src/termlib.c

/* vi:set ts=8 sts=4 sw=4: */
/*
 * The following software is (C) 1984 Peter da Silva, the Mad Australian, in
 * the public domain. It may be re-distributed for any purpose with the
 * inclusion of this notice.
 */

/* Modified by Bram Moolenaar for use with VIM - Vi Improved. */
/* A few bugs removed by Olaf 'Rhialto' Seibert. */

/* TERMLIB: Terminal independent database. */

#include "vim.h"
#include "termlib.pro"

#if !defined(AMIGA) && !defined(VMS) && !defined(MACOS)
# include <sgtty.h>
#endif

static int  getent(char *, char *, FILE *, int);
static int  nextent(char *, FILE *, int);
static int  _match(char *, char *);
static char *_addfmt(char *, char *, int);
static char *_find(char *, char *);

/*
 * Global variables for termlib
 */

char	*tent;		      /* Pointer to terminal entry, set by tgetent */
char	PC = 0;		      /* Pad character, default NULL */
char	*UP = 0, *BC = 0;     /* Pointers to UP and BC strings from database */
short	ospeed;		      /* Baud rate (1-16, 1=300, 16=19200), as in stty */

/*
 * Module: tgetent
 *
 * Purpose: Get termcap entry for <term> into buffer at <tbuf>.
 *
 * Calling conventions: char tbuf[TBUFSZ+], term=canonical name for terminal.
 *
 * Returned values: 1 = success, -1 = can't open file,
 *	    0 = can't find terminal.
 *
 * Notes:
 * - Should probably supply static buffer.
 * - Uses environment variables "TERM" and "TERMCAP". If TERM = term (that is,
 *   if the argument matches the environment) then it looks at TERMCAP.
 * - If TERMCAP begins with a slash, then it assumes this is the file to
 *   search rather than /etc/termcap.
 * - If TERMCAP does not begin with a slash, and it matches TERM, then this is
 *   used as the entry.
 * - This could be simplified considerably for non-UNIX systems.
 */

#ifndef TERMCAPFILE
# ifdef AMIGA
#  define TERMCAPFILE "s:termcap"
# else
#  ifdef VMS
#   define TERMCAPFILE "VIMRUNTIME:termcap"
#  else
#   define TERMCAPFILE "/etc/termcap"
#  endif
# endif
#endif

    int
tgetent(
    char    *tbuf,		/* Buffer to hold termcap entry, TBUFSZ bytes max */
    char    *term)		/* Name of terminal */
{
    char    tcbuf[32];		/* Temp buffer to handle */
    char    *tcptr = tcbuf;	/* extended entries */
    char    *tcap = TERMCAPFILE; /* Default termcap file */
    char    *tmp;
    FILE    *termcap;
    int	    retval = 0;
    int	    len;

    if ((tmp = (char *)mch_getenv((char_u *)"TERMCAP")) != NULL)
    {
	if (*tmp == '/')		/* TERMCAP = name of termcap file */
	{
	    tcap = tmp ;
#if defined(AMIGA)
	    /* Convert /usr/share/lib/termcap to usr:share/lib/termcap */
	    tcap++;
	    tmp = strchr(tcap, '/');
	    if (tmp)
		*tmp = ':';
#endif
	}
	else				/* TERMCAP = termcap entry itself */
	{
	    int tlen = strlen(term);

	    while (*tmp && *tmp != ':')		/* Check if TERM matches */
	    {
		char *nexttmp;

		while (*tmp == '|')
		    tmp++;
		nexttmp  = _find(tmp, ":|");	/* Rhialto */
		if (tmp+tlen == nexttmp && _match(tmp, term) == tlen)
		{
		    strcpy(tbuf, tmp);
		    tent = tbuf;
		    return 1;
		}
		else
		    tmp = nexttmp;
	    }
	}
    }
    if (!(termcap = mch_fopen(tcap, "r")))
    {
	strcpy(tbuf, tcap);
	return -1;
    }

    len = 0;
    while (getent(tbuf + len, term, termcap, TBUFSZ - len))
    {
	tcptr = tcbuf;				/* Rhialto */
	if ((term = tgetstr("tc", &tcptr)))	/* extended entry */
	{
	    rewind(termcap);
	    len = strlen(tbuf);
	}
	else
	{
	    retval = 1;
	    tent = tbuf;	/* reset it back to the beginning */
	    break;
	}
    }
    fclose(termcap);
    return retval;
}

