minix/lib/libm2/XXTermcap.c
2005-04-21 14:53:53 +00:00

573 lines
10 KiB
C
Executable file

/*
* 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.
*
* Made fully functional by Ceriel J.H. Jacobs.
*
* BUGS:
* - does not check termcap entry sizes
* - not fully tested
*/
#define CAPABLEN 2
#define ISSPACE(c) ((c) == ' ' || (c) == '\t' || (c) == '\r' || (c) == '\n')
#define ISDIGIT(x) ((x) >= '0' && (x) <= '9')
short ospeed = 0; /* output speed */
char PC = 0; /* padding character */
char *BC = 0; /* back cursor movement */
char *UP = 0; /* up cursor movement */
static char *capab = 0; /* the capability itself */
static int check_for_tc();
static int match_name();
#define NULL 0
/* Some things from C-library, needed here because the C-library is not
loaded with Modula-2 programs
*/
static char *
strcat(s1, s2)
register char *s1, *s2;
{
/* Append s2 to the end of s1. */
char *original = s1;
/* Find the end of s1. */
while (*s1 != 0) s1++;
/* Now copy s2 to the end of s1. */
while (*s1++ = *s2++) /* nothing */ ;
return(original);
}
static char *
strcpy(s1, s2)
register char *s1, *s2;
{
/* Copy s2 to s1. */
char *original = s1;
while (*s1++ = *s2++) /* nothing */;
return(original);
}
static int
strlen(s)
char *s;
{
/* Return length of s. */
char *original = s;
while (*s != 0) s++;
return(s - original);
}
static int
strcmp(s1, s2)
register char *s1, *s2;
{
/* Compare 2 strings. */
for(;;) {
if (*s1 != *s2) {
if (!*s1) return -1;
if (!*s2) return 1;
return(*s1 - *s2);
}
if (*s1++ == 0) return(0);
s2++;
}
}
static int
strncmp(s1, s2, n)
register char *s1, *s2;
int n;
{
/* Compare two strings, but at most n characters. */
while (n-- > 0) {
if (*s1 != *s2) {
if (!*s1) return -1;
if (!*s2) return 1;
return(*s1 - *s2);
}
if (*s1++ == 0) break;
s2++;
}
return 0;
}
static char *
getenv(name)
register char *name;
{
extern char ***_penviron;
register char **v = *_penviron, *p, *q;
if (v == 0 || name == 0) return 0;
while ((p = *v++) != 0) {
q = name;
while (*q && *q++ == *p++) /* nothing */ ;
if (*q || *p != '=') continue;
return(p+1);
}
return(0);
}
static char *
fgets(buf, count, fd)
char *buf;
{
static char bf[1024];
static int cnt = 0;
static char *pbf = &bf[0];
register char *c = buf;
while (--count) {
if (pbf >= &bf[cnt]) {
if ((cnt = read(fd, bf, 1024)) <= 0) {
if (c == buf) return (char *) NULL;
*c = 0;
return buf;
}
pbf = &bf[0];
}
*c = *pbf++;
if (*c++ == '\n') {
*c = 0;
return buf;
}
}
*c = 0;
return buf;
}
/*
* 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;
{
int fp;
char *file;
char *cp;
short len = strlen(name);
char buf[1024];
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";
} else
file = "/etc/termcap";
if ((fp = open(file, 0)) < 0) {
capab = 0;
return(-1);
}
while (fgets(buf, 1024, fp) != NULL) {
if (buf[0] == '#') continue;
while (*(cp = &buf[strlen(buf) - 2]) == '\\')
if (fgets(cp, 1024, fp) == NULL)
return (0);
if (match_name(buf, name)) {
strcpy(bp, buf);
close(fp);
if(check_for_tc() == 0) {
capab = 0;
return 0;
}
return 1;
}
}
capab = 0;
close(fp);
return(0);
}
/*
* Compare the terminal name with each termcap entry name; Return 1 if a
* match is found.
*/
static int
match_name(buf, name)
char *buf;
char *name;
{
register char *tp = buf;
register char *np;
for (;;) {
for (np = name; *np && *tp == *np; np++, tp++) { }
if (*np == 0 && (*tp == '|' || *tp == ':' || *tp == 0))
return(1);
while (*tp != 0 && *tp != '|' && *tp != ':') tp++;
if (*tp++ != '|') return (0);
}
}
/*
* Handle tc= definitions recursively.
