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f640bcb3 RK |
1 | /* |
2 | * This file is part of DisOrder | |
3 | * Copyright (C) 2008 Richard Kettlewell | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
18 | * USA | |
19 | */ | |
20 | ||
21 | /** @file lib/macros-builtin.c | |
22 | * @brief Built-in expansions | |
23 | * | |
b36be3a1 RK |
24 | * This is a grab-bag of non-domain-specific expansions. Documentation will be |
25 | * generated from the comments at the head of each function. | |
f640bcb3 RK |
26 | */ |
27 | ||
05b75f8d | 28 | #include "common.h" |
f640bcb3 | 29 | |
f640bcb3 | 30 | #include <errno.h> |
f640bcb3 | 31 | #include <unistd.h> |
b36be3a1 RK |
32 | #include <fcntl.h> |
33 | #include <sys/stat.h> | |
c240ff9a | 34 | #include <sys/wait.h> |
f640bcb3 | 35 | |
9faa7a88 | 36 | #include "hash.h" |
b36be3a1 | 37 | #include "mem.h" |
f640bcb3 RK |
38 | #include "macros.h" |
39 | #include "sink.h" | |
40 | #include "syscalls.h" | |
41 | #include "log.h" | |
42 | #include "wstat.h" | |
43 | #include "kvp.h" | |
b36be3a1 RK |
44 | #include "split.h" |
45 | #include "printf.h" | |
46 | #include "vector.h" | |
2257512d | 47 | #include "filepart.h" |
b36be3a1 RK |
48 | |
49 | static struct vector include_path; | |
f640bcb3 RK |
50 | |
51 | /** @brief Return 1 if @p s is 'true' else 0 */ | |
52 | int mx_str2bool(const char *s) { | |
53 | return !strcmp(s, "true"); | |
54 | } | |
55 | ||
56 | /** @brief Return "true" if @p n is nonzero else "false" */ | |
57 | const char *mx_bool2str(int n) { | |
58 | return n ? "true" : "false"; | |
59 | } | |
60 | ||
b36be3a1 | 61 | /** @brief Write a boolean result */ |
71634563 | 62 | int mx_bool_result(struct sink *output, int result) { |
b36be3a1 RK |
63 | if(sink_writes(output, mx_bool2str(result)) < 0) |
64 | return -1; | |
65 | else | |
66 | return 0; | |
67 | } | |
68 | ||
9faa7a88 | 69 | /** @brief Search the include path */ |
f2d306b4 | 70 | char *mx_find(const char *name, int report) { |
9faa7a88 RK |
71 | char *path; |
72 | int n; | |
73 | ||
74 | if(name[0] == '/') { | |
75 | if(access(name, O_RDONLY) < 0) { | |
f2d306b4 RK |
76 | if(report) |
77 | error(errno, "cannot read %s", name); | |
9faa7a88 RK |
78 | return 0; |
79 | } | |
80 | path = xstrdup(name); | |
81 | } else { | |
82 | /* Search the include path */ | |
83 | for(n = 0; n < include_path.nvec; ++n) { | |
84 | byte_xasprintf(&path, "%s/%s", include_path.vec[n], name); | |
85 | if(access(path, O_RDONLY) == 0) | |
86 | break; | |
87 | } | |
88 | if(n >= include_path.nvec) { | |
f2d306b4 RK |
89 | if(report) |
90 | error(0, "cannot find '%s' in search path", name); | |
9faa7a88 RK |
91 | return 0; |
92 | } | |
93 | } | |
94 | return path; | |
95 | } | |
96 | ||
5c1ae3bc | 97 | /*! @include{TEMPLATE}@ |
b36be3a1 RK |
98 | * |
99 | * Includes TEMPLATE. | |
100 | * | |
101 | * TEMPLATE can be an absolute filename starting with a '/'; only the file with | |
102 | * exactly this name will be included. | |
103 | * | |
104 | * Alternatively it can be a relative filename, not starting with a '/'. In | |
105 | * this case the file will be searched for in the include path. When searching | |
106 | * paths, unreadable files are treated as if they do not exist (rather than | |
107 | * matching then producing an error). | |
f640bcb3 | 108 | * |
b36be3a1 RK |
