File size: 2,709 Bytes
bff4ec7 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | #include "../../string.h"
char *memcpy(char *dest, char *src, int n)
/*@ With bytes
Require all_ascii(bytes) && Zlength(bytes) == n &&
0 <= n && n < INT_MAX &&
CharArray::undef_full(dest, n) * CharArray::full(src, n, bytes)
Ensure __return == dest &&
CharArray::full(dest, n, bytes) * CharArray::full(src, n, bytes)
*/
{
int i = 0;
/*@ Inv Assert
all_ascii(bytes) && Zlength(bytes) == n@pre &&
0 <= n@pre && n@pre < INT_MAX &&
0 <= i && i <= n@pre &&
dest == dest@pre && src == src@pre && n == n@pre &&
CharArray::full(dest@pre, i, sublist(0, i, bytes)) *
CharArray::undef_seg(dest@pre, i, n@pre) *
CharArray::full(src@pre, n@pre, bytes)
*/
while (i < n) {
dest[i] = src[i];
i++;
}
return dest;
}
char *memmove(char *dest, char *src, int n)
/*@ With bytes
Require all_ascii(bytes) && Zlength(bytes) == n &&
0 <= n && n < INT_MAX &&
CharArray::undef_full(dest, n) * CharArray::full(src, n, bytes)
Ensure __return == dest &&
CharArray::full(dest, n, bytes) * CharArray::full(src, n, bytes)
*/
{
if (dest < src) {
int i = 0;
/*@ Inv Assert
all_ascii(bytes) && Zlength(bytes) == n@pre &&
0 <= n@pre && n@pre < INT_MAX &&
0 <= i && i <= n@pre &&
dest == dest@pre && src == src@pre && n == n@pre &&
CharArray::full(dest@pre, i, sublist(0, i, bytes)) *
CharArray::undef_seg(dest@pre, i, n@pre) *
CharArray::full(src@pre, n@pre, bytes)
*/
while (i < n) {
dest[i] = src[i];
i++;
}
} else {
int i = n;
/*@ Inv Assert
all_ascii(bytes) && Zlength(bytes) == n@pre &&
0 <= n@pre && n@pre < INT_MAX &&
0 <= i && i <= n@pre &&
dest == dest@pre && src == src@pre && n == n@pre &&
CharArray::undef_seg(dest@pre, 0, i) *
CharArray::full(dest@pre + i * sizeof(char), n@pre - i,
sublist(i, n@pre, bytes)) *
CharArray::full(src@pre, n@pre, bytes)
*/
while (i > 0) {
i--;
dest[i] = src[i];
}
}
return dest;
}
char *memset(char *s, int c, int n)
/*@ Require 0 <= n && n < INT_MAX &&
0 <= c && c <= 127 &&
CharArray::undef_full(s, n)
Ensure __return == s && CharArray::full(s, n, repeat_Z(c, n))
*/
{
int i = 0;
/*@ Inv Assert
0 <= n@pre && n@pre < INT_MAX &&
0 <= c@pre && c@pre <= 127 &&
0 <= i && i <= n@pre &&
s == s@pre && c == c@pre && n == n@pre &&
CharArray::full(s@pre, i, repeat_Z(c@pre, i)) *
CharArray::undef_seg(s@pre, i, n@pre)
*/
while (i < n) {
s[i] = c;
i++;
}
return s;
}
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