lib/libpp/ppop.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1986-2011 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                 Eclipse Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*          http://www.eclipse.org/org/documents/epl-v10.html           *
*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * Glenn Fowler
 * AT&T Research
 *
 * preprocessor library control interface
 */

#include "pplib.h"
#include "pptab.h"

#include <ls.h>

#define REFONE  (pp.truncate?(Hash_table_t*)0:pp.symtab)
#define REFALL  (pp.truncate?pp.dirtab:pp.symtab)

#define ppiskey(t,v,p)  (p=t,v>=p->value&&value<=(p+elementsof(t)-2)->value)

/*
 * set option value
 * initialization files have lowest precedence
 */

int
ppset(register long* p, register long op, int val)
{
    long*   r;

    r = p == &pp.state ? &pp.ro_state : p == &pp.mode ? &pp.ro_mode : &pp.ro_option;
    if ((pp.mode & INIT) && pp.in->type == IN_FILE && (*r & op))
    {
        debug((-7, "set %s %s skipped -- readonly", p == &pp.state ? "state" : p == &pp.mode ? "mode" : "option", p == &pp.state ? ppstatestr(*r) : p == &pp.mode ? ppmodestr(*r) : ppoptionstr(*r)));
        return 0;
    }
    if (!pp.initialized && (!(pp.mode & INIT) || !(pp.mode & BUILTIN)) && (p != &pp.mode || !(op & BUILTIN)) && (p != &pp.option || !(op & PREDEFINED)))
    {
        *r |= op;
        debug((-7, "set %s %s readonly", p == &pp.state ? "state" : p == &pp.mode ? "mode" : "option", p == &pp.state ? ppstatestr(*r) : p == &pp.mode ? ppmodestr(*r) : ppoptionstr(*r)));
    }
    if (val)
        *p |= op;
    else
        *p &= ~op;
    debug((-7, "set %s %s", p == &pp.state ? "state" : p == &pp.mode ? "mode" : "option", p == &pp.state ? ppstatestr(*r) : p == &pp.mode ? ppmodestr(*r) : ppoptionstr(*r)));
    return 1;
}

/*
 * initialize hash table with keywords from key
 */

static void
inithash(register Hash_table_t* tab, register struct ppkeyword* key)
{
    register char*  s;

    for (; s = key->name; key++)
    {
        if (!ppisid(*s))
            s++;
        hashput(tab, s, key->value);
    }
}

/*
 * return ppkeyword table name given value
 */

char*
ppkeyname(register int value, int dir)
{
    register char*          s;
    register struct ppkeyword*  p;

    if (dir && ppiskey(directives, value, p) || !dir && (ppiskey(options, value, p) || ppiskey(predicates, value, p) || ppiskey(variables, value, p)))
    {
        s = (p + (value - p->value))->name;
        return s + !ppisid(*s);
    }
#if DEBUG
    error(PANIC, "no keyword table name for value=%d", value);
#endif
    return "UNKNOWN";
}

/*
 * add to the include maps
 */

void
ppmapinclude(char* file, register char* s)
{
    register int        c;
    register struct ppdirs* dp;
    int         fd;
    int         flags;
    int         index;
    int         token;
    char*           t;
    char*           old_file;
    long            old_state;
    struct ppfile*      fp;
    struct ppfile*      mp;

    old_file = error_info.file;
    old_state = pp.state;
    if (s)
        PUSH_BUFFER("mapinclude", s, 1);
    else if (file)
    {
        if (*file == '-')
        {
            if (!error_info.file)
            {
                error(1, "%s: input file name required for %s ignore", file, dirname(INCLUDE));
                return;
            }
            s = t = strcopy(pp.tmpbuf, error_info.file);
            c = *++file;
            for (;;)
            {
                if (s <= pp.tmpbuf || *s == '/')
                {
                    s = t;
                    break;
                }
                else if (*s == c)
                    break;
                s--;
            }
            strcpy(s, file);
            file = pp.tmpbuf;
        }
        if ((fd = ppsearch(file, INC_LOCAL, SEARCH_INCLUDE)) < 0)
            return;
        PUSH_FILE(file, fd);
    }
    else
        return;
#if CATSTRINGS
    pp.state |= (COMPILE|FILEPOP|HEADER|JOINING|STRIP|NOSPACE|PASSEOF);
#else
    pp.state |= (COMPILE|FILEPOP|HEADER|STRIP|NOSPACE|PASSEOF);
#endif
    pp.level++;
    flags = INC_MAPALL;
    fp = mp = 0;
    for (;;)
    {
        switch (token = pplex())
        {
        case 0:
        case T_STRING:
        case T_HEADER:
            if (fp)
            {
                fp->guard = INC_IGNORE;
                for (dp = pp.firstdir->next; dp; dp = dp->next)
                    if (dp->name && (c = strlen(dp->name)) && !strncmp(dp->name, fp->name, c) && fp->name[c] == '/')
                    {
                        ppsetfile(fp->name + c + 1)->guard = INC_IGNORE;
                        break;
                    }
            }
            if (!token)
                break;
            pathcanon(pp.token, 0, 0);
            fp = ppsetfile(pp.token);
            if (mp)
            {
                mp->flags |= flags;
                if (streq(fp->name, "."))
                    mp->flags |= INC_MAPNOLOCAL;
                else
                    mp->bound[index] = fp;

                fp = mp = 0;
            }
            else
                index = token == T_HEADER ? INC_STANDARD : INC_LOCAL;
            continue;
        case '=':
            if (!(mp = fp))
                error(3, "%s: \"name\" = \"binding\" expected");
            fp = 0;
            continue;
        case '\n':
            continue;
        case T_ID:
            if (streq(pp.token, "all"))
            {
                flags = INC_MAPALL;
                continue;
            }
            else if (streq(pp.token, "hosted"))
            {
                flags = INC_MAPHOSTED;
                continue;
            }
            else if (streq(pp.token, "nohosted"))
            {
                flags = INC_MAPNOHOSTED;
                continue;
            }
            /*FALLTHROUGH*/
        default:
            error(3, "%s unexpected in %s map list", pptokstr(pp.token, 0), dirname(INCLUDE));
            break;
        }
        break;
    }
    pp.level--;
    error_info.file = old_file;
    pp.state = old_state;
}

