1 /* TUI display source window. 2 3 Copyright (C) 1998-2013 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 38 #include "gdb_string.h" 39 #include "gdb_curses.h" 40 41 /* Function to display source in the source window. */ 42 enum tui_status 43 tui_set_source_content (struct symtab *s, 44 int line_no, 45 int noerror) 46 { 47 enum tui_status ret = TUI_FAILURE; 48 49 if (s != (struct symtab *) NULL) 50 { 51 FILE *stream; 52 int i, desc, c, line_width, nlines; 53 char *src_line = 0; 54 55 if ((ret = tui_alloc_source_buffer (TUI_SRC_WIN)) == TUI_SUCCESS) 56 { 57 line_width = TUI_SRC_WIN->generic.width - 1; 58 /* Take hilite (window border) into account, when 59 calculating the number of lines. */ 60 nlines = (line_no + (TUI_SRC_WIN->generic.height - 2)) - line_no; 61 desc = open_source_file (s); 62 if (desc < 0) 63 { 64 if (!noerror) 65 { 66 const char *filename = symtab_to_filename_for_display (s); 67 char *name = alloca (strlen (filename) + 100); 68 69 sprintf (name, "%s:%d", filename, line_no); 70 print_sys_errmsg (name, errno); 71 } 72 ret = TUI_FAILURE; 73 } 74 else 75 { 76 if (s->line_charpos == 0) 77 find_source_lines (s, desc); 78 79 if (line_no < 1 || line_no > s->nlines) 80 { 81 close (desc); 82 printf_unfiltered ("Line number %d out of range; " 83 "%s has %d lines.\n", 84 line_no, 85 symtab_to_filename_for_display (s), 86 s->nlines); 87 } 88 else if (lseek (desc, s->line_charpos[line_no - 1], 0) < 0) 89 { 90 close (desc); 91 perror_with_name (symtab_to_filename_for_display (s)); 92 } 93 else 94 { 95 int offset, cur_line_no, cur_line, cur_len, threshold; 96 struct tui_gen_win_info *locator 97 = tui_locator_win_info_ptr (); 98 struct tui_source_info *src 99 = &TUI_SRC_WIN->detail.source_info; 100 const char *s_filename = symtab_to_filename_for_display (s); 101 102 if (TUI_SRC_WIN->generic.title) 103 xfree (TUI_SRC_WIN->generic.title); 104 TUI_SRC_WIN->generic.title = xstrdup (s_filename); 105 106 xfree (src->fullname); 107 src->fullname = xstrdup (symtab_to_fullname (s)); 108 109 /* Determine the threshold for the length of the 110 line and the offset to start the display. */ 111 offset = src->horizontal_offset; 112 threshold = (line_width - 1) + offset; 113 stream = fdopen (desc, FOPEN_RT); 114 clearerr (stream); 115 cur_line = 0; 116 src->gdbarch = get_objfile_arch (s->objfile); 117 src->start_line_or_addr.loa = LOA_LINE; 118 cur_line_no = src->start_line_or_addr.u.line_no = line_no; 119 if (offset > 0) 120 src_line = (char *) xmalloc ( 121 (threshold + 1) * sizeof (char)); 122 while (cur_line < nlines) 123 { 124 struct tui_win_element *element 125 = (struct tui_win_element *) 126 TUI_SRC_WIN->generic.content[cur_line]; 127 128 /* Get the first character in the line. */ 129 c = fgetc (stream); 130 131 if (offset == 0) 132 src_line = ((struct tui_win_element *) 133 TUI_SRC_WIN->generic.content[ 134 cur_line])->which_element.source.line; 135 /* Init the line with the line number. */ 136 sprintf (src_line, "%-6d", cur_line_no); 137 cur_len = strlen (src_line); 138 i = cur_len - ((cur_len / tui_default_tab_len ()) 139 * tui_default_tab_len ()); 140 while (i < tui_default_tab_len ()) 141 { 142 src_line[cur_len] = ' '; 143 i++; 144 cur_len++; 145 } 146 src_line[cur_len] = (char) 0; 147 148 /* Set whether element is the execution point 149 