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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 | ||
28 | #include <config.h> | |
29 | #include "types.h" | |
30 | ||
31 | #include <stdio.h> | |
32 | #include <string.h> | |
33 | #include <errno.h> | |
34 | #include <assert.h> | |
35 | #include <unistd.h> | |
b36be3a1 RK |
36 | #include <fcntl.h> |
37 | #include <sys/stat.h> | |
c240ff9a | 38 | #include <sys/wait.h> |
f640bcb3 | 39 | |
9faa7a88 | 40 | #include "hash.h" |
b36be3a1 | 41 | #include "mem.h" |
f640bcb3 RK |
42 | #include "macros.h" |
43 | #include "sink.h" | |
44 | #include "syscalls.h" | |
45 | #include "log.h" | |
46 | #include "wstat.h" | |
47 | #include "kvp.h" | |
b36be3a1 RK |
48 | #include "split.h" |
49 | #include "printf.h" | |
50 | #include "vector.h" | |
2257512d | 51 | #include "filepart.h" |
b36be3a1 RK |
52 | |
53 | static struct vector include_path; | |
f640bcb3 RK |
54 | |
55 | /** @brief Return 1 if @p s is 'true' else 0 */ | |
56 | int mx_str2bool(const char *s) { | |
57 | return !strcmp(s, "true"); | |
58 | } | |
59 | ||
60 | /** @brief Return "true" if @p n is nonzero else "false" */ | |
61 | const char *mx_bool2str(int n) { | |
62 | return n ? "true" : "false"; | |
63 | } | |
64 | ||
b36be3a1 | 65 | /** @brief Write a boolean result */ |
71634563 | 66 | int mx_bool_result(struct sink *output, int result) { |
b36be3a1 RK |
67 | if(sink_writes(output, mx_bool2str(result)) < 0) |
68 | return -1; | |
69 | else | |
70 | return 0; | |
71 | } | |
72 | ||
9faa7a88 RK |
73 | /** @brief Search the include path */ |
74 | char *mx_find(const char *name) { | |
75 | char *path; | |
76 | int n; | |
77 | ||
78 | if(name[0] == '/') { | |
79 | if(access(name, O_RDONLY) < 0) { | |
80 | error(errno, "cannot read %s", name); | |
81 | return 0; | |
82 | } | |
83 | path = xstrdup(name); | |
84 | } else { | |
85 | /* Search the include path */ | |
86 | for(n = 0; n < include_path.nvec; ++n) { | |
87 | byte_xasprintf(&path, "%s/%s", include_path.vec[n], name); | |
88 | if(access(path, O_RDONLY) == 0) | |
89 | break; | |
90 | } | |
91 | if(n >= include_path.nvec) { | |
92 | error(0, "cannot find '%s' in search path", name); | |
93 | return 0; | |
94 | } | |
95 | } | |
96 | return path; | |
97 | } | |
98 | ||
99 | /* @include{TEMPLATE}@ | |
b36be3a1 RK |
100 | * |
101 | * Includes TEMPLATE. | |
102 | * | |
103 | * TEMPLATE can be an absolute filename starting with a '/'; only the file with | |
104 | * exactly this name will be included. | |
105 | * | |
106 | * Alternatively it can be a relative filename, not starting with a '/'. In | |
107 | * this case the file will be searched for in the include path. When searching | |
108 | * paths, unreadable files are treated as if they do not exist (rather than | |
109 | * matching then producing an error). | |
f640bcb3 | 110 | * |
b36be3a1 RK |
111 | * If the name chosen ends ".tmpl" then the file will be expanded as a |
112 | * template. Anything else is included byte-for-byte without further | |
113 | * modification. | |
114 | * | |
115 | * Only regular files are allowed (no devices, sockets or name pipes). | |
f640bcb3 RK |
116 | */ |
117 | static int exp_include(int attribute((unused)) nargs, | |
b36be3a1 RK |
