1#include "vterm_internal.h"
2
3#include <stdio.h>
4#include <stdlib.h>
5#include <stdarg.h>
6#include <string.h>
7
8/*****************
9 * API functions *
10 *****************/
11
12static void *default_malloc(size_t size, void *allocdata)
13{
14  void *ptr = malloc(size);
15  if(ptr)
16    memset(ptr, 0, size);
17  return ptr;
18}
19
20static void default_free(void *ptr, void *allocdata)
21{
22  free(ptr);
23}
24
25static VTermAllocatorFunctions default_allocator = {
26  .malloc = &default_malloc,
27  .free   = &default_free,
28};
29
30VTerm *vterm_new(int rows, int cols)
31{
32  return vterm_new_with_allocator(rows, cols, &default_allocator, NULL);
33}
34
35VTerm *vterm_new_with_allocator(int rows, int cols, VTermAllocatorFunctions *funcs, void *allocdata)
36{
37  /* Need to bootstrap using the allocator function directly */
38  VTerm *vt = (*funcs->malloc)(sizeof(VTerm), allocdata);
39
40  vt->allocator = funcs;
41  vt->allocdata = allocdata;
42
43  vt->rows = rows;
44  vt->cols = cols;
45
46  vt->parser_state = NORMAL;
47
48  vt->strbuffer_len = 64;
49  vt->strbuffer_cur = 0;
50  vt->strbuffer = vterm_allocator_malloc(vt, vt->strbuffer_len);
51
52  vt->outbuffer_len = 64;
53  vt->outbuffer_cur = 0;
54  vt->outbuffer = vterm_allocator_malloc(vt, vt->outbuffer_len);
55
56  return vt;
57}
58
59void vterm_free(VTerm *vt)
60{
61  if(vt->screen)
62    vterm_screen_free(vt->screen);
63
64  if(vt->state)
65    vterm_state_free(vt->state);
66
67  vterm_allocator_free(vt, vt->strbuffer);
68  vterm_allocator_free(vt, vt->outbuffer);
69
70  vterm_allocator_free(vt, vt);
71}
72
73void *vterm_allocator_malloc(VTerm *vt, size_t size)
74{
75  return (*vt->allocator->malloc)(size, vt->allocdata);
76}
77
78void vterm_allocator_free(VTerm *vt, void *ptr)
79{
80  (*vt->allocator->free)(ptr, vt->allocdata);
81}
82
83void vterm_get_size(VTerm *vt, int *rowsp, int *colsp)
84{
85  if(rowsp)
86    *rowsp = vt->rows;
87  if(colsp)
88    *colsp = vt->cols;
89}
90
91void vterm_set_size(VTerm *vt, int rows, int cols)
92{
93  vt->rows = rows;
94  vt->cols = cols;
95
96  if(vt->parser_callbacks && vt->parser_callbacks->resize)
97    (*vt->parser_callbacks->resize)(rows, cols, vt->cbdata);
98}
99
100void vterm_set_parser_callbacks(VTerm *vt, const VTermParserCallbacks *callbacks, void *user)
101{
102  vt->parser_callbacks = callbacks;
103  vt->cbdata = user;
104}
105
106void vterm_parser_set_utf8(VTerm *vt, int is_utf8)
107{
108  vt->is_utf8 = is_utf8;
109}
110
111void vterm_push_output_bytes(VTerm *vt, const char *bytes, size_t len)
112{
113  if(len > vt->outbuffer_len - vt->outbuffer_cur) {
114    fprintf(stderr, "vterm_push_output(): buffer overflow; truncating output\n");
115    len = vt->outbuffer_len - vt->outbuffer_cur;
116  }
117
118  memcpy(vt->outbuffer + vt->outbuffer_cur, bytes, len);
119  vt->outbuffer_cur += len;
120}
121
122void vterm_push_output_vsprintf(VTerm *vt, const char *format, va_list args)
123{
124  int written = vsnprintf(vt->outbuffer + vt->outbuffer_cur,
125      vt->outbuffer_len - vt->outbuffer_cur,
126      format, args);
127  vt->outbuffer_cur += written;
128}
129
130void vterm_push_output_sprintf(VTerm *vt, const char *format, ...)
