char* strcpy(char *dst, char *src);
Copy string
char* strncpy(char *dst, char *src, int n);
Copy string
int strcmp(char *lhs, char *rhs);
Compare the given string (Notice: Return 0 indicate same)
int strncmp(char *lhs, char *rhs, int n);
Compare the given string (Notice: Return 0 indicate same)
char* strcat(char *dest, char *src);
Add src to the end of dest (dest += src)
char* index(char *s, int c);
Return the string's substring from character c
char* rindex(char *s, int c);
Return the string's substring from character c
int strlen(char *arg1);
Return the length of string
void* memset(void *arg1, int val, int count);
Set the memory range to val
void* memcpy(void *dst, void *src, int count);
Copy memory
int memcmp(void *lhs, void *rhs, int count);
Compare the given two [memory, memory+count)
char* strchr(char *s, int c);
Searches the string pointed to by the argument str for the first occurrence of the character c (an unsigned character)
size_t strcspn(char *s, char *charset);
Retrieve several consecutive characters at the beginning of the string s that do not contain the characters in the string charset
char* strncat(char *dest, char *src, size_t n);
Appends the string pointed to by src to the end of the string pointed to by dest until n characters long
char* strpbrk(char *s, char *charset);
Retrieves the first character in the string s that matches the characters in the string charset, excluding the null terminator
char* strrchr(char *s, int __c);
Searches the string pointed to by the argument s for the position of the last occurrence of the character __c (an unsigned character)
size_t strspn(char *s, char *charset);
Retrieves the subscript of the first character in the string s that does not appear in the string charset
char* strstr(char *big, char *little);
Find the first occurrence of the string little in the string big, excluding the terminator '\0'
char* strtok(char *str, char *sep);
Decompose the string str into a set of strings, sep is the delimiter
size_t strxfrm(char *dest, char *src, size_t n);
Convert the first n characters of the string src according to LC_COLLATE in the program's current locale options and place them in the string dest
char* strcpy(char *dst, char *src);
复制字符串
char* strncpy(char *dst, char *src, int n);
复制字符串
int strcmp(char *lhs, char *rhs);
计算两个字符串的标准差值（注意：等于0表示字符串一致，而非等于布尔值true）
int strncmp(char *lhs, char *rhs, int n);
计算两个字符串的标准差值（注意：等于0表示字符串一致，而非等于布尔值true）
char* strcat(char *dest, char *src);
把 src 所指向的字符串追加到 dest 所指向的字符串的结尾 (dest += src)
char* index(char *s, int c);
获取字符串s从第一个字符c开始的子串
char* rindex(char *s, int c);
获取字符串s从最后一个字符c开始的子串
int strlen(char *arg1);
获取字符串长度
void* memset(void *arg1, int val, int count);
将一段内存设置为val
void* memcpy(void *dst, void *src, int count);
拷贝内存
int memcmp(void *lhs, void *rhs, int count);
计算两个字符串的标准差值，比较count个长度
char* strchr(char *s, int c);
在参数 str 所指向的字符串中搜索第一次出现字符 c（一个无符号字符）的位置
size_t strcspn(char *s, char *charset);
检索字符串 s 开头连续有几个字符都不含字符串 charset 中的字符
char* strncat(char *dest, char *src, size_t n);
把 src 所指向的字符串追加到 dest 所指向的字符串的结尾，直到 n 字符长度为止
char* strpbrk(char *s, char *charset);
检索字符串 s 中第一个匹配字符串 charset 中字符的字符，不包含空结束字符
char* strrchr(char *s, int __c);
在参数 s 所指向的字符串中搜索最后一次出现字符 __c（一个无符号字符）的位置
size_t strspn(char *s, char *charset);
检索字符串 s 中第一个不在字符串 charset 中出现的字符下标
char* strstr(char *big, char *little);
在字符串 big 中查找第一次出现字符串 little 的位置，不包含终止符 '\0'
char* strtok(char *str, char *sep);
分解字符串 str 为一组字符串，sep 为分隔符
size_t strxfrm(char *dest, char *src, size_t n);
根据程序当前的区域选项中的 LC_COLLATE 来转换字符串 src 的前 n 个字符，并把它们放置在字符串 dest 中