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+PR_dtoa
+=======
+
+Converts a floating point number to a string.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prdtoa.h>
+
+   PRStatus PR_dtoa(
+      PRFloat64 d,
+      PRIntn mode,
+      PRIntn ndigits,
+      PRIntn *decpt,
+      PRIntn *sign,
+      char **rve,
+      char *buf,
+      PRSize bufsz);
+
+
+Parameters
+~~~~~~~~~~
+
+The function has these parameters:
+
+``d``
+   The floating point number to be converted to a string.
+``mode``
+   The type of conversion to employ.
+``ndigits``
+   The number of digits desired in the output string.
+``decpt``
+   A pointer to a memory location where the runtime will store the
+   offset, relative to the beginning of the output string, of the
+   conversion's decimal point.
+``sign``
+   A location where the runtime can store an indication that the
+   conversion was of a negative value.
+``*rve``
+   If not ``NULL`` this location is set to the address of the end of the
+   result.
+``buf``
+   The address of the buffer in which to store the result.
+``bufsz``
+   The size of the buffer provided to hold the result.
+
+Results
+~~~~~~~
+
+The principle output is the null-terminated string stored in ``buf``. If
+``rve`` is not ``NULL``, ``*rve`` is set to point to the end of the
+returned value.
+
+
+Description
+-----------
+
+This function converts the specified floating point number to a string,
+using the method specified by ``mode``. Possible modes are:
+
+``0``
+   Shortest string that yields ``d`` when read in and rounded to
+   nearest.
+``1``
+   Like 0, but with Steele & White stopping rule. For example, with IEEE
+   754 arithmetic, mode 0 gives 1e23 whereas mode 1 gives
+   9.999999999999999e22.
+``2``
+   ``max(1, ndigits)`` significant digits. This gives a return value
+   similar to that of ``ecvt``, except that trailing zeros are
+   suppressed.
+``3``
+   Through ``ndigits`` past the decimal point. This gives a return value
+   similar to that from ``fcvt``, except that trailing zeros are
+   suppressed, and ``ndigits`` can be negative.
+``4,5,8,9``
+   Same as modes 2 and 3, but using\ *left to right* digit generation.
+``6-9``
+   Same as modes 2 and 3, but do not try fast floating-point estimate
+   (if applicable).
+``all others``
+   Treated as mode 2.
+
+Upon return, the buffer specified by ``buf`` and ``bufsz`` contains the
+converted string. Trailing zeros are suppressed. Sufficient space is
+allocated to the return value to hold the suppressed trailing zeros.
+
+If the input parameter ``d`` is\ *+Infinity*,\ *-Infinity* or\ *NAN*,
+``*decpt`` is set to 9999.