/*
 * return non-0 if file is identical to fd
 */

static int
identical(char* file, int fd)
{
    struct stat a;
    struct stat b;

    return !stat(file, &a) && !fstat(fd, &b) && a.st_dev == b.st_dev && a.st_ino == b.st_ino;
}

/*
 * compare up to pp.truncate chars
 *
 * NOTE: __STD* and symbols containing ' ' are not truncated
 */

static int
trunccomp(register char* a, register char* b)
{
    return !strchr(b, ' ') && !strneq(b, "__STD", 5) ? strncmp(a, b, pp.truncate) : strcmp(a, b);
}

/*
 * hash up to pp.truncate chars
 *
 * NOTE: __STD* and symbols containing ' ' are not truncated
 */

static unsigned int
trunchash(char* a)
{
    int n;

    return memhash(a, (n = strlen(a)) > pp.truncate && !strchr(a, ' ') && !strneq(a, "__STD", 5) ? pp.truncate : n);
}

#if DEBUG & TRACE_debug
/*
 * append context to debug trace
 */

static int
context(Sfio_t* sp, int level, int flags)
{
    static int  state;

    NoP(level);
    NoP(flags);
    if (error_info.trace <= -10 && pp.state != state)
    {
        state = pp.state;
        sfprintf(sp, " %s", ppstatestr(pp.state));
    }
    return 1;
}
#endif

/*
 * reset include guard
 */

static int
unguard(const char* name, char* v, void* handle)
{
    register struct ppfile*     fp = (struct ppfile*)v;

    fp->guard = 0;
    return 0;
}

/*
 * reset macro definition
 */

static void
undefine(void* p)
{
    struct ppmacro*     mac = ((struct ppsymbol*)p)->macro;

    if (mac)
    {
        if (mac->formals)
            free(mac->formals);
        free(mac->value);
        free(mac);
    }
}

/*
 * return non-zero if its ok to ppop(op)
 */

static int
ppok(int op)
{
    long        n;
    long*       r;

    r = &pp.ro_op[op >> 5];
    n = 1L << op;
    if ((pp.mode & INIT) && pp.in->type == IN_FILE && (*r & n))
    {
        debug((-7, "set op %d index %d skipped -- readonly", op, op >> 5));
        return 0;
    }
    else if (!pp.initialized && (!(pp.mode & INIT) || !(pp.mode & BUILTIN)))
    {
        *r |= n;
        debug((-7, "set op %d index %d readonly", op, op >> 5));
    }
    else
        debug((-7, "set op %d index %d", op, op >> 5));
    return 1;
}

/*
 * pp operations
 *
 * NOTE: PP_INIT must be done before the first pplex() call
 *   PP_DONE must be done after the last pplex() call
 *   PP_INIT-PP_DONE must be done for each new PP_INPUT
 */

void
ppop(int op, ...)
{
    va_list             ap;
    register char*          p;
    register struct ppkeyword*  kp;
    register char*          s;
    int             c;
    long                n;
    long*               r;
    char*               t;
    struct ppdirs*          dp;
    struct ppdirs*          hp;
    struct ppsymkey*        key;
    struct oplist*          xp;
    Sfio_t*             sp;
    struct stat         st;
    PPCOMMENT           ppcomment;
    PPLINESYNC          pplinesync;

    static int          initialized;

