Message-Id: <200811091641.mA9Gf3EG027562@delorie.com> X-Recipient: djgpp-announce AT delorie DOT com X-Authenticated: #27081556 X-Provags-ID: V01U2FsdGVkX18nJ38Dh+EnM755h2GMTRJbg3I79LcOTYrbq0PiwG Gsl1DhHqcGC9CL From: "Juan Manuel Guerrero" To: Subject: ANNOUNCE: libsupp 6.0 for DJGPP 2.03 and 2.04 uploaded. Date: Sun, 9 Nov 2008 16:24:27 +0100 X-Priority: 3 X-MSMail-Priority: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Y-GMX-Trusted: 0 X-FuHaFi: 0.5 This is libsupp 6.0 for MSDOS/DJGPP. Introduction. ============= This is a support library for DJGPP 2.04 and 2.03. It shall provide a small set of new functions that still have not been implemented for DJGPP or improved versions of functions from DJGPP's CVS source repository so that the original functions provided with DJGPP's libc.a (2.04 and 2.03) can be replaced with these new ones. The decision which function is part and which one is not part of this library is based on the usefullnes for porting current GNU packages. If the amount of provided functions increases in the future will depend on the requirements of the GNU packages to be ported. The following function: strftime() has been modified to improve the compatibility with ANSI/POSIX and the GNU glibc. The following functions have been implemented: towlower() mbsinit() mbrtowc() memmem() strlcat() strlcpy() 1) In the current DJGPP's cvs version of strftime the following conversion specifiers are missed and have been implemented: %F, %G, %g and %V. They all concern the year, week and date representation according to ISO 8601:2000. A comparision with GNU libc shows that also the %P and %s specifiers must be implemented. The %s specifier computes the seconds since 1970-01-01 using mktime(). Also the modifiers E and O have been implemented. These flags are ignored because DJGPP's implementation of strftime only supports the C/POSIX locale. Also the GNU specific # flag, that changes the case for certain conversion specifiers has been implemented. The parsing of the format string now allows any order of the flags. 2) towlower() is a wrapper to tolower(). If the wchar is less than 0xFF, it is passed to tolower, else it is returned unaltered. It is implemented to ease porting efforts. 3) mbsinit() is implemented for easing porting efforts. 4) mbrtowc() is a wrapper to mbtowc with the goal to ease porting efforts. The wrapper does not provide any reentrant capability. 5) memmem() is a GNU compatibility function to ease porting efforts. 6) strlcat() and strlcpy() are replacement versions of the functions that are part of DJGPP's libc. These routines have been deliberately designed to not require any assistance from the standard libraries. They have been coded and contributed by C.B. Falconer. The original archive that includes the original BSD documentation can be downloaded as: If you prefer to use the versions of these functions that come with libc.a, then use the macro USE_DJGPP_STRL_FCTNS like this: gcc -DUSE_DJGPP_STRL_FCTNS -O2 -c code.c or define it in your source file before including libsupp.h: #define USE_DJGPP_STRL_FCTNS #include If USE_DJGPP_STRL_FCTNS is not defined always the libsupp versions will be used. It should be noticed that none of the functions concerning multibyte and reentrancy issues improves the DJGPP capability beyond the existing one. All these functions are only wrappers to allow to port certain GNU programs that expect that these functions are available. The following functions have already been provided in previous versions of this library: access() __chdir() _fixpath() __canonicalize_path() realpath() lstat() only for 2.04 stat() only for 2.03 symlink() only for 2.03 opendir() readdir() rewinddir() __set_need_fake_dot_dotdot() open() close() fchdir() strndup() strnlen() argz_add() argz_add_sep() argz_append() argz_count() argz_create() argz_createsep() argz_delete() argz_extract() argz_insert() argz_next() argz_replace() argz_stringify() strtod() strtof() strtold() signbit() __signbitd() __signbitf() __signbitld() asnprintf() asprintf() cprintf() fprintf() fseeko() ftello() printf() snprintf() sprintf() vasnprintf() vasprintf() vfprintf() vprintf() vsnprntf() vsprintf() _doprnt() Version 5.3: ============ This is a bug fix release. One issue has been fixed in function: __canonicalize_path __canonicalize_path, that is used by realpath and _fixpath, will no longer set errno to ENOSYS to signal that the used OS does not provide a LFN API. This value of errno does not reflect the result of the operation performed to canonicalize the given path and will confuse the calling function of realpath or _fixpath. This bug appears in both versions of libc.a, the one of djdev204 and the one of djdev203. Version 5.2: ============ This is a bug fix release. Two issues have been fixed in function: __get_current_directory 1) Apart from upper case drive specifier characters, now lower case drive specifier characters will also be recognized as valid drive specifiers. 