comparison: src/cx/common.h
src/cx/common.h
- changeset 970
- c9b02747cfc5
- parent 959
- 0e1bf3c199bf
equal
deleted
inserted
replaced
| 969:72e5432f6b42 | 970:c9b02747cfc5 |
|---|---|
| 124 * @param arr the array identifier | 124 * @param arr the array identifier |
| 125 * @return the number of elements | 125 * @return the number of elements |
| 126 */ | 126 */ |
| 127 #define cx_nmemb(arr) (sizeof(arr)/sizeof((arr)[0])) | 127 #define cx_nmemb(arr) (sizeof(arr)/sizeof((arr)[0])) |
| 128 | 128 |
| 129 // cx_szmul() definition | |
| 130 #if (__GNUC__ >= 5 || defined(__clang__)) && !defined(CX_NO_SZMUL_BUILTIN) | |
| 131 #define CX_SZMUL_BUILTIN | |
| 132 | |
| 133 /** | |
| 134 * Alias for \c __builtin_mul_overflow. | |
| 135 * | |
| 136 * Performs a multiplication of size_t values and checks for overflow. | |
| 137 * | |
| 138 * @param a first operand | |
| 139 * @param b second operand | |
| 140 * @param result a pointer to a size_t, where the result should | |
| 141 * be stored | |
| 142 * @return zero, if no overflow occurred and the result is correct, non-zero | |
| 143 * otherwise | |
| 144 */ | |
| 145 #define cx_szmul(a, b, result) __builtin_mul_overflow(a, b, result) | |
| 146 | |
| 147 #else // no GNUC or clang bultin | |
| 148 | |
| 149 /** | |
| 150 * Performs a multiplication of size_t values and checks for overflow. | |
| 151 * | |
| 152 * @param a first operand | |
| 153 * @param b second operand | |
| 154 * @param result a pointer to a size_t, where the result should | |
| 155 * be stored | |
| 156 * @return zero, if no overflow occurred and the result is correct, non-zero | |
| 157 * otherwise | |
| 158 */ | |
| 159 #define cx_szmul(a, b, result) cx_szmul_impl(a, b, result) | |
| 160 | |
| 161 /** | |
| 162 * Performs a multiplication of size_t values and checks for overflow. | |
| 163 * | |
| 164 * This is a custom implementation in case there is no compiler builtin | |
| 165 * available. | |
| 166 * | |
| 167 * @param a first operand | |
| 168 * @param b second operand | |
| 169 * @param result a pointer to a size_t where the result should be stored | |
| 170 * @return zero, if no overflow occurred and the result is correct, non-zero | |
| 171 * otherwise | |
| 172 */ | |
| 173 int cx_szmul_impl(size_t a, size_t b, size_t *result); | |
| 174 | |
| 175 #endif // cx_szmul | |
| 176 | |
| 129 // Compiler specific stuff | 177 // Compiler specific stuff |
| 130 | 178 |
| 131 #ifndef __GNUC__ | 179 #ifndef __GNUC__ |
| 132 /** | 180 /** |
| 133 * Removes GNU C attributes where they are not supported. | 181 * Removes GNU C attributes where they are not supported. |
