annotate src/strcat.c @ 5562:855b667dea13

Drop cl-macro-environment in favour of byte-compile-macro-environment. lisp/ChangeLog addition: 2011-09-04 Aidan Kehoe <kehoea@parhasard.net> * bytecomp-runtime.el: * bytecomp-runtime.el (byte-compile-macro-environment): Moved from bytecomp.el. * bytecomp.el: * bytecomp.el (byte-compile-initial-macro-environment): Add implementations for #'load-time-value, #'labels here, now cl-macs respects byte-compile-macro-environment. * bytecomp.el (byte-compile-function-environment): * bytecomp.el (byte-compile-macro-environment): Removed. * bytecomp.el (symbol-value): * bytecomp.el (byte-compile-symbol-value): Removed. * cl-extra.el (cl-macroexpand-all): * cl-macs.el: * cl-macs.el (bind-block): * cl-macs.el (cl-macro-environment): Removed. * cl-macs.el (cl-transform-lambda): * cl-macs.el (load-time-value): * cl-macs.el (block): * cl-macs.el (flet): * cl-macs.el (labels): * cl-macs.el (macrolet): * cl-macs.el (symbol-macrolet): * cl-macs.el (lexical-let): * cl-macs.el (apply): * cl-macs.el (nthcdr): * cl-macs.el (getf): * cl-macs.el (substring): * cl-macs.el (values): * cl-macs.el (get-setf-method): * cl-macs.el (cl-setf-do-modify): * cl.el: * cl.el (cl-macro-environment): Removed. * cl.el (cl-macroexpand): * obsolete.el (cl-macro-environment): Moved here. Drop cl-macro-environment, in favour of byte-compile-macro-environment; make the latter available in bytecomp-runtime.el. This makes byte-compile-macro-environment far less useless, since previously code that used cl-macs would ignore it when calling #'cl-macroexpand-all. Add byte-compiler-specific implementations for #'load-time-value, #'labels. The latter is very nice indeed; it avoids the run-time consing of the current implementation, is fully lexical and avoids the run-time shadowing of symbol function slots that flet uses. It would now be reasonable to move most core uses of flet to use labels instead. Non-core code can't rely on print-circle for mutually recursive functions, though, so it's less of an evident win.
author Aidan Kehoe <kehoea@parhasard.net>
date Sun, 04 Sep 2011 20:37:55 +0100
parents 2aa9cd456ae7
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1 /* Copyright (C) 1991 Free Software Foundation, Inc.
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2 This file is part of the GNU C Library.
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3
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4 The GNU C Library is free software: you can redistribute it and/or modify it
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5 under the terms of the GNU General Public License as published by the
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6 Free Software Foundation, either version 3 of the License, or (at your
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7 option) any later version.
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8
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9 The GNU C Library is distributed in the hope that it will be useful, but WITHOUT
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10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 for more details.
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14 You should have received a copy of the GNU General Public License
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15 along with the GNU C Library. If not, see <http://www.gnu.org/licenses/>. */
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17 /* Synched up with: Not in FSF. */
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18
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19 # include <config.h>
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20 # ifndef REGISTER /* Strictly enforced in 20.3 */
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21 # define REGISTER
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22 # endif
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24 /* In HPUX 10 the strcat function references memory past the last byte of
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25 the string! This will core dump if the memory following the last byte is
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26 not mapped.
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28 Here is a correct version from, glibc 1.09.
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29 */
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30
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31 char *strcat (char *dest, const char *src);
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32
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33 /* Append SRC on the end of DEST. */
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34 char *
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35 strcat (char *dest, const char *src)
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36 {
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37 REGISTER char *s1 = dest;
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38 REGISTER const char *s2 = src;
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39 char c;
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41 /* Find the end of the string. */
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42 do
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43 c = *s1++;
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44 while (c != '\0');
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45
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46 /* Make S1 point before the next character, so we can increment
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47 it while memory is read (wins on pipelined cpus). */
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48 s1 -= 2;
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49
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50 do
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51 {
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52 c = *s2++;
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53 *++s1 = c;
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54 }
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55 while (c != '\0');
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56
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57 return dest;
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58 }