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- /* mini man implementation for busybox
- * Copyright (C) 2008 Denys Vlasenko <vda.linux@googlemail.com>
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
- */
- #include "libbb.h"
- enum {
- OPT_a = 1, /* all */
- OPT_w = 2, /* print path */
- };
- /* This is what I see on my desktop system being executed:
- (
- echo ".ll 12.4i"
- echo ".nr LL 12.4i"
- echo ".pl 1100i"
- gunzip -c '/usr/man/man1/bzip2.1.gz'
- echo ".\\\""
- echo ".pl \n(nlu+10"
- ) | gtbl | nroff -Tlatin1 -mandoc | less
- */
- /* Trick gcc to reuse "cat" string. */
- #define STR_catNULmanNUL "cat\0man"
- #define STR_cat "cat\0man"
- static int run_pipe(const char *unpacker, const char *pager, char *man_filename, int man)
- {
- char *cmd;
- if (access(man_filename, R_OK) != 0)
- return 0;
- if (option_mask32 & OPT_w) {
- puts(man_filename);
- return 1;
- }
- /* "2>&1" is added so that nroff errors are shown in pager too.
- * Otherwise it may show just empty screen */
- cmd = xasprintf(
- man ? "%s '%s' | gtbl | nroff -Tlatin1 -mandoc 2>&1 | %s"
- : "%s '%s' | %s",
- unpacker, man_filename, pager);
- system(cmd);
- free(cmd);
- return 1;
- }
- /* man_filename is of the form "/dir/dir/dir/name.s.bz2" */
- static int show_manpage(const char *pager, char *man_filename, int man)
- {
- int len;
- if (run_pipe("bunzip2 -c", pager, man_filename, man))
- return 1;
- len = strlen(man_filename) - 1;
- man_filename[len] = '\0'; /* ".bz2" -> ".gz" */
- man_filename[len - 2] = 'g';
- if (run_pipe("gunzip -c", pager, man_filename, man))
- return 1;
- man_filename[len - 3] = '\0'; /* ".gz" -> "" */
- if (run_pipe(STR_cat, pager, man_filename, man))
- return 1;
- return 0;
- }
- int man_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
- int man_main(int argc UNUSED_PARAM, char **argv)
- {
- parser_t *parser;
- const char *pager;
- char **man_path_list;
- char *sec_list;
- char *cur_path, *cur_sect;
- int count_mp, cur_mp;
- int opt, not_found;
- char *token[2];
- opt_complementary = "-1"; /* at least one argument */
- opt = getopt32(argv, "+aw");
- argv += optind;
- sec_list = xstrdup("1:2:3:4:5:6:7:8:9");
- /* Last valid man_path_list[] is [0x10] */
- man_path_list = xzalloc(0x11 * sizeof(man_path_list[0]));
- count_mp = 0;
- man_path_list[0] = xstrdup(getenv("MANPATH"));
- if (man_path_list[0])
- count_mp++;
- pager = getenv("MANPAGER");
- if (!pager) {
- pager = getenv("PAGER");
- if (!pager)
- pager = "more";
- }
- /* Parse man.conf */
- parser = config_open("/etc/man.conf");
- while (config_read(parser, token, 2, 0, "# \t", PARSE_NORMAL)) {
- if (!token[1])
- continue;
- if (strcmp("MANPATH", token[0]) == 0) {
- man_path_list = xrealloc_vector(man_path_list, 4, count_mp);
- man_path_list[count_mp] = xstrdup(token[1]);
- count_mp++;
- /* man_path_list is NULL terminated */
- /*man_path_list[count_mp] = NULL; - xrealloc_vector did it */
- }
- if (strcmp("MANSECT", token[0]) == 0) {
- free(sec_list);
- sec_list = xstrdup(token[1]);
- }
- }
- config_close(parser);
- // TODO: my man3/getpwuid.3.gz contains just one line:
- // .so man3/getpwnam.3
- // (and I _dont_ have man3/getpwnam.3, I have man3/getpwnam.3.gz)
- // need to support this...
- not_found = 0;
- do { /* for each argv[] */
- int found = 0;
- cur_mp = 0;
- while ((cur_path = man_path_list[cur_mp++]) != NULL) {
- /* for each MANPATH */
- do { /* for each MANPATH item */
- char *next_path = strchrnul(cur_path, ':');
- int path_len = next_path - cur_path;
- cur_sect = sec_list;
- do { /* for each section */
- char *next_sect = strchrnul(cur_sect, ':');
- int sect_len = next_sect - cur_sect;
- char *man_filename;
- int cat0man1 = 0;
- /* Search for cat, then man page */
- while (cat0man1 < 2) {
- int found_here;
- man_filename = xasprintf("%.*s/%s%.*s/%s.%.*s" ".bz2",
- path_len, cur_path,
- STR_catNULmanNUL + cat0man1 * 4,
- sect_len, cur_sect,
- *argv,
- sect_len, cur_sect);
- found_here = show_manpage(pager, man_filename, cat0man1);
- found |= found_here;
- cat0man1 += found_here + 1;
- free(man_filename);
- }
- if (found && !(opt & OPT_a))
- goto next_arg;
- cur_sect = next_sect;
- while (*cur_sect == ':')
- cur_sect++;
- } while (*cur_sect);
- cur_path = next_path;
- while (*cur_path == ':')
- cur_path++;
- } while (*cur_path);
- }
- if (!found) {
- bb_error_msg("no manual entry for '%s'", *argv);
- not_found = 1;
- }
- next_arg:
- argv++;
- } while (*argv);
- return not_found;
- }
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