Example file open, parsing, and manipulation, and saving

FileManipulation.c

//Example opening and parsing a *.txt file
//
//COMPILING: "gcc -g FileManipulation.c -o fm"
//RUNNING: "/.fm abc.txt"

#include "FileManipulation.h"

int main(int argc, char **argv)
{
  //choose some filename and openmode
	char* fileName = "abc.txt";
	char* mode = "r"; //read

	if(argc>=2)
		fileName = argv[1];


	//open a file and read it's contents
	FILE *fp = GetFile( fileName, mode );

	if( fp == NULL ) {
		printf( "An error occured opening file: %s\n", fileName );
		return ERROR;
	}	


	//print contents of the file we have opened
	if( DisplayFileContents(fp) == ERROR)
		printf("An error occured when displaying file: %s\n", fileName);


	return SUCCESS;
}


//open and return a file pointer based on mode
FILE* GetFile(char* fileName, char* mode)
{
	FILE *fp = fopen( fileName, mode );

	return fp;
}

//read and display a file line by line 
int DisplayFileContents(FILE *file)
{
	int bufferSize = 256;
	char* buffer = malloc(sizeof(char)*bufferSize);
	int lineCount=0;	


	while( fscanf(file, "%s", buffer) != EOF )
	{
		printf("%d :: %s\n", lineCount, buffer);
		lineCount++;
		memcpy(buffer, "\0", bufferSize); //clear buffer each parse
	}
	printf("\n"); //formatting

	//clean up
	free(buffer);

	return SUCCESS;
}

FileManipulation.h

//Example opening and parsing a *.txt file


#include <stdlib.h>
#include <stdio.h>
#include <string.h>


//success or error return values
#define SUCCESS 0
#define ERROR -1


//prototypes
FILE* GetFile(char *fileName, char* mode);
int DisplayFileContents(FILE *file);