325 lines
6.9 KiB
C
325 lines
6.9 KiB
C
/*
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* termcap.c V1.1 20/7/87 agc Joypace Ltd
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*
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* Copyright Joypace Ltd, London, UK, 1987. All rights reserved.
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* This file may be freely distributed provided that this notice
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* remains attached.
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*
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* A public domain implementation of the termcap(3) routines.
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*
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*
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*
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* Klamer Schutte V1.2 Nov. 1988
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*
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* - Can match multiple terminal names [tgetent]
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* - Removal of **area assignments [tgetstr]
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*
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* Terrence W. Holm V1.3 May, Sep, Oct. 1988
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*
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* - Correct when TERM != name and TERMCAP is defined [tgetent]
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* - Correct the comparison for the terminal name [tgetent]
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* - Correct the value of ^x escapes [tgetstr]
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* - Added %r to reverse row/column [tgoto]
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* - Fixed end of definition test [tgetnum/flag/str]
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*
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* Terrence W. Holm V1.4 Jan. 1989
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*
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* - Incorporated Klamer's V1.2 fixes into V1.3
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* - Added %d, (old %d is now %2) [tgoto]
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* - Allow '#' comments in definition file [tgetent]
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*/
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#include <lib.h>
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#include <termcap.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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char *capab = (char *)NULL; /* the capability itself */
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#if 0
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/* The following are not yet used. */
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extern short ospeed; /* output speed */
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extern char PC; /* padding character */
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extern char *BC; /* back cursor movement */
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extern char *UP; /* up cursor movement */
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#endif
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/*
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* tgetent - get the termcap entry for terminal name, and put it
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* in bp (which must be an array of 1024 chars). Returns 1 if
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* termcap entry found, 0 if not found, and -1 if file not found.
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*/
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int tgetent(bp, name)
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char *bp;
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char *name;
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{
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FILE *fp;
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char *file;
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char *term;
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short len = strlen(name);
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capab = bp;
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/* If TERMCAP begins with a '/' then use TERMCAP as the path */
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/* Name of the termcap definitions file. If TERMCAP is a */
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/* Definition and TERM equals "name" then use TERMCAP as the */
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/* Definition. Otherwise use "/etc/termcap" as the path name. */
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if ((file = getenv("TERMCAP")) == (char *)NULL)
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file = "/etc/termcap";
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else if (*file != '/')
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if ((term = getenv("TERM")) != (char *)NULL && strcmp(term, name) == 0) {
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*bp = '\0';
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strncat(bp, file, 1023);
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return(1);
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} else
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file = "/etc/termcap";
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if ((fp = fopen(file, "r")) == (FILE *) NULL) {
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capab = (char *)NULL; /* no valid termcap */
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return(-1);
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}
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for (;;) {
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/* Read in each definition */
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int def_len = 0;
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char *cp = bp;
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do {
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if (fgets(&bp[def_len], (unsigned int)(1024 - def_len), fp) == (char *)NULL) {
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fclose(fp);
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capab = (char *)NULL; /* no valid termcap */
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return(0);
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}
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def_len = strlen(bp) - 2;
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} while (bp[def_len] == '\\');
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while (isspace(*cp)) cp++;
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/* Comment lines start with a '#' */
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if (*cp == '#') continue;
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/* See if any of the terminal names in this definition */
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/* Match "name". */
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do {
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if (strncmp(name, cp, len) == 0 &&
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(cp[len] == '|' || cp[len] == ':')) {
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fclose(fp);
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return(1);
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}
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while ((*cp) && (*cp != '|') && (*cp != ':')) cp++;
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} while (*cp++ == '|');
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}
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}
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/*
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* tgetnum - get the numeric terminal capability corresponding
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* to id. Returns the value, -1 if invalid.
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*/
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int tgetnum(id)
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char *id;
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{
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register char *cp = capab;
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if (cp == (char *)NULL || id == (char *)NULL) return(-1);
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for (;;) {
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while (*cp++ != ':')
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if (cp[-1] == '\0') return(-1);
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while (isspace(*cp)) cp++;
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if (strncmp(cp, id, 2) == 0 && cp[2] == '#') return(atoi(cp + 3));
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}
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}
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/*
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* tgetflag - get the boolean flag corresponding to id. Returns -1
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* if invalid, 0 if the flag is not in termcap entry, or 1 if it is
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* present.
