1 /* Various declarations for language-independent pretty-print subroutines.
2 Copyright (C) 2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
3 Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net>
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
25 #include "pretty-print.h"
33 #define obstack_chunk_alloc xmalloc
34 #define obstack_chunk_free free
36 /* A pointer to the formatted diagnostic message. */
37 #define pp_formatted_text_data(PP) \
38 ((const char *) obstack_base (pp_base (PP)->buffer->obstack))
40 /* Format an integer given by va_arg (ARG, type-specifier T) where
41 type-specifier is a precision modifier as indicated by PREC. F is
42 a string used to construct the appropriate format-specifier. */
43 #define pp_integer_with_precision(PP, ARG, PREC, T, F) \
48 pp_scalar (PP, "%" F, va_arg (ARG, T)); \
52 pp_scalar (PP, "%l" F, va_arg (ARG, long T)); \
56 pp_scalar (PP, "%" HOST_LONG_LONG_FORMAT F, va_arg (ARG, long long T)); \
65 /* Subroutine of pp_set_maximum_length. Set up PRETTY-PRINTER's
66 internal maximum characters per line. */
68 pp_set_real_maximum_length (pretty_printer *pp)
70 /* If we're told not to wrap lines then do the obvious thing. In case
71 we'll emit prefix only once per message, it is appropriate
72 not to increase unnecessarily the line-length cut-off. */
73 if (!pp_is_wrapping_line (pp)
74 || pp_prefixing_rule (pp) == DIAGNOSTICS_SHOW_PREFIX_ONCE
75 || pp_prefixing_rule (pp) == DIAGNOSTICS_SHOW_PREFIX_NEVER)
76 pp->maximum_length = pp_line_cutoff (pp);
79 int prefix_length = pp->prefix ? strlen (pp->prefix) : 0;
80 /* If the prefix is ridiculously too long, output at least
82 if (pp_line_cutoff (pp) - prefix_length < 32)
83 pp->maximum_length = pp_line_cutoff (pp) + 32;
85 pp->maximum_length = pp_line_cutoff (pp);
89 /* Clear PRETTY-PRINTER's output state. */
91 pp_clear_state (pretty_printer *pp)
93 pp->emitted_prefix = false;
94 pp_indentation (pp) = 0;
97 /* Flush the formatted text of PRETTY-PRINTER onto the attached stream. */
99 pp_write_text_to_stream (pretty_printer *pp)
101 const char *text = pp_formatted_text (pp);
102 fputs (text, pp->buffer->stream);
103 pp_clear_output_area (pp);
106 /* Wrap a text delimited by START and END into PRETTY-PRINTER. */
108 pp_wrap_text (pretty_printer *pp, const char *start, const char *end)
110 bool wrapping_line = pp_is_wrapping_line (pp);
114 /* Dump anything bordered by whitespaces. */
116 const char *p = start;
117 while (p != end && !ISBLANK (*p) && *p != '\n')
120 && p - start >= pp_remaining_character_count_for_line (pp))
122 pp_append_text (pp, start, p);
126 if (start != end && ISBLANK (*start))
131 if (start != end && *start == '\n')
139 /* Same as pp_wrap_text but wrap text only when in line-wrapping mode. */
141 pp_maybe_wrap_text (pretty_printer *pp, const char *start, const char *end)
143 if (pp_is_wrapping_line (pp))
144 pp_wrap_text (pp, start, end);
146 pp_append_text (pp, start, end);
149 /* Append to the output area of PRETTY-PRINTER a string specified by its
150 STARTing character and LENGTH. */
152 pp_append_r (pretty_printer *pp, const char *start, int length)
154 obstack_grow (pp->buffer->obstack, start, length);
155 pp->buffer->line_length += length;
158 /* Insert enough spaces into the output area of PRETTY-PRINTER to bring
159 the column position to the current indentation level, assuming that a
160 newline has just been written to the buffer. */
162 pp_base_indent (pretty_printer *pp)
164 int n = pp_indentation (pp);
167 for (i = 0; i < n; ++i)
171 /* The following format specifiers are recognized as being client independent:
172 %d, %i: (signed) integer in base ten.
173 %u: unsigned integer in base ten.
174 %o: unsigned integer in base eight.
175 %x: unsigned integer in base sixteen.
176 %ld, %li, %lo, %lu, %lx: long versions of the above.
