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phunix/commands/man/man.c
Ben Gras a187743e75 netbsd man
2010-06-26 02:35:08 +00:00

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/* $NetBSD: man.c,v 1.37 2008/07/21 14:19:24 lukem Exp $ */
/*
* Copyright (c) 1987, 1993, 1994, 1995
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/utsname.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <glob.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#include "manconf.h"
#include "pathnames.h"
#ifndef MAN_DEBUG
#define MAN_DEBUG 0 /* debug path output */
#endif
/*
* manstate: structure collecting the current global state so we can
* easily identify it and pass it to helper functions in one arg.
*/
struct manstate {
/* command line flags */
int all; /* -a: show all matches rather than first */
int cat; /* -c: do not use a pager */
char *conffile; /* -C: use alternate config file */
int how; /* -h: show SYNOPSIS only */
char *manpath; /* -M: alternate MANPATH */
char *addpath; /* -m: add these dirs to front of manpath */
char *pathsearch; /* -S: path of man must contain this string */
char *sectionname; /* -s: limit search to a given man section */
int where; /* -w: just show paths of all matching files */
/* important tags from the config file */
TAG *defaultpath; /* _default: default MANPATH */
TAG *subdirs; /* _subdir: default subdir search list */
TAG *suffixlist; /* _suffix: for files that can be cat()'d */
TAG *buildlist; /* _build: for files that must be built */
/* tags for internal use */
TAG *intmp; /* _intmp: tmp files we must cleanup */
TAG *missinglist; /* _missing: pages we couldn't find */
TAG *mymanpath; /* _new_path: final version of MANPATH */
TAG *section; /* <sec>: tag for m.sectionname */
/* other misc stuff */
const char *pager; /* pager to use */
size_t pagerlen; /* length of the above */
};
/*
* prototypes
*/
int main(int, char **);
static void build_page(char *, char **, struct manstate *);
static void cat(char *);
static const char *check_pager(const char *);
static int cleanup(void);
static void how(char *);
static void jump(char **, char *, char *);
static int manual(char *, struct manstate *, glob_t *);
static void onsig(int);
static void usage(void);
/*
* main function
*/
int
main(int argc, char **argv)
{
static struct manstate m = { 0 }; /* init to zero */
int ch, abs_section, found;
const char *machine;
ENTRY *esubd, *epath;
char *p, **ap, *cmd, buf[MAXPATHLEN * 2];
size_t len;
glob_t pg;
/*
* parse command line...
*/
while ((ch = getopt(argc, argv, "-aC:cfhkM:m:P:s:S:w")) != -1)
switch (ch) {
case 'a':
m.all = 1;
break;
case 'C':
m.conffile = optarg;
break;
case 'c':
case '-': /* XXX: '-' is a deprecated version of '-c' */
m.cat = 1;
break;
case 'h':
m.how = 1;
break;
case 'm':
m.addpath = optarg;
break;
case 'M':
case 'P': /* -P for backward compatibility */
m.manpath = strdup(optarg);
break;
/*
* The -f and -k options are backward compatible,
* undocumented ways of calling whatis(1) and apropos(1).
*/
case 'f':
jump(argv, "-f", "whatis");
/* NOTREACHED */
case 'k':
jump(argv, "-k", "apropos");
/* NOTREACHED */
case 's':
if (m.sectionname != NULL)
usage();
m.sectionname = optarg;
break;
case 'S':
m.pathsearch = optarg;
break;
case 'w':
m.all = m.where = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (!argc)
usage();
/*
* read the configuration file and collect any other information
* we will need (machine type, pager, section [if specified
* without '-s'], and MANPATH through the environment).
*/
config(m.conffile); /* exits on error ... */
if ((machine = getenv("MACHINE")) == NULL) {
struct utsname utsname;
if (uname(&utsname) == -1) {
perror("uname");
exit(1);
}
machine = utsname.machine;
}
if (!m.cat && !m.how && !m.where) { /* if we need a pager ... */
if (!isatty(STDOUT_FILENO)) {
m.cat = 1;
} else {
if ((m.pager = getenv("PAGER")) != NULL &&
m.pager[0] != '\0')
m.pager = check_pager(m.pager);
else
m.pager = _PATH_PAGER;
m.pagerlen = strlen(m.pager);
}
}
/* do we need to set m.section to a non-null value? */
if (m.sectionname) {
m.section = gettag(m.sectionname, 0); /* -s must be a section */
if (m.section == NULL)
errx(1, "unknown section: %s", m.sectionname);
} else if (argc > 1) {
m.section = gettag(*argv, 0); /* might be a section? */
if (m.section) {
argv++;
argc--;
}
}
if (m.manpath == NULL)
m.manpath = getenv("MANPATH"); /* note: -M overrides getenv */
/*
* get default values from config file, plus create the tags we
* use for keeping internal state. make sure all our mallocs
* go through.
