|
Packit |
bbfece |
/* Implement the vsnprintf function.
|
|
Packit |
bbfece |
Copyright (C) 2003-2018 Free Software Foundation, Inc.
|
|
Packit |
bbfece |
Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>.
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
This file is part of the libiberty library. This library is free
|
|
Packit |
bbfece |
software; you can redistribute it and/or modify it under the
|
|
Packit |
bbfece |
terms of the GNU General Public License as published by the
|
|
Packit |
bbfece |
Free Software Foundation; either version 2, or (at your option)
|
|
Packit |
bbfece |
any later version.
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
This library is distributed in the hope that it will be useful,
|
|
Packit |
bbfece |
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit |
bbfece |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
Packit |
bbfece |
GNU General Public License for more details.
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
You should have received a copy of the GNU General Public License
|
|
Packit |
bbfece |
along with GNU CC; see the file COPYING. If not, write to
|
|
Packit |
bbfece |
the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
As a special exception, if you link this library with files
|
|
Packit |
bbfece |
compiled with a GNU compiler to produce an executable, this does not cause
|
|
Packit |
bbfece |
the resulting executable to be covered by the GNU General Public License.
|
|
Packit |
bbfece |
This exception does not however invalidate any other reasons why
|
|
Packit |
bbfece |
the executable file might be covered by the GNU General Public License. */
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
/*
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
@deftypefn Supplemental int vsnprintf (char *@var{buf}, size_t @var{n}, @
|
|
Packit |
bbfece |
const char *@var{format}, va_list @var{ap})
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
This function is similar to @code{vsprintf}, but it will write to
|
|
Packit |
bbfece |
@var{buf} at most @code{@var{n}-1} bytes of text, followed by a
|
|
Packit |
bbfece |
terminating null byte, for a total of @var{n} bytes. On error the
|
|
Packit |
bbfece |
return value is -1, otherwise it returns the number of characters that
|
|
Packit |
bbfece |
would have been printed had @var{n} been sufficiently large,
|
|
Packit |
bbfece |
regardless of the actual value of @var{n}. Note some pre-C99 system
|
|
Packit |
bbfece |
libraries do not implement this correctly so users cannot generally
|
|
Packit |
bbfece |
rely on the return value if the system version of this function is
|
|
Packit |
bbfece |
used.
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
@end deftypefn
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
*/
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
#include "config.h"
|
|
Packit |
bbfece |
#include "ansidecl.h"
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
#include <stdarg.h>
|
|
Packit |
bbfece |
#ifdef HAVE_STRING_H
|
|
Packit |
bbfece |
#include <string.h>
|
|
Packit |
bbfece |
#endif
|
|
Packit |
bbfece |
#ifdef HAVE_STDLIB_H
|
|
Packit |
bbfece |
#include <stdlib.h>
|
|
Packit |
bbfece |
#endif
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
#include "libiberty.h"
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
/* This implementation relies on a working vasprintf. */
|
|
Packit |
bbfece |
int
|
|
Packit |
bbfece |
vsnprintf (char *s, size_t n, const char *format, va_list ap)
|
|
Packit |
bbfece |
{
|
|
Packit |
bbfece |
char *buf = 0;
|
|
Packit |
bbfece |
int result = vasprintf (&buf, format, ap);
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
if (!buf)
|
|
Packit |
bbfece |
return -1;
|
|
Packit |
bbfece |
if (result < 0)
|
|
Packit |
bbfece |
{
|
|
Packit |
bbfece |
free (buf);
|
|
Packit |
bbfece |
return -1;
|
|
Packit |
bbfece |
}
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
result = strlen (buf);
|
|
Packit |
bbfece |
if (n > 0)
|
|
Packit |
bbfece |
{
|
|
Packit |
bbfece |
if ((long) n > result)
|
|
Packit |
bbfece |
memcpy (s, buf, result+1);
|
|
Packit |
bbfece |
else
|
|
Packit |
bbfece |
{
|
|
Packit |
bbfece |
memcpy (s, buf, n-1);
|
|
Packit |
bbfece |
s[n - 1] = 0;
|
|
Packit |
bbfece |
}
|
|
Packit |
bbfece |
}
|
|
Packit |
bbfece |
free (buf);
|
|
Packit |
bbfece |
return result;
|
|
Packit |
bbfece |
}
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
#ifdef TEST
|
|
Packit |
bbfece |
/* Set the buffer to a known state. */
|
|
Packit |
bbfece |
#define CLEAR(BUF) do { memset ((BUF), 'X', sizeof (BUF)); (BUF)[14] = '\0'; } while (0)
|
|
Packit |
bbfece |
/* For assertions. */
|
|
Packit |
bbfece |
#define VERIFY(P) do { if (!(P)) abort(); } while (0)
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
static int ATTRIBUTE_PRINTF_3
|
|
Packit |
bbfece |
checkit (char *s, size_t n, const char *format, ...)
