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Annotation of researchv10no/cmd/u9fs/memmove.c, revision 1.1.1.1

1.1       root        1: #include "u.h"
                      2: #include <sys/types.h>
                      3: #include <sys/stat.h>
                      4: #include "libc.h"
                      5: 
                      6: /*
                      7:  * Portable version for systems from the ancien regime
                      8:  */
                      9: 
                     10: void*
                     11: memmove(void *a1, void *a2, Ulong n)
                     12: {
                     13:        char *s1, *s2;
                     14: 
                     15:        if(a1 > a2)
                     16:                goto back;
                     17:        s1 = a1;
                     18:        s2 = a2;
                     19:        while(n > 0) {
                     20:                *s1++ = *s2++;
                     21:                n--;
                     22:        }
                     23:        return a1;
                     24: 
                     25: back:
                     26:        s1 = (char*)a1 + n;
                     27:        s2 = (char*)a2 + n;
                     28:        while(n > 0) {
                     29:                *--s1 = *--s2;
                     30:                n--;
                     31:        }
                     32:        return a1;
                     33: }

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