making a text file into a char array

This is a discussion on making a text file into a char array within the C Programming forums, part of the General Programming Boards category; Hi Im writing a program to create a textbuffer. I have finished writing the functions that the interface has specified ...

  1. #1
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    Smile making a text file into a char array

    Hi

    Im writing a program to create a textbuffer. I have finished writing the functions that the interface has specified and I wanted to test the functions.

    I'm however unable to read in the text file in the form of a char array coz my newTB function is suuposed to take in a char array.

    this is my main function where im calling newTB and releaseTB.
    Code:
    #include <stdio.h>
    #include <stdlib.h>
    #include "textbuffer.h"
    #include "textbuffer.c"
    
    int main (int argc, char* argv[]) {
       FILE *f;
       f = fopen("testData.txt","r");
       TB newtestTB = newTB (f); 
       releaseTB(newtestTB);
       assert( newtestTB==NULL);
    	
       return 0;
    }
    and these are my newTN and releaseTB prototypes:
    Code:
    /* Allocate a new textbuffer whose contents is initialised with the text given
     * in the array.
     */
    TB newTB (char text[]);
    
    /* Free the memory occupied by the given textbuffer.  It is an error to access
     * the buffer afterwards.
     */
    void releaseTB (TB tb);

  2. #2
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    Quote Originally Posted by shredderr View Post
    Hi

    Im writing a program to create a textbuffer. I have finished writing the functions that the interface has specified and I wanted to test the functions.

    I'm however unable to read in the text file in the form of a char array coz my newTB function is suuposed to take in a char array.

    this is my main function where im calling newTB and releaseTB.
    [CODE]#include <stdio.h>
    #include <stdlib.h>
    #include "textbuffer.h"
    #include "textbuffer.c"

    int main (int argc, char* argv[]) {
    FILE *f;
    f = fopen("testData.txt","r");
    TB newtestTB = newTB (f);
    [code]
    1) What you are actually doing there is assigning your file pointer (not it's contents) to the newtb function.
    2) TB NewTB is not a valid function name. Function names cannot contain spaces.
    3) Never #include a C file...

    What you need to do in your main() function is this...
    Open your file...
    Discover it's size ... fseek() to the end, use ftell() to get the size.
    Create a char array ... Use calloc() to make it a few characters bigger than the file.
    Reset the file pointer... fseek() to the beginning
    Read the whole file .. Use a single fread() call to grab the whole thing into your array.
    Close the file.
    Do what you gotta do to the array...
    Release the memory... Use free() to release it.

    You probably won't want to do that with self-written functions because all you'd really be doing is reinventing the wheel...

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