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3b336828de
If the first requested line is larger than the number of lines in the source buffer, source_cache::extract_lines could crash, because it would try to pass string::npos" to string::substr. This patch avoids the crash by checking for this case. This version of the patch changes get_source_lines to return std::string. gdb/ChangeLog 2019-03-14 Tom Tromey <tromey@adacore.com> * source-cache.h (class source_cache) <get_source_lines>: Return std::string. * source-cache.c (source_cache::extract_lines): Handle case where first_pos==npos. Return std::string. (source_cache::get_source_lines): Update.
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
/* Cache of styled source file text
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Copyright (C) 2018-2019 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef SOURCE_CACHE_H
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#define SOURCE_CACHE_H
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/* This caches highlighted source text, keyed by the source file's
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full name. A size-limited LRU cache is used.
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Highlighting depends on the GNU Source Highlight library. When not
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available, this cache will fall back on reading plain text from the
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appropriate file. */
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class source_cache
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{
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public:
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source_cache ()
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{
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}
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/* Get the source text for the source file in symtab S. FIRST_LINE
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and LAST_LINE are the first and last lines to return; line
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numbers are 1-based. If the file cannot be read, false is
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returned. Otherwise, LINES_OUT is set to the desired text. The
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returned text may include ANSI terminal escapes. */
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bool get_source_lines (struct symtab *s, int first_line,
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int last_line, std::string *lines_out);
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/* Remove all the items from the source cache. */
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void clear ()
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{
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m_source_map.clear ();
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}
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private:
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/* One element in the cache. */
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struct source_text
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{
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/* The full name of the file. */
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std::string fullname;
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/* The contents of the file. */
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std::string contents;
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};
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/* A helper function for get_source_lines that is used when the
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source lines are not highlighted. The arguments and return value
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are as for get_source_lines. */
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bool get_plain_source_lines (struct symtab *s, int first_line,
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int last_line, std::string *lines_out);
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/* A helper function for get_plain_source_lines that extracts the
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desired source lines from TEXT, putting them into LINES_OUT. The
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arguments are as for get_source_lines. The return value is the
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desired lines. */
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std::string extract_lines (const struct source_text &text, int first_line,
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int last_line);
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/* The contents of the cache. */
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std::vector<source_text> m_source_map;
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};
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/* The global source cache. */
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extern source_cache g_source_cache;
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#endif /* SOURCE_CACHE_H */
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