add atof

Signed-off-by: Mattias Andrée <maandree@operamail.com>

2 files changed, 53 insertions, 0 deletions

diff --git a/include/stdlib.h b/include/stdlib.h
index 4aa95f2..1244060 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -134,6 +134,21 @@ char* relpath(const char*, const char*)
 
 
 /**
+ * Convert a string to a floating-point value,
+ * without checking for errors.
+ * 
+ * Note that, the behaviour is unspecified
+ * if the string contains anything else than
+ * digits, either a leading '-' (hyphen)
+ * or a leading plus, and at most one '.'.
+ * 
+ * @param   string  The string to convert.
+ * @return          The number encoded by the string.
+ */
+double atof(const char*)
+  __GCC_ONLY(__attribute__((warn_unused_result, nonnull, pure)));
+
+/**
  * Convert a string to an integer,
  * without checking for errors.
  * 
diff --git a/src/stdlib/atof.c b/src/stdlib/atof.c
new file mode 100644
index 0000000..c5a4182
--- /dev/null
+++ b/src/stdlib/atof.c
@@ -0,0 +1,38 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * 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 3 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 <stdlib.h>
+
+
+
+/**
+ * Convert a string to a floating-point value,
+ * without checking for errors.
+ * 
+ * Note that, the behaviour is unspecified
+ * if the string contains anything else than
+ * digits, either a leading '-' (hyphen)
+ * or a leading plus, and at most one '.'.
+ * 
+ * @param   string  The string to convert.
+ * @return          The number encoded by the string.
+ */
+double atof(const char* string)
+{
+  return strtod(string, NULL);
+}
+