1/* TUI display source window. 2 3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007 4 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 31#include "tui/tui.h" 32#include "tui/tui-data.h" 33#include "tui/tui-stack.h" 34#include "tui/tui-winsource.h" 35#include "tui/tui-source.h" 36 37#include "gdb_string.h" 38#include "gdb_curses.h" 39 40/* Function to display source in the source window. */ 41enum tui_status 42tui_set_source_content (struct symtab *s, 43 int line_no, 44 int noerror) 45{ 46 enum tui_status ret = TUI_FAILURE; 47 48 if (s != (struct symtab *) NULL && s->filename != (char *) NULL) 49 { 50 FILE *stream; 51 int i, desc, c, line_width, nlines; 52 char *src_line = 0; 53 54 if ((ret = tui_alloc_source_buffer (TUI_SRC_WIN)) == TUI_SUCCESS) 55 { 56 line_width = TUI_SRC_WIN->generic.width - 1; 57 /* Take hilite (window border) into account, when 58 calculating the number of lines. */ 59 nlines = (line_no + (TUI_SRC_WIN->generic.height - 2)) - line_no; 60 desc = open_source_file (s); 61 if (desc < 0) 62 { 63 if (!noerror) 64 { 65 char *name = alloca (strlen (s->filename) + 100); 66 sprintf (name, "%s:%d", s->filename, line_no); 67 print_sys_errmsg (name, errno); 68 } 69 ret = TUI_FAILURE; 70 } 71 else 72 { 73 if (s->line_charpos == 0) 74 find_source_lines (s, desc); 75 76 if (line_no < 1 || line_no > s->nlines) 77 { 78 close (desc); 79 printf_unfiltered ( 80 "Line number %d out of range; %s has %d lines.\n", 81 line_no, s->filename, s->nlines); 82 } 83 else if (lseek (desc, s->line_charpos[line_no - 1], 0) < 0) 84 { 85 close (desc); 86 perror_with_name (s->filename); 87 } 88 else 89 { 90 int offset, cur_line_no, cur_line, cur_len, threshold; 91 struct tui_gen_win_info *locator = tui_locator_win_info_ptr (); 92 struct tui_source_info *src = &TUI_SRC_WIN->detail.source_info; 93 94 if (TUI_SRC_WIN->generic.title) 95 xfree (TUI_SRC_WIN->generic.title); 96 TUI_SRC_WIN->generic.title = xstrdup (s->filename); 97 98 if (src->filename) 99 xfree (src->filename); 100 src->filename = xstrdup (s->filename); 101 102 /* Determine the threshold for the length of the 103 line and the offset to start the display. */ 104 offset = src->horizontal_offset; 105 threshold = (line_width - 1) + offset; 106 stream = fdopen (desc, FOPEN_RT); 107 clearerr (stream); 108 cur_line = 0; 109 src->start_line_or_addr.loa = LOA_LINE; 110 cur_line_no = src->start_line_or_addr.u.line_no = line_no; 111 if (offset > 0) 112 src_line = (char *) xmalloc ( 113 (threshold + 1) * sizeof (char)); 114 while (cur_line < nlines) 115 { 116 struct tui_win_element *element = (struct tui_win_element *) 117 TUI_SRC_WIN->generic.content[cur_line]; 118 119 /* Get the first character in the line. */ 120 c = fgetc (stream); 121 122 if (offset == 0) 123 src_line = ((struct tui_win_element *) 124 TUI_SRC_WIN->generic.content[ 125 cur_line])->which_element.source.line; 126 /* Init the line with the line number. */ 127 sprintf (src_line, "%-6d", cur_line_no); 128 cur_len = strlen (src_line); 129 i = cur_len - 130 ((cur_len / tui_default_tab_len ()) * tui_default_tab_len ()); 131 while (i < tui_default_tab_len ()) 132 { 133 src_line[cur_len] = ' '; 134 i++; 135 cur_len++; 136 } 137 src_line[cur_len] = (char) 0; 138 139 /* Set whether element is the execution point 140 and whether there is a break point on it. */ 141 element->which_element.source.line_or_addr.loa = 142 LOA_LINE; 143 element->which_element.source.line_or_addr.u.line_no = 144 cur_line_no; 145 element->which_element.source.is_exec_point = 146 (strcmp (((struct tui_win_element *) 147 locator->content[0])->which_element.locator.file_name, 148 s->filename) == 0 149 && cur_line_no == ((struct tui_win_element *) 150 locator->content[0])->which_element.locator.line_no); 151 if (c != EOF) 152 { 153 i = strlen (src_line) - 1; 154 do 155 { 156 if ((c != '\n') && (c != '\r') 157 && (++i < threshold)) 158 { 159 if (c < 040 && c != '\t') 160 { 161 src_line[i++] = '^'; 162 src_line[i] = c + 0100; 163 } 164 else if (c == 0177) 165 { 166 src_line[i++] = '^'; 167 src_line[i] = '?'; 168 } 169 else 170 { /* Store the charcter in the 171 line buffer. If it is a tab, 172 then translate to the correct 173 number of chars so we don't 174 overwrite our buffer. */ 175 if (c == '\t') 176 { 177 int j, max_tab_len = tui_default_tab_len (); 178 179 for (j = i - ((i / max_tab_len) * max_tab_len); 180 j < max_tab_len 181 && i < threshold; 182 i++, j++) 183 src_line[i] = ' '; 184 i--; 185 } 186 else 187 src_line[i] = c; 188 } 189 src_line[i + 1] = 0; 190 } 191 else 192 { /* If we have not reached EOL, then 193 eat chars until we do. */ 194 while (c != EOF && c != '\n' && c != '\r') 195 c = fgetc (stream); 196 /* Handle non-'\n' end-of-line. */ 197 if (c == '\r' 198 && (c = fgetc (stream)) != '\n' 199 && c != EOF) 200 { 201 ungetc (c, stream); 202 c = '\r'; 203 } 204 205 } 206 } 207 while (c != EOF && c != '\n' && c != '\r' 208 && i < threshold 209 && (c = fgetc (stream))); 210 } 211 /* Now copy the line taking the offset into 212 account. */ 213 if (strlen (src_line) > offset) 214 strcpy (((struct tui_win_element *) TUI_SRC_WIN->generic.content[ 215 cur_line])->which_element.source.line, 216 &src_line[offset]); 217 else 218 ((struct tui_win_element *) 219 TUI_SRC_WIN->generic.content[ 220 cur_line])->which_element.source.line[0] = (char) 0; 221 cur_line++; 222 cur_line_no++; 223 } 224 if (offset > 0) 225 xfree (src_line); 226 fclose (stream); 227 TUI_SRC_WIN->generic.content_size = nlines; 228 ret = TUI_SUCCESS; 229 } 230 } 231 } 232 } 233 return ret; 234} 235 236 237/* elz: This function sets the contents of the source window to empty 238 except for a line in the middle with a warning message about the 239 source not being available. This function is called by 240 tui_erase_source_contents(), which in turn is invoked when the 241 source files cannot be accessed. */ 242 243void 244tui_set_source_content_nil (struct tui_win_info *win_info, 245 char *warning_string) 246{ 247 int line_width; 248 int n_lines; 249 int curr_line = 0; 250 251 line_width = win_info->generic.width - 1; 252 n_lines = win_info->generic.height - 2; 253 254 /* Set to empty each line in the window, except for the one which 255 contains the message. */ 256 while (curr_line < win_info->generic.content_size) 257 { 258 /* Set the information related to each displayed line to null: 259 i.e. the line number is 0, there is no bp, it is not where 260 the program is stopped. */ 261 262 struct tui_win_element *element = 263 (struct tui_win_element *) win_info->generic.content[curr_line]; 264 element->which_element.source.line_or_addr.loa = LOA_LINE; 265 element->which_element.source.line_or_addr.u.line_no = 0; 266 element->which_element.source.is_exec_point = FALSE; 267 element->which_element.source.has_break = FALSE; 268 269 /* Set the contents of the line to blank. */ 270 element->which_element.source.line[0] = (char) 0; 271 272 /* If the current line is in the middle of the screen, then we 273 want to display the 'no source available' message in it. 274 Note: the 'weird' arithmetic with the line width and height 275 comes from the function tui_erase_source_content(). We need 276 to keep the screen and the window's actual contents in 277 synch. */ 278 279 if (curr_line == (n_lines / 2 + 1)) 280 { 281 int i; 282 int xpos; 283 int warning_length = strlen (warning_string); 284 char *src_line; 285 286 src_line = element->which_element.source.line; 287 288 if (warning_length >= ((line_width - 1) / 2)) 289 xpos = 1; 290 else 291 xpos = (line_width - 1) / 2 - warning_length; 292 293 for (i = 0; i < xpos; i++) 294 src_line[i] = ' '; 295 296 sprintf (src_line + i, "%s", warning_string); 297 298 for (i = xpos + warning_length; i < line_width; i++) 299 src_line[i] = ' '; 300 301 src_line[i] = '\n'; 302 303 } /* end if */ 304 305 curr_line++; 306 307 } /* end while */ 308} 309 310 311/* Function to display source in the source window. This function 312 initializes the horizontal scroll to 0. */ 313void 314tui_show_symtab_source (struct symtab *s, 315 struct tui_line_or_address line, 316 int noerror) 317{ 318 TUI_SRC_WIN->detail.source_info.horizontal_offset = 0; 319 tui_update_source_window_as_is (TUI_SRC_WIN, s, line, noerror); 320} 321 322 323/* Answer whether the source is currently displayed in the source 324 window. */ 325int 326tui_source_is_displayed (char *fname) 327{ 328 return (TUI_SRC_WIN->generic.content_in_use 329 && (strcmp (((struct tui_win_element *) (tui_locator_win_info_ptr ())-> 330 content[0])->which_element.locator.file_name, fname) == 0)); 331} 332 333 334/* Scroll the source forward or backward vertically. */ 335void 336tui_vertical_source_scroll (enum tui_scroll_direction scroll_direction, 337 int num_to_scroll) 338{ 339 if (TUI_SRC_WIN->generic.content != NULL) 340 { 341 struct tui_line_or_address l; 342 struct symtab *s; 343 tui_win_content content = (tui_win_content) TUI_SRC_WIN->generic.content; 344 struct symtab_and_line cursal = get_current_source_symtab_and_line (); 345 346 if (cursal.symtab == (struct symtab *) NULL) 347 s = find_pc_symtab (get_frame_pc (get_selected_frame (NULL))); 348 else 349 s = cursal.symtab; 350 351 l.loa = LOA_LINE; 352 if (scroll_direction == FORWARD_SCROLL) 353 { 354 l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no 355 + num_to_scroll; 356 if (l.u.line_no > s->nlines) 357 /* line = s->nlines - win_info->generic.content_size + 1; */ 358 /* elz: fix for dts 23398. */ 359 l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no; 360 } 361 else 362 { 363 l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no 364 - num_to_scroll; 365 if (l.u.line_no <= 0) 366 l.u.line_no = 1; 367 } 368 369 print_source_lines (s, l.u.line_no, l.u.line_no + 1, 0); 370 } 371} 372