rt-thread/examples/libc/file.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2010-11-17     Bernard      first version
 */

#include <stdio.h>
#include <stdlib.h>
#include <finsh.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/stat.h>

const char* text = "this is a test string\n";
void libc_fstat()
{
    int fd;
    struct stat s;

    fd = open("/tmp/tt.txt", O_WRONLY | O_CREAT, 0);
    if (fd < 0)
    {
        printf("open failed\n");
        return;
    }

    write(fd, text, strlen(text) + 1);
    printf("begin: %d\n", lseek(fd, 0, SEEK_SET));
    printf("end: %d\n", lseek(fd, 0, SEEK_END));

    printf("fstat result: %d\n", fstat(fd, &s));
    close(fd);
}

void libc_lseek()
{
    int fd;

    fd = open("/tmp/tt.txt", O_WRONLY | O_CREAT, 0);
    if (fd < 0)
    {
        printf("open failed\n");
        return;
    }

    write(fd, text, strlen(text) + 1);
    printf("begin: %d\n", lseek(fd, 0, SEEK_SET));
    printf("end: %d\n", lseek(fd, 0, SEEK_END));
    close(fd);
}

void sleep(int tick)
{
    rt_thread_delay(tick);
}

int libc_fseek(void)
{
    const char *tmpdir;
    char *fname;
    int fd;
    FILE *fp;
    const char outstr[] = "hello world!\n";
    char strbuf[sizeof outstr];
    char buf[200];
    struct stat st1;
    struct stat st2;
    int result = 0;

    tmpdir = getenv("TMPDIR");
    if (tmpdir == NULL || tmpdir[0] == '\0')
        tmpdir = "/tmp";

    asprintf(&fname, "%s/tst-fseek.XXXXXX", tmpdir);
    if (fname == NULL)
    {
        fprintf(stderr, "cannot generate name for temporary file: %s\n",
                strerror(errno));
        return 1;
    }

    /* Create a temporary file.   */
    fd = mkstemp(fname);
    if (fd == -1)
    {
        fprintf(stderr, "cannot open temporary file: %s\n", strerror(errno));
        return 1;
    }

    fp = fdopen(fd, "w+");
    if (fp == NULL)
    {
        fprintf(stderr, "cannot get FILE for temporary file: %s\n", strerror(
                errno));
        return 1;
    }
    setbuffer(fp, strbuf, sizeof(outstr) - 1);

    if (fwrite(outstr, sizeof(outstr) - 1, 1, fp) != 1)
    {
        printf("%d: write error\n", __LINE__);
        result = 1;
        goto out;
    }

    /* The EOF flag must be reset.  */
    if (fgetc(fp) != EOF)
    {
        printf("%d: managed to read at end of file\n", __LINE__);
        result = 1;
    }
    else if (!feof(fp))
    {
        printf("%d: EOF flag not set\n", __LINE__);
        result = 1;
    }
    if (fseek(fp, 0, SEEK_CUR) != 0)
    {
        printf("%d: fseek(fp, 0, SEEK_CUR) failed\n", __LINE__);
        result = 1;
    }
    else if (feof(fp))
    {
        printf("%d: fseek() didn't reset EOF flag\n", __LINE__);
        result = 1;
    }

    /* Do the same for fseeko().  */
    if (fgetc(fp) != EOF)
    {
        printf("%d: managed to read at end of file\n", __LINE__);
        result = 1;
    }
    else if (!feof(fp))
    {
        printf("%d: EOF flag not set\n", __LINE__);
        result = 1;
    }
    if (fseeko(fp, 0, SEEK_CUR) != 0)
    {
        printf("%d: fseek(fp, 0, SEEK_CUR) failed\n", __LINE__);
        result = 1;
    }
    else if (feof(fp))
    {
        printf("%d: fseek() didn't reset EOF flag\n", __LINE__);
        result = 1;
    }

    /* Go back to the beginning of the file: absolute.  */
    if (fseek(fp, 0, SEEK_SET) != 0)
    {
        printf("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
        result = 1;
    }
    else if (fflush(fp) != 0)
    {
        printf("%d: fflush() failed\n", __LINE__);
        result = 1;
    }
    else if (lseek(fd, 0, SEEK_CUR) != 0)
    {
        int pos = lseek(fd, 0, SEEK_CUR);
        printf("%d: lseek() returned different position, pos %d\n", __LINE__,
                pos);
        result = 1;
    }
    else if (fread(buf, sizeof(outstr) - 1, 1, fp) != 1)
    {
        printf("%d: fread() failed\n", __LINE__);
        result = 1;
    }
    else if (memcmp(buf, outstr, sizeof(outstr) - 1) != 0)
    {
        printf("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
        result = 1;
    }

    /* Now with fseeko.  */
    if (fseeko(fp, 0, SEEK_SET) != 0)
    {
        printf("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
        result = 1;
    }
    else if (fflush(fp) != 0)
    {
        printf("%d: fflush() failed\n", __LINE__);
        result = 1;
    }
    else if (lseek(fd, 0, SEEK_CUR) != 0)
    {
        printf("%d: lseek() returned different position\n", __LINE__);
        result = 1;
    }
    else if (fread(buf, sizeof(outstr) - 1, 1, fp) != 1)
    {
        printf("%d: fread() failed\n", __LINE__);
        result = 1;
    }
    else if (memcmp(buf, outstr, sizeof(outstr) - 1) != 0)
    {
        printf("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
        result = 1;
    }

