gsasl  1.10.0
About: GNU SASL is an implementation of the Simple Authentication and Security Layer (SASL). Development version.
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vasnprintf.h
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1 /* vsprintf with automatic memory allocation.
2  Copyright (C) 2002-2004, 2007-2021 Free Software Foundation, Inc.
3 
4  This program is free software; you can redistribute it and/or modify
5  it under the terms of the GNU General Public License as published by
6  the Free Software Foundation; either version 3, or (at your option)
7  any later version.
8 
9  This program is distributed in the hope that it will be useful,
10  but WITHOUT ANY WARRANTY; without even the implied warranty of
11  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  GNU General Public License for more details.
13 
14  You should have received a copy of the GNU General Public License along
15  with this program; if not, see <https://www.gnu.org/licenses/>. */
16 
17 #ifndef _VASNPRINTF_H
18 #define _VASNPRINTF_H
19 
20 /* Get va_list. */
21 #include <stdarg.h>
22 
23 /* Get size_t. */
24 #include <stddef.h>
25 
26 /* Get _GL_ATTRIBUTE_SPEC_PRINTF_STANDARD. */
27 #include <stdio.h>
28 
29 #ifdef __cplusplus
30 extern "C" {
31 #endif
32 
33 /* Write formatted output to a string dynamically allocated with malloc().
34  You can pass a preallocated buffer for the result in RESULTBUF and its
35  size in *LENGTHP; otherwise you pass RESULTBUF = NULL.
36  If successful, return the address of the string (this may be = RESULTBUF
37  if no dynamic memory allocation was necessary) and set *LENGTHP to the
38  number of resulting bytes, excluding the trailing NUL. Upon error, set
39  errno and return NULL.
40 
41  When dynamic memory allocation occurs, the preallocated buffer is left
42  alone (with possibly modified contents). This makes it possible to use
43  a statically allocated or stack-allocated buffer, like this:
44 
45  char buf[100];
46  size_t len = sizeof (buf);
47  char *output = vasnprintf (buf, &len, format, args);
48  if (output == NULL)
49  ... error handling ...;
50  else
51  {
52  ... use the output string ...;
53  if (output != buf)
54  free (output);
55  }
56  */
57 #if REPLACE_VASNPRINTF
58 # define asnprintf rpl_asnprintf
59 # define vasnprintf rpl_vasnprintf
60 #endif
61 extern char * asnprintf (char *restrict resultbuf, size_t *lengthp,
62  const char *format, ...)
64 extern char * vasnprintf (char *restrict resultbuf, size_t *lengthp,
65  const char *format, va_list args)
67 
68 #ifdef __cplusplus
69 }
70 #endif
71 
72 #endif /* _VASNPRINTF_H */
#define restrict
Definition: config.h:69
#define _GL_ATTRIBUTE_SPEC_PRINTF_STANDARD
Definition: stdio.in.h:81
#define _GL_ATTRIBUTE_FORMAT(spec)
Definition: stdio.in.h:69
char char * vasnprintf(char *restrict resultbuf, size_t *lengthp, const char *format, va_list args) _GL_ATTRIBUTE_FORMAT((_GL_ATTRIBUTE_SPEC_PRINTF_STANDARD
char * asnprintf(char *restrict resultbuf, size_t *lengthp, const char *format,...) _GL_ATTRIBUTE_FORMAT((_GL_ATTRIBUTE_SPEC_PRINTF_STANDARD