208 lines
6.1 KiB
C
208 lines
6.1 KiB
C
/* $Header: /src/pub/tcsh/tw.help.c,v 3.17 2000/01/14 22:57:30 christos Exp $ */
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/* tw.help.c: actually look up and print documentation on a file.
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* Look down the path for an appropriate file, then print it.
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* Note that the printing is NOT PAGED. This is because the
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* function is NOT meant to look at manual pages, it only does so
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* if there is no .help file to look in.
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*/
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/*-
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* Copyright (c) 1980, 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "sh.h"
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RCSID("$Id: tw.help.c,v 3.17 2000/01/14 22:57:30 christos Exp $")
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#include "tw.h"
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#include "tc.h"
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static int f = -1;
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static sigret_t cleanf __P((int));
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static Char *skipslist __P((Char *));
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static void nextslist __P((Char *, Char *));
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static char *h_ext[] = {
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".help", ".1", ".8", ".6", "", NULL
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};
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void
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do_help(command)
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Char *command;
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{
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Char name[FILSIZ + 1];
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Char *cmd_p, *ep;
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char **sp;
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signalfun_t orig_intr;
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Char curdir[MAXPATHLEN]; /* Current directory being looked at */
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register Char *hpath; /* The environment parameter */
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Char full[MAXPATHLEN];
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char buf[512]; /* full path name and buffer for read */
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int len; /* length of read buffer */
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Char *thpath;
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/* trim off the whitespace at the beginning */
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for (cmd_p = command; *cmd_p == ' ' || *cmd_p == '\t'; cmd_p++)
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continue;
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/* copy the string to a safe place */
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copyn(name, cmd_p, FILSIZ + 1);
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/* trim off the whitespace that may be at the end */
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for (cmd_p = name;
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*cmd_p != ' ' && *cmd_p != '\t' && *cmd_p != '\0'; cmd_p++)
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continue;
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*cmd_p = '\0';
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/* if nothing left, return */
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if (*name == '\0')
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return;
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if (adrof1(STRhelpcommand, &aliases)) { /* if we have an alias */
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jmp_buf_t osetexit;
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getexit(osetexit); /* make sure to come back here */
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if (setexit() == 0)
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aliasrun(2, STRhelpcommand, name); /* then use it. */
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resexit(osetexit); /* and finish up */
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}
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else { /* else cat something to them */
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/* got is, now "cat" the file based on the path $HPATH */
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hpath = str2short(getenv(SEARCHLIST));
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if (hpath == NULL)
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hpath = str2short(DEFAULTLIST);
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thpath = hpath = Strsave(hpath);
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for (;;) {
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if (!*hpath) {
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xprintf(CGETS(29, 1, "No help file for %S\n"), name);
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break;
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}
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nextslist(hpath, curdir);
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hpath = skipslist(hpath);
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/*
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* now make the full path name - try first /bar/foo.help, then
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* /bar/foo.1, /bar/foo.8, then finally /bar/foo.6. This is so
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* that you don't spit a binary at the tty when $HPATH == $PATH.
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*/
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copyn(full, curdir, (int) (sizeof(full) / sizeof(Char)));
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catn(full, STRslash, (int) (sizeof(full) / sizeof(Char)));
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catn(full, name, (int) (sizeof(full) / sizeof(Char)));
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ep = &full[Strlen(full)];
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for (sp = h_ext; *sp; sp++) {
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*ep = '\0';
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catn(full, str2short(*sp), (int) (sizeof(full) / sizeof(Char)));
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if ((f = open(short2str(full), O_RDONLY)) != -1)
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break;
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}
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if (f != -1) {
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/* so cat it to the terminal */
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orig_intr = (signalfun_t) sigset(SIGINT, cleanf);
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while (f != -1 && (len = read(f, (char *) buf, 512)) > 0)
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(void) write(SHOUT, (char *) buf, (size_t) len);
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#ifdef convex
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/* print error in case file is migrated */
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if (len == -1)
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stderror(ERR_SYSTEM, progname, strerror(errno));
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#endif /* convex */
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(void) sigset(SIGINT, orig_intr);
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if (f != -1)
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(void) close(f);
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break;
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}
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}
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xfree((ptr_t) thpath);
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}
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}
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static sigret_t
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/*ARGSUSED*/
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cleanf(snum)
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int snum;
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{
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USE(snum);
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#ifdef UNRELSIGS
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if (snum)
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(void) sigset(SIGINT, cleanf);
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#endif /* UNRELSIGS */
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if (f != -1)
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(void) close(f);
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f = -1;
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#ifndef SIGVOID
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return (snum);
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#endif
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}
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/* these next two are stolen from CMU's man(1) command for looking down
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* paths. they are prety straight forward. */
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/*
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* nextslist takes a search list and copies the next path in it
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* to np. A null search list entry is expanded to ".".
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* If there are no entries in the search list, then np will point
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* to a null string.
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*/
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static void
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nextslist(sl, np)
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register Char *sl;
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register Char *np;
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{
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if (!*sl)
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*np = '\000';
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else if (*sl == ':') {
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*np++ = '.';
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*np = '\000';
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}
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else {
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while (*sl && *sl != ':')
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*np++ = *sl++;
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*np = '\000';
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}
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}
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/*
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* skipslist returns the pointer to the next entry in the search list.
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*/
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static Char *
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skipslist(sl)
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register Char *sl;
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{
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while (*sl && *sl++ != ':')
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continue;
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return (sl);
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}
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