Make the Lisp reader and string-to-float more consistent.
* data.c (atof): Remove decl; no longer used or needed. (Fstring_to_number): Use new string_to_float function, to be consistent with how the Lisp reader treats infinities and NaNs. Do not assume that floating-point numbers represent EMACS_INT without losing information; this is not true on most 64-bit hosts. Avoid double-rounding errors, by insisting on integers when parsing non-base-10 numbers, as the documentation specifies. Report integer overflow instead of silently converting to integers. * lisp.h (string_to_float): New decl, replacing ... (isfloat_string): Remove. * lread.c (read1): Do not accept +. and -. as integers; this appears to have been a coding error. Similarly, do not accept strings like +-1e0 as floating point numbers. Do not report overflow for some integer overflows and not others; instead, report them all. Break out the floating-point parsing into a new function string_to_float, so that Fstring_to_number parses floating point numbers consistently with the Lisp reader. (string_to_float): New function, replacing isfloat_string. This function checks for valid syntax and produces the resulting Lisp float number too.
Showing with 106 additions and 112 deletions