| /* vsprintf with automatic memory allocation. |
| Copyright (C) 2002-2004, 2007-2016 Free Software Foundation, Inc. |
| |
| This program 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, or (at your option) |
| any later version. |
| |
| This program 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, see <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _VASNPRINTF_H |
| #define _VASNPRINTF_H |
| |
| /* Get va_list. */ |
| #include <stdarg.h> |
| |
| /* Get size_t. */ |
| #include <stddef.h> |
| |
| /* The __attribute__ feature is available in gcc versions 2.5 and later. |
| The __-protected variants of the attributes 'format' and 'printf' are |
| accepted by gcc versions 2.6.4 (effectively 2.7) and later. |
| We enable _GL_ATTRIBUTE_FORMAT only if these are supported too, because |
| gnulib and libintl do '#define printf __printf__' when they override |
| the 'printf' function. */ |
| #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7) |
| # define _GL_ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec)) |
| #else |
| # define _GL_ATTRIBUTE_FORMAT(spec) /* empty */ |
| #endif |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* Write formatted output to a string dynamically allocated with malloc(). |
| You can pass a preallocated buffer for the result in RESULTBUF and its |
| size in *LENGTHP; otherwise you pass RESULTBUF = NULL. |
| If successful, return the address of the string (this may be = RESULTBUF |
| if no dynamic memory allocation was necessary) and set *LENGTHP to the |
| number of resulting bytes, excluding the trailing NUL. Upon error, set |
| errno and return NULL. |
| |
| When dynamic memory allocation occurs, the preallocated buffer is left |
| alone (with possibly modified contents). This makes it possible to use |
| a statically allocated or stack-allocated buffer, like this: |
| |
| char buf[100]; |
| size_t len = sizeof (buf); |
| char *output = vasnprintf (buf, &len, format, args); |
| if (output == NULL) |
| ... error handling ...; |
| else |
| { |
| ... use the output string ...; |
| if (output != buf) |
| free (output); |
| } |
| */ |
| #if REPLACE_VASNPRINTF |
| # define asnprintf rpl_asnprintf |
| # define vasnprintf rpl_vasnprintf |
| #endif |
| extern char * asnprintf (char *resultbuf, size_t *lengthp, const char *format, ...) |
| _GL_ATTRIBUTE_FORMAT ((__printf__, 3, 4)); |
| extern char * vasnprintf (char *resultbuf, size_t *lengthp, const char *format, va_list args) |
| _GL_ATTRIBUTE_FORMAT ((__printf__, 3, 0)); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _VASNPRINTF_H */ |