1 /* stolen_chunk_of_toke.c - from perl 5.8.8 toke.c
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * "It all comes from here, the stench and the peril." --Frodo
16 * this is all blatantly stolen. I sincerely hopes it doesn't fuck anything
17 * up but if it does blame me (Matt S Trout), not the poor original authors
20 /* the following #defines are stolen from assorted headers, not toke.c (mst) */
22 #define DPTR2FPTR(t,p) ((t)PTR2nat(p)) /* data pointer to function pointer */
23 #define FPTR2DPTR(t,p) ((t)PTR2nat(p)) /* function pointer to data pointer */
24 #define PTR2nat(p) (PTRV)(p) /* pointer to integer of PTRSIZE */
25 #define MEM_WRAP_CHECK_(n,t) MEM_WRAP_CHECK(n,t),
27 /* conditionalise these two because as of 5.9.5 we already get them from
30 #define Newx(v,n,t) (v = (MEM_WRAP_CHECK_(n,t) (t*)safemalloc((MEM_SIZE)((n)*sizeof(t)))))
33 #define SvPVX_const(sv) ((const char*) (0 + SvPVX(sv)))
36 #define SvPV_renew(sv,n) \
37 STMT_START { SvLEN_set(sv, n); \
38 SvPV_set((sv), (MEM_WRAP_CHECK_(n,char) \
39 (char*)saferealloc((Malloc_t)SvPVX(sv), \
43 /* On MacOS, respect nonbreaking spaces */
44 #ifdef MACOS_TRADITIONAL
45 #define SPACE_OR_TAB(c) ((c)==' '||(c)=='\312'||(c)=='\t')
47 #define SPACE_OR_TAB(c) ((c)==' '||(c)=='\t')
50 #define CLINE (PL_copline = (CopLINE(PL_curcop) < PL_copline ? CopLINE(PL_curcop) : PL_copline))
52 #define LEX_NORMAL 10 /* normal code (ie not within "...") */
53 #define LEX_INTERPNORMAL 9 /* code within a string, eg "$foo[$x+1]" */
54 #define LEX_INTERPCASEMOD 8 /* expecting a \U, \Q or \E etc */
55 #define LEX_INTERPPUSH 7 /* starting a new sublex parse level */
56 #define LEX_INTERPSTART 6 /* expecting the start of a $var */
58 /* at end of code, eg "$x" followed by: */
59 #define LEX_INTERPEND 5 /* ... eg not one of [, { or -> */
60 #define LEX_INTERPENDMAYBE 4 /* ... eg one of [, { or -> */
62 #define LEX_INTERPCONCAT 3 /* expecting anything, eg at start of
63 string or after \E, $foo, etc */
64 #define LEX_INTERPCONST 2 /* NOT USED */
65 #define LEX_FORMLINE 1 /* expecting a format line */
66 #define LEX_KNOWNEXT 0 /* next token known; just return it */
68 /* and these two are my own madness (mst) */
70 #if PERL_REVISION == 5 && PERL_VERSION == 8 && PERL_SUBVERSION >= 8
71 #define PERL_5_8_8_PLUS
74 #if PERL_REVISION == 5 && PERL_VERSION > 8
79 /* 5.9+ moves a bunch of things to a PL_parser struct so we need to
80 declare the backcompat macros for things to still work (mst) */
82 /* XXX temporary backwards compatibility */
83 #define PL_lex_brackets (PL_parser->lex_brackets)
84 #define PL_lex_brackstack (PL_parser->lex_brackstack)
85 #define PL_lex_casemods (PL_parser->lex_casemods)
86 #define PL_lex_casestack (PL_parser->lex_casestack)
87 #define PL_lex_defer (PL_parser->lex_defer)
88 #define PL_lex_dojoin (PL_parser->lex_dojoin)
89 #define PL_lex_expect (PL_parser->lex_expect)
90 #define PL_lex_formbrack (PL_parser->lex_formbrack)
91 #define PL_lex_inpat (PL_parser->lex_inpat)
92 #define PL_lex_inwhat (PL_parser->lex_inwhat)
93 #define PL_lex_op (PL_parser->lex_op)
