stab.c

早期freebsd实现

/* $RCSfile: stab.c,v $$Revision: 4.0.1.5 $$Date: 1993/02/05 19:42:47 $
 *
 *    Copyright (c) 1991, Larry Wall
 *
 *    You may distribute under the terms of either the GNU General Public
 *    License or the Artistic License, as specified in the README file.
 *
 * $Log: stab.c,v $
 * Revision 4.0.1.5  1993/02/05  19:42:47  lwall
 * patch36: length returned wrong value on certain semi-magical variables
 *
 * Revision 4.0.1.4  92/06/08  15:32:19  lwall
 * patch20: fixed confusion between a *var's real name and its effective name
 * patch20: the debugger now warns you on lines that can't set a breakpoint
 * patch20: the debugger made perl forget the last pattern used by //
 * patch20: paragraph mode now skips extra newlines automatically
 * patch20: ($<,$>) = ... didn't work on some architectures
 * 
 * Revision 4.0.1.3  91/11/05  18:35:33  lwall
 * patch11: length($x) was sometimes wrong for numeric $x
 * patch11: perl now issues warning if $SIG{'ALARM'} is referenced
 * patch11: *foo = undef coredumped
 * patch11: solitary subroutine references no longer trigger typo warnings
 * patch11: local(*FILEHANDLE) had a memory leak
 * 
 * Revision 4.0.1.2  91/06/07  11:55:53  lwall
 * patch4: new copyright notice
 * patch4: added $^P variable to control calling of perldb routines
 * patch4: added $^F variable to specify maximum system fd, default 2
 * patch4: $` was busted inside s///
 * patch4: default top-of-form format is now FILEHANDLE_TOP
 * patch4: length($`), length($&), length($') now optimized to avoid string copy
 * patch4: $^D |= 1024 now does syntax tree dump at run-time
 * 
 * Revision 4.0.1.1  91/04/12  09:10:24  lwall
 * patch1: Configure now differentiates getgroups() type from getgid() type
 * patch1: you may now use "die" and "caller" in a signal handler
 * 
 * Revision 4.0  91/03/20  01:39:41  lwall
 * 4.0 baseline.
 * 
 */

#include "EXTERN.h"
#include "perl.h"

#if !defined(NSIG) || defined(M_UNIX) || defined(M_XENIX)
#include <signal.h>
#endif

static char *sig_name[] = {
    SIG_NAME,0
};

#ifdef VOIDSIG
#define handlertype void
#else
#define handlertype int
#endif

static handlertype sighandler();

static int origalen = 0;

STR *
stab_str(str)
STR *str;
{
    STAB *stab = str->str_u.str_stab;
    register int paren;
    register char *s;
    register int i;

    if (str->str_rare)
	return stab_val(stab);

