2 files changed, 94 insertions, 0 deletions
diff --git a/rushs/tinyprintf/my_atoi_base/my_atoi_base.c b/rushs/tinyprintf/my_atoi_base/my_atoi_base.c
new file mode 100644
index 0000000..46b4560
--- /dev/null
+++ b/rushs/tinyprintf/my_atoi_base/my_atoi_base.c
@@ -0,0 +1,86 @@
+#include "my_atoi_base.h"
+
+int val_in_base(char c, const char *base)
+{
+    size_t i;
+    for (i = 0; base[i] && base[i] != c; i++)
+    {
+        continue;
+    }
+
+    if (base[i])
+    {
+        return i;
+    }
+
+    return -1;
+}
+
+int base_size(const char *base)
+{
+    int res;
+    for (res = 0; base[res]; res++)
+    {
+        continue;
+    }
+    return res;
+}
+
+int my_atoi_base(const char *str, const char *base)
+{
+    int res = 0;
+
+    // str error check
+    if (str == NULL || *str == '0')
+    {
+        return 0;
+    }
+
+    // trim whitespaces
+    for (; *str && *str == ' '; str++)
+    {
+        continue;
+    }
+
+    // move to end of str
+    size_t l;
+    for (l = 0; str[l]; l++)
+    {
+        continue;
+    }
+    l--;
+
+    // prepare for calculations
+    int b = base_size(base);
+    int factor = 1;
+
+    // actual conversion of up to the second element of str (potential sign)
+    for (; l > 0; l--)
+    {
+        int val = val_in_base(str[l], base);
+        if (val == -1)
+        {
+            return 0;
+        }
+        res += val * factor;
+
+        factor *= b;
+    }
+
+    // l should be 0 by now
+    if (str[l] == '-')
+    {
+        return -res;
+    }
+    else if (str[l] != '+')
+    {
+        int val = val_in_base(str[l], base);
+        if (val == -1)
+        {
+            return 0;
+        }
+        return res + val * factor;
+    }
+
+    return res;
+}
diff --git a/rushs/tinyprintf/my_atoi_base/my_atoi_base.h b/rushs/tinyprintf/my_atoi_base/my_atoi_base.h
new file mode 100644
index 0000000..296ae23
--- /dev/null
+++ b/rushs/tinyprintf/my_atoi_base/my_atoi_base.h
@@ -0,0 +1,8 @@
+#ifndef MY_ATOI_BASE_H
+#define MY_ATOI_BASE_H
+
+#include <stddef.h>
+
+int my_atoi_base(const char *str, const char *base);
+
+#endif /* ! MY_ATOI_BASE_H */