708 lines
12 KiB
C
708 lines
12 KiB
C
/*
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* Copyright (C) 1984-2011 Mark Nudelman
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Less License, as specified in the README file.
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*
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* For more information about less, or for information on how to
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* contact the author, see the README file.
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*/
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/*
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* Handling functions for command line options.
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*
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* Most options are handled by the generic code in option.c.
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* But all string options, and a few non-string options, require
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* special handling specific to the particular option.
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* This special processing is done by the "handling functions" in this file.
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*
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* Each handling function is passed a "type" and, if it is a string
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* option, the string which should be "assigned" to the option.
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* The type may be one of:
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* INIT The option is being initialized from the command line.
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* TOGGLE The option is being changed from within the program.
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* QUERY The setting of the option is merely being queried.
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*/
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#include "less.h"
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#include "option.h"
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extern int nbufs;
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extern int bufspace;
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extern int pr_type;
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extern int plusoption;
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extern int swindow;
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extern int sc_width;
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extern int sc_height;
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extern int secure;
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extern int dohelp;
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extern int any_display;
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extern char openquote;
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extern char closequote;
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extern char *prproto[];
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extern char *eqproto;
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extern char *hproto;
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extern char *wproto;
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extern IFILE curr_ifile;
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extern char version[];
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extern int jump_sline;
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extern int jump_sline_fraction;
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extern int shift_count;
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extern int shift_count_fraction;
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extern int less_is_more;
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#if LOGFILE
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extern char *namelogfile;
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extern int force_logfile;
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extern int logfile;
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#endif
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#if TAGS
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public char *tagoption = NULL;
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extern char *tags;
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#endif
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#if MSDOS_COMPILER
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extern int nm_fg_color, nm_bg_color;
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extern int bo_fg_color, bo_bg_color;
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extern int ul_fg_color, ul_bg_color;
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extern int so_fg_color, so_bg_color;
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extern int bl_fg_color, bl_bg_color;
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#endif
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#if LOGFILE
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/*
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* Handler for -o option.
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*/
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public void
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opt_o(type, s)
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int type;
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char *s;
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{
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PARG parg;
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if (secure)
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{
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error("log file support is not available", NULL_PARG);
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return;
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}
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switch (type)
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{
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case INIT:
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namelogfile = s;
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break;
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case TOGGLE:
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if (ch_getflags() & CH_CANSEEK)
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{
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error("Input is not a pipe", NULL_PARG);
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return;
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}
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if (logfile >= 0)
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{
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error("Log file is already in use", NULL_PARG);
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return;
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}
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s = skipsp(s);
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namelogfile = lglob(s);
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use_logfile(namelogfile);
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sync_logfile();
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break;
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case QUERY:
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if (logfile < 0)
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error("No log file", NULL_PARG);
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else
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{
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parg.p_string = namelogfile;
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error("Log file \"%s\"", &parg);
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}
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break;
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}
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}
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/*
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* Handler for -O option.
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*/
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public void
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opt__O(type, s)
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int type;
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char *s;
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{
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force_logfile = TRUE;
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opt_o(type, s);
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}
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#endif
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/*
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* Handlers for -j option.
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*/
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public void
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opt_j(type, s)
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int type;
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char *s;
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{
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PARG parg;
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char buf[16];
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int len;
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int err;
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switch (type)
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{
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case INIT:
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case TOGGLE:
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if (*s == '.')