    va_start(ap, op);
    switch (op)
    {
    case PP_ASSERT:
    case PP_DEFINE:
    case PP_DIRECTIVE:
    case PP_OPTION:
    case PP_READ:
    case PP_UNDEF:
        if (pp.initialized)
            goto before;
        if ((p = va_arg(ap, char*)) && *p)
        {
            if (pp.lastop)
                pp.lastop = (pp.lastop->next = newof(0, struct oplist, 1, 0));
            else
                pp.firstop = pp.lastop = newof(0, struct oplist, 1, 0);
            pp.lastop->op = op;
            pp.lastop->value = p;
        }
        break;
    case PP_BUILTIN:
        pp.builtin = va_arg(ap, PPBUILTIN);
        break;
    case PP_CDIR:
        p = va_arg(ap, char*);
        c = va_arg(ap, int);
        pp.cdir.path = 0;
        if (!p)
            pp.c = c;
        else if (streq(p, "-"))
        {
            pp.c = c;
            for (dp = pp.firstdir; dp; dp = dp->next)
                dp->c = c;
        }
        else if (!pp.c)
        {
            if (!*p || stat((pathcanon(p, 0, 0), p), &st))
                pp.c = c;
            else
            {
                for (dp = pp.firstdir; dp; dp = dp->next)
                {
                    if (!pp.c && (dp->c || dp->name && SAMEID(&dp->id, &st)))
                        pp.c = 1;
                    dp->c = pp.c == 1;
                }
                if (!pp.c)
                {
                    pp.cdir.path = p;
                    SAVEID(&pp.cdir.id, &st);
                }
            }
        }
        break;
    case PP_CHOP:
        if (p = va_arg(ap, char*))
        {
            c = strlen(p);
            xp = newof(0, struct oplist, 1, c + 1);
            xp->value = ((char*)xp) + sizeof(struct oplist);
            s = xp->value;
            c = *p++;
            while (*p && *p != c)
                *s++ = *p++;
            *s++ = '/';
            xp->op = s - xp->value;
            *s++ = 0;
            if (*p && *++p && *p != c)
            {
                while (*p && *p != c)
                    *s++ = *p++;
                *s++ = '/';
            }
            *s = 0;
            xp->next = pp.chop;
            pp.chop = xp;
        }
        break;
    case PP_COMMENT:
        if (pp.comment = va_arg(ap, PPCOMMENT))
            pp.flags |= PP_comment;
        else
            pp.flags &= ~PP_comment;
        break;
    case PP_COMPATIBILITY:
        if (ppset(&pp.state, COMPATIBILITY, va_arg(ap, int)))
        {
#if COMPATIBLE
            if (pp.initialized)
                ppfsm(FSM_COMPATIBILITY, NiL);
#else
            if (pp.state & COMPATIBILITY)
                error(3, "preprocessor not compiled with compatibility dialect enabled [COMPATIBLE]");
#endif
            if (pp.state & COMPATIBILITY)
                pp.flags |= PP_compatibility;
            else
                pp.flags &= ~PP_compatibility;
        }
        break;
    case PP_COMPILE:
        if (pp.initialized)
            goto before;
        pp.state |= COMPILE;
        if (!pp.symtab)
            pp.symtab = hashalloc(NiL, HASH_name, "symbols", 0);
        if (kp = va_arg(ap, struct ppkeyword*))
            for (; s = kp->name; kp++)
        {
            n = SYM_LEX;
            switch (*s)
            {
            case '-':
                s++;
                break;
            case '+':
                s++;
                if (!(pp.option & PLUSPLUS))
                    break;
                /*FALLTHROUGH*/
            default:
                n |= SYM_KEYWORD;
                break;
            }
            if (key = ppkeyset(pp.symtab, s))
            {
                key->sym.flags = n;
                key->lex = kp->value;
            }
        }
        break;
    case PP_DEBUG:
        error_info.trace = va_arg(ap, int);
        break;
    case PP_DEFAULT:
        if (p = va_arg(ap, char*))
            p = strdup(p);
        if (pp.ppdefault)
            free(pp.ppdefault);
        pp.ppdefault = p;
        break;
    case PP_DONE:
#if CHECKPOINT
        if (pp.mode & DUMP)
            ppdump();
#endif
        if (pp.mode & FILEDEPS)
        {
            sfputc(pp.filedeps.sp, '\n');
            if (pp.filedeps.sp == sfstdout)
                sfsync(pp.filedeps.sp);
            else
                sfclose(pp.filedeps.sp);
        }
        if (pp.state & STANDALONE)
        {
            if ((pp.state & (NOTEXT|HIDDEN)) == HIDDEN && pplastout() != '\n')
                ppputchar('\n');
            ppflushout();
        }
        error_info.file = 0;
        break;
    case PP_DUMP:
        ppset(&pp.mode, DUMP, va_arg(ap, int));
#if !CHECKPOINT
        if (pp.mode & DUMP)
            error(3, "preprocessor not compiled with checkpoint enabled [CHECKPOINT]");
#endif
        break;
    case PP_FILEDEPS:
        if (n = va_arg(ap, int))
            pp.filedeps.flags |= n;
        else
            pp.filedeps.flags = 0;
        break;
    case PP_FILENAME:
        error_info.file = va_arg(ap, char*);
        break;
    case PP_HOSTDIR:
        if (!(pp.mode & INIT))
            pp.ro_mode |= HOSTED;
        else if (pp.ro_mode & HOSTED)
            break;
        pp.ro_mode |= INIT;
        p = va_arg(ap, char*);
        c = va_arg(ap, int);
        pp.hostdir.path = 0;
        if (!p)
            pp.hosted = c;
        else if (streq(p, "-"))
        {
            if (pp.initialized)
                ppset(&pp.mode, HOSTED, c);
            else
            {
                pp.hosted = c ? 1 : 2;
                for (dp = pp.firstdir; dp; dp = dp->next)
                    if (pp.hosted == 1)
                        dp->type |= TYPE_HOSTED;
                    else
                        dp->type &= ~TYPE_HOSTED;
            }
        }
        else if (!pp.hosted)
        {
            if (!*p || stat((pathcanon(p, 0, 0), p), &st))
                pp.hosted = 1;
            else
            {
                for (dp = pp.firstdir; dp; dp = dp->next)
                {
                    if (!pp.hosted && ((dp->type & TYPE_HOSTED) || dp->name && SAMEID(&dp->id, &st)))
                        pp.hosted = 1;
                    if (pp.hosted == 1)
                        dp->type |= TYPE_HOSTED;
                    else
                        dp->type &= ~TYPE_HOSTED;
                }
                if (!pp.hosted)
                {
                    pp.hostdir.path = p;
                    SAVEID(&pp.hostdir.id, &st);
                }
            }
        }
        break;
    case PP_ID:
        p = va_arg(ap, char*);
        c = va_arg(ap, int);
        if (p)
            ppfsm(c ? FSM_IDADD : FSM_IDDEL, p);
        break;
    case PP_IGNORE:
        if (p = va_arg(ap, char*))
        {
            pathcanon(p, 0, 0);
            ppsetfile(p)->guard = INC_IGNORE;
            message((-3, "%s: ignore", p));
        }
        break;
    case PP_IGNORELIST:
        if (pp.initialized)
            goto before;
        pp.ignore = va_arg(ap, char*);
        break;
    case PP_INCLUDE:
        if ((p = va_arg(ap, char*)) && *p)
        {
            pathcanon(p, 0, 0);
            if (stat(p, &st))
                break;
            for (dp = pp.stddirs; dp = dp->next;)
                if (dp->name && SAMEID(&dp->id, &st))
                    break;
            if (pp.cdir.path && SAMEID(&pp.cdir.id, &st))
            {
                pp.cdir.path = 0;
                pp.c = 1;
            }
            if (pp.hostdir.path && SAMEID(&pp.hostdir.id, &st))
            {
                pp.hostdir.path = 0;
                pp.hosted = 1;
            }
            if ((pp.mode & INIT) && !(pp.ro_mode & INIT))
                pp.hosted = 1;
            c = dp && dp->c || pp.c == 1;
            n = dp && (dp->type & TYPE_HOSTED) || pp.hosted == 1;
            if (!dp || dp == pp.lastdir->next)
            {
                if (dp)
                {
                    c = dp->c;
                    n = dp->type & TYPE_HOSTED;
                }
                dp = newof(0, struct ppdirs, 1, 0);
                dp->name = p;
                SAVEID(&dp->id, &st);
                dp->type |= TYPE_INCLUDE;
                dp->index = INC_LOCAL + pp.ignoresrc != 0;
                dp->next = pp.lastdir->next;
                pp.lastdir = pp.lastdir->next = dp;
            }
            dp->c = c;
            if (n)
                dp->type |= TYPE_HOSTED;
            else
                dp->type &= ~TYPE_HOSTED;
        }
        break;
    case PP_INCREF:
        pp.incref = va_arg(ap, PPINCREF);
        break;
    case PP_RESET:
        pp.reset.on = 1;
        break;
    case PP_INIT:
        if (pp.initialized)
        {
            error_info.errors = 0;
            error_info.warnings = 0;
        }
        else
        {
            /*
             * context initialization
             */

            if (!initialized)
            {
                /*
                 * out of malloc is fatal
                 */

                memfatal();

                /*
                 * initialize the error message interface
                 */

                error_info.version = (char*)pp.version;
#if DEBUG & TRACE_debug
                error_info.auxilliary = context;
                pptrace(0);
#endif

                /*
                 * initialize pplex tables
                 */

                ppfsm(FSM_INIT, NiL);

                /*
                 * fixed macro stack size -- room for improvement
                 */

                pp.macp = newof(0, struct ppmacstk, DEFMACSTACK, 0);
                pp.macp->next = pp.macp + 1;
                pp.maxmac = (char*)pp.macp + DEFMACSTACK;
                initialized = 1;

                /*
                 * initial include/if control stack
                 */

                pp.control = newof(0, long, pp.constack, 0);
                pp.maxcon = pp.control + pp.constack - 1;
            }

            /*
             * validate modes
             */

            switch (pp.arg_mode)
            {
            case 'a':
            case 'C':
                ppop(PP_COMPATIBILITY, 0);
                ppop(PP_TRANSITION, 1);
                break;
            case 'A':
            case 'c':
                ppop(PP_COMPATIBILITY, 0);
                ppop(PP_STRICT, 1);
                break;
            case 'f':
                ppop(PP_COMPATIBILITY, 1);
                ppop(PP_PLUSPLUS, 1);
                ppop(PP_TRANSITION, 1);
                break;
            case 'F':
                ppop(PP_COMPATIBILITY, 0);
                ppop(PP_PLUSPLUS, 1);
                break;
            case 'k':
            case 's':
                ppop(PP_COMPATIBILITY, 1);
                ppop(PP_STRICT, 1);
                break;
            case 'o':
            case 'O':
                ppop(PP_COMPATIBILITY, 1);
                ppop(PP_TRANSITION, 0);
                break;
            case 't':
                ppop(PP_COMPATIBILITY, 1);
                ppop(PP_TRANSITION, 1);
                break;
            }
            if (!(pp.state & WARN) && !(pp.arg_style & STYLE_gnu))
                ppop(PP_PEDANTIC, 1);
            if (pp.state & PASSTHROUGH)
            {
                if (pp.state & COMPILE)
                {
                    pp.state &= ~PASSTHROUGH;
                    error(1, "passthrough ignored for compile");
                }
                else
                {
                    ppop(PP_COMPATIBILITY, 1);
                    ppop(PP_HOSTDIR, "-", 1);
                    ppop(PP_SPACEOUT, 1);
                    ppset(&pp.state, DISABLE, va_arg(ap, int));
                }
            }

            /*
             * create the hash tables
             */

            if (!pp.symtab)
                pp.symtab = hashalloc(NiL, HASH_name, "symbols", 0);
            if (!pp.dirtab)
            {
                pp.dirtab = hashalloc(REFONE, HASH_name, "directives", 0);
                inithash(pp.dirtab, directives);
            }
            if (!pp.filtab)
                pp.filtab = hashalloc(REFALL, HASH_name, "files", 0);
            if (!pp.prdtab)
                pp.prdtab = hashalloc(REFALL, HASH_name, "predicates", 0);
            if (!pp.strtab)
            {
                pp.strtab = hashalloc(REFALL, HASH_name, "strings", 0);
                inithash(pp.strtab, options);
                inithash(pp.strtab, predicates);
                inithash(pp.strtab, variables);
            }
            pp.optflags[X_PROTOTYPED] = OPT_GLOBAL;
            pp.optflags[X_SYSTEM_HEADER] = OPT_GLOBAL|OPT_PASS;

            /*
             * mark macros that are builtin predicates
             */

            for (kp = predicates; s = kp->name; kp++)
            {
                if (!ppisid(*s))
                    s++;
                ppassert(DEFINE, s, 0);
            }

            /*
             * the remaining entry names must be allocated
             */

            hashset(pp.dirtab, HASH_ALLOCATE);
            hashset(pp.filtab, HASH_ALLOCATE);
            hashset(pp.prdtab, HASH_ALLOCATE);
            hashset(pp.strtab, HASH_ALLOCATE);
            hashset(pp.symtab, HASH_ALLOCATE);
            if (pp.test & TEST_nonoise)
            {
                c = error_info.trace;
                error_info.trace = 0;
            }
#if DEBUG
            if (!(pp.test & TEST_noinit))
            {
#endif

            /*
             * compose, push and read the builtin initialization script
             */