and whether there is a break point on it. */ 150 element->which_element.source.line_or_addr.loa = 151 LOA_LINE; 152 element->which_element.source.line_or_addr.u.line_no = 153 cur_line_no; 154 element->which_element.source.is_exec_point = 155 (filename_cmp (((struct tui_win_element *) 156 locator->content[0])->which_element.locator.full_name, 157 symtab_to_fullname (s)) == 0 158 && cur_line_no == ((struct tui_win_element *) 159 locator->content[0])->which_element.locator.line_no); 160 if (c != EOF) 161 { 162 i = strlen (src_line) - 1; 163 do 164 { 165 if ((c != '\n') && (c != '\r') 166 && (++i < threshold)) 167 { 168 if (c < 040 && c != '\t') 169 { 170 src_line[i++] = '^'; 171 src_line[i] = c + 0100; 172 } 173 else if (c == 0177) 174 { 175 src_line[i++] = '^'; 176 src_line[i] = '?'; 177 } 178 else 179 { /* Store the charcter in the 180 line buffer. If it is a tab, 181 then translate to the correct 182 number of chars so we don't 183 overwrite our buffer. */ 184 if (c == '\t') 185 { 186 int j, max_tab_len 187 = tui_default_tab_len (); 188 189 for (j = i - ((i / max_tab_len) 190 * max_tab_len); 191 j < max_tab_len 192 && i < threshold; 193 i++, j++) 194 src_line[i] = ' '; 195 i--; 196 } 197 else 198 src_line[i] = c; 199 } 200 src_line[i + 1] = 0; 201 } 202 else 203 { /* If we have not reached EOL, then 204 eat chars until we do. */ 205 while (c != EOF && c != '\n' && c != '\r') 206 c = fgetc (stream); 207 /* Handle non-'\n' end-of-line. */ 208 if (c == '\r' 209 && (c = fgetc (stream)) != '\n' 210 && c != EOF) 211 { 212 ungetc (c, stream); 213 c = '\r'; 214 } 215 216 } 217 } 218 while (c != EOF && c != '\n' && c != '\r' 219 && i < threshold 220 && (c = fgetc (stream))); 221 } 222 /* Now copy the line taking the offset into 223 account. */ 224 if (strlen (src_line) > offset) 225 strcpy (((struct tui_win_element *) 226 TUI_SRC_WIN->generic.content[cur_line])->which_element.source.line, 227 &src_line[offset]); 228 else 229 ((struct tui_win_element *) 230 TUI_SRC_WIN->generic.content[ 231 cur_line])->which_element.source.line[0] = (char) 0; 232 cur_line++; 233 cur_line_no++; 234 } 235 if (offset > 0) 236 xfree (src_line); 237 fclose (stream); 238 TUI_SRC_WIN->generic.content_size = nlines; 239 ret = TUI_SUCCESS; 240 } 241 } 242 } 243 } 244 return ret; 245 } 246 247 248 /* elz: This function sets the contents of the source window to empty 249 except for a line in the middle with a warning message about the 250 source not being available. This function is called by 251 tui_erase_source_contents(), which in turn is invoked when the 252 source files cannot be accessed. */ 253 254 void 255 tui_set_source_content_nil (struct tui_win_info *win_info, 256 char *warning_string) 257 { 258 int line_width; 259 int n_lines; 260 int curr_line = 0; 261 262 line_width = win_info->generic.width - 1; 263 n_lines = win_info->generic.height - 2; 264 265 /* Set to empty each line in the window, except for the one which 266 contains the message. */ 267 while (curr_line < win_info->generic.content_size) 268 { 269 /* Set the information related to each displayed line to null: 270 i.e. the line number is 0, there is no bp, it is not where 271 the program is stopped. */ 272 273 struct tui_win_element *element = 274 (struct tui_win_element *) win_info->generic.content[curr_line]; 275 