C Library - <string.h>


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The string.h header defines one variable type, one macro, and various functions for manipulating arrays of characters.

Library Variables

Following is the variable type defined in the header string.h:

S.N. Variable & Description
1

size_t

This is the unsigned integral type and is the result of the sizeof keyword.

Library Macros

Following is the macro defined in the header string.h:

S.N. Macro & Description
1

NULL

This macro is the value of a null pointer constant.

Library Functions

Following are the functions defined in the header string.h:

S.N. Function & Description
1

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.

2

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.

16

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 corrent locale and places them in the string dest.



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