118 | char **args, |
119 | struct sink *output, | |
120 | void *u) { | |
9faa7a88 | 121 | const char *path; |
b36be3a1 RK |
122 | int fd, n; |
123 | char buffer[4096]; | |
124 | struct stat sb; | |
b36be3a1 | 125 | |
9faa7a88 | 126 | if(!(path = mx_find(args[0]))) { |
f5fdc06f | 127 | if(sink_printf(output, "[[cannot find '%s']]", args[0]) < 0) |
dd0f422a | 128 | return 0; |
9faa7a88 | 129 | return 0; |
b36be3a1 RK |
130 | } |
131 | /* If it's a template expand it */ | |
132 | if(strlen(path) >= 5 && !strncmp(path + strlen(path) - 5, ".tmpl", 5)) | |
133 | return mx_expand_file(path, output, u); | |
134 | /* Read the raw file. As with mx_expand_file() we insist that the file is a | |
135 | * regular file. */ | |
136 | if((fd = open(path, O_RDONLY)) < 0) | |
137 | fatal(errno, "error opening %s", path); | |
138 | if(fstat(fd, &sb) < 0) | |
139 | fatal(errno, "error statting %s", path); | |
140 | if(!S_ISREG(sb.st_mode)) | |
141 | fatal(0, "%s: not a regular file", path); | |
142 | while((n = read(fd, buffer, sizeof buffer)) > 0) { | |
143 | if(sink_write(output, buffer, n) < 0) { | |
144 | xclose(fd); | |
145 | return -1; | |
146 | } | |
147 | } | |
148 | if(n < 0) | |
149 | fatal(errno, "error reading %s", path); | |
150 | xclose(fd); | |
151 | return 0; | |
f640bcb3 RK |
152 | } |
153 | ||
9faa7a88 | 154 | /* @include{COMMAND}@ |
f640bcb3 RK |
155 | * |
156 | * Executes COMMAND via the shell (using "sh -c") and copies its | |
157 | * standard output to the template output. The shell command output | |
158 | * is not expanded or modified in any other way. | |
159 | * | |
160 | * The shell command's standard error is copied to the error log. | |
161 | * | |
162 | * If the shell exits nonzero then this is reported to the error log | |
163 | * but otherwise no special action is taken. | |
164 | */ | |
165 | static int exp_shell(int attribute((unused)) nargs, | |
166 | char **args, | |
167 | struct sink *output, | |
168 | void attribute((unused)) *u) { | |
169 | int w, p[2], n; | |
170 | char buffer[4096]; | |
171 | pid_t pid; | |
172 | ||
173 | xpipe(p); | |
174 | if(!(pid = xfork())) { | |
175 | exitfn = _exit; | |
176 | xclose(p[0]); | |
177 | xdup2(p[1], 1); | |
178 | xclose(p[1]); | |
179 | execlp("sh", "sh", "-c", args[0], (char *)0); | |
180 | fatal(errno, "error executing sh"); | |
181 | } | |
182 | xclose(p[1]); | |
183 | while((n = read(p[0], buffer, sizeof buffer))) { | |
184 | if(n < 0) { | |
185 | if(errno == EINTR) | |
186 | continue; | |
187 | else | |
188 | fatal(errno, "error reading from pipe"); | |
189 | } | |
190 | if(output->write(output, buffer, n) < 0) | |
191 | return -1; | |
192 | } | |
193 | xclose(p[0]); | |
194 | while((n = waitpid(pid, &w, 0)) < 0 && errno == EINTR) | |
195 | ; | |
196 | if(n < 0) | |
197 | fatal(errno, "error calling waitpid"); | |
198 | if(w) | |
199 | error(0, "shell command '%s' %s", args[0], wstat(w)); | |
200 | return 0; | |
201 | } | |
202 | ||
9faa7a88 | 203 | /* @if{CONDITION}{IF-TRUE}{IF-FALSE}@ |
f640bcb3 RK |
204 | * |
205 | * If CONDITION is "true" then evaluates to IF-TRUE. Otherwise | |
206 | * evaluates to IF-FALSE. The IF-FALSE part is optional. | |
207 | */ | |
208 | static int exp_if(int nargs, | |