*/
/* from cfg file */
m.defaultpath = gettag("_default", 1);
m.subdirs = gettag("_subdir", 1);
m.suffixlist = gettag("_suffix", 1);
m.buildlist = gettag("_build", 1);
/* internal use */
m.mymanpath = gettag("_new_path", 1);
m.missinglist = gettag("_missing", 1);
m.intmp = gettag("_intmp", 1);
if (!m.defaultpath || !m.subdirs || !m.suffixlist || !m.buildlist ||
!m.mymanpath || !m.missinglist || !m.intmp)
errx(1, "malloc failed");
/*
* are we using a section whose elements are all absolute paths?
* (we only need to look at the first entry on the section list,
* as config() will ensure that any additional entries will match
* the first one.)
*/
abs_section = (m.section != NULL &&
!TAILQ_EMPTY(&m.section->entrylist) &&
*(TAILQ_FIRST(&m.section->entrylist)->s) == '/');
/*
* now that we have all the data we need, we must determine the
* manpath we are going to use to find the requested entries using
* the following steps...
*
* [1] if the user specified a section and that section's elements
* from the config file are all absolute paths, then we override
* defaultpath and -M/MANPATH with the section's absolute paths.
*/
if (abs_section) {
m.manpath = NULL; /* ignore -M/MANPATH */
m.defaultpath = m.section; /* overwrite _default path */
m.section = NULL; /* promoted to defaultpath */
}
/*
* [2] section can now only be non-null if the user asked for
* a section and that section's elements did not have
* absolute paths. in this case we use the section's
* elements to override _subdir from the config file.
*
* after this step, we are done processing "m.section"...
*/
if (m.section)
m.subdirs = m.section;
/*
* [3] we need to setup the path we want to use (m.mymanpath).
* if the user gave us a path (m.manpath) use it, otherwise
* go with the default. in either case we need to append
* the subdir and machine spec to each element of the path.
*
* for absolute section paths that come from the config file,
* we only append the subdir spec if the path ends in
* a '/' --- elements that do not end in '/' are assumed to
* not have subdirectories. this is mainly for backward compat,
* but it allows non-subdir configs like:
* sect3 /usr/share/man/{old/,}cat3
* doc /usr/{pkg,share}/doc/{sendmail/op,sendmail/intro}
*
* note that we try and be careful to not put double slashes
* in the path (e.g. we want /usr/share/man/man1, not
* /usr/share/man//man1) because "more" will put the filename
* we generate in its prompt and the double slashes look ugly.
*/
if (m.manpath) {
/* note: strtok is going to destroy m.manpath */
for (p = strtok(m.manpath, ":") ; p ; p = strtok(NULL, ":")) {
len = strlen(p);
if (len < 1)
continue;
TAILQ_FOREACH(esubd, &m.subdirs->entrylist, q) {
snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
p, (p[len-1] == '/') ? "" : "/",
esubd->s, machine);
if (addentry(m.mymanpath, buf, 0) < 0)
errx(1, "malloc failed");
}
}
} else {
TAILQ_FOREACH(epath, &m.defaultpath->entrylist, q) {
/* handle trailing "/" magic here ... */
if (abs_section &&
epath->s[epath->len - 1] != '/') {
(void)snprintf(buf, sizeof(buf),
"%s{/%s,}", epath->s, machine);
if (addentry(m.mymanpath, buf, 0) < 0)
errx(1, "malloc failed");
continue;
}
TAILQ_FOREACH(esubd, &m.subdirs->entrylist, q) {
snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
epath->s,
(epath->s[epath->len-1] == '/') ? ""
: "/",
esubd->s, machine);
if (addentry(m.mymanpath, buf, 0) < 0)
errx(1, "malloc failed");
}
}
}
/*
* [4] finally, prepend the "-m" m.addpath to mymanpath if it
* was specified. subdirs and machine are always applied to
* m.addpath.
