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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2011 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdlib.h>
#include <string.h>
#include <stdarg.h>

#include "sstring.h"

sstr_t sstr (char *s) {
    sstr_t string;
    if(s == NULL) {
        string.length = 0;
        string.ptr = NULL;
    } else {
        string.ptr = s;
        string.length = strlen(s);
    }
    return string;
}

sstr_t sstrn (char *s, size_t n) {
    sstr_t string;
    string.ptr = s;
    string.length = n;
    return string;
}

size_t sstrnlen (size_t n, sstr_t s, ...) {
    va_list ap;
    size_t size = s.length;
    va_start(ap, s);

    for (int i=0;i<n-1;i++) {
        sstr_t str = va_arg(ap, sstr_t);
        size += str.length;
    }

    return size;
}

sstr_t sstrcat (sstr_t s, ...) {
    va_list ap;
    va_start(ap, s);
    s.ptr[0] = 0;

    sstr_t str = va_arg (ap, sstr_t);
    while (str.ptr != NULL) {
        s.ptr = strncat (s.ptr, str.ptr, s.length);
        str = va_arg (ap, sstr_t);
    }
    
    return s;
}

sstr_t sstrncat (size_t n, sstr_t s, sstr_t c1, ...) {
    va_list ap;
    va_start(ap, c1);
    s.ptr[0] = 0;

    s.ptr = strncat (s.ptr, c1.ptr, s.length);
    for (int i=0;i<n-1;i++) {
        sstr_t str = va_arg (ap, sstr_t);
        s.ptr = strncat (s.ptr, str.ptr, s.length);
    }

    return s;
}

sstr_t sstrsubs (sstr_t s, size_t start) {
    return sstrsubsl (s, start, s.length-start);
}

sstr_t sstrsubsl (sstr_t s, size_t start, size_t length) {
    sstr_t new_sstr;
    if (start < 0 || start >= s.length || length < 0) {
        return s;
    }
    if (length > s.length-start) {
        length = s.length-start;
    }
    new_sstr.ptr = &s.ptr[start];
    new_sstr.length = length;
    return new_sstr;
}

int sstrcmp(sstr_t s1, sstr_t s2) {
    return strncmp(s1.ptr, s2.ptr, s1.length>s2.length ? s2.length: s1.length);
}

sstr_t sstrdub(sstr_t s) {
    sstr_t newstring;
    newstring.ptr = malloc(s.length + 1);
    newstring.length = s.length;
    newstring.ptr[newstring.length] = 0;

    memcpy(newstring.ptr, s.ptr, s.length);

    return newstring;
}