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/*
* Samba Unix/Linux SMB client library
* Copyright (C) Gregor Beck 2010
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file cbuf.h
* @author Gregor Beck <gb@sernet.de>
* @date Aug 2010
*
* @brief A talloced character buffer.
*
* A cbuf carries a write position and keeps track of its size.
*/
#ifndef __CBUF_H
#define __CBUF_H
struct cbuf;
typedef struct cbuf cbuf;
/**
* Create a new character buffer.
*
* @param talloc_ctx the talloc parent
*
* @return a new cbuf object, NULL on error
*/
cbuf* cbuf_new(const void* talloc_ctx);
/**
* Create a copy of a character buffer.
*
* @param b the cbuf to copy
* @return a new cbuf object, NULL on error
*/
cbuf* cbuf_copy(const cbuf* b);
/**
* Delete a character buffer.
* This invalidates b and free's the memory allocated.
* @warning don't talloc_free b directly, however freeing
* the parent works as expected
* @param b the cbuf to delete
*/
void cbuf_delete(cbuf* b);
/**
* Reset the buffer to initial state.
* Set the write position to the start of buffer, effectivly
* clearing its contents. Doesn't free memory.
*
* @param b the buffer to clear
*
* @return b
*/
cbuf* cbuf_clear(cbuf* b);
/**
* Swap the contents of two buffers in O(1).
*
* @param b1 a character buffer
* @param b2 another character buffer
*/
void cbuf_swap(cbuf* b1, cbuf* b2);
/**
* Swap the contents of a buffer with a talloced string.
*
* @param b a character buffer
* @param ptr a pointer to a talloced string
* @param len size of string, -1 means strlen(*ptr)
*
* @return b
*/
cbuf* cbuf_swapptr(cbuf* b, char** ptr, size_t len);
/**
* Let a character buffer takeover the contents of another.
* This is equivalent to @code
* cbuf_swap(b1, b2);
* cbuf_delete(b2);
* @endcode
* @param b1 the destination
* @param b2 the victim
*
* @return b1
*/
cbuf* cbuf_takeover(cbuf* b1, cbuf* b2);
/**
* Resize a character buffer.
* This may free allocated memory.
*
* @param b the character buffer.
* @param size the new size
*
* @return b, NULL on error
*/
cbuf* cbuf_resize(cbuf* b, size_t size);
/**
* Reserve space in a character buffer.
* Assert there are at least len bytes following the current write position.
*
* @param b a character buffer
* @param len number of bytes to reserve.
*
* @return a pointer to the current write position, NULL on error
*/
char* cbuf_reserve(cbuf* b, size_t len);
/**
* Put a character into the buffer.
*
* @param b a character buffer, may be NULL.
* @param c a character
* @return number of characters written ((b==NULL) ? 0 : 1)
*
* @retval -1 on error
*/
int cbuf_putc(cbuf* b, char c);
/**
* Put a string into the buffer.
*
* @param b a character buffer, may be NULL
* @param str a string
* @param len number of bytes to write, -1 means strlen(str)
*
* @return number of characters written, -1 on error
*/
int cbuf_puts(cbuf* b, const char* str, size_t len);
/* /\** */
/* * Put a string into the buffer, changing case. */
/* * */
/* * @param b a character buffer, may be NULL */
/* * @param str a string */
/* * @param len number of bytes to write, -1 means strlen(str) */
/* * @param c a character specifying case: */
/* * @li 'U' upper case */
/* * @li 'L' lower case */
/* * @li 'T' title case */
/* * @li 'P' preserve case */
/* * @return number of characters written, -1 on error */
/* *\/ */
/* int cbuf_puts_case(cbuf* b, const char* str, size_t len, char c); */
/**
* Put a uint32 into the buffer.
* Write in little endian order.
*
* @param b a character buffer, may be NULL
* @param u an uint32
*
* @return number of characters written, -1 on error
*/
int cbuf_putdw(cbuf* b, uint32_t u);
/**
* Print formatted to a character buffer.
*
* @param b a character buffer
* @param fmt a printf format string
*
* @return number of characters written, negative on error
*/
int cbuf_printf(cbuf* b, const char* fmt, ...) PRINTF_ATTRIBUTE(2,3);
/**
* Get the current write position.
*
* @param b a character buffer.
*
* @return index of the next character to write.
*/
size_t cbuf_getpos(const cbuf* b);
/**
* Set the current write position of a buffer.
* Invalidates the buffer contents from on the new position.
*
* @param b a character buffer
* @param pos a position obtained by cbuf_getpos
*/
void cbuf_setpos(cbuf* b, size_t pos);
/**
* Get the buffer contents
* starting at idx.
* @pre @code idx <= cbuf_getpos(b) @endcode
* @param b a character buffer
* @param idx a position obtained by cbuf_getpos
*
* @return a NUL terminated string
*/
char* cbuf_gets(cbuf* b, size_t idx);
/**
* Print quoted string to stream.
*
* @todo check for ssputc failure
* @see srprs_quoted_string
*
* @param[out] ost outstream
* @param[in] s '\0' terminated string of printable characters.
*
* @return number of bytes written, -1 on error
*/
int cbuf_print_quoted_string(cbuf* ost, const char* s);
/**
* Print quoted string to stream.
* Escapes nonprintable characters.
*
* @todo check for ssputc failure
* @see srprs_quoted
*
* @param[out] ost outstream
* @param[in] s string of bytes
* @param[in] len number of bytes
*
* @return number of bytes written, -1 on error
*/
int cbuf_print_quoted(cbuf* ost, const char* s, size_t len);
#endif /*__CBUF_H*/
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