DataFile.c

//
// Created by owd on 9/5/25.
//
 
#include "DataFile.h"
 
#include <ctype.h>
#include <errno.h>
#include <string.h>
 
FILE * datafile_create(const char * const filename)
{
    errno = 0;
    FILE * const fp = fopen(filename, "r+");
 
    if (fp == NULL) {
        if (errno == 0) {
            fputs("could not open stock data file : ", stdout);
            puts(filename);
        } else {
            fputs(strerror(errno), stdout);
            fputs(" : ", stdout);
            puts(filename);
        }
    } else {
        fputs("using stock data file : ", stdout);
        puts(filename);
        putchar('\n');
    }
 
    return fp;
}
 
void datafile_delete(FILE **this)
{
    fclose(*this);
    *this = NULL;
}