unifdef/common/unifdef.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

/* Copyright (c) 1982 Regents of the University of California */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 *    unifdef - remove ifdef'ed lines
 */

#include <stdio.h>
#include <ctype.h>
#include <locale.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

FILE *input;
#ifndef YES
#define YES 1
#define NO  0
#endif

char *progname;
char *filename;
char text;      /* -t option in effect: this is a text file */
char lnblank;       /* -l option in effect: blank deleted lines */
char complement;    /* -c option in effect: complement the operation */
#define MAXSYMS 100
char true[MAXSYMS];
char ignore[MAXSYMS];
char *sym[MAXSYMS];
signed char insym[MAXSYMS];
#define KWSIZE 8
char buf[KWSIZE];
char nsyms;
char incomment;
#define QUOTE1 0
#define QUOTE2 1
char inquote[2];
int exitstat;

static char *skipcomment(char *cp);
static char *skipquote(char *cp, int type);
static char *nextsym(char *p);
static int doif(int thissym, int inif, int prevreject, int depth);
static void pfile(void);
static int getlin(char *line, int maxline, FILE *inp, int expandtabs);
static void prname(void);
static void flushline(int keep);
static int checkline(int *cursym);
static int error(int err, int line, int depth);
static void putlin(char *line, FILE *fio);

static void
usage(void)
{
    (void) fprintf(stderr, gettext(
        "Usage: %s [-l] [-t] [-c] [[-Dsym] [-Usym] [-idsym] "
        "[-iusym]]... [file]\n"
        "    At least one arg from [-D -U -id -iu] is required\n"),
        progname);
    exit(2);
}

int
main(int argc, char **argv)
{
    char **curarg;
    char *cp;
    char *cp1;
    char ignorethis;

    (void) setlocale(LC_ALL, "");

#if !defined(TEXT_DOMAIN)
#define TEXT_DOMAIN "SYS_TEST"
#endif
    (void) textdomain(TEXT_DOMAIN);

    progname = argv[0][0] ? argv[0] : "unifdef";

    for (curarg = &argv[1]; --argc > 0; curarg++) {
        if (*(cp1 = cp = *curarg) != '-')
            break;
        if (*++cp1 == 'i') {
            ignorethis = YES;
            cp1++;
        } else
            ignorethis = NO;
        if ((*cp1 == 'D' || *cp1 == 'U') &&
            cp1[1] != '\0') {
            if (nsyms >= MAXSYMS) {
                prname();
                (void) fprintf(stderr,
                    gettext("too many symbols.\n"));
                exit(2);
            }
            ignore[nsyms] = ignorethis;
            true[nsyms] = *cp1 == 'D' ? YES : NO;
            sym[nsyms++] = &cp1[1];
        } else if (ignorethis)
            goto unrec;
        else if (strcmp(&cp[1], "t") == 0)
            text = YES;
        else if (strcmp(&cp[1], "l") == 0)
            lnblank = YES;
        else if (strcmp(&cp[1], "c") == 0)
            complement = YES;
        else {
unrec:
            prname();
            (void) fprintf(stderr,
                gettext("unrecognized option: %s\n"), cp);
            usage();
        }
    }
    if (nsyms == 0) {
        usage();
    }

    if (argc > 1) {
        prname();
        (void) fprintf(stderr, gettext("can only do one file.\n"));
    } else if (argc == 1) {
        filename = *curarg;
        if ((input = fopen(filename, "r")) != NULL) {
            pfile();
            (void) fclose(input);
        } else {
            prname();
            perror(*curarg);
        }
    } else {
        filename = "[stdin]";
        input = stdin;
        pfile();
    }

    (void) fflush(stdout);
    return (exitstat);
}

/* types of input lines: */
#define PLAIN   0   /* ordinary line */
#define TRUE    1   /* a true  #ifdef of a symbol known to us */
#define FALSE   2   /* a false #ifdef of a symbol known to us */
#define OTHER   3   /* an #ifdef of a symbol not known to us */
#define ELSE    4   /* #else */
#define ENDIF   5   /* #endif */
#define LEOF    6   /* end of file */

