comparison: src/cx/utils.h
src/cx/utils.h
- changeset 970
- c9b02747cfc5
- parent 962
- cd418898af5c
equal
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inserted
replaced
| 969:72e5432f6b42 | 970:c9b02747cfc5 |
|---|---|
| 42 #include "common.h" | 42 #include "common.h" |
| 43 | 43 |
| 44 #ifdef __cplusplus | 44 #ifdef __cplusplus |
| 45 extern "C" { | 45 extern "C" { |
| 46 #endif | 46 #endif |
| 47 | |
| 48 // cx_szmul() definition | |
| 49 | |
| 50 #if (__GNUC__ >= 5 || defined(__clang__)) && !defined(CX_NO_SZMUL_BUILTIN) | |
| 51 #define CX_SZMUL_BUILTIN | |
| 52 | |
| 53 /** | |
| 54 * Alias for \c __builtin_mul_overflow. | |
| 55 * | |
| 56 * Performs a multiplication of size_t values and checks for overflow. | |
| 57 * | |
| 58 * @param a first operand | |
| 59 * @param b second operand | |
| 60 * @param result a pointer to a size_t, where the result should | |
| 61 * be stored | |
| 62 * @return zero, if no overflow occurred and the result is correct, non-zero | |
| 63 * otherwise | |
| 64 */ | |
| 65 #define cx_szmul(a, b, result) __builtin_mul_overflow(a, b, result) | |
| 66 | |
| 67 #else // no GNUC or clang bultin | |
| 68 | |
| 69 /** | |
| 70 * Performs a multiplication of size_t values and checks for overflow. | |
| 71 * | |
| 72 * @param a first operand | |
| 73 * @param b second operand | |
| 74 * @param result a pointer to a size_t, where the result should | |
| 75 * be stored | |
| 76 * @return zero, if no overflow occurred and the result is correct, non-zero | |
| 77 * otherwise | |
| 78 */ | |
| 79 #define cx_szmul(a, b, result) cx_szmul_impl(a, b, result) | |
| 80 | |
| 81 /** | |
| 82 * Performs a multiplication of size_t values and checks for overflow. | |
| 83 * | |
| 84 * This is a custom implementation in case there is no compiler builtin | |
| 85 * available. | |
| 86 * | |
| 87 * @param a first operand | |
| 88 * @param b second operand | |
| 89 * @param result a pointer to a size_t where the result should be stored | |
| 90 * @return zero, if no overflow occurred and the result is correct, non-zero | |
| 91 * otherwise | |
| 92 */ | |
| 93 int cx_szmul_impl(size_t a, size_t b, size_t *result); | |
| 94 | |
| 95 #endif // cx_szmul | |
| 96 | |
| 97 | 47 |
| 98 /** | 48 /** |
| 99 * Reads data from a stream and writes it to another stream. | 49 * Reads data from a stream and writes it to another stream. |
| 100 * | 50 * |
| 101 * @param src the source stream | 51 * @param src the source stream |