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{
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s++;
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jump_sline_fraction = getfraction(&s, "j", &err);
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if (err)
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error("Invalid line fraction", NULL_PARG);
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else
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calc_jump_sline();
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} else
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{
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int sline = getnum(&s, "j", &err);
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if (err)
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error("Invalid line number", NULL_PARG);
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else
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{
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jump_sline = sline;
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jump_sline_fraction = -1;
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}
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}
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break;
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case QUERY:
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if (jump_sline_fraction < 0)
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{
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parg.p_int = jump_sline;
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error("Position target at screen line %d", &parg);
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} else
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{
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sprintf(buf, ".%06d", jump_sline_fraction);
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len = strlen(buf);
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while (len > 2 && buf[len-1] == '0')
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len--;
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buf[len] = '\0';
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parg.p_string = buf;
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error("Position target at screen position %s", &parg);
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}
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break;
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}
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}
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public void
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calc_jump_sline()
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{
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if (jump_sline_fraction < 0)
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return;
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jump_sline = sc_height * jump_sline_fraction / NUM_FRAC_DENOM;
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}
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/*
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* Handlers for -# option.
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*/
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public void
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opt_shift(type, s)
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int type;
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char *s;
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{
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PARG parg;
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char buf[16];
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int len;
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int err;
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switch (type)
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{
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case INIT:
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case TOGGLE:
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if (*s == '.')
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{
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s++;
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shift_count_fraction = getfraction(&s, "#", &err);
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if (err)
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error("Invalid column fraction", NULL_PARG);
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else
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calc_shift_count();
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} else
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{
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int hs = getnum(&s, "#", &err);
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if (err)
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error("Invalid column number", NULL_PARG);
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else
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{
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shift_count = hs;
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shift_count_fraction = -1;
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}
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}
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break;
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case QUERY:
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if (shift_count_fraction < 0)
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{
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parg.p_int = shift_count;
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error("Horizontal shift %d columns", &parg);
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} else
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{
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sprintf(buf, ".%06d", shift_count_fraction);
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len = strlen(buf);
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while (len > 2 && buf[len-1] == '0')
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len--;
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buf[len] = '\0';
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parg.p_string = buf;
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error("Horizontal shift %s of screen width", &parg);
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}
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break;
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}
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}
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public void
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calc_shift_count()
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{
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if (shift_count_fraction < 0)
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return;
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shift_count = sc_width * shift_count_fraction / NUM_FRAC_DENOM;
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}
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#if USERFILE
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public void
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opt_k(type, s)
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int type;
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char *s;
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{
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PARG parg;
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switch (type)
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{
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case INIT:
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if (lesskey(s, 0))
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{
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parg.p_string = s;
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error("Cannot use lesskey file \"%s\"", &parg);
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}
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break;
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}
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}
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#endif
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#if TAGS
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/*
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* Handler for -t option.
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*/
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public void
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opt_t(type, s)
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int type;
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char *s;
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{
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IFILE save_ifile;
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POSITION pos;
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switch (type)
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{
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case INIT:
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tagoption = s;
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/* Do the rest in main() */
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break;
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case TOGGLE:
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if (secure)
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{
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error("tags support is not available", NULL_PARG);
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break;
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}
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findtag(skipsp(s));
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save_ifile = save_curr_ifile();
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/*
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* Try to open the file containing the tag
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* and search for the tag in that file.
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*/
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if (edit_tagfile() || (pos = tagsearch()) == NULL_POSITION)
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{
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/* Failed: reopen the old file. */
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reedit_ifile(save_ifile);
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break;
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}
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unsave_ifile(save_ifile);
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jump_loc(pos, jump_sline);
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break;
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}
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}
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/*
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* Handler for -T option.
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*/
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public void
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opt__T(type, s)
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int type;
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char *s;
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{
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PARG parg;
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switch (type)
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{
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case INIT:
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tags = s;
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break;
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case TOGGLE:
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s = skipsp(s);
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tags = lglob(s);
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break;
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case QUERY:
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parg.p_string = tags;
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error("Tags file \"%s\"", &parg);
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break;
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}
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}
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#endif
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/*
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* Handler for -p option.
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*/
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public void
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opt_p(type, s)
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int type;
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register char *s;
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{
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switch (type)
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{
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case INIT:
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/*
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* Unget a search command for the specified string.
