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24#include "libbb.h"
25#include "common_bufsiz.h"
26
27enum {
28 OPT_a = 1,
29 OPT_w = 2,
30};
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58struct globals {
59 const char *col;
60 const char *tbl;
61 const char *nroff;
62 const char *pager;
63} FIX_ALIASING;
64#define G (*(struct globals*)bb_common_bufsiz1)
65#define INIT_G() do { \
66 setup_common_bufsiz(); \
67 G.col = "col"; \
68 G.tbl = "tbl"; \
69 \
70 G.nroff = "nroff -mandoc"; \
71 G.pager = ENABLE_LESS ? "less" : "more"; \
72} while (0)
73
74static int show_manpage(char *man_filename, int man, int level);
75
76static int run_pipe(char *man_filename, int man, int level)
77{
78 char *cmd;
79
80
81 if (level > 10)
82 return 0;
83
84 if (access(man_filename, R_OK) != 0)
85 return 0;
86
87 if (option_mask32 & OPT_w) {
88 puts(man_filename);
89 return 1;
90 }
91
92 if (man) {
93
94
95
96
97 struct stat sb;
98 char *line;
99 char *linkname, *p;
100
101
102
103
104
105 xstat(man_filename, &sb);
106 if (sb.st_size > 300)
107 goto ordinary_manpage;
108
109 line = xmalloc_open_zipped_read_close(man_filename, NULL);
110 if (!line || !is_prefixed_with(line, ".so ")) {
111 free(line);
112 goto ordinary_manpage;
113 }
114
115
116
117 *strchrnul(line, '\n') = '\0';
118 linkname = skip_whitespace(&line[4]);
119
120
121
122
123 p = strrchr(man_filename, '/');
124 if (!p)
125 goto ordinary_manpage;
126 *p = '\0';
127 if (strchr(linkname, '/')) {
128 p = strrchr(man_filename, '/');
129 if (!p)
130 goto ordinary_manpage;
131 *p = '\0';
132 }
133
134
135
136 man_filename = xasprintf("%s/%s", man_filename, linkname);
137 free(line);
138
139 if (show_manpage(man_filename, man, level + 1))
140 return 1;
141
142 }
143
144 ordinary_manpage:
145 close(STDIN_FILENO);
146 open_zipped(man_filename, 0);
147 if (man) {
148 int w = get_terminal_width(-1);
149 if (w > 10)
150 w -= 2;
151
152
153
154 cmd = xasprintf("%s | %s -rLL=%un -rLT=%un 2>&1 | %s",
155 G.tbl, G.nroff, w, w,
156 G.pager);
157 } else {
158 cmd = xstrdup(G.pager);
159 }
160 system(cmd);
161 free(cmd);
162 return 1;
163}
164
165
166static int show_manpage(char *man_filename, int man, int level)
167{
168#if SEAMLESS_COMPRESSION
169
170 char *filename_with_zext = xasprintf("%s.lzma", man_filename);
171 char *ext = strrchr(filename_with_zext, '.') + 1;
172#endif
173
174#if ENABLE_FEATURE_SEAMLESS_LZMA
175 if (run_pipe(filename_with_zext, man, level))
176 return 1;
177#endif
178#if ENABLE_FEATURE_SEAMLESS_XZ
179 strcpy(ext, "xz");
180 if (run_pipe(filename_with_zext, man, level))
181 return 1;
182#endif
183#if ENABLE_FEATURE_SEAMLESS_BZ2
184 strcpy(ext, "bz2");
185 if (run_pipe(filename_with_zext, man, level))
186 return 1;
187#endif
188#if ENABLE_FEATURE_SEAMLESS_GZ
189 strcpy(ext, "gz");
190 if (run_pipe(filename_with_zext, man, level))
191 return 1;
192#endif
193
194 return run_pipe(man_filename, man, level);
195}
196
197static char **add_MANPATH(char **man_path_list, int *count_mp, char *path)
198{
199 if (path) while (*path) {
200 char *next_path;
201 char **path_element;
202
203 next_path = strchr(path, ':');
204 if (next_path) {
205 if (next_path == path)
206 goto next;
207 *next_path = '\0';
208 }
209
210 path_element = man_path_list;
211 if (path_element) while (*path_element) {
212 if (strcmp(*path_element, path) == 0)
213 goto skip;
214 path_element++;
215 }
216 man_path_list = xrealloc_vector(man_path_list, 4, *count_mp);
217 man_path_list[*count_mp] = xstrdup(path);