94 #define PL_lex_repl (PL_parser->lex_repl)
95 #define PL_lex_starts (PL_parser->lex_starts)
96 #define PL_lex_stuff (PL_parser->lex_stuff)
97 #define PL_multi_start (PL_parser->multi_start)
98 #define PL_multi_open (PL_parser->multi_open)
99 #define PL_multi_close (PL_parser->multi_close)
100 #define PL_pending_ident (PL_parser->pending_ident)
101 #define PL_preambled (PL_parser->preambled)
102 #define PL_sublex_info (PL_parser->sublex_info)
103 #define PL_linestr (PL_parser->linestr)
104 #define PL_sublex_info (PL_parser->sublex_info)
105 #define PL_linestr (PL_parser->linestr)
106 #define PL_expect (PL_parser->expect)
107 #define PL_copline (PL_parser->copline)
108 #define PL_bufptr (PL_parser->bufptr)
109 #define PL_oldbufptr (PL_parser->oldbufptr)
110 #define PL_oldoldbufptr (PL_parser->oldoldbufptr)
111 #define PL_linestart (PL_parser->linestart)
112 #define PL_bufend (PL_parser->bufend)
113 #define PL_last_uni (PL_parser->last_uni)
114 #define PL_last_lop (PL_parser->last_lop)
115 #define PL_last_lop_op (PL_parser->last_lop_op)
116 #define PL_lex_state (PL_parser->lex_state)
117 #define PL_rsfp (PL_parser->rsfp)
118 #define PL_rsfp_filters (PL_parser->rsfp_filters)
119 #define PL_in_my (PL_parser->in_my)
120 #define PL_in_my_stash (PL_parser->in_my_stash)
121 #define PL_tokenbuf (PL_parser->tokenbuf)
122 #define PL_multi_end (PL_parser->multi_end)
123 #define PL_error_count (PL_parser->error_count)
124 /* these three are from the non-PERL_MAD path but I don't -think- I need
125 the PERL_MAD stuff since my code isn't really populating things (mst) */
126 # define PL_nexttoke (PL_parser->nexttoke)
127 # define PL_nexttype (PL_parser->nexttype)
128 # define PL_nextval (PL_parser->nextval)
129 /* end of backcompat macros form 5.9 toke.c (mst) */
130 /* we also need this because we define PERL_CORE so handy.h doesn't provide
132 #define NEWSV(x,len) newSV(len)
135 /* when ccflags include -DDEBUGGING we need this for earlier 5.8 perls */
136 #ifndef SvPV_nolen_const
137 #define SvPV_nolen_const SvPV_nolen
140 /* and now we're back to the toke.c stuff again (mst) */
142 static const char ident_too_long[] =
143 "Identifier too long";
144 static const char c_without_g[] =
145 "Use of /c modifier is meaningless without /g";
146 static const char c_in_subst[] =
147 "Use of /c modifier is meaningless in s///";
149 #ifdef USE_UTF8_SCRIPTS
150 # define UTF (!IN_BYTES)
152 # define UTF ((PL_linestr && DO_UTF8(PL_linestr)) || (PL_hints & HINT_UTF8))
155 /* Invoke the idxth filter function for the current rsfp. */
156 /* maxlen 0 = read one text line */
158 Perl_filter_read(pTHX_ int idx, SV *buf_sv, int maxlen)
163 if (!PL_rsfp_filters)
165 if (idx > AvFILLp(PL_rsfp_filters)) { /* Any more filters? */
166 /* Provide a default input filter to make life easy. */
167 /* Note that we append to the line. This is handy. */
168 DEBUG_P(PerlIO_printf(Perl_debug_log,
169 "filter_read %d: from rsfp\n", idx));
173 const int old_len = SvCUR(buf_sv);
175 /* ensure buf_sv is large enough */
176 SvGROW(buf_sv, (STRLEN)(old_len + maxlen)) ;
