ib_read.c (1486B)
1 /* 2 * Copyright (c) 2003 Gunnar Ritter 3 * 4 * This software is provided 'as-is', without any express or implied 5 * warranty. In no event will the authors be held liable for any damages 6 * arising from the use of this software. 7 * 8 * Permission is granted to anyone to use this software for any purpose, 9 * including commercial applications, and to alter it and redistribute 10 * it freely, subject to the following restrictions: 11 * 12 * 1. The origin of this software must not be misrepresented; you must not 13 * claim that you wrote the original software. If you use this software 14 * in a product, an acknowledgment in the product documentation would be 15 * appreciated but is not required. 16 * 17 * 2. Altered source versions must be plainly marked as such, and must not be 18 * misrepresented as being the original software. 19 * 20 * 3. This notice may not be removed or altered from any source distribution. 21 */ 22 /* Sccsid @(#)ib_read.c 1.2 (gritter) 4/17/03 */ 23 24 #include <sys/types.h> 25 #include <sys/stat.h> 26 #include <fcntl.h> 27 #include <unistd.h> 28 #include <string.h> 29 #include <errno.h> 30 #include <stdlib.h> 31 32 #include "iblok.h" 33 34 int 35 ib_read(struct iblok *ip) 36 { 37 ssize_t sz; 38 39 do { 40 if ((sz = read(ip->ib_fd, ip->ib_blk, ip->ib_blksize)) > 0) { 41 ip->ib_endoff += sz; 42 ip->ib_cur = ip->ib_blk; 43 ip->ib_end = &ip->ib_blk[sz]; 44 return *ip->ib_cur++ & 0377; 45 } 46 } while (sz < 0 && errno == EINTR); 47 if (sz < 0) 48 ip->ib_errno = errno; 49 ip->ib_cur = ip->ib_end = NULL; 50 return EOF; 51 }