70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
/* _rename.c -- Implementation of the low-level rename() routine
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*
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* Copyright (c) 2004 National Semiconductor Corporation
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <alloca.h>
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#include <errno.h>
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int _rename (char *from, char *to)
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{
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void* buf;
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int f_from;
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int f_to;
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int size;
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f_from = open(from,O_RDONLY);
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if (f_from < 0)
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{
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errno = ENOENT;
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return -1;
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};
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f_to = open(to,O_CREAT|O_WRONLY|O_EXCL);
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if (f_to < 0)
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{
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close(f_from);
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errno = EACCES;
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return -1;
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};
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buf = alloca(32768);
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do
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{
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size = read(f_from, buf, 32768);
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if (size >= 0)
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size = write(f_to, buf, size);
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}while (size == 32768);
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close(f_to);
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close(f_from);
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if (size == -1)
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{
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errno = EACCES;
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return -1;
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};
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remove(from);
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return (0);
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};
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