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Description:
This function changes the size of a dynamically allocated region of
memory, preserving its contents up to the minimum of the old and new sizes. This may
involve copying the contents to a new location, so a new pointer is returned (and the
old memory freed if necessary).
This function is similar to the standard C " realloc" function except that it provides
better security against programming errors and also supports the allocation
of zero-size memory regions (indicated by a NULL pointer).
Synopsis
void
∗astRealloc(
void ∗ptr,
size_t size )
Parameters:
ptr
Pointer to previously allocated memory (or NULL
if the previous size of the allocated memory was zero).
size
New size
required for the memory region. This may be zero, in which case a NULL pointer is
returned (no error results). It should not be negative.
Returned Value
astRealloc()
If the memory was reallocated successfully, a pointer to the start
of the new memory region is returned (this may be the same as the original
pointer). If size was given as zero, a NULL pointer is returned.
Notes:
-
If this function is invoked with the error status set, or if it fails for any reason,
the original pointer value is returned and the memory contents are unchanged. Note that
this behaviour differs from that of the standard C " realloc" function which returns
NULL if it fails.
Copyright (C) 2021 East Asian Observatory
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A Library for Handling
World
Coordinate Systems
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