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https://github.com/zephyrproject-rtos/zephyr
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f6521290e6
For long lists of items, it's better to use a multi-column display to make better use of the screen space. We used the hlist directive to accomplish list, but it has a drawback on small (phone) screens because under the hood, the rendering is done using tables. Instead, we can take advantage of built-in CSS multi-column support available in recent browsers. So, convert uses of the hlist directive to use an rst-class directive to apply a multi-column class to the entity. The chosen column-width (18em) gives us a 3-column display on typical window sizes, but will adjust to more or fewer columns depending on the actual real estate available. Also, update the documentation guidelines to mention this change. Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
78 lines
1.7 KiB
ReStructuredText
78 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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