109 | * If the name chosen ends ".tmpl" then the file will be expanded as a |
110 | * template. Anything else is included byte-for-byte without further | |
111 | * modification. | |
112 | * | |
113 | * Only regular files are allowed (no devices, sockets or name pipes). | |
f640bcb3 RK |
114 | */ |
115 | static int exp_include(int attribute((unused)) nargs, | |
b36be3a1 RK |
116 | char **args, |
117 | struct sink *output, | |
118 | void *u) { | |
9faa7a88 | 119 | const char *path; |
b36be3a1 RK |
120 | int fd, n; |
121 | char buffer[4096]; | |
122 | struct stat sb; | |
b36be3a1 | 123 | |
f2d306b4 | 124 | if(!(path = mx_find(args[0], 1/*report*/))) { |
f5fdc06f | 125 | if(sink_printf(output, "[[cannot find '%s']]", args[0]) < 0) |
dd0f422a | 126 | return 0; |
9faa7a88 | 127 | return 0; |
b36be3a1 RK |
128 | } |
129 | /* If it's a template expand it */ | |
130 | if(strlen(path) >= 5 && !strncmp(path + strlen(path) - 5, ".tmpl", 5)) | |
131 | return mx_expand_file(path, output, u); | |
132 | /* Read the raw file. As with mx_expand_file() we insist that the file is a | |
133 | * regular file. */ | |
134 | if((fd = open(path, O_RDONLY)) < 0) | |
135 | fatal(errno, "error opening %s", path); | |
136 | if(fstat(fd, &sb) < 0) | |
137 | fatal(errno, "error statting %s", path); | |
138 | if(!S_ISREG(sb.st_mode)) | |
139 | fatal(0, "%s: not a regular file", path); | |
140 | while((n = read(fd, buffer, sizeof buffer)) > 0) { | |
141 | if(sink_write(output, buffer, n) < 0) { | |
142 | xclose(fd); | |
143 | return -1; | |
144 | } | |
145 | } | |
146 | if(n < 0) | |
147 | fatal(errno, "error reading %s", path); | |
148 | xclose(fd); | |
149 | return 0; | |
f640bcb3 RK |
150 | } |
151 | ||
5c1ae3bc | 152 | /*! @include{COMMAND}@ |
f640bcb3 RK |
153 | * |
154 | * Executes COMMAND via the shell (using "sh -c") and copies its | |
155 | * standard output to the template output. The shell command output | |
156 | * is not expanded or modified in any other way. | |
157 | * | |
158 | * The shell command's standard error is copied to the error log. | |
159 | * | |
160 | * If the shell exits nonzero then this is reported to the error log | |
161 | * but otherwise no special action is taken. | |
162 | */ | |
163 | static int exp_shell(int attribute((unused)) nargs, | |
164 | char **args, | |
165 | struct sink *output, | |
166 | void attribute((unused)) *u) { | |
167 | int w, p[2], n; | |
168 | char buffer[4096]; | |
169 | pid_t pid; | |
170 | ||
171 | xpipe(p); | |
172 | if(!(pid = xfork())) { | |
173 | exitfn = _exit; | |
174 | xclose(p[0]); | |
175 | xdup2(p[1], 1); | |
176 | xclose(p[1]); | |
177 | execlp("sh", "sh", "-c", args[0], (char *)0); | |
178 | fatal(errno, "error executing sh"); | |
179 | } | |
180 | xclose(p[1]); | |
181 | while((n = read(p[0], buffer, sizeof buffer))) { | |
182 | if(n < 0) { | |
183 | if(errno == EINTR) | |
184 | continue; | |
185 | else | |
186 | fatal(errno, "error reading from pipe"); | |
187 | } | |
188 | if(output->write(output, buffer, n) < 0) | |
189 | return -1; | |
190 | } | |
191 | xclose(p[0]); | |
192 | while((n = waitpid(pid, &w, 0)) < 0 && errno == EINTR) | |
193 | ; | |
194 | if(n < 0) | |
195 | fatal(errno, "error calling waitpid"); | |
196 | if(w) | |
197 | error(0, "shell command '%s' %s", args[0], wstat(w)); | |
198 | return 0; | |
199 | } | |
200 | ||