/* should be int declaration, was char */
int reject;    /* 0 or 1: pass thru; 1 or 2: ignore comments */
int linenum;    /* current line number */
int stqcline;   /* start of current comment or quote */

char *errs[] = {
#define NO_ERR      0
            "",
#define END_ERR     1
            "",
#define ELSE_ERR    2
            "Inappropriate else",
#define ENDIF_ERR   3
            "Inappropriate endif",
#define IEOF_ERR    4
            "Premature EOF in ifdef",
#define CEOF_ERR    5
            "Premature EOF in comment",
#define Q1EOF_ERR   6
            "Premature EOF in quoted character",
#define Q2EOF_ERR   7
            "Premature EOF in quoted string"
};

static void
pfile(void)
{
    reject = 0;
    (void) doif(-1, NO, reject, 0);
}

static int
doif(
    int thissym,    /* index of the symbol who was last ifdef'ed */
    int inif,       /* YES or NO we are inside an ifdef */
    int prevreject, /* previous value of reject */
    int depth       /* depth of ifdef's */
)
{
    int lineval;
    int thisreject;
    int doret;  /* tmp return value of doif */
    int cursym; /* index of the symbol returned by checkline */
    int stline; /* line number when called this time */
    int err;

    stline = linenum;
    for (;;) {
        switch (lineval = checkline(&cursym)) {
        case PLAIN:
            flushline(YES);
            break;

        case TRUE:
        case FALSE:
            thisreject = reject;
            if (lineval == TRUE)
                insym[cursym] = 1;
            else {
                if (reject < 2)
                    reject = ignore[cursym] ? 1 : 2;
                insym[cursym] = -1;
            }
            if (ignore[cursym])
                flushline(YES);
            else {
                exitstat = 0;
                flushline(NO);
            }
            if ((doret = doif(cursym, YES,
                thisreject, depth + 1)) != NO_ERR)
                return (error(doret, stline, depth));
            break;

        case OTHER:
            flushline(YES);
            if ((doret = doif(-1, YES,
                reject, depth + 1)) != NO_ERR)
                return (error(doret, stline, depth));
            break;

        case ELSE:
            if (inif != 1)
                return (error(ELSE_ERR, linenum, depth));
            inif = 2;
            if (thissym >= 0) {
                if ((insym[thissym] = -insym[thissym]) < 0)
                    reject = ignore[thissym] ? 1 : 2;
                else
                    reject = prevreject;
                if (!ignore[thissym]) {
                    flushline(NO);
                    break;
                }
            }
            flushline(YES);
            break;

        case ENDIF:
            if (inif == 0)
                return (error(ENDIF_ERR, linenum, depth));
            if (thissym >= 0) {
                insym[thissym] = 0;
                reject = prevreject;
                if (!ignore[thissym]) {
                    flushline(NO);
                    return (NO_ERR);
                }
            }
            flushline(YES);
            return (NO_ERR);

        case LEOF:
            err = incomment
                ? CEOF_ERR
                : inquote[QUOTE1]
                ? Q1EOF_ERR
                : inquote[QUOTE2]
                ? Q2EOF_ERR
                : NO_ERR;
            if (inif) {
                if (err != NO_ERR)
                    (void) error(err, stqcline, depth);
                return (error(IEOF_ERR, stline, depth));
            } else if (err != NO_ERR)
                return (error(err, stqcline, depth));
            else
                return (NO_ERR);
        }
    }
}

#define endsym(c) (!isalpha(c) && !isdigit(c) && c != '_')

#define MAXLINE 256
char tline[MAXLINE];

static int
checkline(int *cursym)
{
    char *cp;
    char *symp;
    char chr;
    char *scp;
    int retval;
    int symind;
    char keyword[KWSIZE];

    linenum++;
    if (getlin(tline, sizeof (tline), input, NO) == EOF)
        return (LEOF);

    retval = PLAIN;
    if (*(cp = tline) != '#' || incomment ||
        inquote[QUOTE1] || inquote[QUOTE2])
        goto eol;

    cp = skipcomment(++cp);
    symp = keyword;
    while (!endsym (*cp)) {
        *symp = *cp++;
        if (++symp >= &keyword[KWSIZE])
            goto eol;
    }
    *symp = '\0';

    if (strcmp(keyword, "ifdef") == 0) {
        retval = YES;
        goto ifdef;
    } else if (strcmp(keyword, "if") == 0) {
        cp = skipcomment(++cp);
        if (strcmp(nextsym(cp), "defined") == 0) {
            cp += strlen("defined") + 1;
            /* skip to identifier */
            while (endsym(*cp))
                ++cp;
            retval = YES;
            goto ifdef;
        } else {
            retval = OTHER;
            goto eol;
        }
    } else if (strcmp(keyword, "ifndef") == 0) {
        retval = NO;
ifdef:
        scp = cp = skipcomment(cp);
        if (incomment) {
            retval = PLAIN;
            goto eol;
        }
        symind = 0;
        for (;;) {
            if (insym[symind] == 0) {
                for (symp = sym[symind], cp = scp;
                *symp && *cp == *symp; cp++, symp++) {
                    /* NULL */
                }
                chr = *cp;
                if (*symp == '\0' && endsym(chr)) {
                    *cursym = symind;
                    retval = (retval ^ true[symind]) ?
                        FALSE : TRUE;
                    break;
                }
            }
            if (++symind >= nsyms) {
                retval = OTHER;
                break;
            }
        }
    } else if (strcmp(keyword, "else") == 0)
        retval = ELSE;
    else if (strcmp(keyword, "endif") == 0)
        retval = ENDIF;

eol:
    if (!text && !reject)
        while (*cp) {
            if (incomment)
                cp = skipcomment(cp);
            else if (inquote[QUOTE1])
                cp = skipquote(cp, QUOTE1);
            else if (inquote[QUOTE2])
                cp = skipquote(cp, QUOTE2);
            else if (*cp == '/' && cp[1] == '*')
                cp = skipcomment(cp);
            else if (*cp == '\'')
                cp = skipquote(cp, QUOTE1);
            else if (*cp == '"')
                cp = skipquote(cp, QUOTE2);
            else
                cp++;
        }
    return (retval);
}

