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fgetpos, fseek, fseeko, fsetpos, ftell, ftello, rewind — ???ȥ꡼???ΰ????ѹ?

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Standard C Library (libc, -lc)

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<stdio.h> int fseek(FILE *stream, long offset, int whence) long ftell(FILE *stream) void rewind(FILE *stream) int fgetpos(FILE *stream, fpos_t *pos) int fsetpos(FILE *stream, const fpos_t *pos) <sys/types.h> int fseeko(FILE *stream, off_t offset, int whence) off_t ftello(FILE *stream)

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fseek() ?ؿ??ϡ? stream ???ؤ????ȥ꡼???Υե????????֥??󥸥??????? ???ꤷ?ޤ????????????֤ϥХ???ñ?̤Ƿ?¬???졢 whence ?ǻ??ꤵ?줿???֤? offset ?Х??Ȥ?­?????Ȥ????????ޤ??? whence ?? SEEK_SET, SEEK_CUR, SEEK_END ?????ꤵ???Ƥ??????硢???ե??åȤϡ????줾?졢?ե??????κǽ顢 ???󥸥??????θ??߰??֡??ե??????κǸ夫???????а??֤ˤʤ??ޤ??? fseek() ?ؿ??θƤӽФ??? ???꤬ȯ?????ʤ??????ϡ????ȥ꡼???? end-of-file ?ؼ??Ҥ????ꥢ???졢 ???Υ??ȥ꡼?????Ф??? ungetc(3) ?ؿ??θ??̤ϼ????ä????ޤ???

ftell() ?ؿ??ϡ? stream ???ؤ????ȥ꡼???Υե????????֥??󥸥??????? ???ߤ??ͤ????ꤷ?ޤ???

rewind() ?ؿ??ϡ? stream ???ؤ????ȥ꡼???Υե????????֥??󥸥??????? ?ե??????κǽ??????ꤷ?ޤ????????ϡ? ???ȥ꡼???Υ??顼???󥸥??????????ꥢ?????뤳?? ( clearerr(3) ?򻲾?) ???????С??ʲ???Ʊ?????̤ˤʤ??ޤ???

fseeko() ?ؿ??? fseek() ??Ʊ?ͤǤ????? ?????ˤ? long ?????????? off_t ???Ȥ??ޤ??? Ʊ?ͤ? ftello() ?ؿ??? ftell() ??Ʊ???Ǥ????? off_t ???֤??ޤ???

fgetpos() ?ؿ??? fsetpos() ?ؿ??ϡ?( whence ?? SEEK_SET ?????ꤷ?? ) ftell() ?? fseek() ??Ʊ?????󥿥ե??????ǡ??ե????륪?ե??åȤθ??ߤ??ͤ? pos ?????Ȥ??륪?֥??????Ȥ??????ꤷ???ꡢ pos ?????Ȥ??륪?֥??????Ȥ???¸?????ꤷ?ޤ??? ?????? (UNIX ?ʳ???) ?????ƥ??Ǥϡ? “fpos_t” ???֥??????Ȥ?ʣ?祪?֥??????ȤǤ??뤫?⤷???ʤ??Τǡ? ?ܿ??????ݤ??ʤ????ƥ????ȥ??ȥ꡼???ΰ??֤? ?ѹ????뤿???ˤϡ????Υ롼?????˰ͤ뤷???ʤ????Ȥ⤢???ޤ???

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rewind() ?ؿ????ͤ??֤??ޤ?????

The fgetpos(), fseek(), fseeko(), and fsetpos() functions return the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

???????ƽ?λ?????ȡ? ftell() ?????? ftello() ?ϸ??ߤΥ??ե??åȤ??֤??ޤ????????ʳ??ξ????? -1 ???֤??졢 ???????Х??ѿ? errno ?????ꤵ???ƥ??顼?򼨤??ޤ???

???顼

[EBADF]

???ꤵ?줿 stream ???????????Ǥ??륹?ȥ꡼???ǤϤ????ޤ?????

[EINVAL]

fseek() ?? whence ???????? SEEK_SET, SEEK_END, SEEK_CUR ?Τɤ??Ǥ⤢???ޤ?????

[EOVERFLOW]

ftell() ???¹Ԥ??????̤Υե??????Υ??ե??åȤ? long ???Υ??֥??????ȤǤ???????ɽ???Ǥ??ʤ??ͤȤʤ??ޤ?????

fgetpos(), fseek(), fseeko(), fsetpos(), ftell(), ftello() ?ؿ??????Ԥ??????ˤϡ? ?롼???? fflush(3), fstat(2), lseek(2), malloc(3) ?ˤĤ??Ƽ????Ƥ??륨?顼?? errno ?????ꤵ???Ƥ??뤳?Ȥ⤢???ޤ???

??Ϣ????

lseek(2)

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fgetpos(), fsetpos(), fseek(), ftell(), rewind() ?ؿ??ϡ? ISO/IEC 9899:1990 (“ISO C90”) ??Ŭ?礷?Ƥ??ޤ???

fseeko() ?? ftello() ?ؿ??ϡ? Version 2 of the Single UNIX Specification (“SUSv2”) ??Ŭ?礷?Ƥ??ޤ???