1 /* Parse a printf-style format string.
3 Copyright (C) 1986-2019 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')
81 /* ??? TODO: handle other escape sequences. */
82 error (_("Unrecognized escape character \\%c in format string."),
92 /* Terminate our escape-processed copy. */
95 /* Whether the format string ended with double-quote or zero, we're
96 done with it; it's up to callers to complain about syntax. */
99 /* Need extra space for the '\0's. Doubling the size is sufficient. */
101 current_substring
= (char *) xmalloc (strlen (string
) * 2 + 1000);
102 m_storage
.reset (current_substring
);
104 /* Now scan the string for %-specs and see what kinds of args they want.
105 argclass classifies the %-specs so we can give printf-type functions
106 something of the right size. */
113 int seen_hash
= 0, seen_zero
= 0, lcount
= 0, seen_prec
= 0;
114 int seen_space
= 0, seen_plus
= 0;
115 int seen_big_l
= 0, seen_h
= 0, seen_big_h
= 0;
116 int seen_big_d
= 0, seen_double_big_d
= 0;
119 /* Skip over "%%", it will become part of a literal piece. */
126 sub_start
= current_substring
;
128 strncpy (current_substring
, prev_start
, f
- 1 - prev_start
);
129 current_substring
+= f
- 1 - prev_start
;
130 *current_substring
++ = '\0';
132 m_pieces
.emplace_back (sub_start
, literal_piece
);
136 /* Check the validity of the format specifier, and work
137 out what argument it expects. We only accept C89
138 format strings, with the exception of long long (which
141 /* The first part of a format specifier is a set of flag
143 while (*f
!= '\0' && strchr ("0-+ #", *f
))
156 /* The next part of a format specifier is a width. */
157 while (*f
!= '\0' && strchr ("0123456789", *f
))
160 /* The next part of a format specifier is a precision. */
165 while (*f
!= '\0' && strchr ("0123456789", *f
))
169 /* The next part of a format specifier is a length modifier. */
190 /* Decimal32 modifier. */
196 /* Decimal64 and Decimal128 modifiers. */
201 /* Check for a Decimal128. */
205 seen_double_big_d
= 1;
221 if (seen_space
|| seen_plus
)
228 this_argclass
= int_arg
;
229 else if (lcount
== 1)
230 this_argclass
= long_arg
;
232 this_argclass
= long_long_arg
;
239 this_argclass
= lcount
== 0 ? int_arg
: wide_char_arg
;
240 if (lcount
> 1 || seen_h
|| seen_big_l
)
242 if (seen_prec
|| seen_zero
|| seen_space
|| seen_plus
)
247 this_argclass
= ptr_arg
;
248 if (lcount
|| seen_h
|| seen_big_l
)
252 if (seen_hash
|| seen_zero
|| seen_space
|| seen_plus
)
257 this_argclass
= lcount
== 0 ? string_arg
: wide_string_arg
;
258 if (lcount
> 1 || seen_h
|| seen_big_l
)
260 if (seen_zero
|| seen_space
|| seen_plus
)
269 if (seen_double_big_d
)
270 this_argclass
= dec128float_arg
;
272 this_argclass
= dec64float_arg
;
274 this_argclass
= dec32float_arg
;
276 this_argclass
= long_double_arg
;
278 this_argclass
= double_arg
;
280 if (lcount
|| seen_h
)
285 error (_("`*' not supported for precision or width in printf"));
288 error (_("Format specifier `n' not supported in printf"));
291 error (_("Incomplete format specifier at end of format string"));
294 error (_("Unrecognized format specifier '%c' in printf"), *f
);
298 error (_("Inappropriate modifiers to "
299 "format specifier '%c' in printf"),
304 sub_start
= current_substring
;
306 if (lcount
> 1 && USE_PRINTF_I64
)
308 /* Windows' printf does support long long, but not the usual way.
309 Convert %lld to %I64d. */
310 int length_before_ll
= f
- percent_loc
- 1 - lcount
;
312 strncpy (current_substring
, percent_loc
, length_before_ll
);
313 strcpy (current_substring
+ length_before_ll
, "I64");
314 current_substring
[length_before_ll
+ 3] =
315 percent_loc
[length_before_ll
+ lcount
];
316 current_substring
+= length_before_ll
+ 4;
318 else if (this_argclass
== wide_string_arg
319 || this_argclass
== wide_char_arg
)
321 /* Convert %ls or %lc to %s. */
322 int length_before_ls
= f
- percent_loc
- 2;
324 strncpy (current_substring
, percent_loc
, length_before_ls
);
325 strcpy (current_substring
+ length_before_ls
, "s");
326 current_substring
+= length_before_ls
+ 2;
330 strncpy (current_substring
, percent_loc
, f
- percent_loc
);
331 current_substring
+= f
- percent_loc
;
334 *current_substring
++ = '\0';
338 m_pieces
.emplace_back (sub_start
, this_argclass
);
341 /* Record the remainder of the string. */
343 sub_start
= current_substring
;
345 strncpy (current_substring
, prev_start
, f
- prev_start
);
346 current_substring
+= f
- prev_start
;
347 *current_substring
++ = '\0';
349 m_pieces
.emplace_back (sub_start
, literal_piece
);
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