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* {{ This won't work if the "/" command is
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* changed or invalidated by a .lesskey file. }}
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*/
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plusoption = TRUE;
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ungetsc(s);
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/*
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* In "more" mode, the -p argument is a command,
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* not a search string, so we don't need a slash.
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*/
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if (!less_is_more)
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ungetsc("/");
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break;
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}
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}
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/*
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* Handler for -P option.
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*/
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public void
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opt__P(type, s)
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int type;
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register char *s;
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{
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register char **proto;
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PARG parg;
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switch (type)
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{
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case INIT:
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case TOGGLE:
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/*
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* Figure out which prototype string should be changed.
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*/
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switch (*s)
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{
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case 's': proto = &prproto[PR_SHORT]; s++; break;
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case 'm': proto = &prproto[PR_MEDIUM]; s++; break;
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case 'M': proto = &prproto[PR_LONG]; s++; break;
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case '=': proto = &eqproto; s++; break;
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case 'h': proto = &hproto; s++; break;
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case 'w': proto = &wproto; s++; break;
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default: proto = &prproto[PR_SHORT]; break;
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}
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free(*proto);
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*proto = save(s);
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break;
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case QUERY:
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parg.p_string = prproto[pr_type];
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error("%s", &parg);
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break;
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}
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}
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/*
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* Handler for the -b option.
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*/
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/*ARGSUSED*/
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public void
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opt_b(type, s)
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int type;
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char *s;
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{
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switch (type)
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{
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case INIT:
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case TOGGLE:
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/*
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* Set the new number of buffers.
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*/
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ch_setbufspace(bufspace);
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break;
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case QUERY:
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break;
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}
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}
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/*
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* Handler for the -i option.
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*/
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/*ARGSUSED*/
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public void
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opt_i(type, s)
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int type;
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char *s;
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{
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switch (type)
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{
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case TOGGLE:
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chg_caseless();
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break;
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case QUERY:
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case INIT:
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break;
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}
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}
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/*
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* Handler for the -V option.
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*/
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/*ARGSUSED*/
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public void
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opt__V(type, s)
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int type;
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char *s;
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{
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switch (type)
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{
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case TOGGLE:
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case QUERY:
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dispversion();
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break;
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case INIT:
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/*
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* Force output to stdout per GNU standard for --version output.
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*/
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any_display = 1;
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putstr("less ");
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putstr(version);
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putstr("\nCopyright (C) 1984-2009 Mark Nudelman\n\n");
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putstr("less comes with NO WARRANTY, to the extent permitted by law.\n");
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putstr("For information about the terms of redistribution,\n");
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putstr("see the file named README in the less distribution.\n");
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putstr("Homepage: http://www.greenwoodsoftware.com/less\n");
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quit(QUIT_OK);
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break;
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}
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}
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#if MSDOS_COMPILER
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/*
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* Parse an MSDOS color descriptor.
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*/
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static void
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colordesc(s, fg_color, bg_color)
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char *s;
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int *fg_color;
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int *bg_color;
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{
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int fg, bg;
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int err;
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fg = getnum(&s, "D", &err);
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if (err)
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{
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error("Missing fg color in -D", NULL_PARG);
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return;
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}
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if (*s != '.')
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bg = nm_bg_color;
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else
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{
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s++;
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bg = getnum(&s, "D", &err);
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if (err)
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{
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error("Missing bg color in -D", NULL_PARG);
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return;
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}
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}
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if (*s != '\0')
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error("Extra characters at end of -D option", NULL_PARG);
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*fg_color = fg;
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*bg_color = bg;
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}
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/*
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* Handler for the -D option.
