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Annotation of researchv10dc/libc/gen/memmove.c, revision 1.1.1.1

1.1       root        1: /* Copyright AT&T Bell Laboratories, 1993 */
                      2: #include <stddef.h>
                      3: 
                      4: extern void *memcpy(void*, void*, size_t);
                      5: 
                      6: void *
                      7: memmove(void *to, void *from, register size_t n)
                      8: {
                      9:        register char *out = to;
                     10:        register char *in = from;
                     11: 
                     12:        if(n <= 0)      /* works if size_t is signed or not */
                     13:                ;
                     14:        else if(in + n <= out || out + n <= in)
                     15:                return(memcpy(to, from, n));    /* hope it's fast*/
                     16:        else if(out < in)
                     17:                do
                     18:                        *out++ = *in++;
                     19:                while(--n > 0);
                     20:        else {
                     21:                out += n;
                     22:                in += n;
                     23:                do
                     24:                        *--out = *--in;
                     25:                while(--n > 0);
                     26:        }
                     27:        return(to);
                     28: }

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