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freebsd-dev/contrib/less/output.c
Xin LI 30a1828c51 less: upgrade to v590. 
MFC after:	2 weeks
2021-07-17 22:20:44 -07:00

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/*
* Copyright (C) 1984-2021 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.
*/
/*
* High level routines dealing with the output to the screen.
*/
#include "less.h"
#if MSDOS_COMPILER==WIN32C
#include "windows.h"
#ifndef COMMON_LVB_UNDERSCORE
#define COMMON_LVB_UNDERSCORE 0x8000
#endif
#endif
public int errmsgs; /* Count of messages displayed by error() */
public int need_clr;
public int final_attr;
public int at_prompt;
extern int sigs;
extern int sc_width;
extern int so_s_width, so_e_width;
extern int screen_trashed;
extern int is_tty;
extern int oldbot;
#if MSDOS_COMPILER==WIN32C || MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
extern int ctldisp;
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
extern int vt_enabled;
#endif
#endif
/*
* Display the line which is in the line buffer.
*/
public void
put_line(VOID_PARAM)
{
int c;
int i;
int a;
if (ABORT_SIGS())
{
/*
* Don't output if a signal is pending.
*/
screen_trashed = 1;
return;
}
final_attr = AT_NORMAL;
for (i = 0; (c = gline(i, &a)) != '\0'; i++)
{
at_switch(a);
final_attr = a;
if (c == '\b')
putbs();
else
putchr(c);
}
at_exit();
}
static char obuf[OUTBUF_SIZE];
static char *ob = obuf;
static int outfd = 2; /* stderr */
#if MSDOS_COMPILER==WIN32C || MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
static void
win_flush(VOID_PARAM)
{
if (ctldisp != OPT_ONPLUS || (vt_enabled && sgr_mode))
WIN32textout(obuf, ob - obuf);
else
{
/*
* Look for SGR escape sequences, and convert them
* to color commands. Replace bold, underline,
* and italic escapes into colors specified via
* the -D command-line option.
*/
char *anchor, *p, *p_next;
static int fg, fgi, bg, bgi;
static int at;
int f, b;
#if MSDOS_COMPILER==WIN32C
/* Screen colors used by 3x and 4x SGR commands. */
static unsigned char screen_color[] = {
0, /* BLACK */
FOREGROUND_RED,
FOREGROUND_GREEN,
FOREGROUND_RED|FOREGROUND_GREEN,
FOREGROUND_BLUE,
FOREGROUND_BLUE|FOREGROUND_RED,
FOREGROUND_BLUE|FOREGROUND_GREEN,
FOREGROUND_BLUE|FOREGROUND_GREEN|FOREGROUND_RED
};
#else
static enum COLORS screen_color[] = {
BLACK, RED, GREEN, BROWN,
BLUE, MAGENTA, CYAN, LIGHTGRAY
};
#endif
if (fg == 0 && bg == 0)
{
fg = nm_fg_color & 7;
fgi = nm_fg_color & 8;
bg = nm_bg_color & 7;
bgi = nm_bg_color & 8;
}
for (anchor = p_next = obuf;
(p_next = memchr(p_next, ESC, ob - p_next)) != NULL; )
{
p = p_next;
if (p[1] == '[') /* "ESC-[" sequence */
{
if (p > anchor)
{
/*
* If some chars seen since
* the last escape sequence,
* write them out to the screen.
*/
WIN32textout(anchor, p-anchor);
anchor = p;
}
p += 2; /* Skip the "ESC-[" */
if (is_ansi_end(*p))
{
/*
* Handle null escape sequence
* "ESC[m", which restores
* the normal color.
*/
p++;
anchor = p_next = p;
fg = nm_fg_color & 7;
fgi = nm_fg_color & 8;
bg = nm_bg_color & 7;
bgi = nm_bg_color & 8;
at = 0;
WIN32setcolors(nm_fg_color, nm_bg_color);
continue;
}
p_next = p;
at &= ~32;
/*
* Select foreground/background colors
* based on the escape sequence.
*/
while (!is_ansi_end(*p))
{
char *q;
long code = strtol(p, &q, 10);
if (*q == '\0')
{
/*
* Incomplete sequence.
* Leave it unprocessed
* in the buffer.
