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C library function

  1. Memchr

     void *memchr(const void *str, int c, size_t n)
    

Searches for the first occurrence of the character c (an unsigned char) in the first n bytes of the string pointed to, by the argument str.

  1. memcmp

     int memcmp(const void *str1, const void *str2, size_t n)
    

Compares the first n bytes of str1 and str2.

3 void *memcpy(void *dest, const void *src, size_t n) Copies n characters from src to dest.

4 void *memmove(void *dest, const void *src, size_t n) Another function to copy n characters from str2 to str1.

5 void *memset(void *str, int c, size_t n) Copies the character c (an unsigned char) to the first n characters of the string pointed to, by the argument str.

6 char *strcat(char *dest, const char *src) Appends the string pointed to, by src to the end of the string pointed to by dest.

7 char *strncat(char *dest, const char *src, size_t n) Appends the string pointed to, by src to the end of the string pointed to, by dest up to n characters long.

8 char *strchr(const char *str, int c) Searches for the first occurrence of the character c (an unsigned char) in the string pointed to, by the argument str.

9 int strcmp(const char *str1, const char *str2) Compares the string pointed to, by str1 to the string pointed to by str2.

10 int strncmp(const char *str1, const char *str2, size_t n) Compares at most the first n bytes of str1 and str2.

11 int strcoll(const char *str1, const char *str2) Compares string str1 to str2. The result is dependent on the LC_COLLATE setting of the location.

12 char *strcpy(char *dest, const char *src) Copies the string pointed to, by src to dest.

13 char *strncpy(char *dest, const char *src, size_t n) Copies up to n characters from the string pointed to, by src to dest.

14 size_t strcspn(const char *str1, const char *str2) Calculates the length of the initial segment of str1 which consists entirely of characters not in str2.

15 char *strerror(int errnum) Searches an internal array for the error number errnum and returns a pointer to an error message string.

  1. strlen

    size_t strlen(const char *str)
    

Computes the length of the string str up to but not including the terminating null character.

17 char *strpbrk(const char *str1, const char *str2) Finds the first character in the string str1 that matches any character specified in str2.

18 char *strrchr(const char *str, int c) Searches for the last occurrence of the character c (an unsigned char) in the string pointed to by the argument str.

19 size_t strspn(const char *str1, const char *str2) Calculates the length of the initial segment of str1 which consists entirely of characters in str2.

20 char *strstr(const char *haystack, const char *needle) Finds the first occurrence of the entire string needle (not including the terminating null character) which appears in the string haystack.

21 char *strtok(char *str, const char *delim) Breaks string str into a series of tokens separated by delim.

22 size_t strxfrm(char *dest, const char *src, size_t n) Transforms the first n characters of the string src into current locale and places them in the string dest.