ast@cs.vu.nl (Andy Tanenbaum) (10/06/87)
/*
* termcap.c 1.1 20/7/87 agc Joypace Ltd
*
* Copyright Joypace Ltd, London, UK, 1987. All rights reserved.
* This file may be freely distributed provided that this notice
* remains attached.
*
* A public domain implementation of the termcap(3) routines.
*/
#include <stdio.h>
#define CAPABLEN 2
#define ISSPACE(c) ((c) == ' ' || (c) == '\t' || (c) == '\r' || (c) == '\n')
#define ISDIGIT(x) ((x) >= '0' && (x) <= '9')
extern short ospeed; /* output speed */
extern char PC; /* padding character */
extern char *BC; /* back cursor movement */
extern char *UP; /* up cursor movement */
char *capab; /* the capability itself */
int incr; /* set by %i flag */
extern char *getenv(); /* new, improved getenv */
extern FILE *fopen(); /* old fopen */
/*
* tgetent - get the termcap entry for terminal name, and put it
* in bp (which must be an array of 1024 chars). Returns 1 if
* termcap entry found, 0 if not found, and -1 if file not found.
*/
int
tgetent(bp, name)
char *bp;
char *name;
{
FILE *fp;
char *file;
char *cp;
short len = strlen(name);
capab = bp;
if ((file = getenv("TERMCAP")) != (char *) NULL) {
if (*file != '/' &&
(cp = getenv("TERM")) != NULL && strcmp(name, cp) == 0) {
(void) strcpy(bp, file);
return(1);
}
} else
file = "/etc/termcap";
if ((fp = fopen(file, "r")) == (FILE *) NULL)
return(-1);
while (fgets(bp, 1024, fp) != NULL) {
/* skip V6 two letter name */
for (cp = bp ; *cp != '|' ; cp++)
;
for (++cp ; ISSPACE(*cp) ; cp++)
;
if (strncmp(name, cp, len) == 0) {
while (*(cp = &bp[strlen(bp) - 2]) == '\\')
fgets(cp, 1024, fp);
fclose(fp);
return(1);
}
}
fclose(fp);
return(0);
}
/*
* tgetnum - get the numeric terminal capability corresponding
* to id. Returns the value, -1 if invalid.
*/
int
tgetnum(id)
char *id;
{
char *cp;
int ret;
if ((cp = capab) == NULL || id == NULL)
return(-1);
while (*++cp != ':')
;
for (++cp ; *cp ; cp++) {
while (ISSPACE(*cp))
cp++;
if (strncmp(cp, id, CAPABLEN) == 0) {
while (*cp && *cp != ':' && *cp != '#')
cp++;
if (*cp != '#')
return(-1);
for (ret = 0, cp++ ; *cp && ISDIGIT(*cp) ; cp++)
ret = ret * 10 + *cp - '0';
return(ret);
}
while (*cp && *cp != ':')
cp++;
}
return(-1);
}
/*
* tgetflag - get the boolean flag corresponding to id. Returns -1
* if invalid, 0 if the flag is not in termcap entry, or 1 if it is
* present.
*/
int
tgetflag(id)
char *id;
{
char *cp;
if ((cp = capab) == NULL || id == NULL)
return(-1);
while (*++cp != ':')
;
for (++cp ; *cp ; cp++) {
while (ISSPACE(*cp))
cp++;
if (strncmp(cp, id, CAPABLEN) == 0)
return(1);
while (*cp && *cp != ':')
cp++;
}
return(0);
}
/*
* tgetstr - get the string capability corresponding to id and place
* it in area (advancing area at same time). Expand escape sequences
* etc. Returns the string, or NULL if it can't do it.
*/
char *
tgetstr(id, area)
char *id;
char **area;
{
char *cp;
char *ret;
int i;
if ((cp = capab) == NULL || id == NULL)
return(NULL);
while (*++cp != ':')
;
for (++cp ; *cp ; cp++) {
while (ISSPACE(*cp))
cp++;
if (strncmp(cp, id, CAPABLEN) == 0) {
while (*cp && *cp != ':' && *cp != '=')
cp++;
if (*cp != '=')
return(NULL);
for (ret = *area, cp++; *cp && *cp != ':' ; (*area)++, cp++)
switch(*cp) {
case '^' :
**area = *++cp - 'A';
break;
case '\\' :
switch(*++cp) {
case 'E' :
**area = '\033';
break;
case 'n' :
**area = '\n';
break;
case 'r' :
**area = '\r';
break;
case 't' :
**area = '\t';
break;
case 'b' :
**area = '\b';
break;
case 'f' :
**area = '\f';
break;
case '0' :
case '1' :
case '2' :
case '3' :
for (i=0 ; *cp && ISDIGIT(*cp) ; cp++)
i = i * 8 + *cp - '0';
**area = i;
cp--;
break;
case '^' :
case '\\' :
**area = *cp;
break;
}
break;
default :
**area = *cp;
}
*(*area)++ = '\0';
return(ret);
}
while (*cp && *cp != ':')
cp++;
}
return(NULL);
}
/*
* tgoto - given the cursor motion string cm, make up the string
* for the cursor to go to (destcol, destline), and return the string.
* Returns "OOPS" if something's gone wrong, or the string otherwise.
*/
char *
tgoto(cm, destcol, destline)
char *cm;
int destcol;
int destline;
{
register char *rp;
static char ret[24];
int *dp = &destcol;
int argno = 0, numval;
for (rp = ret ; *cm ; cm++) {
switch(*cm) {
case '%' :
switch(*++cm) {
case '+' :
if (dp == NULL)
return("OOPS");
*rp++ = *dp + *++cm;
dp = (dp == &destcol) ? &destline : NULL;
break;
case '%' :
*rp++ = '%';
break;
case 'i' :
incr = 1;
break;
case 'd' :
numval = (argno == 0 ? destline : destcol);
numval += incr;
argno++;
*rp++ = '0' + (numval/10);
*rp++ = '0' + (numval%10);
break;
}
break;
default :
*rp++ = *cm;
}
}
*rp = '\0';
return(ret);
}
/*
* tputs - put the string cp out onto the terminal, using the function
* outc. This should do padding for the terminal, but I can't find a
* terminal that needs padding at the moment...
*/
int
tputs(cp, affcnt, outc)
register char *cp;
int affcnt;
int (*outc)();
{
if (cp == NULL)
return(1);
/* do any padding interpretation - left null for MINIX just now */
while (*cp)
(*outc)(*cp++);
return(1);
}
/*
* That's all, folks...
*/