    /* Go back to the beginning of the file: relative.  */
    if (fseek(fp, -((int) sizeof(outstr) - 1), SEEK_CUR) != 0)
    {
        printf("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
        result = 1;
    }
    else if (fflush(fp) != 0)
    {
        printf("%d: fflush() failed\n", __LINE__);
        result = 1;
    }
    else if (lseek(fd, 0, SEEK_CUR) != 0)
    {
        printf("%d: lseek() returned different position\n", __LINE__);
        result = 1;
    }
    else if (fread(buf, sizeof(outstr) - 1, 1, fp) != 1)
    {
        printf("%d: fread() failed\n", __LINE__);
        result = 1;
    }
    else if (memcmp(buf, outstr, sizeof(outstr) - 1) != 0)
    {
        printf("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
        result = 1;
    }

    /* Now with fseeko.  */
    if (fseeko(fp, -((int) sizeof(outstr) - 1), SEEK_CUR) != 0)
    {
        printf("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
        result = 1;
    }
    else if (fflush(fp) != 0)
    {
        printf("%d: fflush() failed\n", __LINE__);
        result = 1;
    }
    else if (lseek(fd, 0, SEEK_CUR) != 0)
    {
        printf("%d: lseek() returned different position\n", __LINE__);
        result = 1;
    }
    else if (fread(buf, sizeof(outstr) - 1, 1, fp) != 1)
    {
        printf("%d: fread() failed\n", __LINE__);
        result = 1;
    }
    else if (memcmp(buf, outstr, sizeof(outstr) - 1) != 0)
    {
        printf("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
        result = 1;
    }

    /* Go back to the beginning of the file: from the end.  */
    if (fseek(fp, -((int) sizeof(outstr) - 1), SEEK_END) != 0)
    {
        printf("%d: fseek(fp, 0, SEEK_SET) failed\n", __LINE__);
        result = 1;
    }
    else if (fflush(fp) != 0)
    {
        printf("%d: fflush() failed\n", __LINE__);
        result = 1;
    }
    else if (lseek(fd, 0, SEEK_CUR) != 0)
    {
        printf("%d: lseek() returned different position\n", __LINE__);
        result = 1;
    }
    else if (fread(buf, sizeof(outstr) - 1, 1, fp) != 1)
    {
        printf("%d: fread() failed\n", __LINE__);
        result = 1;
    }
    else if (memcmp(buf, outstr, sizeof(outstr) - 1) != 0)
    {
        printf("%d: content after fseek(,,SEEK_SET) wrong\n", __LINE__);
        result = 1;
    }

    /* Now with fseeko.  */
    if (fseeko(fp, -((int) sizeof(outstr) - 1), SEEK_END) != 0)
    {
        printf("%d: fseeko(fp, 0, SEEK_SET) failed\n", __LINE__);
        result = 1;
    }
    else if (fflush(fp) != 0)
    {
        printf("%d: fflush() failed\n", __LINE__);
        result = 1;
    }
    else if (lseek(fd, 0, SEEK_CUR) != 0)
    {
        printf("%d: lseek() returned different position\n", __LINE__);
        result = 1;
    }
    else if (fread(buf, sizeof(outstr) - 1, 1, fp) != 1)
    {
        printf("%d: fread() failed\n", __LINE__);
        result = 1;
    }
    else if (memcmp(buf, outstr, sizeof(outstr) - 1) != 0)
    {
        printf("%d: content after fseeko(,,SEEK_SET) wrong\n", __LINE__);
        result = 1;
    }

    if (fwrite(outstr, sizeof(outstr) - 1, 1, fp) != 1)
    {
        printf("%d: write error 2\n", __LINE__);
        result = 1;
        goto out;
    }

    if (fwrite(outstr, sizeof(outstr) - 1, 1, fp) != 1)
    {
        printf("%d: write error 3\n", __LINE__);
        result = 1;
        goto out;
    }

    if (fwrite(outstr, sizeof(outstr) - 1, 1, fp) != 1)
    {
        printf("%d: write error 4\n", __LINE__);
        result = 1;
        goto out;
    }

    if (fwrite(outstr, sizeof(outstr) - 1, 1, fp) != 1)
    {
        printf("%d: write error 5\n", __LINE__);
        result = 1;
        goto out;
    }

    if (fputc('1', fp) == EOF || fputc('2', fp) == EOF)
    {
        printf("%d: cannot add characters at the end\n", __LINE__);
        result = 1;
        goto out;
    }

