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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; | |
b17992c1 SM |
59 | case 'e': |
60 | *f++ = '\e'; | |
61 | break; | |
d3ce09f5 SS |
62 | case 'f': |
63 | *f++ = '\f'; | |
64 | break; | |
65 | case 'n': | |
66 | *f++ = '\n'; | |
67 | break; | |
68 | case 'r': | |
69 | *f++ = '\r'; | |
70 | break; | |
71 | case 't': | |
72 | *f++ = '\t'; | |
73 | break; | |
74 | case 'v': | |
75 | *f++ = '\v'; | |
76 | break; | |
77 | case '"': | |
78 | *f++ = '"'; | |
79 | break; | |
80 | default: | |
81 | /* ??? TODO: handle other escape sequences. */ | |
82 | error (_("Unrecognized escape character \\%c in format string."), | |
83 | c); | |
84 | } | |
85 | break; | |
86 | ||
87 | default: | |
88 | *f++ = c; | |
89 | } | |
90 | } | |
91 | ||
92 | /* Terminate our escape-processed copy. */ | |
93 | *f++ = '\0'; | |
94 | ||
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. */ | |
97 | *arg = s; | |
98 | ||
99 | /* Need extra space for the '\0's. Doubling the size is sufficient. */ | |
100 | ||
224c3ddb | 101 | current_substring = (char *) xmalloc (strlen (string) * 2 + 1000); |
8e481c3b | 102 | m_storage.reset (current_substring); |
d3ce09f5 SS |
103 | |
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. */ | |
107 | ||
108 | f = string; | |
109 | prev_start = string; | |
110 | while (*f) | |
111 | if (*f++ == '%') | |
112 | { | |
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; | |
117 | int bad = 0; | |
118 | ||
119 | /* Skip over "%%", it will become part of a literal piece. */ | |
120 | if (*f == '%') | |
121 | { | |
122 | f++; | |
123 | continue; | |
124 | } | |
125 | ||
126 | sub_start = current_substring; | |
127 | ||
128 | strncpy (current_substring, prev_start, f - 1 - prev_start); | |
129 | current_substring += f - 1 - prev_start; | |
130 | *current_substring++ = '\0'; | |
131 | ||
8e481c3b | 132 | m_pieces.emplace_back (sub_start, literal_piece); |
d3ce09f5 SS |
133 | |
134 | percent_loc = f - 1; | |
135 | ||
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 | |
139 | we autoconf for). */ | |
140 | ||
141 | /* The first part of a format specifier is a set of flag | |
142 | characters. */ | |
5ea5559b | 143 | while (*f != '\0' && strchr ("0-+ #", *f)) |
d3ce09f5 SS |
144 | { |
145 | if (*f == '#') | |
146 | seen_hash = 1; | |
147 | else if (*f == '0') | |
148 | seen_zero = 1; | |
149 | else if (*f == ' ') | |
150 | seen_space = 1; | |
151 | else if (*f == '+') | |
152 | seen_plus = 1; | |
153 | f++; | |
154 | } | |
155 | ||
156 | /* The next part of a format specifier is a width. */ | |
5ea5559b | 157 | while (*f != '\0' && strchr ("0123456789", *f)) |
d3ce09f5 SS |
158 | f++; |
159 | ||
160 | /* The next part of a format specifier is a precision. */ | |
161 | if (*f == '.') | |
162 | { | |
163 | seen_prec = 1; | |
164 | f++; | |
5ea5559b | 165 | while (*f != '\0' && strchr ("0123456789", *f)) |
d3ce09f5 SS |
166 | f++; |
167 | } | |
168 | ||
169 | /* The next part of a format specifier is a length modifier. */ | |
170 | if (*f == 'h') | |
171 | { | |
172 | seen_h = 1; | |
173 | f++; | |
174 | } | |
175 | else if (*f == 'l') | |
176 | { | |
177 | f++; | |
178 | lcount++; | |
179 | if (*f == 'l') | |
180 | { | |
181 | f++; | |
182 | lcount++; | |
183 | } | |
184 | } | |
185 | else if (*f == 'L') | |
186 | { | |
187 | seen_big_l = 1; | |
188 | f++; | |
189 | } | |
190 | /* Decimal32 modifier. */ | |
191 | else if (*f == 'H') | |
192 | { | |
193 | seen_big_h = 1; | |
194 | f++; | |
195 | } | |
196 | /* Decimal64 and Decimal128 modifiers. */ | |
197 | else if (*f == 'D') | |
198 | { | |
199 | f++; | |
200 | ||
201 | /* Check for a Decimal128. */ | |
202 | if (*f == 'D') | |
203 | { | |
204 | f++; | |
205 | seen_double_big_d = 1; | |
206 | } | |
207 | else | |
208 | seen_big_d = 1; | |
209 | } | |
210 | ||
211 | switch (*f) | |
212 | { | |
213 | case 'u': | |
