Mercurial > hg > xemacs-beta

comparison lisp/subr.el @ 4329:d9eb5ea14f65

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Provide %b in #'format; use it for converting between ints and bit vectors. lisp/ChangeLog addition: 2007-12-17 Aidan Kehoe <kehoea@parhasard.net> * subr.el (integer-to-bit-vector): New. * subr.el (bit-vector-to-integer): New. Provide naive implementations using the Lisp reader for these. src/ChangeLog addition: 2007-12-17 Aidan Kehoe <kehoea@parhasard.net> * doprnt.c (emacs_doprnt_1): Add support for formatted printing of both longs and bignums as base 2. * editfns.c (Fformat): Document the new %b escape for #'format. * lisp.h: Make ulong_to_bit_string available beside long_to_string. * lread.c: Fix a bug where the integer base was being ignored in certain contexts; thank you Sebastian Freundt. This is necessary for correct behaviour of #'integer-to-bit-vector and #'bit-vector-to-integer, just added to subr.el * print.c (ulong_to_bit_string): New. Analagous to long_to_string, but used all the time when %b is encountered, since we can't pass that to sprintf. man/ChangeLog addition: 2007-12-17 Aidan Kehoe <kehoea@parhasard.net> * lispref/strings.texi (Formatting Strings): Document %b for binary output.
author Aidan Kehoe <kehoea@parhasard.net>
date Mon, 17 Dec 2007 08:44:14 +0100
parents 66e2714696bd
children ef9eb714f0e4
comparison
equal deleted inserted replaced
4328:dfd878799ef0 4329:d9eb5ea14f65
910 910
911 ;; These two names are a bit awkward, as they conflict with the normal 911 ;; These two names are a bit awkward, as they conflict with the normal
912 ;; foo-to-bar naming scheme, but CLtL2 has them, so they stay. 912 ;; foo-to-bar naming scheme, but CLtL2 has them, so they stay.
913 (define-function 'char-int 'char-to-int) 913 (define-function 'char-int 'char-to-int)
914 (define-function 'int-char 'int-to-char) 914 (define-function 'int-char 'int-to-char)
915
916 ;; XEmacs addition.
917 (defun integer-to-bit-vector (integer &optional minlength)
918 "Return INTEGER converted to a bit vector.
919 Optional argument MINLENGTH gives a minimum length for the returned vector.
920 If MINLENGTH is not given, zero high-order bits will be ignored."
921 (check-argument-type #'integerp integer)
922 (setq minlength (or minlength 0))
923 (check-nonnegative-number minlength)
924 (read (format (format "#*%%0%db" minlength) integer)))
925
926 ;; XEmacs addition.
927 (defun bit-vector-to-integer (bit-vector)
928 "Return BIT-VECTOR converted to an integer.
929 If bignum support is available, BIT-VECTOR's length is unlimited.
930 Otherwise the limit is the number of value bits in an Lisp integer. "
931 (check-argument-type #'bit-vector-p bit-vector)
932 (setq bit-vector (prin1-to-string bit-vector))
933 (aset bit-vector 1 ?b)
934 (read bit-vector))
915 935
916 (defun string-width (string) 936 (defun string-width (string)
917 "Return number of columns STRING occupies when displayed. 937 "Return number of columns STRING occupies when displayed.
918 With international (Mule) support, uses the charset-columns attribute of 938 With international (Mule) support, uses the charset-columns attribute of
919 the characters in STRING, which may not accurately represent the actual 939 the characters in STRING, which may not accurately represent the actual