177 %lld, %lli, %llo, %llu, %llx: long long versions.
178 %wd, %wi, %wo, %wu, %wx: HOST_WIDE_INT versions.
182 %m: strerror(text->err_no) - does not consume a value from args_ptr.
186 %': apostrophe (should only be used in untranslated messages;
187 translations should use appropriate punctuation directly).
188 %.*s: a substring the length of which is specified by an argument
190 %Ns: likewise, but length specified as constant in the format string.
191 %K: a statement, from which EXPR_LOCATION and TREE_BLOCK will be recorded.
192 Flag 'q': quote formatted text (must come immediately after '%').
194 Arguments can be used sequentially, or through %N$ resp. *N$
195 notation Nth argument after the format string. If %N$ / *N$
196 notation is used, it must be used for all arguments, except %m, %%,
197 %<, %> and %', which may not have a number, as they do not consume
198 an argument. When %M$.*N$s is used, M must be N + 1. (This may
199 also be written %M$.*s, provided N is not otherwise used.) The
200 format string must have conversion specifiers with argument numbers
201 1 up to highest argument; each argument may only be used once.
202 A format string can have at most 30 arguments. */
204 /* Formatting phases 1 and 2: render TEXT->format_spec plus
205 TEXT->args_ptr into a series of chunks in PP->buffer->args[].
206 Phase 3 is in pp_base_format_text. */
209 pp_base_format (pretty_printer *pp, text_info *text)
211 output_buffer *buffer = pp->buffer;
214 struct chunk_info *new_chunk_array;
216 unsigned int curarg = 0, chunk = 0, argno;
217 pp_wrapping_mode_t old_wrapping_mode;
218 bool any_unnumbered = false, any_numbered = false;
219 const char **formatters[PP_NL_ARGMAX];
221 /* Allocate a new chunk structure. */
222 new_chunk_array = XOBNEW (&buffer->chunk_obstack, struct chunk_info);
223 new_chunk_array->prev = buffer->cur_chunk_array;
224 buffer->cur_chunk_array = new_chunk_array;
225 args = new_chunk_array->args;
227 /* Formatting phase 1: split up TEXT->format_spec into chunks in
228 PP->buffer->args[]. Even-numbered chunks are to be output
229 verbatim, odd-numbered chunks are format specifiers.
230 %m, %%, %<, %>, and %' are replaced with the appropriate text at
233 memset (formatters, 0, sizeof formatters);
235 for (p = text->format_spec; *p; )
237 while (*p != '\0' && *p != '%')
239 obstack_1grow (&buffer->chunk_obstack, *p);
252 obstack_1grow (&buffer->chunk_obstack, '%');
257 obstack_grow (&buffer->chunk_obstack,
258 open_quote, strlen (open_quote));
264 obstack_grow (&buffer->chunk_obstack,
265 close_quote, strlen (close_quote));
271 const char *errstr = xstrerror (text->err_no);
272 obstack_grow (&buffer->chunk_obstack, errstr, strlen (errstr));
278 /* Handled in phase 2. Terminate the plain chunk here. */
279 obstack_1grow (&buffer->chunk_obstack, '\0');
280 gcc_assert (chunk < PP_NL_ARGMAX * 2);
281 args[chunk++] = XOBFINISH (&buffer->chunk_obstack, const char *);
288 argno = strtoul (p, &end, 10) - 1;
290 gcc_assert (*p == '$');
294 gcc_assert (!any_unnumbered);
299 any_unnumbered = true;
300 gcc_assert (!any_numbered);
302 gcc_assert (argno < PP_NL_ARGMAX);
303 gcc_assert (!formatters[argno]);
304 formatters[argno] = &args[chunk];
307 obstack_1grow (&buffer->chunk_obstack, *p);
310 while (strchr ("qwl+#", p[-1]));
314 /* We handle '%.Ns' and '%.*s' or '%M$.*N$s'
315 (where M == N + 1). */
320 obstack_1grow (&buffer->chunk_obstack, *p);
323 while (ISDIGIT (p[-1]));
324 gcc_assert (p[-1] == 's');
328 gcc_assert (*p == '*');
329 obstack_1grow (&buffer->chunk_obstack, '*');
335 unsigned int argno2 = strtoul (p, &end, 10) - 1;
337 gcc_assert (argno2 == argno - 1);
338 gcc_assert (!any_unnumbered);
339 gcc_assert (*p == '$');
342 formatters[argno2] = formatters[argno];
346 gcc_assert (!any_numbered);
347 formatters[argno+1] = formatters[argno];
350 gcc_assert (*p == 's');
351 obstack_1grow (&buffer->chunk_obstack, 's');
