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2012-04-15add F_SETSIG and F_GETSIG (linux specific) to fcntl.hRich Felker-0/+6
F_* is in the reserved namespace so no feature test is needed
2012-04-14fix signedness error handling invalid multibyte sequences in regexecRich Felker-2/+2
the "< 0" test was always false due to use of an unsigned type. this resulted in infinite loops on 32-bit machines (adding -1U to a pointer is the same as adding -1) and crashes on 64-bit machines (offsetting the string pointer by 4gb-1b when an illegal sequence was hit).
2012-04-13rename __sa_restorer to sa_restorer in struct sigactionRich Felker-1/+1
this is legal since sa_* is in the reserved namespace for signal.h, per posix. note that the sa_restorer field is not used anywhere, so programs that are trying to use it may still break, but at least they'll compile. if it turns out such programs actually need to be able to set their own sa_restorer to function properly, i'll add the necessary code to sigaction.c later.
2012-04-13remove invalid code from TRERich Felker-14/+0
TRE wants to treat + and ? after a +, ?, or * as special; ? means ungreedy and + is reserved for future use. however, this is non-conformant. although redundant, these redundant characters have well-defined (no-op) meaning for POSIX ERE, and are actually _literal_ characters (which TRE is wrongly ignoring) in POSIX BRE mode. the simplest fix is to simply remove the unneeded nonstandard functionality. as a plus, this shaves off a small amount of bloat.
2012-04-13fix broken regerror (typo) and missing messageRich Felker-2/+2
2012-04-13use fast version of the int reading code for the high-order digits tooRich Felker-3/+13
this increases code size slightly, but it's considerably faster, especially for power-of-2 bases.
2012-04-13use macros instead of inline functions in shgetc.hRich Felker-20/+4
at -Os optimization level, gcc refuses to inline these functions even though the inlined code would roughly the same size as the function call, and much faster. the easy solution is to make them into macros.
2012-04-13fix spurious overflows in strtoull with small basesRich Felker-7/+3
whenever the base was small enough that more than one digit could still fit after UINTMAX_MAX/36-1 was reached, only the first would be allowed; subsequent digits would trigger spurious overflow, making it impossible to read the largest values in low bases.
2012-04-12remove magic numbers from floatscanRich Felker-5/+5
2012-04-12optimize more integer cases in floatscan; comment the whole procedureRich Felker-8/+27
2012-04-11revert invalid optimization in floatscanRich Felker-2/+2
2012-04-11fix stupid typo in floatscan that caused excess rounding of some valuesRich Felker-1/+1
2012-04-11add some more useful suggested options to config.mak templateRich Felker-0/+6
2012-04-11Merge remote branch 'nsz/master'Rich Felker-5/+6
2012-04-11optimize floatscan downscaler to skip results that won't be neededRich Felker-2/+3
when upscaling, even the very last digit is needed in cases where the input is exact; no digits can be discarded. but when downscaling, any digits less significant than the mantissa bits are destined for the great bitbucket; the only influence they can have is their presence (being nonzero). thus, we simply throw them away early. the result is nearly a 4x performance improvement for processing huge values. the particular threshold LD_B1B_DIG+3 is not chosen sharply; it's simply a "safe" distance past the significant bits. it would be nice to replace it with a sharp bound, but i suspect performance will be comparable (within a few percent) anyway.
2012-04-11simplify/debloat radix point alignment code in floatscanRich Felker-9/+4
now that this is the first operation, it can rely on the circular buffer contents not being wrapped when it begins. we limit the number of digits read slightly in the initial parsing loops too so that this code does not have to consider the case where it might cause the circular buffer to wrap; this is perfectly fine because KMAX is chosen as a power of two for circular-buffer purposes and is much larger than it otherwise needs to be, anyway. these changes should not affect performance at all.
2012-04-11optimize floatscan: avoid excessive upscalingRich Felker-27/+27
upscaling by even one step too much creates 3-29 extra iterations for the next loop. this is still suboptimal since it always goes by 2^29 rather than using a smaller upscale factor when nearing the target, but performance on common, small-magnitude, few-digit values has already more than doubled with this change. more optimizations on the way...
2012-04-11fix incorrect initial count in shgetc when data is already bufferedRich Felker-1/+1
2012-04-11fix bug parsing lone zero followed by junk, and hex float over-readingRich Felker-6/+5
2012-04-10fix float scanning of certain values ending in zerosRich Felker-1/+3
for example, "1000000000" was being read as "1" due to this loop exiting early. it's necessary to actually update z and zero the entries so that the subsequent rounding code does not get confused; before i did that, spurious inexact exceptions were being raised.
2012-04-10fix potential overflow in exponent readingRich Felker-1/+1
note that there's no need for a precise cutoff, because exponents this large will always result in overflow or underflow (it's impossible to read enough digits to compensate for the exponent magnitude; even at a few nanoseconds per digit it would take hundreds of years).
2012-04-10set errno properly when parsing floating pointRich Felker-4/+21
2012-04-10add "scan helper getc" and rework strtod, etc. to use itRich Felker-75/+115
the immediate benefit is a significant debloating of the float parsing code by moving the responsibility for keeping track of the number of characters read to a different module. by linking shgetc with the stdio buffer logic, counting logic is defered to buffer refill time, keeping the calls to shgetc fast and light. in the future, shgetc will also be useful for integrating the new float code with scanf, which needs to not only count the characters consumed, but also limit the number of characters read based on field width specifiers. shgetc may also become a useful tool for simplifying the integer parsing code.
