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/*
* buffer.c - read line by line with conversion of EOL types
*
* Copyright (c) 1988-1993 Miguel Santana
* Copyright (c) 1995-1999 Akim Demaille, Miguel Santana
*/
/*
* This file is part of a2ps.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* $Id: buffer.c,v 1.1.1.1.2.1 2007/12/29 01:58:34 mhatta Exp $
*/
/* FIXME: There is a case where the behavior is probably wrong: mixed
string/stream buffers. It may happen that the last char of the
string part be a '\n' (or '\r') and buffer wants to see the next
char (to see if is a '\r' (or '\n')), but the next char is in the
stream, not the string.
Currently it does not fetch that next char. */
#include "a2ps.h"
#include "routines.h"
#include "argmatch.h"
#include "buffer.h"
#include <assert.h>
/****************************************************************/
/* Handling of the various eol styles */
/****************************************************************/
const char *
eol_to_string (enum eol_e eol)
{
switch (eol)
{
case eol_r:
return "\\r";
case eol_n:
return "\\n";
case eol_rn:
return "\\r\\n";
case eol_nr:
return "\\n\\r";
case eol_auto:
/* TRANS: the type of the end-of-line rules, is `any type', i.e.
lines ended by \n, or \r, or \r\n, or \n\r are OK */
return _ ("any type");
default:
abort ();
}
return NULL; /* -Wall */
}
/*
* What about the bools
*/
static const char *const eol_args[] =
{
"r", "mac",
"n", "unix",
"nr",
"rn", "pc",
"auto", "any", "4x4",
0
};
static const enum eol_e eol_types[] =
{
eol_r, eol_r,
eol_n, eol_n,
eol_nr,
eol_rn, eol_rn,
eol_auto, eol_auto, eol_auto
};
enum eol_e
option_string_to_eol (const char *option,
const char *arg)
{
ARGMATCH_ASSERT (eol_args, eol_types);
return XARGCASEMATCH (option, arg, eol_args, eol_types);
}
/****************************************************************/
/* buffer_t Service routines */
/****************************************************************/
static inline void
buffer_internal_set (buffer_t * buffer,
FILE * stream,
const uchar * buf, size_t bufsize,
bool pipe_p, enum eol_e eol)
{
buffer->buf = buf;
buffer->bufsize = bufsize;
buffer->bufoffset = 0;
buffer->stream = stream;
buffer->pipe_p = pipe_p;
buffer->content = NULL;
buffer->eol = eol;
buffer->lower_case = false; /* By default, no lower case version. */
buffer->value = NULL;
buffer->line = 0;
buffer->allocsize = 0;
buffer->len = 0;
buffer->curr = 0;
obstack_init (&buffer->obstack);
}
void
buffer_stream_set (buffer_t * buffer, FILE * stream, enum eol_e eol)
{
buffer_internal_set (buffer, stream, NULL, 0, false, eol);
}
void
buffer_pipe_set (buffer_t * buffer, FILE * stream, enum eol_e eol)
{
buffer_internal_set (buffer, stream, NULL, 0, true, eol);
}
void
buffer_string_set (buffer_t * buffer, const uchar * string, enum eol_e eol)
{
buffer_internal_set (buffer, NULL, string, strlen (string), false, eol);
}
void
buffer_buffer_set (buffer_t * buffer, const uchar * buf, size_t bufsize,
enum eol_e eol)
{
buffer_internal_set (buffer, NULL, buf, bufsize, false, eol);
}
/* getc and ungetc on the stream of Buf. */
#define sgetc(Buf) (getc ((Buf)->stream))
#define sungetc(Char, Buf) (ungetc (Char, (Buf)->stream))
/* getc and ungetc on the buffer of Buf.
It is much more tricky, especially if Buf is mixed buffer/stream.
