1 /* TUI display source window. 2 3 Copyright (C) 1998-2016 Free Software Foundation, Inc. 4 5 Contributed by Hewlett-Packard Company. 6 7 This file is part of GDB. 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 21 22 #include "defs.h" 23 #include <ctype.h> 24 #include "symtab.h" 25 #include "frame.h" 26 #include "breakpoint.h" 27 #include "source.h" 28 #include "symtab.h" 29 #include "objfiles.h" 30 #include "filenames.h" 31 32 #include "tui/tui.h" 33 #include "tui/tui-data.h" 34 #include "tui/tui-stack.h" 35 #include "tui/tui-winsource.h" 36 #include "tui/tui-source.h" 37 #include "gdb_curses.h" 38 39 /* Function to display source in the source window. */ 40 enum tui_status 41 tui_set_source_content (struct symtab *s, 42 int line_no, 43 int noerror) 44 { 45 enum tui_status ret = TUI_FAILURE; 46 47 if (s != (struct symtab *) NULL) 48 { 49 FILE *stream; 50 int i, desc, c, line_width, nlines; 51 char *src_line = 0; 52 53 if ((ret = tui_alloc_source_buffer (TUI_SRC_WIN)) == TUI_SUCCESS) 54 { 55 line_width = TUI_SRC_WIN->generic.width - 1; 56 /* Take hilite (window border) into account, when 57 calculating the number of lines. */ 58 nlines = (line_no + (TUI_SRC_WIN->generic.height - 2)) - line_no; 59 desc = open_source_file (s); 60 if (desc < 0) 61 { 62 if (!noerror) 63 { 64 const char *filename = symtab_to_filename_for_display (s); 65 char *name = (char *) alloca (strlen (filename) + 100); 66 67 sprintf (name, "%s:%d", filename, line_no); 68 print_sys_errmsg (name, errno); 69 } 70 ret = TUI_FAILURE; 71 } 72 else 73 { 74 if (s->line_charpos == 0) 75 find_source_lines (s, desc); 76 77 if (line_no < 1 || line_no > s->nlines) 78 { 79 close (desc); 80 printf_unfiltered ("Line number %d out of range; " 81 "%s has %d lines.\n", 82 line_no, 83 symtab_to_filename_for_display (s), 84 s->nlines); 85 } 86 else if (lseek (desc, s->line_charpos[line_no - 1], 0) < 0) 87 { 88 close (desc); 89 perror_with_name (symtab_to_filename_for_display (s)); 90 } 91 else 92 { 93 int offset, cur_line_no, cur_line, cur_len, threshold; 94 struct tui_gen_win_info *locator 95 = tui_locator_win_info_ptr (); 96 struct tui_source_info *src 97 = &TUI_SRC_WIN->detail.source_info; 98 const char *s_filename = symtab_to_filename_for_display (s); 99 100 if (TUI_SRC_WIN->generic.title) 101 xfree (TUI_SRC_WIN->generic.title); 102 TUI_SRC_WIN->generic.title = xstrdup (s_filename); 103 104 xfree (src->fullname); 105 src->fullname = xstrdup (symtab_to_fullname (s)); 106 107 /* Determine the threshold for the length of the 108 line and the offset to start the display. */ 109 offset = src->horizontal_offset; 110 threshold = (line_width - 1) + offset; 111 stream = fdopen (desc, FOPEN_RT); 112 clearerr (stream); 113 cur_line = 0; 114 src->gdbarch = get_objfile_arch (SYMTAB_OBJFILE (s)); 115 src->start_line_or_addr.loa = LOA_LINE; 116 cur_line_no = src->start_line_or_addr.u.line_no = line_no; 117 if (offset > 0) 118 src_line = (char *) xmalloc ( 119 (threshold + 1) * sizeof (char)); 120 while (cur_line < nlines) 121 { 122 struct tui_win_element *element 123 = TUI_SRC_WIN->generic.content[cur_line]; 124 125 /* Get the first character in the line. */ 126 c = fgetc (stream); 127 128 if (offset == 0) 129 src_line = TUI_SRC_WIN->generic.content[cur_line] 130 ->which_element.source.line; 131 /* Init the line with the line number. */ 132 sprintf (src_line, "%-6d", cur_line_no); 133 