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*/
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/*ARGSUSED*/
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public void
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opt_D(type, s)
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int type;
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char *s;
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{
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switch (type)
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{
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case INIT:
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case TOGGLE:
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switch (*s++)
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{
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case 'n':
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colordesc(s, &nm_fg_color, &nm_bg_color);
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break;
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case 'd':
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colordesc(s, &bo_fg_color, &bo_bg_color);
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break;
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case 'u':
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colordesc(s, &ul_fg_color, &ul_bg_color);
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break;
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case 'k':
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colordesc(s, &bl_fg_color, &bl_bg_color);
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break;
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case 's':
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colordesc(s, &so_fg_color, &so_bg_color);
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break;
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default:
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error("-D must be followed by n, d, u, k or s", NULL_PARG);
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break;
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}
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if (type == TOGGLE)
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{
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at_enter(AT_STANDOUT);
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at_exit();
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}
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break;
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case QUERY:
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break;
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}
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}
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#endif
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/*
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* Handler for the -x option.
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*/
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public void
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opt_x(type, s)
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int type;
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register char *s;
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{
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extern int tabstops[];
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extern int ntabstops;
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extern int tabdefault;
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char msg[60+(4*TABSTOP_MAX)];
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int i;
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PARG p;
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switch (type)
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{
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case INIT:
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case TOGGLE:
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/* Start at 1 because tabstops[0] is always zero. */
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for (i = 1; i < TABSTOP_MAX; )
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{
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int n = 0;
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s = skipsp(s);
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while (*s >= '0' && *s <= '9')
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n = (10 * n) + (*s++ - '0');
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if (n > tabstops[i-1])
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tabstops[i++] = n;
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s = skipsp(s);
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if (*s++ != ',')
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break;
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}
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if (i < 2)
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return;
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ntabstops = i;
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tabdefault = tabstops[ntabstops-1] - tabstops[ntabstops-2];
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break;
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case QUERY:
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strcpy(msg, "Tab stops ");
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if (ntabstops > 2)
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{
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for (i = 1; i < ntabstops; i++)
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{
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if (i > 1)
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strcat(msg, ",");
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sprintf(msg+strlen(msg), "%d", tabstops[i]);
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}
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|
sprintf(msg+strlen(msg), " and then ");
|
|
}
|
|
sprintf(msg+strlen(msg), "every %d spaces",
|
|
tabdefault);
|
|
p.p_string = msg;
|
|
error("%s", &p);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Handler for the -" option.
|
|
*/
|
|
public void
|
|
opt_quote(type, s)
|
|
int type;
|
|
register char *s;
|
|
{
|
|
char buf[3];
|
|
PARG parg;
|
|
|
|
switch (type)
|
|
{
|
|
case INIT:
|
|
case TOGGLE:
|
|
if (s[0] == '\0')
|
|
{
|
|
openquote = closequote = '\0';
|
|
break;
|
|
}
|
|
if (s[1] != '\0' && s[2] != '\0')
|
|
{
|
|
error("-\" must be followed by 1 or 2 chars", NULL_PARG);
|
|
return;
|
|
}
|
|
openquote = s[0];
|
|
if (s[1] == '\0')
|
|
closequote = openquote;
|
|
else
|
|
closequote = s[1];
|
|
break;
|
|
case QUERY:
|
|
buf[0] = openquote;
|
|
buf[1] = closequote;
|
|
buf[2] = '\0';
|
|
parg.p_string = buf;
|
|
error("quotes %s", &parg);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* "-?" means display a help message.
|
|
* If from the command line, exit immediately.
|
|
*/
|
|
/*ARGSUSED*/
|
|
public void
|
|
opt_query(type, s)
|
|
int type;
|
|
char *s;
|
|
{
|
|
switch (type)
|
|
{
|
|
case QUERY:
|
|
case TOGGLE:
|
|
error("Use \"h\" for help", NULL_PARG);
|
|
break;
|
|
case INIT:
|
|
dohelp = 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Get the "screen window" size.
|
|
*/
|
|
public int
|
|
get_swindow()
|
|
{
|
|
if (swindow > 0)
|
|
return (swindow);
|
|
return (sc_height + swindow);
|
|
}
|
|
|