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46 lines
911 B
46 lines
911 B
#include "stdio_impl.h"
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int __fseeko_unlocked(FILE *f, off_t off, int whence)
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{
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/* Adjust relative offset for unread data in buffer, if any. */
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if (whence == SEEK_CUR) off -= f->rend - f->rpos;
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/* Flush write buffer, and report error on failure. */
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if (f->wpos > f->wbase) {
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f->write(f, 0, 0);
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if (!f->wpos) return -1;
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}
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/* Leave writing mode */
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f->wpos = f->wbase = f->wend = 0;
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/* Perform the underlying seek. */
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if (f->seek(f, off, whence) < 0) {
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f->flags |= F_ERR;
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return -1;
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}
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/* If seek succeeded, file is seekable and we discard read buffer. */
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f->rpos = f->rend = 0;
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f->flags &= ~F_EOF;
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return 0;
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}
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int __fseeko(FILE *f, off_t off, int whence)
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{
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int result;
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FLOCK(f);
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result = __fseeko_unlocked(f, off, whence);
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FUNLOCK(f);
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return result;
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}
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int fseek(FILE *f, long off, int whence)
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{
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return __fseeko(f, off, whence);
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}
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weak_alias(__fseeko, fseeko);
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LFS64(fseeko);
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