diff options
| -rw-r--r-- | ChangeLog | 14 | ||||
| -rw-r--r-- | manual/arith.texi | 26 | ||||
| -rw-r--r-- | manual/time.texi | 34 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/ifreq.h | 103 |
4 files changed, 159 insertions, 18 deletions
@@ -1,3 +1,17 @@ +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. + 1999-10-29 Ulrich Drepper <drepper@cygnus.com> * manual/math.texi (Errors in Math Functions): New section. diff --git a/manual/arith.texi b/manual/arith.texi index 1a24beb7ca..11479d618b 100644 --- a/manual/arith.texi +++ b/manual/arith.texi @@ -2101,6 +2101,10 @@ are whitespace is determined by the @code{isspace} function @item An optional plus or minus sign (@samp{+} or @samp{-}). +@item A floating point number in decimal or hexadecimal format. The +decimal format is: +@itemize @minus + @item A nonempty sequence of digits optionally containing a decimal-point character---normally @samp{.}, but it depends on the locale @@ -2110,6 +2114,22 @@ character---normally @samp{.}, but it depends on the locale An optional exponent part, consisting of a character @samp{e} or @samp{E}, an optional sign, and a sequence of digits. +@end itemize + +The hexadecimal format is as follows: +@itemize @minus + +@item +A 0x or 0X followed by a nonempty sequence of hexadecimal digits +optionally containing a decimal-point character---normally @samp{.}, but +it depends on the locale (@pxref{General Numeric}). + +@item +An optional binary-exponent part, consisting of a character @samp{p} or +@samp{P}, an optional sign, and a sequence of digits. + +@end itemize + @item Any remaining characters in the string. If @var{tailptr} is not a null pointer, a pointer to this tail of the string is stored in @@ -2146,10 +2166,10 @@ examining @var{errno} and @var{tailptr}. @end deftypefun @comment stdlib.h -@comment GNU +@comment ISO C @deftypefun float strtof (const char *@var{string}, char **@var{tailptr}) @comment stdlib.h -@comment GNU +@comment ISO C @deftypefunx {long double} strtold (const char *@var{string}, char **@var{tailptr}) These functions are analogous to @code{strtod}, but return @code{float} and @code{long double} values respectively. They report errors in the @@ -2158,7 +2178,7 @@ than @code{strtod}, but has less precision; conversely, @code{strtold} can be much slower but has more precision (on systems where @code{long double} is a separate type). -These functions are GNU extensions. +These functions have been GNU extensions and are new to @w{ISO C 9x}. @end deftypefun @comment stdlib.h diff --git a/manual/time.texi b/manual/time.texi index 852df4355b..8d79a25ef1 100644 --- a/manual/time.texi +++ b/manual/time.texi @@ -781,7 +781,7 @@ The preferred date and time representation for the current locale. The century of the year. This is equivalent to the greatest integer not greater than the year divided by 100. -This format is a POSIX.2 extension. +This format is a POSIX.2 extension and also appears in @w{ISO C99}. @item %d The day of the month as a decimal number (range @code{01} through @code{31}). @@ -789,19 +789,19 @@ The day of the month as a decimal number (range @code{01} through @code{31}). @item %D The date using the format @code{%m/%d/%y}. -This format is a POSIX.2 extension. +This format is a POSIX.2 extension and also appears in @w{ISO C99}. @item %e The day of the month like with @code{%d}, but padded with blank (range @code{ 1} through @code{31}). -This format is a POSIX.2 extension. +This format is a POSIX.2 extension and also appears in @w{ISO C99}. @item %F The date using the format @code{%Y-%m-%d}. This is the form specified in the @w{ISO 8601} standard and is the preferred form for all uses. -This format is a @w{ISO C 9X} extension. +This format is a @w{ISO C99} extension. @item %g The year corresponding to the ISO week number, but without the century @@ -809,7 +809,7 @@ The year corresponding to the ISO week number, but without the century as @code{%y}, except that if the ISO week number (see @code{%V}) belongs to the previous or next year, that year is used instead. -This format is a GNU extension. +This format was introduced in @w{ISO C99}. @item %G The year corresponding to the ISO week number. This has the same format @@ -817,13 +817,14 @@ and value as @code{%Y}, except that if the ISO week number (see @code{%V}) belongs to the previous or next year, that year is used instead. -This format is a GNU extension. +This format was introduced in @w{ISO C99} but was previously available +as a GNU extension. @item %h The abbreviated month name according to the current locale. The action is the same as for @code{%b}. -This format is a POSIX.2 extension. +This