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[FreeBSD/releng/10.0.git] / contrib / sendmail / libsm / sscanf.c
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>
16 SM_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
34 static ssize_t
35 sm_eofread __P((
36         SM_FILE_T *fp,
37         char *buf,
38         size_t len));
39
40 /* ARGSUSED0 */
41 static ssize_t
42 sm_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
68 int
69 #if SM_VA_STD
70 sm_io_sscanf(const char *str, char const *fmt, ...)
71 #else /* SM_VA_STD */
72 sm_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 }