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Annotation of 43BSDTahoe/ucb/Mail/fmt.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 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 this notice is preserved and that due credit is given
        !             7:  * to the University of California at Berkeley. The name of the University
        !             8:  * may not be used to endorse or promote products derived from this
        !             9:  * software without specific prior written permission. This software
        !            10:  * is provided ``as is'' without express or implied warranty.
        !            11:  */
        !            12: 
        !            13: #ifndef lint
        !            14: char copyright[] =
        !            15: "@(#) Copyright (c) 1980 Regents of the University of California.\n\
        !            16:  All rights reserved.\n";
        !            17: #endif /* not lint */
        !            18: 
        !            19: #ifndef lint
        !            20: static char sccsid[] = "@(#)fmt.c      5.5 (Berkeley) 2/18/88";
        !            21: #endif /* not lint */
        !            22: 
        !            23: #include <stdio.h>
        !            24: #include <ctype.h>
        !            25: 
        !            26: /*
        !            27:  * fmt -- format the concatenation of input files or standard input
        !            28:  * onto standard output.  Designed for use with Mail ~|
        !            29:  *
        !            30:  * Syntax : fmt [ goal [ max ] ] [ name ... ]
        !            31:  * Authors: Kurt Shoens (UCB) 12/7/78;
        !            32:  *          Liz Allen (UMCP) 2/24/83 [Addition of goal length concept].
        !            33:  */
        !            34: 
        !            35: /* LIZ@UOM 6/18/85 -- Don't need LENGTH any more.
        !            36:  * #define     LENGTH  72              Max line length in output
        !            37:  */
        !            38: #define        NOSTR   ((char *) 0)    /* Null string pointer for lint */
        !            39: 
        !            40: /* LIZ@UOM 6/18/85 --New variables goal_length and max_length */
        !            41: int    goal_length = 65;       /* Target or goal line length in output */
        !            42: int    max_length = 75;        /* Max line length in output */
        !            43: int    pfx;                    /* Current leading blank count */
        !            44: int    lineno;                 /* Current input line */
        !            45: int    mark;                   /* Last place we saw a head line */
        !            46: 
        !            47: char   *malloc();              /* for lint . . . */
        !            48: char   *headnames[] = {"To", "Subject", "Cc", 0};
        !            49: 
        !            50: /*
        !            51:  * Drive the whole formatter by managing input files.  Also,
        !            52:  * cause initialization of the output stuff and flush it out
        !            53:  * at the end.
        !            54:  */
        !            55: 
        !            56: main(argc, argv)
        !            57:        int argc;
        !            58:        char **argv;
        !            59: {
        !            60:        register FILE *fi;
        !            61:        register int errs = 0;
        !            62:        int number;             /* LIZ@UOM 6/18/85 */
        !            63: 
        !            64:        setout();
        !            65:        lineno = 1;
        !            66:        mark = -10;
        !            67:        /*
        !            68:         * LIZ@UOM 6/18/85 -- Check for goal and max length arguments 
        !            69:         */
        !            70:        if (argc > 1 && (1 == (sscanf(argv[1], "%d", &number)))) {
        !            71:                argv++;
        !            72:                argc--;
        !            73:                goal_length = number;
        !            74:                if (argc > 1 && (1 == (sscanf(argv[1], "%d", &number)))) {
        !            75:                        argv++;
        !            76:                        argc--;
        !            77:                        max_length = number;
        !            78:                }
        !            79:        }
        !            80:        if (max_length <= goal_length) {
        !            81:                fprintf(stderr, "Max length must be greater than %s\n",
        !            82:                        "goal length");
        !            83:                exit(1);
        !            84:        }
        !            85:        if (argc < 2) {
        !            86:                fmt(stdin);
        !            87:                oflush();
        !            88:                exit(0);
        !            89:        }
        !            90:        while (--argc) {
        !            91:                if ((fi = fopen(*++argv, "r")) == NULL) {
        !            92:                        perror(*argv);
        !            93:                        errs++;
        !            94:                        continue;
        !            95:                }
        !            96:                fmt(fi);
        !            97:                fclose(fi);
        !            98:        }
        !            99:        oflush();
        !           100:        exit(errs);
        !           101: }
        !           102: 
        !           103: /*
        !           104:  * Read up characters from the passed input file, forming lines,
        !           105:  * doing ^H processing, expanding tabs, stripping trailing blanks,
        !           106:  * and sending each line down for analysis.