177 if ((len = PerlIO_read(PL_rsfp, SvPVX(buf_sv) + old_len, maxlen)) <= 0){
178 if (PerlIO_error(PL_rsfp))
179 return -1; /* error */
181 return 0 ; /* end of file */
183 SvCUR_set(buf_sv, old_len + len) ;
186 if (sv_gets(buf_sv, PL_rsfp, SvCUR(buf_sv)) == NULL) {
187 if (PerlIO_error(PL_rsfp))
188 return -1; /* error */
190 return 0 ; /* end of file */
193 return SvCUR(buf_sv);
195 /* Skip this filter slot if filter has been deleted */
196 if ( (datasv = FILTER_DATA(idx)) == &PL_sv_undef) {
197 DEBUG_P(PerlIO_printf(Perl_debug_log,
198 "filter_read %d: skipped (filter deleted)\n",
200 return FILTER_READ(idx+1, buf_sv, maxlen); /* recurse */
202 /* Get function pointer hidden within datasv */
203 funcp = DPTR2FPTR(filter_t, IoANY(datasv));
204 DEBUG_P(PerlIO_printf(Perl_debug_log,
205 "filter_read %d: via function %p (%s)\n",
206 idx, datasv, SvPV_nolen_const(datasv)));
207 /* Call function. The function is expected to */
208 /* call "FILTER_READ(idx+1, buf_sv)" first. */
209 /* Return: <0:error, =0:eof, >0:not eof */
210 return (*funcp)(aTHX_ idx, buf_sv, maxlen);
214 S_filter_gets(pTHX_ register SV *sv, register PerlIO *fp, STRLEN append)
216 #ifdef PERL_CR_FILTER
217 if (!PL_rsfp_filters) {
218 filter_add(S_cr_textfilter,NULL);
221 if (PL_rsfp_filters) {
223 SvCUR_set(sv, 0); /* start with empty line */
224 if (FILTER_READ(0, sv, 0) > 0)
225 return ( SvPVX(sv) ) ;
230 return (sv_gets(sv, fp, append));
235 * Called to gobble the appropriate amount and type of whitespace.
236 * Skips comments as well.
240 S_skipspace(pTHX_ register char *s)
242 if (PL_lex_formbrack && PL_lex_brackets <= PL_lex_formbrack) {
243 while (s < PL_bufend && SPACE_OR_TAB(*s))
249 SSize_t oldprevlen, oldoldprevlen;
250 SSize_t oldloplen = 0, oldunilen = 0;
251 while (s < PL_bufend && isSPACE(*s)) {
252 if (*s++ == '\n' && PL_in_eval && !PL_rsfp)
257 if (s < PL_bufend && *s == '#') {
258 while (s < PL_bufend && *s != '\n')
262 if (PL_in_eval && !PL_rsfp) {
269 /* only continue to recharge the buffer if we're at the end
270 * of the buffer, we're not reading from a source filter, and
271 * we're in normal lexing mode
273 if (s < PL_bufend || !PL_rsfp || PL_sublex_info.sub_inwhat ||
274 PL_lex_state == LEX_FORMLINE)
277 /* try to recharge the buffer */
278 if ((s = filter_gets(PL_linestr, PL_rsfp,
279 (prevlen = SvCUR(PL_linestr)))) == Nullch)
281 /* end of file. Add on the -p or -n magic */
284 ";}continue{print or die qq(-p destination: $!\\n);}");
285 PL_minus_n = PL_minus_p = 0;
287 else if (PL_minus_n) {
288 sv_setpvn(PL_linestr, ";}", 2);
292 sv_setpvn(PL_linestr,";", 1);
294 /* reset variables for next time we lex */
295 PL_oldoldbufptr = PL_oldbufptr = PL_bufptr = s = PL_linestart
297 PL_bufend = SvPVX(PL_linestr) + SvCUR(PL_linestr);
298 PL_last_lop = PL_last_uni = Nullch;
300 /* Close the filehandle. Could be from -P preprocessor,
301 * STDIN, or a regular file. If we were reading code from
302 * STDIN (because the commandline held no -e or filename)
303 * then we don't close it, we reset it so the code can
304 * read from STDIN too.
