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