ARM VERSION 1.2 Datový list stáhnout pdf (Strana 192)

The C and C++ Libraries

alloca()

must not be called through a function pointer. You must take care when using

alloca()

and

setjmp()

in the same function, because memory allocated by

alloca()

between calling

setjmp()

and

longjmp()

is deallocated by the call to

longjmp()

This function is a common nonstandard extension to many C libraries.

Syntax

void* alloca(size_t size)

4.14.9 _fisatty()

The

_fisatty()

functiondetermines whether the given

stdio

stream is attached to a

terminal device or a normal file. It calls the

_sys_istty()

low-level function (see

Tailoring the input/output functions on page 4-75) on the underlying file handle.

This function is an ARM-specific library extension.

Syntax

int _fisatty(FILE *stream)

The return value indicates the stream destination:

0 A file.

1 A terminal.

Negative An error.

4.14.10 __heapstats()

The

__heapstats()

functiondisplays statistics on the state of the storage allocation heap.

It calls the

__Heap_Stats()

function, which you can re-implement if you choose to do

your own storage management (see __Heap_Stats() on page 4-65). The ARM default

implementation gives information on how many free blocks exist, and estimates their

size ranges.

Example 4-20 on page 4-103 shows an example of the output from

__heapstats()

. Line

1 of the output displays the total number of bytes, the number of free blocks, and the

average size. The following lines give an estimate the size of each block in bytes,

expressed as a range.

__heapstats()

does not give information on the number of used

blocks.

1 2 ... 187 188 189 190 191 192 193 194 195 196 197 ... 275 276

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