209 | const struct mx_node **args, | |
210 | struct sink *output, | |
211 | void *u) { | |
212 | char *s; | |
213 | int rc; | |
214 | ||
b36be3a1 | 215 | if((rc = mx_expandstr(args[0], &s, u, "argument #0 (CONDITION)"))) |
f640bcb3 RK |
216 | return rc; |
217 | if(mx_str2bool(s)) | |
218 | return mx_expand(args[1], output, u); | |
219 | else if(nargs > 2) | |
220 | return mx_expand(args[2], output, u); | |
221 | else | |
222 | return 0; | |
223 | } | |
224 | ||
9faa7a88 | 225 | /* @and{BRANCH}{BRANCH}...@ |
f640bcb3 RK |
226 | * |
227 | * Expands to "true" if all the branches are "true" otherwise to "false". If | |
228 | * there are no brances then the result is "true". Only as many branches as | |
229 | * necessary to compute the answer are evaluated (starting from the first one), | |
230 | * so if later branches have side effects they may not take place. | |
231 | */ | |
232 | static int exp_and(int nargs, | |
233 | const struct mx_node **args, | |
234 | struct sink *output, | |
235 | void *u) { | |
236 | int n, result = 1, rc; | |
b36be3a1 | 237 | char *s, *argname; |
f640bcb3 RK |
238 | |
239 | for(n = 0; n < nargs; ++n) { | |
b36be3a1 RK |
240 | byte_xasprintf(&argname, "argument #%d", n); |
241 | if((rc = mx_expandstr(args[n], &s, u, argname))) | |
f640bcb3 RK |
242 | return rc; |
243 | if(!mx_str2bool(s)) { | |
244 | result = 0; | |
245 | break; | |
246 | } | |
247 | } | |
b36be3a1 | 248 | return mx_bool_result(output, result); |
f640bcb3 RK |
249 | } |
250 | ||
9faa7a88 | 251 | /* @or{BRANCH}{BRANCH}...@ |
f640bcb3 RK |
252 | * |
253 | * Expands to "true" if any of the branches are "true" otherwise to "false". | |
254 | * If there are no brances then the result is "false". Only as many branches | |
255 | * as necessary to compute the answer are evaluated (starting from the first | |
256 | * one), so if later branches have side effects they may not take place. | |
257 | */ | |
258 | static int exp_or(int nargs, | |
259 | const struct mx_node **args, | |
260 | struct sink *output, | |
261 | void *u) { | |
262 | int n, result = 0, rc; | |
b36be3a1 | 263 | char *s, *argname; |
f640bcb3 RK |
264 | |
265 | for(n = 0; n < nargs; ++n) { | |
b36be3a1 RK |
266 | byte_xasprintf(&argname, "argument #%d", n); |
267 | if((rc = mx_expandstr(args[n], &s, u, argname))) | |
f640bcb3 RK |
268 | return rc; |
269 | if(mx_str2bool(s)) { | |
270 | result = 1; | |
271 | break; | |
272 | } | |
273 | } | |
b36be3a1 | 274 | return mx_bool_result(output, result); |
f640bcb3 RK |
275 | } |
276 | ||
9faa7a88 | 277 | /* @not{CONDITION}@ |
f640bcb3 RK |
278 | * |
279 | * Expands to "true" unless CONDITION is "true" in which case "false". | |
280 | */ | |
281 | static int exp_not(int attribute((unused)) nargs, | |
282 | char **args, | |
283 | struct sink *output, | |
284 | void attribute((unused)) *u) { | |
b36be3a1 | 285 | return mx_bool_result(output, !mx_str2bool(args[0])); |
f640bcb3 RK |
286 | } |
287 | ||
9faa7a88 | 288 | /* @#{...}@ |
f640bcb3 RK |
289 | * |
290 | * Expands to nothing. The argument(s) are not fully evaluated, and no side | |
291 | * effects occur. | |
292 | */ | |
293 | static int exp_comment(int attribute((unused)) nargs, | |
294 | const struct mx_node attribute((unused)) **args, | |
