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Annotation of 43BSD/ucb/vgrind/vgrindefs.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)vgrindefs.c        5.1 (Berkeley) 6/5/85";
        !             9: #endif not lint
        !            10: 
        !            11: #define        BUFSIZ  1024
        !            12: #define MAXHOP 32      /* max number of tc= indirections */
        !            13: 
        !            14: #include <ctype.h>
        !            15: /*
        !            16:  * grindcap - routines for dealing with the language definitions data base
        !            17:  *     (code stolen almost totally from termcap)
        !            18:  *
        !            19:  * BUG:                Should use a "last" pointer in tbuf, so that searching
        !            20:  *             for capabilities alphabetically would not be a n**2/2
        !            21:  *             process when large numbers of capabilities are given.
        !            22:  * Note:       If we add a last pointer now we will screw up the
        !            23:  *             tc capability. We really should compile termcap.
        !            24:  *
        !            25:  * Essentially all the work here is scanning and decoding escapes
        !            26:  * in string capabilities.  We don't use stdio because the editor
        !            27:  * doesn't, and because living w/o it is not hard.
        !            28:  */
        !            29: 
        !            30: static char *tbuf;
        !            31: static char *filename;
        !            32: static int hopcount;   /* detect infinite loops in termcap, init 0 */
        !            33: char   *tskip();
        !            34: char   *tgetstr();
        !            35: char   *tdecode();
        !            36: char   *getenv();
        !            37: 
        !            38: /*
        !            39:  * Get an entry for terminal name in buffer bp,
        !            40:  * from the termcap file.  Parse is very rudimentary;
        !            41:  * we just notice escaped newlines.
        !            42:  */
        !            43: tgetent(bp, name, file)
        !            44:        char *bp, *name, *file;
        !            45: {
        !            46:        register char *cp;
        !            47:        register int c;
        !            48:        register int i = 0, cnt = 0;
        !            49:        char ibuf[BUFSIZ];
        !            50:        char *cp2;
        !            51:        int tf;
        !            52: 
        !            53:        tbuf = bp;
        !            54:        tf = 0;
        !            55:        filename = file;
        !            56:        tf = open(filename, 0);
        !            57:        if (tf < 0)
        !            58:                return (-1);
        !            59:        for (;;) {
        !            60:                cp = bp;
        !            61:                for (;;) {
        !            62:                        if (i == cnt) {
        !            63:                                cnt = read(tf, ibuf, BUFSIZ);
        !            64:                                if (cnt <= 0) {
        !            65:                                        close(tf);
        !            66:                                        return (0);
        !            67:                                }
        !            68:                                i = 0;
        !            69:                        }
        !            70:                        c = ibuf[i++];
        !            71:                        if (c == '\n') {
        !            72:                                if (cp > bp && cp[-1] == '\\'){
        !            73:                                        cp--;
        !            74:                                        continue;
        !            75:                                }
        !            76:                                break;
        !            77:                        }
        !            78:                        if (cp >= bp+BUFSIZ) {
        !            79:                                write(2,"Vgrind entry too long\n", 23);
        !            80:                                break;
        !            81:                        } else
        !            82:                                *cp++ = c;
        !            83:                }
        !            84:                *cp = 0;
        !            85: 
        !            86:                /*
        !            87:                 * The real work for the match.
        !            88:                 */
        !            89:                if (tnamatch(name)) {
        !            90:                        close(tf);
        !            91:                        return(tnchktc());
        !            92:                }
        !            93:        }
        !            94: }
        !            95: 
        !            96: /*
        !            97:  * tnchktc: check the last entry, see if it's tc=xxx. If so,
        !            98:  * recursively find xxx and append that entry (minus the names)
        !            99:  * to take the place of the tc=xxx entry. This allows termcap
        !           100:  * entries to say "like an HP2621 but doesn't turn on the labels".
        !           101:  * Note that this works because of the left to right scan.
        !           102:  */
        !           103: tnchktc()
        !           104: {
        !           105:        register char *p, *q;
        !           106:        char tcname[16];        /* name of similar terminal */
        !           107:        char tcbuf[BUFSIZ];
        !           108:        char *holdtbuf = tbuf;
        !           109:        int l;
        !           110: 
        !           111:        p = tbuf + strlen(tbuf) - 2;    /* before the last colon */
        !           112:        while (*--p != ':')
        !           113:                if (p<tbuf) {
        !           114:                        write(2, "Bad vgrind entry\n", 18);
        !           115:                        return (0);
        !           116:                }
        !           117:        p++;
        !           118:        /* p now points to beginning of last field */
        !           119:        if (p[0] != 't' || p[1] != 'c')
        !           120:                return(1);
        !           121:        strcpy(tcname,p+3);
        !           122:        q = tcname;
        !           123:        while (q && *q != ':')
        !           124:                q++;
        !           125:        *q = 0;
        !           126:        if (++hopcount > MAXHOP) {
        !           127:                write(2, "Infinite tc= loop\n", 18);
        !           128:                return (0);
        !           129:        }
        !           130:        if (tgetent(tcbuf, tcname, filename) != 1)
        !           131:                return(0);
        !           132:        for (q=tcbuf; *q != ':'; q++)
        !           133:                ;
        !           134:        l = p - holdtbuf + strlen(q);
        !           135:        if (l > BUFSIZ) {
        !           136:                write(2, "Vgrind entry too long\n", 23);
        !           137:                q[BUFSIZ - (p-tbuf)] = 0;
        !           138:        }
        !           139:        strcpy(p, q+1);
        !           140:        tbuf = holdtbuf;
        !           141:        return(1);
        !           142: }
        !           143: 
        !           144: /*
        !           145:  * Tnamatch deals with name matching.  The first field of the termcap
        !           146:  * entry is a sequence of names separated by |'s, so we compare
        !           147:  * against each such name.  The normal : terminator after the last
        !           148:  * name (before the first field) stops us.
