X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=visor;a=blobdiff_plain;f=libvisor%2Fsrc%2Fvisor.c;h=86d508b202909556500b6738b0e539b67f78599f;hp=af79b4a5b6ad7ba470ebb62614bdd84730fd4643;hb=1c7c43c39b2b6f9224bcd39e3a24b8e91ada2cae;hpb=4f957b16f77eb7761afd9e0b9064c7f08deb45be

diff --git a/libvisor/src/visor.c b/libvisor/src/visor.c
index af79b4a..86d508b 100644
--- a/libvisor/src/visor.c
+++ b/libvisor/src/visor.c
@@ -1,9 +1,52 @@
+/*
+visor - lightweight system-independent embeddable text editor framework
+Copyright (C)  2019 John Tsiombikas <nuclear@member.fsf.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #include "vilibc.h"
 #include "visor.h"
 #include "vimpl.h"
 
-#define vi_malloc(s)	vi->mm.malloc(s)
-#define vi_free(p)		vi->mm.free(p)
+#define vi_malloc	vi->mm.malloc
+#define vi_free		vi->mm.free
+#define vi_realloc	vi->mm.realloc
+
+#define vi_open		vi->fop.open
+#define vi_size		vi->fop.size
+#define vi_close	vi->fop.close
+#define vi_map		vi->fop.map
+#define vi_unmap	vi->fop.unmap
+#define vi_read		vi->fop.read
+#define vi_write	vi->fop.write
+#define vi_seek		vi->fop.seek
+
+#define vi_clear()			vi->tty.clear(vi->tty_cls)
+#define vi_clear_line()		vi->tty.clear_line(vi->tty_cls)
+#define vi_clear_line_at(y)	vi->tty.clear_line_at(y, vi->tty_cls)
+#define vi_setcursor(x, y)	vi->tty.setcursor(x, y, vi->tty_cls)
+#define vi_putchar(c)		vi->tty.putchar(c, vi->tty_cls)
+#define vi_putchar_at(x, y, c)	v->tty.putchar_at(x, y, c, vi->tty_cls)
+#define vi_scroll(n)		vi->tty.scroll(n, vi->tty_cls)
+#define vi_del_back()		vi->tty.del_back(vi->tty_cls)
+#define vi_del_fwd()		vi->tty.del_fwd(vi->tty_cls)
+#define vi_status(s)		vi->tty.status(s, vi->tty_cls)
+#define vi_flush()			vi->tty.flush(vi->tty_cls)
+
+static int remove_buf(struct visor *vi, struct vi_buffer *vb);
+static int add_span(struct vi_buffer *vb, vi_addr at, int src, vi_addr start, unsigned long size);
 
 #ifdef HAVE_LIBC
 static const struct vi_alloc stdalloc = { malloc, free, realloc };
@@ -25,6 +68,9 @@ struct visor *vi_create(struct vi_alloc *mm)
 	memset(vi, 0, sizeof *vi);
 	vi->mm = *mm;
 
+	vi->term_width = 80;
+	vi->term_height = 24;
+
 	return vi;
 }
 
@@ -41,6 +87,72 @@ void vi_set_fileops(struct visor *vi, struct vi_fileops *fop)
 	vi->fop = *fop;
 }
 
+void vi_set_ttyops(struct visor *vi, struct vi_ttyops *tty)
+{
+	vi->tty = *tty;
+}
+
+void vi_term_size(struct visor *vi, int xsz, int ysz)
+{
+	vi->term_width = xsz;
+	vi->term_height = ysz;
+}
+
+void vi_redraw(struct visor *vi)
+{
+	int i, col, cur_x = 0, cur_y = 0;
+	char c;
+	struct vi_buffer *vb;
+	struct vi_span *sp, *spans_end;
+	const char *tptr, *tend;
+	vi_addr spoffs, addr;
+
+	vb = vi->buflist;
+	if(!(sp = vi_buf_find_span(vb, vb->view_start, &spoffs))) {
+		sp = vb->spans;
+		spoffs = 0;
+	}
+	spans_end = vb->spans + vb->num_spans;
+
+	tptr = vi_buf_span_text(vb, sp);
+	tend = tptr + sp->size;
+	tptr += spoffs;
+
+	vi_clear();
+
+	addr = vb->view_start;
+	for(i=0; i<vi->term_height; i++) {
+		vi_setcursor(0, i);
+		col = -vb->view_xscroll - 1;
+		while(++col < vi->term_width && (c = (addr++, *tptr++)) != '\n') {
+			if(addr == vb->cursor) {
+				cur_x = col;
+				cur_y = i;
+			}
+
+			if(col >= 0) {
+				vi_putchar(c);
+			}
+			if(tptr >= tend) {
+				if(++sp >= spans_end) {
+					goto end;
+				}
+				tptr = vi_buf_span_text(vb, sp);
+				tend = tptr + sp->size;
+			}
+		}
+	}
+end:
+
+	while(i < vi->term_height) {
+		vi_setcursor(0, i++);
+		vi_putchar('~');
+	}
+
+	vi_setcursor(cur_x, cur_y);
+	vi_flush();
+}
+
 struct vi_buffer *vi_new_buf(struct visor *vi, const char *path)
 {
 	struct vi_buffer *nb;
@@ -50,6 +162,7 @@ struct vi_buffer *vi_new_buf(struct visor *vi, const char *path)
 		return 0;
 	}
 	memset(nb, 0, sizeof *nb);
+	nb->vi = vi;
 
