source: mainline/uspace/app/tester/stdio/stdio1.c@ 1877128

/*
 * Copyright (c) 2008 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include "../tester.h"

#define BUF_SIZE  32

static char buf[BUF_SIZE + 1];

const char *test_stdio1(void)
{
        FILE *file;
        const char *file_name = "/textdemo";
        
        TPRINTF("Open file \"%s\"...", file_name);
        errno = 0;
        file = fopen(file_name, "rt");
        if (file == NULL) {
                TPRINTF("errno = %d\n", errno);
                return "Failed opening file";
        } else
                TPRINTF("OK\n");
        
        TPRINTF("Read file...");
        size_t cnt = fread(buf, 1, BUF_SIZE, file);
        if (ferror(file)) {
                TPRINTF("errno = %d\n", errno);
                fclose(file);
                return "Failed reading file";
        } else
                TPRINTF("OK\n");
        
        buf[cnt] = '\0';
        TPRINTF("Read %zu bytes, string \"%s\"\n", cnt, buf);
        
        TPRINTF("Seek to beginning...");
        if (fseek(file, 0, SEEK_SET) != 0) {
                TPRINTF("errno = %d\n", errno);
                fclose(file);
                return "Failed seeking in file";
        } else
                TPRINTF("OK\n");
        
        TPRINTF("Read using fgetc()...");
        while (true) {
                int c = fgetc(file);
                if (c == EOF)
                        break;
                
                TPRINTF(".");
        }
        TPRINTF("[EOF]\n");
        
        TPRINTF("Close...");
        if (fclose(file) != 0) {
                TPRINTF("errno = %d\n", errno);
                return "Failed closing file";
        } else
                TPRINTF("OK\n");
        
        return NULL;
}