276 element->which_element.source.line_or_addr.loa = LOA_LINE; 277 element->which_element.source.line_or_addr.u.line_no = 0; 278 element->which_element.source.is_exec_point = FALSE; 279 element->which_element.source.has_break = FALSE; 280 281 /* Set the contents of the line to blank. */ 282 element->which_element.source.line[0] = (char) 0; 283 284 /* If the current line is in the middle of the screen, then we 285 want to display the 'no source available' message in it. 286 Note: the 'weird' arithmetic with the line width and height 287 comes from the function tui_erase_source_content(). We need 288 to keep the screen and the window's actual contents in 289 synch. */ 290 291 if (curr_line == (n_lines / 2 + 1)) 292 { 293 int i; 294 int xpos; 295 int warning_length = strlen (warning_string); 296 char *src_line; 297 298 src_line = element->which_element.source.line; 299 300 if (warning_length >= ((line_width - 1) / 2)) 301 xpos = 1; 302 else 303 xpos = (line_width - 1) / 2 - warning_length; 304 305 for (i = 0; i < xpos; i++) 306 src_line[i] = ' '; 307 308 sprintf (src_line + i, "%s", warning_string); 309 310 for (i = xpos + warning_length; i < line_width; i++) 311 src_line[i] = ' '; 312 313 src_line[i] = '\n'; 314 315 } /* end if */ 316 317 curr_line++; 318 319 } /* end while */ 320 } 321 322 323 /* Function to display source in the source window. This function 324 initializes the horizontal scroll to 0. */ 325 void 326 tui_show_symtab_source (struct gdbarch *gdbarch, struct symtab *s, 327 struct tui_line_or_address line, 328 int noerror) 329 { 330 TUI_SRC_WIN->detail.source_info.horizontal_offset = 0; 331 tui_update_source_window_as_is (TUI_SRC_WIN, gdbarch, s, line, noerror); 332 } 333 334 335 /* Answer whether the source is currently displayed in the source 336 window. */ 337 int 338 tui_source_is_displayed (const char *fullname) 339 { 340 return (TUI_SRC_WIN != NULL 341 && TUI_SRC_WIN->generic.content_in_use 342 && (filename_cmp (((struct tui_win_element *) 343 (tui_locator_win_info_ptr ())-> 344 content[0])->which_element.locator.full_name, 345 fullname) == 0)); 346 } 347 348 349 /* Scroll the source forward or backward vertically. */ 350 void 351 tui_vertical_source_scroll (enum tui_scroll_direction scroll_direction, 352 int num_to_scroll) 353 { 354 if (TUI_SRC_WIN->generic.content != NULL) 355 { 356 struct tui_line_or_address l; 357 struct symtab *s; 358 tui_win_content content = (tui_win_content) TUI_SRC_WIN->generic.content; 359 struct symtab_and_line cursal = get_current_source_symtab_and_line (); 360 361 if (cursal.symtab == (struct symtab *) NULL) 362 s = find_pc_symtab (get_frame_pc (get_selected_frame (NULL))); 363 else 364 s = cursal.symtab; 365 366 l.loa = LOA_LINE; 367 if (scroll_direction == FORWARD_SCROLL) 368 { 369 l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no 370 + num_to_scroll; 371 if (l.u.line_no > s->nlines) 372 /* line = s->nlines - win_info->generic.content_size + 1; */ 373 /* elz: fix for dts 23398. */ 374 l.u.line_no 375 = content[0]->which_element.source.line_or_addr.u.line_no; 376 } 377 else 378 { 379 l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no 380 - num_to_scroll; 381 if (l.u.line_no <= 0) 382 l.u.line_no = 1; 383 } 384 385 print_source_lines (s, l.u.line_no, l.u.line_no + 1, 0); 386 } 387 } 388