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Annotation of 43BSDReno/pgrm/vgrind/vgrindefs.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: static char sccsid[] = "@(#)vgrindefs.c        5.3 (Berkeley) 6/1/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: #define        BUFSIZ  1024
        !            25: #define MAXHOP 32      /* max number of tc= indirections */
        !            26: 
        !            27: #include <ctype.h>
        !            28: /*
        !            29:  * grindcap - routines for dealing with the language definitions data base
        !            30:  *     (code stolen almost totally from termcap)
        !            31:  *
        !            32:  * BUG:                Should use a "last" pointer in tbuf, so that searching
        !            33:  *             for capabilities alphabetically would not be a n**2/2
        !            34:  *             process when large numbers of capabilities are given.
        !            35:  * Note:       If we add a last pointer now we will screw up the
        !            36:  *             tc capability. We really should compile termcap.
        !            37:  *
        !            38:  * Essentially all the work here is scanning and decoding escapes
        !            39:  * in string capabilities.  We don't use stdio because the editor
        !            40:  * doesn't, and because living w/o it is not hard.
        !            41:  */
        !            42: 
        !            43: static char *tbuf;
        !            44: static char *filename;
        !            45: static int hopcount;   /* detect infinite loops in termcap, init 0 */
        !            46: char   *tskip();
        !            47: char   *tgetstr();
        !            48: char   *tdecode();
        !            49: char   *getenv();
        !            50: 
        !            51: /*
        !            52:  * Get an entry for terminal name in buffer bp,
        !            53:  * from the termcap file.  Parse is very rudimentary;
        !            54:  * we just notice escaped newlines.
        !            55:  */
        !            56: tgetent(bp, name, file)
        !            57:        char *bp, *name, *file;
        !            58: {
        !            59:        register char *cp;
        !            60:        register int c;
        !            61:        register int i = 0, cnt = 0;
        !            62:        char ibuf[BUFSIZ];
        !            63:        char *cp2;
        !            64:        int tf;
        !            65: 
        !            66:        tbuf = bp;
        !            67:        tf = 0;
        !            68:        filename = file;
        !            69:        tf = open(filename, 0);
        !            70:        if (tf < 0)
        !            71:                return (-1);
        !            72:        for (;;) {
        !            73:                cp = bp;
        !            74:                for (;;) {
        !            75:                        if (i == cnt) {
        !            76:                                cnt = read(tf, ibuf, BUFSIZ);
        !            77:                                if (cnt <= 0) {
        !            78:                                        close(tf);
        !            79:                                        return (0);
        !            80:                                }
        !            81:                                i = 0;
        !            82:                        }
        !            83:                        c = ibuf[i++];
        !            84:                        if (c == '\n') {
        !            85:                                if (cp > bp && cp[-1] == '\\'){
        !            86:                                        cp--;
        !            87:                                        continue;
        !            88:                                }
        !            89:                                break;
        !            90:                        }
        !            91:                        if (cp >= bp+BUFSIZ) {
        !            92:                                write(2,"Vgrind entry too long\n", 23);
        !            93:                                break;
        !            94:                        } else
        !            95:                                *cp++ = c;
        !            96:                }
        !            97:                *cp = 0;
        !            98: 
        !            99:                /*
        !           100:                 * The real work for the match.
        !           101:                 */
        !           102:                if (tnamatch(name)) {
        !           103:                        close(tf);
        !           104:                        return(tnchktc());
        !           105:                }
        !           106:        }
        !           107: }
        !           108: 
        !           109: /*
        !           110:  * tnchktc: check the last entry, see if it's tc=xxx. If so,
        !           111:  * recursively find xxx and append that entry (minus the names)
        !           112:  * to take the place of the tc=xxx entry. This allows termcap
        !           113:  * entries to say "like an HP2621 but doesn't turn on the labels".
        !           114:  * Note that this works because of the left to right scan.
        !           115:  */
        !           116: tnchktc()
        !           117: {
        !           118:        register char *p, *q;
        !           119:        char tcname[16];        /* name of similar terminal */
        !           120:        char tcbuf[BUFSIZ];
        !           121:        char *holdtbuf = tbuf;
        !           122:        int l;
        !           123: 
        !           124:        p = tbuf + strlen(tbuf) - 2;    /* before the last colon */
        !           125:        while (*--p != ':')
        !           126:                if (p<tbuf) {
        !           127:                        write(2, "Bad vgrind entry\n", 18);
        !           128:                        return (0);
        !           129:                }
        !           130:        p++;
        !           131:        /* p now points to beginning of last field */
        !           132:        if (p[0] != 't' || p[1] != 'c')
        !           133:                return(1);
        !           134:        strcpy(tcname,p+3);
        !           135:        q = tcname;
        !           136:        while (q && *q != ':')
        !           137:                q++;
        !           138:        *q = 0;
        !           139:        if (++hopcount > MAXHOP) {
        !           140:                write(2, "Infinite tc= loop\n", 18);
        !           141:                return (0);
        !           142:        }
        !           143:        if (tgetent(tcbuf, tcname, filename) != 1)
        !           144:                return(0);
        !           145:        for (q=tcbuf; *q != ':'; q++)
        !           146:                ;
        !           147:        l = p - holdtbuf + strlen(q);
        !           148:        if (l > BUFSIZ) {
        !           149:                write(2, "Vgrind entry too long\n", 23);
        !           150:                q[BUFSIZ - (p-tbuf)] = 0;
        !           151:        }
        !           152:        strcpy(p, q+1);
        !           153:        tbuf = holdtbuf;
        !           154:        return(1);
        !           155: }
        !           156: 
        !           157: /*
        !           158:  * Tnamatch deals with name matching.  The first field of the termcap
        !           159:  * entry is a sequence of names separated by |'s, so we compare
        !           160:  * against each such name.  The normal : terminator after the last
        !           161:  * name (before the first field) stops us.
