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d3ce09f5 SS |
1 | /* Parse a printf-style format string. |
2 | ||
42a4f53d | 3 | Copyright (C) 1986-2019 Free Software Foundation, Inc. |
d3ce09f5 SS |
4 | |
5 | This file is part of GDB. | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
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/>. */ | |
19 | ||
727605ca | 20 | #include "common-defs.h" |
d3ce09f5 SS |
21 | #include "format.h" |
22 | ||
2a3c1174 | 23 | format_pieces::format_pieces (const char **arg, bool gdb_extensions) |
d3ce09f5 | 24 | { |
bbc13ae3 | 25 | const char *s; |
2a3c1174 | 26 | const char *string; |
bbc13ae3 KS |
27 | const char *prev_start; |
28 | const char *percent_loc; | |
d3ce09f5 | 29 | char *sub_start, *current_substring; |
d3ce09f5 SS |
30 | enum argclass this_argclass; |
31 | ||
32 | s = *arg; | |
33 | ||
2a3c1174 PA |
34 | if (gdb_extensions) |
35 | { | |
36 | string = *arg; | |
37 | *arg += strlen (*arg); | |
38 | } | |
39 | else | |
40 | { | |
41 | /* Parse the format-control string and copy it into the string STRING, | |
42 | processing some kinds of escape sequence. */ | |
d3ce09f5 | 43 | |
2a3c1174 PA |
44 | char *f = (char *) alloca (strlen (s) + 1); |
45 | string = f; | |
d3ce09f5 | 46 | |
2a3c1174 | 47 | while ((gdb_extensions || *s != '"') && *s != '\0') |
d3ce09f5 | 48 | { |
2a3c1174 PA |
49 | int c = *s++; |
50 | switch (c) | |
d3ce09f5 | 51 | { |
2a3c1174 PA |
52 | case '\0': |
53 | continue; | |
54 | ||
d3ce09f5 | 55 | case '\\': |
2a3c1174 PA |
56 | switch (c = *s++) |
57 | { | |
58 | case '\\': | |
59 | *f++ = '\\'; | |
60 | break; | |
61 | case 'a': | |
62 | *f++ = '\a'; | |
63 | break; | |
64 | case 'b': | |
65 | *f++ = '\b'; | |
66 | break; | |
67 | case 'e': | |
68 | *f++ = '\e'; | |
69 | break; | |
70 | case 'f': | |
71 | *f++ = '\f'; | |
72 | break; | |
73 | case 'n': | |
74 | *f++ = '\n'; | |
75 | break; | |
76 | case 'r': | |
77 | *f++ = '\r'; | |
78 | break; | |
79 | case 't': | |
80 | *f++ = '\t'; | |
81 | break; | |
82 | case 'v': | |
83 | *f++ = '\v'; | |
84 | break; | |
85 | case '"': | |
86 | *f++ = '"'; | |
87 | break; | |
88 | default: | |
89 | /* ??? TODO: handle other escape sequences. */ | |
90 | error (_("Unrecognized escape character \\%c in format string."), | |
91 | c); | |
92 | } | |
d3ce09f5 | 93 | break; |
2a3c1174 | 94 | |
d3ce09f5 | 95 | default: |
2a3c1174 | 96 | *f++ = c; |
d3ce09f5 | 97 | } |
d3ce09f5 | 98 | } |
d3ce09f5 | 99 | |
2a3c1174 PA |
100 | /* Terminate our escape-processed copy. */ |
101 | *f++ = '\0'; | |
d3ce09f5 | 102 | |
2a3c1174 PA |
103 | /* Whether the format string ended with double-quote or zero, we're |
104 | done with it; it's up to callers to complain about syntax. */ | |
105 | *arg = s; | |
106 | } | |
d3ce09f5 SS |
107 | |
108 | /* Need extra space for the '\0's. Doubling the size is sufficient. */ | |
109 | ||
224c3ddb | 110 | current_substring = (char *) xmalloc (strlen (string) * 2 + 1000); |
8e481c3b | 111 | m_storage.reset (current_substring); |
d3ce09f5 SS |
112 | |
113 | /* Now scan the string for %-specs and see what kinds of args they want. | |
114 | argclass classifies the %-specs so we can give printf-type functions | |
115 | something of the right size. */ | |
116 | ||
2a3c1174 | 117 | const char *f = string; |
d3ce09f5 SS |
118 | prev_start = string; |
119 | while (*f) | |
120 | if (*f++ == '%') | |
121 | { | |
122 | int seen_hash = 0, seen_zero = 0, lcount = 0, seen_prec = 0; | |
123 | int seen_space = 0, seen_plus = 0; | |
124 | int seen_big_l = 0, seen_h = 0, seen_big_h = 0; | |
125 | int seen_big_d = 0, seen_double_big_d = 0; | |
e06f3d6e | 126 | int seen_size_t = 0; |
d3ce09f5 | 127 | int bad = 0; |
2a3c1174 | 128 | int n_int_args = 0; |
d3ce09f5 SS |
129 | |
130 | /* Skip over "%%", it will become part of a literal piece. */ | |
131 | if (*f == '%') | |