214 | if (seen_hash) | |
215 | bad = 1; | |
216 | /* FALLTHROUGH */ | |
217 | ||
218 | case 'o': | |
219 | case 'x': | |
220 | case 'X': | |
221 | if (seen_space || seen_plus) | |
222 | bad = 1; | |
223 | /* FALLTHROUGH */ | |
224 | ||
225 | case 'd': | |
226 | case 'i': | |
227 | if (lcount == 0) | |
228 | this_argclass = int_arg; | |
229 | else if (lcount == 1) | |
230 | this_argclass = long_arg; | |
231 | else | |
232 | this_argclass = long_long_arg; | |
4ff3ce77 DE |
233 | |
234 | if (seen_big_l) | |
235 | bad = 1; | |
236 | break; | |
d3ce09f5 SS |
237 | |
238 | case 'c': | |
239 | this_argclass = lcount == 0 ? int_arg : wide_char_arg; | |
240 | if (lcount > 1 || seen_h || seen_big_l) | |
241 | bad = 1; | |
242 | if (seen_prec || seen_zero || seen_space || seen_plus) | |
243 | bad = 1; | |
244 | break; | |
245 | ||
246 | case 'p': | |
247 | this_argclass = ptr_arg; | |
248 | if (lcount || seen_h || seen_big_l) | |
249 | bad = 1; | |
5c30d39a AB |
250 | if (seen_prec) |
251 | bad = 1; | |
252 | if (seen_hash || seen_zero || seen_space || seen_plus) | |
d3ce09f5 SS |
253 | bad = 1; |
254 | break; | |
255 | ||
256 | case 's': | |
257 | this_argclass = lcount == 0 ? string_arg : wide_string_arg; | |
258 | if (lcount > 1 || seen_h || seen_big_l) | |
259 | bad = 1; | |
260 | if (seen_zero || seen_space || seen_plus) | |
261 | bad = 1; | |
262 | break; | |
263 | ||
264 | case 'e': | |
265 | case 'f': | |
266 | case 'g': | |
267 | case 'E': | |
268 | case 'G': | |
16e812b2 UW |
269 | if (seen_double_big_d) |
270 | this_argclass = dec128float_arg; | |
271 | else if (seen_big_d) | |
272 | this_argclass = dec64float_arg; | |
273 | else if (seen_big_h) | |
274 | this_argclass = dec32float_arg; | |
d3ce09f5 SS |
275 | else if (seen_big_l) |
276 | this_argclass = long_double_arg; | |
277 | else | |
278 | this_argclass = double_arg; | |
279 | ||
4ff3ce77 DE |
280 | if (lcount || seen_h) |
281 | bad = 1; | |
282 | break; | |
d3ce09f5 SS |
283 | |
284 | case '*': | |
285 | error (_("`*' not supported for precision or width in printf")); | |
286 | ||
287 | case 'n': | |
288 | error (_("Format specifier `n' not supported in printf")); | |
289 | ||
290 | case '\0': | |
291 | error (_("Incomplete format specifier at end of format string")); | |
292 | ||
293 | default: | |
294 | error (_("Unrecognized format specifier '%c' in printf"), *f); | |
295 | } | |
296 | ||
297 | if (bad) | |
298 | error (_("Inappropriate modifiers to " | |
299 | "format specifier '%c' in printf"), | |
300 | *f); | |
301 | ||
302 | f++; | |
303 | ||
304 | sub_start = current_substring; | |
305 | ||
306 | if (lcount > 1 && USE_PRINTF_I64) | |
307 | { | |
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; | |
311 | ||
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; | |
317 | } | |
318 | else if (this_argclass == wide_string_arg | |
319 | || this_argclass == wide_char_arg) | |
320 | { | |
321 | /* Convert %ls or %lc to %s. */ | |
322 | int length_before_ls = f - percent_loc - 2; | |
323 | ||
324 | strncpy (current_substring, percent_loc, length_before_ls); | |
325 | strcpy (current_substring + length_before_ls, "s"); | |
326 | current_substring += length_before_ls + 2; | |
327 | } | |
328 | else | |
329 | { | |
330 | strncpy (current_substring, percent_loc, f - percent_loc); | |
331 | current_substring += f - percent_loc; | |
332 | } | |
333 | ||
334 | *current_substring++ = '\0'; | |
335 | ||
336 | prev_start = f; | |
337 | ||
8e481c3b | 338 | m_pieces.emplace_back (sub_start, this_argclass); |
d3ce09f5 SS |
339 | } |
340 | ||
341 | /* Record the remainder of the string. */ | |
342 | ||
343 | sub_start = current_substring; | |
344 | ||
345 | strncpy (current_substring, prev_start, f - prev_start); | |
346 | current_substring += f - prev_start; | |
347 | *current_substring++ = '\0'; | |
348 | ||
8e481c3b | 349 | m_pieces.emplace_back (sub_start, literal_piece); |
d3ce09f5 | 350 | } |