*/
if (m.addpath) {
/* note: strtok is going to destroy m.addpath */
for (p = strtok(m.addpath, ":") ; p ; p = strtok(NULL, ":")) {
len = strlen(p);
if (len < 1)
continue;
TAILQ_FOREACH(esubd, &m.subdirs->entrylist, q) {
snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
p, (p[len-1] == '/') ? "" : "/",
esubd->s, machine);
/* add at front */
if (addentry(m.mymanpath, buf, 1) < 0)
errx(1, "malloc failed");
}
}
}
/*
* now m.mymanpath is complete!
*/
#if MAN_DEBUG
printf("mymanpath:\n");
TAILQ_FOREACH(epath, &m.mymanpath->entrylist, q) {
printf("\t%s\n", epath->s);
}
#endif
/*
* start searching for matching files and format them if necessary.
* setup an interrupt handler so that we can ensure that temporary
* files go away.
*/
(void)signal(SIGINT, onsig);
(void)signal(SIGHUP, onsig);
(void)signal(SIGPIPE, onsig);
memset(&pg, 0, sizeof(pg));
for (found = 0; *argv; ++argv)
if (manual(*argv, &m, &pg)) {
found = 1;
}
/* if nothing found, we're done. */
if (!found) {
(void)cleanup();
exit (1);
}
/*
* handle the simple display cases first (m.cat, m.how, m.where)
*/
if (m.cat) {
for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
if (**ap == '\0')
continue;
cat(*ap);
}
exit (cleanup());
}
if (m.how) {
for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
if (**ap == '\0')
continue;
how(*ap);
}
exit(cleanup());
}
if (m.where) {
for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
if (**ap == '\0')
continue;
(void)printf("%s\n", *ap);
}
exit(cleanup());
}
/*
* normal case - we display things in a single command, so
* build a list of things to display. first compute total
* length of buffer we will need so we can malloc it.
*/
for (ap = pg.gl_pathv, len = m.pagerlen + 1; *ap != NULL; ++ap) {
if (**ap == '\0')
continue;
len += strlen(*ap) + 1;
}
if ((cmd = malloc(len)) == NULL) {
warn("malloc");
(void)cleanup();
exit(1);
}
/* now build the command string... */
p = cmd;
len = m.pagerlen;
memcpy(p, m.pager, len);
p += len;
*p++ = ' ';
for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
if (**ap == '\0')
continue;
len = strlen(*ap);
memcpy(p, *ap, len);
p += len;
*p++ = ' ';
}
*--p = '\0';
/* Use system(3) in case someone's pager is "pager arg1 arg2". */
(void)system(cmd);
exit(cleanup());
}
/*
* manual --
* Search the manuals for the pages.
*/
static int
manual(char *page, struct manstate *mp, glob_t *pg)
{
ENTRY *suffix, *mdir;
int anyfound, error, found;
size_t cnt;
char *p, buf[MAXPATHLEN], *escpage, *eptr;
static const char escglob[] = "\\~?*{}[]";
anyfound = 0;
/*
* Fixup page which may contain glob(3) special characters, e.g.
* the famous "No man page for [" FAQ.
*/
if ((escpage = malloc((2 * strlen(page)) + 1)) == NULL) {
warn("malloc");
(void)cleanup();
exit(1);
}
p = page;
eptr = escpage;
while (*p) {
if (strchr(escglob, *p) != NULL) {
*eptr++ = '\\';
*eptr++ = *p++;
} else
*eptr++ = *p++;
}
*eptr = '\0';
/* For each man directory in mymanpath ... */
TAILQ_FOREACH(mdir, &mp->mymanpath->entrylist, q) {
/*
* use glob(3) to look in the filesystem for matching files.
* match any suffix here, as we will check that later.
*/
(void)snprintf(buf, sizeof(buf), "%s/%s.*", mdir->s, escpage);
if ((error = glob(buf,
GLOB_APPEND | GLOB_BRACE | GLOB_NOSORT, NULL, pg)) != 0) {
if (error == GLOB_NOMATCH)
continue;
else {
warn("globbing");
(void)cleanup();
exit(1);
}
}
if (pg->gl_matchc == 0)
continue;
/*
* start going through the matches glob(3) just found and
* use m.pathsearch (if present) to filter out pages we
* don't want. then verify the suffix is valid, and build
* the page if we have a _build suffix.
*/
for (cnt = pg->gl_pathc - pg->gl_matchc;
cnt < pg->gl_pathc; ++cnt) {
/* filter on directory path name */
if (mp->pathsearch) {
p = strstr(pg->gl_pathv[cnt], mp->pathsearch);
if (!p || strchr(p, '/') == NULL) {
pg->gl_pathv[cnt] = ""; /* zap! */
continue;
}
}
/*
* Try the _suffix key words first.
