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Diffstat (limited to 'src/mlibc/stdlib/itoa.c')
| -rw-r--r-- | src/mlibc/stdlib/itoa.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/mlibc/stdlib/itoa.c b/src/mlibc/stdlib/itoa.c new file mode 100644 index 0000000..e9c40c1 --- /dev/null +++ b/src/mlibc/stdlib/itoa.c @@ -0,0 +1,43 @@ +#include <mlibc/math.h> +#include <stdint.h> +#include <mlibc/string.h> +#include <mlibc/stdlib.h> + +static const char __ITOA_TABLE[] = "0123456789"; + +char *itoa(int n) { + // Special cases + if (!n) { + char *ret = kmalloc(2); + ret[0] = '0'; + ret[1] = 0; + return ret; + } + uint8_t negative = (uint8_t) (n < 0); + if (negative) n *= -1; + + // First get the number of digits. + int sz; + for (sz = 0; n % pow(10, sz) != n; sz++) {} + + char *ret = kmalloc(sz + 1); + + // Iterate all digits again. + for (int i = 0; i < sz; i++) { + int digit = (n % pow(10, i + 1)) / pow(10, i); + ret[i] = __ITOA_TABLE[digit]; + } + ret[sz] = 0; + + if (negative) { + char *aux = kmalloc(sz + 2); + strcpy(aux, ret); + aux[sz] = '-'; + aux[sz + 1] = 0; + kfree(ret); + ret = aux; + } + + strinv(ret); + return ret; +}
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