132 | { | |
133 | f++; | |
134 | continue; | |
135 | } | |
136 | ||
137 | sub_start = current_substring; | |
138 | ||
139 | strncpy (current_substring, prev_start, f - 1 - prev_start); | |
140 | current_substring += f - 1 - prev_start; | |
141 | *current_substring++ = '\0'; | |
142 | ||
0dfe5bfb | 143 | if (*sub_start != '\0') |
2a3c1174 | 144 | m_pieces.emplace_back (sub_start, literal_piece, 0); |
d3ce09f5 SS |
145 | |
146 | percent_loc = f - 1; | |
147 | ||
148 | /* Check the validity of the format specifier, and work | |
149 | out what argument it expects. We only accept C89 | |
150 | format strings, with the exception of long long (which | |
151 | we autoconf for). */ | |
152 | ||
153 | /* The first part of a format specifier is a set of flag | |
154 | characters. */ | |
5ea5559b | 155 | while (*f != '\0' && strchr ("0-+ #", *f)) |
d3ce09f5 SS |
156 | { |
157 | if (*f == '#') | |
158 | seen_hash = 1; | |
159 | else if (*f == '0') | |
160 | seen_zero = 1; | |
161 | else if (*f == ' ') | |
162 | seen_space = 1; | |
163 | else if (*f == '+') | |
164 | seen_plus = 1; | |
165 | f++; | |
166 | } | |
167 | ||
168 | /* The next part of a format specifier is a width. */ | |
2a3c1174 PA |
169 | if (gdb_extensions && *f == '*') |
170 | { | |
171 | ++f; | |
172 | ++n_int_args; | |
173 | } | |
174 | else | |
175 | { | |
176 | while (*f != '\0' && strchr ("0123456789", *f)) | |
177 | f++; | |
178 | } | |
d3ce09f5 SS |
179 | |
180 | /* The next part of a format specifier is a precision. */ | |
181 | if (*f == '.') | |
182 | { | |
183 | seen_prec = 1; | |
184 | f++; | |
2a3c1174 PA |
185 | if (gdb_extensions && *f == '*') |
186 | { | |
187 | ++f; | |
188 | ++n_int_args; | |
189 | } | |
190 | else | |
191 | { | |
192 | while (*f != '\0' && strchr ("0123456789", *f)) | |
193 | f++; | |
194 | } | |
d3ce09f5 SS |
195 | } |
196 | ||
197 | /* The next part of a format specifier is a length modifier. */ | |
198 | if (*f == 'h') | |
199 | { | |
200 | seen_h = 1; | |
201 | f++; | |
202 | } | |
203 | else if (*f == 'l') | |
204 | { | |
205 | f++; | |
206 | lcount++; | |
207 | if (*f == 'l') | |
208 | { | |
209 | f++; | |
210 | lcount++; | |
211 | } | |
212 | } | |
213 | else if (*f == 'L') | |
214 | { | |
215 | seen_big_l = 1; | |
216 | f++; | |
217 | } | |
218 | /* Decimal32 modifier. */ | |
219 | else if (*f == 'H') | |
220 | { | |
221 | seen_big_h = 1; | |
222 | f++; | |
223 | } | |
224 | /* Decimal64 and Decimal128 modifiers. */ | |
225 | else if (*f == 'D') | |
226 | { | |
227 | f++; | |
228 | ||
229 | /* Check for a Decimal128. */ | |
230 | if (*f == 'D') | |
231 | { | |
232 | f++; | |
233 | seen_double_big_d = 1; | |
234 | } | |
235 | else | |
236 | seen_big_d = 1; | |
237 | } | |
e06f3d6e AB |
238 | /* For size_t or ssize_t. */ |
239 | else if (*f == 'z') | |
240 | { | |
241 | seen_size_t = 1; | |
242 | f++; | |
243 | } | |
d3ce09f5 SS |
244 | |
245 | switch (*f) | |
246 | { | |
247 | case 'u': | |
248 | if (seen_hash) | |
249 | bad = 1; | |
250 | /* FALLTHROUGH */ | |
251 | ||
252 | case 'o': | |
253 | case 'x': | |
254 | case 'X': | |
255 | if (seen_space || seen_plus) | |
256 | bad = 1; | |
257 | /* FALLTHROUGH */ | |
258 | ||
259 | case 'd': | |
260 | case 'i': | |
e06f3d6e AB |
261 | if (seen_size_t) |
262 | this_argclass = size_t_arg; | |
263 | else if (lcount == 0) | |
d3ce09f5 SS |
264 | this_argclass = int_arg; |
265 | else if (lcount == 1) | |
266 | this_argclass = long_arg; | |
267 | else | |
268 | this_argclass = long_long_arg; | |
4ff3ce77 DE |
269 | |
270 | if (seen_big_l) | |
271 | bad = 1; | |
272 | break; | |
d3ce09f5 SS |
273 | |
274 | case 'c': | |
275 | this_argclass = lcount == 0 ? int_arg : wide_char_arg; | |
276 | if (lcount > 1 || seen_h || seen_big_l) | |
277 | bad = 1; | |
278 | if (seen_prec || seen_zero || seen_space || seen_plus) | |
279 | bad = 1; | |