|
|
Packit |
bbfece |
{
|
|
Packit |
bbfece |
int result;
|
|
Packit |
bbfece |
va_list ap;
|
|
Packit |
bbfece |
va_start (ap, format);
|
|
Packit |
bbfece |
result = vsnprintf (s, n, format, ap);
|
|
Packit |
bbfece |
va_end (ap);
|
|
Packit |
bbfece |
return result;
|
|
Packit |
bbfece |
}
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
extern int main (void);
|
|
Packit |
bbfece |
int
|
|
Packit |
bbfece |
main (void)
|
|
Packit |
bbfece |
{
|
|
Packit |
bbfece |
char buf[128];
|
|
Packit |
bbfece |
int status;
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
CLEAR (buf);
|
|
Packit |
bbfece |
status = checkit (buf, 10, "%s:%d", "foobar", 9);
|
|
Packit |
bbfece |
VERIFY (status==8 && memcmp (buf, "foobar:9\0XXXXX\0", 15) == 0);
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
CLEAR (buf);
|
|
Packit |
bbfece |
status = checkit (buf, 9, "%s:%d", "foobar", 9);
|
|
Packit |
bbfece |
VERIFY (status==8 && memcmp (buf, "foobar:9\0XXXXX\0", 15) == 0);
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
CLEAR (buf);
|
|
Packit |
bbfece |
status = checkit (buf, 8, "%s:%d", "foobar", 9);
|
|
Packit |
bbfece |
VERIFY (status==8 && memcmp (buf, "foobar:\0XXXXXX\0", 15) == 0);
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
CLEAR (buf);
|
|
Packit |
bbfece |
status = checkit (buf, 7, "%s:%d", "foobar", 9);
|
|
Packit |
bbfece |
VERIFY (status==8 && memcmp (buf, "foobar\0XXXXXXX\0", 15) == 0);
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
CLEAR (buf);
|
|
Packit |
bbfece |
status = checkit (buf, 6, "%s:%d", "foobar", 9);
|
|
Packit |
bbfece |
VERIFY (status==8 && memcmp (buf, "fooba\0XXXXXXXX\0", 15) == 0);
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
CLEAR (buf);
|
|
Packit |
bbfece |
status = checkit (buf, 2, "%s:%d", "foobar", 9);
|
|
Packit |
bbfece |
VERIFY (status==8 && memcmp (buf, "f\0XXXXXXXXXXXX\0", 15) == 0);
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
CLEAR (buf);
|
|
Packit |
bbfece |
status = checkit (buf, 1, "%s:%d", "foobar", 9);
|
|
Packit |
bbfece |
VERIFY (status==8 && memcmp (buf, "\0XXXXXXXXXXXXX\0", 15) == 0);
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
CLEAR (buf);
|
|
Packit |
bbfece |
status = checkit (buf, 0, "%s:%d", "foobar", 9);
|
|
Packit |
bbfece |
VERIFY (status==8 && memcmp (buf, "XXXXXXXXXXXXXX\0", 15) == 0);
|
|
Packit |
bbfece |
|
|
Packit |
bbfece |
return 0;
|
|
Packit |
bbfece |
}
|
|
Packit |
bbfece |
#endif /* TEST */
|