Mercurial > hg > mlmmj
changeset 488:1a2f00c5b2e9
forgot the readn.c
author | mmj |
---|---|
date | Tue, 03 May 2005 04:20:15 +1000 |
parents | cecbb0d77eb2 |
children | e0922d603706 |
files | src/readn.c |
diffstat | 1 files changed, 52 insertions(+), 0 deletions(-) [+] |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/readn.c Tue May 03 04:20:15 2005 +1000 @@ -0,0 +1,52 @@ +/* Copyright (C) 2005 Mads Martin Joergensen <mmj at mmj.dk> + * + * $Id$ + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to + * deal in the Software without restriction, including without limitation the + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#include <unistd.h> +#include <errno.h> + +#include "wrappers.h" + +/* classic read wrapper from Stevens */ +ssize_t readn(int fd, void *vptr, size_t n) +{ + size_t nleft; + ssize_t nread; + char *ptr; + + ptr = vptr; + nleft = n; + while(nleft > 0) { + if((nread = read(fd, ptr, nleft)) < 0) { + if(errno == EINTR) + nread = 0; /* and call read() again */ + else + return -1; /* Caller can check errno */ + } else if (nread == 0) + break; /* EOF */ + + nleft -= nread; + ptr += nread; + } + return n - nleft; /* return >= 0 */ +} +