libc.info: index

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`index'--search for character in string

*Synopsis*
     #include <string.h>
     char * index(const char *STRING, int C);
   *Description*
This function finds the first occurence of C (converted to a char) in
the string pointed to by STRING (including the terminating null
character).
   This function is identical to `strchr'.
*Returns*
Returns a pointer to the located character, or a null pointer if C does
not occur in STRING.
*Portability*
`index' requires no supporting OS subroutines.