 	if(path) {
 		if(vi_buf_read(nb, path) == -1) {
@@ -70,3 +183,293 @@ struct vi_buffer *vi_new_buf(struct visor *vi, const char *path)
 	}
 	return nb;
 }
+
+static int remove_buf(struct visor *vi, struct vi_buffer *vb)
+{
+	if(!vi->buflist) {
+		vi_error(vi, "failed to remove a buffer which doesn't exist\n");
+		return -1;
+	}
+
+	if(vb->next == vb) {
+		if(vi->buflist != vb) {
+			vi_error(vi, "failed to remove buffer, buffer list inconsistency\n");
+			return -1;
+		}
+		vi->buflist = 0;
+		return 0;
+	}
+
+	if(vi->buflist == vb) {
+		vi->buflist = vb->next;
+	}
+	vb->prev->next = vb->next;
+	vb->next->prev = vb->prev;
+	vb->next = vb->prev = vb;
+	return 0;
+}
+
+int vi_delete_buf(struct visor *vi, struct vi_buffer *vb)
+{
+	if(remove_buf(vi, vb) == -1) {
+		return -1;
+	}
+
+	vi_free(vb->path);
+	vi_free(vb->orig);
+	vi_free(vb->add);
+	vi_free(vb->spans);
+	return 0;
+}
+
+int vi_num_buf(struct visor *vi)
+{
+	int count;
+	struct vi_buffer *vb;
+
+	if(!vi->buflist) return 0;
+
+	count = 1;
+	vb = vi->buflist->next;
+	while(vb != vi->buflist) {
+		count++;
+		vb = vb->next;
+	}
+	return count;
+}
+
+struct vi_buffer *vi_getcur_buf(struct visor *vi)
+{
+	return vi->buflist;
+}
+
+void vi_setcur_buf(struct visor *vi, struct vi_buffer *vb)
+{
+	vi->buflist = vb;
+}
+
+struct vi_buffer *vi_next_buf(struct visor *vi)
+{
+	return vi->buflist ? vi->buflist->next : 0;
+}
+
+struct vi_buffer *vi_prev_buf(struct visor *vi)
+{
+	return vi->buflist ? vi->buflist->prev : 0;
+}
+
+/* split_span splits the span sp. if size > 0 it moves the second part to sp+2,
+ * leaving an empty place at sp+1 for the new span. The start point of the
+ * second part is adjusted by size.
+ *
+ * It can't fail, because it's always called with the span array having at
+ * least two empty slots (see: add_span).
+ */
+void split_span(struct vi_buffer *vb, struct vi_span *sp, vi_addr spoffs, unsigned long size)
+{
+	int newseg = size > 0 ? 1 : 0;
+	struct vi_span *tail = sp + newseg + 1;
+	int num_move = vb->spans + vb->num_spans - sp - 1;
+
+	memmove(tail + 1, sp + 1, num_move * sizeof *sp);
+	vb->num_spans += tail - sp;
+
+	*tail = *sp;
+	sp->size = spoffs;
+	tail->start += spoffs;
+	tail->size -= spoffs;
+
+	sp = tail;
+	for(;;) {
+		if(size <= tail->size) {
+			tail->size -= size;
+			break;
+		}
+		size -= tail->size;
+		tail->size = 0;
+		tail++;
+	}
+
+	if(tail > sp) {
+		/* we produced one or more zero-sized spans, drop them */
+		num_move = vb->num_spans - (tail - sp);
+		memmove(sp, tail, num_move * sizeof *sp);
+		vb->num_spans -= num_move;
+	}
+}
+
+static int add_span(struct vi_buffer *vb, vi_addr at, int src, vi_addr start, unsigned long size)
+{
+	struct visor *vi = vb->vi;
+	struct vi_span *sp;
+	vi_addr spoffs;
+
+	/* make sure we have space for at least two new spans (split + add) */
+	if(vb->num_spans + 1 >= vb->max_spans) {
+		int newmax = vb->max_spans > 0 ? (vb->max_spans << 1) : 16;
+		struct vi_span *tmp = vi_realloc(vb->spans, newmax * sizeof *tmp);
+		if(!tmp) return -1;
+		vb->spans = tmp;
+		vb->max_spans = newmax;
+	}
+
+	if((sp = vi_buf_find_span(vb, at, &spoffs))) {
+		if(spoffs > 0) {
