118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/* Copyright (C) 2007, 2008 Eric Blake
|
|
* Permission to use, copy, modify, and distribute this software
|
|
* is freely granted, provided that this notice is preserved.
|
|
*/
|
|
/* This code was derived from asprintf.c */
|
|
/* doc in sprintf.c */
|
|
|
|
#include <_ansi.h>
|
|
#include <reent.h>
|
|
#include <stdio.h>
|
|
#include <stdarg.h>
|
|
#include <limits.h>
|
|
#include <errno.h>
|
|
#include "local.h"
|
|
|
|
char *
|
|
_asnprintf_r (struct _reent *__restrict ptr,
|
|
char *buf,
|
|
size_t *lenp,
|
|
const char *__restrict fmt, ...)
|
|
{
|
|
int ret;
|
|
va_list ap;
|
|
FILE f;
|
|
size_t len = *lenp;
|
|
|
|
if (buf && len)
|
|
{
|
|
/* mark an existing buffer, but allow allocation of larger string */
|
|
f._flags = __SWR | __SSTR | __SOPT;
|
|
}
|
|
else
|
|
{
|
|
/* mark a zero-length reallocatable buffer */
|
|
f._flags = __SWR | __SSTR | __SMBF;
|
|
len = 0;
|
|
buf = NULL;
|
|
}
|
|
f._bf._base = f._p = (unsigned char *) buf;
|
|
/* For now, inherit the 32-bit signed limit of FILE._bf._size.
|
|
FIXME - it would be nice to rewrite sys/reent.h to support size_t
|
|
for _size. */
|
|
if (len > INT_MAX)
|
|
{
|
|
ptr->_errno = EOVERFLOW;
|
|
return NULL;
|
|
}
|
|
f._bf._size = f._w = len;
|
|
f._file = -1; /* No file. */
|
|
va_start (ap, fmt);
|
|
ret = _svfprintf_r (ptr, &f, fmt, ap);
|
|
va_end (ap);
|
|
if (ret < 0)
|
|
return NULL;
|
|
*lenp = ret;
|
|
*f._p = '\0';
|
|
return (char *) f._bf._base;
|
|
}
|
|
|
|
#ifdef _NANO_FORMATTED_IO
|
|
char *
|
|
_asniprintf_r (struct _reent *, char *, size_t *, const char *, ...)
|
|
_ATTRIBUTE ((__alias__("_asnprintf_r")));
|
|
#endif
|
|
|
|
#ifndef _REENT_ONLY
|
|
|
|
char *
|
|
asnprintf (char *__restrict buf,
|
|
size_t *__restrict lenp,
|
|
const char *__restrict fmt, ...)
|
|
{
|
|
int ret;
|
|
va_list ap;
|
|
FILE f;
|
|
size_t len = *lenp;
|
|
struct _reent *ptr = _REENT;
|
|
|
|
if (buf && len)
|
|
{
|
|
/* mark an existing buffer, but allow allocation of larger string */
|
|
f._flags = __SWR | __SSTR | __SOPT;
|
|
}
|
|
else
|
|
{
|
|
/* mark a zero-length reallocatable buffer */
|
|
f._flags = __SWR | __SSTR | __SMBF;
|
|
len = 0;
|
|
buf = NULL;
|
|
}
|
|
f._bf._base = f._p = (unsigned char *) buf;
|
|
/* For now, inherit the 32-bit signed limit of FILE._bf._size.
|
|
FIXME - it would be nice to rewrite sys/reent.h to support size_t
|
|
for _size. */
|
|
if (len > INT_MAX)
|
|
{
|
|
ptr->_errno = EOVERFLOW;
|
|
return NULL;
|
|
}
|
|
f._bf._size = f._w = len;
|
|
f._file = -1; /* No file. */
|
|
va_start (ap, fmt);
|
|
ret = _svfprintf_r (ptr, &f, fmt, ap);
|
|
va_end (ap);
|
|
if (ret < 0)
|
|
return NULL;
|
|
*lenp = ret;
|
|
*f._p = '\0';
|
|
return (char *) f._bf._base;
|
|
}
|
|
|
|
#ifdef _NANO_FORMATTED_IO
|
|
char *
|
|
asniprintf (char *, size_t *, const char *, ...)
|
|
_ATTRIBUTE ((__alias__("asnprintf")));
|
|
#endif
|
|
#endif /* ! _REENT_ONLY */
|