1 /* vi: set sw=4 ts=4: */ 2 /* 3 * Utility routines. 4 * 5 * Copyright (C) many different people. If you wrote this, please 6 * acknowledge your work. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 21 * USA 22 */ 23 24 #include <stdio.h> 25 #include <sys/stat.h> 26 #include "libbb.h" 27 28 /* Copy CHUNKSIZE bytes (or until EOF if CHUNKSIZE equals -1) from SRC_FILE 29 * to DST_FILE. */ 30 extern int copy_file_chunk(FILE * src_file, FILE * dst_file, 31 unsigned long long chunksize) 32 { 33 size_t nread, nwritten, size; 34 char buffer[BUFSIZ]; 35 36 while (chunksize != 0) { 37 if (chunksize > BUFSIZ) 38 size = BUFSIZ; 39 else 40 size = chunksize; 41 42 nread = fread(buffer, 1, size, src_file); 43 44 if (nread != size && ferror(src_file)) { 45 perror_msg("read"); 46 return -1; 47 } else if (nread == 0) { 48 if (chunksize != -1) { 49 error_msg("Unable to read all data"); 50 return -1; 51 } 52 53 return 0; 54 } 55 56 nwritten = fwrite(buffer, 1, nread, dst_file); 57 58 if (nwritten != nread) { 59 if (ferror(dst_file)) 60 perror_msg("write"); 61 else 62 error_msg("Unable to write all data"); 63 return -1; 64 } 65 66 if (chunksize != -1) 67 chunksize -= nwritten; 68 } 69 70 return 0; 71 } 72
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