String manipulation

Names specified for `<string.h>`, “String manipulation”
Name	Description	Notes				Source	Availability
`errno_t`	Error-number type		?		T	Headers					C11
`memchr()`	Search memory				(·)	`<string.h>`	C89	C90	C95	C99	C11
`memcmp()`	Compare memory				(·)	`<string.h>`	C89	C90	C95	C99	C11
`memcpy()`	Copy memory				(·)	`<string.h>`	C89	C90	C95	C99	C11
`memcpy_s()`	Copy memory		?		(·)	`<string.h>`					C11
`memmove()`	Copy overlapping memory				(·)	`<string.h>`	C89	C90	C95	C99	C11
`memmove_s()`	Copy overlapping memory		?		(·)	`<string.h>`					C11
`memset()`	Initialize memory				(·)	`<string.h>`	C89	C90	C95	C99	C11
`NULL`	Null pointer constant	L		M		Headers	C89	C90	C95	C99	C11
`rsize_t`	Implementation-defined size type with implied run-time constraints	L	?		T	Headers					C11
`size_t`	Implementation-defined size type	H			T	Headers	C89	C90	C95	C99	C11
`strcat()`	Catenate strings				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strcat_s()`	Catenate strings		?		(·)	`<string.h>`					C11
`strchr()`	Search string for first occurance of character				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strcmp()`	Compare string				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strcoll()`	Compare string				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strcpy()`	Copy string				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strcpy_s()`	Copy string		?		(·)	`<string.h>`					C11
`strcspn()`	Search string for longest span of complement of set of characters				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strerror()`	Interpret error number				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strerror_s()`	Interpret error number		?		(·)	`<string.h>`					C11
`strerrorlen_s()`	Get length of message interpreting error number		?		(·)	`<string.h>`					C11
`strlen()`	Compute length of string				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strncat()`	Catenate strings				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strncat_s()`	Catenate strings		?		(·)	`<string.h>`					C11
`strncmp()`	Compare string				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strncpy()`	Copy string				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strncpy_s()`	Copy string		?		(·)	`<string.h>`					C11
`strnlen_s()`	Compute length of string		?		(·)	`<string.h>`					C11
`strpbrk()`	Search string for first of set of characters				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strrchr()`	Search string for last occurance of character				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strspn()`	Search string for longest span of set of characters				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strstr()`	Search string for string				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strtok()`	Tokenize string				(·)	`<string.h>`	C89	C90	C95	C99	C11
`strtok_s()`	Tokenize string		?		(·)	`<string.h>`					C11
`strxfrm()`	Transform string				(·)	`<string.h>`	C89	C90	C95	C99	C11

This header is available in C89, C90, C95, C99 and C11.

The header <string.h> declares several functions for: