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-
- FSEEK(3) UNIX Programmer's Manual FSEEK(3)
-
- NNAAMMEE
- ffggeettppooss, ffsseeeekk, ffsseettppooss, fftteellll, rreewwiinndd - reposition a stream
-
- SSYYNNOOPPSSIISS
- ##iinncclluuddee <<ssttddiioo..hh>>
-
- _i_n_t
- ffsseeeekk(_F_I_L_E _*_s_t_r_e_a_m, _l_o_n_g _o_f_f_s_e_t, _i_n_t _w_h_e_n_c_e)
-
- _l_o_n_g
- fftteellll(_F_I_L_E _*_s_t_r_e_a_m)
-
- _v_o_i_d
- rreewwiinndd(_F_I_L_E _*_s_t_r_e_a_m)
-
- _i_n_t
- ffggeettppooss(_F_I_L_E _*_s_t_r_e_a_m, _f_p_o_s___t _*_p_o_s)
-
- _i_n_t
- ffsseettppooss(_F_I_L_E _*_s_t_r_e_a_m, _f_p_o_s___t _*_p_o_s)
-
- DDEESSCCRRIIPPTTIIOONN
- The ffsseeeekk() function sets the file position indicator for the stream
- pointed to by _s_t_r_e_a_m. The new position, measured in bytes, is obtained by
- adding _o_f_f_s_e_t bytes to the position specified by _w_h_e_n_c_e. If _w_h_e_n_c_e is set
- to SEEK_SET, SEEK_CUR, or SEEK_END, the offset is relative to the start
- of the file, the current position indicator, or endoffile, respective
- ly. A successful call to the ffsseeeekk() function clears the endoffile in
- dicator for the stream and undoes any effects of the ungetc(3) function
- on the same stream.
-
- The fftteellll() function obtains the current value of the file position indi
- cator for the stream pointed to by _s_t_r_e_a_m.
-
- The rreewwiinndd() function sets the file position indicator for the stream
- pointed to by _s_t_r_e_a_m to the beginning of the file. It is equivalent to:
-
- (void)fseek(stream, 0L, SEEK_SET)
-
- except that the error indicator for the stream is also cleared (see
- clearerr(3)).
-
- The ffggeettppooss() and ffsseettppooss() functions are alternate interfaces equivalent
- to fftteellll() and ffsseeeekk() (with whence set to SEEK_SET ), setting and stor
- ing the current value of the file offset into or from the object refer
- enced by _p_o_s. On some (nonUNIX) systems an ``_f_p_o_s___t'' object may be a
- complex object and these routines may be the only way to portably reposi
- tion a text stream.
-
- RREETTUURRNN VVAALLUUEESS
- The rreewwiinndd() function returns no value. Upon successful completion,
- ffggeettppooss(), ffsseeeekk(), ffsseettppooss() return 0, and fftteellll() returns the current
- offset. Otherwise, -1 is returned and the global variable errno is set
- to indicate the error.
-
- EERRRROORRSS
- [EBADF] The _s_t_r_e_a_m specified is not a seekable stream.
-
- [EINVAL] The _w_h_e_n_c_e argument to ffsseeeekk() was not SEEK_SET, SEEK_END, or
- SEEK_CUR.
-
-
- The function ffggeettppooss(), ffsseeeekk(), ffsseettppooss(), and fftteellll() may also fail and
- set _e_r_r_n_o for any of the errors specified for the routines fflush(3),
- fstat(2), lseek(2), and malloc(3).
-
- SSEEEE AALLSSOO
- lseek(2)
-
- SSTTAANNDDAARRDDSS
- The ffggeettppooss(), ffsseettppooss(), ffsseeeekk(), fftteellll(), and rreewwiinndd() functions con
- form to ANSI C3.1591989 (``ANSI C'').
-
- BSD Experimental June 29, 1991 2
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