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*/
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int tgetflag(id)
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char *id;
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{
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register char *cp = capab;
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if (cp == (char *)NULL || id == (char *)NULL) return(-1);
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for (;;) {
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while (*cp++ != ':')
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if (cp[-1] == '\0') return(0);
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while (isspace(*cp)) cp++;
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if (strncmp(cp, id, 2) == 0) return(1);
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}
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}
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/*
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* tgetstr - get the string capability corresponding to id and place
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* it in area (advancing area at same time). Expand escape sequences
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* etc. Returns the string, or NULL if it can't do it.
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*/
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char *tgetstr(id, area)
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char *id;
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char **area;
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{
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register char *cp = capab;
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register char *wsp = *area; /* workspace pointer */
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if (cp == (char *)NULL || id == (char *)NULL) return((char *)NULL);
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for (;;) {
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while (*cp++ != ':')
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if (cp[-1] == '\0') return((char *)NULL);
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while (isspace(*cp)) cp++;
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if (strncmp(cp, id, 2) == 0 && cp[2] == '=') {
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for (cp += 3; *cp && *cp != ':'; wsp++, cp++) switch (*cp) {
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case '^':
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*wsp = *++cp - '@';
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break;
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case '\\':
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switch (*++cp) {
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case 'E':
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*wsp = '\033';
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break;
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case 'n':
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*wsp = '\n';
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break;
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case 'r':
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*wsp = '\r';
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break;
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case 't':
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*wsp = '\t';
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break;
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case 'b':
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*wsp = '\b';
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break;
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case 'f':
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*wsp = '\f';
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break;
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case '0':
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case '1':
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case '2':
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case '3':
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{
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int i;
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int t = 0;
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for (i = 0; i < 3 &&
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isdigit(*cp); ++i, ++cp)
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t = t * 8 + *cp - '0';
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*wsp = t;
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cp--;
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break;
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}
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default:
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*wsp = *cp;
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}
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break;
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default: *wsp = *cp;
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}
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*wsp++ = '\0';
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{
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char *ret = *area;
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*area = wsp;
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return(ret);
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}
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}
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} /* end for(;;) */
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}
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/*
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* tgoto - given the cursor motion string cm, make up the string
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* for the cursor to go to (destcol, destline), and return the string.
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* Returns "OOPS" if something's gone wrong, or the string otherwise.
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*/
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char *tgoto(cm, destcol, destline)
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char *cm;
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int destcol;
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int destline;
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{
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PRIVATE char ret[24];
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char *rp = ret;
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int incr = 0;
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int argno = 0;
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int numval;
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for (; *cm; cm++) {
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if (*cm == '%') {
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switch (*++cm) {
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case 'i': incr = 1; break;
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case 'r': argno = 1; break;
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case '+':
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numval = (argno == 0 ? destline : destcol);
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*rp++ = numval + incr + *++cm;
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argno = 1 - argno;
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break;
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case '2':
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numval = (argno == 0 ? destline : destcol);
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numval = (numval + incr) % 100;
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*rp++ = '0' + (numval / 10);
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*rp++ = '0' + (numval % 10);
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argno = 1 - argno;
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break;
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case 'd':
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numval = (argno == 0 ? destline : destcol);
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numval = (numval + incr) % 1000;
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if (numval > 99) *rp++ = '0' + (numval / 100);
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if (numval > 9) *rp++ = '0' + (numval / 10) % 10;
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*rp++ = '0' + (numval % 10);
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argno = 1 - argno;
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break;
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case '%': *rp++ = '%'; break;
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default: return("OOPS");
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}
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} else
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*rp++ = *cm;
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}
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*rp = '\0';
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return(ret);
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}
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/*
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* tputs - put the string cp out onto the terminal, using the function
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* outc. This should do padding for the terminal, but I can't find a
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* terminal that needs padding at the moment...
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*/
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int tputs(cp, affcnt, outc)
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register char *cp;
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int affcnt;
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_PROTOTYPE( void (*outc), (int ch));
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{
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if (cp == (char *)NULL) return(1);
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/* Do any padding interpretation - left null for MINIX just now */
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while (*cp) (*outc) (*cp++);
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return(1);
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}
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