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authorUlrich Drepper <drepper@redhat.com>1997-02-25 05:18:05 +0000
committerUlrich Drepper <drepper@redhat.com>1997-02-25 05:18:05 +0000
commit2f6d1f1be920d156768f7fa17957c782c770ed36 (patch)
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update from main archive 970225cvs/libc-970225
1997-02-24 23:05 Wolfram Gloger <wmglo@dent.med.uni-muenchen.de> * malloc/malloc.c (malloc_get_state): New function. Saves global malloc state to an opaque data structure which is dynamically allocated in the heap. * malloc/malloc.c (malloc_set_state): New function. Restore previously obtained state. * malloc/malloc.h: Add declaration of malloc_get_state() and malloc_set_state(). 1997-02-24 23:27 Ulrich Drepper <drepper@cygnus.com> * sysdeps/libm-ieee754/s_cbrtl.c: Shift B1_EXP value to right position. 1997-02-24 17:38 Ulrich Drepper <drepper@cygnus.com> * misc/error.c: Make error and error_at_line weak aliases of __error and __error_at_line respectively. Suggested by David Mosberger-Tang <davidm@AZStarNet.COM>. * sysdeps/unix/sysv/linux/i386/socket.S: Update copyright. 1997-02-22 11:30 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * elf/ldd.bash.in: Run the program directly, not as argument to the dynamic linker, if it contains an interpreter segment. * elf/ldd.sh.in: Likewise. * elf/rtld.c (dl_main): In verify mode check whether the dynamic object contains an interpreter segment and exit with 2 if not. 1997-02-23 01:23 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * Makefile (distribute): Remove nsswitch.h, netgroup.h, mcheck.h and xlocale.h. Make-dist adds them automagically. 1997-02-22 12:25 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * locale/C-time.c (_nl_C_LC_TIME): Add missing entry for time-era-num-entries. 1997-02-06 13:49 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * rellns-sh: No need to check for existance of first parameter. 1997-02-24 15:20 Jonathan T. Agnew <jtagnew@amherst.edu> * glibcbug.in: Don't mention destination on MAIL_AGENT command line to avoid duplicate mail. 1997-02-24 03:51 Ulrich Drepper <drepper@cygnus.com> * Makefile (distribute): Add isomac.c. (tests): Run isomac test. * features.h (__USE_ISOC9X): New macro. * catgets/catgets.c: Don't use global variable `optind'. Instead use result computed by argp_parse. * db/makedb: Likewise. * locale/programs/locale.c: Likewise. * locale/programs/localedef.c: Likewise. * libio/stdio.h: Rewrite. Make it more readable and add comments. * libio/clearerr.c: Remove clearerr_locked alias. * libio/feof.c: Remove feof_locked alias. * libio/ferror.c: Remove feof_locked alias. * libio/fileno.c: Remove fileno_locked alias. * libio/fputc.c: Remove fputc_locked alias. * libio/getc.c: Remove getc_locked alias. * libio/getchar.c: Remove getchar_locked alias. * libio/iofflush.c: Remove fflush_locked alias. * libio/putc.c: Remove putc_locked alias. * libio/putc.c: Remove putchar_locked alias. * stdio-common/printf_fp.c: When number is inifinity print INF or inf depending on case of specifier. Same for NaN where NAN or nan is printed. Specified in ISO C 9X. * misc/sys/cdefs.h (__restrict): Define to empty string for now. * stdio/stdio.h: Add __restrict to prototypes where necessary. * libio/stdio.h: Likewise. * stdlib/stdlib.h: Likewise. * string/string.h: Likewise. * time/time.h: Likewise. * wcsmbs/wchar.h: Likewise. * stdlib/strtod.c: Change to recognize INF, INFINITY, NAN, and NAN(...). * sysdeps/ieee754/huge_val.h: Define HUGE_VALF and HUGE_VALL instead of HUGE_VALf and HUGE_VALL. * stdlib/strtof.c (FLOAT_HUGE_VAL): Use standard name HUGE_VALF instead of HUGE_VALf. * wcsmbs/wcstof.c: Likewise. * stdlib/strtold.c (FLOAT_HUGE_VAL): Use standard name HUGE_VALL instead of HUGE_VALl. * wcsmbs/wcstold.c: Likewise. * sysdeps/posix/gai_strerror.c: Use size_t for counter variable to avoid warning. * wcsmbs/Makefile (routines): Add wcscasecmp and wcsncase. * wcsmbs/wchar.h: Add prototypes for wcscasecmp and wcsncase. * wcsmbs/wcscasecmp.c: New file. * wcsmbs/wcsncase.c: New file. * stdlib/strtol.c: Define wide character quad word functions as wcstoll and wcstoull and normal versions as strtoll and strtoull. * wcsmbs/wchar.h: Add prototypes for wcstoll and wcstoull. * wcsmbs/wcstoq: Renamed to wcstoll.c. * wcsmbs/wcstouq: Renamed to wcstoull.c. * wcsmbs/wcstoll.c: Renamed from wcstoq.c. Make wcstoq a weak alias of wcstoll. * wcsmbs/wcstoull.c: Renamed from wcstouq.c. Make wcstouq a weak alias of wcstoull. * wcsmbs/Makefile (routines): Replace wcstoq and wcstouq by wcstoll