Even when the buffer was completely read, the oofset must be increased. */
#define bgetc(Buf) \
(((Buf)->bufoffset < (Buf)->bufsize) \
? ((Buf)->buf[(Buf)->bufoffset++]) \
: ((Buf)->bufoffset++, EOF))
#define bungetc(Char, Buf) ((Buf)->bufoffset--)
void
buffer_self_print (buffer_t * buffer, FILE * stream)
{
if (buffer->buf)
fprintf (stream, "A string buffer. Bufoffset %u\n",
buffer->bufoffset);
if (buffer->stream)
fprintf (stream, "A stream buffer (%s).\n",
buffer->pipe_p ? "pipe" : "file");
fprintf (stream, "Len = %d, Lower case = %d, Line = %d\n",
buffer->len, buffer->lower_case, buffer->line);
if (buffer->len)
fprintf (stream, "Content = `%s'\n", buffer->content);
}
/*
* It frees the content, not the pointer
*/
void
buffer_release (buffer_t * buffer)
{
/* VALUE is malloc'd only if BUFFER->LOWER_CASE */
if (buffer->lower_case)
free (buffer->value);
/* I don't know how this one should be used */
/* obstack_free (&buffer->obstack, NULL); */
}
void
buffer_set_lower_case (buffer_t * buffer, bool sensitive)
{
buffer->lower_case = sensitive;
}
/*
* Get a line from BUFFER->STREAM.
* Returns true if a full line has been read,
* false if EOF was met before
*/
static inline bool
buffer_stream_get_line (buffer_t * buffer)
{
register int c, d;
while ((c = sgetc (buffer)) != EOF)
switch (c)
{
case '\n':
switch (buffer->eol)
{
case eol_r:
case eol_rn:
/* \n plain char */
goto stream_plain_char;
case eol_auto:
/* If the next char is a \r, eat it */
if ((d = sgetc (buffer)) != '\r')
sungetc (d, buffer);
break;
case eol_n:
/* This is a good eol */
break;
case eol_nr:
if ((d = sgetc (buffer)) != '\r')
{
/* This is \n, but eol is \n\r: make it a plain char */
sungetc (d, buffer);
goto stream_plain_char;
}
/* This is eol=\n\r, just return \n */
break;
}
/* End it. No need to NUL-terminate */
obstack_1grow (&buffer->obstack, c);
return true;
case '\r':
switch (buffer->eol)
{
case eol_n:
case eol_nr:
/* \r plain char */
goto stream_plain_char;
case eol_r:
/* This is a good eol, but the lib uses \n */
c = '\n';
break;
case eol_auto:
/* If the next char is a \n, eat it */
if ((d = sgetc (buffer)) != '\n')
sungetc (d, buffer);
c = '\n';
break;
case eol_rn:
if ((d = sgetc (buffer)) != '\n')
{
/* This is \r, but eol is \r\n: make it a plain char */
sungetc (d, buffer);
goto stream_plain_char;
}
/* This is eol = \r\n: just return \n */
c = '\n';
break;
}
/* End it. No need to NUL-terminate */
obstack_1grow (&buffer->obstack, c);
return true;
default:
stream_plain_char:
obstack_1grow (&buffer->obstack, c);
break;
}
/* If we are here, it's because there is nothing more to read, and
the last char was not an eol: report the line is not complete. */
return false;
}
/*
* Get a line from BUFFER->BUF
*
* Note that we could have made it destuctive.
* But would have caused problem if some day we want to use
* mmap.