    static int
getent(char *tbuf, char *term, FILE *termcap, int buflen)
{
    char    *tptr;
    int	    tlen = strlen(term);

    while (nextent(tbuf, termcap, buflen))	/* For each possible entry */
    {
	tptr = tbuf;
	while (*tptr && *tptr != ':')		/* : terminates name field */
	{
	    char    *nexttptr;

	    while (*tptr == '|')		/* | separates names */
		tptr++;
	    nexttptr = _find(tptr, ":|");	/* Rhialto */
	    if (tptr + tlen == nexttptr &&
		_match(tptr, term) == tlen)	/* FOUND! */
	    {
		tent = tbuf;
		return 1;
	    }
	    else				/* Look for next name */
		tptr = nexttptr;
	}
    }
    return 0;
}

/*
 * Read 1 entry from TERMCAP file.
 */
    static int
nextent(char *tbuf, FILE *termcap, int buflen)
{
    char *lbuf = tbuf;				/* lbuf=line buffer */
				/* read lines straight into buffer */

    while (lbuf < tbuf+buflen &&		/* There's room and */
	  fgets(lbuf, (int)(tbuf+buflen-lbuf), termcap)) /* another line */
    {
	int llen = strlen(lbuf);

	if (*lbuf == '#')			/* eat comments */
	    continue;
	if (lbuf[-1] == ':' &&			/* and whitespace */
	    lbuf[0] == '\t' &&
	    lbuf[1] == ':')
	{
	    STRMOVE(lbuf, lbuf + 2);
	    llen -= 2;
	}
	if (lbuf[llen-2] == '\\')		/* and continuations */
	    lbuf += llen-2;
	else
	{
	    lbuf[llen-1]=0;			/* no continuation, return */
	    return 1;
	}
    }

    return 0;					/* ran into end of file */
}

/*
 * Module: tgetflag
 *
 * Purpose: returns flag true or false as to the existence of a given entry.
 * used with 'bs', 'am', etc...
 *
 * Calling conventions: id is the 2 character capability id.
 *
 * Returned values: 1 for success, 0 for failure.
 */

    int
tgetflag(char *id)
{
    char    buf[256], *ptr = buf;

    return tgetstr(id, &ptr) ? 1 : 0;
}

/*
 * Module: tgetnum
 *
 * Purpose: get numeric value such as 'li' or 'co' from termcap.
 *
 * Calling conventions: id = 2 character id.
 *
 * Returned values: -1 for failure, else numerical value.
 */

    int
tgetnum(char *id)
{
    char *ptr, buf[256];
    ptr = buf;

    if (tgetstr(id, &ptr))
	return atoi(buf);
    else
	return 0;
}

/*
 * Module: tgetstr
 *
 * Purpose: get terminal capability string from database.
 *
 * Calling conventions: id is the two character capability id.
 *	    (*buf) points into a hold buffer for the
 *	    id. the capability is copied into the buffer
 *	    and (*buf) is advanced to point to the next
 *	    free byte in the buffer.
 *
 * Returned values: 0 = no such entry, otherwise returns original
 *	    (*buf) (now a pointer to the string).
 *
 * Notes
 *	It also decodes certain escape sequences in the buffer.
 *  they should be obvious from the code:
 *	\E = escape.
 *	\n, \r, \t, \f, \b match the 'c' escapes.
 *	^x matches control-x (^@...^_).
 *	\nnn matches nnn octal.
 *	\x, where x is anything else, matches x. I differ
 *  from the standard library here, in that I allow ^: to match
 *  :.
 *
 */

    char *
tgetstr(char *id, char **buf)
{
    int		len = strlen(id);
    char	*tmp=tent;
    char	*hold;
    int		i;

    do {
	tmp = _find(tmp, ":");			/* For each field */
	while (*tmp == ':')			/* skip empty fields */
	    tmp++;
	if (!*tmp)
	    break;

