984bfae831
Remove leading/trailing blank lines in .c, .h, .py, .rst, .yml, and .yaml files. Will avoid failures with the new CI test in https://github.com/zephyrproject-rtos/ci-tools/pull/112, though it only checks changed files. Move the 'target-notes' target in boards/xtensa/odroid_go/doc/index.rst to get rid of the trailing blank line there. It was probably misplaced. Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
77 lines
1.7 KiB
ReStructuredText
77 lines
1.7 KiB
ReStructuredText
.. _c_library_v2:
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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 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
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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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:option:`CONFIG_NEWLIB_LIBC` in the application configuration file. Part of 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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.. rst-class:: rst-columns
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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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