コード例 #1
0
ファイル: ungetc.c プロジェクト: Ninals-GitHub/TRON
int
__sungetc(int c, FILE *fp)
{
	if (c == EOF)
		return (EOF);
	if (!__sdidinit)
		__sinit();
	/*FLOCKFILE(fp);*/
	_SET_ORIENTATION(fp, -1);
	if ((fp->_flags & __SRD) == 0) {
		/*
		 * Not already reading: no good unless reading-and-writing.
		 * Otherwise, flush any current write stuff.
		 */
		if ((fp->_flags & __SRW) == 0) {
error:			/*FUNLOCKFILE(fp);*/
			return (EOF);
		}
		if (fp->_flags & __SWR) {
			if (__sflush(fp))
				goto error;
			fp->_flags &= ~__SWR;
			fp->_w = 0;
			fp->_lbfsize = 0;
		}
		fp->_flags |= __SRD;
	}
	c = (unsigned char)c;

	/*
	 * If we are in the middle of ungetc'ing, just continue.
	 * This may require expanding the current ungetc buffer.
	 */
	if (HASUB(fp)) {
		if (fp->_r >= _UB(fp)._size && __submore(fp))
			goto error;
		*--fp->_p = c;
inc_ret:	fp->_r++;
		/*FUNLOCKFILE(fp);*/
		return (c);
	}
	fp->_flags &= ~__SEOF;

	/*
	 * If we can handle this by simply backing up, do so,
	 * but never replace the original character.
	 * (This makes sscanf() work when scanning `const' data.)
	 */
	if (fp->_bf._base != NULL && fp->_p > fp->_bf._base &&
	    fp->_p[-1] == c) {
		fp->_p--;
		goto inc_ret;
	}

	/*
	 * Create an ungetc buffer.
	 * Initially, we will use the `reserve' buffer.
	 */
	fp->_ur = fp->_r;
	fp->_up = fp->_p;
	_UB(fp)._base = fp->_ubuf;
	_UB(fp)._size = sizeof(fp->_ubuf);
	fp->_ubuf[sizeof(fp->_ubuf) - 1] = c;
	fp->_p = &fp->_ubuf[sizeof(fp->_ubuf) - 1];
	fp->_r = 1;
	/*FUNLOCKFILE(fp);*/
	return (c);
}
コード例 #2
0
ファイル: ungetc.c プロジェクト: ikonst/crystax
/*
 * Non-MT-safe version
 */
int
__ungetc(int c, FILE *fp)
{

	if (c == EOF)
		return (EOF);
	if ((fp->_flags & __SRD) == 0) {
		/*
		 * Not already reading: no good unless reading-and-writing.
		 * Otherwise, flush any current write stuff.
		 */
		if ((fp->_flags & __SRW) == 0)
			return (EOF);
		if (fp->_flags & __SWR) {
			if (__sflush(fp))
				return (EOF);
			fp->_flags &= ~__SWR;
			fp->_w = 0;
			fp->_lbfsize = 0;
		}
		fp->_flags |= __SRD;
	}
	c = (unsigned char)c;

	/*
	 * If we are in the middle of ungetc'ing, just continue.
	 * This may require expanding the current ungetc buffer.
	 */
#ifndef __ANDROID__
	if (HASUB(fp)) {
		if (fp->_r >= fp->_ub._size && __submore(fp))
			return (EOF);
		*--fp->_p = c;
		fp->_r++;
		return (c);
	}
#endif
	fp->_flags &= ~__SEOF;

	/*
	 * If we can handle this by simply backing up, do so,
	 * but never replace the original character.
	 * (This makes sscanf() work when scanning `const' data.)
	 */
	if (fp->_bf._base != NULL && fp->_p > fp->_bf._base &&
	    fp->_p[-1] == c) {
		fp->_p--;
		fp->_r++;
		return (c);
	}

	/*
	 * Create an ungetc buffer.
	 * Initially, we will use the `reserve' buffer.
	 */
	fp->_ur = fp->_r;
	fp->_up = fp->_p;
#ifndef __ANDROID__
	fp->_ub._base = fp->_ubuf;
	fp->_ub._size = sizeof(fp->_ubuf);
#endif
	fp->_ubuf[sizeof(fp->_ubuf) - 1] = c;
	fp->_p = &fp->_ubuf[sizeof(fp->_ubuf) - 1];
	fp->_r = 1;
	return (c);
}