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optfunc.c
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optfunc.c
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/*
* Copyright (C) 1984-2023 Mark Nudelman
*
* 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.
*/
/*
* Handling functions for command line options.
*
* Most options are handled by the generic code in option.c.
* But all string options, and a few non-string options, require
* special handling specific to the particular option.
* This special processing is done by the "handling functions" in this file.
*
* Each handling function is passed a "type" and, if it is a string
* option, the string which should be "assigned" to the option.
* The type may be one of:
* INIT The option is being initialized from the command line.
* TOGGLE The option is being changed from within the program.
* QUERY The setting of the option is merely being queried.
*/
#include "less.h"
#include "option.h"
extern int bufspace;
extern int pr_type;
extern int plusoption;
extern int swindow;
extern int sc_width;
extern int sc_height;
extern int dohelp;
extern char openquote;
extern char closequote;
extern char *prproto[];
extern char *eqproto;
extern char *hproto;
extern char *wproto;
extern char *every_first_cmd;
extern IFILE curr_ifile;
extern char version[];
extern int jump_sline;
extern long jump_sline_fraction;
extern int shift_count;
extern long shift_count_fraction;
extern int match_shift;
extern long match_shift_fraction;
extern char rscroll_char;
extern int rscroll_attr;
extern int mousecap;
extern int wheel_lines;
extern int less_is_more;
extern int linenum_width;
extern int status_col_width;
extern int use_color;
extern int want_filesize;
extern int header_lines;
extern int header_cols;
extern int def_search_type;
extern int chopline;
extern int tabstops[];
extern int ntabstops;
extern int tabdefault;
extern char intr_char;
#if LOGFILE
extern char *namelogfile;
extern int force_logfile;
extern int logfile;
#endif
#if TAGS
public char *tagoption = NULL;
extern char *tags;
extern char ztags[];
#endif
#if LESSTEST
extern char *ttyin_name;
extern int is_tty;
#endif /*LESSTEST*/
#if MSDOS_COMPILER
extern int nm_fg_color, nm_bg_color;
extern int bo_fg_color, bo_bg_color;
extern int ul_fg_color, ul_bg_color;
extern int so_fg_color, so_bg_color;
extern int bl_fg_color, bl_bg_color;
extern int sgr_mode;
#if MSDOS_COMPILER==WIN32C
#ifndef COMMON_LVB_UNDERSCORE
#define COMMON_LVB_UNDERSCORE 0x8000
#endif
#endif
#endif
#if LOGFILE
/*
* Handler for -o option.
*/
public void opt_o(int type, char *s)
{
PARG parg;
char *filename;
if (!secure_allow(SF_LOGFILE))
{
error("log file support is not available", NULL_PARG);
return;
}
switch (type)
{
case INIT:
namelogfile = save(s);
break;
case TOGGLE:
if (ch_getflags() & CH_CANSEEK)
{
error("Input is not a pipe", NULL_PARG);
return;
}
if (logfile >= 0)
{
error("Log file is already in use", NULL_PARG);
return;
}
s = skipsp(s);
if (namelogfile != NULL)
free(namelogfile);
filename = lglob(s);
namelogfile = shell_unquote(filename);
free(filename);
use_logfile(namelogfile);
sync_logfile();
break;
case QUERY:
if (logfile < 0)
error("No log file", NULL_PARG);
else
{
parg.p_string = namelogfile;
error("Log file \"%s\"", &parg);
}
break;
}
}
/*
* Handler for -O option.
*/
public void opt__O(int type, char *s)
{
force_logfile = TRUE;
opt_o(type, s);
}
#endif
static int toggle_fraction(int *num, long *frac, char *s, char *printopt, void (*calc)(void))
{
int err;
if (s == NULL)
{
(*calc)();
} else if (*s == '.')