            if (!(sp = sfstropen()))
                error(3, "temporary buffer allocation error");
            sfprintf(sp,
"\
#%s %s:%s \"/#<assert> /\" \"/assert /%s #/\"\n\
#%s %s:%s \"/#<unassert> /\" \"/unassert /%s #/\"\n\
",
                dirname(PRAGMA),
                pp.pass,
                keyname(X_MAP),
                dirname(DEFINE),
                dirname(PRAGMA),
                pp.pass,
                keyname(X_MAP),
                dirname(UNDEF));
            if (pp.ppdefault && *pp.ppdefault)
            {
                if (pp.probe)
                {
                    c = pp.lastdir->next->type;
                    pp.lastdir->next->type = 0;
                }
                if (ppsearch(pp.ppdefault, T_STRING, SEARCH_EXISTS) < 0)
                {
                    free(pp.ppdefault);
                    if (!(pp.ppdefault = pathprobe("C", pp.pass, pp.probe ? pp.probe : PPPROBE, 0, pp.path, MAXTOKEN + 1, NiL, 0)))
                        error(1, "cannot determine default definitions for %s", pp.probe ? pp.probe : PPPROBE);
                }
                if (pp.probe)
                    pp.lastdir->next->type = c;
            }
            while (pp.firstop)
            {
                switch (pp.firstop->op)
                {
                case PP_ASSERT:
                    sfprintf(sp, "#%s #%s\n", dirname(DEFINE), pp.firstop->value);
                    break;
                case PP_DEFINE:
                    if (*pp.firstop->value == '#')
                        sfprintf(sp, "#%s %s\n", dirname(DEFINE), pp.firstop->value);
                    else
                    {
                        if (s = strchr(pp.firstop->value, '='))
                            sfprintf(sp, "#%s %-.*s %s\n", dirname(DEFINE), s - pp.firstop->value, pp.firstop->value, s + 1);
                        else
                            sfprintf(sp, "#%s %s 1\n", dirname(DEFINE), pp.firstop->value);
                    }
                    break;
                case PP_DIRECTIVE:
                    sfprintf(sp, "#%s\n", pp.firstop->value);
                    break;
                case PP_OPTION:
                    if (s = strchr(pp.firstop->value, '='))
                        sfprintf(sp, "#%s %s:%-.*s %s\n", dirname(PRAGMA), pp.pass, s - pp.firstop->value, pp.firstop->value, s + 1);
                    else
                        sfprintf(sp, "#%s %s:%s\n", dirname(PRAGMA), pp.pass, pp.firstop->value);
                    break;
                case PP_READ:
                    sfprintf(sp, "#%s \"%s\"\n", dirname(INCLUDE), pp.firstop->value);
                    break;
                case PP_UNDEF:
                    sfprintf(sp, "#%s %s\n", dirname(UNDEF), pp.firstop->value);
                    break;
                }
                pp.lastop = pp.firstop;
                pp.firstop = pp.firstop->next;
                free(pp.lastop);
            }
            sfprintf(sp,
"\
#%s %s:%s\n\
#%s %s:%s\n\
#%s !#%s(%s)\n\
#%s !#%s(%s) || #%s(%s)\n\
"
                , dirname(PRAGMA)
                , pp.pass
                , keyname(X_BUILTIN)
                , dirname(PRAGMA)
                , pp.pass
                , keyname(X_PREDEFINED)
                , dirname(IF)
                , keyname(X_OPTION)
                , keyname(X_PLUSPLUS)
                , dirname(IF)
                , keyname(X_OPTION)
                , keyname(X_COMPATIBILITY)
                , keyname(X_OPTION)
                , keyname(X_TRANSITION)
                );
            sfprintf(sp,
"\
#%s #%s(%s)\n\
#%s %s:%s\n\
#%s %s:%s\n\
#%s __STRICT__ 1\n\
#%s\n\
#%s\n\
"
                , dirname(IF)
                , keyname(X_OPTION)
                , keyname(X_STRICT)
                , dirname(PRAGMA)
                , pp.pass
                , keyname(X_ALLMULTIPLE)
                , dirname(PRAGMA)
                , pp.pass
                , keyname(X_READONLY)
                , dirname(DEFINE)
                , dirname(ENDIF)
                , dirname(ENDIF)
                );
            for (kp = readonlys; s = kp->name; kp++)
            {
                if (!ppisid(*s))
                    s++;
                sfprintf(sp, "#%s %s\n", dirname(UNDEF), s);
            }
            sfprintf(sp,
"\
#%s\n\
#%s __STDPP__ 1\n\
#%s %s:no%s\n\
"
                , dirname(ENDIF)
                , dirname(DEFINE)
                , dirname(PRAGMA)
                , pp.pass
                , keyname(X_PREDEFINED)
                );
            if (!pp.truncate)
                sfprintf(sp,
"\
#%s __STDPP__directive #(%s)\n\
"
                , dirname(DEFINE)
                , keyname(V_DIRECTIVE)
                );
            for (kp = variables; s = kp->name; kp++)
                if (ppisid(*s) || *s++ == '+')
                {
                    t = *s == '_' ? "" : "__";
                    sfprintf(sp, "#%s %s%s%s #(%s)\n" , dirname(DEFINE), t, s, t, s);
                }
            sfprintf(sp,
"\
#%s %s:no%s\n\
#%s %s:no%s\n\
"
                , dirname(PRAGMA)
                , pp.pass
                , keyname(X_READONLY)
                , dirname(PRAGMA)
                , pp.pass
                , keyname(X_BUILTIN)
                );
            if (pp.ppdefault && *pp.ppdefault)
                sfprintf(sp, "#%s \"%s\"\n", dirname(INCLUDE), pp.ppdefault);
            sfprintf(sp,
"\
#%s !defined(__STDC__) && (!#option(compatibility) || #option(transition))\n\
#%s __STDC__ #(STDC)\n\
#%s\n\
"
                , dirname(IF)
                , dirname(DEFINE)
                , dirname(ENDIF)
                );
            t = sfstruse(sp);
            debug((-9, "\n/* begin initialization */\n%s/* end initialization */", t));
            ppcomment = pp.comment;
            pp.comment = 0;
            pplinesync = pp.linesync;
            pp.linesync = 0;
            PUSH_INIT(pp.pass, t);
            pp.mode |= INIT;
            while (pplex());
            pp.mode &= ~INIT;
            pp.comment = ppcomment;
            pp.linesync = pplinesync;
            pp.prefix = 0;
            sfstrclose(sp);
            if (error_info.trace)
                for (dp = pp.firstdir; dp; dp = dp->next)
                    message((-1, "include directory %s%s%s%s", dp->name, (dp->type & TYPE_VENDOR) ? " [VENDOR]" : "", (dp->type & TYPE_HOSTED) ? " [HOSTED]" : "", dp->c ? " [C]" : ""));
#if DEBUG
            }
            if (pp.test & TEST_nonoise)
                error_info.trace = c;
#endif
            {
                /*
                 * this is sleazy but at least it's
                 * hidden in the library
                 */
#include <preroot.h>
#if FS_PREROOT
                struct pplist*  preroot;

