| 1 | /* |
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| 2 | Copyright (c) 2015, Synopsys, Inc. All rights reserved. |
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| 3 | |
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| 4 | Redistribution and use in source and binary forms, with or without |
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| 5 | modification, are permitted provided that the following conditions are met: |
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| 6 | |
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| 7 | 1) Redistributions of source code must retain the above copyright notice, |
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| 8 | this list of conditions and the following disclaimer. |
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| 9 | |
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| 10 | 2) Redistributions in binary form must reproduce the above copyright notice, |
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| 11 | this list of conditions and the following disclaimer in the documentation |
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| 12 | and/or other materials provided with the distribution. |
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| 13 | |
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| 14 | 3) Neither the name of the Synopsys, Inc., nor the names of its contributors |
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| 15 | may be used to endorse or promote products derived from this software |
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| 16 | without specific prior written permission. |
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| 17 | |
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| 18 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| 19 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 20 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 21 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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| 22 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 23 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 24 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 25 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 26 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 27 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 28 | POSSIBILITY OF SUCH DAMAGE. |
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| 29 | */ |
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| 30 | |
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| 31 | #include <sys/types.h> |
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| 32 | #include <sys/errno.h> |
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| 33 | |
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| 34 | extern char __start_heap; |
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| 35 | extern char __end_heap; |
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| 36 | |
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| 37 | caddr_t |
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| 38 | _sbrk (size_t nbytes) |
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| 39 | { |
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| 40 | static char* heap_ptr = NULL; |
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| 41 | char* prev_heap_ptr; |
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| 42 | |
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| 43 | if (heap_ptr == NULL) |
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| 44 | { |
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| 45 | heap_ptr = &__start_heap; |
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| 46 | } |
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| 47 | |
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| 48 | /* Align the 'heap_ptr' so that memory will always be allocated at word |
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| 49 | boundaries. */ |
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| 50 | heap_ptr = (char *) ((((unsigned long) heap_ptr) + 7) & ~7); |
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| 51 | prev_heap_ptr = heap_ptr; |
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| 52 | |
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| 53 | if ((heap_ptr + nbytes) < &__end_heap) |
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| 54 | { |
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| 55 | heap_ptr += nbytes; |
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| 56 | return (caddr_t) prev_heap_ptr; |
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| 57 | } |
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| 58 | |
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| 59 | errno = ENOMEM; |
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| 60 | return (caddr_t) -1; |
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| 61 | } |
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