+			split_span(vb, sp++, spoffs, 1);
+		} else {
+			split_span(vb, sp++, 0, 0);
+		}
+	} else {
+		sp = vb->spans + vb->num_spans;
+	}
+
+	sp->src = src;
+	sp->start = start;
+	sp->size = size;
+	vb->num_spans++;
+	return 0;
+}
+
+void vi_buf_reset(struct vi_buffer *vb)
+{
+	struct visor *vi = vb->vi;
+	struct vi_buffer *prev, *next;
+
+	vi_free(vb->path);
+
+	if(vb->fp) {
+		if(vb->file_mapped) vi_unmap(vb->fp);
+		vi_close(vb->fp);
+	}
+	vi_free(vb->orig);
+	vi_free(vb->add);
+	vi_free(vb->spans);
+
+	prev = vb->prev;
+	next = vb->next;
+	memset(vb, 0, sizeof *vb);
+	vb->prev = prev;
+	vb->next = next;
+	vb->vi = vi;
+}
+
+int vi_buf_read(struct vi_buffer *vb, const char *path)
+{
+	struct visor *vi = vb->vi;
+	vi_file *fp;
+	unsigned long fsz;
+	int plen;
+
+	vi_buf_reset(vb);
+
+	if(!(fp = vi_open(path, VI_RDONLY | VI_CREAT))) {
+		return -1;
+	}
+	plen = strlen(path);
+	if(!(vb->path = vi_malloc(plen + 1))) {
+		vi_error(vi, "failed to allocate path name buffer\n");
+		vi_buf_reset(vb);
+		return -1;
+	}
+	memcpy(vb->path, path, plen + 1);
+
+	vb->num_spans = 0;
+
+	if((fsz = vi_size(fp))) {
+		/* existing file, map it into memory, or failing that read it */
+		if(!vi->fop.map || !(vb->orig = vi_map(fp))) {
+			if(!(vb->orig = vi_malloc(fsz))) {
+				vi_buf_reset(vb);
+				return -1;
+			}
+		} else {
+			vb->file_mapped = 1;
+		}
+
+		if(add_span(vb, 0, SPAN_ORIG, 0, fsz) == -1) {
+			vi_error(vi, "failed to allocate span\n");
+			vi_buf_reset(vb);
+			return -1;
+		}
+	}
+	vb->orig_size = fsz;
+	return 0;
+}
+
+int vi_buf_write(struct vi_buffer *vb, const char *path)
+{
+	int i, wbuf_count;
+	struct visor *vi = vb->vi;
+	vi_file *fp;
+	static char wbuf[512];
+
+	if(!path) path = vb->path;
+	if(!path) {
+		vi_error(vi, "failed to write buffer, unknown path\n");
+		return -1;
+	}
+
+	if(!(fp = vi_open(path, VI_WRONLY | VI_CREAT))) {
+		vi_error(vi, "failed to open %s for writing\n", path);
+		return -1;
+	}
+
+	wbuf_count = 0;
+	for(i=0; i<vb->num_spans; i++) {
+		struct vi_span *sp = vb->spans + i;
+		const char *sptxt = vi_buf_span_text(vb, sp);
+		int n, count = 0;
+		while(count < sp->size) {
+			n = sp->size - count;
+			if(n > sizeof wbuf - wbuf_count) {
+				n = sizeof wbuf - wbuf_count;
+			}
+			memcpy(wbuf + wbuf_count, sptxt + count, n);
+			count += n;
+			wbuf_count += n;
+		}
+
+		if(wbuf_count >= sizeof wbuf) {
+			vi_write(fp, wbuf, wbuf_count);
+		}
+	}
+
+	if(wbuf_count > 0) {
+		vi_write(fp, wbuf, wbuf_count);
+	}
+	vi_close(fp);
+	return 0;
+}
+
+long vi_buf_size(struct vi_buffer *vb)
+{
+	int i;
+	long sz = 0;
+
+	for(i=0; i<vb->num_spans; i++) {
+		sz += vb->spans[i].size;
+	}
+	return sz;
+}
+
+struct vi_span *vi_buf_find_span(struct vi_buffer *vb, vi_addr at, vi_addr *soffs)
+{
+	int i;
+	long sz = 0, prev_sz;
+
+	for(i=0; i<vb->num_spans; i++) {
+		prev_sz = sz;
+		sz += vb->spans[i].size;
+		if(sz > at) {
+			if(soffs) *soffs = at - prev_sz;
+			return vb->spans + i;
+		}
+	}
+	return 0;
+}
+
+const char *vi_buf_span_text(struct vi_buffer *vb, struct vi_span *sp)
+{
+	const char *buf = sp->src == SPAN_ORIG ? vb->orig : vb->add;
+	return buf + sp->start;
+}