Echelon Neuron C - Manual (Page 158)

138 Functions
strchr( ) Function
The strchr( ) function searches the string s for the first occurrence of the
character c . If the string does not contain c , the strchr( ) function returns the
null pointer. The NUL character terminator ('\0') is considered to be part of the
string, thus strchr(s,'\0') returns a pointer to the NUL terminator. See also
strcat( ), strcmp( ), strcpy( ), strlen( ), strncat( ), strncmp( ), strncpy( ), and
strrchr( ).
Syntax
#include <string.h>
char *strchr (const char * s , char c );
Example
#include <string.h>
void f(void)
{
char
buf[20];
char *p;
strcpy(buf, "Hello World");
p = strchr(buf, 'o'); // Assigns &(buf[4]) to p
p = strchr(buf, '\0'); // Assigns &(buf[11]) to p
p = strchr(buf, 'x'); // Assigns NULL to p
}
strcmp( ) Function
The strcmp( ) function compares the contents of the s1 and s2 strings, up to the
NUL terminator character in the shorter string. The function performs a case-
sensitive comparison. If the strings match identically, 0 is returned. When a
mismatch occurs, the characters from both strings at the mismatch are
compared. If the first string’s character is greater using an unsigned comparison,
the return value is positive. If the second string's character is greater, the return
value is negative.
The terminating NUL ('\0') character is compared just as any other character.
See also strcat( ), strchr( ), strcpy( ), strlen( ), strncat( ), strncmp( ), strncpy( ),
and strrchr( ).
Syntax
#include <string.h>
int strcmp (const unsigned char * s1 , const unsigned char * s2 );
Example
#include <string.h>
void f(void)