c code text not displayed - c

Question

iv'e written a part of a code which basically transfers text from a txt file into a variable and prints it(as a part of a program),yet it does not print the contents at all.
#include <stdio.h>
#include <stdlib.h>
#define WRONG_ARGUMENTS (-1)
int Lines(FILE * file);
int Length(FILE * file);
int Read(FILE * file);
int Lines(FILE * file)
{
int c=0,count=0;
++count;
while(c!=EOF)
{
c=fgetc(file);
if(c=='\n')
++count;
}
return count;
}
int Length(FILE * file)
{
int c,count=0;
while((c=fgetc(file))!=EOF)
{
++count;
}
return count;
}
int Reader(FILE * Text,char * File)
{
int counter=0;
while(fscanf(Text,"%s",File)!=EOF)
{
++counter;
strcat(File," ");
}
return counter;
}
int main(int argc,char * argv[]) {
FILE * Text=NULL;
if(argc!=2)
{
printf("usage:library text dictionary\n");
return -1;
}
Text = fopen(argv[1],"r");
if(Text==NULL)
{
printf("file %s could not be opened\n",argv[1]);
return -1;
}
char * File = "";
File=malloc(Length(Text)*(sizeof(char)));
int r = Reader(Text,File);
printf(File);
return 0;
}
i will be more than glad to understand the problem in the partial code
the output is x>
thanks,

Answer 1

Consider the following cut-down example. You'll notice that the getFileLength function (a) doesn't actually read anything from the file and (b) makes use of the fseek and ftell functions - fseek is the function that you use to reposition the file-pointer when it reaches EOF.
Imagine that you weren't printing the data, but doing something else with it. What if the file is a billion bytes long? We sure don't want to read 1,000,000,000 times from it just to determine its length!
As for the use of calloc - it zero initializes the data it allocates. Since you're reading text, you want to ensure that the text is NULL-terminated. (NULL generally = 0, though I've seen evil macros that change this) This NULL terminator is also why I allocate 1 byte more than the file contains.
#include <stdio.h>
#include <stdlib.h>
long getFileLength(FILE *input)
{
long result;
long origPos = ftell(input);
fseek(input, 0, SEEK_END);
result = ftell(input);
fseek(input, origPos, SEEK_SET);
return result;
}
int main (void)
{
FILE *fp;
long fileLen, numBytesRead;
char *data;
fp = fopen("main.cpp", "rb");
fileLen = getFileLength(fp);
data = (char*)calloc(sizeof(char), fileLen+1);
numBytesRead = fread(data, sizeof(char), fileLen, fp);
if (numBytesRead != fileLen)
printf("Error reading all bytes from file. Expected: %d, Read %d\n", fileLen, numBytesRead);
else
printf("%s", data);
free(data);
fclose(fp);
}