Reading numbers from an input stream without using the Lisp reader.
read-integer (&optional input-stream eof-error-p eof-value recursive-p &key unsigned-number plus-sign minus-sign radix)
Read an integer from an input stream.
read-float (&optional input-stream eof-error-p eof-value recursive-p &key unsigned-number plus-sign minus-sign decimal-point exponent-marker float-format)
Read a floating-point number from an input stream.
Optional arguments input-stream, eof-error-p, eof-value, and recursive-p behave similar to
Keyword argument unsigned-number controls the sign conventions; plus or minus sign, minus sign only (no explicit plus sign), or unsigned.
Keyword arguments plus-sign, minus-sign, decimal-point, and exponent-marker denote character sets.
Leading and trailing whitespace is not ignored.
read-float functions are designed to read
external number representations. The
read-number function (to be
defined) is reserved for reading any Lisp number representation.