358 obstack_1grow (&buffer->chunk_obstack, '\0');
359 gcc_assert (chunk < PP_NL_ARGMAX * 2);
360 args[chunk++] = XOBFINISH (&buffer->chunk_obstack, const char *);
363 obstack_1grow (&buffer->chunk_obstack, '\0');
364 gcc_assert (chunk < PP_NL_ARGMAX * 2);
365 args[chunk++] = XOBFINISH (&buffer->chunk_obstack, const char *);
368 /* Set output to the argument obstack, and switch line-wrapping and
370 buffer->obstack = &buffer->chunk_obstack;
371 old_wrapping_mode = pp_set_verbatim_wrapping (pp);
373 /* Second phase. Replace each formatter with the formatted text it
376 for (argno = 0; formatters[argno]; argno++)
384 /* We do not attempt to enforce any ordering on the modifier
387 for (p = *formatters[argno];; p++)
412 /* We don't support precision beyond that of "long long". */
413 gcc_assert (precision < 2);
420 gcc_assert (!wide || precision == 0);
423 pp_string (pp, open_quote);
428 pp_character (pp, va_arg (*text->args_ptr, int));
434 pp_wide_integer (pp, va_arg (*text->args_ptr, HOST_WIDE_INT));
436 pp_integer_with_precision
437 (pp, *text->args_ptr, precision, int, "d");
442 pp_scalar (pp, "%" HOST_WIDE_INT_PRINT "o",
443 va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
445 pp_integer_with_precision
446 (pp, *text->args_ptr, precision, unsigned, "o");
450 pp_string (pp, va_arg (*text->args_ptr, const char *));
454 pp_pointer (pp, va_arg (*text->args_ptr, void *));
459 pp_scalar (pp, HOST_WIDE_INT_PRINT_UNSIGNED,
460 va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
462 pp_integer_with_precision
463 (pp, *text->args_ptr, precision, unsigned, "u");
468 pp_scalar (pp, HOST_WIDE_INT_PRINT_HEX,
469 va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
471 pp_integer_with_precision
472 (pp, *text->args_ptr, precision, unsigned, "x");
477 tree t = va_arg (*text->args_ptr, tree), block;
478 gcc_assert (text->locus != NULL);
479 *text->locus = EXPR_LOCATION (t);
480 gcc_assert (text->abstract_origin != NULL);
481 block = TREE_BLOCK (t);
482 *text->abstract_origin = NULL;
484 && TREE_CODE (block) == BLOCK
485 && BLOCK_ABSTRACT_ORIGIN (block))
487 tree ao = BLOCK_ABSTRACT_ORIGIN (block);
489 while (TREE_CODE (ao) == BLOCK
490 && BLOCK_ABSTRACT_ORIGIN (ao)
491 && BLOCK_ABSTRACT_ORIGIN (ao) != ao)
492 ao = BLOCK_ABSTRACT_ORIGIN (ao);
494 if (TREE_CODE (ao) == FUNCTION_DECL)
496 *text->abstract_origin = block;
499 block = BLOCK_SUPERCONTEXT (block);
509 /* We handle '%.Ns' and '%.*s' or '%M$.*N$s'
510 (where M == N + 1). The format string should be verified
511 already from the first phase. */
516 n = strtoul (p, &end, 10);
518 gcc_assert (*p == 's');
522 gcc_assert (*p == '*');
524 gcc_assert (*p == 's');
525 n = va_arg (*text->args_ptr, int);
527 /* This consumes a second entry in the formatters array. */
528 gcc_assert (formatters[argno] == formatters[argno+1]);
532 s = va_arg (*text->args_ptr, const char *);
533 pp_append_text (pp, s, s + n);
541 gcc_assert (pp_format_decoder (pp));
542 ok = pp_format_decoder (pp) (pp, text, p,
543 precision, wide, plus, hash);
549 pp_string (pp, close_quote);
551 obstack_1grow (&buffer->chunk_obstack, '\0');
552 *formatters[argno] = XOBFINISH (&buffer->chunk_obstack, const char *);
555 #ifdef ENABLE_CHECKING
556 for (; argno < PP_NL_ARGMAX; argno++)
557 gcc_assert (!formatters[argno]);
560 /* Revert to normal obstack and wrapping mode. */
561 buffer->obstack = &buffer->formatted_obstack;
562 buffer->line_length = 0;
563 pp_wrapping_mode (pp) = old_wrapping_mode;
567 /* Format of a message pointed to by TEXT. */
569 pp_base_output_formatted_text (pretty_printer *pp)
572 output_buffer *buffer = pp_buffer (pp);
573 struct chunk_info *chunk_array = buffer->cur_chunk_array;
574 const char **args = chunk_array->args;
576 gcc_assert (buffer->obstack == &buffer->formatted_obstack);
577 gcc_assert (buffer->line_length == 0);
579 /* This is a third phase, first 2 phases done in pp_base_format_args.
