Snapshot of libvterm library.
Change-Id: Ic9b0f76021b7800d53052192cb9bbe5d77d82043
diff --git a/src/vterm.c b/src/vterm.c
new file mode 100644
index 0000000..b8d7bd1
--- /dev/null
+++ b/src/vterm.c
@@ -0,0 +1,327 @@
+#include "vterm_internal.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+
+/*****************
+ * API functions *
+ *****************/
+
+static void *default_malloc(size_t size, void *allocdata)
+{
+ void *ptr = malloc(size);
+ if(ptr)
+ memset(ptr, 0, size);
+ return ptr;
+}
+
+static void default_free(void *ptr, void *allocdata)
+{
+ free(ptr);
+}
+
+static VTermAllocatorFunctions default_allocator = {
+ .malloc = &default_malloc,
+ .free = &default_free,
+};
+
+VTerm *vterm_new(int rows, int cols)
+{
+ return vterm_new_with_allocator(rows, cols, &default_allocator, NULL);
+}
+
+VTerm *vterm_new_with_allocator(int rows, int cols, VTermAllocatorFunctions *funcs, void *allocdata)
+{
+ /* Need to bootstrap using the allocator function directly */
+ VTerm *vt = (*funcs->malloc)(sizeof(VTerm), allocdata);
+
+ vt->allocator = funcs;
+ vt->allocdata = allocdata;
+
+ vt->rows = rows;
+ vt->cols = cols;
+
+ vt->parser_state = NORMAL;
+
+ vt->strbuffer_len = 64;
+ vt->strbuffer_cur = 0;
+ vt->strbuffer = vterm_allocator_malloc(vt, vt->strbuffer_len);
+
+ vt->outbuffer_len = 64;
+ vt->outbuffer_cur = 0;
+ vt->outbuffer = vterm_allocator_malloc(vt, vt->outbuffer_len);
+
+ return vt;
+}
+
+void vterm_free(VTerm *vt)
+{
+ if(vt->screen)
+ vterm_screen_free(vt->screen);
+
+ if(vt->state)
+ vterm_state_free(vt->state);
+
+ vterm_allocator_free(vt, vt->strbuffer);
+ vterm_allocator_free(vt, vt->outbuffer);
+
+ vterm_allocator_free(vt, vt);
+}
+
+void *vterm_allocator_malloc(VTerm *vt, size_t size)
+{
+ return (*vt->allocator->malloc)(size, vt->allocdata);
+}
+
+void vterm_allocator_free(VTerm *vt, void *ptr)
+{
+ (*vt->allocator->free)(ptr, vt->allocdata);
+}
+
+void vterm_get_size(const VTerm *vt, int *rowsp, int *colsp)
+{
+ if(rowsp)
+ *rowsp = vt->rows;
+ if(colsp)
+ *colsp = vt->cols;
+}
+
+void vterm_set_size(VTerm *vt, int rows, int cols)
+{
+ vt->rows = rows;
+ vt->cols = cols;
+
+ if(vt->parser_callbacks && vt->parser_callbacks->resize)
+ (*vt->parser_callbacks->resize)(rows, cols, vt->cbdata);
+}
+
+void vterm_set_parser_callbacks(VTerm *vt, const VTermParserCallbacks *callbacks, void *user)
+{
+ vt->parser_callbacks = callbacks;
+ vt->cbdata = user;
+}
+
+void vterm_parser_set_utf8(VTerm *vt, int is_utf8)
+{
+ vt->mode.utf8 = is_utf8;
+}
+
+void vterm_push_output_bytes(VTerm *vt, const char *bytes, size_t len)
+{
+ if(len > vt->outbuffer_len - vt->outbuffer_cur) {
+ fprintf(stderr, "vterm_push_output(): buffer overflow; truncating output\n");
+ len = vt->outbuffer_len - vt->outbuffer_cur;
+ }
+
+ memcpy(vt->outbuffer + vt->outbuffer_cur, bytes, len);
+ vt->outbuffer_cur += len;
+}
+
+void vterm_push_output_vsprintf(VTerm *vt, const char *format, va_list args)
+{
+ int written = vsnprintf(vt->outbuffer + vt->outbuffer_cur,
+ vt->outbuffer_len - vt->outbuffer_cur,
+ format, args);
+ vt->outbuffer_cur += written;
+}
+
+void vterm_push_output_sprintf(VTerm *vt, const char *format, ...)
