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unvis, strunvis — ?????饯???β???ɽ???Υǥ?????

?饤?֥???

Standard C Library (libc, -lc)

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<vis.h> int unvis(char *cp, int c, int *astate, int flag) int strunvis(char *dst, const char *src)

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unvis() ?????? strunvis() ?ؿ??ϡ??㤨?? vis(3) ?ؿ??ˤ??äƺ??? ?Ф??줿?褦?ʥ????饯???β???ɽ?????ǥ????ɤ??Ƹ??η????ᤷ?ޤ??? unvis?? c ?ˤ???Ϣ³???륭???饯???ȤȤ???ͭ???ʥ??????󥹤?ǧ?????????ޤǸƤ? ?Ф??졢???줬ǧ?????????ȥǥ????ɤ??줿?????饯???? cp ?ˤ??äƻؤ????륭???饯???ΤȤ??????֤????ޤ??? strunvis?ϡ? src ?ˤ????ؤ????륭???饯???? dst ?ˤ????ؤ??????Хåե??إǥ????ɤ??ޤ???

strunvis() ?ؿ??ϡ??????????ץ??????󥹤??ǥ????ɤ??ʤ???ñ?? src ?? dst ?إ??ԡ????? dst ???֤??줿?????饯???ο????֤??????ޤ???̵???? ?????????ץ??????󥹤????Ф??줿?????ˤ? -1 ???֤??ޤ??? dst ?Υ??????ϡ? src ?Υ??????????????ʤ????Фʤ??ޤ??? (???ʤ??????ǥ????????ˤϳ?ĥ?? ???????ޤ???)??

unvis() ?ؿ??ϡ?Ǥ?դΥХ??ȥ??ȥ꡼?????ǥ????ɤǤ??륹?ơ??ȥޥ????? ?????ץ??????Ȥ??Ƥ??ޤ????ǥ????ɤ????뤽?ΥХ??Ȥ??տ魯?뤹?٤Ƥ? ???ơ??Ȥϡ? unvis() ?ؿ??γ?????¸?????ޤ????? (???ʤ????????ơ??Ȥؤ? ?ݥ??󥿤??Ϥ????ޤ?????)???ۤʤ륹?ȥ꡼?????ǥ????ɤ????ƤӽФ?????ͳ?? ???ߤ??뤳?Ȥ??Ǥ??ޤ????Х??ȥ??ȥ꡼???Υǥ????ɤ򳫻Ϥ????ˤϡ??ޤ? ?????򥼥??˽????????ޤ????????????ؤΥݥ??󥿤????ӥǥ??????襭???饯?? ?ؤΥݥ??󥿤ȤȤ???Ϣ³?????Х??ȤΤ??줾???? unvis() ???ƤӽФ??ޤ??? unvis() ?ؿ??ϡ?Ŭ?ڤ˼谷???ͤФʤ??ʤ??????Ĥ??Υ꥿???󥳡??ɤ? ???äƤ??ޤ??????????ϼ????̤??Ǥ?:

0 (????)

?????饯?????⤦????ɬ?פǤ??ꡢ?ޤ?????ǧ???????Ƥ??ޤ?????

UNVIS_VALID

ͭ???ʥ????饯????ǧ?????졢cp ?ˤ??äƻؤ????????????֤????Ƥ??ޤ???

UNVIS_VALIDPUSH

ͭ???ʥ????饯????ǧ?????졢cp ?ˤ??äƻؤ??????????? ?֤????Ƥ??ޤ????????????????Ϥ????Ƥ??뤽?Υ????饯?????⤦?????Ϥ? ɬ?פ??????ޤ???

UNVIS_NOCHAR

ͭ???ʥ??????󥹤????Ф??줿?????????饯???? ?????????Ƥ??ޤ??󡣤??Υ꥿???󥳡??ɤϡ??????饯???δ֤?????Ū???ڤ??? ??????????ɬ?פǤ???

UNVIS_SYNBAD

̵???ʥ????????ץ??????󥹤????Ф??줿?????ޤ??? ?ǥ????????????Υ??ơ??Ȥˤ????ޤ????ǥ??????ϥ??????Ȼ??Υ??ơ??Ȥ? ?֤????ޤ???

???ȥ꡼???Τ??٤ƤΥХ??Ȥ????????줿?Ȥ??? flag ?? UNVIS_END ?????ꤷ?Ƥ⤦???? unvis() ???ƤӽФ??ƻĤäƤ??륭???饯???? ???Ф??ޤ? (?Ϥ??줿?????饯????̵?뤵???ޤ?)??

???Τ褦????ʬŪ?????ɤϡ? unvis() ??Ŭ?ڤʻ???ˡ?򼨤??Ƥ??ޤ???

int state = 0;
char out;

while ((ch = getchar()) != EOF) {
again:
	switch(unvis(&out, ch, &state, 0)) {
	case 0:
	case UNVIS_NOCHAR:
		break;
	case UNVIS_VALID:
		(void) putchar(out);
		break;
	case UNVIS_VALIDPUSH:
		(void) putchar(out);
		goto again;
	case UNVIS_SYNBAD:
		(void)fprintf(stderr, "bad sequence!\n");
	exit(1);
	}
}
if (unvis(&out, (char)0, &state, UNVIS_END) == UNVIS_VALID)
	(void) putchar(out);

??Ϣ????

vis(1)

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unvis() ?ؿ??ϡ? 4.4BSD ?ǤϤ??????о줷?ޤ?????