Add stdlib with strtoul()

diff --git a/include/lib/stdlib.h b/include/lib/stdlib.h
new file mode 100644 (file)
index 0000000..f1f1efa
--- /dev/null
+++ b/include/lib/stdlib.h
@@ -0,0 +1,34 @@
+/****************************************************************************
+ *  lib/stdlib.h
+ *
+ * Copyright 2014 Nathael Pajani <nathael.pajani@ed3l.fr>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *************************************************************************** */
+
+#ifndef LIB_STDLIB_H
+#define LIB_STDLIB_H
+
+#include <stdint.h>
+
+/* Simple atoi implementation.
+ * Returns the value convertes from the given string.
+ * Does not check that the base is respected aside for the use of letters in
+ *   number representation.
+ */
+uint32_t strtoul(uint8_t* str, uint8_t base);
+
+#endif /* LIB_STDLIB_H */
+

diff --git a/lib/stdlib.c b/lib/stdlib.c
new file mode 100644 (file)
index 0000000..be3b2b1
--- /dev/null
+++ b/lib/stdlib.c
@@ -0,0 +1,51 @@
+/****************************************************************************
+ *  lib/stdlib.c
+ *
+ * Copyright 2014 Nathael Pajani <nathael.pajani@ed3l.fr>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *************************************************************************** */
+
+#include <stdint.h>
+
+/* Simple atoi implementation.
+ * Returns the value convertes from the given string.
+ * Does not check that the base is respected aside for the use of letters in
+ *   number representation.
+ */
+uint32_t strtoul(uint8_t* str, uint8_t base)
+{
+       uint32_t val = 0;
+       while (*str != '\0') {
+               if (*str >= '0' && *str <= '9') {
+                       val = (val * base) + ((*str) - '0');
+                       str++;
+                       continue;
+               }
+               if (*str >= 'A' && *str <= 'F' && base > 10) {
+                       val = (val * base) + ((*str) - 'A' + 10);
+                       str++;
+                       continue;
+               }
+               if (*str >= 'a' && *str <= 'f' && base > 10) {
+                       val = (val * base) + ((*str) - 'a' + 10);
+                       str++;
+                       continue;
+               }
+               break;
+       }
+       return val;
+}
+