samba-mirror/examples/libsmbclient/testtruncate.c

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <libsmbclient.h>
#include "get_auth_data_fn.h"


int main(int argc, char * argv[])
{
	int             fd;
	int             ret;
	int             debug = 0;
	int             savedErrno;
	char            buffer[128];
	struct stat     st;

	if (argc != 2)
	{
		printf("usage: "
		       "%s smb://path/to/file\n",
		       argv[0]);
		return 1;
	}

	smbc_init(get_auth_data_fn, debug);

	if ((fd = smbc_open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0)) < 0)
	{
		perror("smbc_open");
		return 1;
	}

	snprintf(buffer, sizeof(buffer), "%s", "Hello world.\nThis is a test.\n");

	ret = smbc_write(fd, buffer, strlen(buffer));
	savedErrno = errno;
	smbc_close(fd);

	if (ret < 0)
	{
		errno = savedErrno;
		perror("write");
	}

	if (smbc_stat(argv[1], &st) < 0)
	{
		perror("smbc_stat");
		return 1;
	}

	printf("Original size: %lu\n", (unsigned long) st.st_size);

	if ((fd = smbc_open(argv[1], O_WRONLY, 0)) < 0)
	{
		perror("smbc_open");
		return 1;
	}

	ret = smbc_ftruncate(fd, 13);
	savedErrno = errno;
	smbc_close(fd);
	if (ret < 0)
	{
		errno = savedErrno;
		perror("smbc_ftruncate");
		return 1;
	}

	if (smbc_stat(argv[1], &st) < 0)
	{
		perror("smbc_stat");
		return 1;
	}

	printf("New size: %lu\n", (unsigned long) st.st_size);

	return 0;
}