280 | break; | |
281 | ||
282 | case 'p': | |
283 | this_argclass = ptr_arg; | |
284 | if (lcount || seen_h || seen_big_l) | |
285 | bad = 1; | |
5c30d39a AB |
286 | if (seen_prec) |
287 | bad = 1; | |
288 | if (seen_hash || seen_zero || seen_space || seen_plus) | |
d3ce09f5 | 289 | bad = 1; |
2a3c1174 PA |
290 | |
291 | if (gdb_extensions) | |
292 | { | |
293 | switch (f[1]) | |
294 | { | |
295 | case 's': | |
296 | case 'F': | |
297 | case '[': | |
298 | case ']': | |
299 | f++; | |
300 | break; | |
301 | } | |
302 | } | |
303 | ||
d3ce09f5 SS |
304 | break; |
305 | ||
306 | case 's': | |
307 | this_argclass = lcount == 0 ? string_arg : wide_string_arg; | |
308 | if (lcount > 1 || seen_h || seen_big_l) | |
309 | bad = 1; | |
310 | if (seen_zero || seen_space || seen_plus) | |
311 | bad = 1; | |
312 | break; | |
313 | ||
314 | case 'e': | |
315 | case 'f': | |
316 | case 'g': | |
317 | case 'E': | |
318 | case 'G': | |
16e812b2 UW |
319 | if (seen_double_big_d) |
320 | this_argclass = dec128float_arg; | |
321 | else if (seen_big_d) | |
322 | this_argclass = dec64float_arg; | |
323 | else if (seen_big_h) | |
324 | this_argclass = dec32float_arg; | |
d3ce09f5 SS |
325 | else if (seen_big_l) |
326 | this_argclass = long_double_arg; | |
327 | else | |
328 | this_argclass = double_arg; | |
329 | ||
4ff3ce77 DE |
330 | if (lcount || seen_h) |
331 | bad = 1; | |
332 | break; | |
d3ce09f5 SS |
333 | |
334 | case '*': | |
335 | error (_("`*' not supported for precision or width in printf")); | |
336 | ||
337 | case 'n': | |
338 | error (_("Format specifier `n' not supported in printf")); | |
339 | ||
340 | case '\0': | |
341 | error (_("Incomplete format specifier at end of format string")); | |
342 | ||
343 | default: | |
344 | error (_("Unrecognized format specifier '%c' in printf"), *f); | |
345 | } | |
346 | ||
347 | if (bad) | |
348 | error (_("Inappropriate modifiers to " | |
349 | "format specifier '%c' in printf"), | |
350 | *f); | |
351 | ||
352 | f++; | |
353 | ||
354 | sub_start = current_substring; | |
355 | ||
356 | if (lcount > 1 && USE_PRINTF_I64) | |
357 | { | |
358 | /* Windows' printf does support long long, but not the usual way. | |
359 | Convert %lld to %I64d. */ | |
360 | int length_before_ll = f - percent_loc - 1 - lcount; | |
361 | ||
362 | strncpy (current_substring, percent_loc, length_before_ll); | |
363 | strcpy (current_substring + length_before_ll, "I64"); | |
364 | current_substring[length_before_ll + 3] = | |
365 | percent_loc[length_before_ll + lcount]; | |
366 | current_substring += length_before_ll + 4; | |
367 | } | |
368 | else if (this_argclass == wide_string_arg | |
369 | || this_argclass == wide_char_arg) | |
370 | { | |
371 | /* Convert %ls or %lc to %s. */ | |
372 | int length_before_ls = f - percent_loc - 2; | |
373 | ||
374 | strncpy (current_substring, percent_loc, length_before_ls); | |
375 | strcpy (current_substring + length_before_ls, "s"); | |
376 | current_substring += length_before_ls + 2; | |
377 | } | |
378 | else | |
379 | { | |
380 | strncpy (current_substring, percent_loc, f - percent_loc); | |
381 | current_substring += f - percent_loc; | |
382 | } | |
383 | ||
384 | *current_substring++ = '\0'; | |
385 | ||
386 | prev_start = f; | |
387 | ||
2a3c1174 | 388 | m_pieces.emplace_back (sub_start, this_argclass, n_int_args); |
d3ce09f5 SS |
389 | } |
390 | ||
391 | /* Record the remainder of the string. */ | |
392 | ||
0dfe5bfb TT |
393 | if (f > prev_start) |
394 | { | |
395 | sub_start = current_substring; | |
d3ce09f5 | 396 | |
0dfe5bfb TT |
397 | strncpy (current_substring, prev_start, f - prev_start); |
398 | current_substring += f - prev_start; | |
399 | *current_substring++ = '\0'; | |
d3ce09f5 | 400 | |
2a3c1174 | 401 | m_pieces.emplace_back (sub_start, literal_piece, 0); |
0dfe5bfb | 402 | } |
d3ce09f5 | 403 | } |