meta: move photon/libc to root

libc/stdlib/strtof.c

@@ -0,0 +1,33 @@
+#include <ctype.h>
+
+float strtof(const char *str, char **endptr)
+{
+    float res = 0.0F;
+    char *ptr = (char*)str;
+    int after_dot = 0;
+    float div = 1;
+
+    while (*ptr != '\0') {
+        if (isdigit(*ptr)) {
+            if (!after_dot) {
+                res *= 10;
+                res += *ptr - '0';
+            } else {
+                div *= 10;
+                res += (float)(*ptr - '0') / div;
+            }
+        } else if (*ptr == '.') {
+            after_dot = 1;
+        } else {
+            break;
+        }
+
+        ptr++;
+    }
+
+    if (endptr) {
+        *endptr = ptr;
+    }
+
+    return res;
+}