135 lines
4.7 KiB
C
135 lines
4.7 KiB
C
/*
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* Copyright (c) Huawei Technologies Co., Ltd. 2014-2018. All rights reserved.
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* Description: vsnprintf_s function
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* Author: Hisilicon
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* Create: 2014-02-25
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*/
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#include "secureprintoutput.h"
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#if SECUREC_ENABLE_VSNPRINTF
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/*
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* <FUNCTION DESCRIPTION>
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* The vsnprintf_s function is equivalent to the vsnprintf function
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* except for the parameter destMax/count and the explicit runtime-constraints violation
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* The vsnprintf_s function takes a pointer to an argument list, then formats
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* and writes up to count characters of the given data to the memory pointed
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* to by strDest and appends a terminating null.
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*
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* <INPUT PARAMETERS>
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* strDest Storage location for the output.
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* destMax The size of the strDest for output.
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* count Maximum number of character to write(not including
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* the terminating NULL)
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* format Format-control string.
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* argList pointer to list of arguments.
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*
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* <OUTPUT PARAMETERS>
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* strDest is updated
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*
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* <RETURN VALUE>
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* return the number of characters written, not including the terminating null
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* return -1 if an error occurs.
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* return -1 if count < destMax and the output string has been truncated
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*
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* If there is a runtime-constraint violation, strDest[0] will be set to the '\0' when strDest and destMax valid
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*/
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int vsnprintf_s(char *strDest, size_t destMax, size_t count, const char *format, va_list argList)
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{
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int retVal;
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if (SECUREC_VSNPRINTF_PARAM_ERROR(format, strDest, destMax, count, SECUREC_STRING_MAX_LEN)) {
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SECUREC_VSPRINTF_CLEAR_DEST(strDest, destMax, SECUREC_STRING_MAX_LEN);
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SECUREC_ERROR_INVALID_PARAMTER("vsnprintf_s");
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return -1;
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}
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if (destMax > count) {
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retVal = SecVsnprintfImpl(strDest, count + 1, format, argList);
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if (retVal == SECUREC_PRINTF_TRUNCATE) { /* To keep dest buffer not destroyed 2014.2.18 */
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/* The string has been truncated, return -1 */
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return -1; /* To skip error handler, return strlen(strDest) or -1 */
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}
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} else {
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retVal = SecVsnprintfImpl(strDest, destMax, format, argList);
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#ifdef SECUREC_COMPATIBLE_WIN_FORMAT
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if (retVal == SECUREC_PRINTF_TRUNCATE && count == (size_t)(-1)) {
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return -1;
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}
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#endif
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}
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if (retVal < 0) {
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strDest[0] = '\0'; /* Empty the dest strDest */
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if (retVal == SECUREC_PRINTF_TRUNCATE) {
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/* Buffer too small */
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SECUREC_ERROR_INVALID_RANGE("vsnprintf_s");
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}
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SECUREC_ERROR_INVALID_PARAMTER("vsnprintf_s");
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return -1;
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}
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return retVal;
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}
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#if SECUREC_IN_KERNEL
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EXPORT_SYMBOL(vsnprintf_s);
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#endif
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#endif
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#if SECUREC_SNPRINTF_TRUNCATED
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/*
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* <FUNCTION DESCRIPTION>
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* The vsnprintf_truncated_s function is equivalent to the vsnprintf function
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* except for the parameter destMax/count and the explicit runtime-constraints violation
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* The vsnprintf_truncated_s function takes a pointer to an argument list, then formats
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* and writes up to count characters of the given data to the memory pointed
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* to by strDest and appends a terminating null.
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*
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* <INPUT PARAMETERS>
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* strDest Storage location for the output.
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* destMax The size of the strDest for output.
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* the terminating NULL)
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* format Format-control string.
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* argList pointer to list of arguments.
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*
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* <OUTPUT PARAMETERS>
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* strDest is updated
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*
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* <RETURN VALUE>
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* return the number of characters written, not including the terminating null
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* return -1 if an error occurs.
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* return destMax-1 if output string has been truncated
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*
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* If there is a runtime-constraint violation, strDest[0] will be set to the '\0' when strDest and destMax valid
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*/
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int vsnprintf_truncated_s(char *strDest, size_t destMax, const char *format, va_list argList)
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{
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int retVal;
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if (SECUREC_VSPRINTF_PARAM_ERROR(format, strDest, destMax, SECUREC_STRING_MAX_LEN)) {
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SECUREC_VSPRINTF_CLEAR_DEST(strDest, destMax, SECUREC_STRING_MAX_LEN);
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SECUREC_ERROR_INVALID_PARAMTER("vsnprintf_truncated_s");
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return -1;
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}
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retVal = SecVsnprintfImpl(strDest, destMax, format, argList);
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if (retVal < 0) {
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if (retVal == SECUREC_PRINTF_TRUNCATE) {
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return (int)(destMax - 1); /* To skip error handler, return strlen(strDest) */
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}
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strDest[0] = '\0'; /* Empty the dest strDest */
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SECUREC_ERROR_INVALID_PARAMTER("vsnprintf_truncated_s");
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return -1;
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}
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return retVal;
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}
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#if SECUREC_IN_KERNEL
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EXPORT_SYMBOL(vsnprintf_truncated_s);
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#endif
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#endif
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