    switch (*stab->str_magic->str_ptr) {
    case '\004':		/* ^D */
#ifdef DEBUGGING
	str_numset(stab_val(stab),(double)(debug & 32767));
#endif
	break;
    case '\006':		/* ^F */
	str_numset(stab_val(stab),(double)maxsysfd);
	break;
    case '\t':			/* ^I */
	if (inplace)
	    str_set(stab_val(stab), inplace);
	else
	    str_sset(stab_val(stab),&str_undef);
	break;
    case '\020':		/* ^P */
	str_numset(stab_val(stab),(double)perldb);
	break;
    case '\024':		/* ^T */
	str_numset(stab_val(stab),(double)basetime);
	break;
    case '\027':		/* ^W */
	str_numset(stab_val(stab),(double)dowarn);
	break;
    case '1': case '2': case '3': case '4':
    case '5': case '6': case '7': case '8': case '9': case '&':
	if (curspat) {
	    paren = atoi(stab_ename(stab));
	  getparen:
	    if (curspat->spat_regexp &&
	      paren <= curspat->spat_regexp->nparens &&
	      (s = curspat->spat_regexp->startp[paren]) ) {
		i = curspat->spat_regexp->endp[paren] - s;
		if (i >= 0)
		    str_nset(stab_val(stab),s,i);
		else
		    str_sset(stab_val(stab),&str_undef);
	    }
	    else
		str_sset(stab_val(stab),&str_undef);
	}
	break;
    case '+':
	if (curspat) {
	    paren = curspat->spat_regexp->lastparen;
	    goto getparen;
	}
	break;
    case '`':
	if (curspat) {
	    if (curspat->spat_regexp &&
	      (s = curspat->spat_regexp->subbeg) ) {
		i = curspat->spat_regexp->startp[0] - s;
		if (i >= 0)
		    str_nset(stab_val(stab),s,i);
		else
		    str_nset(stab_val(stab),"",0);
	    }
	    else
		str_nset(stab_val(stab),"",0);
	}
	break;
    case '\'':
	if (curspat) {
	    if (curspat->spat_regexp &&
	      (s = curspat->spat_regexp->endp[0]) ) {
		str_nset(stab_val(stab),s, curspat->spat_regexp->subend - s);
	    }
	    else
		str_nset(stab_val(stab),"",0);
	}
	break;
    case '.':
#ifndef lint
	if (last_in_stab && stab_io(last_in_stab)) {
	    str_numset(stab_val(stab),(double)stab_io(last_in_stab)->lines);
	}
#endif
	break;
    case '?':
	str_numset(stab_val(stab),(double)statusvalue);
	break;
    case '^':
	s = stab_io(curoutstab)->top_name;
	if (s)
	    str_set(stab_val(stab),s);
	else {
	    str_set(stab_val(stab),stab_ename(curoutstab));
	    str_cat(stab_val(stab),"_TOP");
	}
	break;
    case '~':
	s = stab_io(curoutstab)->fmt_name;
	if (!s)
	    s = stab_ename(curoutstab);
	str_set(stab_val(stab),s);
	break;
#ifndef lint
    case '=':
	str_numset(stab_val(stab),(double)stab_io(curoutstab)->page_len);
	break;
    case '-':
	str_numset(stab_val(stab),(double)stab_io(curoutstab)->lines_left);
	break;
    case '%':
	str_numset(stab_val(stab),(double)stab_io(curoutstab)->page);
	break;
#endif
    case ':':
	break;
    case '/':
	break;
    case '[':
	str_numset(stab_val(stab),(double)arybase);
	break;
    case '|':
	if (!stab_io(curoutstab))
	    stab_io(curoutstab) = stio_new();
	str_numset(stab_val(stab),
	   (double)((stab_io(curoutstab)->flags & IOF_FLUSH) != 0) );
	break;
    case ',':
	str_nset(stab_val(stab),ofs,ofslen);
	break;
    case '\\':
	str_nset(stab_val(stab),ors,orslen);
	break;
    case '#':
	str_set(stab_val(stab),ofmt);
	break;
    case '!':
	str_numset(stab_val(stab), (double)errno);
	str_set(stab_val(stab), errno ? strerror(errno) : "");
	stab_val(stab)->str_nok = 1;	/* what a wonderful hack! */
	break;
    case '<':
	str_numset(stab_val(stab),(double)uid);
	break;
    case '>':
	str_numset(stab_val(stab),(double)euid);
	break;
    case '(':
	s = buf;
	(void)sprintf(s,"%d",(int)gid);
	goto add_groups;
    case ')':
	s = buf;
	(void)sprintf(s,"%d",(int)egid);
      add_groups:
	while (*s) s++;
#ifdef HAS_GETGROUPS
#ifndef NGROUPS
#define NGROUPS 32
#endif
	{
	    GROUPSTYPE gary[NGROUPS];

	    i = getgroups(NGROUPS,gary);
	    while (--i >= 0) {
		(void)sprintf(s," %ld", (long)gary[i]);
		while (*s) s++;
	    }
	}
#endif
	str_set(stab_val(stab),buf);
	break;
    case '*':
	break;
    case '0':
	break;
    default:
	{
	    struct ufuncs *uf = (struct ufuncs *)str->str_ptr;

	    if (uf && uf->uf_val)
		(*uf->uf_val)(uf->uf_index, stab_val(stab));
	}
	break;
    }
    return stab_val(stab);
}

