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Annotation of dietlibc/CHANGES, revision 1.24

1.21      fefe        1: 0.7.2:
                      2:   added several prototypes to already implemented functions and
                      3:     <sys/reboot.h>.  Thanks for Abraham for pointing this out.
1.22      fefe        4:   added prototypes for process group and dup syscalls.  Thanks to
                      5:     Abraham again.  He also contributed an implementation for daemon(),
                      6:     an ugly BSD hack.  I decided to diversify the lib/ directory a
                      7:     little and now created a libugly/ directory for stuff like system()
                      8:     and daemon() ;-)
                      9:   added libstdio and moved all that stdio crap from lib/ there.  The
                     10:     idea is to start separating now what we will separate for shared
                     11:     libraries anyway.
1.21      fefe       12: 
1.9       fefe       13: 0.7.1:
1.11      fefe       14:   optimized away the static arrays from __ltostr and __lltostr.
                     15:   optimized away the static arrays (and more!) from strtoul and strtoull.
                     16:   added system (by Olaf).
1.12      fefe       17:   added tolower and toupper
1.13      fefe       18:   added getopt from Olaf (~600 bytes on x86!)
1.14      fefe       19:   added clone for mips (by Olaf).
                     20:   fixed longjmp and setjmp on sparc not to require glibc include files.
1.15      olaf       21:   added pause for all (by Olaf).
1.17      fefe       22:   added __attribute__ ((__const__)) to ctype.h
1.16      fefe       23:   added isupper and islower.
                     24:   added putc and putchar as macros.
1.17      fefe       25:   added strcasecmp and strncasecmp (thanks to Abraham vd Merwe for
                     26:     insightful discussions and patches I partially used for the last three)
1.18      fefe       27:   added getpriority and setpriority (also by Abraham)
1.19      fefe       28:   oops, I broke strtoul in a recent optimization attempt.
1.20      fefe       29:   oi, setjmp and longjmp were broken on other platforms, too!
                     30:     Thanks to Sébastien Côté for reporting this.
1.9       fefe       31: 
                     32: 0.7:
1.6       olaf       33:   clone support for i386,alpha,arm and sparc by Olaf.
1.1       cvs        34:   Initial dynamic loading glue for i386, also by Olaf.
                     35:   We don't have a dynamic loader yet, so this is not yet usable.
                     36:   added readv, sigdelset, sigaltstack, sigfillset, sigismember, usleep,
                     37:     vsprintf, writev, all by Olaf.
1.2       fefe       38:   imported readdir fix from Guillaume.  Mhh, can the kernel interface
                     39:     really be this broken?
1.3       fefe       40:   Found a kludgy way to detect whether the kernel includes define struct
                     41:     stat64 (they also define STAT64_HAS_BROKEN_ST_INO).  If this does
                     42:     not work for you, please tell me!
1.4       fefe       43:   Removed bogus __seek_types enum, it's a bunch of #defines now.
1.7       fefe       44:   Fixed stdio line buffering.  The code was already there but I forgot
                     45:     to mark stdio and stdout as line buffered.  This should really be
                     46:     done dynamically using isatty, though.
1.8       fefe       47:   Removed superfluous "if (1)" in execvp.c
1.1       cvs        48: 
                     49: 0.6.14:
                     50:   *scanf did not append the 0 byte for %s.
                     51:   added creat and changed creat to call open directly instead of open64.
                     52:   did for fread what 0.6.10 did for fwrite.
                     53:   repaired buffered stdio a little (line buffering is still not
                     54:     supported).
                     55:   [All of these bugs have been reported by Guillaume.  Thanks!]
                     56:   added __pure__ to strchr and strrchr in <string.h>
                     57: 
                     58: 0.6.13:
                     59:   included COPYING to make clear that the diet libc is covered by the
                     60:     GNU General Public License (and _not_ the LGPL).  That means that
                     61:     you need to obtain a license from me if you want to use the diet
                     62:     libc in a proprietary program that you want to distribute.
                     63:   The x86 unified syscall swapped arguments #4 and #5 and noone
                     64:     noticed until now!  Thanks to Guillaume Cottenceau for reporting
                     65:     this!
                     66:   The malloc had a subtle bug with small allocations that could cause
                     67:     segfault.  Guillaume reported it, Olaf fixed it.
                     68: 
                     69: 0.6.12:
                     70:   added assert, statfs and fstatfs
                     71:   added include/net/if.h so fget compiles again.
                     72: 
                     73: 0.6.11:
                     74:   added putenv.
                     75: 
                     76: 0.6.10:
                     77:   fixed fwrite.  It returned the number of bytes written, not the number
                     78:     of records.  Thanks to Albert D. Cahalan for pointing this out.