cur_len = strlen (src_line); 134 i = cur_len - ((cur_len / tui_default_tab_len ()) 135 * tui_default_tab_len ()); 136 while (i < tui_default_tab_len ()) 137 { 138 src_line[cur_len] = ' '; 139 i++; 140 cur_len++; 141 } 142 src_line[cur_len] = (char) 0; 143 144 /* Set whether element is the execution point 145 and whether there is a break point on it. */ 146 element->which_element.source.line_or_addr.loa = 147 LOA_LINE; 148 element->which_element.source.line_or_addr.u.line_no = 149 cur_line_no; 150 element->which_element.source.is_exec_point = 151 (filename_cmp (locator->content[0] 152 ->which_element.locator.full_name, 153 symtab_to_fullname (s)) == 0 154 && cur_line_no 155 == locator->content[0] 156 ->which_element.locator.line_no); 157 if (c != EOF) 158 { 159 i = strlen (src_line) - 1; 160 do 161 { 162 if ((c != '\n') && (c != '\r') 163 && (++i < threshold)) 164 { 165 if (c < 040 && c != '\t') 166 { 167 src_line[i++] = '^'; 168 src_line[i] = c + 0100; 169 } 170 else if (c == 0177) 171 { 172 src_line[i++] = '^'; 173 src_line[i] = '?'; 174 } 175 else 176 { /* Store the charcter in the 177 line buffer. If it is a tab, 178 then translate to the correct 179 number of chars so we don't 180 overwrite our buffer. */ 181 if (c == '\t') 182 { 183 int j, max_tab_len 184 = tui_default_tab_len (); 185 186 for (j = i - ((i / max_tab_len) 187 * max_tab_len); 188 j < max_tab_len 189 && i < threshold; 190 i++, j++) 191 src_line[i] = ' '; 192 i--; 193 } 194 else 195 src_line[i] = c; 196 } 197 src_line[i + 1] = 0; 198 } 199 else 200 { /* If we have not reached EOL, then 201 eat chars until we do. */ 202 while (c != EOF && c != '\n' && c != '\r') 203 c = fgetc (stream); 204 /* Handle non-'\n' end-of-line. */ 205 if (c == '\r' 206 && (c = fgetc (stream)) != '\n' 207 && c != EOF) 208 { 209 ungetc (c, stream); 210 c = '\r'; 211 } 212 213 } 214 } 215 while (c != EOF && c != '\n' && c != '\r' 216 && i < threshold 217 && (c = fgetc (stream))); 218 } 219 /* Now copy the line taking the offset into 220 account. */ 221 if (offset == 0) 222 ; 223 else if (strlen (src_line) > offset) 224 strcpy (TUI_SRC_WIN->generic.content[cur_line] 225 ->which_element.source.line, 226 &src_line[offset]); 227 else 228 TUI_SRC_WIN->generic.content[cur_line] 229 ->which_element.source.line[0] = (char) 0; 230 cur_line++; 231 cur_line_no++; 232 } 233 if (offset > 0) 234 xfree (src_line); 235 fclose (stream); 236 TUI_SRC_WIN->generic.content_size = nlines; 237 ret = TUI_SUCCESS; 238 } 239 } 240 } 241 } 242 return ret; 243 } 244 245 246 /* elz: This function sets the contents of the source window to empty 247 except for a line in the middle with a warning message about the 248 source not being available. This function is called by 249 tui_erase_source_contents(), which in turn is invoked when the 250 source files cannot be accessed. */ 251 252 void 253 tui_set_source_content_nil (struct tui_win_info *win_info, 254 char *warning_string) 255 { 256 int line_width; 257 int n_lines; 258 int curr_line = 0; 259 260 line_width = win_info->generic.width - 1; 261 n_lines = win_info->generic.height - 2; 262 263 /* Set to empty each line in the window, except for the one which 264 contains the message. */ 265 while (curr_line < win_info->generic.content_size) 266 { 267 /* Set the information related to each displayed line to null: 268 i.e. the line number is 0, there is no bp, it is not where 