mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-05 02:16:49 +00:00
a1e16c9298
do not warn if /etc/man.conf does not exist
270 lines
6.7 KiB
C
270 lines
6.7 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 tarball for details.
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*/
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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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#if ENABLE_FEATURE_SEAMLESS_LZMA
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#define Z_SUFFIX ".lzma"
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#elif ENABLE_FEATURE_SEAMLESS_BZ2
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#define Z_SUFFIX ".bz2"
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#elif ENABLE_FEATURE_SEAMLESS_GZ
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#define Z_SUFFIX ".gz"
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#else
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#define Z_SUFFIX ""
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#endif
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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 || strncmp(line, ".so ", 4) != 0) {
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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" Z_SUFFIX, 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); /* 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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man ? "gtbl | nroff -Tlatin1 -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" Z_SUFFIX */
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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 ENABLE_FEATURE_SEAMLESS_LZMA
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if (run_pipe(pager, man_filename, 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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#if ENABLE_FEATURE_SEAMLESS_LZMA
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strcpy(strrchr(man_filename, '.') + 1, "bz2");
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#endif
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if (run_pipe(pager, man_filename, 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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#if ENABLE_FEATURE_SEAMLESS_LZMA || ENABLE_FEATURE_SEAMLESS_BZ2
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strcpy(strrchr(man_filename, '.') + 1, "gz");
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#endif
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if (run_pipe(pager, man_filename, man, level))
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return 1;
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#endif
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#if ENABLE_FEATURE_SEAMLESS_LZMA || ENABLE_FEATURE_SEAMLESS_BZ2 || ENABLE_FEATURE_SEAMLESS_GZ
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*strrchr(man_filename, '.') = '\0';
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#endif
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if (run_pipe(pager, man_filename, man, level))
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return 1;
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return 0;
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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;
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char **man_path_list;
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char *sec_list;
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char *cur_path, *cur_sect;
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int count_mp, 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("1:2:3:4:5:6:7:8:9");
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/* Last valid man_path_list[] is [0x10] */
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count_mp = 0;
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man_path_list = xzalloc(0x11 * sizeof(man_path_list[0]));
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man_path_list[0] = getenv("MANPATH");
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if (!man_path_list[0]) /* default, may be overridden by /etc/man.conf */
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man_path_list[0] = (char*)"/usr/man";
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else
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count_mp++;
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pager = getenv("MANPAGER");
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if (!pager) {
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pager = getenv("PAGER");
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if (!pager)
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pager = "more";
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}
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/* Parse man.conf */
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parser = config_open2("/etc/man.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("MANPATH", token[0]) == 0) {
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/* Do we already have it? */
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char **path_element = man_path_list;
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while (*path_element) {
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if (strcmp(*path_element, token[1]) == 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(token[1]);
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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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}
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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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skip: ;
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}
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config_close(parser);
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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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do { /* for each MANPATH item */
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char *next_path = strchrnul(cur_path, ':');
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int path_len = next_path - cur_path;
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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" Z_SUFFIX,
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path_len, 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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cur_path = next_path;
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while (*cur_path == ':')
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cur_path++;
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} while (*cur_path);
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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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