| 1 | /* Implement the snprintf function. |
| 2 | Copyright (C) 2003, 2011 Free Software Foundation, Inc. |
| 3 | Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>. |
| 4 | |
| 5 | This file is part of the libiberty library. This library is free |
| 6 | software; you can redistribute it and/or modify it under the |
| 7 | terms of the GNU General Public License as published by the |
| 8 | Free Software Foundation; either version 2, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | This library is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GNU CC; see the file COPYING. If not, write to |
| 18 | the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. |
| 19 | |
| 20 | As a special exception, if you link this library with files |
| 21 | compiled with a GNU compiler to produce an executable, this does not cause |
| 22 | the resulting executable to be covered by the GNU General Public License. |
| 23 | This exception does not however invalidate any other reasons why |
| 24 | the executable file might be covered by the GNU General Public License. */ |
| 25 | |
| 26 | /* |
| 27 | |
| 28 | @deftypefn Supplemental int snprintf (char *@var{buf}, size_t @var{n}, @ |
| 29 | const char *@var{format}, ...) |
| 30 | |
| 31 | This function is similar to @code{sprintf}, but it will write to |
| 32 | @var{buf} at most @code{@var{n}-1} bytes of text, followed by a |
| 33 | terminating null byte, for a total of @var{n} bytes. |
| 34 | On error the return value is -1, otherwise it returns the number of |
| 35 | bytes, not including the terminating null byte, that would have been |
| 36 | written had @var{n} been sufficiently large, regardless of the actual |
| 37 | value of @var{n}. Note some pre-C99 system libraries do not implement |
| 38 | this correctly so users cannot generally rely on the return value if |
| 39 | the system version of this function is used. |
| 40 | |
| 41 | @end deftypefn |
| 42 | |
| 43 | */ |
| 44 | |
| 45 | #include "ansidecl.h" |
| 46 | |
| 47 | #include <stdarg.h> |
| 48 | #include <stddef.h> |
| 49 | |
| 50 | int vsnprintf (char *, size_t, const char *, va_list); |
| 51 | |
| 52 | int |
| 53 | snprintf (char *s, size_t n, const char *format, ...) |
| 54 | { |
| 55 | int result; |
| 56 | VA_OPEN (ap, format); |
| 57 | VA_FIXEDARG (ap, char *, s); |
| 58 | VA_FIXEDARG (ap, size_t, n); |
| 59 | VA_FIXEDARG (ap, const char *, format); |
| 60 | result = vsnprintf (s, n, format, ap); |
| 61 | VA_CLOSE (ap); |
| 62 | return result; |
| 63 | } |