swapc_bytes.c

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#include <string.h>
#include <stdlib.h>
 
int swapc_bytes(char *in, int nbyte, int ntime) {
    char *tmpbuf, *ptr;
    int i, j, k;
 
    tmpbuf = (char *) malloc(nbyte);
    ptr = in;
 
    for (j = 0; j < ntime; j++) {
        for (i = 0, k = nbyte - 1; i < nbyte; i++, k--)
            tmpbuf[i] = ptr[k];
 
        memcpy(ptr, tmpbuf, nbyte);
 
        ptr += nbyte;
    }
    free(tmpbuf);
 
    return 0;
}
 
int swapc_bytes2(const char *in, char *out, int nbyte, int ntime) {
    const char *ptr;
    char *ptr2;
    int i, j, k;
 
    ptr = in;
    ptr2 = out;
 
    for (j = 0; j < ntime; j++) {
        for (i = 0, k = nbyte - 1; i < nbyte; i++, k--)
            ptr2[i] = ptr[k];
 
        ptr += nbyte;
        ptr2 += nbyte;
    }
 
    return 0;
}