                if ((preroot = (struct pplist*)hashget(pp.prdtab, "preroot")))
                    setpreroot(NiL, preroot->value);
#endif
            }
            if (pp.ignoresrc)
            {
                if (pp.ignoresrc > 1 && pp.stddirs != pp.firstdir)
                    error(1, "directories up to and including %s are for \"...\" include files only", pp.stddirs->name);
                pp.lcldirs = pp.lcldirs->next;
            }
            if (pp.ignore)
            {
                if (*pp.ignore)
                    ppmapinclude(pp.ignore, NiL);
                else
                    pp.ignore = 0;
            }
            if (pp.standalone)
                pp.state |= STANDALONE;
#if COMPATIBLE
            ppfsm(FSM_COMPATIBILITY, NiL);
#endif
            ppfsm(FSM_PLUSPLUS, NiL);
            pp.initialized = 1;
            if (pp.reset.on)
            {
                pp.reset.symtab = pp.symtab;
                pp.symtab = 0;
                pp.reset.ro_state = pp.ro_state;
                pp.reset.ro_mode = pp.ro_mode;
                pp.reset.ro_option = pp.ro_option;
            }
        }
        if (pp.reset.on)
        {
            if (pp.symtab)
            {
                hashwalk(pp.filtab, 0, unguard, NiL);
                hashfree(pp.symtab);
            }
            pp.symtab = hashalloc(NiL, HASH_name, "symbols", HASH_free, undefine, HASH_set, HASH_ALLOCATE|HASH_BUCKET, 0);
            hashview(pp.symtab, pp.reset.symtab);
            pp.ro_state = pp.reset.ro_state;
            pp.ro_mode = pp.reset.ro_mode;
            pp.ro_option = pp.reset.ro_option;
        }
#if CHECKPOINT
        if (pp.mode & DUMP)
        {
            if (!pp.pragma)
                error(3, "#%s must be enabled for checkpoints", dirname(PRAGMA));
            (*pp.pragma)(dirname(PRAGMA), pp.pass, keyname(X_CHECKPOINT), pp.checkpoint, 1);
        }
#endif
        if (n = pp.filedeps.flags)
        {
            if (!(n & PP_deps_file))
            {
                pp.state |= NOTEXT;
                pp.option |= KEEPNOTEXT;
                pp.linesync = 0;
            }
            if (n & PP_deps_generated)
                pp.mode |= GENDEPS;
            if (n & PP_deps_local)
                pp.mode &= ~HEADERDEPS;
            else if (!(pp.mode & FILEDEPS))
                pp.mode |= HEADERDEPS;
            pp.mode |= FILEDEPS;
        }

        /*
         * push the main input file -- special case for hosted mark
         */