format is a POSIX.2 extension and also appears in @w{ISO C99}. @item %H The hour as a decimal number, using a 24-hour clock (range @code{00} through @@ -857,7 +858,7 @@ The minute as a decimal number (range @code{00} through @code{59}). @item %n A single @samp{\n} (newline) character. -This format is a POSIX.2 extension. +This format is a POSIX.2 extension and also appears in @w{ISO C99}. @item %p Either @samp{AM} or @samp{PM}, according to the given time value; or the @@ -873,17 +874,19 @@ Either @samp{am} or @samp{pm}, according to the given time value; or the corresponding strings for the current locale, printed in lowercase characters. Noon is treated as @samp{pm} and midnight as @samp{am}. -This format is a GNU extension. +This format was introduced in @w{ISO C99} but was previously available +as a GNU extension. @item %r The complete time using the AM/PM format of the current locale. -This format is a POSIX.2 extension. +This format is a POSIX.2 extension and also appears in @w{ISO C99}. @item %R The hour and minute in decimal numbers using the format @code{%H:%M}. -This format is a GNU extension. +This format was introduced in @w{ISO C99} but was previously available +as a GNU extension. @item %s The number of seconds since the epoch, i.e., since 1970-01-01 00:00:00 UTC. @@ -897,7 +900,7 @@ The seconds as a decimal number (range @code{00} through @code{60}). @item %t A single @samp{\t} (tabulator) character. -This format is a POSIX.2 extension. +This format is a POSIX.2 extension and also appears in @w{ISO C99}. @item %T The time using decimal numbers using the format @code{%H:%M:%S}. @@ -908,7 +911,7 @@ This format is a POSIX.2 extension. The day of the week as a decimal number (range @code{1} through @code{7}), Monday being @code{1}. -This format is a POSIX.2 extension. +This format is a POSIX.2 extension and also appears in @w{ISO C99}. @item %U The week number of the current year as a decimal number (range @code{00} @@ -927,7 +930,7 @@ The week before week @code{01} of a year is the last week (@code{52} or @code{53}) of the previous year even if it contains days from the new year. -This format is a POSIX.2 extension. +This format is a POSIX.2 extension and also appears in @w{ISO C99}. @item %w The day of the week as a decimal number (range @code{0} through @@ -959,7 +962,8 @@ before the year @code{1} are numbered @code{0}, @code{-1}, and so on. @code{-0600} or @code{+0100}), or nothing if no time zone is determinable. -This format is a GNU extension. +This format was introduced in @w{ISO C99} but was previously available +as a GNU extension. A full @w{RFC 822} timestamp is generated by the format @w{@samp{"%a, %d %b %Y %H:%M:%S %z"}} (or the equivalent diff --git a/sysdeps/unix/sysv/linux/ifreq.h b/sysdeps/unix/sysv/linux/ifreq.h new file mode 100644 index 0000000000..8c9000551d --- /dev/null +++ b/sysdeps/unix/sysv/linux/ifreq.h @@ -0,0 +1,103 @@ +/* Copyright (C) 1999 Free Software Foundation, Inc. + Contributed by Andreas Jaeger <aj@suse.de>. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <net/if.h> +#include <sys/socket.h> +#include <sys/ioctl.h> +#include "kernel-features.h" + +/* Variable to signal whether SIOCGIFCONF is not available. */ +#if __ASSUME_SIOCGIFNAME == 0 +static int old_siocgifconf; +#else +# define old_siocgifconf 0 +#endif + + +static inline void +__ifreq (struct ifreq **ifreqs, int *num_ifs) +{ + int fd = __opensock (); + struct ifconf ifc; + int rq_len; + int nifs; +# define RQ_IFS 4 + + if (fd < 0) + { + *num_ifs = 0; + *ifreqs = NULL; + return; + } + + ifc.ifc_buf = NULL; + + /* We may be able to get the needed buffer size directly, rather than + guessing. */ + if (! old_siocgifconf) + { + ifc.ifc_buf = NULL; + ifc.ifc_len = 0; + if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0 || ifc.ifc_len == 0) + { +# if __ASSUME_SIOCGIFNAME == 0 + old_siocgifconf = 1; +# endif + rq_len = RQ_IFS * sizeof (struct ifreq); + } + else + rq_len = ifc.ifc_len; + } + else + rq_len = RQ_IFS * sizeof (struct ifreq); + + /* Read all the interfaces out of the kernel. */ + do + { + ifc.ifc_len = rq_len; + ifc.ifc_buf = realloc (ifc.ifc_buf, ifc.ifc_len); + if (ifc.ifc_buf == NULL || __ioctl (fd, SIOCGIFCONF, &ifc) < 0) + { + if (ifc.ifc_buf) + free (ifc.ifc_buf); + + __close (fd); + + *num_ifs = 0; + *ifreqs = NULL; + return; + } + rq_len *= 2; + } + while (ifc.ifc_len == rq_len && old_siocgifconf); + + nifs = ifc.ifc_len / sizeof (struct ifreq); + __close (fd); + + *num_ifs = nifs; + *ifreqs = realloc (ifc.ifc_buf, nifs * sizeof (struct ifreq)); +} + +static inline void +__if_freereq (struct ifreq *ifreqs) +{ + free (ifreqs); +} |