Commit | Line | Data |
---|---|---|
d3ce09f5 SS |
1 | /* Parse a printf-style format string. |
2 | ||
e2882c85 | 3 | Copyright (C) 1986-2018 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 | ||
8e481c3b | 23 | format_pieces::format_pieces (const char **arg) |
d3ce09f5 | 24 | { |
bbc13ae3 KS |
25 | const char *s; |
26 | char *f, *string; | |
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 | ||
34 | /* Parse the format-control string and copy it into the string STRING, | |
35 | processing some kinds of escape sequence. */ | |
36 | ||
37 | f = string = (char *) alloca (strlen (s) + 1); | |
38 | ||
39 | while (*s != '"' && *s != '\0') | |
40 | { | |
41 | int c = *s++; | |
42 | switch (c) | |
43 | { | |
44 | case '\0': | |
45 | continue; | |
46 | ||
47 | case '\\': | |
48 | switch (c = *s++) | |
49 | { | |
50 | case '\\': | |
51 | *f++ = '\\'; | |
52 | break; | |
53 | case 'a': | |
54 | *f++ = '\a'; | |
55 | break; | |
56 | case 'b': | |
57 | *f++ = '\b'; | |
58 | break; | |
59 | case 'f': | |
60 | *f++ = '\f'; | |
61 | break; | |
62 | case 'n': | |
63 | *f++ = '\n'; | |
64 | break; | |
65 | case 'r': | |
66 | *f++ = '\r'; | |
67 | break; | |
68 | case 't': | |
69 | *f++ = '\t'; | |
70 | break; | |
71 | case 'v': | |
72 | *f++ = '\v'; | |
73 | break; | |
74 | case '"': | |
75 | *f++ = '"'; | |
76 | break; | |
77 | default: | |
78 | /* ??? TODO: handle other escape sequences. */ | |
79 | error (_("Unrecognized escape character \\%c in format string."), | |
80 | c); | |
81 | } | |
82 | break; | |
83 | ||
84 | default: | |
85 | *f++ = c; | |
86 | } | |
87 | } | |
88 | ||
89 | /* Terminate our escape-processed copy. */ | |
90 | *f++ = '\0'; | |
91 | ||
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. */ | |
94 | *arg = s; | |
95 | ||
96 | /* Need extra space for the '\0's. Doubling the size is sufficient. */ | |
97 | ||
224c3ddb | 98 | current_substring = (char *) xmalloc (strlen (string) * 2 + 1000); |
8e481c3b | 99 | m_storage.reset (current_substring); |
d3ce09f5 SS |
100 | |
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. */ | |
104 | ||
105 | f = string; | |
106 | prev_start = string; | |
107 | while (*f) | |
108 | if (*f++ == '%') | |
109 | { | |
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; | |
114 | int bad = 0; | |
115 | ||
116 | /* Skip over "%%", it will become part of a literal piece. */ | |
117 | if (*f == '%') | |
118 | { | |
119 | f++; | |
120 | continue; | |
121 | } | |
122 | ||
123 | sub_start = current_substring; | |
124 | ||
125 | strncpy (current_substring, prev_start, f - 1 - prev_start); | |
126 | current_substring += f - 1 - prev_start; | |
127 | *current_substring++ = '\0'; | |
128 | ||
8e481c3b | 129 | m_pieces.emplace_back (sub_start, literal_piece); |
d3ce09f5 SS |
130 | |
131 | percent_loc = f - 1; | |
132 | ||
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 | |
136 | we autoconf for). */ | |
137 | ||
138 | /* The first part of a format specifier is a set of flag | |
139 | characters. */ | |
5ea5559b | 140 | while (*f != '\0' && strchr ("0-+ #", *f)) |
d3ce09f5 SS |
141 | { |
142 | if (*f == '#') | |
143 | seen_hash = 1; | |
144 | else if (*f == '0') | |
145 | seen_zero = 1; | |
146 | else if (*f == ' ') | |
147 | seen_space = 1; | |
148 | else if (*f == '+') | |
149 | seen_plus = 1; | |
150 | f++; | |
151 | } | |
152 | ||
153 | /* The next part of a format specifier is a width. */ | |
5ea5559b | 154 | while (*f != '\0' && strchr ("0123456789", *f)) |
d3ce09f5 SS |
155 | f++; |
156 | ||
157 | /* The next part of a format specifier is a precision. */ | |
158 | if (*f == '.') | |
159 | { | |
160 | seen_prec = 1; | |
161 | f++; | |
5ea5559b | 162 | while (*f != '\0' && strchr ("0123456789", *f)) |
d3ce09f5 SS |
163 | f++; |
164 | } | |
165 | ||
166 | /* The next part of a format specifier is a length modifier. */ | |
167 | if (*f == 'h') | |
168 | { | |
169 | seen_h = 1; | |
170 | f++; | |
171 | } | |
172 | else if (*f == 'l') | |
173 | { | |
174 | f++; | |
175 | lcount++; | |
176 | if (*f == 'l') | |
177 | { | |
178 | f++; | |
179 | lcount++; | |
180 | } | |
181 | } | |
182 | else if (*f == 'L') | |
183 | { | |
184 | seen_big_l = 1; | |
185 | f++; | |
186 | } | |
187 | /* Decimal32 modifier. */ | |
188 | else if (*f == 'H') | |
189 | { | |
190 | seen_big_h = 1; | |
191 | f++; | |