STRLEN
stab_len(str)
STR *str;
{
    STAB *stab = str->str_u.str_stab;
    int paren;
    int i;
    char *s;

    if (str->str_rare)
	return str_len(stab_val(stab));

    switch (*stab->str_magic->str_ptr) {
    case '1': case '2': case '3': case '4':
    case '5': case '6': case '7': case '8': case '9': case '&':
	if (curspat) {
	    paren = atoi(stab_ename(stab));
	  getparen:
	    if (curspat->spat_regexp &&
	      paren <= curspat->spat_regexp->nparens &&
	      (s = curspat->spat_regexp->startp[paren]) ) {
		i = curspat->spat_regexp->endp[paren] - s;
		if (i >= 0)
		    return i;
		else
		    return 0;
	    }
	    else
		return 0;
	}
	break;
    case '+':
	if (curspat) {
	    paren = curspat->spat_regexp->lastparen;
	    goto getparen;
	}
	break;
    case '`':
	if (curspat) {
	    if (curspat->spat_regexp &&
	      (s = curspat->spat_regexp->subbeg) ) {
		i = curspat->spat_regexp->startp[0] - s;
		if (i >= 0)
		    return i;
		else
		    return 0;
	    }
	    else
		return 0;
	}
	break;
    case '\'':
	if (curspat) {
	    if (curspat->spat_regexp &&
	      (s = curspat->spat_regexp->endp[0]) ) {
		return (STRLEN) (curspat->spat_regexp->subend - s);
	    }
	    else
		return 0;
	}
	break;
    case ',':
	return (STRLEN)ofslen;
    case '\\':
	return (STRLEN)orslen;
    }
    return str_len(stab_str(str));
}

void
stabset(mstr,str)
register STR *mstr;
STR *str;
{
    STAB *stab;
    register char *s;
    int i;

    switch (mstr->str_rare) {
    case 'E':
	my_setenv(mstr->str_ptr,str_get(str));
				/* And you'll never guess what the dog had */
				/*   in its mouth... */
#ifdef TAINT
	if (strEQ(mstr->str_ptr,"PATH")) {
	    char *strend = str->str_ptr + str->str_cur;

	    s = str->str_ptr;
	    while (s < strend) {
		s = cpytill(tokenbuf,s,strend,':',&i);
		s++;
		if (*tokenbuf != '/'
		  || (stat(tokenbuf,&statbuf) && (statbuf.st_mode & 2)) )
		    str->str_tainted = 2;
	    }
	}
#endif
	break;
    case 'S':
	s = str_get(str);
	i = whichsig(mstr->str_ptr);	/* ...no, a brick */
	if (!i && (dowarn || strEQ(mstr->str_ptr,"ALARM")))
	    warn("No such signal: SIG%s", mstr->str_ptr);
	if (strEQ(s,"IGNORE"))
#ifndef lint
	    (void)signal(i,SIG_IGN);
#else
	    ;
#endif
	else if (strEQ(s,"DEFAULT") || !*s)
	    (void)signal(i,SIG_DFL);
	else {
	    (void)signal(i,sighandler);
	    if (!index(s,'\'')) {
		sprintf(tokenbuf, "main'%s",s);
		str_set(str,tokenbuf);
	    }
	}
	break;
#ifdef SOME_DBM
    case 'D':
	stab = mstr->str_u.str_stab;
	hdbmstore(stab_hash(stab),mstr->str_ptr,mstr->str_cur,str);
	break;
#endif
    case 'L':
	{
	    CMD *cmd;

	    stab = mstr->str_u.str_stab;
	    i = str_true(str);
	    str = afetch(stab_xarray(stab),atoi(mstr->str_ptr), FALSE);
	    if (str->str_magic && (cmd = str->str_magic->str_u.str_cmd)) {
		cmd->c_flags &= ~CF_OPTIMIZE;
		cmd->c_flags |= i? CFT_D1 : CFT_D0;
	    }
	    else
		warn("Can't break at that line\n");
	}
	break;
    case '#':
	stab = mstr->str_u.str_stab;
	afill(stab_array(stab), (int)str_gnum(str) - arybase);
	break;
    case 'X':	/* merely a copy of a * string */
	break;
    case '*':
	s = str->str_pok ? str_get(str) : "";
	if (strNE(s,"StB") || str->str_cur != sizeof(STBP)) {
	    stab = mstr->str_u.str_stab;
	    if (!*s) {
		STBP *stbp;