*
* Returns true if a full line has been read,
* false if EOF (i.e. offset >= bufsize) was met before
*/
static inline bool
buffer_string_get_line (buffer_t * buffer)
{
register int c, d;
while ((c = bgetc (buffer)) != EOF)
switch (c)
{
case '\n':
switch (buffer->eol)
{
case eol_r:
case eol_rn:
/* \n plain char */
goto string_plain_char;
case eol_auto:
/* If the next char is a \r, eat it */
if ((d = bgetc (buffer)) != '\r')
bungetc (d, buffer);
break;
case eol_n:
/* This is a good eol */
break;
case eol_nr:
if ((d = bgetc (buffer)) != '\r')
{
/* This is \n, but eol is \n\r: make it a plain char */
bungetc (d, buffer);
goto string_plain_char;
}
/* This is eol=\n\r, just return \n */
break;
}
/* End it. No need to NUL-terminate */
obstack_1grow (&buffer->obstack, c);
return true;
case '\r':
switch (buffer->eol)
{
case eol_n:
case eol_nr:
/* \r plain char */
goto string_plain_char;
case eol_r:
/* This is a good eol, but the lib uses \n */
c = '\n';
break;
case eol_auto:
/* If the next char is a \n, eat it */
if ((d = bgetc (buffer)) != '\n')
bungetc (d, buffer);
c = '\n';
break;
case eol_rn:
if ((d = bgetc (buffer)) != '\n')
{
/* This is \r, but eol is \r\n: make it a plain char */
bungetc (d, buffer);
goto string_plain_char;
}
/* This is eol = \r\n: just return \n */
c = '\n';
break;
}
/* End it. No need to NUL-terminate */
obstack_1grow (&buffer->obstack, c);
return true;
default:
string_plain_char:
obstack_1grow (&buffer->obstack, c);
break;
}
/* If we are here, it's because there is nothing more to read, and
the last char was not an eol: report the line is not complete. */
return false;
}
/* buffer_get
* if the language is case insensitive,
* build a lower case version of the buffer
*/
void
buffer_get (buffer_t * buffer)
{
bool line_ended_p = false; /* the line read finishes by eol */
/* If there is something to read from the buffered string, fetch it */
if (buffer->buf && buffer->bufoffset < buffer->bufsize)
line_ended_p = buffer_string_get_line (buffer);
/* If the line was not finished, continue the reading but in the
stream. This includes the case where there is no buf */
if (buffer->stream && !line_ended_p)
line_ended_p = buffer_stream_get_line (buffer);
/* A full line has been read. Close the obstack, get the content.
We NUL terminate because it helps the parsing functions such as
match_keyword, which looks one char after the current char. With
this sentinel, which is probably not in the alphabet, we save a
test on the length of the buffer. */
buffer->len = obstack_object_size (&buffer->obstack);
obstack_1grow (&buffer->obstack, '\0');
buffer->content = (uchar *) obstack_finish (&buffer->obstack);
/* One more line read */
buffer->line++;
/* If the eol char is preceded by a \f, then just forget the eol, so
that there won't be a blank line at the top of the next page */
if ((buffer->len >= 2)
&& buffer->content[buffer->len - 2] == '\f')
{
buffer->content[--(buffer->len)] = '\0';
}
if (buffer->lower_case)
{
size_t i;
if (buffer->allocsize <= buffer->len)
buffer->allocsize = buffer->len + 1;
buffer->value =
XREALLOC (buffer->value, uchar, buffer->allocsize);
for (i = 0; i <= buffer->len; i++)
buffer->value[i] = tolower (buffer->content[i]);
}
else
{
buffer->value = buffer->content;
}
buffer->curr = 0;
}
/* buffer_sample_get
* extract a piece of a BUFFER's stream into FILENAME
*
* The piece that has been extracted is taken as buf in BUFFER, so that
* we still can use it.
*/
void
buffer_sample_get (buffer_t * buffer, const char *filename)
{
/* I think that most file(1) just use the 512 first bytes */
#define SAMPLE_SIZE 512
FILE *out = xwfopen (filename);
size_t cur = 0;
int c;
char *sample_buffer = XMALLOC (char, SAMPLE_SIZE);
for (; (cur < SAMPLE_SIZE) && ((c = sgetc (buffer)) != EOF); cur++)
{
sample_buffer[cur] = c;
putc (c, out);
}
/* Put the sample into the buffer for later use */
buffer->buf = sample_buffer;
buffer->bufsize = cur;
fclose (out);
}
/* buffer_save
* save the content of BUFFER to the file FILENAME
* if BUFFER has a buf, dump it
* then if it has a stream, dump its content
*
* Note that the buffer is no longer usable: we don't rewind it,
* because it can be stdin.
*/
void
buffer_save (buffer_t * buffer, const char *filename)
{
FILE *out = xwfopen (filename);
if (buffer->buf)
{
size_t cur;
for (cur = 0; cur < buffer->bufsize; cur++)
putc (buffer->buf[cur], out);
}
if (buffer->stream)
streams_copy (buffer->stream, out);
fclose (out);
}
/*
* Check if sample + dump are OK. Only for debug purpose
*/
#if BUFFER_TEST
void
buffer_test (const char *filename)
{
FILE *in = xrfopen (filename);
buffer_t buffer;
buffer_stream_set (&buffer, in, eol_n);
buffer_sample_get (&buffer, "/tmp/sample");
buffer_save (&buffer, "/tmp/dump");
buffer_release (&buffer);
}
#endif
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