        !           162:  */
        !           163: tnamatch(np)
        !           164:        char *np;
        !           165: {
        !           166:        register char *Np, *Bp;
        !           167: 
        !           168:        Bp = tbuf;
        !           169:        if (*Bp == '#')
        !           170:                return(0);
        !           171:        for (;;) {
        !           172:                for (Np = np; *Np && *Bp == *Np; Bp++, Np++)
        !           173:                        continue;
        !           174:                if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0))
        !           175:                        return (1);
        !           176:                while (*Bp && *Bp != ':' && *Bp != '|')
        !           177:                        Bp++;
        !           178:                if (*Bp == 0 || *Bp == ':')
        !           179:                        return (0);
        !           180:                Bp++;
        !           181:        }
        !           182: }
        !           183: 
        !           184: /*
        !           185:  * Skip to the next field.  Notice that this is very dumb, not
        !           186:  * knowing about \: escapes or any such.  If necessary, :'s can be put
        !           187:  * into the termcap file in octal.
        !           188:  */
        !           189: static char *
        !           190: tskip(bp)
        !           191:        register char *bp;
        !           192: {
        !           193: 
        !           194:        while (*bp && *bp != ':')
        !           195:                bp++;
        !           196:        if (*bp == ':')
        !           197:                bp++;
        !           198:        return (bp);
        !           199: }
        !           200: 
        !           201: /*
        !           202:  * Return the (numeric) option id.
        !           203:  * Numeric options look like
        !           204:  *     li#80
        !           205:  * i.e. the option string is separated from the numeric value by
        !           206:  * a # character.  If the option is not found we return -1.
        !           207:  * Note that we handle octal numbers beginning with 0.
        !           208:  */
        !           209: tgetnum(id)
        !           210:        char *id;
        !           211: {
        !           212:        register int i, base;
        !           213:        register char *bp = tbuf;
        !           214: 
        !           215:        for (;;) {
        !           216:                bp = tskip(bp);
        !           217:                if (*bp == 0)
        !           218:                        return (-1);
        !           219:                if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
        !           220:                        continue;
        !           221:                if (*bp == '@')
        !           222:                        return(-1);
        !           223:                if (*bp != '#')
        !           224:                        continue;
        !           225:                bp++;
        !           226:                base = 10;
        !           227:                if (*bp == '0')
        !           228:                        base = 8;
        !           229:                i = 0;
        !           230:                while (isdigit(*bp))
        !           231:                        i *= base, i += *bp++ - '0';
        !           232:                return (i);
        !           233:        }
        !           234: }
        !           235: 
        !           236: /*
        !           237:  * Handle a flag option.
        !           238:  * Flag options are given "naked", i.e. followed by a : or the end
        !           239:  * of the buffer.  Return 1 if we find the option, or 0 if it is
        !           240:  * not given.
        !           241:  */
        !           242: tgetflag(id)
        !           243:        char *id;
        !           244: {
        !           245:        register char *bp = tbuf;
        !           246: 
        !           247:        for (;;) {
        !           248:                bp = tskip(bp);
        !           249:                if (!*bp)
        !           250:                        return (0);
        !           251:                if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
        !           252:                        if (!*bp || *bp == ':')
        !           253:                                return (1);
        !           254:                        else if (*bp == '@')
        !           255:                                return(0);
        !           256:                }
        !           257:        }
        !           258: }
        !           259: 
        !           260: /*
        !           261:  * Get a string valued option.
        !           262:  * These are given as
        !           263:  *     cl=^Z
        !           264:  * Much decoding is done on the strings, and the strings are
        !           265:  * placed in area, which is a ref parameter which is updated.
        !           266:  * No checking on area overflow.
        !           267:  */
        !           268: char *
        !           269: tgetstr(id, area)
        !           270:        char *id, **area;
        !           271: {
        !           272:        register char *bp = tbuf;
        !           273: 
        !           274:        for (;;) {
        !           275:                bp = tskip(bp);
        !           276:                if (!*bp)
        !           277:                        return (0);
        !           278:                if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
        !           279:                        continue;
        !           280:                if (*bp == '@')
        !           281:                        return(0);
        !           282:                if (*bp != '=')
        !           283:                        continue;
        !           284:                bp++;
        !           285:                return (tdecode(bp, area));
        !           286:        }
        !           287: }
        !           288: 
        !           289: /*
        !           290:  * Tdecode does the grung work to decode the
        !           291:  * string capability escapes.
        !           292:  */
        !           293: static char *
        !           294: tdecode(str, area)
        !           295:        register char *str;
        !           296:        char **area;
        !           297: {
        !           298:        register char *cp;
        !           299:        register int c;
        !           300:        int i;
        !           301: 
        !           302:        cp = *area;
        !           303:        while (c = *str++) {
        !           304:            if (c == ':' && *(cp-1) != '\\')
        !           305:                break;
        !           306:            *cp++ = c;
        !           307:        }
        !           308:        *cp++ = 0;
        !           309:        str = *area;
        !           310:        *area = cp;
        !           311:        return (str);
        !           312: }

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