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/* Ps stream output
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
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 2, 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; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include "ps.h"
#include "common.h"
/* ---------------------------------------------------------------- */
/* Write at most MAX_LEN characters of STRING to STREAM (if MAX_LEN > the
length of STRING, then write all of it; if MAX_LEN == -1, then write all
of STRING regardless). */
error_t
ps_stream_write (ps_stream_t stream, char *string, ssize_t max_len)
{
size_t len = strlen(string);
if (max_len >= 0 && len > max_len)
len = max_len;
if (len > 0)
{
size_t output;
ssize_t spaces_needed = stream->spaces;
stream->spaces = 0;
while (spaces_needed > 0)
{
static char spaces[] = " ";
#define spaces_len (sizeof(spaces) - 1)
size_t chunk = spaces_needed > spaces_len ? spaces_len : spaces_needed;
error_t err =
ps_stream_write (stream, spaces + spaces_len - chunk, chunk);
if (err)
return err;
spaces_needed -= chunk;
}
stream->spaces = spaces_needed;
output = fwrite (string, 1, len, stream->stream);
if (output == 0)
return errno;
stream->pos += len;
}
return 0;
}
/* Write NUM spaces to STREAM. NUM may be negative, in which case the same
number of adjacent spaces (written by other calls to ps_stream_space) are
consumed if possible. If an error occurs, the error code is returned,
otherwise 0. */
error_t
ps_stream_space (ps_stream_t stream, ssize_t num)
{
stream->spaces += num;
return 0;
}
/* Write as many spaces to STREAM as required to make a field of width SOFAR
be at least WIDTH characters wide (the absolute value of WIDTH is used).
If an error occurs, the error code is returned, otherwise 0. */
error_t
ps_stream_pad (ps_stream_t stream, ssize_t sofar, ssize_t width)
{
return ps_stream_space (stream, ABS (width) - sofar);
}
/* Write a newline to STREAM, resetting its position to zero. */
error_t
ps_stream_newline (ps_stream_t stream)
{
putc ('\n', stream->stream);
stream->spaces = 0;
stream->pos = 0;
return 0;
}
/* Write the string BUF to STREAM, padded on one side with spaces to be at
least the absolute value of WIDTH long: if WIDTH >= 0, then on the left
side, otherwise on the right side. If an error occurs, the error code is
returned, otherwise 0. */
error_t
_ps_stream_write_field (ps_stream_t stream, char *buf, size_t max_width,
int width)
{
size_t len;
error_t err;
while (isspace (*buf))
buf++;
len = strlen (buf);
while (isspace (buf[len - 1]))
len--;
if (max_width >= 0 && len > max_width)
len = max_width;
if (width > 0)
{
err = ps_stream_write (stream, buf, len);
if (!err)
err = ps_stream_space (stream, width - len);
}
else if (width < 0)
{
err = ps_stream_space (stream, -width - len);
if (!err)
err = ps_stream_write (stream, buf, len);
}
else
err = ps_stream_write (stream, buf, len);
return err;
}
/* Write the string BUF to STREAM, padded on one side with spaces to be at
least the absolute value of WIDTH long: if WIDTH >= 0, then on the left
side, otherwise on the right side. If an error occurs, the error code is
returned, otherwise 0. */
error_t
ps_stream_write_field (ps_stream_t stream, char *buf, int width)
{
return _ps_stream_write_field (stream, buf, -1, width);
}
/* Like ps_stream_write_field, but truncates BUF to make it fit into WIDTH. */
error_t
ps_stream_write_trunc_field (ps_stream_t stream, char *buf, int width)
{
return _ps_stream_write_field (stream, buf, width ? ABS (width) : -1, width);
}
/* Write the decimal representation of VALUE to STREAM, padded on one side
with spaces to be at least the absolute value of WIDTH long: if WIDTH >=
0, then on the left side, otherwise on the right side. If an error
occurs, the error code is returned, otherwise 0. */
error_t
ps_stream_write_int_field (ps_stream_t stream, int value, int width)
{
char buf[20];
sprintf(buf, "%d", value);
return ps_stream_write_field (stream, buf, width);
}
/* Create a stream outputing to DEST, and return it in STREAM, or an error. */
error_t
ps_stream_create (FILE *dest, ps_stream_t *stream)
{
*stream = malloc (sizeof (struct ps_stream));
if (! *stream)
return ENOMEM;
(*stream)->stream = dest;
(*stream)->spaces = 0;
(*stream)->pos = 0;
return 0;
}
/* Frees STREAM. The destination file is *not* closed. */
void
ps_stream_free (ps_stream_t stream)
{
free (stream);
}
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