xref: /llvm-project/clang-tools-extra/test/clang-tidy/checkers/bugprone/not-null-terminated-result-memcpy-safe-other.c (revision 89a1d03e2b379e325daa5249411e414bbd995b5e)

// RUN: %check_clang_tidy %s bugprone-not-null-terminated-result %t -- \
// RUN: -- -std=c11 -I %S/Inputs/not-null-terminated-result

#include "not-null-terminated-result-c.h"

#define __STDC_LIB_EXT1__ 1
#define __STDC_WANT_LIB_EXT1__ 1

#define SRC_LENGTH 3
#define SRC "foo"

//===----------------------------------------------------------------------===//
// False positive suppression.
//===----------------------------------------------------------------------===//

void good_memcpy_known_src(void) {
  char dest[13];
  char src[] = "foobar";
  memcpy(dest, src, sizeof(src));
}

void good_memcpy_null_terminated(const char *src) {
  char dest[13];
  const int length = strlen(src);
  memcpy(dest, src, length);
  dest[length] = '\0';
}

void good_memcpy_proper_length(const char *src) {
  char *dest = 0;
  int length = strlen(src) + 1;
  dest = (char *)malloc(length);
  memcpy(dest, src, length);
}

void may_bad_memcpy_unknown_length(const char *src, int length) {
  char dest[13];
  memcpy(dest, src, length);
}

void may_bad_memcpy_const_length(const char *src) {
  char dest[13];
  memcpy(dest, src, 12);
}

//===----------------------------------------------------------------------===//
// Special cases.
//===----------------------------------------------------------------------===//

void bad_memcpy_unknown_dest(char *dest01, const char *src) {
  memcpy(dest01, src, strlen(src));
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: the result from calling 'memcpy' is not null-terminated [bugprone-not-null-terminated-result]
  // CHECK-FIXES: strcpy(dest01, src);
}

void good_memcpy_unknown_dest(char *dst01, const char *src) {
  strcpy(dst01, src);
}

void bad_memcpy_variable_array(int dest_length) {
  char dest02[dest_length + 1];
  memcpy(dest02, "foobarbazqux", strlen("foobarbazqux"));
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: the result from calling 'memcpy' is not null-terminated [bugprone-not-null-terminated-result]
  // CHECK-FIXES: strcpy(dest02, "foobarbazqux");
}

void good_memcpy_variable_array(int dest_length) {
  char dst02[dest_length + 1];
  strcpy(dst02, "foobarbazqux");
}

void bad_memcpy_equal_src_length_and_length(void) {
  char dest03[13];
  const char *src = "foobarbazqux";
  memcpy(dest03, src, 12);
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: the result from calling 'memcpy' is not null-terminated [bugprone-not-null-terminated-result]
  // CHECK-FIXES: strcpy(dest03, src);
}

void good_memcpy_equal_src_length_and_length(void) {
  char dst03[13];
  const char *src = "foobarbazqux";
  strcpy(dst03, src);
}

void bad_memcpy_dest_size_overflows(const char *src) {
  const int length = strlen(src);
  char *dest04 = (char *)malloc(length);
  memcpy(dest04, src, length);
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: the result from calling 'memcpy' is not null-terminated [bugprone-not-null-terminated-result]
  // CHECK-FIXES: char *dest04 = (char *)malloc(length + 1);
  // CHECK-FIXES-NEXT: strcpy(dest04, src);
}

void good_memcpy_dest_size_overflows(const char *src) {
  const int length = strlen(src);
  char *dst04 = (char *)malloc(length + 1);
  strcpy(dst04, src);
}

void bad_memcpy_macro(void) {
  char dest05[SRC_LENGTH];
  memcpy(dest05, SRC, SRC_LENGTH);
  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: the result from calling 'memcpy' is not null-terminated [bugprone-not-null-terminated-result]
  // CHECK-FIXES: char dest05[SRC_LENGTH + 1];
  // CHECK-FIXES-NEXT: strcpy(dest05, SRC);
}

void good_memcpy_macro(void) {
  char dst05[SRC_LENGTH + 1];
  strcpy(dst05, SRC);
}