mirror of
https://github.com/sheumann/hush.git
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181 lines
4.3 KiB
C
181 lines
4.3 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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/* Trick gcc to reuse "cat" string. */
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#define STR_catNULmanNUL "cat\0man"
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#define STR_cat "cat\0man"
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static int run_pipe(const char *unpacker, const char *pager, char *man_filename, int man)
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{
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char *cmd;
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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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/* "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 ? "%s '%s' | gtbl | nroff -Tlatin1 -mandoc 2>&1 | %s"
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: "%s '%s' | %s",
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unpacker, man_filename, 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.bz2" */
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static int show_manpage(const char *pager, char *man_filename, int man)
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{
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int len;
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if (run_pipe("bunzip2 -c", pager, man_filename, man))
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return 1;
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len = strlen(man_filename) - 1;
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man_filename[len] = '\0'; /* ".bz2" -> ".gz" */
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man_filename[len - 2] = 'g';
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if (run_pipe("gunzip -c", pager, man_filename, man))
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return 1;
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man_filename[len - 3] = '\0'; /* ".gz" -> "" */
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if (run_pipe(STR_cat, pager, man_filename, man))
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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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man_path_list = xzalloc(0x11 * sizeof(man_path_list[0]));
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count_mp = 0;
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man_path_list[0] = xstrdup(getenv("MANPATH"));
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if (man_path_list[0])
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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_open("/etc/man.conf");
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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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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;
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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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// TODO: my man3/getpwuid.3.gz contains just one line:
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// .so man3/getpwnam.3
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// (and I _dont_ have man3/getpwnam.3, I have man3/getpwnam.3.gz)
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// need to support this...
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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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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" ".bz2",
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path_len, cur_path,
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STR_catNULmanNUL + 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);
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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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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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