1 /* Parse a printf-style format string.
3 Copyright (C) 1986-2013 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
31 parse_format_string (char **arg)
36 char *sub_start, *current_substring;
37 struct format_piece *pieces;
40 enum argclass this_argclass;
44 /* Parse the format-control string and copy it into the string STRING,
45 processing some kinds of escape sequence. */
47 f = string = (char *) alloca (strlen (s) + 1);
49 while (*s != '"' && *s != '\0')
88 /* ??? TODO: handle other escape sequences. */
89 error (_("Unrecognized escape character \\%c in format string."),
99 /* Terminate our escape-processed copy. */
102 /* Whether the format string ended with double-quote or zero, we're
103 done with it; it's up to callers to complain about syntax. */
106 /* Need extra space for the '\0's. Doubling the size is sufficient. */
108 current_substring = xmalloc (strlen (string) * 2 + 1000);
110 max_pieces = strlen (string) + 2;
112 pieces = (struct format_piece *)
113 xmalloc (max_pieces * sizeof (struct format_piece));
117 /* Now scan the string for %-specs and see what kinds of args they want.
118 argclass classifies the %-specs so we can give printf-type functions
119 something of the right size. */
126 int seen_hash = 0, seen_zero = 0, lcount = 0, seen_prec = 0;
127 int seen_space = 0, seen_plus = 0;
128 int seen_big_l = 0, seen_h = 0, seen_big_h = 0;
129 int seen_big_d = 0, seen_double_big_d = 0;
132 /* Skip over "%%", it will become part of a literal piece. */
139 sub_start = current_substring;
141 strncpy (current_substring, prev_start, f - 1 - prev_start);
142 current_substring += f - 1 - prev_start;
143 *current_substring++ = '\0';
145 pieces[next_frag].string = sub_start;
146 pieces[next_frag].argclass = literal_piece;
151 /* Check the validity of the format specifier, and work
152 out what argument it expects. We only accept C89
153 format strings, with the exception of long long (which
156 /* The first part of a format specifier is a set of flag
158 while (strchr ("0-+ #", *f))
171 /* The next part of a format specifier is a width. */
172 while (strchr ("0123456789", *f))
175 /* The next part of a format specifier is a precision. */
180 while (strchr ("0123456789", *f))
184 /* The next part of a format specifier is a length modifier. */
205 /* Decimal32 modifier. */
211 /* Decimal64 and Decimal128 modifiers. */
216 /* Check for a Decimal128. */
220 seen_double_big_d = 1;
236 if (seen_space || seen_plus)
243 this_argclass = int_arg;
244 else if (lcount == 1)
245 this_argclass = long_arg;
247 this_argclass = long_long_arg;
254 this_argclass = lcount == 0 ? int_arg : wide_char_arg;
255 if (lcount > 1 || seen_h || seen_big_l)
257 if (seen_prec || seen_zero || seen_space || seen_plus)
262 this_argclass = ptr_arg;
263 if (lcount || seen_h || seen_big_l)
265 if (seen_prec || seen_zero || seen_space || seen_plus)
270 this_argclass = lcount == 0 ? string_arg : wide_string_arg;
271 if (lcount > 1 || seen_h || seen_big_l)
273 if (seen_zero || seen_space || seen_plus)
282 if (seen_big_h || seen_big_d || seen_double_big_d)
283 this_argclass = decfloat_arg;
285 this_argclass = long_double_arg;
287 this_argclass = double_arg;
289 if (lcount || seen_h)
294 error (_("`*' not supported for precision or width in printf"));
297 error (_("Format specifier `n' not supported in printf"));
300 error (_("Incomplete format specifier at end of format string"));
303 error (_("Unrecognized format specifier '%c' in printf"), *f);
307 error (_("Inappropriate modifiers to "
308 "format specifier '%c' in printf"),
313 sub_start = current_substring;
315 if (lcount > 1 && USE_PRINTF_I64)
317 /* Windows' printf does support long long, but not the usual way.
318 Convert %lld to %I64d. */
319 int length_before_ll = f - percent_loc - 1 - lcount;
321 strncpy (current_substring, percent_loc, length_before_ll);
322 strcpy (current_substring + length_before_ll, "I64");
323 current_substring[length_before_ll + 3] =
324 percent_loc[length_before_ll + lcount];
325 current_substring += length_before_ll + 4;
327 else if (this_argclass == wide_string_arg
328 || this_argclass == wide_char_arg)
330 /* Convert %ls or %lc to %s. */
331 int length_before_ls = f - percent_loc - 2;
333 strncpy (current_substring, percent_loc, length_before_ls);
334 strcpy (current_substring + length_before_ls, "s");
335 current_substring += length_before_ls + 2;
339 strncpy (current_substring, percent_loc, f - percent_loc);
340 current_substring += f - percent_loc;
343 *current_substring++ = '\0';
347 pieces[next_frag].string = sub_start;
348 pieces[next_frag].argclass = this_argclass;
352 /* Record the remainder of the string. */
354 sub_start = current_substring;
356 strncpy (current_substring, prev_start, f - prev_start);
357 current_substring += f - prev_start;
358 *current_substring++ = '\0';
360 pieces[next_frag].string = sub_start;
361 pieces[next_frag].argclass = literal_piece;
364 /* Record an end-of-array marker. */
366 pieces[next_frag].string = NULL;
367 pieces[next_frag].argclass = literal_piece;
373 free_format_pieces (struct format_piece *pieces)
378 /* We happen to know that all the string pieces are in the block
379 pointed to by the first string piece. */
380 if (pieces[0].string)
381 xfree (pieces[0].string);
387 free_format_pieces_cleanup (void *ptr)
389 void **location = ptr;
391 if (location == NULL)
394 if (*location != NULL)
396 free_format_pieces (*location);