#include "main.h"/*  =============================================================================== 	Author:		Hammer, May 2002, For www.cprogramming.com/cboard/ 	File:		ioUtilities.c 	Contents:	io_GetInt				io_EnterToContinue				io_GetYesNo				io_GetLine				io_WriteAllRecordsToFile				io_WriteRecordToFile				io_LoadAppConfig				io_SaveAppConfig  ===============================================================================*/static FILE *fp;/*  =============================================================================== 	Function: 	ioLoadPhoneBookFromFile    Args: 		Pointer to the node list     Returns: 	Pointer to the node list.    			NULL    Purpose:	Loads the Record structs from the phone book file into the List  ===============================================================================*/struct Node *io_LoadPhoneBookFromFile(struct Node *List){	struct Record	rec, *recptr;	struct Node		*tmpListPtr;	if ((fp = fopen(STR_FILENAME, "rb")) == NULL)	{	/* Failed to open database file */		printf("ERROR: Unable to open phone book file: %s\n", STR_FILENAME);		return(List);	}	if (List)	{	/* List not empty, kill it before we start reloading */		(void)li_Traverse(List, free);		List = li_Destroy(List);	}	while (fread(&rec, sizeof(struct Record), 1, fp) == 1)	{		if ((recptr = malloc(sizeof(struct Record))) == NULL)		{					/* Memory failure, don't do anymore */			perror("malloc");			break;		}		*recptr = rec;		if ((tmpListPtr = li_Insert(List, recptr, rec_Compare)) == NULL)		{			printf("Error performing insert on list.  Item not addded.\n");			free(recptr);	/* throw record away */		}		else		{			List = tmpListPtr;			recptr->ID = gl_HighestID;			recptr->Status = (unsigned char)0;		}	}	(void)fclose(fp);	gl_AppData.DataChanged = FALSE;	return(List);}/*  ===============================================================================    Function: 	io_GetInt    Args:		maximum number for user to choose    Returns: 	Number chosen, or -1 if x or X entered (for menu use)    Notes:		Assumes that 0 will never be a valid option, and will ask    			the user to re-enter.    Purpose:	Get an int from stdin (keyboard).  =============================================================================== */int io_GetInt(int Max){	int		Input, len;	char	buffer[BUFSIZ];	for (;;)	{		if ((len = io_GetLine(buffer, BUFSIZ, stdin)) != 0)		{			if (len == 1 && (buffer[0] == 'x' || buffer[0] == 'X'))			{	/* Allow for xX to be entered, and return -1 */				Input = RC_BAD;				break;			}			if ((Input = atoi(buffer)) != 0)			{				if (Input >= 1 && Input <= Max)				{					break;				}			}		}		printf("Invalid. Try again (1-%d, x to exit)>", Max);	}	return(Input);}/*  ===============================================================================    Function: 	io_EnterToContinue    Args: 		None    Returns: 	None    Purpose:	Simulates the good old DOS PAUSE  =============================================================================== */void io_EnterToContinue(void){	printf("---> Enter To Continue <---");	FLUSH_INPUT;}/*  ===============================================================================    Function: 	io_GetYesNo    Args: 		String containing the prompt to be displayed    Returns: 	TRUE if yY entered, FALSE if nN entered    Purpose:	Get a Y or N from stdin (keyboard)  =============================================================================== */bool_t io_GetYesNo(char *prompt){	int		c;	bool_t	rc;	for (;;)	{		printf("%s", prompt);		c = getchar();		switch (c)		{		case 'y':		case 'Y':			rc = TRUE;			break;		case 'n':		case 'N':			rc = FALSE;			break;		default:			if (c != '\n') FLUSH_INPUT;			continue;		}		break;	}	if (c != '\n') FLUSH_INPUT;	return(rc);}/*  ===============================================================================    Function: 	io_GetLine    Args: 		buffer to place the text    			length of the buffer    			file pointer to read from.    Returns: 	Chars read and placed into buffer    Purpose:	Same as fgets() but does not keep the newline character  =============================================================================== */int io_GetLine(char *buffer, int maxlen, FILE *fp){	int		len = 0, c;	char	*ptr = buffer;	char	*endptr = buffer + maxlen - 1;	if (fp != NULL)	{		while ((c = fgetc(fp)) != EOF)		{			if (c == '\n') break;			*ptr = c;			ptr++;			len++;			if (ptr == endptr) break;		}	}	*ptr = '\0';	return(len);}/*  ===============================================================================    Function: 	io_WriteAllRecordsToFile    Args: 		Pointer to list     Returns: 	Number of items written.    Purpose:	Save all Record structs in the List to a disk file  =============================================================================== */int io_WriteAllRecordsToFile(struct Node *List){	unsigned char	status = ST_DELETED;	if ((fp = fopen(STR_FILENAME, "wb")) == NULL)	{	/* Failed to open database file */		printf("ERROR: Unable to open phone book file: %s\n", STR_FILENAME);		return(0);	}	/* First delete dead records from the list, then write them to disk */	gl_AppData.MainList = li_DeleteNodeAndData(gl_AppData.MainList, &status, rec_CompareStatus);	(void)li_Traverse(List, io_WriteRecordToFile);	(void)fclose(fp);	gl_AppData.DataChanged = FALSE;	return(gl_HighestID);}/*  ===============================================================================    Function: 	io_WriteRecordToFile    Args: 		Pointer to record structure to be written.    Returns: 	Nothing    Purpose:	Sub-function to write a single Record struct to disk  =============================================================================== */void io_WriteRecordToFile(void *ptr){	struct Record	*rec = ptr;	if (rec->Status & ST_DELETED) return;	/* Don't save deleted records */	if (fp == NULL)	{		fprintf(stderr, "ERROR: Attempting to write to unopened file\n");		return;	}	if (fwrite(rec, sizeof(struct Record), 1, fp) != 1) perror("WriteRecordToFile");}/*  ===============================================================================    Function: 	io_LoadAppConfig    Args: 		None    Returns: 	Nothing    Purpose:	Loads the appconfig structure from disk  =============================================================================== */void io_LoadAppConfig(void){	FILE				*myfp;	struct appconfig	tmpcfg;	if ((myfp = fopen(STR_CFG_FILENAME, "rb")) == NULL) return;	if (fread(&tmpcfg, sizeof(struct appconfig), 1, myfp) == 1) gl_AppCfg = tmpcfg;	(void)fclose(myfp);}/*  ===============================================================================    Function: 	io_SaveAppConfig    Args: 		None    Returns: 	Nothing    Purpose:	Saves the appconfig structure to disk  =============================================================================== */void io_SaveAppConfig(void){	FILE	*myfp;	if ((myfp = fopen(STR_CFG_FILENAME, "wb")) == NULL) return;	if (fwrite(&gl_AppCfg, sizeof(struct appconfig), 1, myfp) != 1)		perror (STR_CFG_FILENAME);	(void)fclose(myfp);}