2) For WinNT/2K/XP with LFN enabled if the CWD is the root directory, a malformed path string is returned as canonicalized path by _fixpath and realpath. For example if the path string "foo/bar" was passed as argument to _fixpath, "C:\/foo/bar" will be returned, assuming that CWD is "c:/". Please note the backslash after the drive specifier. This bug appears in both versions of libc.a, the one of djdev204 and the one of djdev203. __get_current_directory() is an internal function of __canonicalize_path() that is used by _fixpath, realpath, lstat and some others file system functions. This implies that this version of libsupp will provide all functions that depend of the patched function to replace their original versions of libc.a. These are: access() __chdir() _fixpath() __canonicalize_path() realpath() lstat() only for 2.04 stat() only for 2.03 symlink() only for 2.03 Depending of the value of __DJGPP_MINOR__ ones or the other ones will be available. Version 5.1: ============ The following function was wrong implemented and has been fixed accordingly: strndup() and the missed function: closedir() has been added. A new fix provided by Andris Pavenis for ieeefp.h has been applied. Also a bug fix in the symlink supporting code in readdir has been added. This fix resolves a problem where every 510 byte long file that is not a symlink sets errno to EINVAL. Now the original errno is preserved. Version 5.0: ============ The following functions have been modified to fix a bug. opendir() readdir() rewinddir() __set_need_fake_dot_dotdot() The bug is in the code segment of readdir() that handles the symlink files and thus is only triggerd if the file is a symlink. The reason for the bug is the different assumption about what should be the content of member string "name" in the "DIR" structure. In the version fixed by me, the containt of "name" will be the canonicalized path as returned by _fixpath() with an appended slash. In the original version, there was a "*.*" string appended to the end of the member string "name" in the "DIR" structure. If this is forgotten and a new string is appended to the end of "name", then a useless dir name string is produced that makes fail all functions that use it. E.G.: dir->name = "c:/foo/bar/*.*" as it may be produced by opendir(). The symlink code in readdir() tries to append the name of the link file (e.g.: link.txt) and produces the new DIR structure member: dir->name = "c:/foo/bar/*.*/link.txt" that is not a valid path string. The function versions of djdev203 have the same "malformed" path in "name" but because they have not the symlink code, they do not need to be modified. This means, that only if you compile your application with djdev204.zip, the above mentioned functions in djdev204 will be replaced by the ones provided by this version of libsupp. To ease the porting of POSIX centric source code for people still using djdev203, the following functions are provided: open() close() fchdir() These functions have been taken from the CVS reporitory and the whole symlink support has been removed. The goal is to have the necessary POSIX support available to open directories using fchdir(). Because the symlink support has been completely removed, the mode bits O_NOLINK and O_NOFOLLOW will be ignored. These functions are only intended to be used with djdev203 and will only be available if __DJGPP_MINOR__ is equal '3'. Version 4.0: ============ The strndup() and strnlen() functions have been implemented to improve compatibility with GNU glibc. Version 3.0: ============ The argz functions store strings in a contiguous chunk of memory using '\0' as separator token. They are GNU extensions to glibc and have been implemented to make porting easier. The strto[dfld] functions now support the conversion of the hex format strings like this: "0xh.hhhhP[+|-]ddd" into variables of the type float, double and long double. Version 2.0: ============ signbit returns 0 if the sign of the mantissa of a floating point number is positive; if the sign is negative it returns non-zero. __signbit[dfld] are the internal implementations and should not be called except through the macro signbit. fseeko() and ftello() are wrappers for fseek() and ftell(). Version 1.0: ============ Apart from the features already provided by the familiy of printf() functions from djdev204, this version of the functions will provide: 1: Flags. ': This flag allows to format the integer part with the thousands' character. Because DJGPP only offers C/POSIX locale and this do not define a thousands' character the flag is ignored. 2: Length modifiers. DJGPP provides all of them. 3: Conversion specifiers. %F: 'F' Has been added and works like 'f'. %[aA]: With this conversion specifier a floating point number will be converted in the style "[-]0xh.hhhhp[-]d", where h are hexadecimal digits, p stands for the power of 2 and d is exponent expressed in decimal digits. %a prints lower case characters and %A prints upper case characters. %n$: This implementation of printf family of functions also supports *n$ numbered conversion specifiers (%n$ for defining the position of the argument to be printed in the argument list, and *n$ for defining the position of the field width and precision to be used in the argument list). 