295 | struct sink attribute((unused)) *output, | |
296 | void attribute((unused)) *u) { | |
297 | return 0; | |
298 | } | |
299 | ||
9faa7a88 | 300 | /* @urlquote{STRING}@ |
f640bcb3 RK |
301 | * |
302 | * URL-quotes a string, i.e. replaces any characters not safe to use unquoted | |
303 | * in a URL with %-encoded form. | |
304 | */ | |
305 | static int exp_urlquote(int attribute((unused)) nargs, | |
306 | char **args, | |
307 | struct sink *output, | |
308 | void attribute((unused)) *u) { | |
309 | if(sink_writes(output, urlencodestring(args[0])) < 0) | |
310 | return -1; | |
311 | else | |
312 | return 0; | |
313 | } | |
314 | ||
9faa7a88 | 315 | /* @eq{S1}{S2}...@ |
b36be3a1 RK |
316 | * |
317 | * Expands to "true" if all the arguments are identical, otherwise to "false" | |
318 | * (i.e. if any pair of arguments differs). | |
319 | * | |
320 | * If there are no arguments then expands to "true". Evaluates all arguments | |
321 | * (with their side effects) even if that's not strictly necessary to discover | |
322 | * the result. | |
323 | */ | |
324 | static int exp_eq(int nargs, | |
325 | char **args, | |
326 | struct sink *output, | |
327 | void attribute((unused)) *u) { | |
328 | int n, result = 1; | |
329 | ||
330 | for(n = 1; n < nargs; ++n) { | |
331 | if(strcmp(args[n], args[0])) { | |
332 | result = 0; | |
333 | break; | |
334 | } | |
335 | } | |
336 | return mx_bool_result(output, result); | |
337 | } | |
338 | ||
9faa7a88 | 339 | /* @ne{S1}{S2}...@ |
b36be3a1 RK |
340 | * |
341 | * Expands to "true" if all of the arguments differ from one another, otherwise | |
342 | * to "false" (i.e. if any value appears more than once). | |
343 | * | |
344 | * If there are no arguments then expands to "true". Evaluates all arguments | |
345 | * (with their side effects) even if that's not strictly necessary to discover | |
346 | * the result. | |
347 | */ | |
348 | static int exp_ne(int nargs, | |
349 | char **args, | |
350 | struct sink *output, | |
351 | void attribute((unused))*u) { | |
352 | hash *h = hash_new(sizeof (char *)); | |
353 | int n, result = 1; | |
354 | ||
355 | for(n = 0; n < nargs; ++n) | |
356 | if(hash_add(h, args[n], "", HASH_INSERT)) { | |
357 | result = 0; | |
358 | break; | |
359 | } | |
360 | return mx_bool_result(output, result); | |
361 | } | |
362 | ||
9faa7a88 | 363 | /* @discard{...}@ |
b36be3a1 RK |
364 | * |
365 | * Expands to nothing. Unlike the comment expansion @#{...}, side effects of | |
366 | * arguments are not suppressed. So this can be used to surround a collection | |
367 | * of macro definitions with whitespace, free text commentary, etc. | |
368 | */ | |
369 | static int exp_discard(int attribute((unused)) nargs, | |
370 | char attribute((unused)) **args, | |
371 | struct sink attribute((unused)) *output, | |
372 | void attribute((unused)) *u) { | |
373 | return 0; | |
374 | } | |
375 | ||
9faa7a88 | 376 | /* @define{NAME}{ARG1 ARG2...}{DEFINITION}@ |
b36be3a1 RK |
377 | * |
378 | * Define a macro. The macro will be called NAME and will act like an | |
379 | * expansion. When it is expanded, the expansion is replaced by DEFINITION, | |
380 | * with each occurence of @ARG1@ etc replaced by the parameters to the | |
