nvi/vi/getc.c

46 cs_init(SCR *sp, VCS *csp)
50 	if (db_eget(sp, csp->cs_lno, &csp->cs_bp, &csp->cs_len, &isempty)) {
55 	if (csp->cs_len == 0 || v_isempty(csp->cs_bp, csp->cs_len)) {
56 		csp->cs_cno = 0;
57 		csp->cs_flags = CS_EMP;
59 		csp->cs_flags = 0;
60 		csp->cs_ch = csp->cs_bp[csp->cs_cno];
72 cs_next(SCR *sp, VCS *csp)
76 	switch (csp->cs_flags) {
79 		if (db_get(sp, ++csp->cs_lno, 0, &p, &csp->cs_len)) {
80 			--csp->cs_lno;
81 			csp->cs_flags = CS_EOF;
83 			csp->cs_bp = p;
84 			if (csp->cs_len == 0 ||
85 			    v_isempty(csp->cs_bp, csp->cs_len)) {
86 				csp->cs_cno = 0;
87 				csp->cs_flags = CS_EMP;
89 				csp->cs_flags = 0;
90 				csp->cs_ch = csp->cs_bp[csp->cs_cno = 0];
95 		if (csp->cs_cno == csp->cs_len - 1)
96 			csp->cs_flags = CS_EOL;
98 			csp->cs_ch = csp->cs_bp[++csp->cs_cno];
122 cs_fspace(SCR *sp, VCS *csp)
124 	if (csp->cs_flags != 0 || !ISBLANK(csp->cs_ch))
127 		if (cs_next(sp, csp))
129 		if (csp->cs_flags != 0 || !ISBLANK(csp->cs_ch))
142 cs_fblank(SCR *sp, VCS *csp)
145 		if (cs_next(sp, csp))
147 		if (csp->cs_flags == CS_EOL || csp->cs_flags == CS_EMP ||
148 		    (csp->cs_flags == 0 && ISBLANK(csp->cs_ch)))
162 cs_prev(SCR *sp, VCS *csp)
164 	switch (csp->cs_flags) {
167 		if (csp->cs_lno == 1) {		/* SOF. */
168 			csp->cs_flags = CS_SOF;
172 		    --csp->cs_lno, DBG_FATAL, &csp->cs_bp, &csp->cs_len)) {
173 			++csp->cs_lno;
176 		if (csp->cs_len == 0 || v_isempty(csp->cs_bp, csp->cs_len)) {
177 			csp->cs_cno = 0;
178 			csp->cs_flags = CS_EMP;
180 			csp->cs_flags = 0;
181 			csp->cs_cno = csp->cs_len - 1;
182 			csp->cs_ch = csp->cs_bp[csp->cs_cno];
187 		if (csp->cs_cno == 0)
188 			if (csp->cs_lno == 1)
189 				csp->cs_flags = CS_SOF;
191 				csp->cs_flags = CS_EOL;
193 			csp->cs_ch = csp->cs_bp[--csp->cs_cno];
211 cs_bblank(SCR *sp, VCS *csp)
214 		if (cs_prev(sp, csp))
216 		if (csp->cs_flags == CS_EOL || csp->cs_flags == CS_EMP ||
217 		    (csp->cs_flags == 0 && ISBLANK(csp->cs_ch)))