Added userspace libc and began userspace based shell

1 files changed, 23 insertions, 0 deletions

diff --git a/src/kernel/lib/stdlib/htoi.c b/src/kernel/lib/stdlib/htoi.c
new file mode 100644
index 0000000..f2d4702
--- /dev/null
+++ b/src/kernel/lib/stdlib/htoi.c
@@ -0,0 +1,23 @@
+#include <kernel/lib/math.h>
+#include <stddef.h>
+#include <kernel/lib/string.h>
+
+int htoi(char *str)
+{
+    size_t s_str = strlen(str);
+
+    size_t i = 0;
+    int ret = 0;
+    for (; i < s_str; i++) {
+        char c = str[i];
+        int aux = 0;
+        if (c >= '0' && c <= '9')
+            aux = c - '0';
+        else if (c >= 'A' && c <= 'F')
+            aux = (c - 'A') + 10;
+
+        ret += aux * pow(16, (s_str - i) - 1);
+    }
+
+    return ret;
+}
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