                     79:   fixed fgets.  It returned EOF on empty lines.  Thanks, Erik Frey.
                     80:   added brk and sbrk.  harold@nb.com.sg made me do it.
                     81: 
                     82: 0.6.9:
                     83:   fixed execvp not to return on ENOENT
                     84:   did for {open|read|close|seek|tell}dir what I did for stat before.
                     85:     The glibc compatibility part is currently non-functional.
                     86:   fixed white space handling in sscanf " (" would not match " (".
                     87:   fixed printf to accept 'l' flag.
                     88:   fixed getpwuid (ignored last line)
                     89: 
                     90: 0.6.8:
                     91:   Olaf contributed initial thread-safe syscalls for i386, alpha, sparc,
                     92:     mips and arm.  I did the one for ppc.  They can be enabled in dietfeatures.h.
                     93:   added strlcpy and strlcat from OpenBSD.
                     94:   added stat64, fstat64 and lstat64.
                     95:   added endian.h and made ending of strlen.c endianness-aware
                     96:   added string routines size tweak to dietfeatures.h.  Most of the
                     97:     string routines have been unrolled.  This is up to three times as
                     98:     fast but creates up to three times larger code.  Now you can disable
                     99:     the unrolling.
                    100:   added sendfile.
                    101:   I also added pread.  It works on x86 and sparc but not on ppc and mips.
                    102:     I have no idea what's going on.  strace disagrees with the kernel.
                    103:     Can anyone help?  I asked the Linux kernel mailing list for help, too.
                    104:   added a few aliases of the type __libc_open for open.  nm on
                    105:     libpthreads.so indicates that we will need them.
                    106: 
                    107: 0.6.7:
                    108:   the sources now compile without warnings with -Wall.
                    109:   printf now prints "(null)" when %s is passed NULL.  This can be
                    110:     removed with WANT_NULL_PRINTF in dietfeatures.h
                    111:   added vfprintf, execl, ttyname.
                    112:   stat, lstat and fstat are now #defined to __dietstat, __dietlstat and
                    113:     __dietfstat so they can use the normal kernel struct stat.
                    114:     stat, lstat and fstat are now C wrappers that convert to the glibc
                    115:     struct stat.  So we can avoid that overhead for programs that use
                    116:     dietlibc headers.
                    117: 
                    118: 0.6.6:
                    119:   changed the Makefiles so you can now set CFLAGS on the command line
                    120:   added memccmp (analogous to memccpy) and strncmp.
                    121:   Olaf fixed another bug in the sparc unified syscall.
                    122:   Paul Clifford contributed a C version of his strlen.S that is much
                    123:     more efficient than the previous strlen on all platforms!  It also
                    124:     looks like technology from Roswell. ;-}
                    125:   added a "real" stdio.  Well, almost.  Please contribute!
                    126:   added dietfeatures.h so you can remove features you don't need.
                    127:   removed debug code from vsnprintf that changed \0 to ' ' (argh!).
                    128:   stdio now works with simple programs and minigzip from libz.
                    129:   stdio uses some major trickery to avoid linking the stdio, stderr and
                    130:     stdout (and reserving space for them) when they are not used.
                    131: 
                    132: 0.6.5:
                    133:   Red Plait <redplait@ixcelerator.com> found several bugs in diet libc,
                    134:     most of them bugs in the new header files, but also missing sigset
                    135:     functions.
                    136:   Paul Clifford contributed an assembly strlen.S for ARM and fixed
                    137:     several bugs.
                    138:   Fixed ppc/setjmp and mips/pipe.
                    139:   Olaf contributed a new sparc unified syscall.
                    140: 
                    141: 0.6.4:
                    142:   declared is* static inline in getservent.
                    143:   added assert_fail, strtoul, isalpha, isdigit, isalnum, isascii.
                    144:   changed strlen to return 0 when passed NULL.
                    145:   new, much smaller unified syscall for MIPS.  Thanks to Olaf the Mad
                    146:     Scientist who actually implemented this without access to a MIPS
                    147:     box, just from reading the architecture manual.  And it worked out
                    148:     of the box.
                    149:   started a set of system includes, mainly so that I can use lcc and
                    150:     my alpha-linux cross compiler (which is unable to cross-compile
                    151:     glibc).  diet libc can now be compiled without any include files
                    152:     from a normal libc.  The includes do declare more than diet libc
                    153:     currently delivers and they are still far from complete for real
                    154:     applications.
                    155:   I will only add assembly versions that are smaller _and_ faster than
                    156:     the C version.  Larger routines are only accepted if they are called
                    157:     very often and are substantially faster.