4: To increase compatibility with glibc's printf, _doprnt() has been changed to return for 80 bit floating point numbers starting with 0 integer bit and non-zero exponent (Pseudo-NaN, Pseudo-Infinity, Pseudo-Zero and denormalized numbers (unnormal)) "nan" or "NAN" instead of "Unnormal" as used to be. This may break backward compatibility but makes it easier to port GNU programs. To be able to use the new functions you will have to include the header (libsupp.h) in your source code. This header will provide the macros to map the conventional function names to their real library names. All library names start with the prefix "libsupp_". E.g.: printf --> libsupp_printf If you still use djdev203 then the header will also provide the data types definitions for intmax_t and uintmax_t. The definitios have been taken from stdint.h and I have not been able to figure out a way to check if your code already provides a definition of these data types, so these are always defined and this may trigger warnings or errors when your code is compiled. If this happens it will be your job to fix your code. Because the provided functions depend on other libc functions, this library must be linked before the standard C library, libc.a, is linked into your programs by gcc. E.g.: gcc -Wall -O2 prog.c -lsupp The /diffs directory contains two patches that documents the changes I have done. The diffs-cvs patch shows all changes I have done against the sources stored in the CVS tree as checked out on 2008-09-17. The second patch is diffs-lib and shows the changes against the *patched* checked out CVS sources that are required to create the sources of this library. It is your choice if you prefer to check out the CVS sources, patch them using diffs-cvs and build your own libc.a with the proposed new functionality or if you prefer to continue using libc.a distributed by djdev203 or djdev204 together with this library. Installation. ============= The binary package provides a header file, libsupp.h, the library file, libsupp.a, and the info docs. All this is installed in the standard places of your DJGPP installation tree. Copy the binary distribution into the top DJGPP installation directory, just unzip it preserving the directory structure running *one* of the following commands: unzip32 lsupp60a.zip or djtarx lsupp60a.zip or pkunzip -d lsupp60a.zip You must add an entry in your /info/dir file to be able to read the docs. Edit manually your /info/dir and add the following lines: >>>From lsuppNNa.zip * libsupp.a: (libsupp). The Support Library Reference Building the binaries from sources. =================================== The library can *only* be build with *djdev204*. Create a temporary directory and copy the source package into the directory. Just unzip it preserving the directory structure running *one* of the following commands: unzip32 lsupp60s.zip or djtarx lsupp60s.zip or pkunzip -d lsupp60s.zip To build the library cd into the top srcdir and run the shell script like this: sh mklib.sh The script accepts only a single optional argument that specifies the installation directory. If it is omitted the products will be stored in the /_build_ directory created in the top srcdir. The script will build the library and the info docs; if everything is successfully build then the test program in the /tests directory is build and started. The output of the test program ist stored in /tests/test.txt for inspection. During the building of the test program a lot of warnings will appear. This is intentional to test that the compiler recognizes the new functions as functions of the type of *printf family and produces the typical warnings if flag combinations are used that are not allowed or defined. You *cannot* build the library with djdev203. If you want to run the test program with djdev203 and the library, compile it with a command like this: gcc -Wall -O2 test.c -o test.exe -lsupp start it and inspect the output stored in test.txt. The description of printf() can be found at: The description of signbit() can be found at: The description of strto[dfld]() can be found at: The description of strftime() can be found at: The library consists of two packages produced using djdev204 and can be downloaded from ftp.delorie.com and mirrors as (timestamp 2008-11-08): Libsupp 6.0 header file, library and info format documentation: ftp://ftp.delorie.com/pub/djgpp/beta/v2tk/lsupp60a.zip Libsupp 6.0 source: ftp://ftp.delorie.com/pub/djgpp/beta/v2tk/lsupp60s.zip Send suggestions and bug reports concerning the library to comp.os.msdos.djgpp or . Enjoy. Guerrero, Juan Manuel