From d94b024b73aeca06de417e0fd3c502495312a8b2 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Sat, 7 Dec 2019 13:40:28 +0100
Subject: Added userspace libc and began userspace based shell

---
 src/userspace/mlibc/stdlib/itoa.c | 47 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 src/userspace/mlibc/stdlib/itoa.c

(limited to 'src/userspace/mlibc/stdlib/itoa.c')

diff --git a/src/userspace/mlibc/stdlib/itoa.c b/src/userspace/mlibc/stdlib/itoa.c
new file mode 100644
index 0000000..55c1383
--- /dev/null
+++ b/src/userspace/mlibc/stdlib/itoa.c
@@ -0,0 +1,47 @@
+#include <stdint.h>
+#include <mlibc/math.h>
+#include <mlibc/string.h>
+#include <mlibc/stdlib.h>
+
+static const char __ITOA_TABLE[] = "0123456789";
+
+char *itoa(int n)
+{
+    //if (paging_enabled == 0)
+    //    return "0"; // kmalloc isn't available
+
+    if (!n) {
+        char *ret = 0;
+        //kmalloc(2);
+        ret[0] = '0';
+        ret[1] = 0;
+        return ret;
+    }
+    uint8_t negative = (uint8_t) (n < 0);
+    if (negative) n *= -1;
+
+    int sz;
+    for (sz = 0; n % pow(10, sz) != n; sz++) {}
+
+    char *ret = 0;
+    //kmalloc(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 = 0;
+        //kmalloc(sz + 2);
+        strcpy(aux, ret);
+        aux[sz] = '-';
+        aux[sz + 1] = 0;
+        // kfree(ret);
+        ret = aux;
+    }
+
+    strinv(ret);
+    return ret;
+}
\ No newline at end of file
-- 
cgit v1.2.3