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|
/* 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 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, *sec_list;
char *cur_path, *cur_sect;
char *line, *value;
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");
man_path = xstrdup(getenv("MANPATH"));
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) {
free(man_path);
man_path = xstrdup(value);
}
if (strcmp("MANSECT", line) == 0) {
free(sec_list);
sec_list = xstrdup(value);
}
}
free(line);
}
fclose(cf);
}
do { /* for each argv[] */
cur_path = man_path;
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);
if (show_manpage(pager, man_filename)) {
if (!(opt & OPT_a)) {
goto next_arg;
}
}
free(man_filename);
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;
}
|