580 Now we actually print it. */
581 for (chunk = 0; args[chunk]; chunk++)
582 pp_string (pp, args[chunk]);
584 /* Deallocate the chunk structure and everything after it (i.e. the
585 associated series of formatted strings). */
586 buffer->cur_chunk_array = chunk_array->prev;
587 obstack_free (&buffer->chunk_obstack, chunk_array);
590 /* Helper subroutine of output_verbatim and verbatim. Do the appropriate
591 settings needed by BUFFER for a verbatim formatting. */
593 pp_base_format_verbatim (pretty_printer *pp, text_info *text)
595 /* Set verbatim mode. */
596 pp_wrapping_mode_t oldmode = pp_set_verbatim_wrapping (pp);
598 /* Do the actual formatting. */
599 pp_format (pp, text);
600 pp_output_formatted_text (pp);
602 /* Restore previous settings. */
603 pp_wrapping_mode (pp) = oldmode;
606 /* Flush the content of BUFFER onto the attached stream. */
608 pp_base_flush (pretty_printer *pp)
610 pp_write_text_to_stream (pp);
612 fputc ('\n', pp->buffer->stream);
613 fflush (pp->buffer->stream);
614 pp_needs_newline (pp) = false;
617 /* Sets the number of maximum characters per line PRETTY-PRINTER can
618 output in line-wrapping mode. A LENGTH value 0 suppresses
621 pp_base_set_line_maximum_length (pretty_printer *pp, int length)
623 pp_line_cutoff (pp) = length;
624 pp_set_real_maximum_length (pp);
627 /* Clear PRETTY-PRINTER output area text info. */
629 pp_base_clear_output_area (pretty_printer *pp)
631 obstack_free (pp->buffer->obstack, obstack_base (pp->buffer->obstack));
632 pp->buffer->line_length = 0;
635 /* Set PREFIX for PRETTY-PRINTER. */
637 pp_base_set_prefix (pretty_printer *pp, const char *prefix)
640 pp_set_real_maximum_length (pp);
641 pp->emitted_prefix = false;
642 pp_indentation (pp) = 0;
645 /* Free PRETTY-PRINTER's prefix, a previously malloc()'d string. */
647 pp_base_destroy_prefix (pretty_printer *pp)
649 if (pp->prefix != NULL)
651 free (CONST_CAST (char *, pp->prefix));
656 /* Write out PRETTY-PRINTER's prefix. */
658 pp_base_emit_prefix (pretty_printer *pp)
660 if (pp->prefix != NULL)
662 switch (pp_prefixing_rule (pp))
665 case DIAGNOSTICS_SHOW_PREFIX_NEVER:
668 case DIAGNOSTICS_SHOW_PREFIX_ONCE:
669 if (pp->emitted_prefix)
674 pp_indentation (pp) += 3;
677 case DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE:
679 int prefix_length = strlen (pp->prefix);
680 pp_append_r (pp, pp->prefix, prefix_length);
681 pp->emitted_prefix = true;
688 /* Construct a PRETTY-PRINTER with PREFIX and of MAXIMUM_LENGTH
689 characters per line. */
691 pp_construct (pretty_printer *pp, const char *prefix, int maximum_length)
693 memset (pp, 0, sizeof (pretty_printer));
694 pp->buffer = XCNEW (output_buffer);
695 obstack_init (&pp->buffer->chunk_obstack);
696 obstack_init (&pp->buffer->formatted_obstack);
697 pp->buffer->obstack = &pp->buffer->formatted_obstack;
698 pp->buffer->stream = stderr;
699 pp_line_cutoff (pp) = maximum_length;
700 pp_prefixing_rule (pp) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
701 pp_set_prefix (pp, prefix);
702 pp_translate_identifiers (pp) = true;
705 /* Append a string delimited by START and END to the output area of
706 PRETTY-PRINTER. No line wrapping is done. However, if beginning a
707 new line then emit PRETTY-PRINTER's prefix and skip any leading
708 whitespace if appropriate. The caller must ensure that it is
