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PR gas/15295

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* listing.c (rebuffer_line): Rewrite to avoid seeking back to the
	start of the file each time.
This commit is contained in:
Nick Clifton 2013-03-26 14:16:59 +00:00
parent c5d685bf3a
commit 9b97828214
2 changed files with 72 additions and 32 deletions
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4
gas/ChangeLog
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@ -1,5 +1,9 @@
2013-03-26 Nick Clifton <nickc@redhat.com>
PR gas/15295
* listing.c (rebuffer_line): Rewrite to avoid seeking back to the
start of the file each time.
PR gas/15178
* config/tc-sparc.h (ELF_TARGET_FORMAT): Set to elf32-sparc for
FreeBSD targets.

100
gas/listing.c
View File

@ -553,7 +553,8 @@ buffer_line (file_info_type *file, char *line, unsigned int size)
/* This function rewinds the requested file back to the line requested,
reads it in again into the buffer provided and then restores the file
back to its original location. */
back to its original location. Returns the buffer pointer upon success
or an empty string if an error occurs. */
static char *
rebuffer_line (file_info_type * file,
@ -562,13 +563,15 @@ rebuffer_line (file_info_type * file,
unsigned int size)
{
unsigned int count = 0;
unsigned int current_line = 1;
unsigned int current_line;
char * p = buffer;
long pos;
long pos2;
int c;
bfd_boolean found = FALSE;
/* Sanity checks. */
if (file == NULL || buffer == NULL || size == 0 || file->linenum <= linenum)
if (file == NULL || buffer == NULL || size <= 1 || file->linenum <= linenum)
return "";
/* Check the cache and see if we last used this file. */
@ -596,38 +599,71 @@ rebuffer_line (file_info_type * file,
}
/* Remember where we are in the current file. */
pos = ftell (last_open_file);
/* Go back to the beginning. */
fseek (last_open_file, 0, SEEK_SET);
/* Skip lines prior to the one we are interested in. */
while (current_line < linenum)
{
/* fgets only stops on newlines and has a size limit,
so we read one character at a time instead. */
do
{
c = fgetc (last_open_file);
}
while (c != EOF && c != '\n' && c != '\r');
++ current_line;
if (c == '\r' || c == '\n')
{
int next = fgetc (last_open_file);
/* If '\r' is followed by '\n', swallow that. Likewise, if '\n'
is followed by '\r', swallow that as well. */
if ((c == '\r' && next != '\n')
|| (c == '\n' && next != '\r'))
ungetc (next, last_open_file);
}
}
pos2 = pos = ftell (last_open_file);
if (pos < 3)
return "";
current_line = file->linenum;
/* Leave room for the nul at the end of the buffer. */
size -= 1;
buffer[size] = 0;
/* Increment the current line count by one.
This is to allow for the fact that we are searching for the
start of a previous line, but we do this by detecting end-of-line
character(s) not start-of-line characters. */
++ current_line;
while (pos2 > 0 && ! found)
{
char * ptr;
/* Move backwards through the file, looking for earlier lines. */
pos2 = (long) size > pos2 ? 0 : pos2 - size;
fseek (last_open_file, pos2, SEEK_SET);
/* Our caller has kindly provided us with a buffer, so we use it. */
if (fread (buffer, 1, size, last_open_file) != size)
{
as_warn (_("unable to rebuffer file: %s\n"), file->filename);
return "";
}
for (ptr = buffer + size; ptr >= buffer; -- ptr)
{
if (*ptr == '\n')
{
-- current_line;
if (current_line == linenum)
{
/* We have found the start of the line we seek. */
found = TRUE;
/* FIXME: We could skip the read-in-the-line code
below if we know that we already have the whole
line in the buffer. */
/* Advance pos2 to the newline character we have just located. */
pos2 += (ptr - buffer);
/* Skip the newline and, if present, the carriage return. */
if (ptr + 1 == buffer + size)
{
++pos2;
if (fgetc (last_open_file) == '\r')
++ pos2;
}
else
pos2 += (ptr[1] == '\r' ? 2 : 1);
/* Move the file pointer to this location. */
fseek (last_open_file, pos2, SEEK_SET);
break;
}
}
}
}
/* Read in the line. */
c = fgetc (last_open_file);