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/* Like vsprintf but provides a pointer to malloc'd storage, which must
be freed by the caller.
Copyright (C) 1994 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <string.h>
#if __STDC__
# include <stdarg.h>
#else
# include <varargs.h>
#endif
#ifdef TEST
int global_total_width;
#endif
unsigned long strtoul ();
char *malloc ();
static int
int_vasprintf (result, format, args)
char **result;
const char *format;
va_list *args;
{
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;
memcpy (&ap, args, sizeof (va_list));
while (*p != '\0')
{
if (*p++ == '%')
{
while (strchr ("-+ #0", *p))
++p;
if (*p == '*')
{
++p;
total_width += abs (va_arg (ap, int));
}
else
total_width += strtoul (p, &p, 10);
if (*p == '.')
{
++p;
if (*p == '*')
{
++p;
total_width += abs (va_arg (ap, int));
}
else
total_width += strtoul (p, &p, 10);
}
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;
}
}
}
#ifdef TEST
global_total_width = total_width;
#endif
*result = malloc (total_width);
if (*result != NULL)
return vsprintf (*result, format, *args);
else
return 0;
}
int
vasprintf (result, format, args)
char **result;
const char *format;
va_list args;
{
return int_vasprintf (result, format, &args);
}
int
asprintf
#if __STDC__
(char **result, const char *format, ...)
#else
(result, va_alist)
char **result;
va_dcl
#endif
{
va_list args;
int done;
#if __STDC__
va_start (args, format);
#else
char *format;
va_start (args);
format = va_arg (args, char *);
#endif
done = vasprintf (result, format, args);
va_end (args);
return done;
}
#ifdef TEST
void
checkit
#if __STDC__
(const char* format, ...)
#else
(va_alist)
va_dcl
#endif
{
va_list args;
char *result;
#if __STDC__
va_start (args, format);
#else
char *format;
va_start (args);
format = va_arg (args, char *);
#endif
vasprintf (&result, format, args);
if (strlen (result) < global_total_width)
printf ("PASS: ");
else
printf ("FAIL: ");
printf ("%d %s\n", global_total_width, result);
}
int
main ()
{
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");
}
#endif /* TEST */
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