711 pp_base_append_text (pretty_printer *pp, const char *start, const char *end)
713 /* Emit prefix and skip whitespace if we're starting a new line. */
714 if (pp->buffer->line_length == 0)
717 if (pp_is_wrapping_line (pp))
718 while (start != end && *start == ' ')
721 pp_append_r (pp, start, end - start);
724 /* Finishes constructing a NULL-terminated character string representing
725 the PRETTY-PRINTED text. */
727 pp_base_formatted_text (pretty_printer *pp)
729 obstack_1grow (pp->buffer->obstack, '\0');
730 return pp_formatted_text_data (pp);
733 /* Return a pointer to the last character emitted in PRETTY-PRINTER's
734 output area. A NULL pointer means no character available. */
736 pp_base_last_position_in_text (const pretty_printer *pp)
738 const char *p = NULL;
739 struct obstack *text = pp->buffer->obstack;
741 if (obstack_base (text) != obstack_next_free (text))
742 p = ((const char *) obstack_next_free (text)) - 1;
746 /* Return the amount of characters PRETTY-PRINTER can accept to
747 make a full line. Meaningful only in line-wrapping mode. */
749 pp_base_remaining_character_count_for_line (pretty_printer *pp)
751 return pp->maximum_length - pp->buffer->line_length;
755 /* Format a message into BUFFER a la printf. */
757 pp_printf (pretty_printer *pp, const char *msg, ...)
765 text.format_spec = msg;
767 pp_format (pp, &text);
768 pp_output_formatted_text (pp);
773 /* Output MESSAGE verbatim into BUFFER. */
775 pp_verbatim (pretty_printer *pp, const char *msg, ...)
783 text.format_spec = msg;
785 pp_format_verbatim (pp, &text);
791 /* Have PRETTY-PRINTER start a new line. */
793 pp_base_newline (pretty_printer *pp)
795 obstack_1grow (pp->buffer->obstack, '\n');
796 pp->buffer->line_length = 0;
799 /* Have PRETTY-PRINTER add a CHARACTER. */
801 pp_base_character (pretty_printer *pp, int c)
803 if (pp_is_wrapping_line (pp)
804 && pp_remaining_character_count_for_line (pp) <= 0)
810 obstack_1grow (pp->buffer->obstack, c);
811 ++pp->buffer->line_length;
814 /* Append a STRING to the output area of PRETTY-PRINTER; the STRING may
815 be line-wrapped if in appropriate mode. */
817 pp_base_string (pretty_printer *pp, const char *str)
819 pp_maybe_wrap_text (pp, str, str + (str ? strlen (str) : 0));
822 /* Maybe print out a whitespace if needed. */
825 pp_base_maybe_space (pretty_printer *pp)
827 if (pp_base (pp)->padding != pp_none)
830 pp_base (pp)->padding = pp_none;
834 /* Print the identifier ID to PRETTY-PRINTER. */
837 pp_base_tree_identifier (pretty_printer *pp, tree id)
839 if (pp_translate_identifiers (pp))
841 const char *text = identifier_to_locale (IDENTIFIER_POINTER (id));
842 pp_append_text (pp, text, text + strlen (text));
845 pp_append_text (pp, IDENTIFIER_POINTER (id),
846 IDENTIFIER_POINTER (id) + IDENTIFIER_LENGTH (id));
849 /* The string starting at P has LEN (at least 1) bytes left; if they
850 start with a valid UTF-8 sequence, return the length of that
851 sequence and set *VALUE to the value of that sequence, and
852 otherwise return 0 and set *VALUE to (unsigned int) -1. */
855 decode_utf8_char (const unsigned char *p, size_t len, unsigned int *value)
866 for (t = *p; t & 0x80; t <<= 1)
869 if (utf8_len > len || utf8_len < 2 || utf8_len > 6)
871 *value = (unsigned int) -1;
