Mercurial > hg > mlmmj
view src/readn.c @ 919:e371a935a0cd default tip master
Added tag RELEASE_1_3_0 for changeset 570dd6d4942b
author | Ben Schmidt |
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date | Thu, 25 May 2017 09:08:47 +1000 |
parents | 1a2f00c5b2e9 |
children |
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/* 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 */ }