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/* -*- Mode: C -*- */
/* custom.c --- printf clone for argv arrays
* Copyright (C) 2003 Gary V. Vaughan
* Originally by Paolo Bonzini, 2002
* This file is part of Snprintfv
*
* Snprintfv 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 of the
* License, or (at your option) any later version.
*
* Snprintfv 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* As a special exception to the GNU General Public License, if you
* distribute this file as part of a program that also links with and
* uses the libopts library from AutoGen, you may include it under
* the same distribution terms used by the libopts library.
*/
/* Code: */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifdef WITH_DMALLOC
# include <dmalloc.h>
#endif
#include <stddef.h>
#if HAVE_RUNETYPE_H
# include <runetype.h>
#endif
#ifdef HAVE_WCHAR_H
# include <wchar.h>
#endif
#include "printf.h"
/**
* printf_generic_info:
* @pinfo: the current state information for the format
* string parser.
* @n: the number of available slots in the @argtypes array
* @argtypes: the pointer to the first slot to be filled by the
* function
*
* An example implementation of a %printf_arginfo_function, which
* takes the basic type from the type given in the %spec_entry
* and adds flags depending on what was parsed (e.g. %PA_FLAG_SHORT
* is %pparser->is_short and so on).
*
* Return value:
* Always 1.
*/
int
printf_generic_info (struct printf_info *const pinfo, size_t n, int *argtypes)
{
int type = pinfo->type;
if (!n)
return 1;
if ((type & PA_TYPE_MASK) == PA_POINTER)
type |= PA_FLAG_UNSIGNED;
if (pinfo->is_char)
type = PA_CHAR;
if (pinfo->is_short)
type |= PA_FLAG_SHORT;
if (pinfo->is_long)
type |= PA_FLAG_LONG;
if (pinfo->is_long_double)
type |= PA_FLAG_LONG_LONG;
argtypes[0] = type;
return 1;
}
/**
* printf_generic:
* @stream: the stream (possibly a struct printfv_stream appropriately
* cast) on which to write output.
* @pinfo: the current state information for the format string parser.
* @args: the pointer to the first argument to be read by the handler
*
* An example implementation of a %printf_function, used to provide easy
* access to justification, width and precision options.
*
* Return value:
* The number of characters output.
**/
int
printf_generic (STREAM *stream, struct printf_info *const pinfo, union printf_arg const *args)
{
int len = 0, count_or_errorcode = SNV_OK;
char *p = NULL;
/* Used to interface to the custom function. */
STREAM *out;
Filament *fil;
printf_function *user_func = (printf_function *) pinfo->extra;
return_val_if_fail (pinfo != NULL, SNV_ERROR);
/* Read these now to advance the argument pointer appropriately */
if (pinfo->prec == -1)
pinfo->prec = 0;
/* Check for valid pre-state. */
if (pinfo->prec <= -1)
{
PRINTF_ERROR (pinfo, "invalid flags");
return -1;
}
/* Print to a stream using a user-supplied function. */
fil = filnew (NULL, (size_t)0);
out = stream_new (fil, SNV_UNLIMITED, NULL, snv_filputc);
user_func (out, pinfo, args);
stream_delete (out);
len = fillen (fil);
p = fildelete (fil);
/* Left pad to the width if the supplied argument is less than
the width specifier. */
if (p != NULL && pinfo->prec && pinfo->prec < len)
len = pinfo->prec;
if ((len < pinfo->width) && !pinfo->left)
{
int padwidth = pinfo->width - len;
while ((count_or_errorcode >= 0) && (count_or_errorcode < padwidth))
SNV_EMIT (pinfo->pad, stream, count_or_errorcode);
}
/* Fill the buffer with as many characters from the format argument
* as possible without overflowing or exceeding the precision.
*/
if ((count_or_errorcode >= 0) && (p != NULL))
{
int mark = count_or_errorcode;
while ((count_or_errorcode >= 0) && *p != '\0'
&& ((pinfo->prec == 0) || (count_or_errorcode - mark < len)))
SNV_EMIT (*p++, stream, count_or_errorcode);
}
/* Right pad to the width if we still didn't reach the specified
* width and the left justify flag was set.
*/
if ((count_or_errorcode < pinfo->width) && pinfo->left)
while ((count_or_errorcode >= 0)
&& (count_or_errorcode < pinfo->width))
SNV_EMIT (pinfo->pad, stream, count_or_errorcode);
/* Return the number of characters emitted. */
return count_or_errorcode;
}
/*
* Local Variables:
* mode: C
* c-file-style: "gnu"
* indent-tabs-mode: nil
* End:
* end of snprintfv/custom.c */
|