{
long tfrac;
s++;
tfrac = getfraction(&s, printopt, &err);
if (err)
{
error("Invalid fraction", NULL_PARG);
return -1;
}
*frac = tfrac;
(*calc)();
} else
{
int tnum = getnum(&s, printopt, &err);
if (err)
{
error("Invalid number", NULL_PARG);
return -1;
}
*frac = -1;
*num = tnum;
}
return 0;
}
static void query_fraction(int value, long fraction, char *int_msg, char *frac_msg)
{
PARG parg;
if (fraction < 0)
{
parg.p_int = value;
error(int_msg, &parg);
} else
{
char buf[INT_STRLEN_BOUND(long)+2];
int len;
SNPRINTF1(buf, sizeof(buf), ".%06ld", fraction);
len = (int) strlen(buf);
while (len > 2 && buf[len-1] == '0')
len--;
buf[len] = '\0';
parg.p_string = buf;
error(frac_msg, &parg);
}
}
/*
* Handlers for -j option.
*/
public void opt_j(int type, char *s)
{
switch (type)
{
case INIT:
case TOGGLE:
toggle_fraction(&jump_sline, &jump_sline_fraction,
s, "j", calc_jump_sline);
break;
case QUERY:
query_fraction(jump_sline, jump_sline_fraction,
"Position target at screen line %d", "Position target at screen position %s");
break;
}
}
public void calc_jump_sline(void)
{
if (jump_sline_fraction >= 0)
jump_sline = (int) muldiv(sc_height, jump_sline_fraction, NUM_FRAC_DENOM);
if (jump_sline <= header_lines)
jump_sline = header_lines + 1;
}
/*
* Handlers for -# option.
*/
public void opt_shift(int type, char *s)
{
switch (type)
{
case INIT:
case TOGGLE:
toggle_fraction(&shift_count, &shift_count_fraction,
s, "#", calc_shift_count);
break;
case QUERY:
query_fraction(shift_count, shift_count_fraction,
"Horizontal shift %d columns", "Horizontal shift %s of screen width");
break;
}
}
public void calc_shift_count(void)
{
if (shift_count_fraction < 0)
return;
shift_count = (int) muldiv(sc_width, shift_count_fraction, NUM_FRAC_DENOM);
}
#if USERFILE
public void opt_k(int type, char *s)
{
PARG parg;
switch (type)
{
case INIT:
if (lesskey(s, 0))
{
parg.p_string = s;
error("Cannot use lesskey file \"%s\"", &parg);
}
break;
}
}
#if HAVE_LESSKEYSRC
public void opt_ks(int type, char *s)
{
PARG parg;
switch (type)
{
case INIT:
if (lesskey_src(s, 0))
{
parg.p_string = s;
error("Cannot use lesskey source file \"%s\"", &parg);
}
break;
}
}
#endif /* HAVE_LESSKEYSRC */
#endif /* USERFILE */
/*
* Handler for -S option.
*/
public void opt__S(int type, char *s)
{
switch (type)
{
case TOGGLE:
pos_rehead();
break;
}
}
#if TAGS
/*
* Handler for -t option.
*/
public void opt_t(int type, char *s)
{
IFILE save_ifile;
POSITION pos;
switch (type)
{
case INIT:
tagoption = save(s);
/* Do the rest in main() */
break;
case TOGGLE:
if (!secure_allow(SF_TAGS))
{
error("tags support is not available", NULL_PARG);
break;
}
findtag(skipsp(s));
save_ifile = save_curr_ifile();
/*
* Try to open the file containing the tag
* and search for the tag in that file.
*/
if (edit_tagfile() || (pos = tagsearch()) == NULL_POSITION)
{
/* Failed: reopen the old file. */
reedit_ifile(save_ifile);
break;
}
unsave_ifile(save_ifile);
jump_loc(pos, jump_sline);
break;
}
}
/*
* Handler for -T option.
*/
public void opt__T(int type, char *s)
{
PARG parg;
char *filename;
switch (type)
{
case INIT:
tags = save(s);
break;
case TOGGLE:
s = skipsp(s);
if (tags != NULL && tags != ztags)
free(tags);
filename = lglob(s);
tags = shell_unquote(filename);
free(filename);
break;
case QUERY:
parg.p_string = tags;
error("Tags file \"%s\"", &parg);
break;
}
}
#endif
/*
* Handler for -p option.
*/
public void opt_p(int type, char *s)
{
switch (type)
{
case INIT:
/*
* Unget a command for the specified string.
