1 /*
2 * Copyright (c) Huawei Technologies Co., Ltd. 2014-2020. All rights reserved.
3 * Licensed under Mulan PSL v2.
4 * You can use this software according to the terms and conditions of the Mulan PSL v2.
5 * You may obtain a copy of Mulan PSL v2 at:
6 * http://license.coscl.org.cn/MulanPSL2
7 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
8 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
9 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
10 * See the Mulan PSL v2 for more details.
11 * Description: vsscanf_s function
12 * Author: lishunda
13 * Create: 2014-02-25
14 */
15
16 #include "secinput.h"
17 #if defined(SECUREC_VXWORKS_PLATFORM) && !SECUREC_IN_KERNEL && \
18 (!defined(SECUREC_SYSAPI4VXWORKS) && !defined(SECUREC_CTYPE_MACRO_ADAPT))
19 #include <ctype.h>
20 #endif
21
22 /*
23 * <NAME>
24 * vsscanf_s
25 *
26 *
27 * <FUNCTION DESCRIPTION>
28 * The vsscanf_s function is equivalent to sscanf_s, with the variable argument list replaced by argList
29 * The vsscanf_s function reads data from buffer into the location given by
30 * each argument. Every argument must be a pointer to a variable with a type
31 * that corresponds to a type specifier in format. The format argument controls
32 * the interpretation of the input fields and has the same form and function
33 * as the format argument for the scanf function.
34 * If copying takes place between strings that overlap, the behavior is undefined.
35 *
36 * <INPUT PARAMETERS>
37 * buffer Stored data
38 * format Format control string, see Format Specifications.
39 * argList pointer to list of arguments
40 *
41 * <OUTPUT PARAMETERS>
42 * argList the converted value stored in user assigned address
43 *
44 * <RETURN VALUE>
45 * Each of these functions returns the number of fields successfully converted
46 * and assigned; the return value does not include fields that were read but
47 * not assigned. A return value of 0 indicates that no fields were assigned.
48 * return -1 if an error occurs.
49 */
vsscanf_s(const char * buffer,const char * format,va_list argList)50 int vsscanf_s(const char *buffer, const char *format, va_list argList)
51 {
52 size_t count; /* If initialization causes e838 */
53 int retVal;
54 SecFileStream fStr;
55
56 /* Validation section */
57 if (buffer == NULL || format == NULL) {
58 SECUREC_ERROR_INVALID_PARAMTER("vsscanf_s");
59 return SECUREC_SCANF_EINVAL;
60 }
61 count = strlen(buffer);
62 if (count == 0 || count > SECUREC_STRING_MAX_LEN) {
63 SecClearDestBuf(buffer, format, argList);
64 SECUREC_ERROR_INVALID_PARAMTER("vsscanf_s");
65 return SECUREC_SCANF_EINVAL;
66 }
67 #if defined(SECUREC_VXWORKS_PLATFORM) && !SECUREC_IN_KERNEL
68 /*
69 * On vxworks platform when buffer is white string, will set first %s argument tu zero.like following useage:
70 * " \v\f\t\r\n", "%s", str, strSize
71 * Do not check all character, just first and last character then consider it is white string
72 */
73 if (isspace((int)(unsigned char)buffer[0]) != 0 && isspace((int)(unsigned char)buffer[count - 1]) != 0) {
74 SecClearDestBuf(buffer, format, argList);
75 }
76 #endif
77 SECUREC_FILE_STREAM_FROM_STRING(&fStr, buffer, count);
78 retVal = SecInputS(&fStr, format, argList);
79 if (retVal < 0) {
80 SECUREC_ERROR_INVALID_PARAMTER("vsscanf_s");
81 return SECUREC_SCANF_EINVAL;
82 }
83 return retVal;
84 }
85 #if SECUREC_IN_KERNEL
86 EXPORT_SYMBOL(vsscanf_s);
87 #endif
88
89