    /* Check the access time.  */
    if (fstat(fd, &st1) < 0)
    {
        printf("%d: fstat64() before fseeko() failed\n\n", __LINE__);
        result = 1;
    }
    else
    {
        sleep(1);

        if (fseek(fp, -(2 + 2 * (sizeof(outstr) - 1)), SEEK_CUR) != 0)
        {
            printf("%d: fseek() after write characters failed\n", __LINE__);
            result = 1;
            goto out;
        }
        else
        {

            time_t t;
            /* Make sure the timestamp actually can be different.  */
            sleep(1);
            t = time(NULL);

            if (fstat(fd, &st2) < 0)
            {
                printf("%d: fstat64() after fseeko() failed\n\n", __LINE__);
                result = 1;
            }
            if (st1.st_ctime >= t)
            {
                printf("%d: st_ctime not updated\n", __LINE__);
                result = 1;
            }
            if (st1.st_mtime >= t)
            {
                printf("%d: st_mtime not updated\n", __LINE__);
                result = 1;
            }
            if (st1.st_ctime >= st2.st_ctime)
            {
                printf("%d: st_ctime not changed\n", __LINE__);
                result = 1;
            }
            if (st1.st_mtime >= st2.st_mtime)
            {
                printf("%d: st_mtime not changed\n", __LINE__);
                result = 1;
            }
        }
    }

    if (fread(buf, 1, 2 + 2 * (sizeof(outstr) - 1), fp) != 2 + 2
            * (sizeof(outstr) - 1))
    {
        printf("%d: reading 2 records plus bits failed\n", __LINE__);
        result = 1;
    }
    else if (memcmp(buf, outstr, sizeof(outstr) - 1) != 0 || memcmp(
            &buf[sizeof(outstr) - 1], outstr, sizeof(outstr) - 1) != 0 || buf[2
            * (sizeof(outstr) - 1)] != '1' || buf[2 * (sizeof(outstr) - 1) + 1]
            != '2')
    {
        printf("%d: reading records failed\n", __LINE__);
        result = 1;
    }
    else if (ungetc('9', fp) == EOF)
    {
        printf("%d: ungetc() failed\n", __LINE__);
        result = 1;
    }
    else if (fseek(fp, -(2 + 2 * (sizeof(outstr) - 1)), SEEK_END) != 0)
    {
        printf("%d: fseek after ungetc failed\n", __LINE__);
        result = 1;
    }
    else if (fread(buf, 1, 2 + 2 * (sizeof(outstr) - 1), fp) != 2 + 2
            * (sizeof(outstr) - 1))
    {
        printf("%d: reading 2 records plus bits failed\n", __LINE__);
        result = 1;
    }
    else if (memcmp(buf, outstr, sizeof(outstr) - 1) != 0 || memcmp(
            &buf[sizeof(outstr) - 1], outstr, sizeof(outstr) - 1) != 0 || buf[2
            * (sizeof(outstr) - 1)] != '1')
    {
        printf("%d: reading records for the second time failed\n", __LINE__);
        result = 1;
    }
    else if (buf[2 * (sizeof(outstr) - 1) + 1] == '9')
    {
        printf("%d: unget character not ignored\n", __LINE__);
        result = 1;
    }
    else if (buf[2 * (sizeof(outstr) - 1) + 1] != '2')
    {
        printf("%d: unget somehow changed character\n", __LINE__);
        result = 1;
    }

    fclose(fp);

    fp = fopen(fname, "r");
    if (fp == NULL)
    {
        printf("%d: fopen() failed\n\n", __LINE__);
        result = 1;
    }
    else if (fstat(fileno(fp), &st1) < 0)
    {
        printf("%d: fstat64() before fseeko() failed\n\n", __LINE__);
        result = 1;
    }
    else if (fseeko(fp, 0, SEEK_END) != 0)
    {
        printf("%d: fseeko(fp, 0, SEEK_END) failed\n", __LINE__);
        result = 1;
    }
    else if (ftello(fp) != st1.st_size)
    {
        printf("%d: fstat64 st_size %zd ftello %zd\n", __LINE__,
                (size_t) st1.st_size, (size_t) ftello(fp));
        result = 1;
    }
    else
        printf("%d: SEEK_END works\n", __LINE__);
    if (fp != NULL)
        fclose(fp);

    fp = fopen(fname, "r");
    if (fp == NULL)
    {
        printf("%d: fopen() failed\n\n", __LINE__);
        result = 1;
    }
    else if (fstat(fileno(fp), &st1) < 0)
    {
        printf("%d: fstat64() before fgetc() failed\n\n", __LINE__);
        result = 1;
    }
    else if (fgetc(fp) == EOF)
    {
        printf("%d: fgetc() before fseeko() failed\n\n", __LINE__);
        result = 1;
    }
    else if (fseeko(fp, 0, SEEK_END) != 0)
    {
        printf("%d: fseeko(fp, 0, SEEK_END) failed\n", __LINE__);
        result = 1;
    }
    else if (ftello(fp) != st1.st_size)
    {
        printf("%d: fstat64 st_size %zd ftello %zd\n", __LINE__,
                (size_t) st1.st_size, (size_t) ftello(fp));
        result = 1;
    }
    else
        printf("%d: SEEK_END works\n", __LINE__);
    if (fp != NULL)
        fclose(fp);

    out: unlink(fname);

    return result;
}