PV-Bench / benchmarks /Engineering /string /strcpy /rocq /solution_annotated.c
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#include "../../string.h"
char *strcpy(char *dest, char *src)
/*@ With src_str
Require valid_string(src_str) &&
string_length(src_str) < INT_MAX &&
CharArray::undef_full(dest, string_length(src_str) + 1) *
store_string(src, src_str)
Ensure __return == dest &&
store_string(dest, src_str) * store_string(src, src_str)
*/
{
int i = 0;
/*@ Inv Assert
valid_string(src_str) &&
string_length(src_str) < INT_MAX &&
0 <= i && i <= string_length(src_str) &&
dest == dest@pre && src == src@pre &&
CharArray::full(dest@pre, i, sublist(0, i, src_str)) *
CharArray::undef_seg(dest@pre, i, string_length(src_str) + 1) *
store_string(src@pre, src_str)
*/
while (src[i] != 0) {
dest[i] = src[i];
i++;
}
dest[i] = 0;
return dest;
}
char *strncpy(char *dest, char *src, int n)
/*@ With src_str
Require valid_string(src_str) &&
0 <= n && n < INT_MAX &&
CharArray::undef_full(dest, n) *
store_string(src, src_str)
Ensure exists out,
strncpy_content(src_str, n, out) &&
__return == dest &&
CharArray::full(dest, n, out) * store_string(src, src_str)
*/
{
int i = 0;
/*@ Inv Assert
valid_string(src_str) &&
0 <= n@pre && n@pre < INT_MAX &&
0 <= i && i <= n@pre && i <= string_length(src_str) &&
dest == dest@pre && src == src@pre && n == n@pre &&
CharArray::full(dest@pre, i, sublist(0, i, src_str)) *
CharArray::undef_seg(dest@pre, i, n@pre) *
store_string(src@pre, src_str)
*/
while (i < n && src[i] != 0) {
dest[i] = src[i];
i++;
}
/*@ Inv Assert
exists out,
valid_string(src_str) &&
0 <= n@pre && n@pre < INT_MAX &&
0 <= i && i <= n@pre &&
strncpy_content(src_str, i, out) &&
(i < n@pre => string_length(src_str) <= i) &&
dest == dest@pre && src == src@pre && n == n@pre &&
CharArray::full(dest@pre, i, out) *
CharArray::undef_seg(dest@pre, i, n@pre) *
store_string(src@pre, src_str)
*/
while (i < n) {
dest[i] = 0;
i++;
}
return dest;
}