+{
+ va_list args;
+ va_start(args, format);
+ vterm_push_output_vsprintf(vt, format, args);
+ va_end(args);
+}
+
+void vterm_push_output_sprintf_ctrl(VTerm *vt, unsigned char ctrl, const char *fmt, ...)
+{
+ if(ctrl >= 0x80 && !vt->mode.ctrl8bit)
+ vterm_push_output_sprintf(vt, "\e%c", ctrl - 0x40);
+ else
+ vterm_push_output_sprintf(vt, "%c", ctrl);
+
+ va_list args;
+ va_start(args, fmt);
+ vterm_push_output_vsprintf(vt, fmt, args);
+ va_end(args);
+
+ if(ctrl == C1_DCS)
+ vterm_push_output_sprintf_ctrl(vt, C1_ST, "");
+}
+
+size_t vterm_output_bufferlen(VTerm *vt)
+{
+ return vterm_output_get_buffer_current(vt);
+}
+
+size_t vterm_output_get_buffer_size(const VTerm *vt)
+{
+ return vt->outbuffer_len;
+}
+
+size_t vterm_output_get_buffer_current(const VTerm *vt)
+{
+ return vt->outbuffer_cur;
+}
+
+size_t vterm_output_get_buffer_remaining(const VTerm *vt)
+{
+ return vt->outbuffer_len - vt->outbuffer_cur;
+}
+
+size_t vterm_output_bufferread(VTerm *vt, char *buffer, size_t len)
+{
+ if(len > vt->outbuffer_cur)
+ len = vt->outbuffer_cur;
+
+ memcpy(buffer, vt->outbuffer, len);
+
+ if(len < vt->outbuffer_cur)
+ memmove(vt->outbuffer, vt->outbuffer + len, vt->outbuffer_cur - len);
+
+ vt->outbuffer_cur -= len;
+
+ return len;
+}
+
+VTermValueType vterm_get_attr_type(VTermAttr attr)
+{
+ switch(attr) {
+ case VTERM_ATTR_BOLD: return VTERM_VALUETYPE_BOOL;
+ case VTERM_ATTR_UNDERLINE: return VTERM_VALUETYPE_INT;
+ case VTERM_ATTR_ITALIC: return VTERM_VALUETYPE_BOOL;
+ case VTERM_ATTR_BLINK: return VTERM_VALUETYPE_BOOL;
+ case VTERM_ATTR_REVERSE: return VTERM_VALUETYPE_BOOL;
+ case VTERM_ATTR_STRIKE: return VTERM_VALUETYPE_BOOL;
+ case VTERM_ATTR_FONT: return VTERM_VALUETYPE_INT;
+ case VTERM_ATTR_FOREGROUND: return VTERM_VALUETYPE_COLOR;
+ case VTERM_ATTR_BACKGROUND: return VTERM_VALUETYPE_COLOR;
+ }
+ return 0; /* UNREACHABLE */
+}
+
+VTermValueType vterm_get_prop_type(VTermProp prop)
+{
+ switch(prop) {
+ case VTERM_PROP_CURSORVISIBLE: return VTERM_VALUETYPE_BOOL;
+ case VTERM_PROP_CURSORBLINK: return VTERM_VALUETYPE_BOOL;
+ case VTERM_PROP_ALTSCREEN: return VTERM_VALUETYPE_BOOL;
+ case VTERM_PROP_TITLE: return VTERM_VALUETYPE_STRING;
+ case VTERM_PROP_ICONNAME: return VTERM_VALUETYPE_STRING;
+ case VTERM_PROP_REVERSE: return VTERM_VALUETYPE_BOOL;
+ case VTERM_PROP_CURSORSHAPE: return VTERM_VALUETYPE_INT;
+ }
+ return 0; /* UNREACHABLE */
+}
+
+void vterm_scroll_rect(VTermRect rect,
+ int downward,
+ int rightward,
+ int (*moverect)(VTermRect src, VTermRect dest, void *user),
+ int (*eraserect)(VTermRect rect, int selective, void *user),
+ void *user)
+{
+ VTermRect src;
+ VTermRect dest;
+
+ if(abs(downward) >= rect.end_row - rect.start_row ||
+ abs(rightward) >= rect.end_col - rect.start_col) {
+ /* Scroll more than area; just erase the lot */
+ (*eraserect)(rect, 0, user);
+ return;
+ }
+
+ if(rightward >= 0) {
+ /* rect: [XXX................]
