/*
 * Copyright (c) 2008, Natacha Porté
 * Copyright (c) 2011, Vicent Martí
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef BUFFER_H__
#define BUFFER_H__

#include <stddef.h>
#include <stdarg.h>
#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

#if defined(_MSC_VER)
#define __attribute__( x )
#endif

typedef enum
{
    BUF_OK = 0,
    BUF_ENOMEM = -1,
} buferror_t;

/* struct buf: character array buffer */
struct buf
{
    uint8_t*    data;   /* actual character data */
    size_t      size;   /* size of the string */
    size_t      asize;  /* allocated size (0 = volatile buffer) */
    size_t      unit;   /* reallocation unit size (0 = read-only buffer) */
};

/* CONST_BUF: global buffer from a string litteral */
#define BUF_STATIC( string ) \
    { (uint8_t*) string, sizeof string - 1, sizeof string, 0, 0 }

/* VOLATILE_BUF: macro for creating a volatile buffer on the stack */
#define BUF_VOLATILE( strname ) \
    { (uint8_t*) strname, strlen( strname ), 0, 0, 0 }

/* BUFPUTSL: optimized bufputs of a string litteral */
#define BUFPUTSL( output, literal ) \
    bufput( output, literal, sizeof literal - 1 )

/* bufgrow: increasing the allocated size to the given value */
int bufgrow( struct buf*, size_t );

/* bufnew: allocation of a new buffer */
struct buf* bufnew( size_t ) __attribute__ ( (malloc) );

/* bufnullterm: NUL-termination of the string array (making a C-string) */
const char* bufcstr( struct buf* );

/* bufprefix: compare the beginning of a buffer with a string */
int bufprefix( const struct buf* buf, const char* prefix );

/* bufput: appends raw data to a buffer */
void bufput( struct buf*, const void*, size_t );

/* bufputs: appends a NUL-terminated string to a buffer */
void bufputs( struct buf*, const char* );

/* bufputc: appends a single char to a buffer */
void bufputc( struct buf*, int );

/* bufrelease: decrease the reference count and free the buffer if needed */
void bufrelease( struct buf* );

/* bufreset: frees internal data of the buffer */
void bufreset( struct buf* );

/* bufslurp: removes a given number of bytes from the head of the array */
void bufslurp( struct buf*, size_t );

/* bufprintf: formatted printing to a buffer */
void bufprintf( struct buf*, const char*, ... ) __attribute__ ( ( format( printf, 2, 3 ) ) );

#ifdef __cplusplus
}
#endif

#endif