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5.64 kB
| char *strcat(char *dest, char *src) | |
| /*@ With dst_str src_str | |
| Require valid_string(dst_str) && valid_string(src_str) && | |
| string_length(dst_str) + string_length(src_str) + 1 < INT_MAX && | |
| store_string(dest, dst_str) * | |
| CharArray::undef_seg(dest, string_length(dst_str) + 1, | |
| string_length(dst_str) + string_length(src_str) + 1) * | |
| store_string(src, src_str) | |
| Ensure __return == dest && | |
| store_string(dest, app(dst_str, src_str)) * | |
| store_string(src, src_str) | |
| */ | |
| { | |
| int i = 0; | |
| /*@ Inv Assert | |
| valid_string(dst_str) && valid_string(src_str) && | |
| string_length(dst_str) + string_length(src_str) + 1 < INT_MAX && | |
| 0 <= i && i <= string_length(dst_str) && | |
| dest == dest@pre && src == src@pre && | |
| (forall (k: Z), (0 <= k && k < i) => Znth(k, dst_str, 0) != 0) && | |
| store_string(dest@pre, dst_str) * | |
| CharArray::undef_seg(dest@pre, string_length(dst_str) + 1, | |
| string_length(dst_str) + string_length(src_str) + 1) * | |
| store_string(src@pre, src_str) | |
| */ | |
| while (dest[i] != 0) { | |
| i++; | |
| } | |
| int j = 0; | |
| /*@ Inv Assert | |
| valid_string(dst_str) && valid_string(src_str) && | |
| string_length(dst_str) + string_length(src_str) + 1 < INT_MAX && | |
| i == string_length(dst_str) && | |
| 0 <= j && j <= string_length(src_str) && | |
| dest == dest@pre && src == src@pre && | |
| CharArray::full(dest@pre, string_length(dst_str) + j, | |
| app(dst_str, sublist(0, j, src_str))) * | |
| store(dest@pre + (string_length(dst_str) + j) * sizeof(char), char, 0) * | |
| CharArray::undef_seg(dest@pre, string_length(dst_str) + j + 1, | |
| string_length(dst_str) + string_length(src_str) + 1) * | |
| store_string(src@pre, src_str) | |
| */ | |
| while (src[j] != 0) { | |
| /*@ Assert | |
| valid_string(dst_str) && valid_string(src_str) && | |
| string_length(dst_str) + string_length(src_str) + 1 < INT_MAX && | |
| i == string_length(dst_str) && | |
| 0 <= j && j < string_length(src_str) && | |
| dest == dest@pre && src == src@pre && | |
| CharArray::full(dest@pre, string_length(dst_str) + j, | |
| app(dst_str, sublist(0, j, src_str))) * | |
| store(dest@pre + (string_length(dst_str) + j) * sizeof(char), char, 0) * | |
| CharArray::undef_seg(dest@pre, string_length(dst_str) + j + 1, | |
| string_length(dst_str) + string_length(src_str) + 1) * | |
| store_string(src@pre, src_str) | |
| */ | |
| dest[i + j] = src[j]; | |
| j++; | |
| dest[i + j] = 0; | |
| } | |
| return dest; | |
| } | |
| char *strncat(char *dest, char *src, int n) | |
| /*@ With dst_str src_str | |
| Require valid_string(dst_str) && valid_string(src_str) && | |
| 0 <= n && n < INT_MAX && | |
| string_length(dst_str) + n + 1 < INT_MAX && | |
| store_string(dest, dst_str) * | |
| CharArray::undef_seg(dest, string_length(dst_str) + 1, | |
| string_length(dst_str) + n + 1) * | |
| store_string(src, src_str) | |
| Ensure exists out, | |
| strncat_result(dst_str, src_str, n, out) && | |
| __return == dest && | |
| store_string(dest, out) * | |
| CharArray::undef_seg(dest, string_length(out) + 1, | |
| string_length(dst_str) + n + 1) * | |
| store_string(src, src_str) | |
| */ | |
| { | |
| int i = 0; | |
| /*@ Inv Assert | |
| valid_string(dst_str) && valid_string(src_str) && | |
| 0 <= n@pre && n@pre < INT_MAX && | |
| string_length(dst_str) + n@pre + 1 < INT_MAX && | |
| 0 <= i && i <= string_length(dst_str) && | |
| dest == dest@pre && src == src@pre && n == n@pre && | |
| (forall (k: Z), (0 <= k && k < i) => Znth(k, dst_str, 0) != 0) && | |
| store_string(dest@pre, dst_str) * | |
| CharArray::undef_seg(dest@pre, string_length(dst_str) + 1, | |
| string_length(dst_str) + n@pre + 1) * | |
| store_string(src@pre, src_str) | |
| */ | |
| while (dest[i] != 0) { | |
| i++; | |
| } | |
| int j = 0; | |
| /*@ Inv Assert | |
| valid_string(dst_str) && valid_string(src_str) && | |
| 0 <= n@pre && n@pre < INT_MAX && | |
| string_length(dst_str) + n@pre + 1 < INT_MAX && | |
| i == string_length(dst_str) && | |
| 0 <= j && j <= n@pre && j <= string_length(src_str) && | |
| dest == dest@pre && src == src@pre && n == n@pre && | |
| CharArray::full(dest@pre, string_length(dst_str) + j, | |
| app(dst_str, sublist(0, j, src_str))) * | |
| store(dest@pre + (string_length(dst_str) + j) * sizeof(char), char, 0) * | |
| CharArray::undef_seg(dest@pre, string_length(dst_str) + j + 1, | |
| string_length(dst_str) + n@pre + 1) * | |
| store_string(src@pre, src_str) | |
| */ | |
| while (j < n && src[j] != 0) { | |
| /*@ Assert | |
| valid_string(dst_str) && valid_string(src_str) && | |
| 0 <= n@pre && n@pre < INT_MAX && | |
| string_length(dst_str) + n@pre + 1 < INT_MAX && | |
| i == string_length(dst_str) && | |
| 0 <= j && j < n@pre && j < string_length(src_str) && | |
| dest == dest@pre && src == src@pre && n == n@pre && | |
| CharArray::full(dest@pre, string_length(dst_str) + j, | |
| app(dst_str, sublist(0, j, src_str))) * | |
| store(dest@pre + (string_length(dst_str) + j) * sizeof(char), char, 0) * | |
| CharArray::undef_seg(dest@pre, string_length(dst_str) + j + 1, | |
| string_length(dst_str) + n@pre + 1) * | |
| store_string(src@pre, src_str) | |
| */ | |
| dest[i + j] = src[j]; | |
| j++; | |
| dest[i + j] = 0; | |
| } | |
| return dest; | |
| } | |