ifreq);
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}
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else
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rq_len = ifc.ifc_len;
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}
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else
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rq_len = RQ_IFS * sizeof (struct ifreq);
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/* Read all the interfaces out of the kernel. */
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do
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{
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ifc.ifc_len = rq_len;
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ifc.ifc_buf = realloc (ifc.ifc_buf, ifc.ifc_len);
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if (ifc.ifc_buf == NULL || __ioctl (fd, SIOCGIFCONF, &ifc) < 0)
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{
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if (ifc.ifc_buf)
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free (ifc.ifc_buf);
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__close (fd);
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*num_ifs = 0;
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*ifreqs = NULL;
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return;
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}
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rq_len *= 2;
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}
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while (ifc.ifc_len == rq_len && old_siocgifconf);
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nifs = ifc.ifc_len / sizeof (struct ifreq);
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__close (fd);
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*num_ifs = nifs;
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*ifreqs = realloc (ifc.ifc_buf, nifs * sizeof (struct ifreq));
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}
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static inline void
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__if_freereq (struct ifreq *ifreqs)
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{
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free (ifreqs);
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}
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