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function old new delta is_prefixed_with - 18 +18 complete_username 78 77 -1 man_main 737 735 -2 fsck_device 429 427 -2 unpack_ar_archive 80 76 -4 strip_unsafe_prefix 105 101 -4 singlemount 1054 1050 -4 rtc_adjtime_is_utc 90 86 -4 resolve_mount_spec 88 84 -4 parse_one_line 1029 1025 -4 parse_conf 1460 1456 -4 may_wakeup 83 79 -4 loadkmap_main 219 215 -4 get_irqs_from_stat 103 99 -4 get_header_cpio 913 909 -4 findfs_main 79 75 -4 fbsplash_main 1230 1226 -4 load_crontab 776 771 -5 expand_vars_to_list 1151 1146 -5 date_main 881 876 -5 skip_dev_pfx 30 24 -6 make_device 2199 2193 -6 complete_cmd_dir_file 773 767 -6 run_applet_and_exit 715 708 -7 uudecode_main 321 313 -8 pwdx_main 197 189 -8 execute 568 560 -8 i2cdetect_main 1186 1176 -10 procps_scan 1242 1230 -12 procps_read_smaps 1017 1005 -12 process_module 746 734 -12 patch_main 1903 1891 -12 nfsmount 3572 3560 -12 stack_machine 126 112 -14 process_timer_stats 449 435 -14 match_fstype 111 97 -14 do_ipaddr 1344 1330 -14 open_list_and_close 359 343 -16 get_header_tar 1795 1779 -16 prepend_new_eth_table 340 323 -17 fsck_main 1811 1794 -17 find_iface_state 56 38 -18 dnsd_main 1321 1303 -18 base_device 179 158 -21 find_keyword 104 82 -22 handle_incoming_and_exit 2785 2762 -23 parse_and_put_prompt 774 746 -28 modinfo 347 317 -30 find_action 204 171 -33 update_passwd 1470 1436 -34 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/49 up/down: 18/-540) Total: -522 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
307 lines
7.8 KiB
C
307 lines
7.8 KiB
C
/* mini man implementation for busybox
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* Copyright (C) 2008 Denys Vlasenko <vda.linux@googlemail.com>
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//usage:#define man_trivial_usage
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//usage: "[-aw] [MANPAGE]..."
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//usage:#define man_full_usage "\n\n"
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//usage: "Format and display manual page\n"
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//usage: "\n -a Display all pages"
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//usage: "\n -w Show page locations"
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#include "libbb.h"
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enum {
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OPT_a = 1, /* all */
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OPT_w = 2, /* print path */
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};
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/* This is what I see on my desktop system being executed:
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(
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echo ".ll 12.4i"
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echo ".nr LL 12.4i"
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echo ".pl 1100i"
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gunzip -c '/usr/man/man1/bzip2.1.gz'
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echo ".\\\""
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echo ".pl \n(nlu+10"
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) | gtbl | nroff -Tlatin1 -mandoc | less
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*/
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static int show_manpage(const char *pager, char *man_filename, int man, int level);
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static int run_pipe(const char *pager, char *man_filename, int man, int level)
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{
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char *cmd;
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/* Prevent man page link loops */
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if (level > 10)
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return 0;
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if (access(man_filename, R_OK) != 0)
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return 0;
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if (option_mask32 & OPT_w) {
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puts(man_filename);
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return 1;
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}
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if (man) { /* man page, not cat page */
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/* Is this a link to another manpage? */
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/* The link has the following on the first line: */
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/* ".so another_man_page" */
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struct stat sb;
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char *line;
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char *linkname, *p;
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/* On my system:
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* man1/genhostid.1.gz: 203 bytes - smallest real manpage
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* man2/path_resolution.2.gz: 114 bytes - largest link
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*/
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xstat(man_filename, &sb);
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if (sb.st_size > 300) /* err on the safe side */
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goto ordinary_manpage;
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line = xmalloc_open_zipped_read_close(man_filename, NULL);
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if (!line || !is_prefixed_with(line, ".so ")) {
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free(line);
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goto ordinary_manpage;
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}
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/* Example: man2/path_resolution.2.gz contains
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* ".so man7/path_resolution.7\n<junk>"
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*/
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*strchrnul(line, '\n') = '\0';
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linkname = skip_whitespace(&line[4]);
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/* If link has no slashes, we just replace man page name.
