binutils-gdb/libiberty/vasprintf.c

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/* Like vsprintf but provides a pointer to malloc'd storage, which must
be freed by the caller.
Copyright (C) 1994, 2003, 2011 Free Software Foundation, Inc.
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This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
Libiberty 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA. */
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <ansidecl.h>
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#include <stdarg.h>
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#if !defined (va_copy) && defined (__va_copy)
# define va_copy(d,s) __va_copy((d),(s))
#endif
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#include <stdio.h>
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#else
extern unsigned long strtoul ();
extern PTR malloc ();
#endif
#include "libiberty.h"
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#ifdef TEST
int global_total_width;
#endif
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/*
@deftypefn Extension int vasprintf (char **@var{resptr}, @
const char *@var{format}, va_list @var{args})
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Like @code{vsprintf}, but instead of passing a pointer to a buffer,
you pass a pointer to a pointer. This function will compute the size
of the buffer needed, allocate memory with @code{malloc}, and store a
pointer to the allocated memory in @code{*@var{resptr}}. The value
returned is the same as @code{vsprintf} would return. If memory could
not be allocated, minus one is returned and @code{NULL} is stored in
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@code{*@var{resptr}}.
@end deftypefn
*/
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static int int_vasprintf (char **, const char *, va_list);
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static int
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int_vasprintf (char **result, const char *format, va_list args)
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{
const char *p = format;
/* Add one to make sure that it is never zero, which might cause malloc
to return NULL. */
int total_width = strlen (format) + 1;
va_list ap;
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#ifdef va_copy
va_copy (ap, args);
#else
memcpy ((PTR) &ap, (PTR) &args, sizeof (va_list));
#endif
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while (*p != '\0')
{
if (*p++ == '%')
{
while (strchr ("-+ #0", *p))
++p;
if (*p == '*')
{
++p;
total_width += abs (va_arg (ap, int));
}
else
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total_width += strtoul (p, (char **) &p, 10);
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if (*p == '.')
{
++p;
if (*p == '*')
{
++p;
total_width += abs (va_arg (ap, int));
}
else
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total_width += strtoul (p, (char **) &p, 10);
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}
while (strchr ("hlL", *p))
++p;
/* Should be big enough for any format specifier except %s and floats. */
total_width += 30;
switch (*p)
{
case 'd':
case 'i':
case 'o':
case 'u':
case 'x':
case 'X':
case 'c':
(void) va_arg (ap, int);
break;
case 'f':
case 'e':
case 'E':
case 'g':
case 'G':
(void) va_arg (ap, double);
/* Since an ieee double can have an exponent of 307, we'll
make the buffer wide enough to cover the gross case. */
total_width += 307;
break;
case 's':
total_width += strlen (va_arg (ap, char *));
break;
case 'p':
case 'n':
(void) va_arg (ap, char *);
break;
}
p++;
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}
}
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#ifdef va_copy
va_end (ap);
#endif
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#ifdef TEST
global_total_width = total_width;
#endif
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*result = (char *) malloc (total_width);
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if (*result != NULL)
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return vsprintf (*result, format, args);
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else
return -1;
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}
int
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vasprintf (char **result, const char *format,
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#if defined (_BSD_VA_LIST_) && defined (__FreeBSD__)
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_BSD_VA_LIST_ args)
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#else
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va_list args)
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#endif
{
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return int_vasprintf (result, format, args);
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}
#ifdef TEST
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static void ATTRIBUTE_PRINTF_1
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checkit (const char *format, ...)
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{
char *result;
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VA_OPEN (args, format);
VA_FIXEDARG (args, const char *, format);
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vasprintf (&result, format, args);
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VA_CLOSE (args);
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if (strlen (result) < (size_t) global_total_width)
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printf ("PASS: ");
else
printf ("FAIL: ");
printf ("%d %s\n", global_total_width, result);
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free (result);
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}
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extern int main (void);
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int
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main (void)
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{
checkit ("%d", 0x12345678);
checkit ("%200d", 5);
checkit ("%.300d", 6);
checkit ("%100.150d", 7);
checkit ("%s", "jjjjjjjjjiiiiiiiiiiiiiiioooooooooooooooooppppppppppppaa\n\
777777777777777777333333333333366666666666622222222222777777777777733333");
checkit ("%f%s%d%s", 1.0, "foo", 77, "asdjffffffffffffffiiiiiiiiiiixxxxx");
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return 0;
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}
#endif /* TEST */