/*
 * Skip over comments and stop at the next character
 *  position that is not whitespace.
 */
static char *
skipcomment(char *cp)
{
    if (incomment)
        goto inside;
    for (;;) {
        while (*cp == ' ' || *cp == '\t')
            cp++;
        if (text)
            return (cp);
        if (cp[0] != '/' || cp[1] != '*')
            return (cp);
        cp += 2;
        if (!incomment) {
            incomment = YES;
            stqcline = linenum;
        }
inside:
        for (;;) {
            for (; *cp != '*'; cp++)
                if (*cp == '\0')
                    return (cp);
            if (*++cp == '/')
                break;
        }
        incomment = NO;
        cp++;
    }
}

/*
 * Skip over a quoted string or character and stop at the next charaacter
 *  position that is not whitespace.
 */
static char *
skipquote(char *cp, int type)
{
    char qchar;

    qchar = type == QUOTE1 ? '\'' : '"';

    if (inquote[type])
        goto inside;
    for (;;) {
        if (*cp != qchar)
            return (cp);
        cp++;
        if (!inquote[type]) {
            inquote[type] = YES;
            stqcline = linenum;
        }
inside:
        for (; ; cp++) {
            if (*cp == qchar)
                break;
            if (*cp == '\0' || *cp == '\\' && *++cp == '\0')
                return (cp);
        }
        inquote[type] = NO;
        cp++;
    }
}

/*
 *   special getlin - treats form-feed as an end-of-line
 *                    and expands tabs if asked for
 */
static int
getlin(char *line, int maxline, FILE *inp, int expandtabs)
{
    int tmp;
    int num;
    int chr;
#ifdef FFSPECIAL
    static char havechar = NO;  /* have leftover char from last time */
    static char svchar;
#endif

    num = 0;
#ifdef FFSPECIAL
    if (havechar) {
        havechar = NO;
        chr = svchar;
        goto ent;
    }
#endif
    while (num + 8 < maxline) {   /* leave room for tab */
        chr = getc(inp);
        if (isprint(chr)) {
#ifdef FFSPECIAL
ent:
#endif
            *line++ = chr;
            num++;
        } else
            switch (chr) {
            case EOF:
                return (EOF);

            case '\t':
                if (expandtabs) {
                    num += tmp = 8 - (num & 7);
                    do
                        *line++ = ' ';
                    while (--tmp);
                    break;
                }
            default:
                *line++ = chr;
                num++;
                break;

            case '\n':
                *line = '\n';
                num++;
                goto end;

#ifdef FFSPECIAL
            case '\f':
                if (++num == 1)
                    *line = '\f';
                else {
                    *line = '\n';
                    havechar = YES;
                    svchar = chr;
                }
                goto end;
#endif
            }
    }
end:
    *++line = '\0';
    return (num);
}

static void
flushline(int keep)
{
    if ((keep && reject < 2) ^ complement)
        putlin(tline, stdout);
    else if (lnblank)
        putlin("\n", stdout);
}

/*
 *  putlin - for tools
 */
static void
putlin(char *line, FILE *fio)
{
    char chr;

    while (chr = *line++)
        (void) putc(chr, fio);
}

static void
prname(void)
{
    (void) fprintf(stderr, "%s: ", progname);
}


static int
error(int err, int line, int depth)
{
    if (err == END_ERR)
        return (err);

    prname();

#ifndef TESTING
    (void) fprintf(stderr, gettext("Error in %s line %d: %s.\n"),
        filename, line, gettext(errs[err]));
#endif

#ifdef TESTING
    (void) fprintf(stderr, gettext("Error in %s line %d: %s. "),
        filename, line, errs[err]);
    (void) fprintf(stderr, gettext("ifdef depth: %d\n"), depth);
#endif

    exitstat = 1;
    return (depth > 1 ? IEOF_ERR : END_ERR);
}

/* return the next token in the line buffer */
char *
nextsym(char *p)
{
    char *key;
    int i = KWSIZE;

    key = buf;
    while (!endsym(*p) && --i)
        *key++ = *p++;
    *key = '\0';

    return (buf);
}