269 the program is stopped. */ 270 271 struct tui_win_element *element = win_info->generic.content[curr_line]; 272 273 element->which_element.source.line_or_addr.loa = LOA_LINE; 274 element->which_element.source.line_or_addr.u.line_no = 0; 275 element->which_element.source.is_exec_point = FALSE; 276 element->which_element.source.has_break = FALSE; 277 278 /* Set the contents of the line to blank. */ 279 element->which_element.source.line[0] = (char) 0; 280 281 /* If the current line is in the middle of the screen, then we 282 want to display the 'no source available' message in it. 283 Note: the 'weird' arithmetic with the line width and height 284 comes from the function tui_erase_source_content(). We need 285 to keep the screen and the window's actual contents in 286 synch. */ 287 288 if (curr_line == (n_lines / 2 + 1)) 289 { 290 int i; 291 int xpos; 292 int warning_length = strlen (warning_string); 293 char *src_line; 294 295 src_line = element->which_element.source.line; 296 297 if (warning_length >= ((line_width - 1) / 2)) 298 xpos = 1; 299 else 300 xpos = (line_width - 1) / 2 - warning_length; 301 302 for (i = 0; i < xpos; i++) 303 src_line[i] = ' '; 304 305 sprintf (src_line + i, "%s", warning_string); 306 307 for (i = xpos + warning_length; i < line_width; i++) 308 src_line[i] = ' '; 309 310 src_line[i] = '\n'; 311 312 } /* end if */ 313 314 curr_line++; 315 316 } /* end while */ 317 } 318 319 320 /* Function to display source in the source window. This function 321 initializes the horizontal scroll to 0. */ 322 void 323 tui_show_symtab_source (struct gdbarch *gdbarch, struct symtab *s, 324 struct tui_line_or_address line, 325 int noerror) 326 { 327 TUI_SRC_WIN->detail.source_info.horizontal_offset = 0; 328 tui_update_source_window_as_is (TUI_SRC_WIN, gdbarch, s, line, noerror); 329 } 330 331 332 /* Answer whether the source is currently displayed in the source 333 window. */ 334 int 335 tui_source_is_displayed (const char *fullname) 336 { 337 return (TUI_SRC_WIN != NULL 338 && TUI_SRC_WIN->generic.content_in_use 339 && (filename_cmp (tui_locator_win_info_ptr ()->content[0] 340 ->which_element.locator.full_name, 341 fullname) == 0)); 342 } 343 344 345 /* Scroll the source forward or backward vertically. */ 346 void 347 tui_vertical_source_scroll (enum tui_scroll_direction scroll_direction, 348 int num_to_scroll) 349 { 350 if (TUI_SRC_WIN->generic.content != NULL) 351 { 352 struct tui_line_or_address l; 353 struct symtab *s; 354 tui_win_content content = (tui_win_content) TUI_SRC_WIN->generic.content; 355 struct symtab_and_line cursal = get_current_source_symtab_and_line (); 356 357 if (cursal.symtab == (struct symtab *) NULL) 358 s = find_pc_line_symtab (get_frame_pc (get_selected_frame (NULL))); 359 else 360 s = cursal.symtab; 361 362 l.loa = LOA_LINE; 363 if (scroll_direction == FORWARD_SCROLL) 364 { 365 l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no 366 + num_to_scroll; 367 if (l.u.line_no > s->nlines) 368 /* line = s->nlines - win_info->generic.content_size + 1; */ 369 /* elz: fix for dts 23398. */ 370 l.u.line_no 371 = content[0]->which_element.source.line_or_addr.u.line_no; 372 } 373 else 374 { 375 l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no 376 - num_to_scroll; 377 if (l.u.line_no <= 0) 378 l.u.line_no = 1; 379 } 380 381 print_source_lines (s, l.u.line_no, l.u.line_no + 1, 0); 382 } 383 } 384