307 if (PL_preprocess && !PL_in_eval)
308 (void)PerlProc_pclose(PL_rsfp);
309 else if ((PerlIO*)PL_rsfp == PerlIO_stdin())
310 PerlIO_clearerr(PL_rsfp);
312 (void)PerlIO_close(PL_rsfp);
317 /* not at end of file, so we only read another line */
318 /* make corresponding updates to old pointers, for yyerror() */
319 oldprevlen = PL_oldbufptr - PL_bufend;
320 oldoldprevlen = PL_oldoldbufptr - PL_bufend;
322 oldunilen = PL_last_uni - PL_bufend;
324 oldloplen = PL_last_lop - PL_bufend;
325 PL_linestart = PL_bufptr = s + prevlen;
326 PL_bufend = s + SvCUR(PL_linestr);
328 PL_oldbufptr = s + oldprevlen;
329 PL_oldoldbufptr = s + oldoldprevlen;
331 PL_last_uni = s + oldunilen;
333 PL_last_lop = s + oldloplen;
336 /* debugger active and we're not compiling the debugger code,
337 * so store the line into the debugger's array of lines
339 if (PERLDB_LINE && PL_curstash != PL_debstash) {
340 SV * const sv = NEWSV(85,0);
342 sv_upgrade(sv, SVt_PVMG);
343 sv_setpvn(sv,PL_bufptr,PL_bufend-PL_bufptr);
346 av_store(CopFILEAV(PL_curcop),(I32)CopLINE(PL_curcop),sv);
352 S_scan_word(pTHX_ register char *s, char *dest, STRLEN destlen, int allow_package, STRLEN *slp)
354 register char *d = dest;
355 register char * const e = d + destlen - 3; /* two-character token, ending NUL */
358 Perl_croak(aTHX_ ident_too_long);
359 if (isALNUM(*s)) /* UTF handled below */
361 else if (*s == '\'' && allow_package && isIDFIRST_lazy_if(s+1,UTF)) {
366 else if (*s == ':' && s[1] == ':' && allow_package && s[2] != '$') {
370 else if (UTF && UTF8_IS_START(*s) && isALNUM_utf8((U8*)s)) {
371 char *t = s + UTF8SKIP(s);
372 while (UTF8_IS_CONTINUED(*t) && is_utf8_mark((U8*)t))
375 Perl_croak(aTHX_ ident_too_long);
376 Copy(s, d, t - s, char);
390 * This subroutine has nothing to do with tilting, whether at windmills
391 * or pinball tables. Its name is short for "increment line". It
392 * increments the current line number in CopLINE(PL_curcop) and checks
393 * to see whether the line starts with a comment of the form
394 * # line 500 "foo.pm"
395 * If so, it sets the current line number and file to the values in the comment.
398 /* 5.9+ make the char *s in S_incline const and declare it in proto.h so we
399 need to do the same to avoid a prototype mismatch (mst) */
401 #define S_INCLINE_CONST const
403 #define S_INCLINE_CONST
407 S_incline(pTHX_ S_INCLINE_CONST char *s)
410 S_INCLINE_CONST char *n;
411 S_INCLINE_CONST char *e;
414 CopLINE_inc(PL_curcop);
417 while (SPACE_OR_TAB(*s)) s++;
418 if (strnEQ(s, "line", 4))
422 if (SPACE_OR_TAB(*s))
426 while (SPACE_OR_TAB(*s)) s++;
432 while (SPACE_OR_TAB(*s))
434 if (*s == '"' && (t = strchr(s+1, '"'))) {
439 /* explicitly cast to char * in case S_INCLINE_CONST in force (mst) */
440 for (t = (char *)s; !isSPACE(*t); t++) ;
443 while (SPACE_OR_TAB(*e) || *e == '\r' || *e == '\f')
445 if (*e != '\n' && *e != '\0')
446 return; /* false alarm */
451 /* this chunk was added to S_incline during 5.8.8. I don't know why but I don't
452 honestly care since I probably want to be bug-compatible anyway (mst) */
454 /* ... my kingdom for a perl parser in perl ... (mst) */
