Update bbox_lib.cpp

src/gausskernel/cbb/bbox/bbox_lib.cpp

@@ -157,8 +157,16 @@ s32 bbox_strnlen(const char* pszString, s32 count)
 }
 
 /*
- * convert a string to interger
- */
+function name: bbox_atoi
+description: Convert a string that includes continuous digital characters to an integer,
+					if the first character of the string is '-', then we will return a negative result.
+arguments: An pointer that indicates the address of a string.
+return value: Type s32, an integer indicating the result of string converted.
+note: I think the function isn't perfect, though it's not a core function. For example, what about
+		 the condition that the first character of the string is '+'?
+date: 2022/8/2
+contact tel:same
+*/
 s32 bbox_atoi(const char* pszString)
 {
     s32 n = 0;
@@ -178,10 +186,18 @@ s32 bbox_atoi(const char* pszString)
 
     return iNeg ? -n : n;
 }
-
 /*
- * compare memory
- */
+function name: bbox_memcmp
+description: Compare former count bytes in ASCII of data stored in two areas that pointers cs and ct direct.  
+arguments: Two pointers to areas of memory, and an integer indicating the max counts compared.
+return value: Type s32, an integer.
+					 If the value returned is 0, then the data stored in two areas destined are same,
+                     else if is 1, then between two first data in ASCII of byte different, cs's is greater,
+                     else if is -1, then ct's is greater.
+note: The two pointers should not be null, it's dangerous.
+date: 2022/8/2
+contact tel: same
+*/
 s32 bbox_memcmp(const void* cs, const void* ct, s32 count)
 {
     const unsigned char *su1 = NULL;
@@ -197,8 +213,18 @@ s32 bbox_memcmp(const void* cs, const void* ct, s32 count)
 }
 
 /*
- * search string l2 in l1
- */
+function name: bbox_strstr
+description: Judge if the string s2 directs is substring of string s1 directs.
+arguments: Two pointers of type const char*, pointing to two strings.
+return value: Type char*, a pointer. Actually it's a address, if s2 directs a 
+					 null string, then return the address of the first character of s1,
+                     if the string s2 directs isn't substring of string s1 directs, return 
+                     null, if the string s2 directs is substring of string s1 directs, then return
+                     the address of first character matched.
+note: The two pointers should not be null, it's dangerous.
+date: 2022/8/2
+contact tel: same
+*/
 char* bbox_strstr(const char* s1, const char* s2)
 {
     int l1, l2;