*/
if (less_is_more)
{
/*
* In "more" mode, the -p argument is a command,
* not a search string, so we don't need a slash.
*/
every_first_cmd = save(s);
} else
{
plusoption = TRUE;
/*
* {{ This won't work if the "/" command is
* changed or invalidated by a .lesskey file. }}
*/
ungetsc("/");
ungetsc(s);
ungetcc_back(CHAR_END_COMMAND);
}
break;
}
}
/*
* Handler for -P option.
*/
public void opt__P(int type, char *s)
{
char **proto;
PARG parg;
switch (type)
{
case INIT:
case TOGGLE:
/*
* Figure out which prototype string should be changed.
*/
switch (*s)
{
case 's': proto = &prproto[PR_SHORT]; s++; break;
case 'm': proto = &prproto[PR_MEDIUM]; s++; break;
case 'M': proto = &prproto[PR_LONG]; s++; break;
case '=': proto = &eqproto; s++; break;
case 'h': proto = &hproto; s++; break;
case 'w': proto = &wproto; s++; break;
default: proto = &prproto[PR_SHORT]; break;
}
free(*proto);
*proto = save(s);
break;
case QUERY:
parg.p_string = prproto[pr_type];
error("%s", &parg);
break;
}
}
/*
* Handler for the -b option.
*/
/*ARGSUSED*/
public void opt_b(int type, char *s)
{
switch (type)
{
case INIT:
case TOGGLE:
/*
* Set the new number of buffers.
*/
ch_setbufspace(bufspace);
break;
case QUERY:
break;
}
}
/*
* Handler for the -i option.
*/
/*ARGSUSED*/
public void opt_i(int type, char *s)
{
switch (type)
{
case TOGGLE:
chg_caseless();
break;
case QUERY:
case INIT:
break;
}
}
/*
* Handler for the -V option.
*/
/*ARGSUSED*/
public void opt__V(int type, char *s)
{
switch (type)
{
case TOGGLE:
case QUERY:
dispversion();
break;
case INIT:
set_output(1); /* Force output to stdout per GNU standard for --version output. */
putstr("less ");
putstr(version);
putstr(" (");
putstr(pattern_lib_name());
putstr(" regular expressions)\n");
{
char constant *copyright =
"Copyright (C) 1984-2023 Mark Nudelman\n\n";
putstr(copyright);
}
if (version[strlen(version)-1] == 'x')
{
putstr("** This is an EXPERIMENTAL build of the 'less' software,\n");
putstr("** and may not function correctly.\n");
putstr("** Obtain release builds from the web page below.\n\n");
}
#if LESSTEST
putstr("This build supports LESSTEST.\n");
#endif /*LESSTEST*/
putstr("less comes with NO WARRANTY, to the extent permitted by law.\n");
putstr("For information about the terms of redistribution,\n");
putstr("see the file named README in the less distribution.\n");
putstr("Home page: https://greenwoodsoftware.com/less\n");
quit(QUIT_OK);
break;
}
}
#if MSDOS_COMPILER
/*
* Parse an MSDOS color descriptor.
*/
static void colordesc(char *s, int *fg_color, int *bg_color)
{
int fg, bg;
#if MSDOS_COMPILER==WIN32C
int ul = 0;
if (*s == 'u')
{
ul = COMMON_LVB_UNDERSCORE;
s++;
if (*s == '\0')
{
*fg_color = nm_fg_color | ul;
*bg_color = nm_bg_color;
return;
}
}
#endif
if (parse_color(s, &fg, &bg) == CT_NULL)
{
PARG p;
p.p_string = s;
error("Invalid color string \"%s\"", &p);
} else
{
if (fg == CV_NOCHANGE)
fg = nm_fg_color;
if (bg == CV_NOCHANGE)
bg = nm_bg_color;
#if MSDOS_COMPILER==WIN32C
fg |= ul;
#endif
*fg_color = fg;
*bg_color = bg;
}
}
#endif
static int color_from_namechar(char namechar)
{
switch (namechar)
{
case 'B': return AT_COLOR_BIN;
case 'C': return AT_COLOR_CTRL;
case 'E': return AT_COLOR_ERROR;
case 'H': return AT_COLOR_HEADER;
case 'M': return AT_COLOR_MARK;
case 'N': return AT_COLOR_LINENUM;
case 'P': return AT_COLOR_PROMPT;
case 'R': return AT_COLOR_RSCROLL;
case 'S': return AT_COLOR_SEARCH;
case 'W': case 'A': return AT_COLOR_ATTN;
case 'n': return AT_NORMAL;
case 's': return AT_STANDOUT;
case 'd': return AT_BOLD;
case 'u': return AT_UNDERLINE;
case 'k': return AT_BLINK;
default:
if (namechar >= '1' && namechar <= '0'+NUM_SEARCH_COLORS)
return AT_COLOR_SUBSEARCH(namechar-'0');
return -1;
}
}
/*
* Handler for the -D option.
