| /* 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) |
| { |
| FILE *cf; |
| const char *pager; |
| char **man_path_list; |
| char *sec_list; |
| char *cur_path, *cur_sect; |
| char *line, *value; |
| int count_mp, cur_mp; |
| int opt, not_found; |
| |
| 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 */ |
| 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++; |
| /* man_path_list is NULL terminated */ |
| man_path_list[count_mp] = NULL; |
| man_path_list = xrealloc_vector(man_path_list, 4, count_mp); |
| } |
| if (strcmp("MANSECT", line) == 0) { |
| free(sec_list); |
| sec_list = xstrdup(value); |
| } |
| } |
| free(line); |
| } |
| fclose(cf); |
| } |
| |
| // 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; |
| } |