1 /* vi: set sw=4 ts=4: */ 2 /* 3 * Utility routines. 4 * 5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22 #include <stdio.h> 23 #include <unistd.h> 24 #include <errno.h> 25 #include "libbb.h" 26 27 extern void archive_xread_all(int fd, char *buf, size_t count) 28 { 29 ssize_t size; 30 31 size = full_read(fd, buf, count); 32 if (size != count) { 33 perror_msg_and_die("Short read"); 34 } 35 return; 36 } 37 38 /* 39 * Read all of the supplied buffer from a file. 40 * This does multiple reads as necessary. 41 * Returns the amount read, or -1 on an error. 42 * A short read is returned on an end of file. 43 */ 44 ssize_t full_read(int fd, char *buf, int len) 45 { 46 ssize_t cc; 47 ssize_t total; 48 49 total = 0; 50 51 while (len > 0) { 52 cc = safe_read(fd, buf, len); 53 54 if (cc < 0) 55 return cc; /* read() returns -1 on failure. */ 56 57 if (cc == 0) 58 break; 59 60 buf = ((char *)buf) + cc; 61 total += cc; 62 len -= cc; 63 } 64 65 return total; 66 } 67 68 ssize_t safe_read(int fd, void *buf, size_t count) 69 { 70 ssize_t n; 71 72 do { 73 n = read(fd, buf, count); 74 } while (n < 0 && errno == EINTR); 75 76 return n; 77 } 78 79 /* END CODE */ 80
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