*/
/*ARGSUSED*/
public void opt_D(int type, char *s)
{
PARG p;
int attr;
switch (type)
{
case INIT:
case TOGGLE:
#if MSDOS_COMPILER
if (*s == 'a')
{
sgr_mode = !sgr_mode;
break;
}
#endif
attr = color_from_namechar(s[0]);
if (attr < 0)
{
p.p_char = s[0];
error("Invalid color specifier '%c'", &p);
return;
}
if (!use_color && (attr & AT_COLOR))
{
error("Set --use-color before changing colors", NULL_PARG);
return;
}
s++;
#if MSDOS_COMPILER
if (!(attr & AT_COLOR))
{
switch (attr)
{
case AT_NORMAL:
colordesc(s, &nm_fg_color, &nm_bg_color);
break;
case AT_BOLD:
colordesc(s, &bo_fg_color, &bo_bg_color);
break;
case AT_UNDERLINE:
colordesc(s, &ul_fg_color, &ul_bg_color);
break;
case AT_BLINK:
colordesc(s, &bl_fg_color, &bl_bg_color);
break;
case AT_STANDOUT:
colordesc(s, &so_fg_color, &so_bg_color);
break;
}
if (type == TOGGLE)
{
at_enter(AT_STANDOUT);
at_exit();
}
} else
#endif
if (set_color_map(attr, s) < 0)
{
p.p_string = s;
error("Invalid color string \"%s\"", &p);
return;
}
break;
#if MSDOS_COMPILER
case QUERY:
p.p_string = (sgr_mode) ? "on" : "off";
error("SGR mode is %s", &p);
break;
#endif
}
}
/*
*/
public void set_tabs(char *s, int len)
{
int i;
char *es = s + len;
/* Start at 1 because tabstops[0] is always zero. */
for (i = 1; i < TABSTOP_MAX; )
{
int n = 0;
int v = FALSE;
while (s < es && *s == ' ')
s++;
for (; s < es && *s >= '0' && *s <= '9'; s++)
{
v |= ckd_mul(&n, n, 10);
v |= ckd_add(&n, n, *s - '0');
}
if (!v && n > tabstops[i-1])
tabstops[i++] = n;
while (s < es && *s == ' ')
s++;
if (s == es || *s++ != ',')
break;
}
if (i < 2)
return;
ntabstops = i;
tabdefault = tabstops[ntabstops-1] - tabstops[ntabstops-2];
}
/*
* Handler for the -x option.
*/
public void opt_x(int type, char *s)
{
char msg[60+((INT_STRLEN_BOUND(int)+1)*TABSTOP_MAX)];
int i;
PARG p;
switch (type)
{
case INIT:
case TOGGLE:
set_tabs(s, strlen(s));
break;
case QUERY:
strcpy(msg, "Tab stops ");
if (ntabstops > 2)
{
for (i = 1; i < ntabstops; i++)
{
if (i > 1)
strcat(msg, ",");
sprintf(msg+strlen(msg), "%d", tabstops[i]);
}
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(int type, 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;
}
}
/*
* Handler for the --rscroll option.
