1 files changed, 36 insertions, 0 deletions
diff --git a/src/stdlib/fpconv.h b/src/stdlib/fpconv.h
new file mode 100644
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+++ b/src/stdlib/fpconv.h
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+#ifndef FPCONV_H
+#define FPCONV_H
+
+// This file defines a function to convert floating point numbers to strings.
+// For license, see: fpconv_license.txt
+
+/* Fast and accurate double to string conversion based on Florian Loitsch's
+ * Grisu-algorithm[1].
+ *
+ * Input:
+ * fp -> the double to convert, dest -> destination buffer.
+ * The generated string will never be longer than 24 characters.
+ * Make sure to pass a pointer to at least 24 bytes of memory.
+ * The emitted string will not be null terminated.
+ *
+ * Output:
+ * The number of written characters.
+ *
+ * Exemplary usage:
+ *
+ * void print(double d)
+ * {
+ *      char buf[24 + 1] // plus null terminator
+ *      int str_len = fpconv_dtoa(d, buf);
+ *
+ *      buf[str_len] = '\0';
+ *      printf("%s", buf);
+ * }
+ *
+ */
+
+int fpconv_dtoa(double fp, char dest[24]);
+
+#endif
+
+/* [1] http://florian.loitsch.com/publications/dtoa-pldi2010.pdf */