The ARM C library is fully compliant with the ISO C99 library
standard. See Table 14 for GNU,
POSIX, BSD-derived, and ARM compiler-specific extensions.
Table 14. C library extensions
Function
Header file definition
Extension
wcscasecmp()
wchar.h
GNU extension supported by the ARM libraries
wcsncasecmp()
wchar.h
GNU extension supported by the ARM libraries
wcstombs()
stdlib.h
POSIX extended functionality
posix_memalign()
stdlib.h
POSIX extended functionality
alloca()
alloca.h
Common non standard extension to many C libraries
strlcpy()
string.h
Common BSD-derived extension to many C libraries
strlcat()
string.h
Common BSD-derived extension to many C libraries
strcasecmp()
string.h
Standardized by POSIX
strncasecmp()
string.h
Standardized by POSIX
_fisatty()
stdio.h
Specific to the ARM compiler
__heapstats()
stdlib.h
Specific to the ARM compiler
__heapvalid()
stdlib.h
Specific to the ARM compiler
See also
Reference
ARM C and C++ Libraries and Floating-Point
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