2012-04-10unify strtof/strtod/strtold wrappers and fix initial whitespace issueRich Felker-34/+21
2012-04-10new floating point parser/converterRich Felker-94/+477
this version is intended to be fully conformant to the ISO C, POSIX, and IEEE standards for conversion of decimal/hex floating point strings to float, double, and long double (ld64 or ld80 only at present) values. in particular, all results are intended to be rounded correctly according to the current rounding mode. further, this implementation aims to set the floating point underflow, overflow, and inexact flags to reflect the conversion performed. a moderate amount of testing has been performed (by nsz and myself) prior to integration of the code in musl, but it still may have bugs. so far, only strto(d|ld|f) use the new code. scanf integration will be done as a separate commit, and i will add implementations of the wide character functions later.
2012-04-09fix alloca issue in stdlib.h tooRich Felker-1/+1
I forgot _GNU_SOURCE also has it declared here...
2012-04-09alloca cannot be a function. #define it to the gcc builtin if possibleRich Felker-0/+4
gcc makes this mapping by default anyway, but it will be disabled by -fno-builtin (and presumably by -std=c99 or similar). for the main program the error will be reported by the linker, and the issue can easily be fixed, but for dynamic-loaded so files, the error cannot be detected until dlopen time, at which point it has become very obscure.
2012-04-04math: fix x86 asin accuracynsz-5/+6
use (1-x)*(1+x) instead of (1-x*x) in asin.s the later can be inaccurate with upward rounding when x is close to 1
2012-04-04work around nasty gcc bug in the i386 syscall asmRich Felker-4/+4
when the "r" (register) constraint is used to let gcc choose a register, gcc will sometimes assign the same register that was used for one of the other fixed-register operands, if it knows the values are the same. one common case is multiple zero arguments to a syscall. this horribly breaks the intended usage, which is swapping the GOT pointer from ebx into the temp register and back to perform the syscall. presumably there is a way to fix this with advanced usage of register constaints on the inline asm, but having bad memories about hellish compatibility issues with different gcc versions, for the time being i'm just going to hard-code specific registers to be used. this may hurt the compiler's ability to optimize, but it will fix serious miscompilation issues. so far the only function i know what compiled incorrectly is getrlimit.c, and naturally the bug only applies to shared (PIC) builds, but it may be more extensive and may have gone undetected..
2012-04-03remove useless (at best, harmful) feature test checks in aio.hRich Felker-5/+0
2012-04-01improve name lookup performance in corner casesRich Felker-2/+2
the buffer in getaddrinfo really only matters when /etc/hosts is huge, but in that case, the huge number of syscalls resulting from a tiny buffer would seriously impact the performance of every name lookup. the buffer in __dns.c has also been enlarged a bit so that typical resolv.conf files will fit fully in the buffer. there's no need to make it so large as to dominate the syscall overhead for large files, because resolv.conf should never be large.
2012-03-30optimize signbit macroRich Felker-2/+2
2012-03-30make math.h more c++-friendlyRich Felker-2/+5
2012-03-29math: minor cleanups in ceil and floornsz-10/+7
2012-03-29math: remove x86 modf asmnsz-111/+0
the int part was wrong when -1 < x <= -0 (+0.0 instead of -0.0) and the size and performace gain of the asm version was negligible
2012-03-29math: rewrite modf.c and clean up modff.cnsz-72/+45
cleaner implementation with unions and unsigned arithmetic
2012-03-28math: fix modfl.c bugnsz-1/+1
modfl(+-inf) was wrong on ld80 because the explicit msb was not taken into account during inf vs nan check
2012-03-27math: fix a regression in powl and do some cleanupsnsz-12/+11
previously a division was accidentally turned into integer div (w = -i/NXT;) instead of long double div (w = -i; w /= NXT;)
2012-03-27math: add dummy tgamma and tgammaf implementationsnsz-0/+32
2012-03-27math: remove comment about aliasing lgamma as gammansz-8/+4
It is probably not worth supporting gamma. (it was already deprecated in 4.3BSD)
2012-03-27math: fix typo in i386 remquof and remquol asmnsz-5/+5
(fldl instruction was used instead of flds and fldt)
2012-03-26Merge branch 'master' of git://git.etalabs.net/muslnsz-10/+32
2012-03-25Merge remote branch 'nsz/master'Rich Felker-15/+6
2012-03-25add strfmon_l variant (still mostly incomplete)Rich Felker-3/+27
2012-03-24update COPYRIGHT status of TRE regex codeRich Felker-4/+4
2012-03-24update README to remove information no longer relevant as of 0.8.7Rich Felker-3/+1
2012-03-23Merge branch 'master' of git://git.etalabs.net/muslnsz-6/+103
2012-03-23asm for hypot and hypotfRich Felker-0/+87
special care is made to avoid any inexact computations when either arg is zero (in which case the exact absolute value of the other arg should be returned) and to support the special condition that hypot(┬▒inf,nan) yields inf. hypotl is not yet implemented since avoiding overflow is nontrivial.
2012-03-23make dlerror conform to posixRich Felker-6/+16
the error status is required to be sticky after failure of dlopen or dlsym until cleared by dlerror. applications and especially libraries should never rely on this since it is not thread-safe and subject to race conditions, but glib does anyway.
2012-03-23minor rintl.c fix: remove unsupported ldbl format messagensz-2/+0