/* mini man implementation for busybox * Copyright (C) 2008 Denys Vlasenko * 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 deing 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 */ static int run_pipe(const char *unpacker, const char *pager, char *man_filename) { char *cmd; if (access(man_filename, R_OK) != 0) return 0; if (option_mask32 & OPT_w) { puts(man_filename); return 1; } cmd = xasprintf("%s '%s' | gtbl | nroff -Tlatin1 -mandoc | %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 len; if (run_pipe("bunzip2 -c", pager, man_filename)) 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)) return 1; man_filename[len - 3] = '\0'; /* ".gz" -> "" */ if (run_pipe("cat", pager, man_filename)) return 1; return 0; } int man_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int man_main(int argc ATTRIBUTE_UNUSED, char **argv) { FILE *cf; const char *pager; char **man_path_list; char *sec_list; char *cur_path, *cur_sect; char *line, *value; int count_mp, alloc_mp, cur_mp; int opt; 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"); alloc_mp = 10; man_path_list = xmalloc(10 * 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 */ cf = fopen_or_warn("/etc/man.conf", "r"); if (cf) { /* go through man configuration file and search relevant paths, sections */ while ((line = xmalloc_fgetline(cf)) != NULL) { trim(line); /* remove whitespace at the beginning/end */ if (isspace(line[7])) { line[7] = '\0'; value = skip_whitespace(&line[8]); *skip_non_whitespace(value) = '\0'; if (strcmp("MANPATH", line) == 0) { man_path_list[count_mp] = xstrdup(value); count_mp++; if (alloc_mp == count_mp) { alloc_mp += 10; man_path_list = xrealloc(man_path_list, alloc_mp * sizeof(man_path_list[0])); } /* thus man_path_list is always NULL terminated */ } if (strcmp("MANSECT", line) == 0) { free(sec_list); sec_list = xstrdup(value); } } free(line); } fclose(cf); } do { /* for each argv[] */ 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 = xasprintf("%.*s/man%.*s/%s.%.*s" ".bz2", path_len, cur_path, sect_len, cur_sect, *argv, sect_len, cur_sect); int found = show_manpage(pager, man_filename); 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); } next_arg: argv++; } while (*argv); return EXIT_SUCCESS; }