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  • C Standard Library: File Positioning Functions

    1.6 File Positioning Functions
    int fseek(FILE *stream, long offset, int origin)
    fseek sets the file position for stream; a subsequent read or write will access data
    beginning at the new position. For a binary file, the position is set to offset characters
    from origin, which may be SEEK_SET (beginning), SEEK_CUR (current position), or
    SEEK_END (end of file). For a text stream, offset must be zero, or a value returned by
    ftell (in which case origin must be SEEK_SET). fseek returns non-zero on error.


    long ftell(FILE *stream)
    ftell returns the current file position for stream, or -1 on error.


    void rewind(FILE *stream)
    rewind(fp) is equivalent to fseek(fp, 0L, SEEK_SET); clearerr(fp).


    int fgetpos(FILE *stream, fpos_t *ptr)
    fgetpos records the current position in stream in *ptr, for subsequent use by
    fsetpos. The type fpos_t is suitable for recording such values. fgetpos returns nonzero
    on error.


    int fsetpos(FILE *stream, const fpos_t *ptr)

    fsetpos positions stream at the position recorded by fgetpos in *ptr. fsetpos
    returns non-zero on error.

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  • 原文地址:https://www.cnblogs.com/freewater/p/2972250.html
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