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asshelp2.c
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asshelp2.c
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/* asshelp2.c - More helper functions for Assuan
* Copyright (C) 2012 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of either
*
* - the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* or
*
* - 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.
*
* or both in parallel, as here.
*
* This file 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, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assuan.h>
#include "util.h"
#include "asshelp.h"
#include "status.h"
/* A variable with a function to be used to return the current assuan
* context for a CTRL variable. This needs to be set using the
* set_assuan_ctx_func function. */
static assuan_context_t (*the_assuan_ctx_func)(ctrl_t ctrl);
/* Set FUNC to be used as a mapping function from CTRL to an assuan
* context. Pass NULL for FUNC to disable the use of the assuan
* context in this module. */
void
set_assuan_context_func (assuan_context_t (*func)(ctrl_t ctrl))
{
the_assuan_ctx_func = func;
}
/* Helper function to print an assuan status line using a printf
format string. */
gpg_error_t
vprint_assuan_status (assuan_context_t ctx,
const char *keyword,
const char *format, va_list arg_ptr)
{
int rc;
char *buf;
rc = gpgrt_vasprintf (&buf, format, arg_ptr);
if (rc < 0)
return gpg_err_make (default_errsource, gpg_err_code_from_syserror ());
rc = assuan_write_status (ctx, keyword, buf);
xfree (buf);
return rc;
}
/* Helper function to print an assuan status line using a printf
format string. */
gpg_error_t
print_assuan_status (assuan_context_t ctx,
const char *keyword,
const char *format, ...)
{
va_list arg_ptr;
gpg_error_t err;
va_start (arg_ptr, format);
err = vprint_assuan_status (ctx, keyword, format, arg_ptr);
va_end (arg_ptr);
return err;
}
/* Helper function to print a list of strings as an assuan status
* line. KEYWORD is the first item on the status line. ARG_PTR is a
* list of strings which are all separated by a space in the output.
* The last argument must be a NULL. Linefeeds and carriage returns
* characters (which are not allowed in an Assuan status line) are
* silently quoted in C-style. */
gpg_error_t
vprint_assuan_status_strings (assuan_context_t ctx,
const char *keyword, va_list arg_ptr)
{
gpg_error_t err = 0;
const char *text;
char buf[950], *p;
size_t n;
p = buf;
n = 0;
while ((text = va_arg (arg_ptr, const char *)) && n < DIM (buf)-3 )
{
if (n)
{
*p++ = ' ';
n++;
}
for ( ; *text && n < DIM (buf)-3; n++, text++)
{
if (*text == '\n')
{
*p++ = '\\';
*p++ = 'n';
n++;
}
else if (*text == '\r')
{
*p++ = '\\';
*p++ = 'r';
n++;
}
else
*p++ = *text;
}
}
*p = 0;
err = assuan_write_status (ctx, keyword, buf);
return err;
}
/* See vprint_assuan_status_strings. */
gpg_error_t
print_assuan_status_strings (assuan_context_t ctx, const char *keyword, ...)
{
va_list arg_ptr;
gpg_error_t err;
va_start (arg_ptr, keyword);
err = vprint_assuan_status_strings (ctx, keyword, arg_ptr);
va_end (arg_ptr);
return err;
}
/* This function is similar to print_assuan_status but takes a CTRL
* arg instead of an assuan context as first argument. */
gpg_error_t
status_printf (ctrl_t ctrl, const char *keyword, const char *format, ...)
{
gpg_error_t err;
va_list arg_ptr;
assuan_context_t ctx;
if (!ctrl || !the_assuan_ctx_func || !(ctx = the_assuan_ctx_func (ctrl)))
return 0;
va_start (arg_ptr, format);
err = vprint_assuan_status (ctx, keyword, format, arg_ptr);
va_end (arg_ptr);
return err;
}
/* Same as status_printf but takes a status number instead of a
* keyword. */
gpg_error_t
status_no_printf (ctrl_t ctrl, int no, const char *format, ...)
{
gpg_error_t err;
va_list arg_ptr;
assuan_context_t ctx;
if (!ctrl || !the_assuan_ctx_func || !(ctx = the_assuan_ctx_func (ctrl)))
return 0;
va_start (arg_ptr, format);
err = vprint_assuan_status (ctx, get_status_string (no), format, arg_ptr);
va_end (arg_ptr);
return err;
}

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