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* If link has slashes (however many), we go back *once*.
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* ".so zzz/ggg/page.3" does NOT go back two levels. */
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p = strrchr(man_filename, '/');
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if (!p)
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goto ordinary_manpage;
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*p = '\0';
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if (strchr(linkname, '/')) {
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p = strrchr(man_filename, '/');
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if (!p)
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goto ordinary_manpage;
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*p = '\0';
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}
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/* Links do not have .gz extensions, even if manpage
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* is compressed */
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man_filename = xasprintf("%s/%s", man_filename, linkname);
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free(line);
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/* Note: we leak "new" man_filename string as well... */
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if (show_manpage(pager, man_filename, man, level + 1))
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return 1;
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/* else: show the link, it's better than nothing */
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}
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ordinary_manpage:
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close(STDIN_FILENO);
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open_zipped(man_filename, /*fail_if_not_compressed:*/ 0); /* guaranteed to use fd 0 (STDIN_FILENO) */
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/* "2>&1" is added so that nroff errors are shown in pager too.
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* Otherwise it may show just empty screen */
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cmd = xasprintf(
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/* replaced -Tlatin1 with -Tascii for non-UTF8 displays */
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man ? "gtbl | nroff -Tascii -mandoc 2>&1 | %s"
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: "%s",
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pager);
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system(cmd);
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free(cmd);
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return 1;
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}
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/* man_filename is of the form "/dir/dir/dir/name.s" */
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static int show_manpage(const char *pager, char *man_filename, int man, int level)
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{
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#if SEAMLESS_COMPRESSION
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/* We leak this allocation... */
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char *filename_with_zext = xasprintf("%s.lzma", man_filename);
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char *ext = strrchr(filename_with_zext, '.') + 1;
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#endif
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#if ENABLE_FEATURE_SEAMLESS_LZMA
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if (run_pipe(pager, filename_with_zext, man, level))
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return 1;
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#endif
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#if ENABLE_FEATURE_SEAMLESS_XZ
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strcpy(ext, "xz");
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if (run_pipe(pager, filename_with_zext, man, level))
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return 1;
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#endif
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#if ENABLE_FEATURE_SEAMLESS_BZ2
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strcpy(ext, "bz2");
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if (run_pipe(pager, filename_with_zext, man, level))
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return 1;
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#endif
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#if ENABLE_FEATURE_SEAMLESS_GZ
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strcpy(ext, "gz");
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if (run_pipe(pager, filename_with_zext, man, level))
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return 1;
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#endif
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return run_pipe(pager, man_filename, man, level);
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}
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static char **add_MANPATH(char **man_path_list, int *count_mp, char *path)
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{
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if (path) while (*path) {
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char *next_path;
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char **path_element;
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next_path = strchr(path, ':');
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if (next_path) {
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if (next_path == path) /* "::"? */
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goto next;
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*next_path = '\0';
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}
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/* Do we already have path? */
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path_element = man_path_list;
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if (path_element) while (*path_element) {
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if (strcmp(*path_element, path) == 0)
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goto skip;
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path_element++;
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}
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man_path_list = xrealloc_vector(man_path_list, 4, *count_mp);
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man_path_list[*count_mp] = xstrdup(path);
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(*count_mp)++;
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/* man_path_list is NULL terminated */
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/* man_path_list[*count_mp] = NULL; - xrealloc_vector did it */
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skip:
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if (!next_path)
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break;
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/* "path" may be a result of getenv(), be nice and don't mangle it */
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*next_path = ':';
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next:
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path = next_path + 1;
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}
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return man_path_list;
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}
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int man_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int man_main(int argc UNUSED_PARAM, char **argv)
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{
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parser_t *parser;
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const char *pager = ENABLE_LESS ? "less" : "more";
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char *sec_list;
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char *cur_path, *cur_sect;
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char **man_path_list;
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int count_mp;
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int cur_mp;
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int opt, not_found;
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char *token[2];
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opt_complementary = "-1"; /* at least one argument */
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opt = getopt32(argv, "+aw");
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argv += optind;
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sec_list = xstrdup("0p:1:1p:2:3:3p:4:5:6:7:8:9");
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count_mp = 0;
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man_path_list = add_MANPATH(NULL, &count_mp,
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getenv("MANDATORY_MANPATH"+10) /* "MANPATH" */
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);
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if (!man_path_list) {
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/* default, may be overridden by /etc/man.conf */
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man_path_list = xzalloc(2 * sizeof(man_path_list[0]));
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man_path_list[0] = (char*)"/usr/man";
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/* count_mp stays 0.