456 #ifdef PERL_5_8_8_PLUS
458 const char *cf = CopFILE(PL_curcop);
459 if (cf && strlen(cf) > 7 && strnEQ(cf, "(eval ", 6)) {
460 /* must copy *{"::_<(eval N)[oldfilename:L]"}
461 * to *{"::_<newfilename"} */
462 char smallbuf[256], smallbuf2[256];
463 char *tmpbuf, *tmpbuf2;
465 STRLEN tmplen = strlen(cf);
466 STRLEN tmplen2 = strlen(s);
467 if (tmplen + 3 < sizeof smallbuf)
470 Newx(tmpbuf, tmplen + 3, char);
471 if (tmplen2 + 3 < sizeof smallbuf2)
474 Newx(tmpbuf2, tmplen2 + 3, char);
475 tmpbuf[0] = tmpbuf2[0] = '_';
476 tmpbuf[1] = tmpbuf2[1] = '<';
477 memcpy(tmpbuf + 2, cf, ++tmplen);
478 memcpy(tmpbuf2 + 2, s, ++tmplen2);
480 gvp = (GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, FALSE);
482 gv2 = *(GV**)hv_fetch(PL_defstash, tmpbuf2, tmplen2, TRUE);
484 gv_init(gv2, PL_defstash, tmpbuf2, tmplen2, FALSE);
485 /* adjust ${"::_<newfilename"} to store the new file name */
486 GvSV(gv2) = newSVpvn(tmpbuf2 + 2, tmplen2 - 2);
487 GvHV(gv2) = (HV*)SvREFCNT_inc(GvHV(*gvp));
488 GvAV(gv2) = (AV*)SvREFCNT_inc(GvAV(*gvp));
490 if (tmpbuf != smallbuf) Safefree(tmpbuf);
491 if (tmpbuf2 != smallbuf2) Safefree(tmpbuf2);
495 /* second endif closes out the "are we 5.8.(8+)" conditional */
496 CopFILE_free(PL_curcop);
497 CopFILE_set(PL_curcop, s);
500 CopLINE_set(PL_curcop, atoi(n)-1);
504 takes: start position in buffer
505 keep_quoted preserve \ on the embedded delimiter(s)
506 keep_delims preserve the delimiters around the string
507 returns: position to continue reading from buffer
508 side-effects: multi_start, multi_close, lex_repl or lex_stuff, and
509 updates the read buffer.
511 This subroutine pulls a string out of the input. It is called for:
512 q single quotes q(literal text)
513 ' single quotes 'literal text'
514 qq double quotes qq(interpolate $here please)
515 " double quotes "interpolate $here please"
516 qx backticks qx(/bin/ls -l)
517 ` backticks `/bin/ls -l`
518 qw quote words @EXPORT_OK = qw( func() $spam )
519 m// regexp match m/this/
520 s/// regexp substitute s/this/that/
521 tr/// string transliterate tr/this/that/
522 y/// string transliterate y/this/that/
523 ($*@) sub prototypes sub foo ($)
524 (stuff) sub attr parameters sub foo : attr(stuff)
525 <> readline or globs <FOO>, <>, <$fh>, or <*.c>
527 In most of these cases (all but <>, patterns and transliterate)
528 yylex() calls scan_str(). m// makes yylex() call scan_pat() which
529 calls scan_str(). s/// makes yylex() call scan_subst() which calls
530 scan_str(). tr/// and y/// make yylex() call scan_trans() which
533 It skips whitespace before the string starts, and treats the first
534 character as the delimiter. If the delimiter is one of ([{< then
535 the corresponding "close" character )]}> is used as the closing
536 delimiter. It allows quoting of delimiters, and if the string has
537 balanced delimiters ([{<>}]) it allows nesting.
539 On success, the SV with the resulting string is put into lex_stuff or,
540 if that is already non-NULL, into lex_repl. The second case occurs only
541 when parsing the RHS of the special constructs s/// and tr/// (y///).