*/
int slop = (int) (q - anchor);
/* {{ strcpy args overlap! }} */
strcpy(obuf, anchor);
ob = &obuf[slop];
return;
}
if (q == p ||
code > 49 || code < 0 ||
(!is_ansi_end(*q) && *q != ';'))
{
p_next = q;
break;
}
if (*q == ';')
{
q++;
at |= 32;
}
switch (code)
{
default:
/* case 0: all attrs off */
fg = nm_fg_color & 7;
bg = nm_bg_color & 7;
at &= 32;
/*
* \e[0m use normal
* intensities, but
* \e[0;...m resets them
*/
if (at & 32)
{
fgi = 0;
bgi = 0;
} else
{
fgi = nm_fg_color & 8;
bgi = nm_bg_color & 8;
}
break;
case 1: /* bold on */
fgi = 8;
at |= 1;
break;
case 3: /* italic on */
case 7: /* inverse on */
at |= 2;
break;
case 4: /* underline on */
bgi = 8;
at |= 4;
break;
case 5: /* slow blink on */
case 6: /* fast blink on */
bgi = 8;
at |= 8;
break;
case 8: /* concealed on */
at |= 16;
break;
case 22: /* bold off */
fgi = 0;
at &= ~1;
break;
case 23: /* italic off */
case 27: /* inverse off */
at &= ~2;
break;
case 24: /* underline off */
bgi = 0;
at &= ~4;
break;
case 28: /* concealed off */
at &= ~16;
break;
case 30: case 31: case 32:
case 33: case 34: case 35:
case 36: case 37:
fg = screen_color[code - 30];
at |= 32;
break;
case 39: /* default fg */
fg = nm_fg_color & 7;
at |= 32;
break;
case 40: case 41: case 42:
case 43: case 44: case 45:
case 46: case 47:
bg = screen_color[code - 40];
at |= 32;
break;
case 49: /* default bg */
bg = nm_bg_color & 7;
at |= 32;
break;
}
p = q;
}
if (!is_ansi_end(*p) || p == p_next)
break;
/*
* In SGR mode, the ANSI sequence is
* always honored; otherwise if an attr
* is used by itself ("\e[1m" versus
* "\e[1;33m", for example), set the
* color assigned to that attribute.
*/
if (sgr_mode || (at & 32))
{
if (at & 2)
{
f = bg | bgi;
b = fg | fgi;
} else
{
f = fg | fgi;
b = bg | bgi;
}
} else
{
if (at & 1)
{
f = bo_fg_color;
b = bo_bg_color;
} else if (at & 2)
{
f = so_fg_color;
b = so_bg_color;
} else if (at & 4)
{
f = ul_fg_color;
b = ul_bg_color;
} else if (at & 8)
{
f = bl_fg_color;
b = bl_bg_color;
} else
{
f = nm_fg_color;
b = nm_bg_color;
}
}
if (at & 16)
f = b ^ 8;
#if MSDOS_COMPILER==WIN32C
f &= 0xf | COMMON_LVB_UNDERSCORE;
#else
f &= 0xf;
#endif
b &= 0xf;
WIN32setcolors(f, b);
p_next = anchor = p + 1;
} else
p_next++;
}
/* Output what's left in the buffer. */
WIN32textout(anchor, ob - anchor);
}
ob = obuf;
}
#endif
/*
* Flush buffered output.
*
* If we haven't displayed any file data yet,
* output messages on error output (file descriptor 2),
* otherwise output on standard output (file descriptor 1).
*
* This has the desirable effect of producing all
* error messages on error output if standard output
* is directed to a file. It also does the same if
* we never produce any real output; for example, if
* the input file(s) cannot be opened. If we do
* eventually produce output, code in edit() makes
* sure these messages can be seen before they are
* overwritten or scrolled away.
*/
public void
flush(VOID_PARAM)
{
int n;
n = (int) (ob - obuf);
if (n == 0)
return;
ob = obuf;
#if MSDOS_COMPILER==MSOFTC
if (interactive())
{
obuf[n] = '\0';
_outtext(obuf);
return;
}
#else
#if MSDOS_COMPILER==WIN32C || MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
if (interactive())
{
ob = obuf + n;
*ob = '\0';
win_flush();
return;
}
#endif
#endif
if (write(outfd, obuf, n) != n)
screen_trashed = 1;
}
/*
* Set the output file descriptor (1=stdout or 2=stderr).
*/
public void
set_output(fd)
int fd;
{
flush();
outfd = fd;
}
/*
* Output a character.
*/
public int
putchr(c)
int c;
{
#if 0 /* fake UTF-8 output for testing */
extern int utf_mode;
if (utf_mode)
{
static char ubuf[MAX_UTF_CHAR_LEN];
static int ubuf_len = 0;
static int ubuf_index = 0;
if (ubuf_len == 0)
{
ubuf_len = utf_len(c);
ubuf_index = 0;
}
ubuf[ubuf_index++] = c;
if (ubuf_index < ubuf_len)
return c;
c = get_wchar(ubuf) & 0xFF;
ubuf_len = 0;
}
#endif
clear_bot_if_needed();
#if MSDOS_COMPILER
if (c == '\n' && is_tty)
{
/* remove_top(1); */
putchr('\r');
}
#else
#ifdef _OSK
if (c == '\n' && is_tty) /* In OS-9, '\n' == 0x0D */
putchr(0x0A);
#endif
#endif
/*
* Some versions of flush() write to *ob, so we must flush
* when we are still one char from the end of obuf.
*/
if (ob >= &obuf[sizeof(obuf)-1])
flush();
*ob++ = c;
at_prompt = 0;
return (c);
}
public void
clear_bot_if_needed(VOID_PARAM)
{
if (!need_clr)
return;
need_clr = 0;
clear_bot();
}
/*
* Output a string.
*/
public void
putstr(s)
constant char *s;
{
while (*s != '\0')
putchr(*s++);
}
/*
* Convert an integral type to a string.
