40 lines
857 B
C
40 lines
857 B
C
#include <lib.h>
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/* memccpy - copy bytes up to a certain char
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*
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* CHARBITS should be defined only if the compiler lacks "unsigned char".
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* It should be a mask, e.g. 0377 for an 8-bit machine.
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*/
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#include <ansi.h>
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#include <stddef.h>
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_PROTOTYPE( void *memccpy, (void *dst, const void *src,
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int ucharstop, size_t size));
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#ifndef CHARBITS
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# define UNSCHAR(c) ((unsigned char)(c))
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#else
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# define UNSCHAR(c) ((c)&CHARBITS)
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#endif
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void *memccpy(dst, src, ucharstop, size)
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void * dst;
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_CONST void * src;
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int ucharstop;
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_SIZET size;
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{
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register char *d;
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register _CONST char *s;
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register _SIZET n;
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register int uc;
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if (size <= 0) return( (void *) NULL);
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s = (char *) src;
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d = (char *) dst;
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uc = UNSCHAR(ucharstop);
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for (n = size; n > 0; n--)
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if (UNSCHAR(*d++ = *s++) == (char) uc) return( (void *) d);
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return( (void *) NULL);
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}
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