*
* XXX
* Older versions of man.conf didn't have the suffix
* key words, it was assumed that everything was a .0.
* We just test for .0 first, it's fast and probably
* going to hit.
*/
(void)snprintf(buf, sizeof(buf), "*/%s.0", escpage);
if (!fnmatch(buf, pg->gl_pathv[cnt], 0))
goto next;
found = 0;
TAILQ_FOREACH(suffix, &mp->suffixlist->entrylist, q) {
(void)snprintf(buf,
sizeof(buf), "*/%s%s", escpage,
suffix->s);
if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) {
found = 1;
break;
}
}
if (found)
goto next;
/* Try the _build key words next. */
found = 0;
TAILQ_FOREACH(suffix, &mp->buildlist->entrylist, q) {
for (p = suffix->s;
*p != '\0' && !isspace((unsigned char)*p);
++p)
continue;
if (*p == '\0')
continue;
*p = '\0';
(void)snprintf(buf,
sizeof(buf), "*/%s%s", escpage,
suffix->s);
if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) {
if (!mp->where)
build_page(p + 1,
&pg->gl_pathv[cnt], mp);
*p = ' ';
found = 1;
break;
}
*p = ' ';
}
if (found) {
next: anyfound = 1;
if (!mp->all) {
/* Delete any other matches. */
while (++cnt< pg->gl_pathc)
pg->gl_pathv[cnt] = "";
break;
}
continue;
}
/* It's not a man page, forget about it. */
pg->gl_pathv[cnt] = "";
}
if (anyfound && !mp->all)
break;
}
/* If not found, enter onto the missing list. */
if (!anyfound) {
if (addentry(mp->missinglist, page, 0) < 0) {
warn("malloc");
(void)cleanup();
exit(1);
}
}
free(escpage);
return (anyfound);
}
/*
* build_page --
* Build a man page for display.
*/
static void
build_page(char *fmt, char **pathp, struct manstate *mp)
{
static int warned;
int olddir, fd, n, tmpdirlen;
char *p, *b;
char buf[MAXPATHLEN], cmd[MAXPATHLEN], tpath[MAXPATHLEN];
const char *tmpdir;
/* Let the user know this may take awhile. */
if (!warned) {
warned = 1;
warnx("Formatting manual page...");
}
/*
* Historically man chdir'd to the root of the man tree.
* This was used in man pages that contained relative ".so"
* directives (including other man pages for command aliases etc.)
* It even went one step farther, by examining the first line
* of the man page and parsing the .so filename so it would
* make hard(?) links to the cat'ted man pages for space savings.
* (We don't do that here, but we could).
*/
/* copy and find the end */
for (b = buf, p = *pathp; (*b++ = *p++) != '\0';)
continue;
/*
* skip the last two path components, page name and man[n] ...
* (e.g. buf will be "/usr/share/man" and p will be "man1/man.1")
* we also save a pointer to our current directory so that we
* can fchdir() back to it. this allows relative MANDIR paths
* to work with multiple man pages... e.g. consider:
* cd /usr/share && man -M ./man cat ls
* when no "cat1" subdir files are present.
*/
olddir = -1;
for (--b, --p, n = 2; b != buf; b--, p--)
if (*b == '/')
if (--n == 0) {
*b = '\0';
olddir = open(".", O_RDONLY);
(void) chdir(buf);
p++;
break;
}
/* advance fmt pass the suffix spec to the printf format string */
for (; *fmt && isspace((unsigned char)*fmt); ++fmt)
continue;
/*
* Get a temporary file and build a version of the file
* to display. Replace the old file name with the new one.