	if (_match(id, tmp) == len) {
	    tmp += len;				/* find '=' '@' or '#' */
	    if (*tmp == '@')			/* :xx@: entry for tc */
		return 0;			/* deleted entry */
	    hold= *buf;
	    while (*++tmp && *tmp != ':') {	/* not at end of field */
		switch(*tmp) {
		case '\\':			/* Expand escapes here */
		    switch(*++tmp) {
		    case 0:			/* ignore backslashes */
			tmp--;			/* at end of entry */
			break;			/* shouldn't happen */
		    case 'e':
		    case 'E':			/* ESC */
			*(*buf)++ = ESC;
			break;
		    case 'n':			/* \n */
			*(*buf)++ = '\n';
			break;
		    case 'r':			/* \r */
			*(*buf)++ = '\r';
			break;
		    case 't':			/* \t */
			*(*buf)++ = '\t';
			break;
		    case 'b':			/* \b */
			*(*buf)++ = '\b';
			break;
		    case 'f':			/* \f */
			*(*buf)++ = '\f';
			break;
		    case '0':			/* \nnn */
		    case '1':
		    case '2':
		    case '3':
		    case '4':
		    case '5':
		    case '6':
		    case '7':
		    case '8':
		    case '9':
			**buf = 0;
			    /* get up to three digits */
			for (i = 0; i < 3 && VIM_ISDIGIT(*tmp); ++i)
			    **buf = **buf * 8 + *tmp++ - '0';
			(*buf)++;
			tmp--;
			break;
		    default:			/* \x, for all other x */
			*(*buf)++= *tmp;
		    }
		    break;
		case '^':			/* control characters */
		    ++tmp;
		    *(*buf)++ = Ctrl_chr(*tmp);
		    break;
		default:
		    *(*buf)++ = *tmp;
		}
	    }
	    *(*buf)++ = 0;
	    return hold;
	}
    } while (*tmp);

    return 0;
}

/*
 * Module: tgoto
 *
 * Purpose: decode cm cursor motion string.
 *
 * Calling conventions: cm is cursor motion string.  line, col, are the
 * desired destination.
 *
 * Returned values: a string pointing to the decoded string, or "OOPS" if it
 * cannot be decoded.
 *
 * Notes
 *	The accepted escapes are:
 *	%d	 as in printf, 0 origin.
 *	%2, %3   like %02d, %03d in printf.
 *	%.	 like %c
 *	%+x	 adds <x> to value, then %.
 *	%>xy     if value>x, adds y. No output.
 *	%i	 increments line& col, no output.
 *	%r	 reverses order of line&col. No output.
 *	%%	 prints as a single %.
 *	%n	 exclusive or row & col with 0140.
 *	%B	 BCD, no output.
 *	%D	 reverse coding (x-2*(x%16)), no output.
 */

    char *
tgoto(
    char    *cm,				/* cm string, from termcap */
    int	    col,				/* column, x position */
    int	    line)				/* line, y position */
{
    char    gx, gy,				/* x, y */
	*ptr,					/* pointer in 'cm' */
	reverse = 0,				/* reverse flag */
	*bufp,					/* pointer in returned string */
	addup = 0,				/* add upline */
	addbak = 0,				/* add backup */
	c;
    static char buffer[32];

    if (!cm)
	return "OOPS";				/* Kludge, but standard */

    bufp = buffer;
    ptr = cm;

    while (*ptr) {
	if ((c = *ptr++) != '%') {		/* normal char */
	    *bufp++ = c;
	} else {				/* % escape */
	    switch(c = *ptr++) {
	    case 'd':				/* decimal */
		bufp = _addfmt(bufp, "%d", line);
		line = col;
		break;
	    case '2':				/* 2 digit decimal */
		bufp = _addfmt(bufp, "%02d", line);
		line = col;
		break;
	    case '3':				/* 3 digit decimal */
		bufp = _addfmt(bufp, "%03d", line);
		line = col;
		break;
	    case '>':				/* %>xy: if >x, add y */
		gx = *ptr++;
		gy = *ptr++;
		if (col>gx) col += gy;
		if (line>gx) line += gy;
		break;
	    case '+':				/* %+c: add c */
		line += *ptr++;
	    case '.':				/* print x/y */
		if (line == '\t' ||		/* these are */
		   line == '\n' ||		/* chars that */
		   line == '\004' ||		/* UNIX hates */
		   line == '\0') {
		    line++;			/* so go to next pos */
		    if (reverse == (line == col))
			addup=1;		/* and mark UP */
		    else
			addbak=1;		/* or BC */
		}
		*bufp++=line;
		line = col;
		break;
	    case 'r':				/* r: reverse */
		gx = line;
		line = col;
		col = gx;
		reverse = 1;
		break;
	    case 'i':			/* increment (1-origin screen) */
		col++;
		line++;
		break;
	    case '%':				/* %%=% literally */
		*bufp++='%';
		break;
	    case 'n':				/* magic DM2500 code */
		line ^= 0140;
		col ^= 0140;
		break;
	    case 'B':				/* bcd encoding */
		line = line/10<<4+line%10;
		col = col/10<<4+col%10;
		break;
	    case 'D':				/* magic Delta Data code */
		line = line-2*(line&15);
		col = col-2*(col&15);
		break;
	    default:				/* Unknown escape */
		return "OOPS";
	    }
	}
    }

