Last change
on this file since 678 was
444,
checked in by satin@…, 7 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.2 KB
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Line | |
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1 | /* sbrk.c -- allocate memory dynamically. |
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2 | * |
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3 | * |
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4 | * Copyright (C) 2015 FTDI (support@ftdichip.com) |
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5 | * |
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6 | * The authors hereby grant permission to use, copy, modify, distribute, |
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7 | * and license this software and its documentation for any purpose, provided |
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8 | * that existing copyright notices are retained in all copies and that this |
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9 | * notice is included verbatim in any distributions. No written agreement, |
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10 | * license, or royalty fee is required for any of the authorized uses. |
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11 | * Modifications to this software may be copyrighted by their authors |
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12 | * and need not follow the licensing terms described here, provided that |
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13 | * the new terms are clearly indicated on the first page of each file where |
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14 | * they apply. |
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15 | */ |
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16 | #include <errno.h> |
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17 | #include "glue.h" |
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18 | |
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19 | char *__heap_ptr = (char *)&_end; |
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20 | |
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21 | /* |
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22 | * sbrk -- changes heap size size. Get nbytes more |
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23 | * RAM. We just increment a pointer in what's |
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24 | * left of memory on the board. |
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25 | */ |
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26 | char * |
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27 | _sbrk (nbytes) |
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28 | int nbytes; |
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29 | { |
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30 | char *base; |
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31 | char *sp; |
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32 | char canary; |
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33 | |
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34 | if ((__heap_ptr + nbytes) < (&canary - 2000)) |
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35 | { |
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36 | base = __heap_ptr; |
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37 | __heap_ptr += nbytes; |
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38 | return base; |
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39 | } |
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40 | else |
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41 | { |
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42 | errno = ENOMEM; |
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43 | return ((char *)-1); |
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44 | } |
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45 | } |
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