64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
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/*
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* Operations on the usual buffers of bytes
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*/
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#ifndef BNSECURE
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#define BNSECURE 1
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#endif
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/*
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* These operations act on buffers of memory, just like malloc & free.
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* One exception: it is not legal to pass a NULL pointer to lbnMemFree.
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*/
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#ifndef lbnMemAlloc
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void *lbnMemAlloc(unsigned bytes);
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#endif
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#ifndef lbnMemFree
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void lbnMemFree(void *ptr, unsigned bytes);
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#endif
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/* This wipes out a buffer of bytes if necessary needed. */
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#ifndef lbnMemWipe
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#if BNSECURE
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void lbnMemWipe(void *ptr, unsigned bytes);
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#else
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#define lbnMemWipe(ptr, bytes) (void)(ptr,bytes)
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#endif
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#endif /* !lbnMemWipe */
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/*
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* lbnRealloc is NOT like realloc(); it's endian-sensitive!
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* If lbnMemRealloc is #defined, lbnRealloc will be defined in terms of it.
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* It is legal to pass a NULL pointer to lbnRealloc, although oldbytes
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* will always be sero.
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*/
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#ifndef lbnRealloc
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void *lbnRealloc(void *ptr, unsigned oldbytes, unsigned newbytes);
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#endif
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/*
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* These macros are the ones actually used most often in the math library.
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* They take and return pointers to the *end* of the given buffer, and
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* take sizes in terms of words, not bytes.
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*
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* Note that LBNALLOC takes the pointer as an argument instead of returning
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* the value.
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*
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* Note also that these macros are only useable if you have included
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* lbn.h (for the BIG and BIGLITTLE macros), which this file does NOT include.
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*/
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#define LBNALLOC(p,type,words) BIGLITTLE( \
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if ( ((p) = (type *)lbnMemAlloc((words)*sizeof*(p))) != 0) \
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(p) += (words), \
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(p) = (type *)lbnMemAlloc((words) * sizeof*(p)) \
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)
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#define LBNFREE(p,words) lbnMemFree((p) BIG(-(words)), (words) * sizeof*(p))
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#define LBNREALLOC(p,old,new) \
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lbnRealloc(p, (old) * sizeof*(p), (new) * sizeof*(p))
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#define LBNWIPE(p,words) lbnMemWipe((p) BIG(-(words)), (words) * sizeof*(p))
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