*/
#define TYPE_TO_A_FUNC(funcname, type) \
void funcname(num, buf) \
type num; \
char *buf; \
{ \
int neg = (num < 0); \
char tbuf[INT_STRLEN_BOUND(num)+2]; \
char *s = tbuf + sizeof(tbuf); \
if (neg) num = -num; \
*--s = '\0'; \
do { \
*--s = (num % 10) + '0'; \
} while ((num /= 10) != 0); \
if (neg) *--s = '-'; \
strcpy(buf, s); \
}
TYPE_TO_A_FUNC(postoa, POSITION)
TYPE_TO_A_FUNC(linenumtoa, LINENUM)
TYPE_TO_A_FUNC(inttoa, int)
/*
* Convert an string to an integral type.
*/
#define STR_TO_TYPE_FUNC(funcname, type) \
type funcname(buf, ebuf) \
char *buf; \
char **ebuf; \
{ \
type val = 0; \
for (;; buf++) { \
char c = *buf; \
if (c < '0' || c > '9') break; \
val = 10 * val + c - '0'; \
} \
if (ebuf != NULL) *ebuf = buf; \
return val; \
}
STR_TO_TYPE_FUNC(lstrtopos, POSITION)
STR_TO_TYPE_FUNC(lstrtoi, int)
/*
* Output an integer in a given radix.
*/
static int
iprint_int(num)
int num;
{
char buf[INT_STRLEN_BOUND(num)];
inttoa(num, buf);
putstr(buf);
return ((int) strlen(buf));
}
/*
* Output a line number in a given radix.
*/
static int
iprint_linenum(num)
LINENUM num;
{
char buf[INT_STRLEN_BOUND(num)];
linenumtoa(num, buf);
putstr(buf);
return ((int) strlen(buf));
}
/*
* This function implements printf-like functionality
* using a more portable argument list mechanism than printf's.
*
* {{ This paranoia about the portability of printf dates from experiences
* with systems in the 1980s and is of course no longer necessary. }}
*/
public int
less_printf(fmt, parg)
char *fmt;
PARG *parg;
{
char *s;
int col;
col = 0;
while (*fmt != '\0')
{
if (*fmt != '%')
{
putchr(*fmt++);
col++;
} else
{
++fmt;
switch (*fmt++)
{
case 's':
s = parg->p_string;
parg++;
while (*s != '\0')
{
putchr(*s++);
col++;
}
break;
case 'd':
col += iprint_int(parg->p_int);
parg++;
break;
case 'n':
col += iprint_linenum(parg->p_linenum);
parg++;
break;
case 'c':
putchr(parg->p_char);
col++;
break;
case '%':
putchr('%');
break;
}
}
}
return (col);
}
/*
* Get a RETURN.
* If some other non-trivial char is pressed, unget it, so it will
* become the next command.
*/
public void
get_return(VOID_PARAM)
{
int c;
#if ONLY_RETURN
while ((c = getchr()) != '\n' && c != '\r')
bell();
#else
c = getchr();
if (c != '\n' && c != '\r' && c != ' ' && c != READ_INTR)
ungetcc(c);
#endif
}
/*
* Output a message in the lower left corner of the screen
* and wait for carriage return.
*/
public void
error(fmt, parg)
char *fmt;
PARG *parg;
{
int col = 0;
static char return_to_continue[] = " (press RETURN)";
errmsgs++;
if (!interactive())
{
less_printf(fmt, parg);
putchr('\n');
return;
}
if (!oldbot)
squish_check();
at_exit();
clear_bot();
at_enter(AT_STANDOUT|AT_COLOR_ERROR);
col += so_s_width;
col += less_printf(fmt, parg);
putstr(return_to_continue);
at_exit();
col += sizeof(return_to_continue) + so_e_width;
get_return();
lower_left();
clear_eol();
if (col >= sc_width)
/*
* Printing the message has probably scrolled the screen.
* {{ Unless the terminal doesn't have auto margins,
* in which case we just hammered on the right margin. }}
*/
screen_trashed = 1;
flush();
}
static char intr_to_abort[] = "... (interrupt to abort)";
/*
* Output a message in the lower left corner of the screen
* and don't wait for carriage return.
* Usually used to warn that we are beginning a potentially
* time-consuming operation.
*/
public void
ierror(fmt, parg)
char *fmt;
PARG *parg;
{
at_exit();
clear_bot();
at_enter(AT_STANDOUT|AT_COLOR_ERROR);
(void) less_printf(fmt, parg);
putstr(intr_to_abort);
at_exit();
flush();
need_clr = 1;
}
/*
* Output a message in the lower left corner of the screen
* and return a single-character response.
*/
public int
query(fmt, parg)
char *fmt;
PARG *parg;
{
int c;
int col = 0;
if (interactive())
clear_bot();
(void) less_printf(fmt, parg);
c = getchr();
if (interactive())
{
lower_left();
if (col >= sc_width)
screen_trashed = 1;
flush();
} else
{
putchr('\n');
}
if (c == 'Q')
quit(QUIT_OK);
return (c);
}
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