        !           107:  */
        !           108: fmt(fi)
        !           109:        FILE *fi;
        !           110: {
        !           111:        char linebuf[BUFSIZ], canonb[BUFSIZ];
        !           112:        register char *cp, *cp2;
        !           113:        register int c, col;
        !           114: 
        !           115:        c = getc(fi);
        !           116:        while (c != EOF) {
        !           117:                /*
        !           118:                 * Collect a line, doing ^H processing.
        !           119:                 * Leave tabs for now.
        !           120:                 */
        !           121:                cp = linebuf;
        !           122:                while (c != '\n' && c != EOF && cp-linebuf < BUFSIZ-1) {
        !           123:                        if (c == '\b') {
        !           124:                                if (cp > linebuf)
        !           125:                                        cp--;
        !           126:                                c = getc(fi);
        !           127:                                continue;
        !           128:                        }
        !           129:                        if ((c < ' ' || c >= 0177) && c != '\t') {
        !           130:                                c = getc(fi);
        !           131:                                continue;
        !           132:                        }
        !           133:                        *cp++ = c;
        !           134:                        c = getc(fi);
        !           135:                }
        !           136:                *cp = '\0';
        !           137: 
        !           138:                /*
        !           139:                 * Toss anything remaining on the input line.
        !           140:                 */
        !           141:                while (c != '\n' && c != EOF)
        !           142:                        c = getc(fi);
        !           143:                
        !           144:                /*
        !           145:                 * Expand tabs on the way to canonb.
        !           146:                 */
        !           147:                col = 0;
        !           148:                cp = linebuf;
        !           149:                cp2 = canonb;
        !           150:                while (c = *cp++) {
        !           151:                        if (c != '\t') {
        !           152:                                col++;
        !           153:                                if (cp2-canonb < BUFSIZ-1)
        !           154:                                        *cp2++ = c;
        !           155:                                continue;
        !           156:                        }
        !           157:                        do {
        !           158:                                if (cp2-canonb < BUFSIZ-1)
        !           159:                                        *cp2++ = ' ';
        !           160:                                col++;
        !           161:                        } while ((col & 07) != 0);
        !           162:                }
        !           163: 
        !           164:                /*
        !           165:                 * Swipe trailing blanks from the line.
        !           166:                 */
        !           167:                for (cp2--; cp2 >= canonb && *cp2 == ' '; cp2--)
        !           168:                        ;
        !           169:                *++cp2 = '\0';
        !           170:                prefix(canonb);
        !           171:                if (c != EOF)
        !           172:                        c = getc(fi);
        !           173:        }
        !           174: }
        !           175: 
        !           176: /*
        !           177:  * Take a line devoid of tabs and other garbage and determine its
        !           178:  * blank prefix.  If the indent changes, call for a linebreak.
        !           179:  * If the input line is blank, echo the blank line on the output.
        !           180:  * Finally, if the line minus the prefix is a mail header, try to keep
        !           181:  * it on a line by itself.
        !           182:  */
        !           183: prefix(line)
        !           184:        char line[];
        !           185: {
        !           186:        register char *cp, **hp;
        !           187:        register int np, h;
        !           188: 
        !           189:        if (strlen(line) == 0) {
        !           190:                oflush();
        !           191:                putchar('\n');
        !           192:                return;
        !           193:        }
        !           194:        for (cp = line; *cp == ' '; cp++)
        !           195:                ;
        !           196:        np = cp - line;
        !           197: 
        !           198:        /*
        !           199:         * The following horrible expression attempts to avoid linebreaks
        !           200:         * when the indent changes due to a paragraph.
        !           201:         */
        !           202:        if (np != pfx && (np > pfx || abs(pfx-np) > 8))
        !           203:                oflush();
        !           204:        if (h = ishead(cp))
        !           205:                oflush(), mark = lineno;
        !           206:        if (lineno - mark < 3 && lineno - mark > 0)
        !           207:                for (hp = &headnames[0]; *hp != (char *) 0; hp++)
        !           208:                        if (ispref(*hp, cp)) {
        !           209:                                h = 1;
        !           210:                                oflush();
        !           211:                                break;
        !           212:                        }
        !           213:        if (!h && (h = (*cp == '.')))
