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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 <string.h>
  40. #include <io/printf_core.h>
  41.  
  42. static int asprintf_str_write(const char *str, size_t count, void *unused)
  43. {
  44.     return str_nlength(str, count);
  45. }
  46.  
  47. static int asprintf_wstr_write(const wchar_t *str, size_t count, void *unused)
  48. {
  49.     return wstr_nlength(str, count);
  50. }
  51.  
  52. /** Allocate and print to string.
  53.  *
  54.  * @param strp Address of the pointer where to store the address of
  55.  *             the newly allocated string.
  56.  * @fmt        Format string.
  57.  *
  58.  * @return Number of characters printed or a negative error code.
  59.  *
  60.  */
  61. int asprintf(char **strp, const char *fmt, ...)
  62. {
  63.     struct printf_spec ps = {
  64.         asprintf_str_write,
  65.         asprintf_wstr_write,
  66.         NULL
  67.     };
  68.    
  69.     va_list args;
  70.     va_start(args, fmt);
  71.    
  72.     int ret = printf_core(fmt, &ps, args);
  73.     va_end(args);
  74.    
  75.     if (ret > 0) {
  76.         *strp = malloc(STR_BOUNDS(ret) + 1);
  77.         if (*strp == NULL)
  78.             return -1;
  79.        
  80.         va_start(args, fmt);
  81.         vsnprintf(*strp, STR_BOUNDS(ret) + 1, fmt, args);
  82.         va_end(args);
  83.     }
  84.    
  85.     return ret;
  86. }
  87.  
  88. /** @}
  89.  */
  90.