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doc: c library: document which c functions are implemented.

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Add supported C library functions in the minimal libc

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
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Anas Nashif 2019-09-15 23:47:55 -04:00
commit 7d82e1765b
1 changed files with 63 additions and 4 deletions
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doc/guides/c_library.rst
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@ -4,12 +4,12 @@ Standard C Library
################## ##################
The kernel currently provides only the minimal subset of the standard C library The kernel currently provides only the minimal subset of the standard C library
required to meet the kernel's own needs, primarily in the areas of string required to meet the needs of Zephyr and its subsystems and features, primarily
manipulation and display. in the areas of string manipulation and display.
Applications that require a more extensive C library can either submit Applications that require a more extensive C library can either submit
contributions that enhance the existing library or substitute with a replacement contributions that enhance the existing library or substitute with a
library. replacement library.
The Zephyr SDK and other supported toolchains comes with a bare-metal C library The Zephyr SDK and other supported toolchains comes with a bare-metal C library
based on ``newlib`` that can be used with Zephyr by selecting the based on ``newlib`` that can be used with Zephyr by selecting the
@ -17,3 +17,62 @@ based on ``newlib`` that can be used with Zephyr by selecting the
support for ``newlib`` is a set of hooks available under support for ``newlib`` is a set of hooks available under
:file:`lib/libc/newlib/libc-hooks.c` which integrates the c library with basic :file:`lib/libc/newlib/libc-hooks.c` which integrates the c library with basic
kernel services. kernel services.
Minimal C Library
*****************
The minimal C library is part of Zephyr and provides a minimal set of C
functions needed by Zephyr.
The following functions are implemented in the minimal C
library included with Zephyr:
.. hlist::
:columns: 3
- abs()
- atoi()
- bsearch()
- calloc()
- free()
- gmtime()
- gmtime_r()
- isalnum()
- isalpha()
- isdigit()
- isgraph()
- isprint()
- isspace()
- isupper()
- isxdigit()
- localtime()
- malloc()
- memchr()
- memcmp()
- memcpy()
- memmove()
- memset()
- mktime()
- rand()
- realloc()
- snprintf()
- sprintf()
- strcat()
- strchr()
- strcmp()
- strcpy()
- strlen()
- trncat()
- strncmp()
- strncpy()
- strrchr()
- strstr()
- strtol()
- trtoul()
- time()
- tolower()
- toupper()
- vsnprintf()
- vsprintf()