1 /* TUI display source window. 2 3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009, 4 2010 Free Software Foundation, Inc. 5 6 Contributed by Hewlett-Packard Company. 7 8 This file is part of GDB. 9 10 This program is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License as published by 12 the Free Software Foundation; either version 3 of the License, or 13 (at your option) any later version. 14 15 This program is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License for more details. 19 20 You should have received a copy of the GNU General Public License 21 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 22 23 #include "defs.h" 24 #include <ctype.h> 25 #include "symtab.h" 26 #include "frame.h" 27 #include "breakpoint.h" 28 #include "source.h" 29 #include "symtab.h" 30 #include "objfiles.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 = tui_locator_win_info_ptr (); 94 struct tui_source_info *src = &TUI_SRC_WIN->detail.source_info; 95 96 if (TUI_SRC_WIN->generic.title) 97 xfree (TUI_SRC_WIN->generic.title); 98 TUI_SRC_WIN->generic.title = xstrdup (s->filename); 99 100 if (src->filename) 101 xfree (src->filename); 102 src->filename = xstrdup (s->filename); 103 104 /* Determine the threshold for the length of the 105 line and the offset to start the display. */ 106 offset = src->horizontal_offset; 107 threshold = (line_width - 1) + offset; 108 stream = fdopen (desc, FOPEN_RT); 109 clearerr (stream); 110 cur_line = 0; 111 src->gdbarch = get_objfile_arch (s->objfile); 112 src->start_line_or_addr.loa = LOA_LINE; 113 cur_line_no = src->start_line_or_addr.u.line_no = line_no; 114 if (offset > 0) 115 src_line = (char *) xmalloc ( 116 (threshold + 1) * sizeof (char)); 117 while (cur_line < nlines) 118 { 119 struct tui_win_element *element = (struct tui_win_element *) 120 TUI_SRC_WIN->generic.content[cur_line]; 121 122 /* Get the first character in the line. */ 123 c = fgetc (stream); 124 125 if (offset == 0) 126 src_line = ((struct tui_win_element *) 127 TUI_SRC_WIN->generic.content[ 128 cur_line])->which_element.source.line; 129 /* Init the line with the line number. */ 130 sprintf (src_line, "%-6d", cur_line_no); 131 cur_len = strlen (src_line); 132 i = cur_len - 133 ((cur_len / tui_default_tab_len ()) * tui_default_tab_len ()); 134 while (i < tui_default_tab_len ()) 135 { 136 src_line[cur_len] = ' '; 137 i++; 138 cur_len++; 139 } 140 src_line[cur_len] = (char) 0; 141 142 /* Set whether element is the execution point 143 and whether there is a break point on it. */ 144 element->which_element.source.line_or_addr.loa = 145 LOA_LINE; 146 element->which_element.source.line_or_addr.u.line_no = 147 cur_line_no; 148 element->which_element.source.is_exec_point = 149 (strcmp (((struct tui_win_element *) 150 locator->content[0])->which_element.locator.file_name, 151 s->filename) == 0 152 && cur_line_no == ((struct tui_win_element *) 153 locator->content[0])->which_element.locator.line_no); 154 if (c != EOF) 155 { 156 i = strlen (src_line) - 1; 157 do 158 { 159 if ((c != '\n') && (c != '\r') 160 && (++i < threshold)) 161 { 162 if (c < 040 && c != '\t') 163 { 164 src_line[i++] = '^'; 165 src_line[i] = c + 0100; 166 } 167 else if (c == 0177) 168 { 169 src_line[i++] = '^'; 170 src_line[i] = '?'; 171 } 172 else 173 { /* Store the charcter in the 174 line buffer. If it is a tab, 175 then translate to the correct 176 number of chars so we don't 177 overwrite our buffer. */ 178 if (c == '\t') 179 { 180 int j, max_tab_len = tui_default_tab_len (); 181 182 for (j = i - ((i / max_tab_len) * max_tab_len); 183 j < max_tab_len 184 && i < threshold; 185 i++, j++) 186 src_line[i] = ' '; 187 i--; 188 } 189 else 190 src_line[i] = c; 191 } 192 src_line[i + 1] = 0; 193 } 194 else 195 { /* If we have not reached EOL, then 196 eat chars until we do. */ 197 while (c != EOF && c != '\n' && c != '\r') 198 c = fgetc (stream); 199 /* Handle non-'\n' end-of-line. */ 200 if (c == '\r' 201 && (c = fgetc (stream)) != '\n' 202 && c != EOF) 203 { 204 ungetc (c, stream); 205 c = '\r'; 206 } 207 208 } 209 } 210 while (c != EOF && c != '\n' && c != '\r' 211 && i < threshold 212 && (c = fgetc (stream))); 213 } 214 /* Now copy the line taking the offset into 215 account. */ 216 if (strlen (src_line) > offset) 217 strcpy (((struct tui_win_element *) TUI_SRC_WIN->generic.content[ 218 cur_line])->which_element.source.line, 219 &src_line[offset]); 220 else 221 ((struct tui_win_element *) 222 TUI_SRC_WIN->generic.content[ 223 