From 4546c75d685475d8b9f215b588364e1d1bbd0b79 Mon Sep 17 00:00:00 2001 From: Marvin Borner Date: Wed, 29 Apr 2020 19:21:29 +0200 Subject: MUCH work in libc Also cleaned up some syscalls etc --- src/userspace/libc/stdlib/itoa.c | 43 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 src/userspace/libc/stdlib/itoa.c (limited to 'src/userspace/libc/stdlib/itoa.c') diff --git a/src/userspace/libc/stdlib/itoa.c b/src/userspace/libc/stdlib/itoa.c new file mode 100644 index 0000000..8311ad1 --- /dev/null +++ b/src/userspace/libc/stdlib/itoa.c @@ -0,0 +1,43 @@ +#include +#include +#include +#include + +static const char ITOA_TABLE[] = "0123456789"; + +char *itoa(int n) +{ + if (!n) { + char *ret = (char *)malloc(2); + ret[0] = '0'; + ret[1] = 0; + return ret; + } + u8 negative = (u8)(n < 0); + if (negative) + n *= -1; + + int sz; + for (sz = 0; n % pow(10, sz) != n; sz++) { + } + + char *ret = (char *)malloc((u32)(sz + 1)); + + 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 = (char *)malloc((u32)(sz + 2)); + strcpy(aux, ret); + aux[sz] = '-'; + aux[sz + 1] = 0; + free(ret); + ret = aux; + } + + strinv(ret); + return ret; +} \ No newline at end of file -- cgit v1.2.3