		/*SUPPRESS 701*/
		(void)savenostab(stab);	/* schedule a free of this stab */
		if (stab->str_len)
		    Safefree(stab->str_ptr);
		Newz(601,stbp, 1, STBP);
		stab->str_ptr = stbp;
		stab->str_len = stab->str_cur = sizeof(STBP);
		stab->str_pok = 1;
		strcpy(stab_magic(stab),"StB");
		stab_val(stab) = Str_new(70,0);
		stab_line(stab) = curcmd->c_line;
		stab_estab(stab) = stab;
	    }
	    else {
		stab = stabent(s,TRUE);
		if (!stab_xarray(stab))
		    aadd(stab);
		if (!stab_xhash(stab))
		    hadd(stab);
		if (!stab_io(stab))
		    stab_io(stab) = stio_new();
	    }
	    str_sset(str, (STR*) stab);
	}
	break;
    case 's': {
	    struct lstring *lstr = (struct lstring*)str;
	    char *tmps;

	    mstr->str_rare = 0;
	    str->str_magic = Nullstr;
	    tmps = str_get(str);
	    str_insert(mstr,lstr->lstr_offset,lstr->lstr_len,
	      tmps,str->str_cur);
	}
	break;

    case 'v':
	do_vecset(mstr,str);
	break;

    case 0:
	/*SUPPRESS 560*/
	if (!(stab = mstr->str_u.str_stab))
	    break;
	switch (*stab->str_magic->str_ptr) {
	case '\004':	/* ^D */
#ifdef DEBUGGING
	    debug = (int)(str_gnum(str)) | 32768;
	    if (debug & 1024)
		dump_all();
#endif
	    break;
	case '\006':	/* ^F */
	    maxsysfd = (int)str_gnum(str);
	    break;
	case '\t':	/* ^I */
	    if (inplace)
		Safefree(inplace);
	    if (str->str_pok || str->str_nok)
		inplace = savestr(str_get(str));
	    else
		inplace = Nullch;
	    break;
	case '\020':	/* ^P */
	    i = (int)str_gnum(str);
	    if (i != perldb) {
		static SPAT *oldlastspat;

		if (perldb)
		    oldlastspat = lastspat;
		else
		    lastspat = oldlastspat;
	    }
	    perldb = i;
	    break;
	case '\024':	/* ^T */
	    basetime = (time_t)str_gnum(str);
	    break;
	case '\027':	/* ^W */
	    dowarn = (bool)str_gnum(str);
	    break;
	case '.':
	    if (localizing)
		savesptr((STR**)&last_in_stab);
	    break;
	case '^':
	    Safefree(stab_io(curoutstab)->top_name);
	    stab_io(curoutstab)->top_name = s = savestr(str_get(str));
	    stab_io(curoutstab)->top_stab = stabent(s,TRUE);
	    break;
	case '~':
	    Safefree(stab_io(curoutstab)->fmt_name);
	    stab_io(curoutstab)->fmt_name = s = savestr(str_get(str));
	    stab_io(curoutstab)->fmt_stab = stabent(s,TRUE);
	    break;
	case '=':
	    stab_io(curoutstab)->page_len = (long)str_gnum(str);
	    break;
	case '-':
	    stab_io(curoutstab)->lines_left = (long)str_gnum(str);
	    if (stab_io(curoutstab)->lines_left < 0L)
		stab_io(curoutstab)->lines_left = 0L;
	    break;
	case '%':
	    stab_io(curoutstab)->page = (long)str_gnum(str);
	    break;
	case '|':
	    if (!stab_io(curoutstab))
		stab_io(curoutstab) = stio_new();
	    stab_io(curoutstab)->flags &= ~IOF_FLUSH;
	    if (str_gnum(str) != 0.0) {
		stab_io(curoutstab)->flags |= IOF_FLUSH;
	    }
	    break;
	case '*':