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86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
/* Copy data between file streams
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*
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* Copyright (c) 2013 Tobias Waldekranz <tobias@waldekranz.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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/**
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* fsendfile - copy data between file streams
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* @src: Source stream
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* @dst: Destination stream
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* @len: Number of bytes to copy
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*
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* @dst may be %NULL, in which case @len bytes are read and discarded
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* from @src. This can be useful for streams where seeking is not
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* permitted. Additionally, @len may be the special value zero (0), in
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* which case fsendfile() will copy until %EOF is seen on @src.
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*
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* Returns:
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* The number of bytes copied. If an error is detected -1 is returned
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* and @errno will be set accordingly.
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*/
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ssize_t fsendfile(FILE *src, FILE *dst, size_t len)
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{
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char *buf;
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size_t tot = 0;
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ssize_t blk = BUFSIZ, num = 0;
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if (!src) {
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errno = EINVAL;
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return -1;
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}
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buf = (char *)malloc(BUFSIZ);
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if (!buf)
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return -1;
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while (!len || tot < len) {
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if (len && ((len - tot) < BUFSIZ))
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blk = len - tot;
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num = fread(buf, 1, blk, src);
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if (num == 0)
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break;
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if (dst && (fwrite(buf, num, 1, dst) != 1)) {
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num = -1;
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break;
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}
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tot += num;
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}
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free(buf);
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return (num == -1) ? -1 : (ssize_t)tot;
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}
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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