This aligns abort() and exit() definitions with other libc.
Without 'noreturn' attribute, compilers have to assume that we will
return from these functions which can lead to surprising errors like
'error: non-void function does not return a value'.
Signed-off-by: Patryk Duda <patrykd@google.com>
Support getting and setting POSIX environment variables.
Additionally, the thread-safe BSD variant getenv_r() is
provided.
environ, getenv(), setenv(), and unsetenv() are required by
the POSIX_SINGLE_PROCESS Option Group as detailed in
Section E.1 of IEEE-1003.1-2017.
The POSIX_SINGLE_PROCESS Option Group is required for PSE51,
PSE52, PSE53, and PSE54 conformance, and is otherwise mandatory
for any POSIX conforming system as per Section A.2.1.3 of
IEEE-1003-1.2017.
Signed-off-by: Christopher Friedt <cfriedt@meta.com>
Extend capabilities of a minimal libc to support C11 capability
to allocate memory with requested alignment.
Signed-off-by: Piotr Pryga <piotr.pryga@nordicsemi.no>
This commit adds the `rand_r` function, which is a reentrant (i.e.
thread-safe) version of the `rand` function, such that a thread-safe
variant is always available.
Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
- strtoll() and strtoull() are copies of strtol() and strtoul() with
types changed to long long instead of long.
- added tests
- added documentation
- removed stubs from civetweb sample
Signed-off-by: Gerhard Jörges <joerges@metratec.com>
Remove the cast of the two parameter compare function used by qsort, to
the three parameter callback function used by qsort_r, in order to
ensure compatibility with other toolchains, even those off-tree.
Fixes#42870
Signed-off-by: Danny Oerndrup <daor@demant.com>
This change implements qsort() for the minimal libc via Heapsort.
Heapsort time complexity is O(n log(n)) in the best, average,
and worst cases. It is O(1) in space complexity (i.e. sorts
in-place) and is iterative rather than recursive. Heapsort is
not stable (i.e. does not preserve order of identical elements).
On cortex-m0, this implementation occupies ~240 bytes.
Fixes#28896
Signed-off-by: Christopher Friedt <chrisfriedt@gmail.com>
rand() and srand() are pseudo-random number generator functions
defined in ISO C. This implementation uses the Linear Congruential
Generator (LCG) algorithm with the following parameters, which are the
same as used in GNU Libc "TYPE_0" algorithm.
Modulus 2^31
Multiplier 1103515245
Increment 12345
Output Bits 30..0
Note that the default algorithm used by GNU Libc is not TYPE_0, and
TYPE_0 should be selected first by an initstate() call as shown below.
All global variables in a C library must be routed to a memory
partition in order to be used by user-mode applications when
CONFIG_USERSPACE is enabled. Thus, srand_seed is marked as
such. z_libc_partition is originally used by the Newlib C library but
it's generic enough to be used by either the minimal libc or the
newlib.
All other functions in the Minimal C library, however, don't require
global variables/states. Unconditionally using z_libc_partition with
the minimal libc might be a problem for applications utilizing many
custom memory partitions on platforms with a limited number of MPU
regions (eg. Cortex M0/M3). This commit introduces a kconfig option
CONFIG_MINIMAL_LIBC_RAND so that applications can enable the
functions if needed. The option is disabled by default.
Because this commit _does_ implement rand() and srand(), our coding
guideline check on GitHub Action finds it as a violation.
Error: lib/libc/minimal/include/stdlib.h:45:WARNING: Violation to
rule 21.2 (Should not used a reserved identifier) - srand
But this is false positive.
The following is a simple test program for LCG with GNU Libc.
#include <stdio.h>
#include <stdlib.h>
int main()
{
static char state[8];
/* Switch GLIBC to use LCG/TYPE_0 generator type. */
initstate(0, state, sizeof(state));
srand(1); /* Or any other value. */
printf("%d\n", rand());
printf("%d\n", rand());
return 0;
}
See initstate(3p) for more detail about how to use LCG in GLIBC.
Signed-off-by: Yasushi SHOJI <yashi@spacecubics.com>
The identifiers used in the declaration and definition of a function
shall be identical [MISRAC2012-RULE_8_3-b]
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Add support for abs with additional integer types.
This is needed to make LLVM quiet and stop warning about abs being used
with int64_t and such.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
abort() is an important runtime function, oftentimes used to signal
abnormal execution conditions in generic applications. Worse, they
may be used under such circumstances in e.g. compiler support
libraries, in which case lack of implementation of this function
will lead to link error.
Fixes: #29541
Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Any word started with underscore followed by and uppercase letter or a
second underscore is a reserved word according with C99.
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
Add abs function to the minimal libc. This is present in
NEWLIB_LIBC, but adding it here avoid to make a dependency
with NEWLIB_LIBC.
Signed-off-by: Vincent Veron <vincent.veron@st.com>
Replace the existing Apache 2.0 boilerplate header with an SPDX tag
throughout the zephyr code tree. This patch was generated via a
script run over the master branch.
Also updated doc/porting/application.rst that had a dependency on
line numbers in a literal include.
Manually updated subsys/logging/sys_log.c that had a malformed
header in the original file. Also cleanup several cases that already
had a SPDX tag and we either got a duplicate or missed updating.
Jira: ZEP-1457
Change-Id: I6131a1d4ee0e58f5b938300c2d2fc77d2e69572c
Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
According to commit b71a8a4591 and Jira: ZEP-733
(libc: remove stddef.h which is provided by the compiler),
the stddef.h in zephyr code is removed and it's provided
by the compiler. The original stddef.h includes two head
files, null.h and size_t.h, which are also useless now.
So remove these two deprecated files, in case conflicting
definition.
Change-Id: Ie7163fdbd23c32759425b50f3deff2a57cc051a9
Signed-off-by: Qiu Peiyang <peiyangx.qiu@intel.com>
The libc 'ctype.h' header file is not supposed to be automatically
included when including 'stdlib.h'.
Change-Id: I821a9946894572a7b82804b1569b7b18c24316db
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
Consolidates the definitions of size_t in the minimal libc library.
This prevents code duplication.
Change-Id: I996990ad9093ebec1f9ba0045d14319e1a243e70
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
Consolidates definitions of NULL in the minimal libc library.
This prevents code duplication.
Change-Id: Ia4a2bde1329d66e7c83afeab806a39b22704ab48
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
Adds extern "C" { } blocks to header files so that they can be
safely used by C++ source files.
Change-Id: Ia4db0c36a5dac5d3de351184a297d2af0df64532
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
Change all the Intel and Wind River code license from BSD-3 to Apache 2.
Change-Id: Id8be2c1c161a06ea8a0b9f38e17660e11dbb384b
Signed-off-by: Javier B Perez Hernandez <javier.b.perez.hernandez@linux.intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