*/
static int
check_for_tc()
{
static int count = 0;
char *savcapab = capab;
char buf[1024];
char terminalname[128];
register char *p = capab + strlen(capab) - 2, *q;
while (*p != ':')
if (--p < capab)
return(0); /* no : in termcap entry */
if (p[1] != 't' || p[2] != 'c')
return(1);
if (count > 16) {
return(0); /* recursion in tc= definitions */
}
count++;
strcpy(terminalname, &p[4]);
q = terminalname;
while (*q && *q != ':') q++;
*q = 0;
if (tgetent(buf, terminalname) != 1) {
--count;
return(0);
}
--count;
for (q = buf; *q && *q != ':'; q++) { }
strcpy(p, q);
capab = savcapab;
return(1);
}
/*
* 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 || *cp == 0)
return(-1);
while (*++cp && *cp != ':')
;
while (*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 || *cp == 0)
return(-1);
while (*++cp && *cp != ':')
;
while (*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 || *cp == 0)
return(NULL);
while (*++cp != ':')
;
while (*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' + 1;
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[32];
char added[16];
int *dp = &destline;
int numval;
int swapped = 0;
added[0] = 0;
for (rp = ret ; *cm ; cm++) {
if (*cm == '%') {
switch(*++cm) {
case '>' :
if (dp == NULL)
return("OOPS");
cm++;
if (*dp > *cm++) {
*dp += *cm;
}
break;
case '+' :
case '.' :
if (dp == NULL)
return("OOPS");
if (*cm == '+') *dp = *dp + *++cm;
for (;;) {
switch(*dp) {
case 0:
case 04:
case '\t':
case '\n':
/* filter these out */
if (dp == &destcol || swapped || UP) {
strcat(added, dp == &destcol || swapped ?
(BC ? BC : "\b") :
UP);
(*dp)++;
continue;
}
}
break;
}
*rp++ = *dp;
dp = (dp == &destline) ? &destcol : NULL;
break;
case 'r' : {
int tmp = destline;
destline = destcol;
destcol = tmp;
swapped = 1 - swapped;
break;
}
case 'n' :
destcol ^= 0140;
destline ^= 0140;
break;
case '%' :
*rp++ = '%';
break;
case 'i' :
destcol++;
destline++;
break;
case 'B' :
if (dp == NULL)
return("OOPS");
*dp = 16 * (*dp / 10) + *dp % 10;
break;
case 'D' :
if (dp == NULL)
return("OOPS");
*dp = *dp - 2 * (*dp % 16);
break;
case 'd' :
case '2' :
case '3' :
if (dp == NULL)
return("OOPS");
numval = *dp;
dp = (dp == &destline) ? &destcol : NULL;
if (numval >= 100) {
*rp++ = '0' + numval / 100;
}
else if (*cm == '3') {
*rp++ = ' ';
}
if (numval >= 10) {
*rp++ = '0' + ((numval%100)/10);
}
else if (*cm == '3' || *cm == '2') {
*rp++ = ' ';
}
*rp++ = '0' + (numval%10);
break;
default :
return("OOPS");
}
}
else *rp++ = *cm;
}
*rp = '\0';
strcpy(rp, added);
return(ret);
}
static int tens_of_ms_p_char[] = { /* index as returned by gtty */
/* assume 10 bits per char */
0, 2000, 1333, 909, 743, 666, 500, 333, 166, 83, 55, 41, 20, 10, 5, 2
};
/*
* tputs - put the string cp out onto the terminal, using the function
* outc. Also handle padding.
*/
int
tputs(cp, affcnt, outc)
register char *cp;
int affcnt;
int (*outc)();
{
int delay = 0;
if (cp == NULL)
return(1);
while (ISDIGIT(*cp)) {
delay = delay * 10 + (*cp++ - '0');
}
delay *= 10;
if (*cp == '.') {
cp++;
if (ISDIGIT(*cp)) {
delay += *cp++ - '0';
}
while (ISDIGIT(*cp)) cp++;
}
if (*cp == '*') {
delay *= affcnt;
cp++;
}
while (*cp)
(*outc)(*cp++);
if (delay != 0 &&
ospeed > 0 &&
ospeed < (sizeof tens_of_ms_p_char / sizeof tens_of_ms_p_char[0])) {
delay = (delay + tens_of_ms_p_char[ospeed] - 1) /
tens_of_ms_p_char[ospeed];
while (delay--) (*outc)(PC);
}
return(1);
}
/*
* That's all, folks...
*/