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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2017 Mike Becker, 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.
 */

/**
 * @file utils.h
 * 
 * Compare, copy and printf functions.
 * 
 * @author Mike Becker
 * @author Olaf Wintermann
 */

#ifndef UCX_UTILS_H
#define UCX_UTILS_H

#include "ucx.h"
#include "string.h"
#include "allocator.h"
#include <inttypes.h>
#include <string.h>
#include <stdarg.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * Default buffer size for ucx_stream_copy() and ucx_stream_ncopy().
 */
#define UCX_STREAM_COPY_BUFSIZE 4096

/**
 * Copies a string.
 * @param s the string to copy
 * @param data omitted
 * @return a pointer to a copy of s1 that can be passed to free(void*)
 */
void *ucx_strcpy(const void *s, void *data);

/**
 * Copies a memory area.
 * @param m a pointer to the memory area
 * @param n a pointer to the size_t containing the size of the memory area
 * @return a pointer to a copy of the specified memory area that can
 * be passed to free(void*)
 */
void *ucx_memcpy(const void *m, void *n);


/**
 * Reads data from a stream and writes it to another stream.
 * 
 * @param src the source stream
 * @param dest the destination stream
 * @param rfnc the read function
 * @param wfnc the write function
 * @param buf a pointer to the copy buffer or <code>NULL</code> if a buffer
 * shall be implicitly created on the heap
 * @param bufsize the size of the copy buffer - if <code>NULL</code> was
 * provided for <code>buf</code>, this is the size of the buffer that shall be
 * implicitly created
 * @param n the maximum number of bytes that shall be copied
 * @return the total number of bytes copied
  */
size_t ucx_stream_bncopy(void *src, void *dest, read_func rfnc, write_func wfnc,
        char* buf, size_t bufsize, size_t n);

/**
 * Shorthand for an unbounded ucx_stream_bncopy call using a default buffer.
 * 
 * @param src the source stream
 * @param dest the destination stream
 * @param rfnc the read function
 * @param wfnc the write function
 * @return total number of bytes copied
 * 
 * @see #UCX_STREAM_COPY_BUFSIZE
 */
#define ucx_stream_copy(src,dest,rfnc,wfnc) ucx_stream_bncopy(\
        src, dest, (read_func)rfnc, (write_func)wfnc, \
        NULL, UCX_STREAM_COPY_BUFSIZE, (size_t)-1)

/**
 * Shorthand for ucx_stream_bncopy using a default copy buffer.
 * 
 * @param src the source stream
 * @param dest the destination stream
 * @param rfnc the read function
 * @param wfnc the write function
 * @param n maximum number of bytes that shall be copied
 * @return total number of bytes copied
 */
#define ucx_stream_ncopy(src,dest,rfnc,wfnc, n) ucx_stream_bncopy(\
        src, dest, (read_func)rfnc, (write_func)wfnc, \
        NULL, UCX_STREAM_COPY_BUFSIZE, n)

/**
 * Shorthand for an unbounded ucx_stream_bncopy call using the specified buffer.
 * 
 * @param src the source stream
 * @param dest the destination stream
 * @param rfnc the read function
 * @param wfnc the write function
 * @param buf a pointer to the copy buffer or <code>NULL</code> if a buffer
 * shall be implicitly created on the heap
 * @param bufsize the size of the copy buffer - if <code>NULL</code> was
 * provided for <code>buf</code>, this is the size of the buffer that shall be
 * implicitly created
 * @return total number of bytes copied
 */
#define ucx_stream_bcopy(src,dest,rfnc,wfnc, buf, bufsize) ucx_stream_bncopy(\
        src, dest, (read_func)rfnc, (write_func)wfnc, \
        buf, bufsize, (size_t)-1)

/**
 * Wraps the strcmp function.
 * @param s1 string one
 * @param s2 string two
 * @param data omitted
 * @return the result of strcmp(s1, s2)
 */
int ucx_cmp_str(const void *s1, const void *s2, void *data);

/**
 * Wraps the strncmp function.
 * @param s1 string one
 * @param s2 string two
 * @param n a pointer to the size_t containing the third strncmp parameter
 * @return the result of strncmp(s1, s2, *n)
 */
int ucx_cmp_strn(const void *s1, const void *s2, void *n);

/**
 * Wraps the sstrcmp function.
 * @param s1 sstr one
 * @param s2 sstr two
 * @param data ignored
 * @return the result of sstrcmp(s1, s2)
 */
int ucx_cmp_sstr(const void *s1, const void *s2, void *data);

/**
 * Compares two integers of type int.
 * @param i1 pointer to integer one
 * @param i2 pointer to integer two
 * @param data omitted
 * @return -1, if *i1 is less than *i2, 0 if both are equal,
 * 1 if *i1 is greater than *i2
 */
int ucx_cmp_int(const void *i1, const void *i2, void *data);