        if (pp.firstdir->type & TYPE_HOSTED)
            pp.mode |= MARKHOSTED;
        else
            pp.mode &= ~MARKHOSTED;
#if CHECKPOINT
        if (!(pp.mode & DUMP))
#endif
        {
            if (!(p = error_info.file))
                p = "";
            else
            {
                error_info.file = 0;
                if (*p)
                {
                    pathcanon(p, 0, 0);
                    p = ppsetfile(p)->name;
                }
            }
            PUSH_FILE(p, 0);
        }
        if (pp.mode & FILEDEPS)
        {
            if (s = strrchr(error_info.file, '/'))
                s++;
            else
                s = error_info.file;
            if (!*s)
                s = "-";
            s = strcpy(pp.tmpbuf, s);
            if ((t = p = strrchr(s, '.')) && (*++p == 'c' || *p == 'C'))
            {
                if (c = *++p)
                    while (*++p == c);
                if (*p)
                    t = 0;
                else
                    t++;
            }
            if (!t)
            {
                t = s + strlen(s);
                *t++ = '.';
            }
            *(t + 1) = 0;
            if (pp.state & NOTEXT)
                pp.filedeps.sp = sfstdout;
            else
            {
                *t = 'd';
                if (!(pp.filedeps.sp = sfopen(NiL, s, "w")))
                    error(ERROR_SYSTEM|3, "%s: cannot create", s);
            }
            *t = 'o';
            pp.column = sfprintf(pp.filedeps.sp, "%s :", s);
            if (*error_info.file)
                pp.column += sfprintf(pp.filedeps.sp, " %s", error_info.file);
        }
        if (xp = pp.firsttx)
        {
            if (!(sp = sfstropen()))
                error(3, "temporary buffer allocation error");
            while (xp)
            {
                sfprintf(sp, "#%s \"%s\"\n", dirname(INCLUDE), xp->value);
                xp = xp->next;
            }
            t = sfstruse(sp);
            PUSH_BUFFER("options", t, 1);
            sfstrclose(sp);
        }
        break;
    case PP_INPUT:
#if CHECKPOINT && POOL
        if (!(pp.mode & DUMP) || pp.pool.input)
#else
#if CHECKPOINT
        if (!(pp.mode & DUMP))
#else
#if POOL
        if (pp.pool.input)
#endif
#endif
#endif
        {
            p = va_arg(ap, char*);
            if (!error_info.file)
                error_info.file = p;
            close(0);
            if (open(p, O_RDONLY) != 0)
                error(ERROR_SYSTEM|3, "%s: cannot read", p);
            if (strmatch(p, "*.(s|S|as|AS|asm|ASM)"))
            {
                ppset(&pp.mode, CATLITERAL, 0);
                ppop(PP_SPACEOUT, 1);
            }
            break;
        }
        /*FALLTHROUGH*/
    case PP_TEXT:
        if (pp.initialized)
            goto before;
        if ((p = va_arg(ap, char*)) && *p)
        {
            if (pp.lasttx)
                pp.lasttx = pp.lasttx->next = newof(0, struct oplist, 1, 0);
            else
                pp.firsttx = pp.lasttx = newof(0, struct oplist, 1, 0);
            pp.lasttx->op = op;
            pp.lasttx->value = p;
        }
        break;
    case PP_KEYARGS:
        if (pp.initialized)
            goto before;
        ppset(&pp.option, KEYARGS, va_arg(ap, int));
        if (pp.option & KEYARGS)
#if MACKEYARGS
            ppset(&pp.mode, CATLITERAL, 1);
#else
            error(3, "preprocessor not compiled with macro keyword arguments enabled [MACKEYARGS]");
#endif
        break;
    case PP_LINE:
        if (ppok(op))
            pp.linesync = va_arg(ap, PPLINESYNC);
        break;
    case PP_LINEBASE:
        if (ppok(op))
        {
            if (va_arg(ap, int))
                pp.flags |= PP_linebase;
            else
                pp.flags &= ~PP_linebase;
        }
        break;
    case PP_LINEFILE:
        if (ppok(op))
        {
            if (va_arg(ap, int))
                pp.flags |= PP_linefile;
            else
                pp.flags &= ~PP_linefile;
        }
        break;
    case PP_LINEID:
        if (ppok(op))
        {
            if (!(p = va_arg(ap, char*)))
                pp.lineid = "";
            else if (*p != '-')
                pp.lineid = strdup(p);
            else
                pp.option |= IGNORELINE;
        }
        break;
    case PP_LINETYPE:
        if (ppok(op))
        {
            if ((n = va_arg(ap, int)) >= 1)
                pp.flags |= PP_linetype;
            else
                pp.flags &= ~PP_linetype;
            if (n >= 2)
                pp.flags |= PP_linehosted;
            else
                pp.flags &= ~PP_linehosted;
        }
        break;
    case PP_LOCAL:
        if (pp.initialized)
            goto before;
        pp.ignoresrc++;
        pp.stddirs = pp.lastdir;
        if (!(pp.ro_option & PREFIX))
            pp.option &= ~PREFIX;
        break;
    case PP_MACREF:
        pp.macref = va_arg(ap, PPMACREF);
        break;
    case PP_MULTIPLE:
        ppset(&pp.mode, ALLMULTIPLE, va_arg(ap, int));
        break;
    case PP_NOHASH:
        ppset(&pp.option, NOHASH, va_arg(ap, int));
        break;
    case PP_NOISE:
        op = va_arg(ap, int);
        ppset(&pp.option, NOISE, op);
        ppset(&pp.option, NOISEFILTER, op < 0);
        break;
    case PP_OPTARG:
        pp.optarg = va_arg(ap, PPOPTARG);
        break;
    case PP_OUTPUT:
        pp.outfile = va_arg(ap, char*);
        if (identical(pp.outfile, 0))
            error(3, "%s: identical to input", pp.outfile);
        close(1);
        if (open(pp.outfile, O_WRONLY|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH) != 1)
            error(ERROR_SYSTEM|3, "%s: cannot create", pp.outfile);
        break;
    case PP_PASSTHROUGH:
        if (!(pp.state & COMPILE))
            ppset(&pp.state, PASSTHROUGH, va_arg(ap, int));
        break;
    case PP_PEDANTIC:
        ppset(&pp.mode, PEDANTIC, va_arg(ap, int));
        break;
    case PP_PLUSCOMMENT:
        if (ppset(&pp.option, PLUSCOMMENT, va_arg(ap, int)) && pp.initialized)
            ppfsm(FSM_PLUSPLUS, NiL);
        break;
    case PP_PLUSPLUS:
        if (ppset(&pp.option, PLUSPLUS, va_arg(ap, int)) && ppset(&pp.option, PLUSCOMMENT, va_arg(ap, int)) && pp.initialized)
            ppfsm(FSM_PLUSPLUS, NiL);
        break;
    case PP_POOL:
        if (pp.initialized)
            goto before;
        if (va_arg(ap, int))
        {
#if POOL
            pp.pool.input = dup(0);
            pp.pool.output = dup(1);
            p = "/dev/null";
            if (!identical(p, 0))
            {
                if (!identical(p, 1))
                    ppop(PP_OUTPUT, p);
                ppop(PP_INPUT, p);
            }
#else
            error(3, "preprocessor not compiled with input pool enabled [POOL]");
#endif
        }
        break;
    case PP_PRAGMA:
        pp.pragma = va_arg(ap, PPPRAGMA);
        break;
    case PP_PRAGMAFLAGS:
        if (p = va_arg(ap, char*))
        {
            n = OPT_GLOBAL;
            if (*p == '-')
                p++;
            else
                n |= OPT_PASS;
            if ((c = (int)hashref(pp.strtab, p)) > 0 && c <= X_last_option)
                pp.optflags[c] = n;
        }
        break;
    case PP_PROBE:
        pp.probe = va_arg(ap, char*);
        break;
    case PP_QUOTE:
        p = va_arg(ap, char*);
        c = va_arg(ap, int);
        if (p)
            ppfsm(c ? FSM_QUOTADD : FSM_QUOTDEL, p);
        break;
    case PP_REGUARD:
        ppset(&pp.option, REGUARD, va_arg(ap, int));
        break;
    case PP_RESERVED:
        if ((pp.state & COMPILE) && (p = va_arg(ap, char*)))
        {
            if (!(sp = sfstropen()))
                error(3, "temporary buffer allocation error");
            sfputr(sp, p, -1);
            p = sfstruse(sp);
            if (s = strchr(p, '='))
                *s++ = 0;
            else
                s = p;
            while (*s == '_')
                s++;
            for (t = s + strlen(s); t > s && *(t - 1) == '_'; t--);
            if (*t == '_')
                *t = 0;
            else
                t = 0;
            op = ((key = ppkeyref(pp.symtab, s)) && (key->sym.flags & SYM_LEX)) ? key->lex : T_NOISE;
            if (pp.test & 0x0400)
                error(1, "reserved#1 `%s' %d", s, op);
            if (t)
                *t = '_';
            if (!(key = ppkeyget(pp.symtab, p)))
                key = ppkeyset(pp.symtab, NiL);
            else if (!(key->sym.flags & SYM_LEX))
            {
                struct ppsymbol tmp;

