diff options
| -rw-r--r-- | binary.h | 18 |
1 files changed, 16 insertions, 2 deletions
@@ -2,8 +2,10 @@ #include <string.h> #include <stdint.h> +#define BIT_UINTMAXBITS (sizeof(uintmax_t) * CHAR_BIT) + #define BIN_BIT(_s, _b) (\ - sizeof(_s) > (_b+1) || (_b+1) > sizeof(uintmax_t) * CHAR_BIT ? \ + sizeof(_s) > (_b + 1) || (_b + 1) > BIT_UINTMAXBITS ? \ (uintmax_t)0 : \ _s[sizeof(_s)-(_b+1)] == '0' ? \ (uintmax_t)0 : \ @@ -33,8 +35,20 @@ static uintmax_t binfromstr(const char *s) { - char array[sizeof(uintmax_t) * CHAR_BIT + 1]; + char array[BIT_UINTMAXBITS + 1]; memset(array, '0', sizeof(array)); strcpy(array + (sizeof(array) - strlen(s)) - 1, s); return BIN_FROM_ARRAY(array); } + +static char *binstr(size_t n, char s[n], uintmax_t b) +{ + memset(s, '0', n); + s[n - 1] = '\0'; + for (size_t i = 0; i < n && i < BIT_UINTMAXBITS; i++) { + if (b & (1 << i)) { + s[n - (i + 1)] = '1'; + } + } + return s; +} |