1 /* TUI display source window. 2 3 Copyright (C) 1998-2004, 2007-2012 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 && s->filename != (char *) 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 char *name = alloca (strlen (s->filename) + 100); 67 68 sprintf (name, "%s:%d", s->filename, line_no); 69 print_sys_errmsg (name, errno); 70 } 71 ret = TUI_FAILURE; 72 } 73 else 74 { 75 if (s->line_charpos == 0) 76 find_source_lines (s, desc); 77 78 if (line_no < 1 || line_no > s->nlines) 79 { 80 close (desc); 81 printf_unfiltered ( 82 "Line number %d out of range; %s has %d lines.\n", 83 line_no, s->filename, s->nlines); 84 } 85 else if (lseek (desc, s->line_charpos[line_no - 1], 0) < 0) 86 { 87 close (desc); 88 perror_with_name (s->filename); 89 } 90 else 91 { 92 int offset, cur_line_no, cur_line, cur_len, threshold; 93 struct tui_gen_win_info *locator 94 = tui_locator_win_info_ptr (); 95 struct tui_source_info *src 96 = &TUI_SRC_WIN->detail.source_info; 97 98 if (TUI_SRC_WIN->generic.title) 99 xfree (TUI_SRC_WIN->generic.title); 100 TUI_SRC_WIN->generic.title = xstrdup (s->filename); 101 102 if (src->filename) 103 xfree (src->filename); 104 src->filename = xstrdup (s->filename); 105 106 /* Determine the threshold for the length of the 107 line and the offset to start the display. */ 108 offset = src->horizontal_offset; 109 threshold = (line_width - 1) + offset; 110 stream = fdopen (desc, FOPEN_RT); 111 clearerr (stream); 112 cur_line = 0; 113 src->gdbarch = get_objfile_arch (s->objfile); 114 src->start_line_or_addr.loa = LOA_LINE; 115 cur_line_no = src->start_line_or_addr.u.line_no = line_no; 116 if (offset > 0) 117 src_line = (char *) xmalloc ( 118 (threshold + 1) * sizeof (char)); 119 while (cur_line < nlines) 120 { 121 struct tui_win_element *element 122 = (struct tui_win_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 = ((struct tui_win_element *) 130 TUI_SRC_WIN->generic.content[ 131 cur_line])->which_element.source.line; 132 /* Init the line with the line number. */ 133 sprintf (src_line, "%-6d", cur_line_no); 134 cur_len = strlen (src_line); 135 i = cur_len - ((cur_len / tui_default_tab_len ()) 136 * tui_default_tab_len ()); 137 while (i < tui_default_tab_len ()) 138 { 139 src_line[cur_len] = ' '; 140 i++; 141 cur_len++; 142 } 143 src_line[cur_len] = (char) 0; 144 145 /* Set whether element is the execution point 146 and whether there is a break point on it. */ 147 element->which_element.source.line_or_addr.loa = 148 LOA_LINE; 149 element->which_element.source.line_or_addr.u.line_no = 150 cur_line_no; 151 element->which_element.source.is_exec_point = 152 (filename_cmp (((struct tui_win_element *) 153 locator->content[0])->which_element.locator.file_name, 154 s->filename) == 0 155 && cur_line_no == ((struct tui_win_element *) 156 locator->content[0])->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 (strlen (src_line) > offset) 222 strcpy (((struct tui_win_element *) 223 TUI_SRC_WIN->generic.content[cur_line])->which_element.source.line, 224 &src_line[offset]); 225 else 226 ((struct tui_win_element *) 227 TUI_SRC_WIN->generic.content[ 228 cur_line])->which_element.source.line[0] = (char) 0; 229 cur_line++; 230 cur_line_no++; 231 } 232 if (offset > 0) 233 xfree (src_line); 234 fclose (stream); 235 TUI_SRC_WIN->generic.content_size = nlines; 236 ret = TUI_SUCCESS; 237 } 238 } 239 } 240 } 241 return ret; 242 } 243 244 245 /* elz: This function sets the contents of the source window to empty 246 except for a line in the middle with a warning message about the 247 source not being available. This function is called by 248 tui_erase_source_contents(), which in turn is invoked when the 249 source files cannot be accessed. */ 250 251 void 252 tui_set_source_content_nil (struct tui_win_info *win_info, 253 char *warning_string) 254 { 255 int line_width; 256 int n_lines; 257 int curr_line = 0; 258 259 line_width = win_info->generic.width - 1; 260 n_lines = win_info->generic.height - 2; 261 262 /* Set to empty each line in the window, except for the one which 263 contains the message. */ 264 while (curr_line < win_info->generic.content_size) 265 { 266 /* Set the information related to each displayed line to null: 267 i.e. the line number is 0, there is no bp, it is not where 268 the program is stopped. */ 269 270 struct tui_win_element *element = 271 (struct tui_win_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 (char *fname) 336 { 337 return (TUI_SRC_WIN->generic.content_in_use 338 && (filename_cmp (((struct tui_win_element *) 339 (tui_locator_win_info_ptr ())-> 340 content[0])->which_element.locator.file_name, 341 fname) == 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_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