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/* Like vsprintf but provides a pointer to malloc'd storage, which must
be freed by the caller.
Copyright (C) 1994, 1998, 1999, 2000-2003, 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#include <config.h>
/* Specification. */
#include "vasprintf.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <math.h>
#ifdef TEST
size_t global_total_width;
#endif
static int
int_vasprintf (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. */
size_t total_width = strlen (format) + 1;
va_list ap = *args;
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, (char **) &p, 10);
if (*p == '.')
{
++p;
if (*p == '*')
{
++p;
total_width += abs (va_arg (ap, int));
}
else
total_width += strtoul (p, (char **) &p, 10);
}
while (strchr ("hlLjtz", *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 'F':
{
double arg = va_arg (ap, double);
if (arg >= 1.0 || arg <= -1.0)
/* 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 'e':
case 'E':
case 'g':
case 'G':
(void) va_arg (ap, double);
break;
case 's':
total_width += strlen (va_arg (ap, char *));
break;
case 'p':
case 'n':
(void) va_arg (ap, char *);
break;
}
p++;
}
}
#ifdef TEST
global_total_width = total_width;
#endif
*result = malloc (total_width);
if (*result != NULL)
return vsprintf (*result, format, *args);
else
return -1;
}
int
vasprintf (char **result, const char *format, va_list args)
{
return int_vasprintf (result, format, &args);
}
int
asprintf (char **result, const char *format, ...)
{
va_list args;
int done;
va_start (args, format);
done = vasprintf (result, format, args);
va_end (args);
return done;
}
/* ========================= test program ========================= */
#ifdef TEST
#include <float.h>
void
checkit (const char* format, ...)
{
va_list args;
char *result;
va_start (args, format);
vasprintf (&result, format, args);
if (strlen (result) < global_total_width)
printf ("PASS: ");
else
printf ("FAIL: ");
printf ("%lu %s\n", (unsigned long) 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");
checkit ("%e", DBL_MIN);
checkit ("%e", DBL_MAX);
checkit ("%.400f", DBL_MIN);
checkit ("%f", DBL_MAX);
checkit ("%g", DBL_MIN);
checkit ("%g", DBL_MAX);
return 0;
}
#endif /* TEST */
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