        !           214:                oflush();
        !           215:        pfx = np;
        !           216:        split(cp);
        !           217:        if (h)
        !           218:                oflush();
        !           219:        lineno++;
        !           220: }
        !           221: 
        !           222: /*
        !           223:  * Split up the passed line into output "words" which are
        !           224:  * maximal strings of non-blanks with the blank separation
        !           225:  * attached at the end.  Pass these words along to the output
        !           226:  * line packer.
        !           227:  */
        !           228: split(line)
        !           229:        char line[];
        !           230: {
        !           231:        register char *cp, *cp2;
        !           232:        char word[BUFSIZ];
        !           233:        int wordl;              /* LIZ@UOM 6/18/85 */
        !           234: 
        !           235:        cp = line;
        !           236:        while (*cp) {
        !           237:                cp2 = word;
        !           238:                wordl = 0;      /* LIZ@UOM 6/18/85 */
        !           239: 
        !           240:                /*
        !           241:                 * Collect a 'word,' allowing it to contain escaped white
        !           242:                 * space. 
        !           243:                 */
        !           244:                while (*cp && *cp != ' ') {
        !           245:                        if (*cp == '\\' && isspace(cp[1]))
        !           246:                                *cp2++ = *cp++;
        !           247:                        *cp2++ = *cp++;
        !           248:                        wordl++;/* LIZ@UOM 6/18/85 */
        !           249:                }
        !           250: 
        !           251:                /*
        !           252:                 * Guarantee a space at end of line. Two spaces after end of
        !           253:                 * sentence punctuation. 
        !           254:                 */
        !           255:                if (*cp == '\0') {
        !           256:                        *cp2++ = ' ';
        !           257:                        if (any(cp[-1], ".:!"))
        !           258:                                *cp2++ = ' ';
        !           259:                }
        !           260:                while (*cp == ' ')
        !           261:                        *cp2++ = *cp++;
        !           262:                *cp2 = '\0';
        !           263:                /*
        !           264:                 * LIZ@UOM 6/18/85 pack(word); 
        !           265:                 */
        !           266:                pack(word, wordl);
        !           267:        }
        !           268: }
        !           269: 
        !           270: /*
        !           271:  * Output section.
        !           272:  * Build up line images from the words passed in.  Prefix
        !           273:  * each line with correct number of blanks.  The buffer "outbuf"
        !           274:  * contains the current partial line image, including prefixed blanks.
        !           275:  * "outp" points to the next available space therein.  When outp is NOSTR,
        !           276:  * there ain't nothing in there yet.  At the bottom of this whole mess,
        !           277:  * leading tabs are reinserted.
        !           278:  */
        !           279: char   outbuf[BUFSIZ];                 /* Sandbagged output line image */
        !           280: char   *outp;                          /* Pointer in above */
        !           281: 
        !           282: /*
        !           283:  * Initialize the output section.
        !           284:  */
        !           285: setout()
        !           286: {
        !           287:        outp = NOSTR;
        !           288: }
        !           289: 
        !           290: /*
        !           291:  * Pack a word onto the output line.  If this is the beginning of
        !           292:  * the line, push on the appropriately-sized string of blanks first.
        !           293:  * If the word won't fit on the current line, flush and begin a new
        !           294:  * line.  If the word is too long to fit all by itself on a line,
        !           295:  * just give it its own and hope for the best.
        !           296:  *
        !           297:  * LIZ@UOM 6/18/85 -- If the new word will fit in at less than the
        !           298:  *     goal length, take it.  If not, then check to see if the line
        !           299:  *     will be over the max length; if so put the word on the next
        !           300:  *     line.  If not, check to see if the line will be closer to the
        !           301:  *     goal length with or without the word and take it or put it on
        !           302:  *     the next line accordingly.
