A simple function to trim some space off a string in C

trim_space.c

char * trim_space(char *str) {
    char *end;
    /* skip leading whitespace */
    while (isspace(*str)) {
        str = str + 1;
    }
    /* remove trailing whitespace */
    end = str + strlen(str) - 1;
    while (end > str && isspace(*end)) {
        end = end - 1;
    }
    /* write null character */
    *(end+1) = '\0';
    return str;
}