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/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)getc.c 8.6 (Berkeley) 10/26/93";
#endif /* not lint */
#include <sys/types.h>
#include <ctype.h>
#include "vi.h"
#include "vcmd.h"
/*
* Character stream routines --
* These routines return the file a character at a time. There are two
* special cases. First, the end of a line, end of a file, start of a
* file and empty lines are returned as special cases, and no character
* is returned. Second, empty lines include lines that have only white
* space in them, because the vi search functions don't care about white
* space, and this makes it easier for them to be consistent.
*/
/*
* cs_init --
* Initialize character stream routines.
*/
int
cs_init(sp, ep, csp)
SCR *sp;
EXF *ep;
VCS *csp;
{
recno_t lno;
if ((csp->cs_bp =
file_gline(sp, ep, csp->cs_lno, &csp->cs_len)) == NULL) {
if (file_lline(sp, ep, &lno))
return (1);
if (lno == 0)
msgq(sp, M_BERR, "Empty file.");
else
GETLINE_ERR(sp, csp->cs_lno);
return (1);
}
if (csp->cs_len == 0 || v_isempty(csp->cs_bp, csp->cs_len)) {
csp->cs_cno = 0;
csp->cs_flags = CS_EMP;
} else {
csp->cs_flags = 0;
csp->cs_ch = csp->cs_bp[csp->cs_cno];
}
return (0);
}
/*
* cs_next --
* Retrieve the next character.
*/
int
cs_next(sp, ep, csp)
SCR *sp;
EXF *ep;
VCS *csp;
{
recno_t slno;
switch (csp->cs_flags) {
case CS_EMP: /* EMP; get next line. */
case CS_EOL: /* EOL; get next line. */
slno = csp->cs_lno; /* Save current line. */
if ((csp->cs_bp =
file_gline(sp, ep, ++csp->cs_lno, &csp->cs_len)) == NULL) {
csp->cs_lno = slno;
if (file_lline(sp, ep, &slno))
return (1);
if (slno > csp->cs_lno) {
GETLINE_ERR(sp, csp->cs_lno);
return (1);
}
csp->cs_flags = CS_EOF;
} else if (csp->cs_len == 0 ||
v_isempty(csp->cs_bp, csp->cs_len)) {
csp->cs_cno = 0;
csp->cs_flags = CS_EMP;
} else {
csp->cs_flags = 0;
csp->cs_ch = csp->cs_bp[csp->cs_cno = 0];
}
break;
case 0:
if (csp->cs_cno == csp->cs_len - 1)
csp->cs_flags = CS_EOL;
else
csp->cs_ch = csp->cs_bp[++csp->cs_cno];
break;
case CS_EOF: /* EOF; only returned once. */
default:
abort();
/* NOTREACHED */
}
return (0);
}
/*
* cs_fspace --
* If on a space, eat forward until something other than a
* whitespace character.
*
* XXX
* Semantics of checking the current character were coded for the fword()
* function -- once the other word routines are converted, they may have
* to change.
*/
int
cs_fspace(sp, ep, csp)
SCR *sp;
EXF *ep;
VCS *csp;
{
if (csp->cs_flags != 0 || !isblank(csp->cs_ch))
return (0);
for (;;) {
if (cs_next(sp, ep, csp))
return (1);
if (csp->cs_flags != 0 || !isblank(csp->cs_ch))
break;
}
return (0);
}
/*
* cs_fblank --
* Eat forward to the next non-whitespace character.
*/
int
cs_fblank(sp, ep, csp)
SCR *sp;
EXF *ep;
VCS *csp;
{
for (;;) {
if (cs_next(sp, ep, csp))
return (1);
if (csp->cs_flags == CS_EOL || csp->cs_flags == CS_EMP ||
csp->cs_flags == 0 && isblank(csp->cs_ch))
continue;
break;
}
return (0);
}
/*
* cs_prev --
* Retrieve the previous character.
*/
int
cs_prev(sp, ep, csp)
SCR *sp;
EXF *ep;
VCS *csp;
{
recno_t slno;
switch (csp->cs_flags) {
case CS_EMP: /* EMP; get previous line. */
case CS_EOL: /* EOL; get previous line. */
if (csp->cs_lno == 1) { /* SOF. */
csp->cs_flags = CS_SOF;
break;
}
slno = csp->cs_lno; /* Save current line. */
if ((csp->cs_bp = /* Line should exist. */
file_gline(sp, ep, --csp->cs_lno, &csp->cs_len)) == NULL) {
GETLINE_ERR(sp, csp->cs_lno);
csp->cs_lno = slno;
return (1);
}
if (csp->cs_len == 0 || v_isempty(csp->cs_bp, csp->cs_len)) {
csp->cs_cno = 0;
csp->cs_flags = CS_EMP;
} else {
csp->cs_flags = 0;
csp->cs_cno = csp->cs_len - 1;
csp->cs_ch = csp->cs_bp[csp->cs_cno];
}
break;
case 0:
if (csp->cs_cno == 0)
csp->cs_flags = CS_EOL;
else
csp->cs_ch = csp->cs_bp[--csp->cs_cno];
break;
case CS_SOF: /* SOF; only returned once. */
default:
abort();
/* NOTREACHED */
}
return (0);
}
/*
* cs_bblank --
* Eat backward to the next non-whitespace character.
*/
int
cs_bblank(sp, ep, csp)
SCR *sp;
EXF *ep;
VCS *csp;
{
for (;;) {
if (cs_prev(sp, ep, csp))
return (1);
if (csp->cs_flags == CS_EOL || csp->cs_flags == CS_EMP ||
csp->cs_flags == 0 && isblank(csp->cs_ch))
continue;
break;
}
return (0);
}
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