1 /* Parse a printf-style format string.
3 Copyright (C) 1986-2018 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/>. */
20 #include "common-defs.h"
23 format_pieces::format_pieces (const char **arg
)
27 const char *prev_start
;
28 const char *percent_loc
;
29 char *sub_start
, *current_substring
;
30 enum argclass this_argclass
;
34 /* Parse the format-control string and copy it into the string STRING,
35 processing some kinds of escape sequence. */
37 f
= string
= (char *) alloca (strlen (s
) + 1);
39 while (*s
!= '"' && *s
!= '\0')
78 /* ??? TODO: handle other escape sequences. */
79 error (_("Unrecognized escape character \\%c in format string."),
89 /* Terminate our escape-processed copy. */
92 /* Whether the format string ended with double-quote or zero, we're
93 done with it; it's up to callers to complain about syntax. */
96 /* Need extra space for the '\0's. Doubling the size is sufficient. */
98 current_substring
= (char *) xmalloc (strlen (string
) * 2 + 1000);
99 m_storage
.reset (current_substring
);
101 /* Now scan the string for %-specs and see what kinds of args they want.
102 argclass classifies the %-specs so we can give printf-type functions
103 something of the right size. */
110 int seen_hash
= 0, seen_zero
= 0, lcount
= 0, seen_prec
= 0;
111 int seen_space
= 0, seen_plus
= 0;
112 int seen_big_l
= 0, seen_h
= 0, seen_big_h
= 0;
113 int seen_big_d
= 0, seen_double_big_d
= 0;
116 /* Skip over "%%", it will become part of a literal piece. */
123 sub_start
= current_substring
;
125 strncpy (current_substring
, prev_start
, f
- 1 - prev_start
);
126 current_substring
+= f
- 1 - prev_start
;
127 *current_substring
++ = '\0';
129 m_pieces
.emplace_back (sub_start
, literal_piece
);
133 /* Check the validity of the format specifier, and work
134 out what argument it expects. We only accept C89
135 format strings, with the exception of long long (which
138 /* The first part of a format specifier is a set of flag
140 while (*f
!= '\0' && strchr ("0-+ #", *f
))
153 /* The next part of a format specifier is a width. */
154 while (*f
!= '\0' && strchr ("0123456789", *f
))
157 /* The next part of a format specifier is a precision. */
162 while (*f
!= '\0' && strchr ("0123456789", *f
))
166 /* The next part of a format specifier is a length modifier. */
187 /* Decimal32 modifier. */
193 /* Decimal64 and Decimal128 modifiers. */
198 /* Check for a Decimal128. */
202 seen_double_big_d
= 1;
218 if (seen_space
|| seen_plus
)
225 this_argclass
= int_arg
;
226 else if (lcount
== 1)
227 this_argclass
= long_arg
;
229 this_argclass
= long_long_arg
;
236 this_argclass
= lcount
== 0 ? int_arg
: wide_char_arg
;
237 if (lcount
> 1 || seen_h
|| seen_big_l
)
239 if (seen_prec
|| seen_zero
|| seen_space
|| seen_plus
)
244 this_argclass
= ptr_arg
;
245 if (lcount
|| seen_h
|| seen_big_l
)
249 if (seen_hash
|| seen_zero
|| seen_space
|| seen_plus
)
254 this_argclass
= lcount
== 0 ? string_arg
: wide_string_arg
;
255 if (lcount
> 1 || seen_h
|| seen_big_l
)
257 if (seen_zero
|| seen_space
|| seen_plus
)
266 if (seen_double_big_d
)
267 this_argclass
= dec128float_arg
;
269 this_argclass
= dec64float_arg
;
271 this_argclass
= dec32float_arg
;
273 this_argclass
= long_double_arg
;
275 this_argclass
= double_arg
;
277 if (lcount
|| seen_h
)
282 error (_("`*' not supported for precision or width in printf"));
285 error (_("Format specifier `n' not supported in printf"));
288 error (_("Incomplete format specifier at end of format string"));
291 error (_("Unrecognized format specifier '%c' in printf"), *f
);
295 error (_("Inappropriate modifiers to "
296 "format specifier '%c' in printf"),
301 sub_start
= current_substring
;
303 if (lcount
> 1 && USE_PRINTF_I64
)
305 /* Windows' printf does support long long, but not the usual way.
306 Convert %lld to %I64d. */
307 int length_before_ll
= f
- percent_loc
- 1 - lcount
;
309 strncpy (current_substring
, percent_loc
, length_before_ll
);
310 strcpy (current_substring
+ length_before_ll
, "I64");
311 current_substring
[length_before_ll
+ 3] =
312 percent_loc
[length_before_ll
+ lcount
];
313 current_substring
+= length_before_ll
+ 4;
315 else if (this_argclass
== wide_string_arg
316 || this_argclass
== wide_char_arg
)
318 /* Convert %ls or %lc to %s. */
319 int length_before_ls
= f
- percent_loc
- 2;
321 strncpy (current_substring
, percent_loc
, length_before_ls
);
322 strcpy (current_substring
+ length_before_ls
, "s");
323 current_substring
+= length_before_ls
+ 2;
327 strncpy (current_substring
, percent_loc
, f
- percent_loc
);
328 current_substring
+= f
- percent_loc
;
331 *current_substring
++ = '\0';
335 m_pieces
.emplace_back (sub_start
, this_argclass
);
338 /* Record the remainder of the string. */
340 sub_start
= current_substring
;
342 strncpy (current_substring
, prev_start
, f
- prev_start
);
343 current_substring
+= f
- prev_start
;
344 *current_substring
++ = '\0';
346 m_pieces
.emplace_back (sub_start
, literal_piece
);
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