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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* util/support/printf.c */
/*
* Copyright 2003, 2004, 2005, 2007, 2008 Massachusetts Institute of
* Technology. All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
/* Provide {,v}asprintf for platforms that don't have them. */
#include "k5-platform.h"
/* On error: BSD: Set *ret to NULL. GNU: *ret is undefined.
Since we want to be able to use the GNU version directly, we need
provide only the weaker guarantee in this version. */
int
krb5int_vasprintf(char **ret, const char *format, va_list ap)
{
va_list ap2;
char *str = NULL, *nstr;
size_t len = 80;
int len2;
while (1) {
if (len >= INT_MAX || len == 0)
goto fail;
nstr = realloc(str, len);
if (nstr == NULL)
goto fail;
str = nstr;
va_copy(ap2, ap);
len2 = vsnprintf(str, len, format, ap2);
va_end(ap2);
/* ISO C vsnprintf returns the needed length. Some old
vsnprintf implementations return -1 on truncation. */
if (len2 < 0) {
/* Don't know how much space we need, just that we didn't
supply enough; get a bigger buffer and try again. */
if (len <= SIZE_MAX/2)
len *= 2;
else if (len < SIZE_MAX)
len = SIZE_MAX;
else
goto fail;
} else if ((unsigned int) len2 >= SIZE_MAX) {
/* Need more space than we can request. */
goto fail;
} else if ((size_t) len2 >= len) {
/* Need more space, but we know how much. */
len = (size_t) len2 + 1;
} else {
/* Success! */
break;
}
}
/* We might've allocated more than we need, if we're still using
the initial guess, or we got here by doubling. */
if ((size_t) len2 < len - 1) {
nstr = realloc(str, (size_t) len2 + 1);
if (nstr)
str = nstr;
}
*ret = str;
return len2;
fail:
free(str);
return -1;
}
int
krb5int_asprintf(char **ret, const char *format, ...)
{
va_list ap;
int n;
va_start(ap, format);
n = krb5int_vasprintf(ret, format, ap);
va_end(ap);
return n;
}
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