How to make a buffer?

[Osoascam]

Hi! I made this code in order to "create" a buffer...
It works perfectly when reading from console, but it just doesn't work for redinf from files.
(Read after the function for the code explanation)
NAME is a class variable, char*

void buffer(FILE* entrada, char separador)     //entrada is input (sdtin for consol)
{
    int numChars = 2;                                //# of characters read
    char* aux;
    buff = (char*)malloc(sizeof(char)*numChars);
    NAME = (char*)malloc(sizeof(char)*numChars);
    aux = (char*)malloc(sizeof(char)*numChars);
    fgets(buff,(numChars),entrada);
    *NAME = '\0';
    do
    {
        aux = (char*)malloc(strlen(NAME)+numChars);
        strcpy(aux, NAME);
        free(NAME);
        NAME = (char*)malloc(strlen(aux)*2+numChars);
        strcpy(NAME, aux);
        strncat(NAME, buff, numChars);
        free(buff);
        numChars = numChars*2;
        buff = (char*)malloc(numChars+1);
        fgets(buff,(numChars),entrada);
 
    }
    while (strchr(buff, separador) == NULL);       //if "separador" isnt in the line
    strncat(NAME,buff,strlen(buff));
    NAME[strlen(NAME)-1] = '\0';
    free(aux);
    free(buff);
}

OK, so this is what it does:
Three variables: buff, NAME and aux
For readin' from console, the inputs are buffer(stdin,'\n')
Buff grows double, as well as NAME and aux. Normally, NAME and aux contain the same, but I free NAME and aux form making them bigger.

So, why it doesn't work for files if I just put
buffer(file-name, EOF)
?

Thank you!!

[priyachari]

Hi,

Your File Pointer entrada, in case of a file ,should specify the mode in which the file is to be opened..

say,
entrada = fopen(FilePath,"r");

where filepath is the actual file with its path.

[Osoascam]

Thank you, but... It still doesn't work
The problem is it keeps reading forever