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rt-thread-official/examples/libc/file.c

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/*
* 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);
}
FINSH_FUNCTION_EXPORT(libc_fstat, fstat test for libc);
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);
}
FINSH_FUNCTION_EXPORT(libc_lseek, lseek test for libc);
void sleep(int tick)
{
rt_thread_sleep(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;
}
FINSH_FUNCTION_EXPORT(libc_fseek, lseek test for libc);
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