5c1ae3bc | 201 | /*! @if{CONDITION}{IF-TRUE}{IF-FALSE}@ |
f640bcb3 RK |
202 | * |
203 | * If CONDITION is "true" then evaluates to IF-TRUE. Otherwise | |
204 | * evaluates to IF-FALSE. The IF-FALSE part is optional. | |
205 | */ | |
206 | static int exp_if(int nargs, | |
207 | const struct mx_node **args, | |
208 | struct sink *output, | |
209 | void *u) { | |
210 | char *s; | |
211 | int rc; | |
212 | ||
b36be3a1 | 213 | if((rc = mx_expandstr(args[0], &s, u, "argument #0 (CONDITION)"))) |
f640bcb3 RK |
214 | return rc; |
215 | if(mx_str2bool(s)) | |
216 | return mx_expand(args[1], output, u); | |
217 | else if(nargs > 2) | |
218 | return mx_expand(args[2], output, u); | |
219 | else | |
220 | return 0; | |
221 | } | |
222 | ||
5c1ae3bc | 223 | /*! @and{BRANCH}{BRANCH}...@ |
f640bcb3 RK |
224 | * |
225 | * Expands to "true" if all the branches are "true" otherwise to "false". If | |
226 | * there are no brances then the result is "true". Only as many branches as | |
227 | * necessary to compute the answer are evaluated (starting from the first one), | |
228 | * so if later branches have side effects they may not take place. | |
229 | */ | |
230 | static int exp_and(int nargs, | |
231 | const struct mx_node **args, | |
232 | struct sink *output, | |
233 | void *u) { | |
234 | int n, result = 1, rc; | |
b36be3a1 | 235 | char *s, *argname; |
f640bcb3 RK |
236 | |
237 | for(n = 0; n < nargs; ++n) { | |
b36be3a1 RK |
238 | byte_xasprintf(&argname, "argument #%d", n); |
239 | if((rc = mx_expandstr(args[n], &s, u, argname))) | |
f640bcb3 RK |
240 | return rc; |
241 | if(!mx_str2bool(s)) { | |
242 | result = 0; | |
243 | break; | |
244 | } | |
245 | } | |
b36be3a1 | 246 | return mx_bool_result(output, result); |
f640bcb3 RK |
247 | } |
248 | ||
5c1ae3bc | 249 | /*! @or{BRANCH}{BRANCH}...@ |
f640bcb3 RK |
250 | * |
251 | * Expands to "true" if any of the branches are "true" otherwise to "false". | |
252 | * If there are no brances then the result is "false". Only as many branches | |
253 | * as necessary to compute the answer are evaluated (starting from the first | |
254 | * one), so if later branches have side effects they may not take place. | |
255 | */ | |
256 | static int exp_or(int nargs, | |
257 | const struct mx_node **args, | |
258 | struct sink *output, | |
259 | void *u) { | |
260 | int n, result = 0, rc; | |
b36be3a1 | 261 | char *s, *argname; |
f640bcb3 RK |
262 | |
263 | for(n = 0; n < nargs; ++n) { | |
b36be3a1 RK |
264 | byte_xasprintf(&argname, "argument #%d", n); |
265 | if((rc = mx_expandstr(args[n], &s, u, argname))) | |
f640bcb3 RK |
266 | return rc; |
267 | if(mx_str2bool(s)) { | |
268 | result = 1; | |
269 | break; | |
270 | } | |
271 | } | |
b36be3a1 | 272 | return mx_bool_result(output, result); |
f640bcb3 RK |
273 | } |
274 | ||
5c1ae3bc | 275 | /*! @not{CONDITION}@ |
f640bcb3 RK |
276 | * |
277 | * Expands to "true" unless CONDITION is "true" in which case "false". | |
278 | */ | |
279 | static int exp_not(int attribute((unused)) nargs, | |
280 | char **args, | |
281 | struct sink *output, | |
282 | void attribute((unused)) *u) { | |
b36be3a1 | 283 | return mx_bool_result(output, !mx_str2bool(args[0])); |
f640bcb3 RK |
284 | } |
285 | ||
5c1ae3bc | 286 | /*! @#{...}@ |
f640bcb3 RK |
287 | * |
288 | * Expands to nothing. The argument(s) are not fully evaluated, and no side | |
