sscanf.c revision 182352 
1/*
2 * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
3 *      All rights reserved.
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Chris Torek.
9 *
10 * By using this file, you agree to the terms and conditions set
11 * forth in the LICENSE file which can be found at the top level of
12 * the sendmail distribution.
13 */
14
15#include <sm/gen.h>
16SM_RCSID("@(#)$Id: sscanf.c,v 1.25 2002/02/01 02:28:00 ca Exp $")
17#include <string.h>
18#include <sm/varargs.h>
19#include <sm/io.h>
20#include "local.h"
21
22/*
23**  SM_EOFREAD -- dummy read function for faked file below
24**
25**	Parameters:
26**		fp -- file pointer
27**		buf -- location to place read data
28**		len -- number of bytes to read
29**
30**	Returns:
31**		0 (zero) always
32*/
33
34static ssize_t
35sm_eofread __P((
36	SM_FILE_T *fp,
37	char *buf,
38	size_t len));
39
40/* ARGSUSED0 */
41static ssize_t
42sm_eofread(fp, buf, len)
43	SM_FILE_T *fp;
44	char *buf;
45	size_t len;
46{
47	return 0;
48}
49
50/*
51**  SM_IO_SSCANF -- scan a string to find data units
52**
53**	Parameters:
54**		str -- strings containing data
55**		fmt -- format directive for finding data units
56**		... -- memory locations to place format found data units
57**
58**	Returns:
59**		Failure: SM_IO_EOF
60**		Success: number of data units found
61**
62**	Side Effects:
63**		Attempts to strlen() 'str'; if not a '\0' terminated string
64**			then the call may SEGV/fail.
65**		Faking the string 'str' as a file.
66*/
67
68int
69#if SM_VA_STD
70sm_io_sscanf(const char *str, char const *fmt, ...)
71#else /* SM_VA_STD */
72sm_io_sscanf(str, fmt, va_alist)
73	const char *str;
74	char *fmt;
75	va_dcl
76#endif /* SM_VA_STD */
77{
78	int ret;
79	SM_FILE_T fake;
80	SM_VA_LOCAL_DECL
81
82	fake.sm_magic = SmFileMagic;
83	fake.f_flags = SMRD;
84	fake.f_bf.smb_base = fake.f_p = (unsigned char *) str;
85	fake.f_bf.smb_size = fake.f_r = strlen(str);
86	fake.f_file = -1;
87	fake.f_read = sm_eofread;
88	fake.f_write = NULL;
89	fake.f_close = NULL;
90	fake.f_open = NULL;
91	fake.f_seek = NULL;
92	fake.f_setinfo = fake.f_getinfo = NULL;
93	fake.f_type = "sm_io_sscanf:fake";
94	fake.f_flushfp = NULL;
95	fake.f_ub.smb_base = NULL;
96	fake.f_timeout = SM_TIME_FOREVER;
97	fake.f_timeoutstate = SM_TIME_BLOCK;
98	SM_VA_START(ap, fmt);
99	ret = sm_vfscanf(&fake, SM_TIME_FOREVER, fmt, ap);
100	SM_VA_END(ap);
101	return ret;
102}
103