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Update bbox_lib.cpp

This commit is contained in:
Eao3piq4e 2022-08-02 11:50:12 +08:00
parent 09e299ac8a
commit 0c2af1d742
1 changed files with 42 additions and 12 deletions
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54
src/gausskernel/cbb/bbox/bbox_lib.cpp
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@ -52,14 +52,17 @@ static struct PIPE_IDS astPipeIds[BBOX_MAX_PIDS];
/*
function name: bbox_strncmp
description: compare two strings, the pointer pszSrc and pszTarget store their addresses.
description: To compare two substrings, the pointers pszSrc and pszTarget store their host strings'addresses.
arguments: Two pointers of type const char*, pointing to two strings needed to be compared.
return value: s32, an interger.
If it's zero, then string pszSrc and pszTarget are same,
else it indicates the position of the first character that
these two strings can't match.
note：The two pointers shouldn't be null.
An integer indicates the number of characters at the former of two strings that
will be compared.
return value: Type s32, an interger.
If it's zero, then the former substrings of string pszSrc and pszTarget are same,
else it indicates the difference between the first two characters that these two
strings can't match.
note：The two pointers shouldn't be null. The last argument shouldn't less than zero.
date: 2022/8/2
contact tel: 18720816902
*/
s32 bbox_strncmp(const char* pszSrc, const char* pszTarget, s32 count)
{
@ -76,8 +79,20 @@ s32 bbox_strncmp(const char* pszSrc, const char* pszTarget, s32 count)
}
/*
* compare string pszSrc and pszTarget
*/
function name: bbox_strcmp
description: compare two strings, the pointer pszSrc and pszTarget store their addresses.
arguments: Two pointers of type const char*, pointing to two strings needed to be compared.
An integer indicates the number of characters at the former of two strings that
will be compared.
return value: Type s32, an interger.
If it's zero, then the former substrings of string pszSrc and pszTarget are same,
else if it's 1, then it indicates between first two characters that these two
strings can't match, the character of first string that pszSrc points is greater,
else if it's -1, the character of second string that pszTarget points is greater.
note：The two pointers shouldn't be null. The last argument shouldn't less than zero.
date: 2022/8/2
contact tel:same
*/
s32 bbox_strcmp(const char* pszSrc, const char* pszTarget)
{
unsigned char c1, c2;
@ -98,8 +113,15 @@ s32 bbox_strcmp(const char* pszSrc, const char* pszTarget)
}
/*
* get the length of string pszString
*/
function name: bbox_strlen
description: Calculate the length of string.
arguments: An pointer that indicates the address of a string.
return value: Type s32, an integer indicating the length of string.
note: the length of string=(address of the last character not '\0'-address of the first character)/sizeof(char), and sizeof(char)
equals to 1, so the length of string=(address of the last character not '\0'-address of the first character).
date: 2022/8/2
contact tel:same
*/
s32 bbox_strlen(const char* pszString)
{
const char* pszTemp = NULL;
@ -113,8 +135,16 @@ s32 bbox_strlen(const char* pszString)
}
/*
* get the length of string pszString
*/
function name: bbox_strnlen
description: Calculate the length of string, but having some restrictive conditions.
arguments: An pointer that indicates the address of a string.
And an integer that indicates the maxlenth.
return value: Type s32, an integer indicating the length of string.
note: If the length of string exceed the argument count, then return the length of string,
else return the argument count.
date: 2022/8/2
contact tel:same
*/
s32 bbox_strnlen(const char* pszString, s32 count)
{
const char* pszTemp = NULL;