344 lines
7.6 KiB
C
344 lines
7.6 KiB
C
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/*
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* readdir.c --- Provide an input parser to read directories
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*
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* Arnold Robbins
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* arnold@skeeve.com
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* Written 7/2012
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*
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* Andrew Schorr and Arnold Robbins: further fixes 8/2012.
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* Simplified 11/2012.
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* Improved 3/2019.
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*/
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/*
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* Copyright (C) 2012-2014, 2017, 2018, 2019 the Free Software Foundation, Inc.
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*
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* This file is part of GAWK, the GNU implementation of the
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* AWK Programming Language.
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*
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* GAWK is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GAWK is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#define _BSD_SOURCE
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#ifdef HAVE_DIRENT_H
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#include <dirent.h>
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#else
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#error Cannot compile the readdir extension on this system!
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#endif
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#ifdef __MINGW32__
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#endif
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#include "gawkapi.h"
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#include "gawkdirfd.h"
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#include "gettext.h"
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#define _(msgid) gettext(msgid)
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#define N_(msgid) msgid
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#ifndef PATH_MAX
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#define PATH_MAX 1024 /* a good guess */
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#endif
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static const gawk_api_t *api; /* for convenience macros to work */
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static awk_ext_id_t ext_id;
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static const char *ext_version = "readdir extension: version 3.0";
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static awk_bool_t init_readdir(void);
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static awk_bool_t (*init_func)(void) = init_readdir;
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int plugin_is_GPL_compatible;
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/* data type for the opaque pointer: */
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typedef struct open_directory {
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DIR *dp;
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char *buf;
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union {
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awk_fieldwidth_info_t fw;
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char buf[awk_fieldwidth_info_size(3)];
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} u;
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} open_directory_t;
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#define fw u.fw
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/* ftype --- return type of file as a single character string */
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static const char *
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ftype(struct dirent *entry, const char *dirname)
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{
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#ifdef DT_BLK
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(void) dirname; /* silence warnings */
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switch (entry->d_type) {
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case DT_BLK: return "b";
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case DT_CHR: return "c";
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case DT_DIR: return "d";
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case DT_FIFO: return "p";
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case DT_LNK: return "l";
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case DT_REG: return "f";
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case DT_SOCK: return "s";
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default:
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case DT_UNKNOWN: break; // JFS returns 'u', so fall through to stat
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}
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#endif
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char fname[PATH_MAX];
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struct stat sbuf;
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strcpy(fname, dirname);
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strcat(fname, "/");
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strcat(fname, entry->d_name);
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if (stat(fname, &sbuf) == 0) {
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if (S_ISBLK(sbuf.st_mode))
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return "b";
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if (S_ISCHR(sbuf.st_mode))
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return "c";
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if (S_ISDIR(sbuf.st_mode))
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return "d";
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if (S_ISFIFO(sbuf.st_mode))
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return "p";
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if (S_ISREG(sbuf.st_mode))
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return "f";
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#ifdef S_ISLNK
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if (S_ISLNK(sbuf.st_mode))
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return "l";
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#endif
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#ifdef S_ISSOCK
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if (S_ISSOCK(sbuf.st_mode))
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return "s";
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#endif
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}
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return "u";
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}
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/* get_inode --- get the inode of a file */
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static long long
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get_inode(struct dirent *entry, const char *dirname)
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{
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#ifdef __MINGW32__
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char fname[PATH_MAX];
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HANDLE fh;
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BY_HANDLE_FILE_INFORMATION info;
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sprintf(fname, "%s\\%s", dirname, entry->d_name);
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fh = CreateFile(fname, 0, 0, NULL, OPEN_EXISTING,
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FILE_FLAG_BACKUP_SEMANTICS, NULL);
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if (fh == INVALID_HANDLE_VALUE)
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return 0;
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if (GetFileInformationByHandle(fh, &info)) {
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long long inode = info.nFileIndexHigh;
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inode <<= 32;
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inode += info.nFileIndexLow;
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return inode;
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}
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return 0;
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#else
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(void) dirname; /* silence warnings */
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return entry->d_ino;
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#endif
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}
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/* dir_get_record --- get one record at a time out of a directory */
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static int
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dir_get_record(char **out, awk_input_buf_t *iobuf, int *errcode,
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char **rt_start, size_t *rt_len,
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const awk_fieldwidth_info_t **field_width)
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{
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DIR *dp;
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struct dirent *dirent;
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int len, flen;
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open_directory_t *the_dir;
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const char *ftstr;
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unsigned long long ino;
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/*
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* The caller sets *errcode to 0, so we should set it only if an
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* error occurs.