218 (*count_mp)++;
219
220
221 skip:
222 if (!next_path)
223 break;
224
225 *next_path = ':';
226 next:
227 path = next_path + 1;
228 }
229 return man_path_list;
230}
231
232static const char *if_redefined(const char *var, const char *key, const char *line)
233{
234 if (!is_prefixed_with(line, key))
235 return var;
236 line += strlen(key);
237 if (!isspace(line[0]))
238 return var;
239 return xstrdup(skip_whitespace(line));
240}
241
242int man_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
243int man_main(int argc UNUSED_PARAM, char **argv)
244{
245 parser_t *parser;
246 char *sec_list;
247 char *cur_path, *cur_sect;
248 char **man_path_list;
249 int count_mp;
250 int cur_mp;
251 int opt, not_found;
252 char *token[2];
253
254 INIT_G();
255
256 opt = getopt32(argv, "^+" "aw" "\0" "-1");
257 argv += optind;
258
259 sec_list = xstrdup("0p:1:1p:2:3:3p:4:5:6:7:8:9");
260
261 count_mp = 0;
262 man_path_list = add_MANPATH(NULL, &count_mp,
263 getenv("MANDATORY_MANPATH"+10)
264 );
265 if (!man_path_list) {
266
267 man_path_list = xzalloc(2 * sizeof(man_path_list[0]));
268 man_path_list[0] = (char*)"/usr/man";
269
270
271
272
273 }
274
275
276
277
278 parser = config_open2("/etc/man.config", fopen_for_read);
279 if (!parser)
280 parser = config_open2("/etc/man.conf", fopen_for_read);
281 if (!parser)
282 parser = config_open2("/etc/man_db.conf", fopen_for_read);
283
284 while (config_read(parser, token, 2, 0, "# \t", PARSE_NORMAL)) {
285 if (!token[1])
286 continue;
287 if (strcmp("DEFINE", token[0]) == 0) {
288 G.col = if_redefined(G.tbl , "col", token[1]);
289 G.tbl = if_redefined(G.tbl , "tbl", token[1]);
290 G.nroff = if_redefined(G.nroff, "nroff", token[1]);
291 G.pager = if_redefined(G.pager, "pager", token[1]);
292 } else
293 if (strcmp("MANDATORY_MANPATH"+10, token[0]) == 0
294 || strcmp("MANDATORY_MANPATH", token[0]) == 0
295 ) {
296 man_path_list = add_MANPATH(man_path_list, &count_mp, token[1]);
297 }
298 if (strcmp("MANSECT", token[0]) == 0) {
299 free(sec_list);
300 sec_list = xstrdup(token[1]);
301 }
302 }
303 config_close(parser);
304
305 {
306
307 char *env_pager = getenv("MANPAGER");
308 if (!env_pager)
309 env_pager = getenv("PAGER");
310 if (env_pager)
311 G.pager = env_pager;
312 }
313
314 if (!isatty(STDOUT_FILENO)) {
315 putenv((char*)"GROFF_NO_SGR=1");
316 G.pager = xasprintf("%s -b -p -x", G.col);
317 }
318
319 not_found = 0;
320 do {
321 int found = 0;
322 cur_mp = 0;
323
324 if (strchr(*argv, '/')) {
325 found = show_manpage(*argv, 1, 0);
326 goto check_found;
327 }
328 while ((cur_path = man_path_list[cur_mp++]) != NULL) {
329
330 cur_sect = sec_list;
331 do {
332 char *next_sect = strchrnul(cur_sect, ':');
333 int sect_len = next_sect - cur_sect;
334 char *man_filename;
335 int cat0man1 = 0;
336
337
338 while (cat0man1 < 2) {
339 int found_here;
340 man_filename = xasprintf("%s/%s%.*s/%s.%.*s",
341 cur_path,
342 "cat\0man" + (cat0man1 * 4),
343 sect_len, cur_sect,
344 *argv,
345 sect_len, cur_sect);
346 found_here = show_manpage(man_filename, cat0man1, 0);
347 found |= found_here;
348 cat0man1 += found_here + 1;
349 free(man_filename);
350 }
351
352 if (found && !(opt & OPT_a))
353 goto next_arg;
354 cur_sect = next_sect;
355 while (*cur_sect == ':')
356 cur_sect++;
357 } while (*cur_sect);
358 }
359 check_found:
360 if (!found) {
361 bb_error_msg("no manual entry for '%s'", *argv);
362 not_found = 1;
363 }
364 next_arg:
365 argv++;
366 } while (*argv);
367
368 return not_found;
369}
370