Thread: File I/O program

Hi ,

This is my first post in the forum. I am reading some data from the file and printing it in certain format on the screen. I guess reading part is fine but printing is somewhat messed up. Its tv guide program. The data file contains channels and the program timings. Following is my program

Code:

#include <stdio.h>

void getprograminfo(char *, char *, char *);
char * getline(FILE *);

int main(int argc, char *argv[])
{
	FILE *fp;
	int channels;
	char channelname[20];
	char *line;
	char *linep;
	int i,a,len;
	char time[50];
	char program[50];
	char line1[1024];
	char line2[2000];
	int tlen,plen;

	if (argc < 2)
	{
		printf(" USAGE: %s <filename>\n",argv[0]);
		exit(0);
	}


	if ((fp=fopen(argv[1],"r")) == NULL)
	{
		printf("can not open the file\n");
		exit(0);
	}

	fscanf(fp,"%d",&channels);

	printf("Total Channels: %d\n",channels);

	while (!feof(fp))
	{
		memset(channelname,'\0',20);
		
		GETCHANNEL:
		linep=getline(fp);

		if (linep!=NULL)
		{
			if ((line=strstr(linep,"=")) != NULL)
			{
				//printf("linep1: %s\n",linep);
				strcpy(channelname,++line);
				printf("channel: %s\n",channelname);
			}
		} else {
			goto GETCHANNEL;
		}

		//printf("linep2: %s\n",linep);
		//printf("Check 1\n");
		memset(line1,'\0',sizeof(line1));
		memset(line2,'\0',sizeof(line2));
		for (i=0;i<5;i++)
		{
			memset(linep,'\0',sizeof(linep));
			memset(time,'\0',sizeof(time));
			memset(program,'\0',sizeof(program));

			if ((linep=getline(fp)) == NULL)
			{
				continue;
			}

			//printf("linep: %s\n",linep);

			getprograminfo(linep,time,program);
			//printf("time: %s ",time);
			//printf("program: %s\n",program);

			if (i == 0)
			{
				sprintf(line1,"Time\t\t%s",time);
				sprintf(line2,"Program\t\t%s",program);
				//printf("tlen: %d plen: %d\n",strlen(line1),strlen(line2));
			} else {
				strcat(line1,"\t");
				strcat(line1,time);
				strcat(line2,"\t");
				strcat(line2,program);
				//printf("tlen: %d plen: %d\n",strlen(line1),strlen(line2));
			}
		}
		printf("%s\n%s\n",line1,line2);
		if (strlen(line1) > strlen(line2))
		{
			len = strlen(line1);
		} else {
			len = strlen(line2);
		}
		for (a=0;a<len;a++)
		{
			printf("-");
		}
		printf("\n");
			
	}

	fclose(fp);

	return 0;

}

void getprograminfo(char *line, char *time, char *program)
{
	int i,j;
	char tword[50];
	char pword[50];
	
	i=j=0;

	while (i<strlen(line))
	{
		if (line[i] == ' ')
		{
			tword[j]='\0';
			strcpy(time,tword);
			i++;
			strcpy(program,line+i);
			j=0;
			return;
		} else {
			tword[j]=line[i];
			i++;
			j++;
		}
	}
}

char * getline(FILE *fp)
{
	static char line[100];
	char ch;
	int i=0;

	memset(line,'\0',sizeof(line));
	
	while ((ch=fgetc(fp))!='\n')
	{
		line[i]=ch;
		i++;
	}
	line[i+1]='\0';
	//printf("line length: %d\n",strlen(line));

	if (strlen(line) == 1)
	{
		return NULL;
	} else {
		return line;
	}
}

Following is the file i am reading from

8
=ABC
18.00 Dr Who: Underworld
18.30 Collectors
19.00 News
19.30 The 7.30 Report
20.00 Catalyst
=Seven
18.00 Seven News
18.30 Today Tonight
19.00 Home and Away
19.30 My Restaurant Rules
20.30 **END

Following is the program output.

[root@linux-outside snoopy]# ./tvguide tc.txt
Total Channels: 8
channel: ABC
Time 18.00 18.30 19.00 19.30 20.00
Program Catalyst Report Underworld
-------------------------------------------------------------------------
channel: Seven
Time 18.00 18.30 19.00 19.30 20.30
Program **ENDstaurant Rules
------------------------------------------------------------------------------

Any guess, what am i doing wrong?

Thanks,