        !           303:  */
        !           304: 
        !           305: /*
        !           306:  * LIZ@UOM 6/18/85 -- pass in the length of the word as well
        !           307:  * pack(word)
        !           308:  *     char word[];
        !           309:  */
        !           310: pack(word,wl)
        !           311:        char word[];
        !           312:        int wl;
        !           313: {
        !           314:        register char *cp;
        !           315:        register int s, t;
        !           316: 
        !           317:        if (outp == NOSTR)
        !           318:                leadin();
        !           319:        /*
        !           320:         * LIZ@UOM 6/18/85 -- change condition to check goal_length; s is the
        !           321:         * length of the line before the word is added; t is now the length
        !           322:         * of the line after the word is added
        !           323:         *      t = strlen(word);
        !           324:         *      if (t+s <= LENGTH) 
        !           325:         */
        !           326:        s = outp - outbuf;
        !           327:        t = wl + s;
        !           328:        if ((t <= goal_length) ||
        !           329:            ((t <= max_length) && (t - goal_length <= goal_length - s))) {
        !           330:                /*
        !           331:                 * In like flint! 
        !           332:                 */
        !           333:                for (cp = word; *cp; *outp++ = *cp++);
        !           334:                return;
        !           335:        }
        !           336:        if (s > pfx) {
        !           337:                oflush();
        !           338:                leadin();
        !           339:        }
        !           340:        for (cp = word; *cp; *outp++ = *cp++);
        !           341: }
        !           342: 
        !           343: /*
        !           344:  * If there is anything on the current output line, send it on
        !           345:  * its way.  Set outp to NOSTR to indicate the absence of the current
        !           346:  * line prefix.
        !           347:  */
        !           348: oflush()
        !           349: {
        !           350:        if (outp == NOSTR)
        !           351:                return;
        !           352:        *outp = '\0';
        !           353:        tabulate(outbuf);
        !           354:        outp = NOSTR;
        !           355: }
        !           356: 
        !           357: /*
        !           358:  * Take the passed line buffer, insert leading tabs where possible, and
        !           359:  * output on standard output (finally).
        !           360:  */
        !           361: tabulate(line)
        !           362:        char line[];
        !           363: {
        !           364:        register char *cp, *cp2;
        !           365:        register int b, t;
        !           366: 
        !           367:        /*
        !           368:         * Toss trailing blanks in the output line.
        !           369:         */
        !           370:        cp = line + strlen(line) - 1;
        !           371:        while (cp >= line && *cp == ' ')
        !           372:                cp--;
        !           373:        *++cp = '\0';
        !           374:        
        !           375:        /*
        !           376:         * Count the leading blank space and tabulate.
        !           377:         */
        !           378:        for (cp = line; *cp == ' '; cp++)
        !           379:                ;
        !           380:        b = cp-line;
        !           381:        t = b >> 3;
        !           382:        b &= 07;
        !           383:        if (t > 0)
        !           384:                do
        !           385:                        putc('\t', stdout);
        !           386:                while (--t);
        !           387:        if (b > 0)
        !           388:                do
        !           389:                        putc(' ', stdout);
        !           390:                while (--b);
        !           391:        while (*cp)
        !           392:                putc(*cp++, stdout);
        !           393:        putc('\n', stdout);
        !           394: }
        !           395: 
        !           396: /*
        !           397:  * Initialize the output line with the appropriate number of
        !           398:  * leading blanks.
        !           399:  */
        !           400: leadin()
        !           401: {
        !           402:        register int b;
        !           403:        register char *cp;
        !           404: 
        !           405:        for (b = 0, cp = outbuf; b < pfx; b++)
        !           406:                *cp++ = ' ';
        !           407:        outp = cp;
        !           408: }
        !           409: 
        !           410: /*
        !           411:  * Save a string in dynamic space.
        !           412:  * This little goodie is needed for
        !           413:  * a headline detector in head.c
        !           414:  */
        !           415: char *
        !           416: savestr(str)
        !           417:        char str[];
        !           418: {
        !           419:        register char *top;
        !           420: 
        !           421:        top = malloc(strlen(str) + 1);
        !           422:        if (top == NOSTR) {
        !           423:                fprintf(stderr, "fmt:  Ran out of memory\n");
        !           424:                exit(1);
        !           425:        }
        !           426:        strcpy(top, str);
        !           427:        return (top);
        !           428: }
        !           429: 
        !           430: /*
        !           431:  * Is s1 a prefix of s2??
        !           432:  */
        !           433: ispref(s1, s2)
        !           434:        register char *s1, *s2;
        !           435: {
        !           436: 
        !           437:        while (*s1++ == *s2)
        !           438:                ;
        !           439:        return (*s1 == '\0');
        !           440: }

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