542 For convenience, the terminating delimiter character is stuffed into
547 S_scan_str(pTHX_ char *start, int keep_quoted, int keep_delims)
549 SV *sv; /* scalar value: string */
550 char *tmps; /* temp string, used for delimiter matching */
551 register char *s = start; /* current position in the buffer */
552 register char term; /* terminating character */
553 register char *to; /* current position in the sv's data */
554 I32 brackets = 1; /* bracket nesting level */
555 bool has_utf8 = FALSE; /* is there any utf8 content? */
556 I32 termcode; /* terminating char. code */
557 /* 5.8.7+ uses UTF8_MAXBYTES but also its utf8.h defs _MAXLEN to it so
558 I'm reasonably hopeful this won't destroy anything (mst) */
559 U8 termstr[UTF8_MAXLEN]; /* terminating string */
560 STRLEN termlen; /* length of terminating string */
561 char *last = NULL; /* last position for nesting bracket */
563 /* skip space before the delimiter */
567 /* mark where we are, in case we need to report errors */
570 /* after skipping whitespace, the next character is the terminator */
573 termcode = termstr[0] = term;
577 termcode = utf8_to_uvchr((U8*)s, &termlen);
578 Copy(s, termstr, termlen, U8);
579 if (!UTF8_IS_INVARIANT(term))
583 /* mark where we are */
584 PL_multi_start = CopLINE(PL_curcop);
585 PL_multi_open = term;
587 /* find corresponding closing delimiter */
588 if (term && (tmps = strchr("([{< )]}> )]}>",term)))
589 termcode = termstr[0] = term = tmps[5];
591 PL_multi_close = term;
593 /* create a new SV to hold the contents. 87 is leak category, I'm
594 assuming. 79 is the SV's initial length. What a random number. */
596 sv_upgrade(sv, SVt_PVIV);
597 SvIV_set(sv, termcode);
598 (void)SvPOK_only(sv); /* validate pointer */
600 /* move past delimiter and try to read a complete string */
602 sv_catpvn(sv, s, termlen);
605 if (PL_encoding && !UTF) {
609 int offset = s - SvPVX_const(PL_linestr);
610 const bool found = sv_cat_decode(sv, PL_encoding, PL_linestr,
611 &offset, (char*)termstr, termlen);
612 const char *ns = SvPVX_const(PL_linestr) + offset;
613 char *svlast = SvEND(sv) - 1;
615 for (; s < ns; s++) {
616 if (*s == '\n' && !PL_rsfp)
617 CopLINE_inc(PL_curcop);
622 /* handle quoted delimiters */
623 if (SvCUR(sv) > 1 && *(svlast-1) == '\\') {
625 for (t = svlast-2; t >= SvPVX_const(sv) && *t == '\\';)
627 if ((svlast-1 - t) % 2) {
631 SvCUR_set(sv, SvCUR(sv) - 1);
636 if (PL_multi_open == PL_multi_close) {
644 for (t = w = last; t < svlast; w++, t++) {
645 /* At here, all closes are "was quoted" one,
646 so we don't check PL_multi_close. */
648 if (!keep_quoted && *(t+1) == PL_multi_open)
653 else if (*t == PL_multi_open)
661 SvCUR_set(sv, w - SvPVX_const(sv));
670 SvCUR_set(sv, SvCUR(sv) - 1);
676 /* extend sv if need be */
677 SvGROW(sv, SvCUR(sv) + (PL_bufend - s) + 1);
678 /* set 'to' to the next character in the sv's string */
679 to = SvPVX(sv)+SvCUR(sv);
681 /* if open delimiter is the close delimiter read unbridle */
682 if (PL_multi_open == PL_multi_close) {
683 for (; s < PL_bufend; s++,to++) {
684 /* embedded newlines increment the current line number */
685 if (*s == '\n' && !PL_rsfp)
686 CopLINE_inc(PL_curcop);
687 /* handle quoted delimiters */
688 if (*s == '\\' && s+1 < PL_bufend && term != '\\') {
689 if (!keep_quoted && s[1] == term)
691 /* any other quotes are simply copied straight through */
695 /* terminate when run out of buffer (the for() condition), or
696 have found the terminator */
697 else if (*s == term) {
700 if (s+termlen <= PL_bufend && memEQ(s, (char*)termstr, termlen))
703 else if (!has_utf8 && !UTF8_IS_INVARIANT((U8)*s) && UTF)
709 /* if the terminator isn't the same as the start character (e.g.,
710 matched brackets), we have to allow more in the quoting, and
711 be prepared for nested brackets.
