Mercurial > hg > xemacs-beta
comparison src/print.c @ 4329:d9eb5ea14f65
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 | d674024a8674 |
| children | cacc942c0d0f |
comparison
equal
deleted
inserted
replaced
| 4328:dfd878799ef0 | 4329:d9eb5ea14f65 |
|---|---|
| 1267 #undef DIGITS_16 | 1267 #undef DIGITS_16 |
| 1268 #undef DIGITS_17 | 1268 #undef DIGITS_17 |
| 1269 #undef DIGITS_18 | 1269 #undef DIGITS_18 |
| 1270 #undef DIGITS_19 | 1270 #undef DIGITS_19 |
| 1271 | 1271 |
| 1272 void | |
| 1273 ulong_to_bit_string (char *p, unsigned long number) | |
| 1274 { | |
| 1275 int i, seen_high_order = 0;; | |
| 1276 | |
| 1277 for (i = ((SIZEOF_LONG * 8) - 1); i >= 0; --i) | |
| 1278 { | |
| 1279 if (number & (unsigned long)1 << i) | |
| 1280 { | |
| 1281 seen_high_order = 1; | |
| 1282 *p++ = '1'; | |
| 1283 } | |
| 1284 else | |
| 1285 { | |
| 1286 if (seen_high_order) | |
| 1287 { | |
| 1288 *p++ = '0'; | |
| 1289 } | |
| 1290 } | |
| 1291 } | |
| 1292 *p = '\0'; | |
| 1293 } | |
| 1294 | |
| 1272 static void | 1295 static void |
| 1273 print_vector_internal (const char *start, const char *end, | 1296 print_vector_internal (const char *start, const char *end, |
| 1274 Lisp_Object obj, | 1297 Lisp_Object obj, |
| 1275 Lisp_Object printcharfun, int escapeflag) | 1298 Lisp_Object printcharfun, int escapeflag) |
| 1276 { | 1299 { |