From: Sam Leffler Date: Tue, 28 Jun 1983 04:57:03 +0000 (-0800) Subject: date and time created 83/06/27 13:57:03 by sam X-Git-Tag: BSD-4_2-Snapshot-Development~1320 X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/commitdiff_plain/7bc051a7286d2399dc7a21f1b1fe477795a86ca3 date and time created 83/06/27 13:57:03 by sam SCCS-vsn: lib/libterm/termcap.c 4.1 --- diff --git a/usr/src/lib/libterm/termcap.c b/usr/src/lib/libterm/termcap.c new file mode 100644 index 0000000000..9a75bcdeb2 --- /dev/null +++ b/usr/src/lib/libterm/termcap.c @@ -0,0 +1,340 @@ +#ifndef lint +static char sccsid[] = "@(#)termcap.c 4.1 (Berkeley) %G%"; +#endif + +#define BUFSIZ 1024 +#define MAXHOP 32 /* max number of tc= indirections */ +#define E_TERMCAP "/etc/termcap" + +#include +/* + * termcap - routines for dealing with the terminal capability data base + * + * BUG: Should use a "last" pointer in tbuf, so that searching + * for capabilities alphabetically would not be a n**2/2 + * process when large numbers of capabilities are given. + * Note: If we add a last pointer now we will screw up the + * tc capability. We really should compile termcap. + * + * Essentially all the work here is scanning and decoding escapes + * in string capabilities. We don't use stdio because the editor + * doesn't, and because living w/o it is not hard. + */ + +static char *tbuf; +static int hopcount; /* detect infinite loops in termcap, init 0 */ +char *tskip(); +char *tgetstr(); +char *tdecode(); +char *getenv(); + +/* + * Get an entry for terminal name in buffer bp, + * from the termcap file. Parse is very rudimentary; + * we just notice escaped newlines. + */ +tgetent(bp, name) + char *bp, *name; +{ + register char *cp; + register int c; + register int i = 0, cnt = 0; + char ibuf[BUFSIZ]; + char *cp2; + int tf; + + tbuf = bp; + tf = 0; +#ifndef V6 + cp = getenv("TERMCAP"); + /* + * TERMCAP can have one of two things in it. It can be the + * name of a file to use instead of /etc/termcap. In this + * case it better start with a "/". Or it can be an entry to + * use so we don't have to read the file. In this case it + * has to already have the newlines crunched out. + */ + if (cp && *cp) { + if (*cp!='/') { + cp2 = getenv("TERM"); + if (cp2==(char *) 0 || strcmp(name,cp2)==0) { + strcpy(bp,cp); + return(tnchktc()); + } else { + tf = open(E_TERMCAP, 0); + } + } else + tf = open(cp, 0); + } + if (tf==0) + tf = open(E_TERMCAP, 0); +#else + tf = open(E_TERMCAP, 0); +#endif + if (tf < 0) + return (-1); + for (;;) { + cp = bp; + for (;;) { + if (i == cnt) { + cnt = read(tf, ibuf, BUFSIZ); + if (cnt <= 0) { + close(tf); + return (0); + } + i = 0; + } + c = ibuf[i++]; + if (c == '\n') { + if (cp > bp && cp[-1] == '\\'){ + cp--; + continue; + } + break; + } + if (cp >= bp+BUFSIZ) { + write(2,"Termcap entry too long\n", 23); + break; + } else + *cp++ = c; + } + *cp = 0; + + /* + * The real work for the match. + */ + if (tnamatch(name)) { + close(tf); + return(tnchktc()); + } + } +} + +/* + * tnchktc: check the last entry, see if it's tc=xxx. If so, + * recursively find xxx and append that entry (minus the names) + * to take the place of the tc=xxx entry. This allows termcap + * entries to say "like an HP2621 but doesn't turn on the labels". + * Note that this works because of the left to right scan. + */ +tnchktc() +{ + register char *p, *q; + char tcname[16]; /* name of similar terminal */ + char tcbuf[BUFSIZ]; + char *holdtbuf = tbuf; + int l; + + p = tbuf + strlen(tbuf) - 2; /* before the last colon */ + while (*--p != ':') + if (p MAXHOP) { + write(2, "Infinite tc= loop\n", 