Manual

140 Functions
Syntax
#include <string.h>
unsigned long strlen (const char *
s );
Example
#include <string.h>
void f(void)
{
unsigned long length;
length = strlen("Hello, world!");
}
strncat( ) Function
The strncat( ) function appends a copy of the first len characters from the string
src to the end of the string dest , and then adds a NUL ('\0') character, resulting
in concatenated strings (thus the name strncat, from string concatenate). If the
src string is shorter than len , no characters are copied past the NUL character.
The function returns a pointer to the string
dest . See also strcat( ), strchr( ),
strcmp( ), strcpy( ), strlen( ), strncmp( ), strncpy( ), and strrchr( ).
This function cannot be used to copy overlapping areas of memory, or to write
into EEPROM memory or network variables.
Syntax
#include <string.h>
char *strncat (char *
dest , char * src , unsigned long len );
Example
#include <string.h>
void f(void)
{
char buf[40]
strncpy(buf, "Hello Beautiful", 16);
strncat(buf, "World News Tonight", 5);
// buf now contains "Hello Beautiful World"
}
strncmp( ) Function
The strncmp( ) function compares the contents of the s1 and s2 strings, up to the
NUL ('\0') terminator character in the shorter string, or until
len characters have
been compared, whichever occurs first. The function performs a case-sensitive
comparison. If the strings match identically, 0 is returned.