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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/../cpp/header/../../c/header/string.html below:

Standard library header <string.h> - cppreference.com

This header provides functions for handling null-terminated byte strings.

Macros implementation-defined null pointer constant
(macro constant) [edit] Types unsigned integer type returned by the sizeof operator
(typedef) [edit] Functions String manipulation copies one string to another
(function) [edit] copies a certain amount of characters from one string to another
(function) [edit] concatenates two strings
(function) [edit] concatenates a certain amount of characters of two strings
(function) [edit] transform a string so that strcmp would produce the same result as strcoll
(function) [edit] allocates a copy of a string
(function) [edit] allocates a copy of a string of specified size
(function) [edit] String examination returns the length of a given string
(function) [edit] compares two strings
(function) [edit] compares a certain amount of characters of two strings
(function) [edit] compares two strings in accordance to the current locale
(function) [edit] finds the first occurrence of a character
(function) [edit] finds the last occurrence of a character
(function) [edit] returns the length of the maximum initial segment that consists
of only the characters found in another byte string
(function) [edit] returns the length of the maximum initial segment that consists
of only the characters not found in another byte string
(function) [edit] finds the first location of any character in one string, in another string
(function) [edit] finds the first occurrence of a substring of characters
(function) [edit] finds the next token in a byte string
(function) [edit] Character array manipulation searches an array for the first occurrence of a character
(function) [edit] compares two buffers
(function) [edit] fills a buffer with a character
(function) [edit] copies one buffer to another
(function) [edit] moves one buffer to another
(function) [edit] copies one buffer to another, stopping after the specified delimiter
(function) [edit] Miscellaneous returns a text version of a given error code
(function) [edit] [edit] Synopsis

#define __STDC_VERSION_STRING_H__ 202311L
 
#define NULL /* see description */
 
typedef /* see description */ size_t;
 
void* memcpy(void* restrict s1, const void* restrict s2, size_t n);
void* memccpy(void* restrict s1, const void* restrict s2, int c, size_t n);
void* memmove(void* s1, const void* s2, size_t n);
char* strcpy(char* restrict s1, const char* restrict s2);
char* strncpy(char* restrict s1, const char* restrict s2, size_t n);
char* strdup(const char* s);
char* strndup(const char* s, size_t n);
char* strcat(char* restrict s1, const char* restrict s2);
char* strncat(char* restrict s1, const char* restrict s2, size_t n);
int memcmp(const void* s1, const void* s2, size_t n);
int strcmp(const char* s1, const char* s2);
int strcoll(const char* s1, const char* s2);
int strncmp(const char* s1, const char* s2, size_t n);
size_t strxfrm(char* restrict s1, const char* restrict s2, size_t n);
/*QVoid*/* memchr(/*QVoid*/* s, int c, size_t n);
/*QChar*/* strchr(/*QChar*/* s, int c);
size_t strcspn(const char* s1, const char* s2);
/*QChar*/* strpbrk(/*QChar*/* s1, const char* s2);
/*QChar*/* strrchr(/*QChar*/* s, int c);
size_t strspn(const char* s1, const char* s2);
/*QChar*/* strstr(/*QChar*/* s1, const char* s2);
char* strtok(char* restrict s1, const char* restrict s2);
void* memset(void* s, int c, size_t n);
void* memset_explicit(void* s, int c, size_t n);
char* strerror(int errnum);
size_t strlen(const char* s);
size_t strnlen(const char* s, size_t n);

Only if the implementation defines __STDC_LIB_EXT1__ and additionally the user code defines __STDC_WANT_LIB_EXT1__ before any inclusion of <string.h>:

#ifdef __STDC_WANT_LIB_EXT1__
 
tyepdef /* see description */ errno_t;
tyepdef /* see description */ rsize_t;
 
errno_t memcpy_s(void* restrict s1, rsize_t s1max, const void* restrict s2, rsize_t n);
errno_t memmove_s(void* s1, rsize_t s1max, const void* s2, rsize_t n);
errno_t strcpy_s(char* restrict s1, rsize_t s1max, const char* restrict s2);
errno_t strncpy_s(char* restrict s1, rsize_t s1max, const char* restrict s2, rsize_t n);
errno_t strcat_s(char* restrict s1, rsize_t s1max, const char* restrict s2);
errno_t strncat_s(char* restrict s1, rsize_t s1max, const char* restrict s2, rsize_t n);
char* strtok_s(char* restrict s1, rsize_t* restrict s1max,
               const char* restrict s2, char** restrict ptr);
errno_t memset_s(void* s, rsize_t smax, int c, rsize_t n)
errno_t strerror_s(char* s, rsize_t maxsize, errno_t errnum);
size_t strerrorlen_s(errno_t errnum);
size_t strnlen_s(const char* s, size_t maxsize);
 
#endif

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