87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/*
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* Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
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* All rights reserved.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*/
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#include <sm/gen.h>
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SM_RCSID("@(#)$Id: snprintf.c,v 1.23 2001/09/11 04:04:49 gshapiro Exp $")
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#include <limits.h>
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#include <sm/varargs.h>
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#include <sm/io.h>
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#include "local.h"
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/*
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** SM_SNPRINTF -- format a string to a memory location of restricted size
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**
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** Parameters:
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** str -- memory location to place formatted string
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** n -- size of buffer pointed to by str, capped to
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** a maximum of INT_MAX
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** fmt -- the formatting directives
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** ... -- the data to satisfy the formatting
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**
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** Returns:
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** Failure: -1
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** Success: number of bytes that would have been written
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** to str, not including the trailing '\0',
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** up to a maximum of INT_MAX, as if there was
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** no buffer size limitation. If the result >= n
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** then the output was truncated.
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**
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** Side Effects:
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** If n > 0, then between 0 and n-1 bytes of formatted output
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** are written into 'str', followed by a '\0'.
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*/
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int
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#if SM_VA_STD
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sm_snprintf(char *str, size_t n, char const *fmt, ...)
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#else /* SM_VA_STD */
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sm_snprintf(str, n, fmt, va_alist)
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char *str;
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size_t n;
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char *fmt;
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va_dcl
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#endif /* SM_VA_STD */
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{
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int ret;
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SM_VA_LOCAL_DECL
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SM_FILE_T fake;
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/* While snprintf(3) specifies size_t stdio uses an int internally */
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if (n > INT_MAX)
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n = INT_MAX;
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SM_VA_START(ap, fmt);
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/* XXX put this into a static? */
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fake.sm_magic = SmFileMagic;
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fake.f_file = -1;
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fake.f_flags = SMWR | SMSTR;
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fake.f_cookie = &fake;
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fake.f_bf.smb_base = fake.f_p = (unsigned char *)str;
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fake.f_bf.smb_size = fake.f_w = n ? n - 1 : 0;
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fake.f_timeout = SM_TIME_FOREVER;
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fake.f_timeoutstate = SM_TIME_BLOCK;
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fake.f_close = NULL;
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fake.f_open = NULL;
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fake.f_read = NULL;
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fake.f_write = NULL;
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fake.f_seek = NULL;
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fake.f_setinfo = fake.f_getinfo = NULL;
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fake.f_type = "sm_snprintf:fake";
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ret = sm_io_vfprintf(&fake, SM_TIME_FOREVER, fmt, ap);
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if (n > 0)
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*fake.f_p = '\0';
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SM_VA_END(ap);
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return ret;
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}
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