cur_line])->which_element.source.line[0] = (char) 0; 224 cur_line++; 225 cur_line_no++; 226 } 227 if (offset > 0) 228 xfree (src_line); 229 fclose (stream); 230 TUI_SRC_WIN->generic.content_size = nlines; 231 ret = TUI_SUCCESS; 232 } 233 } 234 } 235 } 236 return ret; 237 } 238 239 240 /* elz: This function sets the contents of the source window to empty 241 except for a line in the middle with a warning message about the 242 source not being available. This function is called by 243 tui_erase_source_contents(), which in turn is invoked when the 244 source files cannot be accessed. */ 245 246 void 247 tui_set_source_content_nil (struct tui_win_info *win_info, 248 char *warning_string) 249 { 250 int line_width; 251 int n_lines; 252 int curr_line = 0; 253 254 line_width = win_info->generic.width - 1; 255 n_lines = win_info->generic.height - 2; 256 257 /* Set to empty each line in the window, except for the one which 258 contains the message. */ 259 while (curr_line < win_info->generic.content_size) 260 { 261 /* Set the information related to each displayed line to null: 262 i.e. the line number is 0, there is no bp, it is not where 263 the program is stopped. */ 264 265 struct tui_win_element *element = 266 (struct tui_win_element *) win_info->generic.content[curr_line]; 267 268 element->which_element.source.line_or_addr.loa = LOA_LINE; 269 element->which_element.source.line_or_addr.u.line_no = 0; 270 element->which_element.source.is_exec_point = FALSE; 271 element->which_element.source.has_break = FALSE; 272 273 /* Set the contents of the line to blank. */ 274 element->which_element.source.line[0] = (char) 0; 275 276 /* If the current line is in the middle of the screen, then we 277 want to display the 'no source available' message in it. 278 Note: the 'weird' arithmetic with the line width and height 279 comes from the function tui_erase_source_content(). We need 280 to keep the screen and the window's actual contents in 281 synch. */ 282 283 if (curr_line == (n_lines / 2 + 1)) 284 { 285 int i; 286 int xpos; 287 int warning_length = strlen (warning_string); 288 char *src_line; 289 290 src_line = element->which_element.source.line; 291 292 if (warning_length >= ((line_width - 1) / 2)) 293 xpos = 1; 294 else 295 xpos = (line_width - 1) / 2 - warning_length; 296 297 for (i = 0; i < xpos; i++) 298 src_line[i] = ' '; 299 300 sprintf (src_line + i, "%s", warning_string); 301 302 for (i = xpos + warning_length; i < line_width; i++) 303 src_line[i] = ' '; 304 305 src_line[i] = '\n'; 306 307 } /* end if */ 308 309 curr_line++; 310 311 } /* end while */ 312 } 313 314 315 /* Function to display source in the source window. This function 316 initializes the horizontal scroll to 0. */ 317 void 318 tui_show_symtab_source (struct gdbarch *gdbarch, struct symtab *s, 319 struct tui_line_or_address line, 320 int noerror) 321 { 322 TUI_SRC_WIN->detail.source_info.horizontal_offset = 0; 323 tui_update_source_window_as_is (TUI_SRC_WIN, gdbarch, s, line, noerror); 324 } 325 326 327 /* Answer whether the source is currently displayed in the source 328 window. */ 329 int 330 tui_source_is_displayed (char *fname) 331 { 332 return (TUI_SRC_WIN->generic.content_in_use 333 && (strcmp (((struct tui_win_element *) (tui_locator_win_info_ptr ())-> 334 content[0])->which_element.locator.file_name, fname) == 0)); 335 } 336 337 338 /* Scroll the source forward or backward vertically. */ 339 void 340 tui_vertical_source_scroll (enum tui_scroll_direction scroll_direction, 341 int num_to_scroll) 342 { 343 if (TUI_SRC_WIN->generic.content != NULL) 344 { 345 struct tui_line_or_address l; 346 struct symtab *s; 347 tui_win_content content = (tui_win_content) TUI_SRC_WIN->generic.content; 348 struct symtab_and_line cursal = get_current_source_symtab_and_line (); 349 350 if (cursal.symtab == (struct symtab *) NULL) 351 s = find_pc_symtab (get_frame_pc (get_selected_frame (NULL))); 352 else 353 s = cursal.symtab; 354 355 l.loa = LOA_LINE; 356 if (scroll_direction == FORWARD_SCROLL) 357 { 358 l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no 359 + num_to_scroll; 360 if (l.u.line_no > s->nlines) 361 /* line = s->nlines - win_info->generic.content_size + 1; */ 362 /* elz: fix for dts 23398. */ 363 l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no; 364 } 365 else 366 { 367 l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no 368 - num_to_scroll; 369 if (l.u.line_no <= 0) 370 l.u.line_no = 1; 371 } 372 373 print_source_lines (s, l.u.line_no, l.u.line_no + 1, 0); 374 } 375 } 376