MUCH work in libc

Also cleaned up some syscalls etc

1 files changed, 43 insertions, 0 deletions

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 <stdint.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+
+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