131{
132  va_list args;
133  va_start(args, format);
134  vterm_push_output_vsprintf(vt, format, args);
135  va_end(args);
136}
137
138size_t vterm_output_bufferlen(VTerm *vt)
139{
140  return vterm_output_get_buffer_current(vt);
141}
142
143size_t vterm_output_get_buffer_size(VTerm *vt)
144{
145  return vt->outbuffer_len;
146}
147
148size_t vterm_output_get_buffer_current(VTerm *vt)
149{
150  return vt->outbuffer_cur;
151}
152
153size_t vterm_output_get_buffer_remaining(VTerm *vt)
154{
155  return vt->outbuffer_len - vt->outbuffer_cur;
156}
157
158size_t vterm_output_bufferread(VTerm *vt, char *buffer, size_t len)
159{
160  if(len > vt->outbuffer_cur)
161    len = vt->outbuffer_cur;
162
163  memcpy(buffer, vt->outbuffer, len);
164
165  if(len < vt->outbuffer_cur)
166    memmove(vt->outbuffer, vt->outbuffer + len, vt->outbuffer_cur - len);
167
168  vt->outbuffer_cur -= len;
169
170  return len;
171}
172
173VTermValueType vterm_get_attr_type(VTermAttr attr)
174{
175  switch(attr) {
176    case VTERM_ATTR_BOLD:       return VTERM_VALUETYPE_BOOL;
177    case VTERM_ATTR_UNDERLINE:  return VTERM_VALUETYPE_INT;
178    case VTERM_ATTR_ITALIC:     return VTERM_VALUETYPE_BOOL;
179    case VTERM_ATTR_BLINK:      return VTERM_VALUETYPE_BOOL;
180    case VTERM_ATTR_REVERSE:    return VTERM_VALUETYPE_BOOL;
181    case VTERM_ATTR_STRIKE:     return VTERM_VALUETYPE_BOOL;
182    case VTERM_ATTR_FONT:       return VTERM_VALUETYPE_INT;
183    case VTERM_ATTR_FOREGROUND: return VTERM_VALUETYPE_COLOR;
184    case VTERM_ATTR_BACKGROUND: return VTERM_VALUETYPE_COLOR;
185  }
186  return 0; /* UNREACHABLE */
187}
188
189VTermValueType vterm_get_prop_type(VTermProp prop)
190{
191  switch(prop) {
192    case VTERM_PROP_CURSORVISIBLE: return VTERM_VALUETYPE_BOOL;
193    case VTERM_PROP_CURSORBLINK:   return VTERM_VALUETYPE_BOOL;
194    case VTERM_PROP_ALTSCREEN:     return VTERM_VALUETYPE_BOOL;
195    case VTERM_PROP_TITLE:         return VTERM_VALUETYPE_STRING;
196    case VTERM_PROP_ICONNAME:      return VTERM_VALUETYPE_STRING;
197    case VTERM_PROP_REVERSE:       return VTERM_VALUETYPE_BOOL;
198    case VTERM_PROP_CURSORSHAPE:   return VTERM_VALUETYPE_INT;
199  }
200  return 0; /* UNREACHABLE */
201}
202
203void vterm_scroll_rect(VTermRect rect,
204    int downward,
205    int rightward,
206    int (*moverect)(VTermRect src, VTermRect dest, void *user),
207    int (*eraserect)(VTermRect rect, void *user),
208    void *user)
209{
210  VTermRect src;
211  VTermRect dest;
212
213  if(abs(downward)  >= rect.end_row - rect.start_row ||
214     abs(rightward) >= rect.end_col - rect.start_col) {
215    /* Scroll more than area; just erase the lot */
216    (*eraserect)(rect, user);
217    return;
218  }
219
220  if(rightward >= 0) {
221    /* rect: [XXX................]
222     * src:     [----------------]
223     * dest: [----------------]
224     */
225    dest.start_col = rect.start_col;
226    dest.end_col   = rect.end_col   - rightward;
227    src.start_col  = rect.start_col + rightward;
228    src.end_col    = rect.end_col;
229  }
230  else {
231    /* rect: [................XXX]
232     * src:  [----------------]
233     * dest:    [----------------]
234     */
235    int leftward = -rightward;
236    dest.start_col = rect.start_col + leftward;
237    dest.end_col   = rect.end_col;
238    src.start_col  = rect.start_col;
239    src.end_col    = rect.end_col - leftward;
240  }
241
242  if(downward >= 0) {
243    dest.start_row = rect.start_row;
244    dest.end_row   = rect.end_row   - downward;
245    src.start_row  = rect.start_row + downward;
246    src.end_row    = rect.end_row;
247  }
248  else {
249    int upward = -downward;
250    dest.start_row = rect.start_row + upward;
251    dest.end_row   = rect.end_row;
252    src.start_row  = rect.start_row;
253    src.end_row    = rect.end_row - upward;
254  }
255
256  if(moverect)
257    (*moverect)(dest, src, user);
258
259  if(downward > 0)
260    rect.start_row = rect.end_row - downward;
261  else if(downward < 0)
262    rect.end_row = rect.start_row - downward;
263
264  if(rightward > 0)
265    rect.start_col = rect.end_col - rightward;
266  else if(rightward < 0)
267    rect.end_col = rect.start_col - rightward;
268
269  (*eraserect)(rect, user);
270}
271
272void vterm_copy_cells(VTermRect dest,
273    VTermRect src,
274    void (*copycell)(VTermPos dest, VTermPos src, void *user),
275    void *user)
276{
277  int downward  = src.start_row - dest.start_row;
278  int rightward = src.start_col - dest.start_col;
279
280  int init_row, test_row, init_col, test_col;
281  int inc_row, inc_col;
282
283  VTermPos pos;
284
285  if(downward < 0) {
286    init_row = dest.end_row - 1;
287    test_row = dest.start_row - 1;
288    inc_row = -1;
289  }
290  else if(downward == 0) {
291    init_row = dest.start_row;
292    test_row = dest.end_row;
293    inc_row = +1;
294  }
295  else /* downward > 0 */ {
296    init_row = dest.start_row;
297    test_row = dest.end_row;
298    inc_row = +1;
299  }
300
301  if(rightward < 0) {
302    init_col = dest.end_col - 1;
303    test_col = dest.start_col - 1;
304    inc_col = -1;
305  }
306  else if(rightward == 0) {
307    init_col = dest.start_col;
308    test_col = dest.end_col;
309    inc_col = +1;
310  }
311  else /* rightward > 0 */ {
312    init_col = dest.start_col;
313    test_col = dest.end_col;
314    inc_col = +1;
315  }
316
317  for(pos.row = init_row; pos.row != test_row; pos.row += inc_row)
318    for(pos.col = init_col; pos.col != test_col; pos.col += inc_col) {
319      VTermPos srcpos = { pos.row + downward, pos.col + rightward };
320      (*copycell)(pos, srcpos, user);
321    }
322}
323