381 | * expansion. | |
382 | */ | |
383 | static int exp_define(int attribute((unused)) nargs, | |
384 | const struct mx_node **args, | |
385 | struct sink attribute((unused)) *output, | |
386 | void attribute((unused)) *u) { | |
387 | char **as, *name, *argnames; | |
388 | int rc, nas; | |
389 | ||
390 | if((rc = mx_expandstr(args[0], &name, u, "argument #0 (NAME)"))) | |
391 | return rc; | |
392 | if((rc = mx_expandstr(args[1], &argnames, u, "argument #1 (ARGS)"))) | |
393 | return rc; | |
394 | as = split(argnames, &nas, 0, 0, 0); | |
395 | mx_register_macro(name, nas, as, args[2]); | |
396 | return 0; | |
397 | } | |
398 | ||
2257512d RK |
399 | /* @basename{PATH} |
400 | * | |
401 | * Expands to the UNQUOTED basename of PATH. | |
402 | */ | |
403 | static int exp_basename(int attribute((unused)) nargs, | |
404 | char **args, | |
405 | struct sink attribute((unused)) *output, | |
406 | void attribute((unused)) *u) { | |
407 | return sink_writes(output, d_basename(args[0])) < 0 ? -1 : 0; | |
408 | } | |
409 | ||
410 | /* @dirname{PATH} | |
411 | * | |
412 | * Expands to the UNQUOTED directory name of PATH. | |
413 | */ | |
414 | static int exp_dirname(int attribute((unused)) nargs, | |
415 | char **args, | |
416 | struct sink attribute((unused)) *output, | |
417 | void attribute((unused)) *u) { | |
418 | return sink_writes(output, d_dirname(args[0])) < 0 ? -1 : 0; | |
419 | } | |
420 | ||
721d8bf4 RK |
421 | /* @q{STRING} |
422 | * | |
423 | * Expands to STRING. | |
424 | */ | |
425 | static int exp_q(int attribute((unused)) nargs, | |
426 | char **args, | |
427 | struct sink attribute((unused)) *output, | |
428 | void attribute((unused)) *u) { | |
429 | return sink_writes(output, args[0]) < 0 ? -1 : 0; | |
430 | } | |
431 | ||
dd0f422a | 432 | /** @brief Register built-in expansions */ |
f640bcb3 | 433 | void mx_register_builtin(void) { |
2257512d RK |
434 | mx_register("basename", 1, 1, exp_basename); |
435 | mx_register("dirname", 1, 1, exp_dirname); | |
b36be3a1 RK |
436 | mx_register("discard", 0, INT_MAX, exp_discard); |
437 | mx_register("eq", 0, INT_MAX, exp_eq); | |
f640bcb3 | 438 | mx_register("include", 1, 1, exp_include); |
b36be3a1 | 439 | mx_register("ne", 0, INT_MAX, exp_ne); |
f640bcb3 | 440 | mx_register("not", 1, 1, exp_not); |
b36be3a1 | 441 | mx_register("shell", 1, 1, exp_shell); |
f640bcb3 | 442 | mx_register("urlquote", 1, 1, exp_urlquote); |
721d8bf4 | 443 | mx_register("q", 1, 1, exp_q); |
2257512d RK |
444 | mx_register_magic("#", 0, INT_MAX, exp_comment); |
445 | mx_register_magic("and", 0, INT_MAX, exp_and); | |
446 | mx_register_magic("define", 3, 3, exp_define); | |
447 | mx_register_magic("if", 2, 3, exp_if); | |
448 | mx_register_magic("or", 0, INT_MAX, exp_or); | |
f640bcb3 RK |
449 | } |
450 | ||
dd0f422a RK |
451 | /** @brief Add a directory to the search path |
452 | * @param s Directory to add | |
453 | */ | |
454 | void mx_search_path(const char *s) { | |
455 | vector_append(&include_path, xstrdup(s)); | |
456 | } | |
457 | ||
f640bcb3 RK |
458 | /* |
459 | Local Variables: | |
460 | c-basic-offset:2 | |
461 | comment-column:40 | |
462 | fill-column:79 | |
463 | indent-tabs-mode:nil | |
464 | End: | |
465 | */ |