1 /* Implement the snprintf function. 2 Copyright (C) 2003 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}, const char *@var{format}, ...) 29 30 This function is similar to @code{sprintf}, but it will write to 31 @var{buf} at most @code{@var{n}-1} bytes of text, followed by a 32 terminating null byte, for a total of @var{n} bytes. 33 On error the return value is -1, otherwise it returns the number of 34 bytes, not including the terminating null byte, that would have been 35 written had @var{n} been sufficiently large, regardless of the actual 36 value of @var{n}. Note some pre-C99 system libraries do not implement 37 this correctly so users cannot generally rely on the return value if 38 the system version of this function is used. 39 40 @end deftypefn 41 42 */ 43 44 #include "ansidecl.h" 45 46 #include <stdarg.h> 47 #include <stddef.h> 48 49 int vsnprintf (char *, size_t, const char *, va_list); 50 51 int 52 snprintf (char *s, size_t n, const char *format, ...) 53 { 54 int result; 55 VA_OPEN (ap, format); 56 VA_FIXEDARG (ap, char *, s); 57 VA_FIXEDARG (ap, size_t, n); 58 VA_FIXEDARG (ap, const char *, format); 59 result = vsnprintf (s, n, format, ap); 60 VA_CLOSE (ap); 61 return result; 62 } 63