        !           149:  */
        !           150: tnamatch(np)
        !           151:        char *np;
        !           152: {
        !           153:        register char *Np, *Bp;
        !           154: 
        !           155:        Bp = tbuf;
        !           156:        if (*Bp == '#')
        !           157:                return(0);
        !           158:        for (;;) {
        !           159:                for (Np = np; *Np && *Bp == *Np; Bp++, Np++)
        !           160:                        continue;
        !           161:                if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0))
        !           162:                        return (1);
        !           163:                while (*Bp && *Bp != ':' && *Bp != '|')
        !           164:                        Bp++;
        !           165:                if (*Bp == 0 || *Bp == ':')
        !           166:                        return (0);
        !           167:                Bp++;
        !           168:        }
        !           169: }
        !           170: 
        !           171: /*
        !           172:  * Skip to the next field.  Notice that this is very dumb, not
        !           173:  * knowing about \: escapes or any such.  If necessary, :'s can be put
        !           174:  * into the termcap file in octal.
        !           175:  */
        !           176: static char *
        !           177: tskip(bp)
        !           178:        register char *bp;
        !           179: {
        !           180: 
        !           181:        while (*bp && *bp != ':')
        !           182:                bp++;
        !           183:        if (*bp == ':')
        !           184:                bp++;
        !           185:        return (bp);
        !           186: }
        !           187: 
        !           188: /*
        !           189:  * Return the (numeric) option id.
        !           190:  * Numeric options look like
        !           191:  *     li#80
        !           192:  * i.e. the option string is separated from the numeric value by
        !           193:  * a # character.  If the option is not found we return -1.
        !           194:  * Note that we handle octal numbers beginning with 0.
        !           195:  */
        !           196: tgetnum(id)
        !           197:        char *id;
        !           198: {
        !           199:        register int i, base;
        !           200:        register char *bp = tbuf;
        !           201: 
        !           202:        for (;;) {
        !           203:                bp = tskip(bp);
        !           204:                if (*bp == 0)
        !           205:                        return (-1);
        !           206:                if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
        !           207:                        continue;
        !           208:                if (*bp == '@')
        !           209:                        return(-1);
        !           210:                if (*bp != '#')
        !           211:                        continue;
        !           212:                bp++;
        !           213:                base = 10;
        !           214:                if (*bp == '0')
        !           215:                        base = 8;
        !           216:                i = 0;
        !           217:                while (isdigit(*bp))
        !           218:                        i *= base, i += *bp++ - '0';
        !           219:                return (i);
        !           220:        }
        !           221: }
        !           222: 
        !           223: /*
        !           224:  * Handle a flag option.
        !           225:  * Flag options are given "naked", i.e. followed by a : or the end
        !           226:  * of the buffer.  Return 1 if we find the option, or 0 if it is
        !           227:  * not given.
        !           228:  */
        !           229: tgetflag(id)
        !           230:        char *id;
        !           231: {
        !           232:        register char *bp = tbuf;
        !           233: 
        !           234:        for (;;) {
        !           235:                bp = tskip(bp);
        !           236:                if (!*bp)
        !           237:                        return (0);
        !           238:                if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
        !           239:                        if (!*bp || *bp == ':')
        !           240:                                return (1);
        !           241:                        else if (*bp == '@')
        !           242:                                return(0);
        !           243:                }
        !           244:        }
        !           245: }
        !           246: 
        !           247: /*
        !           248:  * Get a string valued option.
        !           249:  * These are given as
        !           250:  *     cl=^Z
        !           251:  * Much decoding is done on the strings, and the strings are
        !           252:  * placed in area, which is a ref parameter which is updated.
        !           253:  * No checking on area overflow.
        !           254:  */
        !           255: char *
        !           256: tgetstr(id, area)
        !           257:        char *id, **area;
        !           258: {
        !           259:        register char *bp = tbuf;
        !           260: 
        !           261:        for (;;) {
        !           262:                bp = tskip(bp);
        !           263:                if (!*bp)
        !           264:                        return (0);
        !           265:                if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
        !           266:                        continue;
        !           267:                if (*bp == '@')
        !           268:                        return(0);
        !           269:                if (*bp != '=')
        !           270:                        continue;
        !           271:                bp++;
        !           272:                return (tdecode(bp, area));
        !           273:        }
        !           274: }
        !           275: 
        !           276: /*
        !           277:  * Tdecode does the grung work to decode the
        !           278:  * string capability escapes.
        !           279:  */
        !           280: static char *
        !           281: tdecode(str, area)
        !           282:        register char *str;
        !           283:        char **area;
        !           284: {
        !           285:        register char *cp;
        !           286:        register int c;
        !           287:        int i;
        !           288: 
        !           289:        cp = *area;
        !           290:        while (c = *str++) {
        !           291:            if (c == ':' && *(cp-1) != '\\')
        !           292:                break;
        !           293:            *cp++ = c;
        !           294:        }
        !           295:        *cp++ = 0;
        !           296:        str = *area;
        !           297:        *area = cp;
        !           298:        return (str);
        !           299: }

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