52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
//****************************************************************************
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//
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// RVDDT (RISC-V Dynamic Debugging Tool)
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//
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// Copyright (C) 2020 John Winans
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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// USA
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//
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//****************************************************************************
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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#include "saferead.h"
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/**
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* read len bytes or die trying
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*****************************************************************/
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ssize_t saferead(int fd, char *buf, ssize_t want)
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{
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ssize_t got = 0;
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while (got < want)
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{
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ssize_t len = read(fd, &buf[got], want);
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if (len == -1)
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return -1;
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if (len == 0)
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break;
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got += len;
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want -= len;
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}
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return got;
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}
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