and wcstoull respectively. * stdlib/strtoq.c: Rename to strtoll.c. * stdlib/strtouq.c: Rename to strtoull.c. * stdlib/strtoll.c: Renamed from strtoq.c. Make strtoq a weak alias of strtoll. * stdlib/strtoll.c: Renamed from strtouq.c. Make strtouq a weak alias of strtoull. * stdlib/Makefile (routines): Replace strtoq and strtouq by strtoll and strtoull respectively. * stdio-common/vfscanf.c: Don't use __strtoq_internal and __strtouq_internal but instead __strtoll_internal and __strtoull_internal respectively. * stdlib/stdlib.h (strtoq): Use __internal_strtoll in inline version. (strtouq): Similar with __internal_strtoull. * wcsmbs/wchar.h (wcstoq): Use __internal_wcstoll in inline version. (wcstouq): Similar with __internal_wcstoull. 1997-02-23 04:38 Ulrich Drepper <drepper@cygnus.com> * stdlib/strtol.c (STRTOL): It is not illegal to parse a minus sign in the strtouXX functions. The results gets simply negated. * stdio-common/tstscanf.c: Add testcase for above case. * stdlib/tst-strtol.c: Correct tests. * manual/stdio-fp.c: New file. Generate output for example program in stdio.texi. * stdio-common/Makefile (routines): Add printf_fphex. * stdio-common/vfprintf.c: Add handling of %a and %A specifier. * stdio-common/printf_fphex.c: New file. Implement %a and %A specifier. 1997-02-22 03:01 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/timebits.h (CLK_TCK): Don't defined if __STRICT_ANSI__. * math/math.h: Prevent definition of struct exception when using C++. 1997-02-22 01:45 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/syscalls.list: Dup takes only one argument. Reported by Greg McGary. 1997-02-21 00:22 Miles Bader <miles@gnu.ai.mit.edu> 1997-02-20 01:28 Miles Bader <miles@gnu.ai.mit.edu> 1997-02-19 13:56 Miles Bader <miles@gnu.ai.mit.edu> 1997-02-18 15:39 Miles Bader <miles@gnu.ai.mit.edu> 1997-02-17 10:58 Miles Bader <miles@gnu.ai.mit.edu> 1997-02-15 10:23 Miles Bader <miles@gnu.ai.mit.edu> (mutex_lock, mutex_unlock, mutex_trylock): Defined in terms of __mutex_*. (mutex_t): Type removed & replaced by new macro. (tsd_key_t): Typedef to int instead of pthread_key_t. (tsd_key_create, tsd_setspecific, tsd_getspecific): New macros. (__pthread_initialize): New macro, work around assumption of pthreads. * sysdeps/mach/hurd/i386/init-first.c (__libc_argv, __libc_argc): __hurd_sigthread_stack_end, __hurd_sigthread_stack_variables, __hurd_threadvar_max, __hurd_threadvar_stack_offset, __hurd_threadvar_stack_mask): Variables removed. 1997-02-14 14:07 Miles Bader <miles@gnu.ai.mit.edu> * hurd/hurd.h (_hurd_pids_changed_stamp, _hurd_pids_changed_sync): 1997-02-24 17:06 Geoffrey Keating <geoffk@discus.anu.edu.au> * sysdeps/unix/sysv/linux/accept.S (NARGS): Describe number of arguments taken, for sysdeps/unix/sysv/linux/powerpc/socket.S. * sysdeps/unix/sysv/linux/bind.S: Likewise. * sysdeps/unix/sysv/linux/connect.S: Likewise. * sysdeps/unix/sysv/linux/getpeername.S: Likewise. * sysdeps/unix/sysv/linux/getsockname.S: Likewise. * sysdeps/unix/sysv/linux/getsockopt.S: Likewise. * sysdeps/unix/sysv/linux/listen.S: Likewise. * sysdeps/unix/sysv/linux/recv.S: Likewise. * sysdeps/unix/sysv/linux/recvfrom.S: Likewise. * sysdeps/unix/sysv/linux/recvmsg.S: Likewise. * sysdeps/unix/sysv/linux/send.S: Likewise. * sysdeps/unix/sysv/linux/sendmsg.S: Likewise. * sysdeps/unix/sysv/linux/sendto.S: Likewise. * sysdeps/unix/sysv/linux/setsockopt.S: Likewise. * sysdeps/unix/sysv/linux/shutdown.S: Likewise. * sysdeps/unix/sysv/linux/socketpair.S: Likewise. 1997-02-15 04:51 Ulrich Drepper <drepper@cygnus.com>
Diffstat (limited to 'manual')
-rw-r--r--manual/stdio-fp.c28
-rw-r--r--manual/stdio.texi55
2 files changed, 73 insertions, 10 deletions
diff --git a/manual/stdio-fp.c b/manual/stdio-fp.c
new file mode 100644
index 0000000000..db9480782d
--- /dev/null
+++ b/manual/stdio-fp.c
@@ -0,0 +1,28 @@
+/* This program is to generate one of the examples in stdio.texi. */
+
+#include <stdio.h>
+
+
+static void
+print (double v)
+{
+ printf ("|%13.4a|%13.4f|%13.4e|%13.4g|\n", v, v, v, v);
+}
+
+
+int
+main (void)
+{
+ print (0.0);
+ print (0.5);
+ print (1.0);
+ print (-1.0);
+ print (100.0);
+ print (1000.0);
+ print (10000.0);
+ print (12345.0);
+ print (100000.0);
+ print (123456.0);
+
+ return 0;
+}
diff --git a/manual/stdio.texi b/manual/stdio.texi
index e922fd17d8..04c635b054 100644
--- a/manual/stdio.texi
+++ b/manual/stdio.texi
@@ -1007,6 +1007,12 @@ whichever is more appropriate for its magnitude. @samp{%g} uses
lower-case letters and @samp{%G} uses upper-case. @xref{Floating-Point
Conversions}, for details.
