/*! ----------------------------------------------------------------------------
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* @file syscalls.c
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* @brief Standard syscalls platform-specific implementation
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*
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* @attention
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*
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* Copyright 2015 (c) Decawave Ltd, Dublin, Ireland.
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*
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* All rights reserved.
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*
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* @author Decawave
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*/
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#include <sys/types.h>
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#include "port.h"
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/*! ------------------------------------------------------------------------------------------------------------------
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* @fn _sbrk()
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*
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* @brief Increment heap pointer to allow dynamic memory allocation.
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*
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* @param incr size of the heap increment to perform, in bytes
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*
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* @return pointer on the previous heap end or -1 if memory is full and increment cannot be performed.
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*/
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caddr_t _sbrk(int incr)
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{
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extern char _ebss; /* Defined by the linker. */
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static char *heap_end;
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char *prev_heap_end;
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char *stack;
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if (heap_end == 0)
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{
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heap_end = &_ebss;
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}
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prev_heap_end = heap_end;
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stack = (char*) port_GET_stack_pointer();
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if (heap_end + incr > stack)
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{
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return (caddr_t) -1;
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}
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heap_end += incr;
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return (caddr_t) prev_heap_end;
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}
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