*/
if ((tmpdir = getenv("TMPDIR")) == NULL)
tmpdir = _PATH_TMP;
tmpdirlen = strlen(tmpdir);
(void)snprintf(tpath, sizeof (tpath), "%s%s%s", tmpdir,
(tmpdirlen && tmpdir[tmpdirlen-1] == '/') ? "" : "/", TMPFILE);
if ((fd = mkstemp(tpath)) == -1) {
warn("%s", tpath);
(void)cleanup();
exit(1);
}
(void)snprintf(buf, sizeof(buf), "%s > %s", fmt, tpath);
(void)snprintf(cmd, sizeof(cmd), buf, p);
(void)system(cmd);
(void)close(fd);
if ((*pathp = strdup(tpath)) == NULL) {
warn("malloc");
(void)cleanup();
exit(1);
}
/* Link the built file into the remove-when-done list. */
if (addentry(mp->intmp, *pathp, 0) < 0) {
warn("malloc");
(void)cleanup();
exit(1);
}
/* restore old directory so relative manpaths still work */
if (olddir != -1) {
fchdir(olddir);
close(olddir);
}
}
/*
* how --
* display how information
*/
static void
how(char *fname)
{
FILE *fp;
int lcnt, print;
char *p, buf[256];
if (!(fp = fopen(fname, "r"))) {
warn("%s", fname);
(void)cleanup();
exit (1);
}
#define S1 "SYNOPSIS"
#define S2 "S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS"
#define D1 "DESCRIPTION"
#define D2 "D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN"
for (lcnt = print = 0; fgets(buf, sizeof(buf), fp);) {
if (!strncmp(buf, S1, sizeof(S1) - 1) ||
!strncmp(buf, S2, sizeof(S2) - 1)) {
print = 1;
continue;
} else if (!strncmp(buf, D1, sizeof(D1) - 1) ||
!strncmp(buf, D2, sizeof(D2) - 1)) {
if (fp)
(void)fclose(fp);
return;
}
if (!print)
continue;
if (*buf == '\n')
++lcnt;
else {
for(; lcnt; --lcnt)
(void)putchar('\n');
for (p = buf; isspace((unsigned char)*p); ++p)
continue;
(void)fputs(p, stdout);
}
}
(void)fclose(fp);
}
/*
* cat --
* cat out the file
*/
static void
cat(char *fname)
{
int fd, n;
char buf[2048];
if ((fd = open(fname, O_RDONLY, 0)) < 0) {
warn("%s", fname);
(void)cleanup();
exit(1);
}
while ((n = read(fd, buf, sizeof(buf))) > 0)
if (write(STDOUT_FILENO, buf, n) != n) {
warn("write");
(void)cleanup();
exit (1);
}
if (n == -1) {
warn("read");
(void)cleanup();
exit(1);
}
(void)close(fd);
}
/*
* check_pager --
* check the user supplied page information
*/
static const char *
check_pager(const char *name)
{
const char *p;
/*
* if the user uses "more", we make it "more -s"; watch out for
* PAGER = "mypager /usr/ucb/more"
*/
for (p = name; *p && !isspace((unsigned char)*p); ++p)
continue;
for (; p > name && *p != '/'; --p);
if (p != name)
++p;
/* make sure it's "more", not "morex" */
if (!strncmp(p, "more", 4) && (!p[4] || isspace((unsigned char)p[4]))){
char *newname;
if(!(newname = malloc(strlen(p) + 20))) {
errx(1, "malloc failed");
}
(void)sprintf(newname, "%s %s", p, "-s");
name = newname;
}
return (name);
}
/*
* jump --
* strip out flag argument and jump
*/
static void
jump(char **argv, char *flag, char *name)
{
char **arg;
argv[0] = name;
for (arg = argv + 1; *arg; ++arg)
if (!strcmp(*arg, flag))
break;
for (; *arg; ++arg)
arg[0] = arg[1];
execvp(name, argv);
(void)fprintf(stderr, "%s: Command not found.\n", name);
exit(1);
}
/*
* onsig --
* If signaled, delete the temporary files.
*/
static void
onsig(int signo)
{
(void)cleanup();
#if 0
(void)raise_default_signal(signo);
#endif
/* NOTREACHED */
exit (1);
}
/*
* cleanup --
* Clean up temporary files, show any error messages.
*/
static int
cleanup()
{
TAG *intmpp, *missp;
ENTRY *ep;
int rval;
rval = 0;
/*
* note that _missing and _intmp were created by main(), so
* gettag() cannot return NULL here.
*/
missp = gettag("_missing", 0); /* missing man pages */
intmpp = gettag("_intmp", 0); /* tmp files we need to unlink */
TAILQ_FOREACH(ep, &missp->entrylist, q) {
warnx("no entry for %s in the manual.", ep->s);
rval = 1;
}
TAILQ_FOREACH(ep, &intmpp->entrylist, q)
(void)unlink(ep->s);
return (rval);
}
/*
* usage --
* print usage message and die
*/
static void
usage()
{
(void)fprintf(stderr, "usage: %s [-acw|-h] [-C cfg] [-M path] "
"[-m path] [-S srch] [[-s] sect] name ...\n", getprogname());
(void)fprintf(stderr,
"usage: %s -k [-C cfg] [-M path] [-m path] keyword ...\n",
getprogname());
exit(1);
}
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