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# Copyright (C) 2016 Rene Nielsen <rene.nielsen@microsemi.com>
# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
#include <string.h>
#include <stdio.h>
#define LEN 1024
int main(int argc, char *argv[])
{
unsigned char a[LEN], exp;
int i, move_len, move_src, err = 0;
// Fill the array with increasing values from 0 to LEN - 1 (wrap is fine)
for (i = 0; i < LEN; i++) {
a[i] = i;
}
// move_src is the index into the array to move from.
// move_len is the number of indices to move. Here, we take the remainder.
move_src = LEN / 64;
move_len = LEN - move_src;
printf("Moving %d entries from index %d to 0\n", move_len, move_src);
memmove(a, &a[move_src], sizeof(a[0]) * move_len);
// Check that the memmove went well
for (i = 0; i < LEN; i++) {
// Expect that the first #move_len entries contain increasing values
// starting at #move_src and the last #move_src entries are untouched.
exp = i >= move_len ? i : i + move_src;
if (a[i] != exp) {
printf("Error: memmove() failed. Expected a[%d] = %u, got %u\n", i, exp, a[i]);
err = 1;
}
}
if (!err) {
printf("memmove() succeeded\n");
}
return err;
}
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