289 | * effects occur. | |
290 | */ | |
291 | static int exp_comment(int attribute((unused)) nargs, | |
292 | const struct mx_node attribute((unused)) **args, | |
293 | struct sink attribute((unused)) *output, | |
294 | void attribute((unused)) *u) { | |
295 | return 0; | |
296 | } | |
297 | ||
5c1ae3bc | 298 | /*! @urlquote{STRING}@ |
f640bcb3 RK |
299 | * |
300 | * URL-quotes a string, i.e. replaces any characters not safe to use unquoted | |
301 | * in a URL with %-encoded form. | |
302 | */ | |
303 | static int exp_urlquote(int attribute((unused)) nargs, | |
304 | char **args, | |
305 | struct sink *output, | |
306 | void attribute((unused)) *u) { | |
307 | if(sink_writes(output, urlencodestring(args[0])) < 0) | |
308 | return -1; | |
309 | else | |
310 | return 0; | |
311 | } | |
312 | ||
5c1ae3bc | 313 | /*! @eq{S1}{S2}...@ |
b36be3a1 RK |
314 | * |
315 | * Expands to "true" if all the arguments are identical, otherwise to "false" | |
316 | * (i.e. if any pair of arguments differs). | |
317 | * | |
318 | * If there are no arguments then expands to "true". Evaluates all arguments | |
319 | * (with their side effects) even if that's not strictly necessary to discover | |
320 | * the result. | |
321 | */ | |
322 | static int exp_eq(int nargs, | |
323 | char **args, | |
324 | struct sink *output, | |
325 | void attribute((unused)) *u) { | |
326 | int n, result = 1; | |
327 | ||
328 | for(n = 1; n < nargs; ++n) { | |
329 | if(strcmp(args[n], args[0])) { | |
330 | result = 0; | |
331 | break; | |
332 | } | |
333 | } | |
334 | return mx_bool_result(output, result); | |
335 | } | |
336 | ||
5c1ae3bc | 337 | /*! @ne{S1}{S2}...@ |
b36be3a1 RK |
338 | * |
339 | * Expands to "true" if all of the arguments differ from one another, otherwise | |
340 | * to "false" (i.e. if any value appears more than once). | |
341 | * | |
342 | * If there are no arguments then expands to "true". Evaluates all arguments | |
343 | * (with their side effects) even if that's not strictly necessary to discover | |
344 | * the result. | |
345 | */ | |
346 | static int exp_ne(int nargs, | |
347 | char **args, | |
348 | struct sink *output, | |
349 | void attribute((unused))*u) { | |
350 | hash *h = hash_new(sizeof (char *)); | |
351 | int n, result = 1; | |
352 | ||
353 | for(n = 0; n < nargs; ++n) | |
354 | if(hash_add(h, args[n], "", HASH_INSERT)) { | |
355 | result = 0; | |
356 | break; | |
357 | } | |
358 | return mx_bool_result(output, result); | |
359 | } | |
360 | ||
5c1ae3bc | 361 | /*! @discard{...}@ |
b36be3a1 RK |
362 | * |
363 | * Expands to nothing. Unlike the comment expansion @#{...}, side effects of | |
364 | * arguments are not suppressed. So this can be used to surround a collection | |
365 | * of macro definitions with whitespace, free text commentary, etc. | |
366 | */ | |
367 | static int exp_discard(int attribute((unused)) nargs, | |
368 | char attribute((unused)) **args, | |
369 | struct sink attribute((unused)) *output, | |
370 | void attribute((unused)) *u) { | |
371 | return 0; | |
372 | } | |
373 | ||
5c1ae3bc | 374 | /*! @define{NAME}{ARG1 ARG2...}{DEFINITION}@ |
b36be3a1 RK |
375 | * |
376 | * Define a macro. The macro will be called NAME and will act like an | |
377 | * expansion. When it is expanded, the expansion is replaced by DEFINITION, | |