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* Thus, man.conf will overwrite man_path_list[0]
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* if a path is defined there.
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*/
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}
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/* Parse man.conf[ig] or man_db.conf */
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/* man version 1.6f uses man.config */
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/* man-db implementation of man uses man_db.conf */
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parser = config_open2("/etc/man.config", fopen_for_read);
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if (!parser)
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parser = config_open2("/etc/man.conf", fopen_for_read);
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if (!parser)
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parser = config_open2("/etc/man_db.conf", fopen_for_read);
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while (config_read(parser, token, 2, 0, "# \t", PARSE_NORMAL)) {
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if (!token[1])
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continue;
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if (strcmp("DEFINE", token[0]) == 0) {
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if (is_prefixed_with("pager", token[1])) {
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pager = xstrdup(skip_whitespace(token[1]) + 5);
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}
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} else
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if (strcmp("MANDATORY_MANPATH"+10, token[0]) == 0 /* "MANPATH"? */
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|| strcmp("MANDATORY_MANPATH", token[0]) == 0
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) {
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man_path_list = add_MANPATH(man_path_list, &count_mp, token[1]);
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}
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if (strcmp("MANSECT", token[0]) == 0) {
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free(sec_list);
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sec_list = xstrdup(token[1]);
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}
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}
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config_close(parser);
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{
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/* environment overrides setting from man.config */
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char *env_pager = getenv("MANPAGER");
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if (!env_pager)
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env_pager = getenv("PAGER");
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if (env_pager)
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pager = env_pager;
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}
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not_found = 0;
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do { /* for each argv[] */
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int found = 0;
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cur_mp = 0;
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if (strchr(*argv, '/')) {
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found = show_manpage(pager, *argv, /*man:*/ 1, 0);
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goto check_found;
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}
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while ((cur_path = man_path_list[cur_mp++]) != NULL) {
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/* for each MANPATH */
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cur_sect = sec_list;
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do { /* for each section */
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char *next_sect = strchrnul(cur_sect, ':');
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int sect_len = next_sect - cur_sect;
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char *man_filename;
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int cat0man1 = 0;
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/* Search for cat, then man page */
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while (cat0man1 < 2) {
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int found_here;
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man_filename = xasprintf("%s/%s%.*s/%s.%.*s",
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cur_path,
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"cat\0man" + (cat0man1 * 4),
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sect_len, cur_sect,
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*argv,
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sect_len, cur_sect);
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found_here = show_manpage(pager, man_filename, cat0man1, 0);
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found |= found_here;
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cat0man1 += found_here + 1;
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free(man_filename);
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}
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if (found && !(opt & OPT_a))
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goto next_arg;
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cur_sect = next_sect;
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while (*cur_sect == ':')
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cur_sect++;
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} while (*cur_sect);
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}
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check_found:
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if (!found) {
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bb_error_msg("no manual entry for '%s'", *argv);
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not_found = 1;
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}
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next_arg:
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argv++;
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} while (*argv);
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return not_found;
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}
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