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  1. /*
  2.  * Copyright (c) 2006 Josef Cejka
  3.  * Copyright (c) 2008 Jakub Jermar
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. /** @addtogroup libc
  31.  * @{
  32.  */
  33. /** @file
  34.  */
  35.  
  36. #include <stdarg.h>
  37. #include <stdio.h>
  38. #include <stdlib.h>
  39. #include <io/printf_core.h>
  40.  
  41. static int asprintf_prewrite(const char *str, size_t count, void *unused)
  42. {
  43.     return count;
  44. }
  45.  
  46. /** Allocate and print to string.
  47.  *
  48.  * @param strp      Address of the pointer where to store the address of
  49.  *          the newly allocated string.
  50.  * @fmt         Format strin.
  51.  *
  52.  * @return      Number of characters printed or a negative error code.
  53.  */
  54. int asprintf(char **strp, const char *fmt, ...)
  55. {
  56.     struct printf_spec ps = {
  57.          asprintf_prewrite,
  58.          NULL
  59.     };
  60.     int ret;
  61.     va_list args;
  62.  
  63.     va_start(args, fmt);
  64.     ret = printf_core(fmt, &ps, args);
  65.     va_end(args);
  66.     if (ret > 0) {
  67.         *strp = malloc(ret + 20);
  68.         if (!*strp)
  69.             return -1;
  70.         va_start(args, fmt);
  71.         vsprintf(*strp, fmt, args);
  72.         va_end(args);      
  73.     }
  74.  
  75.     return ret;
  76. }
  77.  
  78. /** @}
  79.  */
  80.