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*/
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if (out == NULL || iobuf == NULL || iobuf->opaque == NULL)
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return EOF;
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the_dir = (open_directory_t *) iobuf->opaque;
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dp = the_dir->dp;
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/*
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* Initialize errno, since readdir does not set it to zero on EOF.
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*/
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errno = 0;
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dirent = readdir(dp);
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if (dirent == NULL) {
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*errcode = errno; /* in case there was an error */
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return EOF;
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}
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ino = get_inode(dirent, iobuf->name);
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#if __MINGW32__
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len = sprintf(the_dir->buf, "%I64u", ino);
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#else
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len = sprintf(the_dir->buf, "%llu", ino);
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#endif
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the_dir->fw.fields[0].len = len;
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len += (flen = sprintf(the_dir->buf + len, "/%s", dirent->d_name));
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the_dir->fw.fields[1].len = flen-1;
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ftstr = ftype(dirent, iobuf->name);
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len += (flen = sprintf(the_dir->buf + len, "/%s", ftstr));
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the_dir->fw.fields[2].len = flen-1;
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*out = the_dir->buf;
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*rt_start = NULL;
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*rt_len = 0; /* set RT to "" */
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if (field_width)
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*field_width = & the_dir->fw;
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return len;
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}
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/* dir_close --- close up when done */
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static void
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dir_close(awk_input_buf_t *iobuf)
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{
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open_directory_t *the_dir;
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if (iobuf == NULL || iobuf->opaque == NULL)
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return;
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the_dir = (open_directory_t *) iobuf->opaque;
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closedir(the_dir->dp);
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gawk_free(the_dir->buf);
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gawk_free(the_dir);
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iobuf->fd = -1;
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}
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/* dir_can_take_file --- return true if we want the file */
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static awk_bool_t
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dir_can_take_file(const awk_input_buf_t *iobuf)
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{
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if (iobuf == NULL)
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return awk_false;
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return (iobuf->fd != INVALID_HANDLE && S_ISDIR(iobuf->sbuf.st_mode));
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}
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/*
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* dir_take_control_of --- set up input parser.
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* We can assume that dir_can_take_file just returned true,
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* and no state has changed since then.
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*/
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static awk_bool_t
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dir_take_control_of(awk_input_buf_t *iobuf)
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{
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DIR *dp;
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open_directory_t *the_dir;
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size_t size;
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errno = 0;
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#ifdef HAVE_FDOPENDIR
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dp = fdopendir(iobuf->fd);
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#else
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dp = opendir(iobuf->name);
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if (dp != NULL)
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iobuf->fd = dirfd(dp);
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#endif
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if (dp == NULL) {
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warning(ext_id, _("dir_take_control_of: opendir/fdopendir failed: %s"),
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strerror(errno));
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update_ERRNO_int(errno);
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return awk_false;
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}
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emalloc(the_dir, open_directory_t *, sizeof(open_directory_t), "dir_take_control_of");
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the_dir->dp = dp;
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/* pre-populate the field_width struct with constant values: */
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the_dir->fw.use_chars = awk_false;
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the_dir->fw.nf = 3;
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the_dir->fw.fields[0].skip = 0; /* no leading space */
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the_dir->fw.fields[1].skip = 1; /* single '/' separator */
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the_dir->fw.fields[2].skip = 1; /* single '/' separator */
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size = sizeof(struct dirent) + 21 /* max digits in inode */ + 2 /* slashes */;
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emalloc(the_dir->buf, char *, size, "dir_take_control_of");
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iobuf->opaque = the_dir;
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iobuf->get_record = dir_get_record;
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iobuf->close_func = dir_close;
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return awk_true;
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}
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static awk_input_parser_t readdir_parser = {
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"readdir",
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dir_can_take_file,
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dir_take_control_of,
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NULL
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};
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#ifdef TEST_DUPLICATE
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static awk_input_parser_t readdir_parser2 = {
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"readdir2",
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dir_can_take_file,
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dir_take_control_of,
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NULL
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};
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#endif
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/* init_readdir --- set things ups */
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static awk_bool_t
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init_readdir()
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{
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register_input_parser(& readdir_parser);
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#ifdef TEST_DUPLICATE
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register_input_parser(& readdir_parser2);
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#endif
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return awk_true;
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}
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static awk_ext_func_t func_table[] = {
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{ NULL, NULL, 0, 0, awk_false, NULL }
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};
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/* define the dl_load function using the boilerplate macro */
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dl_load_func(func_table, readdir, "")
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