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assuan-util.c
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/* assuan-util.c - Utility functions for Assuan
* Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
*
* This file is part of Assuan.
*
* Assuan is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Assuan 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "assuan-defs.h"
static void *(*alloc_func)(size_t n) = malloc;
static void *(*realloc_func)(void *p, size_t n) = realloc;
static void (*free_func)(void*) = free;
void
assuan_set_malloc_hooks ( void *(*new_alloc_func)(size_t n),
void *(*new_realloc_func)(void *p, size_t n),
void (*new_free_func)(void*) )
{
alloc_func = new_alloc_func;
realloc_func = new_realloc_func;
free_func = new_free_func;
}
void *
_assuan_malloc (size_t n)
{
return alloc_func (n);
}
void *
_assuan_realloc (void *a, size_t n)
{
return realloc_func (a, n);
}
void *
_assuan_calloc (size_t n, size_t m)
{
void *p;
size_t nbytes;
nbytes = n * m;
if (m && nbytes / m != n)
{
errno = ENOMEM;
return NULL;
}
p = _assuan_malloc (nbytes);
if (p)
memset (p, 0, nbytes);
return p;
}
void
_assuan_free (void *p)
{
if (p)
free_func (p);
}
/* Store the error in the context so that the error sending function
can take out a descriptive text. Inside the assuan code, use the
macro set_error instead of this function. */
int
assuan_set_error (assuan_context_t ctx, int err, const char *text)
{
ctx->err_no = err;
ctx->err_str = text;
return err;
}
void
assuan_set_pointer (assuan_context_t ctx, void *pointer)
{
if (ctx)
ctx->user_pointer = pointer;
}
void *
assuan_get_pointer (assuan_context_t ctx)
{
return ctx? ctx->user_pointer : NULL;
}
void
assuan_set_log_stream (assuan_context_t ctx, FILE *fp)
{
if (ctx)
{
if (ctx->log_fp)
fflush (ctx->log_fp);
ctx->log_fp = fp;
_assuan_set_default_log_stream (fp);
}
}
void
assuan_begin_confidential (assuan_context_t ctx)
{
if (ctx)
{
ctx->confidential = 1;
}
}
void
assuan_end_confidential (assuan_context_t ctx)
{
if (ctx)
{
ctx->confidential = 0;
}
}
/* For context CTX, set the flag FLAG to VALUE. Values for flags
are usually 1 or 0 but certain flags might allow for other values;
see the description of the type assuan_flag_t for details. */
void
assuan_set_flag (assuan_context_t ctx, assuan_flag_t flag, int value)
{
if (!ctx)
return;
switch (flag)
{
case ASSUAN_NO_WAITPID: ctx->flags.no_waitpid = value; break;
}
}
/* Return the VALUE of FLAG in context CTX. */
int
assuan_get_flag (assuan_context_t ctx, assuan_flag_t flag)
{
if (!ctx)
return 0;
switch (flag)
{
case ASSUAN_NO_WAITPID: return ctx->flags.no_waitpid;
}
return 0;
}
/* Dump a possibly binary string (used for debugging). Distinguish
ascii text from binary and print it accordingly. */
void
_assuan_log_print_buffer (FILE *fp, const void *buffer, size_t length)
{
const unsigned char *s;
int n;
for (n=length,s=buffer; n; n--, s++)
if ((!isascii (*s) || iscntrl (*s) || !isprint (*s)) && !(*s >= 0x80))
break;
s = buffer;
if (!n && *s != '[')
fwrite (buffer, length, 1, fp);
else
{
#ifdef HAVE_FLOCKFILE
flockfile (fp);
#endif
putc_unlocked ('[', fp);
for (n=0; n < length; n++, s++)
fprintf (fp, " %02x", *s);
putc_unlocked (' ', fp);
putc_unlocked (']', fp);
#ifdef HAVE_FUNLOCKFILE
funlockfile (fp);
#endif
}
}
/* Log a user supplied string. Escapes non-printable before
printing. */
void
_assuan_log_sanitized_string (const char *string)
{
const unsigned char *s = string;
FILE *fp = assuan_get_assuan_log_stream ();
if (! *s)
return;
#ifdef HAVE_FLOCKFILE
flockfile (fp);
#endif
for (; *s; s++)
{
int c = 0;
switch (*s)
{
case '\r':
c = 'r';
break;
case '\n':
c = 'n';
break;
case '\f':
c = 'f';
break;
case '\v':
c = 'v';
break;
case '\b':
c = 'b';
break;
default:
if ((isascii (*s) && isprint (*s)) || (*s >= 0x80))
putc_unlocked (*s, fp);
else
{
putc_unlocked ('\\', fp);
fprintf (fp, "x%02x", *s);
}
}
if (c)
{
putc_unlocked ('\\', fp);
putc_unlocked (c, fp);
}
}
#ifdef HAVE_FUNLOCKFILE
funlockfile (fp);
#endif
}

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