378 | * with each occurence of @ARG1@ etc replaced by the parameters to the | |
379 | * expansion. | |
380 | */ | |
381 | static int exp_define(int attribute((unused)) nargs, | |
382 | const struct mx_node **args, | |
383 | struct sink attribute((unused)) *output, | |
384 | void attribute((unused)) *u) { | |
385 | char **as, *name, *argnames; | |
386 | int rc, nas; | |
387 | ||
388 | if((rc = mx_expandstr(args[0], &name, u, "argument #0 (NAME)"))) | |
389 | return rc; | |
390 | if((rc = mx_expandstr(args[1], &argnames, u, "argument #1 (ARGS)"))) | |
391 | return rc; | |
392 | as = split(argnames, &nas, 0, 0, 0); | |
393 | mx_register_macro(name, nas, as, args[2]); | |
394 | return 0; | |
395 | } | |
396 | ||
5c1ae3bc | 397 | /*! @basename{PATH} |
2257512d RK |
398 | * |
399 | * Expands to the UNQUOTED basename of PATH. | |
400 | */ | |
401 | static int exp_basename(int attribute((unused)) nargs, | |
402 | char **args, | |
403 | struct sink attribute((unused)) *output, | |
404 | void attribute((unused)) *u) { | |
405 | return sink_writes(output, d_basename(args[0])) < 0 ? -1 : 0; | |
406 | } | |
407 | ||
5c1ae3bc | 408 | /*! @dirname{PATH} |
2257512d RK |
409 | * |
410 | * Expands to the UNQUOTED directory name of PATH. | |
411 | */ | |
412 | static int exp_dirname(int attribute((unused)) nargs, | |
413 | char **args, | |
414 | struct sink attribute((unused)) *output, | |
415 | void attribute((unused)) *u) { | |
416 | return sink_writes(output, d_dirname(args[0])) < 0 ? -1 : 0; | |
417 | } | |
418 | ||
5c1ae3bc | 419 | /*! @q{STRING} |
721d8bf4 RK |
420 | * |
421 | * Expands to STRING. | |
422 | */ | |
423 | static int exp_q(int attribute((unused)) nargs, | |
424 | char **args, | |
425 | struct sink attribute((unused)) *output, | |
426 | void attribute((unused)) *u) { | |
427 | return sink_writes(output, args[0]) < 0 ? -1 : 0; | |
428 | } | |
429 | ||
dd0f422a | 430 | /** @brief Register built-in expansions */ |
f640bcb3 | 431 | void mx_register_builtin(void) { |
2257512d RK |
432 | mx_register("basename", 1, 1, exp_basename); |
433 | mx_register("dirname", 1, 1, exp_dirname); | |
b36be3a1 RK |
434 | mx_register("discard", 0, INT_MAX, exp_discard); |
435 | mx_register("eq", 0, INT_MAX, exp_eq); | |
f640bcb3 | 436 | mx_register("include", 1, 1, exp_include); |
b36be3a1 | 437 | mx_register("ne", 0, INT_MAX, exp_ne); |
f640bcb3 | 438 | mx_register("not", 1, 1, exp_not); |
b36be3a1 | 439 | mx_register("shell", 1, 1, exp_shell); |
f640bcb3 | 440 | mx_register("urlquote", 1, 1, exp_urlquote); |
721d8bf4 | 441 | mx_register("q", 1, 1, exp_q); |
2257512d RK |
442 | mx_register_magic("#", 0, INT_MAX, exp_comment); |
443 | mx_register_magic("and", 0, INT_MAX, exp_and); | |
444 | mx_register_magic("define", 3, 3, exp_define); | |
445 | mx_register_magic("if", 2, 3, exp_if); | |
446 | mx_register_magic("or", 0, INT_MAX, exp_or); | |
f640bcb3 RK |
447 | } |
448 | ||
dd0f422a RK |
449 | /** @brief Add a directory to the search path |
450 | * @param s Directory to add | |
451 | */ | |
452 | void mx_search_path(const char *s) { | |
453 | vector_append(&include_path, xstrdup(s)); | |
454 | } | |
455 | ||
f640bcb3 RK |
456 | /* |
457 | Local Variables: | |
458 | c-basic-offset:2 | |
459 | comment-column:40 | |
460 | fill-column:79 | |
461 | indent-tabs-mode:nil | |
462 | End: | |
463 | */ |