+ * src: [----------------]
+ * dest: [----------------]
+ */
+ dest.start_col = rect.start_col;
+ dest.end_col = rect.end_col - rightward;
+ src.start_col = rect.start_col + rightward;
+ src.end_col = rect.end_col;
+ }
+ else {
+ /* rect: [................XXX]
+ * src: [----------------]
+ * dest: [----------------]
+ */
+ int leftward = -rightward;
+ dest.start_col = rect.start_col + leftward;
+ dest.end_col = rect.end_col;
+ src.start_col = rect.start_col;
+ src.end_col = rect.end_col - leftward;
+ }
+
+ if(downward >= 0) {
+ dest.start_row = rect.start_row;
+ dest.end_row = rect.end_row - downward;
+ src.start_row = rect.start_row + downward;
+ src.end_row = rect.end_row;
+ }
+ else {
+ int upward = -downward;
+ dest.start_row = rect.start_row + upward;
+ dest.end_row = rect.end_row;
+ src.start_row = rect.start_row;
+ src.end_row = rect.end_row - upward;
+ }
+
+ if(moverect)
+ (*moverect)(dest, src, user);
+
+ if(downward > 0)
+ rect.start_row = rect.end_row - downward;
+ else if(downward < 0)
+ rect.end_row = rect.start_row - downward;
+
+ if(rightward > 0)
+ rect.start_col = rect.end_col - rightward;
+ else if(rightward < 0)
+ rect.end_col = rect.start_col - rightward;
+
+ (*eraserect)(rect, 0, user);
+}
+
+void vterm_copy_cells(VTermRect dest,
+ VTermRect src,
+ void (*copycell)(VTermPos dest, VTermPos src, void *user),
+ void *user)
+{
+ int downward = src.start_row - dest.start_row;
+ int rightward = src.start_col - dest.start_col;
+
+ int init_row, test_row, init_col, test_col;
+ int inc_row, inc_col;
+
+ if(downward < 0) {
+ init_row = dest.end_row - 1;
+ test_row = dest.start_row - 1;
+ inc_row = -1;
+ }
+ else /* downward >= 0 */ {
+ init_row = dest.start_row;
+ test_row = dest.end_row;
+ inc_row = +1;
+ }
+
+ if(rightward < 0) {
+ init_col = dest.end_col - 1;
+ test_col = dest.start_col - 1;
+ inc_col = -1;
+ }
+ else /* rightward >= 0 */ {
+ init_col = dest.start_col;
+ test_col = dest.end_col;
+ inc_col = +1;
+ }
+
+ VTermPos pos;
+ for(pos.row = init_row; pos.row != test_row; pos.row += inc_row)
+ for(pos.col = init_col; pos.col != test_col; pos.col += inc_col) {
+ VTermPos srcpos = { pos.row + downward, pos.col + rightward };
+ (*copycell)(pos, srcpos, user);
+ }
+}