strsuff.c

Many C samples. It is a good sample for students to learn C language.

/*  File   : strsuff.c
    Author : Richard A. O'Keefe.
    Updated: 11 April 1984
    Defines: strsuff()

    strsuff(src, suffix)
    checks whether suffix is a suffix of src.  If it is not, the  result
    is NullS.  If it is, the result is a pointer to the character of src
    where suffix starts (which is the same as src+strlen(src)-strlen(prefix) ).
    See strpref.c for a comment about using if (strsuff(...)) in C.
*/

#include "strings.h"

char *strsuff(src, suffix)
    register char *src, *suffix;
    {
	register int L;	/* length of suffix */

	for (L = 0; *suffix++; L++)
	    if (!*src++) return NullS;
	while (*src++) ;
	for (--src, --suffix; --L >= 0; )
	    if (*--src != *--suffix) return NullS;
	return src;
    }