20d6e5fe6e
of user keys (documentation pending). The only key whose semantics have changed is the capital 'N' key, which now performs a repeat-search in the opposite direction (just like in vi). This commit is a little bulkier than what I had originally planned. I'm not completely happy with the direction it went, but it's definately an improvement, and the alternative is to continue becoming irrelevant compared to GNU less. (Does anyone even _use_ /usr/bin/more these days?)
137 lines
5.2 KiB
C
137 lines
5.2 KiB
C
/*
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* Copyright (c) 1988 Mark Nudleman
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)less.h 8.1 (Berkeley) 6/6/93
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*
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* $FreeBSD$
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*/
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#define MAXVARLENGTH (20)
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#define NULL_POSITION ((off_t)(-1))
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#define EOI (0)
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#define READ_INTR (-2)
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#define NO_HORIZ_OFF (-1) /* Wrap lines like normal */
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/* Special chars used to tell put_line() to do something special */
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#define UL_CHAR '\201' /* Enter underline mode */
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#define UE_CHAR '\202' /* Exit underline mode */
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#define BO_CHAR '\203' /* Enter boldface mode */
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#define BE_CHAR '\204' /* Exit boldface mode */
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#define CONTROL_CHAR(c) (!isprint(c))
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#define CARAT_CHAR(c) ((c == '\177') ? '?' : (c | 0100))
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#define TOP (0)
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#define TOP_PLUS_ONE (1)
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#define BOTTOM (-1)
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#define BOTTOM_PLUS_ONE (-2)
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#define MIDDLE (-3)
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/* The return type of runmacro() */
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enum runmacro { OK=0, TOOMACRO, BADMACRO, NOMACRO, BADCOMMAND };
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#ifdef DEFINEGLOBALS
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#define GLOBAL(var, val) var = val
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#else
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#define GLOBAL(var, val) extern var
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#endif
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/*
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* This style of error-reporting (see also command.c) is only used by some
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* code. Eventually most of the code should use it, since it is becoming
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* inconvenient to have John Q. random function() calling error().
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*
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* This style of error-reporting still leaves somewhat to be desired....
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*
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* Note that more(1) needs to potentially work under low-memory conditions
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* (such as may occur when all available memory has been sucked-up by
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* the file buffer in ch.c).
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*/
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/* Be careful about ordering correctly!! (must match deferrinit_) */
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enum error { E_OK=0, E_AMBIG, E_BADMATH, E_BADVAR, E_BOGCOM, E_CANTPARSE,
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E_CANTXPND, E_COMPLIM, E_EXTERN, E_NOMAC, E_MALLOC, E_NONUM,
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E_NOSTR, E_NOTOG, E_NULL };
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/* Listed here for reference only. Be careful about ordering correctly!! */
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#define deferrinit_ { \
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"", /* E_OK */ \
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"ambigious macro", /* E_AMBIG */ \
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"invalid arithmetic expression", /* E_BADMATH */ \
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"bad variable", /* E_BADVAR */ \
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"bogus command", /* E_BOGCOM */ \
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"could not parse command string", /* E_CANTPARSE */ \
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"could not expand macro", /* E_CANTXPND */ \
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"compile time limit", /* E_COMPLIM */ \
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"external dependency error", /* E_EXTERN */ \
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"could not find match for macro", /* E_NOMAC */ \
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"malloc() failed", /* E_MALLOC */ \
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"missing numeric argument to command", /* E_NONUM */ \
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"missing string argument to command", /* E_NOSTR */ \
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"bad n-toggle argument to command", /* E_NOTOG */ \
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"to the unknown error", /* E_NULL */ \
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}
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GLOBAL(const char *deferr[], deferrinit_ );
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/*
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* It is possible for erreur to become dis-synchronized from errstr if
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* its users aren't careful. Access through the macros is considered
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* careful.
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*/
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GLOBAL(enum error erreur, NULL);
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GLOBAL(char *errstr, NULL); /* must point be null or free()'ble */
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#define SETERR(e) do { \
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erreur = (e); \
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if (errstr) free(errstr); \
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errstr = NULL; \
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} while (0)
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/* SETERRSTR() also exists. It is in command.c */
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/*
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* An emalloc() traditionally never fails, but fmalloc() may fail, hence
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* the non-standard name. The fmalloc() is just syntactic sugar that sets
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* erreur for the user.
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*
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* fmalloc(size, pointer-to-new-memory);
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*
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* Don't compile this puppy with -Wall...
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*/
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#define FMALLOC(s,v) ((((v) = malloc(s)) ? 0 : \
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((errstr ? free(errstr), errstr=NULL : 0), erreur = E_MALLOC)), (v))
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