*/
/*ARGSUSED*/
public void opt_rscroll(int type, char *s)
{
PARG p;
switch (type)
{
case INIT:
case TOGGLE: {
char *fmt;
int attr = AT_STANDOUT;
setfmt(s, &fmt, &attr, "*s>", FALSE);
if (strcmp(fmt, "-") == 0)
{
rscroll_char = 0;
} else
{
rscroll_char = *fmt ? *fmt : '>';
rscroll_attr = attr|AT_COLOR_RSCROLL;
}
break; }
case QUERY: {
p.p_string = rscroll_char ? prchar(rscroll_char) : "-";
error("rscroll character is %s", &p);
break; }
}
}
/*
* "-?" means display a help message.
* If from the command line, exit immediately.
*/
/*ARGSUSED*/
public void opt_query(int type, char *s)
{
switch (type)
{
case QUERY:
case TOGGLE:
error("Use \"h\" for help", NULL_PARG);
break;
case INIT:
dohelp = 1;
}
}
/*ARGSUSED*/
public void opt_match_shift(int type, char *s)
{
switch (type)
{
case INIT:
case TOGGLE:
toggle_fraction(&match_shift, &match_shift_fraction,
s, "--match-shift", calc_match_shift);
break;
case QUERY:
query_fraction(match_shift, match_shift_fraction,
"Search match shift is %d", "Search match shift is %s of screen width");
break;
}
}
public void calc_match_shift(void)
{
if (match_shift_fraction < 0)
return;
match_shift = (int) muldiv(sc_width, match_shift_fraction, NUM_FRAC_DENOM);
}
/*
* Handler for the --mouse option.
*/
/*ARGSUSED*/
public void opt_mousecap(int type, char *s)
{
switch (type)
{
case TOGGLE:
if (mousecap == OPT_OFF)
deinit_mouse();
else
init_mouse();
break;
case INIT:
case QUERY:
break;
}
}
/*
* Handler for the --wheel-lines option.
*/
/*ARGSUSED*/
public void opt_wheel_lines(int type, char *s)
{
switch (type)
{
case INIT:
case TOGGLE:
if (wheel_lines <= 0)
wheel_lines = default_wheel_lines();
break;
case QUERY:
break;
}
}
/*
* Handler for the --line-number-width option.
*/
/*ARGSUSED*/
public void opt_linenum_width(int type, char *s)
{
PARG parg;
switch (type)
{
case INIT:
case TOGGLE:
if (linenum_width > MAX_LINENUM_WIDTH)
{
parg.p_int = MAX_LINENUM_WIDTH;
error("Line number width must not be larger than %d", &parg);
linenum_width = MIN_LINENUM_WIDTH;
}
break;
case QUERY:
break;
}
}
/*
* Handler for the --status-column-width option.
*/
/*ARGSUSED*/
public void opt_status_col_width(int type, char *s)
{
PARG parg;
switch (type)
{
case INIT:
case TOGGLE:
if (status_col_width > MAX_STATUSCOL_WIDTH)
{
parg.p_int = MAX_STATUSCOL_WIDTH;
error("Status column width must not be larger than %d", &parg);
status_col_width = 2;
}
break;
case QUERY:
break;
}
}
/*
* Handler for the --file-size option.
*/
/*ARGSUSED*/
public void opt_filesize(int type, char *s)
{
switch (type)
{
case INIT:
case TOGGLE:
if (want_filesize && curr_ifile != NULL && ch_length() == NULL_POSITION)
scan_eof();
break;
case QUERY:
break;
}
}
/*
* Handler for the --intr option.
*/
/*ARGSUSED*/
public void opt_intr(int type, char *s)
{
PARG p;
switch (type)
{
case INIT:
case TOGGLE:
intr_char = *s;
if (intr_char == '^' && s[1] != '\0')
intr_char = CONTROL(s[1]);
break;
case QUERY: {
p.p_string = prchar(intr_char);
error("interrupt character is %s", &p);
break; }
}
}
/*
* Handler for the --header option.
*/
/*ARGSUSED*/
public void opt_header(int type, char *s)
{
int err;
int n;
switch (type)
{
case INIT:
case TOGGLE:
header_lines = 0;
header_cols = 0;
if (*s != ',')
{
n = getnum(&s, "header", &err);
if (err)
{
error("invalid number of lines", NULL_PARG);