18); + return (0); + } + if (tgetent(tcbuf, tcname) != 1) + return(0); + for (q=tcbuf; *q != ':'; q++) + ; + l = p - holdtbuf + strlen(q); + if (l > BUFSIZ) { + write(2, "Termcap entry too long\n", 23); + q[BUFSIZ - (p-tbuf)] = 0; + } + strcpy(p, q+1); + tbuf = holdtbuf; + return(1); +} + +/* + * Tnamatch deals with name matching. The first field of the termcap + * entry is a sequence of names separated by |'s, so we compare + * against each such name. The normal : terminator after the last + * name (before the first field) stops us. + */ +tnamatch(np) + char *np; +{ + register char *Np, *Bp; + + Bp = tbuf; + if (*Bp == '#') + return(0); + for (;;) { + for (Np = np; *Np && *Bp == *Np; Bp++, Np++) + continue; + if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0)) + return (1); + while (*Bp && *Bp != ':' && *Bp != '|') + Bp++; + if (*Bp == 0 || *Bp == ':') + return (0); + Bp++; + } +} + +/* + * Skip to the next field. Notice that this is very dumb, not + * knowing about \: escapes or any such. If necessary, :'s can be put + * into the termcap file in octal. + */ +static char * +tskip(bp) + register char *bp; +{ + + while (*bp && *bp != ':') + bp++; + if (*bp == ':') + bp++; + return (bp); +} + +/* + * Return the (numeric) option id. + * Numeric options look like + * li#80 + * i.e. the option string is separated from the numeric value by + * a # character. If the option is not found we return -1. + * Note that we handle octal numbers beginning with 0. + */ +tgetnum(id) + char *id; +{ + register int i, base; + register char *bp = tbuf; + + for (;;) { + bp = tskip(bp); + if (*bp == 0) + return (-1); + if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1]) + continue; + if (*bp == '@') + return(-1); + if (*bp != '#') + continue; + bp++; + base = 10; + if (*bp == '0') + base = 8; + i = 0; + while (isdigit(*bp)) + i *= base, i += *bp++ - '0'; + return (i); + } +} + +/* + * Handle a flag option. + * Flag options are given "naked", i.e. followed by a : or the end + * of the buffer. Return 1 if we find the option, or 0 if it is + * not given. + */ +tgetflag(id) + char *id; +{ + register char *bp = tbuf; + + for (;;) { + bp = tskip(bp); + if (!*bp) + return (0); + if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) { + if (!*bp || *bp == ':') + return (1); + else if (*bp == '@') + return(0); + } + } +} + +/* + * Get a string valued option. + * These are given as + * cl=^Z + * Much decoding is done on the strings, and the strings are + * placed in area, which is a ref parameter which is updated. + * No checking on area overflow. + */ +char * +tgetstr(id, area) + char *id, **area; +{ + register char *bp = tbuf; + + for (;;) { + bp = tskip(bp); + if (!*bp) + return (0); + if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1]) + continue; + if (*bp == '@') + return(0); + if (*bp != '=') + continue; + bp++; + return (tdecode(bp, area)); + } +} + +/* + * Tdecode does the grung work to decode the + * string capability escapes. + */ +static char * +tdecode(str, area) + register char *str; + char **area; +{ + register char *cp; + register int c; + register char *dp; + int i; + + cp = *area; + while ((c = *str++) && c != ':') { + switch (c) { + + case '^': + c = *str++ & 037; + break; + + case '\\': + dp = "E\033^^\\\\::n\nr\rt\tb\bf\f"; + c = *str++; +nextc: + if (*dp++ == c) { + c = *dp++; + break; + } + dp++; + if (*dp) + goto nextc; + if (isdigit(c)) { + c -= '0', i = 2; + do + c <<= 3, c |= *str++ - '0'; + while (--i && isdigit(*str)); + } + break; + } + *cp++ = c; + } + *cp++ = 0; + str = *area; + *area = cp; + return (str); +}