+@item @samp{%a}, @samp{%A}
+Print a floating-point number in a hexadecimal fractional notation which
+the exponent to base 2 represented in decimal digits. @samp{%a} uses
+lower-case letters and @samp{%A} uses upper-case. @xref{Floating-Point
+Conversions}, for details.
+
@item @samp{%c}
Print a single character. @xref{Other Output Conversions}.
@@ -1194,6 +1200,34 @@ than -4 or greater than or equal to the precision; otherwise they use the
of the result and a decimal-point character appears only if it is
followed by a digit.
+The @samp{%a} and @samp{%A} conversions are meant for representing
+floating-point number exactly in textual form so that they can be
+exchanged as texts between different programs and/or machines. The
+numbers are represented is the form
+@w{[@code{-}]@code{0x}@var{h}@code{.}@var{hhh}@code{p}[@code{+}|@code{-}]@var{dd}}.
+At the left of the decimal-point character exactly one digit is print.
+This character is only @code{0} is the number is denormalized.
+Otherwise the value is unspecifed; it is implemention dependent how many
+bits are used. The number of hexadecimal digits on the right side of
+the decimal-point character is equal to the precision. If the precision
+is zero it is determined to be large enough to provide an exact
+representation of the number (or it is large enough to distinguish two
+adjacent values if the @code{FLT_RADIX} is not a power of 2,
+@pxref{Floating Point Parameters}) For the @samp{%a} conversion
+lower-case characters are used to represent the hexadecimal number and
+the prefix and exponent sign are printed as @code{0x} and @code{p}
+respectively. Otherwise upper-case characters are used and @code{0X}
+and @code{P} are used for the representation of prefix and exponent
+string. The exponent to the base of two is printed as a decimal number
+using at least one digit but at most as many digits as necessary to
+represent the value exactly.
+
+If the value to be printed represents infinity or a NaN, the output is
+@w{[@code{-}]@code{inf}} or @code{nan} respectively if the conversion
+specifier is @samp{%a}, @samp{%e}, @samp{%f}, or @samp{%g} and it is
+@w{[@code{-}]@code{INF}} or @code{NAN} respectively if the conversion is
+@samp{%A}, @samp{%E}, or @samp{%G}.
+
The following flags can be used to modify the behavior:
@comment We use @asis instead of @samp so we can have ` ' as an item.
@@ -1255,21 +1289,22 @@ floating-point conversions. All of the numbers were printed using
this template string:
@smallexample
-"|%12.4f|%12.4e|%12.4g|\n"
+"|%13.4a|%13.4f|%13.4e|%13.4g|\n"
@end smallexample
Here is the output:
@smallexample
-| 0.0000| 0.0000e+00| 0|
-| 1.0000| 1.0000e+00| 1|
-| -1.0000| -1.0000e+00| -1|
-| 100.0000| 1.0000e+02| 100|
-| 1000.0000| 1.0000e+03| 1000|
-| 10000.0000| 1.0000e+04| 1e+04|
-| 12345.0000| 1.2345e+04| 1.234e+04|
-| 100000.0000| 1.0000e+05| 1e+05|
-| 123456.0000| 1.2346e+05| 1.234e+05|
+| 0x0.0000p+0| 0.0000| 0.0000e+00| 0|
+| 0x1.0000p-1| 0.5000| 5.0000e-01| 0.5|
+| 0x1.0000p+0| 1.0000| 1.0000e+00| 1|
+| -0x1.0000p+0| -1.0000| -1.0000e+00| -1|
+| 0x1.9000p+6| 100.0000| 1.0000e+02| 100|
+| 0x1.f400p+9| 1000.0000| 1.0000e+03| 1000|
+| 0x1.3880p+13| 10000.0000| 1.0000e+04| 1e+04|
+| 0x1.81c8p+13| 12345.0000| 1.2345e+04| 1.234e+04|
+| 0x1.86a0p+16| 100000.0000| 1.0000e+05| 1e+05|
+| 0x1.e240p+16| 123456.0000| 1.2346e+05| 1.235e+05|
@end smallexample
Notice how the @samp{%g} conversion drops trailing zeros.