Trim trailing whitespace

Giovanny Gongora

Whitespace is defined by isspace(). Returns s, modified to be terminated at the start of its trailing whitespace.

#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>

char *
rtrim(char *s) {
	char *p = s + strlen(s) - 1;
	while (p >= s && isspace((unsigned char) *p)) {
		*p = '\0';
		p--;
	}
	return s;
}