1// RUN: %check_clang_tidy %s bugprone-not-null-terminated-result %t -- \
2// RUN: -config="{CheckOptions: \
3// RUN: {bugprone-not-null-terminated-result.WantToUseSafeFunction: true}}" \
4// RUN: -- -std=c11 -I %S/Inputs/not-null-terminated-result
5
6#include "not-null-terminated-result-c.h"
7
8// The following is not defined therefore the safe functions are unavailable.
9// #define __STDC_LIB_EXT1__ 1
10
11#define __STDC_WANT_LIB_EXT1__ 1
12
13//===----------------------------------------------------------------------===//
14// memcpy() - destination array tests
15//===----------------------------------------------------------------------===//
16
17void bad_memcpy_not_just_char_dest(const char *src) {
18 unsigned char dest00[13];
19 memcpy(dest00, src, strlen(src));
20 // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: the result from calling 'memcpy' is not null-terminated [bugprone-not-null-terminated-result]
21 // CHECK-FIXES: unsigned char dest00[14];
22 // CHECK-FIXES-NEXT: strcpy((char *)dest00, src);
23}
24
25void good_memcpy_not_just_char_dest(const char *src) {
26 unsigned char dst00[14];
27 strcpy((char *)dst00, src);
28}
29
30void bad_memcpy_known_dest(const char *src) {
31 char dest01[13];
32 memcpy(dest01, src, strlen(src));
33 // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: the result from calling 'memcpy' is not null-terminated [bugprone-not-null-terminated-result]
34 // CHECK-FIXES: strcpy(dest01, src);
35}
36
37void good_memcpy_known_dest(const char *src) {
38 char dst01[13];
39 strcpy(dst01, src);
40}
41
42//===----------------------------------------------------------------------===//
43// memcpy() - length tests
44//===----------------------------------------------------------------------===//
45
46void bad_memcpy_full_source_length(const char *src) {
47 char dest20[13];
48 memcpy(dest20, src, strlen(src));
49 // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: the result from calling 'memcpy' is not null-terminated [bugprone-not-null-terminated-result]
50 // CHECK-FIXES: strcpy(dest20, src);
51}
52
53void good_memcpy_full_source_length(const char *src) {
54 char dst20[13];
55 strcpy(dst20, src);
56}
57
58void bad_memcpy_partial_source_length(const char *src) {
59 char dest21[13];
60 memcpy(dest21, src, strlen(src) - 1);
61 // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: the result from calling 'memcpy' is not null-terminated [bugprone-not-null-terminated-result]
62 // CHECK-FIXES: strncpy(dest21, src, strlen(src) - 1);
63 // CHECK-FIXES-NEXT: dest21[strlen(src) - 1] = '\0';
64}
65
66void good_memcpy_partial_source_length(const char *src) {
67 char dst21[13];
68 strncpy(dst21, src, strlen(src) - 1);
69 dst21[strlen(src) - 1] = '\0';
70}
71

source code of clang-tools-extra/test/clang-tidy/checkers/bugprone/not-null-terminated-result-memcpy-before-safe.c