                tmp = key->sym;
                hashlook(pp.symtab, p, HASH_DELETE, NiL);
                key = ppkeyset(pp.symtab, NiL);
                key->sym.flags = tmp.flags;
                key->sym.macro = tmp.macro;
                key->sym.value = tmp.value;
                key->sym.hidden = tmp.hidden;
            }
            if (!(key->sym.flags & SYM_KEYWORD))
            {
                key->sym.flags |= SYM_KEYWORD|SYM_LEX;
                key->lex = op;
                if (pp.test & 0x0400)
                    error(1, "reserved#2 `%s' %d", p, op);
            }
            sfstrclose(sp);
        }
        break;
    case PP_SPACEOUT:
        ppset(&pp.state, SPACEOUT, va_arg(ap, int));
        break;
    case PP_STANDALONE:
        if (pp.initialized)
            goto before;
        pp.standalone = 1;
        break;
    case PP_STANDARD:
        if ((pp.lastdir->next->name = ((p = va_arg(ap, char*)) && *p) ? p : NiL) && !stat(p, &st))
            SAVEID(&pp.lastdir->next->id, &st);
        for (dp = pp.firstdir; dp; dp = dp->next)
            if (dp->name)
                for (hp = pp.firstdir; hp != dp; hp = hp->next)
                    if (hp->name && SAMEID(&hp->id, &dp->id))
                    {
                        hp->c = dp->c;
                        if (dp->type & TYPE_HOSTED)
                            hp->type |= TYPE_HOSTED;
                        else
                            hp->type &= ~TYPE_HOSTED;
                    }
        break;
    case PP_STRICT:
        if (ppset(&pp.state, STRICT, va_arg(ap, int)))
        {
            if (ppset(&pp.state, TRANSITION, 0))
                pp.flags &= ~PP_transition;
            if (pp.state & STRICT)
                pp.flags |= PP_strict;
            else
                pp.flags &= ~PP_strict;
        }
        break;
    case PP_TEST:
        if (p = va_arg(ap, char*))
            for (;;)
            {
                while (*p == ' ' || *p == '\t') p++;
                for (s = p; n = *s; s++)
                    if (n == ',' || n == ' ' || n == '\t')
                    {
                        *s++ = 0;
                        break;
                    }
                if (!*p)
                    break;
                n = 0;
                if (*p == 'n' && *(p + 1) == 'o')
                {
                    p += 2;
                    op = 0;
                }
                else
                    op = 1;
                if (streq(p, "count"))
                    n = TEST_count;
                else if (streq(p, "hashcount"))
                    n = TEST_hashcount;
                else if (streq(p, "hashdump"))
                    n = TEST_hashdump;
                else if (streq(p, "hit"))
                    n = TEST_hit;
                else if (streq(p, "init"))
                    n = TEST_noinit|TEST_INVERT;
                else if (streq(p, "noise"))
                    n = TEST_nonoise|TEST_INVERT;
                else if (streq(p, "proto"))
                    n = TEST_noproto|TEST_INVERT;
                else if (*p >= '0' && *p <= '9')
                    n = strtoul(p, NiL, 0);
                else
                {
                    error(1, "%s: unknown test", p);
                    break;
                }
                if (n & TEST_INVERT)
                {
                    n &= ~TEST_INVERT;
                    op = !op;
                }
                if (op)
                    pp.test |= n;
                else
                    pp.test &= ~n;
                p = s;
                debug((-4, "test = 0%o", pp.test));
            }
        break;
    case PP_TRANSITION:
        if (ppset(&pp.state, TRANSITION, va_arg(ap, int)))
        {
            if (ppset(&pp.state, STRICT, 0))
                pp.flags &= ~PP_strict;
            if (pp.state & TRANSITION)
                pp.flags |= PP_transition;
            else
                pp.flags &= ~PP_transition;
        }
        break;
    case PP_TRUNCATE:
        if (pp.initialized)
            goto before;
        if ((op = va_arg(ap, int)) < 0)
            op = 0;
        ppset(&pp.option, TRUNCATE, op);
        if (pp.option & TRUNCATE)
        {
            Hash_bucket_t*      b;
            Hash_bucket_t*      p;
            Hash_position_t*    pos;
            Hash_table_t*       tab;

            pp.truncate = op;
            tab = pp.symtab;
            pp.symtab = hashalloc(NiL, HASH_set, tab ? HASH_ALLOCATE : 0, HASH_compare, trunccomp, HASH_hash, trunchash, HASH_name, "truncate", 0);
            if (tab && (pos = hashscan(tab, 0)))
            {
                if (p = hashnext(pos))
                    do
                    {
                        b = hashnext(pos);
                        hashlook(pp.symtab, (char*)p, HASH_BUCKET|HASH_INSTALL, NiL);
                    } while (p = b);
                hashdone(pos);
            }
        }
        else
            pp.truncate = 0;
        break;
    case PP_VENDOR:
        p = va_arg(ap, char*);
        c = va_arg(ap, int) != 0;
        if (!p || !*p)
            for (dp = pp.firstdir; dp; dp = dp->next)
                dp->type &= ~TYPE_VENDOR;
        else if (streq(p, "-"))
        {
            for (dp = pp.firstdir; dp; dp = dp->next)
                if (c)
                    dp->type |= TYPE_VENDOR;
                else
                    dp->type &= ~TYPE_VENDOR;
        }
        else if (!stat((pathcanon(p, 0, 0), p), &st))
        {
            c = 0;
            for (dp = pp.firstdir; dp; dp = dp->next)
            {
                if (!c && ((dp->type & TYPE_VENDOR) || dp->name && SAMEID(&dp->id, &st)))
                    c = 1;
                if (c)
                    dp->type |= TYPE_VENDOR;
                else
                    dp->type &= ~TYPE_VENDOR;
            }
        }
        break;
    case PP_WARN:
        ppset(&pp.state, WARN, va_arg(ap, int));
        break;
    before:
        error(3, "ppop(%d): preprocessor operation must be done before PP_INIT", op);
        break;
    default:
        error(3, "ppop(%d): invalid preprocessor operation", op);
        break;
    }
    va_end(ap);
}