newlib/libc/stdio/asprintf.c

   1 /*
   2  * Copyright (c) 1990, 2007 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms are permitted
   6  * provided that the above copyright notice and this paragraph are
   7  * duplicated in all such forms and that any documentation,
   8  * and/or other materials related to such
   9  * distribution and use acknowledge that the software was developed
  10  * by the University of California, Berkeley.  The name of the
  11  * University may not be used to endorse or promote products derived
  12  * from this software without specific prior written permission.
  13  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  16  */
  17 /* This code was copied from sprintf.c */
  18 /* doc in sprintf.c */
  19
  20 #include <_ansi.h>
  21 #include <reent.h>
  22 #include <stdio.h>
  23 #include <stdarg.h>
  24 #include <limits.h>
  25 #include "local.h"
  26
  27 int
  28 _asprintf_r (struct _reent *ptr,
  29        char **__restrict strp,
  30        const char *__restrict fmt, ...)
  31 {
  32   int ret;
  33   va_list ap;
  34   FILE f;
  35
  36   /* mark a zero-length reallocatable buffer */
  37   f._flags = __SWR | __SSTR | __SMBF;
  38   f._flags2 = 0;
  39   f._bf._base = f._p = NULL;
  40   f._bf._size = f._w = 0;
  41   f._file = -1;  /* No file. */
  42   va_start (ap, fmt);
  43   ret = _svfprintf_r (ptr, &f, fmt, ap);
  44   va_end (ap);
  45   if (ret >= 0)
  46     {
  47       *f._p = 0;
  48       *strp = (char *) f._bf._base;
  49     }
  50   return (ret);
  51 }
  52
  53 #ifdef _NANO_FORMATTED_IO
  54 int
  55 _asiprintf_r (struct _reent *, char **, const char *, ...)
  56        _ATTRIBUTE ((__alias__("_asprintf_r")));
  57 #endif
  58
  59 #ifndef _REENT_ONLY
  60
  61 int
  62 asprintf (char **__restrict strp,
  63        const char *__restrict fmt, ...)
  64 {
  65   int ret;
  66   va_list ap;
  67   FILE f;
  68
  69   /* mark a zero-length reallocatable buffer */
  70   f._flags = __SWR | __SSTR | __SMBF;
  71   f._flags2 = 0;
  72   f._bf._base = f._p = NULL;
  73   f._bf._size = f._w = 0;
  74   f._file = -1;  /* No file. */
  75   va_start (ap, fmt);
  76   ret = _svfprintf_r (_REENT, &f, fmt, ap);
  77   va_end (ap);
  78   if (ret >= 0)
  79     {
  80       *f._p = 0;
  81       *strp = (char *) f._bf._base;
  82     }
  83   return (ret);
  84 }
  85
  86 #ifdef _NANO_FORMATTED_IO
  87 int
  88 asiprintf (char **, const char *, ...)
  89        _ATTRIBUTE ((__alias__("asprintf")));
  90 #endif
  91 #endif /* ! _REENT_ONLY */