    if (addup)					/* add upline */
	if (UP) {
	    ptr=UP;
	    while (VIM_ISDIGIT(*ptr) || *ptr == '.')
		ptr++;
	    if (*ptr == '*')
		ptr++;
	    while (*ptr)
		*bufp++ = *ptr++;
	}

    if (addbak)					/* add backspace */
	if (BC) {
	    ptr=BC;
	    while (VIM_ISDIGIT(*ptr) || *ptr == '.')
		ptr++;
	    if (*ptr == '*')
		ptr++;
	    while (*ptr)
		*bufp++ = *ptr++;
	}
	else
	    *bufp++='\b';

    *bufp = 0;

    return(buffer);
}

/*
 * Module: tputs
 *
 * Purpose: decode padding information
 *
 * Calling conventions: cp = string to be padded, affcnt = # of items affected
 *	(lines, characters, whatever), outc = routine to output 1 character.
 *
 * Returned values: none
 *
 * Notes
 *	cp has padding information ahead of it, in the form
 *  nnnTEXT or nnn*TEXT. nnn is the number of milliseconds to delay,
 *  and may be a decimal (nnn.mmm). If the asterisk is given, then
 *  the delay is multiplied by afcnt. The delay is produced by outputting
 *  a number of nulls (or other padding char) after printing the
 *  TEXT.
 *
 */

long _bauds[16]={
    0,	50, 75,	110,
    134,    150,    200,    300,
    600,    1200,   1800,   2400,
    4800,   9600,   19200,  19200 };

    int
tputs(
    char *cp,				/* string to print */
    int affcnt,				/* Number of lines affected */
    void (*outc)(unsigned int))		/* routine to output 1 character */
{
    long    frac,			/* 10^(#digits after decimal point) */
	counter,			/* digits */
	atol(const char *);

    if (VIM_ISDIGIT(*cp)) {
	counter = 0;
	frac = 1000;
	while (VIM_ISDIGIT(*cp))
	    counter = counter * 10L + (long)(*cp++ - '0');
	if (*cp == '.')
	    while (VIM_ISDIGIT(*++cp)) {
		counter = counter * 10L + (long)(*cp++ - '0');
		frac = frac * 10;
	    }
	if (*cp!='*') {			/* multiply by affected lines */
	    if (affcnt>1) affcnt = 1;
	}
	else
	    cp++;

	/* Calculate number of characters for padding counter/frac ms delay */
	if (ospeed)
	    counter = (counter * _bauds[ospeed] * (long)affcnt) / frac;

	while (*cp)			/* output string */
	    (*outc)(*cp++);
	if (ospeed)
	    while (counter--)		/* followed by pad characters */
		(*outc)(PC);
    }
    else
	while (*cp)
	    (*outc)(*cp++);
    return 0;
}

/*
 * Module: tutil.c
 *
 * Purpose: Utility routines for TERMLIB functions.
 * Returns length of text common to s1 and s2.
 */
    static int
_match(char *s1, char *s2)
{
    int i = 0;

    while (s1[i] && s1[i] == s2[i])
	i++;

    return i;
}

/*
 * finds next c in s that's a member of set, returns pointer
 */
    static char *
_find(char *s, char *set)
{
    for(; *s; s++)
    {
	char	*ptr = set;

	while (*ptr && *s != *ptr)
	    ptr++;

	if (*ptr)
	    return s;
    }

    return s;
}

/*
 * add val to buf according to format fmt
 */
    static char *
_addfmt(char *buf, char *fmt, int val)
{
    sprintf(buf, fmt, val);
    while (*buf)
	buf++;
    return buf;
}