usr.bin/find/find.c

   1 /*-
   2  * Copyright (c) 1991, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Cimarron D. Taylor of the University of California, Berkeley.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)find.c   8.5 (Berkeley) 8/5/94
  37  * $FreeBSD: src/usr.bin/find/find.c,v 1.17 2004/05/28 17:17:15 eik Exp $
  38  * $DragonFly: src/usr.bin/find/find.c,v 1.6 2005/02/14 20:31:59 cpressey Exp $
  39  */
  40
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <fts.h>
  47 #include <regex.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51
  52 #include "find.h"
  53
  54 static int find_compare(const FTSENT **s1, const FTSENT **s2);
  55
  56 /*
  57  * find_compare --
  58  *      tell fts_open() how to order the traversal of the hierarchy.
  59  *      This variant gives lexicographical order, i.e., alphabetical
  60  *      order within each directory.
  61  */
  62 static int
  63 find_compare(const FTSENT **s1, const FTSENT **s2)
  64 {
  65
  66         return (strcoll((*s1)->fts_name, (*s2)->fts_name));
  67 }
  68
  69 /*
  70  * find_formplan --
  71  *      process the command line and create a "plan" corresponding to the
  72  *      command arguments.
  73  */
  74 PLAN *
  75 find_formplan(char *argv[])
  76 {
  77         PLAN *plan, *tail, *new;
  78
  79         /*
  80          * for each argument in the command line, determine what kind of node
  81          * it is, create the appropriate node type and add the new plan node
  82          * to the end of the existing plan.  The resulting plan is a linked
  83          * list of plan nodes.  For example, the string:
  84          *
  85          *      % find . -name foo -newer bar -print
  86          *
  87          * results in the plan:
  88          *
  89          *      [-name foo]--> [-newer bar]--> [-print]
  90          *
  91          * in this diagram, `[-name foo]' represents the plan node generated
  92          * by c_name() with an argument of foo and `-->' represents the
  93          * plan->next pointer.
  94          */
  95         for (plan = tail = NULL; *argv;) {
  96                 if (!(new = find_create(&argv)))
  97                         continue;
  98                 if (plan == NULL)
  99                         tail = plan = new;
 100                 else {
 101                         tail->next = new;
 102                         tail = new;
 103                 }
 104         }
 105
 106         /*
 107          * if the user didn't specify one of -print, -ok or -exec, then -print
 108          * is assumed so we bracket the current expression with parens, if
 109          * necessary, and add a -print node on the end.
 110          */
 111         if (!isoutput) {
 112                 OPTION *p;
 113                 char **argv1 = 0;
 114
 115                 if (plan == NULL) {
 116                         p = lookup_option("-print");
 117                         new = (p->create)(p, &argv1);
 118                         tail = plan = new;
 119                 } else {
 120                         p = lookup_option("(");
 121                         new = (p->create)(p, &argv1);
 122                         new->next = plan;
 123                         plan = new;
 124                         p = lookup_option(")");
 125                         new = (p->create)(p, &argv1);
 126                         tail->next = new;
 127                         tail = new;
 128                         p = lookup_option("-print");
 129                         new = (p->create)(p, &argv1);
 130                         tail->next = new;
 131                         tail = new;
 132                 }
 133         }
 134
 135         /*
 136          * the command line has been completely processed into a search plan
 137          * except for the (, ), !, and -o operators.  Rearrange the plan so
 138          * that the portions of the plan which are affected by the operators
 139          * are moved into operator nodes themselves.  For example:
 140          *
 141          *      [!]--> [-name foo]--> [-print]
 142          *
 143          * becomes
 144          *
 145          *      [! [-name foo] ]--> [-print]
 146          *
 147          * and
 148          *
 149          *      [(]--> [-depth]--> [-name foo]--> [)]--> [-print]
 150          *
 151          * becomes
 152          *
 153          *      [expr [-depth]-->[-name foo] ]--> [-print]
 154          *
 155          * operators are handled in order of precedence.
 156          */
 157
 158         plan = paren_squish(plan);              /* ()'s */
 159         plan = not_squish(plan);                /* !'s */
 160         plan = or_squish(plan);                 /* -o's */
 161         return (plan);
 162 }
 163
 164 FTS *tree;                      /* pointer to top of FTS hierarchy */
 165
 166 /*
 167  * find_execute --
 168  *      take a search plan and an array of search paths and executes the plan
 169  *      over all FTSENT's returned for the given search paths.
 170  */
 171 int
 172 find_execute(PLAN *plan, char *paths[])
 173 {
 174         FTSENT *entry;
 175         PLAN *p;
 176         int rval;
 177
 178         tree = fts_open(paths, ftsoptions, issort ? find_compare : NULL);
 179         if (tree == NULL)
 180                 err(1, "ftsopen");
 181
 182         for (rval = 0; (entry = fts_read(tree)) != NULL;) {
 183                 if (maxdepth != -1 && entry->fts_level >= maxdepth) {
 184                         if (fts_set(tree, entry, FTS_SKIP))
 185                                 err(1, "%s", entry->fts_path);
 186                 }
 187
 188                 switch (entry->fts_info) {
 189                 case FTS_D:
 190                         if (isdepth)
 191                                 continue;
 192                         break;
 193                 case FTS_DP:
 194                         if (!isdepth)
 195                                 continue;
 196                         break;
 197                 case FTS_DNR:
 198                 case FTS_ERR:
 199                 case FTS_NS:
 200                         fflush(stdout);
 201                         warnx("%s: %s",
 202                             entry->fts_path, strerror(entry->fts_errno));
 203                         rval = 1;
 204                         continue;
 205 #ifdef FTS_W
 206                 case FTS_W:
 207                         continue;
 208 #endif /* FTS_W */
 209                 }
 210 #define BADCH   " \t\n\\'\""
 211                 if (isxargs && strpbrk(entry->fts_path, BADCH)) {
 212                         fflush(stdout);
 213                         warnx("%s: illegal path", entry->fts_path);
 214                         rval = 1;
 215                         continue;
 216                 }
 217
 218                 if (mindepth != -1 && entry->fts_level < mindepth)
 219                         continue;
 220
 221                 /*
 222                  * Call all the functions in the execution plan until one is
 223                  * false or all have been executed.  This is where we do all
 224                  * the work specified by the user on the command line.
 225                  */
 226                 for (p = plan; p && (p->execute)(p, entry); p = p->next);
 227         }
 228         /* Finish any pending -exec ... {} + functions. */
 229         for (p = plan; p != NULL; p = p->next)
 230                 if (p->execute == f_exec && p->flags & F_EXECPLUS)
 231                         (p->execute)(p, NULL);
 232         if (errno)
 233                 err(1, "fts_read");
 234         return (rval);
 235 }