                    158:   added i386 assembly strchr, which is smaller and faster than the old
                    159:     version.  It is, however, larger than the version contributed by
                    160:     proton (thanks, anyway).
                    161:   added i386 strlen (31% faster, 14% smaller)
                    162:   "make t" will now create a map file called "mapfile".
                    163: 
                    164: 0.6.3:
                    165:   added sys_errlist, strerror and perror
                    166:   added isblank
                    167:   added atol
                    168: 
                    169: 0.6.2:
                    170:   mmap for ARM didn't compile.  Thanks, Paul!
                    171: 
                    172: 0.6.1:
                    173:   split mmap into the architecture specific subdirectories.
                    174:   getenv now copes with environ==NULL, thanks Paul Clifford.
                    175:   Paul also contributed a smaller ARM startup code.
                    176: 
                    177: 0.6:
                    178:   strcat returned the wrong result.  Thanks, Dietz Pröpper.
                    179:   strtod now understands a negative exponent (oops, thanks Bertram Barth)
                    180:   Port to arm-linux-gnu, but on the Netwinder I use for testing the
                    181:     __dtostr does not work (I have no idea why!)
                    182:   The MIPS port now uses (much smaller) non-PIC code.  That means that
                    183:     the applications you link against diet libc also have to be compiled
                    184:     non-PIC.  I suggest copying the CFLAGS from the diet libc Makefile.
                    185:     Thanks to Ralf Bächle for helping me with this!
                    186:   I made subdirectories for the architectures and use VPATH to override
                    187:     VPATH so that make finds the source file automatically.  That should
                    188:     simplify the sources greatly.
                    189:   Olaf Dreesen contributed Alpha support including setjmp and longjmp!
                    190:   ARM and MIPS now also have setjmp and longjmp
                    191:   "compile" and "load" are now make targets.  Use them for djb programs.
                    192:   added contrib/elftrunc.c which will remove unnecessary ELF headers.
                    193:     Again, contributed from Olaf.  Great work!
                    194: 
                    195: 0.5.12:
                    196:   printf also does signed numbers.
                    197:   If you don't use atexit, dietlibc now does not link exit, only _exit.
                    198:   *printf now correctly returns the number of bytes written.
                    199:   Olaf contributed experimental sscanf and vsscanf implementations.
                    200:   If passed NULL as buffer, snprintf will not write anything but still
                    201:     return the number of bytes it would have written.
                    202:   Initial MIPS port!   (Oh, the agony!)
                    203:     No setjmp and longjmp support yet!  Please contribute!
                    204:   I even implemented unified syscalls for MIPS.  Still, MIPS code is
                    205:     almost twice the size of SPARC code.  If anyone knows why: please
                    206:     tell me!
                    207: 
                    208: 0.5.11:
                    209:   I implemented new unified syscalls for x86, sparc and ppc, this time based
                    210:     on .s files and not .c files, and I moved the syscalls into
                    211:     subdirectores to clean the dietlibc sources up a little.
                    212:   A binary consisting of printf("%s is %d\n","olaf",23) is now
                    213:     2864 bytes on sparc
                    214:     2488 bytes on intel
                    215:   I kludgily implemented fprintf(stdout,... and fprintf(stderr,...
                    216:     to make a few more applications work.
                    217:   Olaf Dreesen also implemented some unified syscall stuff for x86.
                    218:   He discovered that with our unified syscall interface it actually
                    219:     costs <10 bytes total to make all system calls thread safe!
                    220:   I implemented atexit() (can register up to 4 callbacks).
                    221:   I implemented strtod and __dtostr (the opposite).  Now we can add
                    222:     floating point support to vsnprintf and sscanf!
                    223: 
                    224: 0.5.10:
                    225:   I actually saw that I can not only merge the errno handling code of
                    226:     the system calls on x86, I can also merge the rest (including the
                    227:     arguments) except for setting the system call number.  All those
                    228:     system calls are now just a jump to a unified system call handler.
                    229:     I got rid of x86openclose again.  The savings are substantial:
                    230:     chown from embutils went from 7664 to 7184 bytes!
                    231:     If I'd move the system call wrappers to assembly language, I could
                    232:     even reduce the alignment (does not matter since it's just a jump
                    233:     anyway) and get rid of the "ret" behind each jump (one byte per
                    234:     system call!)