714 /* read until we run out of string, or we find the terminator */
715 for (; s < PL_bufend; s++,to++) {
716 /* embedded newlines increment the line count */
717 if (*s == '\n' && !PL_rsfp)
718 CopLINE_inc(PL_curcop);
719 /* backslashes can escape the open or closing characters */
720 if (*s == '\\' && s+1 < PL_bufend) {
722 ((s[1] == PL_multi_open) || (s[1] == PL_multi_close)))
727 /* allow nested opens and closes */
728 else if (*s == PL_multi_close && --brackets <= 0)
730 else if (*s == PL_multi_open)
732 else if (!has_utf8 && !UTF8_IS_INVARIANT((U8)*s) && UTF)
737 /* terminate the copied string and update the sv's end-of-string */
739 SvCUR_set(sv, to - SvPVX_const(sv));
742 * this next chunk reads more into the buffer if we're not done yet
746 break; /* handle case where we are done yet :-) */
748 #ifndef PERL_STRICT_CR
749 if (to - SvPVX_const(sv) >= 2) {
750 if ((to[-2] == '\r' && to[-1] == '\n') ||
751 (to[-2] == '\n' && to[-1] == '\r'))
755 SvCUR_set(sv, to - SvPVX_const(sv));
757 else if (to[-1] == '\r')
760 else if (to - SvPVX_const(sv) == 1 && to[-1] == '\r')
765 /* if we're out of file, or a read fails, bail and reset the current
766 line marker so we can report where the unterminated string began
769 !(PL_oldoldbufptr = PL_oldbufptr = s = PL_linestart = filter_gets(PL_linestr, PL_rsfp, 0))) {
771 CopLINE_set(PL_curcop, (line_t)PL_multi_start);
774 /* we read a line, so increment our line counter */
775 CopLINE_inc(PL_curcop);
777 /* update debugger info */
778 if (PERLDB_LINE && PL_curstash != PL_debstash) {
779 SV *sv = NEWSV(88,0);
781 sv_upgrade(sv, SVt_PVMG);
782 sv_setsv(sv,PL_linestr);
785 av_store(CopFILEAV(PL_curcop), (I32)CopLINE(PL_curcop), sv);
788 /* having changed the buffer, we must update PL_bufend */
789 PL_bufend = SvPVX(PL_linestr) + SvCUR(PL_linestr);
790 PL_last_lop = PL_last_uni = Nullch;
793 /* at this point, we have successfully read the delimited string */
795 if (!PL_encoding || UTF) {
797 sv_catpvn(sv, s, termlen);
800 if (has_utf8 || PL_encoding)
803 PL_multi_end = CopLINE(PL_curcop);
805 /* if we allocated too much space, give some back */
806 if (SvCUR(sv) + 5 < SvLEN(sv)) {
807 SvLEN_set(sv, SvCUR(sv) + 1);
808 /* 5.8.8 uses SvPV_renew, no prior version actually has the damn thing (mst) */
809 #ifdef PERL_5_8_8_PLUS
810 SvPV_renew(sv, SvLEN(sv));
812 Renew(SvPVX(sv), SvLEN(sv), char);
816 /* decide whether this is the first or second quoted string we've read
829 * When the lexer realizes it knows the next token (for instance,
830 * it is reordering tokens for the parser) then it can call S_force_next
831 * to know what token to return the next time the lexer is called. Caller
832 * will need to set PL_nextval[], and possibly PL_expect to ensure the lexer
833 * handles the token correctly.
837 S_force_next(pTHX_ I32 type)
839 PL_nexttype[PL_nexttoke] = type;
841 if (PL_lex_state != LEX_KNOWNEXT) {
842 PL_lex_defer = PL_lex_state;
843 PL_lex_expect = PL_expect;
844 PL_lex_state = LEX_KNOWNEXT;