/**
 * Compares two integers of type long int.
 * @param i1 pointer to long integer one
 * @param i2 pointer to long integer two
 * @param data omitted
 * @return -1, if *i1 is less than *i2, 0 if both are equal,
 * 1 if *i1 is greater than *i2
 */
int ucx_cmp_longint(const void *i1, const void *i2, void *data);


/**
 * Distance function for integers of type int.
 * @param i1 pointer to integer one
 * @param i2 pointer to integer two
 * @param data omitted
 * @return i1 minus i2
 */
intmax_t ucx_dist_int(const void *i1, const void *i2, void *data);

/**
 * Distance function for integers of type long int.
 * @param i1 pointer to long integer one
 * @param i2 pointer to long integer two
 * @param data omitted
 * @return i1 minus i2
 */
intmax_t ucx_dist_longint(const void *i1, const void *i2, void *data);

/**
 * Compares two real numbers of type float.
 * @param f1 pointer to float one
 * @param f2 pointer to float two
 * @param data if provided: a pointer to precision (default: 1e-6f)
 * @return -1, if *f1 is less than *f2, 0 if both are equal,
 * 1 if *f1 is greater than *f2
 */

int ucx_cmp_float(const void *f1, const void *f2, void *data);

/**
 * Compares two real numbers of type double.
 * @param d1 pointer to double one
 * @param d2 pointer to double two
 * @param data if provided: a pointer to precision (default: 1e-14)
 * @return -1, if *d1 is less than *d2, 0 if both are equal,
 * 1 if *d1 is greater than *d2
 */
int ucx_cmp_double(const void *d1, const void *d2, void *data);

/**
 * Compares two pointers.
 * @param ptr1 pointer one
 * @param ptr2 pointer two
 * @param data omitted
 * @return -1 if ptr1 is less than ptr2, 0 if both are equal,
 * 1 if ptr1 is greater than ptr2
 */
int ucx_cmp_ptr(const void *ptr1, const void *ptr2, void *data);

/**
 * Compares two memory areas.
 * @param ptr1 pointer one
 * @param ptr2 pointer two
 * @param n a pointer to the size_t containing the third parameter for memcmp
 * @return the result of memcmp(ptr1, ptr2, *n)
 */
int ucx_cmp_mem(const void *ptr1, const void *ptr2, void *n);

/**
 * A <code>printf()</code> like function which writes the output to a stream by
 * using a write_func().
 * @param stream the stream the data is written to
 * @param wfc the write function
 * @param fmt format string
 * @param ... additional arguments
 * @return the total number of bytes written
 */
int ucx_fprintf(void *stream, write_func wfc, const char *fmt, ...);

/**
 * <code>va_list</code> version of ucx_fprintf().
 * @param stream the stream the data is written to
 * @param wfc the write function
 * @param fmt format string
 * @param ap argument list
 * @return the total number of bytes written
 * @see ucx_fprintf()
 */
int ucx_vfprintf(void *stream, write_func wfc, const char *fmt, va_list ap);

/**
 * A <code>printf()</code> like function which allocates space for a sstr_t
 * the result is written to.
 * 
 * <b>Attention</b>: The sstr_t data is allocated with the allocators
 * ucx_allocator_malloc() function. So it is implementation dependent, if
 * the returned sstr_t.ptr pointer must be passed to the allocators
 * ucx_allocator_free() function manually.
 * 
 * <b>Note</b>: The sstr_t.ptr of the return value will <i>always</i> be
 * <code>NULL</code>-terminated.
 * 
 * @param allocator the UcxAllocator used for allocating the result sstr_t
 * @param fmt format string
 * @param ... additional arguments
 * @return a sstr_t containing the formatted string
 */
sstr_t ucx_asprintf(UcxAllocator *allocator, const char *fmt, ...);

/**
 * <code>va_list</code> version of ucx_asprintf().
 * 
 * @param allocator the UcxAllocator used for allocating the result sstr_t
 * @param fmt format string
 * @param ap argument list
 * @return a sstr_t containing the formatted string
 * @see ucx_asprintf()
 */
sstr_t ucx_vasprintf(UcxAllocator *allocator, const char *fmt, va_list ap);

/** Shortcut for ucx_asprintf() with default allocator. */
#define ucx_sprintf(...) \
    ucx_asprintf(ucx_default_allocator(), __VA_ARGS__)

/**
 * A <code>printf()</code> like function which writes the output to a
 * UcxBuffer.
 * 
 * @param buffer the buffer the data is written to
 * @param ... format string and additional arguments
 * @return the total number of bytes written
 * @see ucx_fprintf()
 */
#define ucx_bprintf(buffer, ...) ucx_fprintf((UcxBuffer*)buffer, \
        (write_func)ucx_buffer_write, __VA_ARGS__)

#ifdef __cplusplus
}
#endif

#endif /* UCX_UTILS_H */