874 ch = *p & ((1 << (7 - utf8_len)) - 1);
875 for (i = 1; i < utf8_len; i++)
877 unsigned int u = p[i];
878 if ((u & 0xC0) != 0x80)
880 *value = (unsigned int) -1;
883 ch = (ch << 6) | (u & 0x3F);
885 if ( (ch <= 0x7F && utf8_len > 1)
886 || (ch <= 0x7FF && utf8_len > 2)
887 || (ch <= 0xFFFF && utf8_len > 3)
888 || (ch <= 0x1FFFFF && utf8_len > 4)
889 || (ch <= 0x3FFFFFF && utf8_len > 5)
890 || (ch >= 0xD800 && ch <= 0xDFFF))
892 *value = (unsigned int) -1;
905 /* Given IDENT, an identifier in the internal encoding, return a
906 version of IDENT suitable for diagnostics in the locale character
907 set: either IDENT itself, or a garbage-collected string converted
908 to the locale character set and using escape sequences if not
909 representable in the locale character set or containing control
910 characters or invalid byte sequences. Existing backslashes in
911 IDENT are not doubled, so the result may not uniquely specify the
912 contents of an arbitrary byte sequence identifier. */
915 identifier_to_locale (const char *ident)
917 const unsigned char *uid = (const unsigned char *) ident;
918 size_t idlen = strlen (ident);
919 bool valid_printable_utf8 = true;
920 bool all_ascii = true;
923 for (i = 0; i < idlen;)
926 size_t utf8_len = decode_utf8_char (&uid[i], idlen - i, &c);
927 if (utf8_len == 0 || c <= 0x1F || (c >= 0x7F && c <= 0x9F))
929 valid_printable_utf8 = false;
937 /* If IDENT contains invalid UTF-8 sequences (which may occur with
938 attributes putting arbitrary byte sequences in identifiers), or
939 control characters, we use octal escape sequences for all bytes
940 outside printable ASCII. */
941 if (!valid_printable_utf8)
943 char *ret = GGC_NEWVEC (char, 4 * idlen + 1);
945 for (i = 0; i < idlen; i++)
947 if (uid[i] > 0x1F && uid[i] < 0x7F)
951 sprintf (p, "\\%03o", uid[i]);
959 /* Otherwise, if it is valid printable ASCII, or printable UTF-8
960 with the locale character set being UTF-8, IDENT is used. */
961 if (all_ascii || locale_utf8)
964 /* Otherwise IDENT is converted to the locale character set if
966 #if defined ENABLE_NLS && defined HAVE_LANGINFO_CODESET && HAVE_ICONV
967 if (locale_encoding != NULL)
969 iconv_t cd = iconv_open (locale_encoding, "UTF-8");
970 bool conversion_ok = true;
972 if (cd != (iconv_t) -1)
974 size_t ret_alloc = 4 * idlen + 1;
977 /* Repeat the whole conversion process as needed with
978 larger buffers so non-reversible transformations can
979 always be detected. */
980 ICONV_CONST char *inbuf = CONST_CAST (char *, ident);
982 size_t inbytesleft = idlen;
983 size_t outbytesleft = ret_alloc - 1;
986 ret = GGC_NEWVEC (char, ret_alloc);
989 if (iconv (cd, 0, 0, 0, 0) == (size_t) -1)
991 conversion_ok = false;
995 iconv_ret = iconv (cd, &inbuf, &inbytesleft,
996 &outbuf, &outbytesleft);
997 if (iconv_ret == (size_t) -1 || inbytesleft != 0)
1008 conversion_ok = false;
1012 else if (iconv_ret != 0)
1014 conversion_ok = false;
1017 /* Return to initial shift state. */
1018 if (iconv (cd, 0, 0, &outbuf, &outbytesleft) == (size_t) -1)
1029 conversion_ok = false;
1043 /* Otherwise, convert non-ASCII characters in IDENT to UCNs. */
1045 char *ret = GGC_NEWVEC (char, 10 * idlen + 1);
1047 for (i = 0; i < idlen;)
1050 size_t utf8_len = decode_utf8_char (&uid[i], idlen - i, &c);
1055 sprintf (p, "\\U%08x", c);