192 | } | |
193 | /* Decimal64 and Decimal128 modifiers. */ | |
194 | else if (*f == 'D') | |
195 | { | |
196 | f++; | |
197 | ||
198 | /* Check for a Decimal128. */ | |
199 | if (*f == 'D') | |
200 | { | |
201 | f++; | |
202 | seen_double_big_d = 1; | |
203 | } | |
204 | else | |
205 | seen_big_d = 1; | |
206 | } | |
207 | ||
208 | switch (*f) | |
209 | { | |
210 | case 'u': | |
211 | if (seen_hash) | |
212 | bad = 1; | |
213 | /* FALLTHROUGH */ | |
214 | ||
215 | case 'o': | |
216 | case 'x': | |
217 | case 'X': | |
218 | if (seen_space || seen_plus) | |
219 | bad = 1; | |
220 | /* FALLTHROUGH */ | |
221 | ||
222 | case 'd': | |
223 | case 'i': | |
224 | if (lcount == 0) | |
225 | this_argclass = int_arg; | |
226 | else if (lcount == 1) | |
227 | this_argclass = long_arg; | |
228 | else | |
229 | this_argclass = long_long_arg; | |
4ff3ce77 DE |
230 | |
231 | if (seen_big_l) | |
232 | bad = 1; | |
233 | break; | |
d3ce09f5 SS |
234 | |
235 | case 'c': | |
236 | this_argclass = lcount == 0 ? int_arg : wide_char_arg; | |
237 | if (lcount > 1 || seen_h || seen_big_l) | |
238 | bad = 1; | |
239 | if (seen_prec || seen_zero || seen_space || seen_plus) | |
240 | bad = 1; | |
241 | break; | |
242 | ||
243 | case 'p': | |
244 | this_argclass = ptr_arg; | |
245 | if (lcount || seen_h || seen_big_l) | |
246 | bad = 1; | |
5c30d39a AB |
247 | if (seen_prec) |
248 | bad = 1; | |
249 | if (seen_hash || seen_zero || seen_space || seen_plus) | |
d3ce09f5 SS |
250 | bad = 1; |
251 | break; | |
252 | ||
253 | case 's': | |
254 | this_argclass = lcount == 0 ? string_arg : wide_string_arg; | |
255 | if (lcount > 1 || seen_h || seen_big_l) | |
256 | bad = 1; | |
257 | if (seen_zero || seen_space || seen_plus) | |
258 | bad = 1; | |
259 | break; | |
260 | ||
261 | case 'e': | |
262 | case 'f': | |
263 | case 'g': | |
264 | case 'E': | |
265 | case 'G': | |
16e812b2 UW |
266 | if (seen_double_big_d) |
267 | this_argclass = dec128float_arg; | |
268 | else if (seen_big_d) | |
269 | this_argclass = dec64float_arg; | |
270 | else if (seen_big_h) | |
271 | this_argclass = dec32float_arg; | |
d3ce09f5 SS |
272 | else if (seen_big_l) |
273 | this_argclass = long_double_arg; | |
274 | else | |
275 | this_argclass = double_arg; | |
276 | ||
4ff3ce77 DE |
277 | if (lcount || seen_h) |
278 | bad = 1; | |
279 | break; | |
d3ce09f5 SS |
280 | |
281 | case '*': | |
282 | error (_("`*' not supported for precision or width in printf")); | |
283 | ||
284 | case 'n': | |
285 | error (_("Format specifier `n' not supported in printf")); | |
286 | ||
287 | case '\0': | |
288 | error (_("Incomplete format specifier at end of format string")); | |
289 | ||
290 | default: | |
291 | error (_("Unrecognized format specifier '%c' in printf"), *f); | |
292 | } | |
293 | ||
294 | if (bad) | |
295 | error (_("Inappropriate modifiers to " | |
296 | "format specifier '%c' in printf"), | |
297 | *f); | |
298 | ||
299 | f++; | |
300 | ||
301 | sub_start = current_substring; | |
302 | ||
303 | if (lcount > 1 && USE_PRINTF_I64) | |
304 | { | |
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; | |
308 | ||
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; | |
314 | } | |
315 | else if (this_argclass == wide_string_arg | |
316 | || this_argclass == wide_char_arg) | |
317 | { | |
318 | /* Convert %ls or %lc to %s. */ | |
319 | int length_before_ls = f - percent_loc - 2; | |
320 | ||
321 | strncpy (current_substring, percent_loc, length_before_ls); | |
322 | strcpy (current_substring + length_before_ls, "s"); | |
323 | current_substring += length_before_ls + 2; | |
324 | } | |
325 | else | |
326 | { | |
327 | strncpy (current_substring, percent_loc, f - percent_loc); | |
328 | current_substring += f - percent_loc; | |
329 | } | |
330 | ||
331 | *current_substring++ = '\0'; | |
332 | ||
333 | prev_start = f; | |
334 | ||
8e481c3b | 335 | m_pieces.emplace_back (sub_start, this_argclass); |
d3ce09f5 SS |
336 | } |
337 | ||
338 | /* Record the remainder of the string. */ | |
339 | ||
340 | sub_start = current_substring; | |
341 | ||
342 | strncpy (current_substring, prev_start, f - prev_start); | |
343 | current_substring += f - prev_start; | |
344 | *current_substring++ = '\0'; | |
345 | ||
8e481c3b | 346 | m_pieces.emplace_back (sub_start, literal_piece); |
d3ce09f5 | 347 | } |