IABSD.fr/src/usr.bin/less/less.h

Branch : - branch - master - tag -

• Show log

  Commit

• Author : deraadt
  Date : 2019-09-03 23:08:42
  Hash : d65139b4
  Message : less uses a correct raceless signal method of indicating signal events in a volatile sig_atomic_t variable, and then processing events in the mainloop. But only one variable was used for 3 signals, with |= bit operations which are signal interruptable! Rewrite the code to use 3 independent variables and cleanup how the mainloop observes indications. ok schwarze

• usr.bin/less/less.h

• /*
   * Copyright (C) 1984-2012  Mark Nudelman
   * Modified for use with illumos by Garrett D'Amore.
   * Copyright 2014 Garrett D'Amore <garrett@damore.org>
   *
   * You may distribute under the terms of either the GNU General Public
   * License or the Less License, as specified in the README file.
   *
   * For more information, see the README file.
   */
  
  /*
   * Standard include file for "less".
   */
  
  #include "defines.h"
  
  #include <sys/types.h>
  
  #include <ctype.h>
  #include <fcntl.h>
  #include <limits.h>
  #include <signal.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  #include <wctype.h>
  
  /*
   * Simple lowercase test which can be used during option processing
   * (before options are parsed which might tell us what charset to use).
   */
  
  #undef IS_SPACE
  #undef IS_DIGIT
  
  #define	IS_SPACE(c)	isspace((unsigned char)(c))
  #define	IS_DIGIT(c)	isdigit((unsigned char)(c))
  
  #ifndef TRUE
  #define	TRUE		1
  #endif
  #ifndef FALSE
  #define	FALSE		0
  #endif
  
  #define	OPT_OFF		0
  #define	OPT_ON		1
  #define	OPT_ONPLUS	2
  
  /*
   * Special types and constants.
   */
  typedef unsigned long LWCHAR;
  #define	MIN_LINENUM_WIDTH  7	/* Min printing width of a line number */
  #define	MAX_UTF_CHAR_LEN   6	/* Max bytes in one UTF-8 char */
  
  #define	SHELL_META_QUEST 1
  
  /*
   * An IFILE represents an input file.
   */
  #define	IFILE		void *
  
  /*
   * The structure used to represent a "screen position".
   * This consists of a file position, and a screen line number.
   * The meaning is that the line starting at the given file
   * position is displayed on the ln-th line of the screen.
   * (Screen lines before ln are empty.)
   */
  struct scrpos {
  	off_t pos;
  	int ln;
  };
  
  typedef union parg {
  	char *p_string;
  	int p_int;
  	off_t p_linenum;
  } PARG;
  
  struct textlist {
  	char *string;
  	char *endstring;
  };
  
  #define	EOI		(-1)
  
  #define	READ_INTR	(-2)
  
  /* A fraction is represented by an int n; the fraction is n/NUM_FRAC_DENOM */
  #define	NUM_FRAC_DENOM			1000000
  #define	NUM_LOG_FRAC_DENOM		6
  
  /* How quiet should we be? */
  #define	NOT_QUIET	0	/* Ring bell at eof and for errors */
  #define	LITTLE_QUIET	1	/* Ring bell only for errors */
  #define	VERY_QUIET	2	/* Never ring bell */
  
  /* How should we prompt? */
  #define	PR_SHORT	0	/* Prompt with colon */
  #define	PR_MEDIUM	1	/* Prompt with message */
  #define	PR_LONG		2	/* Prompt with longer message */
  
  /* How should we handle backspaces? */
  #define	BS_SPECIAL	0	/* Do special things for underlining and bold */
  #define	BS_NORMAL	1	/* \b treated as normal char; actually output */
  #define	BS_CONTROL	2	/* \b treated as control char; prints as ^H */
  
  /* How should we search? */
  #define	SRCH_FORW	(1 << 0)  /* Search forward from current position */
  #define	SRCH_BACK	(1 << 1)  /* Search backward from current position */
  #define	SRCH_NO_MOVE	(1 << 2)  /* Highlight, but don't move */
  #define	SRCH_FIND_ALL	(1 << 4)  /* Find and highlight all matches */
  #define	SRCH_NO_MATCH	(1 << 8)  /* Search for non-matching lines */
  #define	SRCH_PAST_EOF	(1 << 9)  /* Search past end-of-file, into next file */
  #define	SRCH_FIRST_FILE	(1 << 10) /* Search starting at the first file */
  #define	SRCH_NO_REGEX	(1 << 12) /* Don't use regular expressions */
  #define	SRCH_FILTER	(1 << 13) /* Search is for '&' (filter) command */
  #define	SRCH_AFTER_TARGET (1 << 14) /* Start search after the target line */
  
  #define	SRCH_REVERSE(t)	(((t) & SRCH_FORW) ? \
  				(((t) & ~SRCH_FORW) | SRCH_BACK) : \
  				(((t) & ~SRCH_BACK) | SRCH_FORW))
  
  /* */
  #define	NO_MCA		0
  #define	MCA_DONE	1
  #define	MCA_MORE	2
  
  #define	CC_OK		0	/* Char was accepted & processed */
  #define	CC_QUIT		1	/* Char was a request to abort current cmd */
  #define	CC_ERROR	2	/* Char could not be accepted due to error */
  #define	CC_PASS		3	/* Char was rejected (internal) */
  
  #define	CF_QUIT_ON_ERASE 0001   /* Abort cmd if its entirely erased */
  
  /* Special char bit-flags used to tell put_line() to do something special */
  #define	AT_NORMAL	(0)
  #define	AT_UNDERLINE	(1 << 0)
  #define	AT_BOLD		(1 << 1)
  #define	AT_BLINK	(1 << 2)
  #define	AT_STANDOUT	(1 << 3)
  #define	AT_ANSI		(1 << 4)  /* Content-supplied "ANSI" escape sequence */
  #define	AT_BINARY	(1 << 5)  /* LESS*BINFMT representation */
  #define	AT_HILITE	(1 << 6)  /* Internal highlights (e.g., for search) */
  #define	AT_INDET	(1 << 7)  /* Indeterminate: either bold or underline */
  
  #define	CONTROL(c)	((c)&037)
  #define	ESC		CONTROL('[')
  
  extern int any_sigs(void);
  extern int abort_sigs(void);
  
  #define	QUIT_OK		0
  #define	QUIT_ERROR	1
  #define	QUIT_INTERRUPT	2
  #define	QUIT_SAVED_STATUS (-1)
  
  #define	FOLLOW_DESC	0
  #define	FOLLOW_NAME	1
  
  /* filestate flags */
  #define	CH_CANSEEK	001
  #define	CH_KEEPOPEN	002
  #define	CH_POPENED	004
  #define	CH_HELPFILE	010
  #define	CH_NODATA	020	/* Special case for zero length files */
  
  
  #define	ch_zero()	(0)
  
  #define	FAKE_EMPTYFILE	"@/\\less/\\empty/\\file/\\@"
  
  /* Flags for cvt_text */
  #define	CVT_TO_LC	01	/* Convert upper-case to lower-case */
  #define	CVT_BS		02	/* Do backspace processing */
  #define	CVT_CRLF	04	/* Remove CR after LF */
  #define	CVT_ANSI	010	/* Remove ANSI escape sequences */
  
  #include "funcs.h"
  
  /* Functions not included in funcs.h */
  void postoa(off_t, char *, size_t);
  void inttoa(int, char *, size_t);