                    235: 
                    236: 0.5.9:
                    237:   added memchr, strpbrk, strstr, strtol, isspace (hehe)
                    238:   fixed strdup
                    239:   fixed return values for strcpy and strcat (thanks to Norbert Berzen)
                    240:   Olaf Dreesen contributed a strtol and initial {sn|vsn|}printf implementation
                    241:     (no signed integers, only strings and unsigned integers (but
                    242:     supporting octal, hex and decimal).  Thanks, Olaf!  (by the way:
                    243:     that code must be wonderful, I don't understand it at all *bg*)
                    244:     Olaf's printf does understand padding like in "%08d" and "%8d" and
                    245:     automatically pads pointers with '0'.
                    246:   Rewrote the x86 start code, old: 22 instructions, new: 12 instructions.
                    247:   Thanks to proton for inspiration on this.
                    248:   The new x86 start code also does not reference exit any more, thus saving
                    249:   64 bytes for executables that don't call exit explicitly.
                    250:     [insert maniacal laughter] EVERY BYTE COUNTS!1!! ;-)
                    251:   Moved errno and environ to start.S, saving no byte binary size but
                    252:     speeding up compilation and slightly shortening dietlibc.a ;-)
                    253:   For x86: joined open and close into one assembler file, sharing the
                    254:     errno handling.  This is a feasibility test and it actually saves a
                    255:     few bytes.  I think I will reimplement the _syscall[1-6] macros on
                    256:     all platforms now to share the errno handling code for them.
                    257: 
                    258: 0.5.8:
                    259:   fixed strchr to be able to look for 0.
                    260: 
                    261:   added _llseek, ftruncate, getpgid, getresgid, getresuid, getsid,
                    262:   memccpy, memmove, mprotect, setregid, setresgid, setresuid, setreuid,
                    263:   strncpy, swapon, truncate, strtok, strtok_r, strspn, strcspn (all
                    264:   contributed by Olaf Dreesen)
                    265: 
                    266:   added execvp, getcwd
                    267: 
                    268:   fixed __xmknod
                    269: 
                    270:   Note: can it be that the ftw interface really is so broken that I
                    271:   cannot implement it without having to implement some searching data
                    272:   structure?  I included an experimental ftw implementation that will
                    273:   not follow symlinks.
                    274: 
                    275: 0.5.7:
                    276:   oops, if_nametoindex was broken!
                    277: 
                    278: 0.5.6:
                    279:   ported to ppc-linux.
                    280:   fixed i386 sigsetjmp (I mistyped the function name)
                    281:   included sigjmp.c
                    282: 
                    283: 0.5.5:
                    284:   added wait, sys_siglist, longjmp/setjmp/sigsetjmp for i386 and sparc
                    285:   actually, it wasn't fork that wasn't working for sparc, it was pipe.
                    286:   I fixed it now.
                    287:   dietlibc/SPARC assumes -msupersparc (does not provide div, mul, etc)
                    288:   fixed readdir to use getdents and not the intel inline asm
                    289: 
                    290: 0.5.4:
                    291:   ported to sparclinux (sparc32 only).  Beware: does not work yet.
                    292:   added raise, abort, readlink, strcat, geteuid, geteuid, wait3, access
                    293: 
                    294: 0.5.3:
                    295:   added tcsetattr and getenv to compile e3
                    296: 
                    297: 0.5.2:
                    298:   added vhangup, tcgetattr, isatty and memcmp for fgetty
                    299:     (http://www.fefe.de/fgetty/)
                    300:   added localtime from uC-libc.
                    301: 
                    302: 0.5.1:
                    303:   stat and friends actually work now.  Yuck!  Another case of
                    304:     translation between kernel and userland.  Why can't the kernel
                    305:     people and the libc people simply agree on a standard?
                    306:   removed many unnecessary includes to speed up compilation.
                    307:   added -fomit-frame-pointer and i386 compilation target to reduce code size.
                    308:   inlined socketcall to reduce code size.
                    309:   "load" and "compile" are examples for djb code.
                    310: 
                    311: 0.5:
                    312:   Olaf Dreesen contributed a much smaller implementation of malloc and friends.
                    313:   each object file is now treated with "strip -x -R .note -R .comment"
                    314:   split each system call into a separate object file
                    315:   added ntohs, htons, alarm, if_indextoname and if_nametoindex
                    316: 
                    317: 0.4.1:
                    318:   oops, the strchr implementation was wrong.  Thanks Jens Laas!
                    319: 
                    320: 0.4:
                    321:   copied opendir and friends from uC-libc.
                    322:   added getservent and getservby* in gerservent.c
                    323: 
                    324: 0.3:
                    325:   remove readdir system call
                    326:   added getdents system call
                    327:   added getpwnam/getpwuid implementation in getpwnam.c
                    328:   added a few string functions (in str*.c)
                    329: