tbuffer.c

Software Development in C: A Practical Approach to Programming and Design 软件开发：编程与设计（C））——国外经典教材·计

//---------------------------------------------------------
/*
File name:	Tbuffer.h
Comments:	This file contains the implementation of the 
			text_buffer type.
*/


//---------------------------------------------------------
// Include files.

#include "Tbuffer.h"
#include <stdlib.h>

// End include files.
//---------------------------------------------------------


//---------------------------------------------------------
// Macros

// This macro has a problem.
#define SelectValue3(conditionValue,					\
					 selectionValue1,					\
					 response1,							\
					 selectionValue2,					\
					 response2,							\
					 selectionValue3,					\
					 response3)							\
			(conditionValue == selectionValue1) ?		\
				response1 :								\
				(conditionValue == selectionValue2) ?	\
					response2 : response3

// End macros
//---------------------------------------------------------



text_buffer_error TextBufferSetRow(text_buffer buffer,
								   int row,
								   text_string theString)
{
	text_buffer_error errorStatus = TBE_NO_ERROR;

	// If the row number is out of range...
	if ((row<0) || (row>=TEXT_BUFFER_LENGTH))
	{
		// Set an error
	}
	else
	{
		// Set the row to the specified string.
	}

	return (errorStatus);
}



void TextBufferGetRow(text_buffer buffer,
					  int row,
					  text_string theString)
{
	int i;

	// If the row number is in range...
	if ((row>=0) && (row<TEXT_BUFFER_LENGTH))
	{
		// Copy the characters in the row
		for (i=0;buffer[row][i]!='\0';i++)
		{
			theString[i] = buffer[row][i];
		}
		theString[i]='\0';
	}
}



text_buffer_error TextBufferSetCharacter(text_buffer buffer,
										 int row,int column,
										 char theCharacter)
{
	text_buffer_error errorStatus = TBE_NO_ERROR;
	text_string_error stringError;

	// If the row or column number is out of range...
	if ((row<0) || (row>=TEXT_BUFFER_LENGTH) ||
		(column<0) || (column>=TEXT_STRING_MAX_LENGTH))
	{
		// Set an error.
		errorStatus = TBE_INDEX_OUT_OF_RANGE;
	}
	else
	{
		 stringError = TextStringSetCharacter(buffer[row],
											  theCharacter,
											  column);
		// If the character not could be set...
		if (stringError!= TSE_NO_ERROR)
		{
			errorStatus = 
				SelectValue3(stringError,
							 TSE_INVALID_CHARACTER,
							 TBE_INVALID_CHARACTER,
							 TSE_INDEX_AFTER_END_OF_STRING,
							 TBE_INDEX_OUT_OF_RANGE,
							 TSE_INDEX_OUT_OF_RANGE,
							 TBE_INDEX_OUT_OF_RANGE);
		}
	}

	return (errorStatus);
}



int TextBufferGetCharacter(text_buffer buffer,
						   int row,int column)
{
	int theCharacter = -1;

	// If the row and column numbers are in range...
		// Get the character

	return (theCharacter);
}