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Change wrap buffering to use a std::string 

Currently wrap buffering is implemented by allocating a string that is
the same width as the window, and then writing characters into it.
However, if gdb emits terminal escapes, then these could possibly
overflow the buffer.

To prevent this, change the wrap buffer to be a std::string and update
the various uses.

This also changes utils.c to always emit characters to the wrap
buffer.  This simplifies future patches which emit terminal escape
sequences, and also makes it possible for the "echo" and "printf"
commands to be used to emit terminal escapes and have these work in
the TUI.

gdb/ChangeLog
2018-12-28  Tom Tromey  <tom@tromey.com>

	* utils.c (filter_initialized): New global.
	(wrap_buffer): Now a std::string.
	(wrap_pointer): Remove.
	(flush_wrap_buffer): New function.
	(filtered_printing_initialized, set_width, wrap_here)
	(fputs_maybe_filtered): Update.
This commit is contained in:
Tom Tromey 2018-09-05 11:25:28 -06:00
parent 94f2c73066
commit c5603d5063
2 changed files with 35 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
gdb/ChangeLog
View File

@ -1,3 +1,12 @@
2018-12-28 Tom Tromey <tom@tromey.com>
* utils.c (filter_initialized): New global.
(wrap_buffer): Now a std::string.
(wrap_pointer): Remove.
(flush_wrap_buffer): New function.
(filtered_printing_initialized, set_width, wrap_here)
(fputs_maybe_filtered): Update.
2018-12-28 Eli Zaretskii <eliz@gnu.org>
* coffread.c (coff_symtab_read): Don't record in minsyms symbols

63
gdb/utils.c
View File

@ -1268,13 +1268,11 @@ static bool pagination_disabled_for_command;
the end of the line, we spit out a newline, the indent, and then
the buffered output. */
/* Malloc'd buffer with chars_per_line+2 bytes. Contains characters which
are waiting to be output (they have already been counted in chars_printed).
When wrap_buffer[0] is null, the buffer is empty. */
static char *wrap_buffer;
static bool filter_initialized = false;
/* Pointer in wrap_buffer to the next character to fill. */
static char *wrap_pointer;
/* Contains characters which are waiting to be output (they have
already been counted in chars_printed). */
static std::string wrap_buffer;
/* String to indent by if the wrap occurs. Must not be NULL if wrap_column
is non-zero. */
@ -1347,7 +1345,7 @@ init_page_info (void)
int
filtered_printing_initialized (void)
{
return wrap_buffer != NULL;
return filter_initialized;
}
set_batch_flag_and_restore_page_info::set_batch_flag_and_restore_page_info ()
@ -1387,8 +1385,7 @@ set_screen_size (void)
rl_set_screen_size (rows, cols);
}
/* Reinitialize WRAP_BUFFER according to the current value of
CHARS_PER_LINE. */
/* Reinitialize WRAP_BUFFER. */
static void
set_width (void)
@ -1396,14 +1393,8 @@ set_width (void)
if (chars_per_line == 0)
init_page_info ();
if (!wrap_buffer)
{
wrap_buffer = (char *) xmalloc (chars_per_line + 2);
wrap_buffer[0] = '\0';
}
else
wrap_buffer = (char *) xrealloc (wrap_buffer, chars_per_line + 2);
wrap_pointer = wrap_buffer; /* Start it at the beginning. */
wrap_buffer.clear ();
filter_initialized = true;
}
static void
@ -1521,6 +1512,18 @@ reinitialize_more_filter (void)
pagination_disabled_for_command = false;
}
/* Flush the wrap buffer to STREAM, if necessary. */
static void
flush_wrap_buffer (struct ui_file *stream)
{
if (!wrap_buffer.empty ())
{
fputs_unfiltered (wrap_buffer.c_str (), stream);
wrap_buffer.clear ();
}
}
/* Indicate that if the next sequence of characters overflows the line,
a newline should be inserted here rather than when it hits the end.
If INDENT is non-null, it is a string to be printed to indent the
@ -1546,17 +1549,11 @@ void
wrap_here (const char *indent)
{
/* This should have been allocated, but be paranoid anyway. */
if (!wrap_buffer)
if (!filter_initialized)
internal_error (__FILE__, __LINE__,
_("failed internal consistency check"));
if (wrap_buffer[0])
{
*wrap_pointer = '\0';
fputs_unfiltered (wrap_buffer, gdb_stdout);
}
wrap_pointer = wrap_buffer;
wrap_buffer[0] = '\0';
flush_wrap_buffer (gdb_stdout);
if (chars_per_line == UINT_MAX) /* No line overflow checking. */
{
wrap_column = 0;
@ -1669,6 +1666,7 @@ fputs_maybe_filtered (const char *linebuffer, struct ui_file *stream,
|| top_level_interpreter () == NULL
|| top_level_interpreter ()->interp_ui_out ()->is_mi_like_p ())
{
flush_wrap_buffer (stream);
fputs_unfiltered (linebuffer, stream);
return;
}
@ -1692,10 +1690,7 @@ fputs_maybe_filtered (const char *linebuffer, struct ui_file *stream,
/* Print a single line. */
if (*lineptr == '\t')
{
if (wrap_column)
*wrap_pointer++ = '\t';
else
fputc_unfiltered ('\t', stream);
wrap_buffer.push_back ('\t');
/* Shifting right by 3 produces the number of tab stops
we have already passed, and then adding one and
shifting left 3 advances to the next tab stop. */
@ -1704,10 +1699,7 @@ fputs_maybe_filtered (const char *linebuffer, struct ui_file *stream,
}
else
{
if (wrap_column)
*wrap_pointer++ = *lineptr;
else
fputc_unfiltered (*lineptr, stream);
wrap_buffer.push_back (*lineptr);
chars_printed++;
lineptr++;
}
@ -1735,8 +1727,7 @@ fputs_maybe_filtered (const char *linebuffer, struct ui_file *stream,
if (wrap_column)
{
fputs_unfiltered (wrap_indent, stream);
*wrap_pointer = '\0'; /* Null-terminate saved stuff, */
fputs_unfiltered (wrap_buffer, stream); /* and eject it. */
flush_wrap_buffer (stream);
/* FIXME, this strlen is what prevents wrap_indent from
containing tabs. However, if we recurse to print it
and count its chars, we risk trouble if wrap_indent is
@ -1745,8 +1736,6 @@ fputs_maybe_filtered (const char *linebuffer, struct ui_file *stream,
if we are printing a long string. */
chars_printed = strlen (wrap_indent)
+ (save_chars - wrap_column);
wrap_pointer = wrap_buffer; /* Reset buffer */
wrap_buffer[0] = '\0';
wrap_column = 0; /* And disable fancy wrap */
}
}