NetBSD-5.0.2/usr.bin/find/find.c
/* $NetBSD: find.c,v 1.25 2007/09/25 04:10:12 lukem Exp $ */
/*-
* Copyright (c) 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Cimarron D. Taylor of the University of California, Berkeley.
*
* 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>
#ifndef lint
#if 0
static char sccsid[] = "from: @(#)find.c 8.5 (Berkeley) 8/5/94";
#else
__RCSID("$NetBSD: find.c,v 1.25 2007/09/25 04:10:12 lukem Exp $");
#endif
#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fts.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "find.h"
static int ftscompare(const FTSENT **, const FTSENT **);
static void sig_lock(sigset_t *);
static void sig_unlock(const sigset_t *);
/*
* find_formplan --
* process the command line and create a "plan" corresponding to the
* command arguments.
*/
PLAN *
find_formplan(char **argv)
{
PLAN *plan, *tail, *new;
/*
* for each argument in the command line, determine what kind of node
* it is, create the appropriate node type and add the new plan node
* to the end of the existing plan. The resulting plan is a linked
* list of plan nodes. For example, the string:
*
* % find . -name foo -newer bar -print
*
* results in the plan:
*
* [-name foo]--> [-newer bar]--> [-print]
*
* in this diagram, `[-name foo]' represents the plan node generated
* by c_name() with an argument of foo and `-->' represents the
* plan->next pointer.
*/
for (plan = tail = NULL; *argv;) {
if (!(new = find_create(&argv)))
continue;
if (plan == NULL)
tail = plan = new;
else {
tail->next = new;
tail = new;
}
}
/*
* if the user didn't specify one of -print, -ok, -fprint, -exec, or
* -exit, then -print is assumed so we bracket the current expression
* with parens, if necessary, and add a -print node on the end.
*/
if (!isoutput) {
if (plan == NULL) {
new = c_print(NULL, 0);
tail = plan = new;
} else {
new = c_openparen(NULL, 0);
new->next = plan;
plan = new;
new = c_closeparen(NULL, 0);
tail->next = new;
tail = new;
new = c_print(NULL, 0);
tail->next = new;
tail = new;
}
}
/*
* the command line has been completely processed into a search plan
* except for the (, ), !, and -o operators. Rearrange the plan so
* that the portions of the plan which are affected by the operators
* are moved into operator nodes themselves. For example:
*
* [!]--> [-name foo]--> [-print]
*
* becomes
*
* [! [-name foo] ]--> [-print]
*
* and
*
* [(]--> [-depth]--> [-name foo]--> [)]--> [-print]
*
* becomes
*
* [expr [-depth]-->[-name foo] ]--> [-print]
*
* operators are handled in order of precedence.
*/
plan = paren_squish(plan); /* ()'s */
plan = not_squish(plan); /* !'s */
plan = or_squish(plan); /* -o's */
return (plan);
}
static int
ftscompare(const FTSENT **e1, const FTSENT **e2)
{
return (strcoll((*e1)->fts_name, (*e2)->fts_name));
}
static void
sig_lock(sigset_t *s)
{
sigset_t new;
sigemptyset(&new);
sigaddset(&new, SIGINFO); /* block SIGINFO */
sigprocmask(SIG_BLOCK, &new, s);
}
static void
sig_unlock(const sigset_t *s)
{
sigprocmask(SIG_SETMASK, s, NULL);
}
FTS *tree; /* pointer to top of FTS hierarchy */
FTSENT *g_entry; /* shared with SIGINFO handler */
/*
* find_execute --
* take a search plan and an array of search paths and executes the plan
* over all FTSENT's returned for the given search paths.
*/
int
find_execute(PLAN *plan, char **paths)
{
PLAN *p;
int r, rval, cval;
sigset_t s;
cval = 1;
if (!(tree = fts_open(paths, ftsoptions, issort ? ftscompare : NULL)))
err(1, "ftsopen");
sig_lock(&s);
for (rval = 0; cval && (g_entry = fts_read(tree)) != NULL; sig_lock(&s)) {
sig_unlock(&s);
switch (g_entry->fts_info) {
case FTS_D:
if (isdepth)
continue;
break;
case FTS_DP:
if (!isdepth)
continue;
break;
case FTS_DNR:
case FTS_ERR:
case FTS_NS:
(void)fflush(stdout);
warnx("%s: %s",
g_entry->fts_path, strerror(g_entry->fts_errno));
rval = 1;
continue;
}
#define BADCH " \t\n\\'\""
if (isxargs && strpbrk(g_entry->fts_path, BADCH)) {
(void)fflush(stdout);
warnx("%s: illegal path", g_entry->fts_path);
rval = 1;
continue;
}
/*
* Call all the functions in the execution plan until one is
* false or all have been executed. This is where we do all
* the work specified by the user on the command line.
*/
for (p = plan; p && (p->eval)(p, g_entry); p = p->next)
if (p->type == N_EXIT) {
rval = p->exit_val;
cval = 0;
}
}
sig_unlock(&s);
if (errno)
err(1, "fts_read");
(void)fts_close(tree);
/*
* Cleanup any plans with leftover state.
* Keep the last non-zero return value.
*/
if ((r = find_traverse(plan, plan_cleanup, NULL)) != 0)
rval = r;
return (rval);
}
/*
* find_traverse --
* traverse the plan tree and execute func() on all plans. This
* does not evaluate each plan's eval() function; it is intended
* for operations that must run on all plans, such as state
* cleanup.
*
* If any func() returns non-zero, then so will find_traverse().
*/
int
find_traverse(plan, func, arg)
PLAN *plan;
int (*func)(PLAN *, void *);
void *arg;
{
PLAN *p;
int r, rval;
rval = 0;
for (p = plan; p; p = p->next) {
if ((r = func(p, arg)) != 0)
rval = r;
if (p->type == N_EXPR || p->type == N_OR) {
if (p->p_data[0])
if ((r = find_traverse(p->p_data[0],
func, arg)) != 0)
rval = r;
if (p->p_data[1])
if ((r = find_traverse(p->p_data[1],
func, arg)) != 0)
rval = r;
}
}
return rval;
}