testcases/network/tcp_cmds/echo/createfile.c

/*
@! # TESTCASE DESCRIPTION:
@! # 	Purpose: to create an input file of any size
@! # 	Command: none
@! # 	Subcommand: none
@! # 	Design: Write an array the size of BUFSIZ to created file until
@! # 		the file size matches the file size required
@! # SPEC. EXEC. REQS:  This  program is used by ctatcdt3.c and ctatcet3.c
*/

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char *argv[])
{

	int fd;
	int fsize;
	int count = 0;
	int n, remain;
	static char buf[BUFSIZ];

	for (fsize = 0; fsize < BUFSIZ; fsize++) {
		if ((fsize % 2) == 0)
			buf[fsize++] = 'U';
		else
			buf[fsize++] = '\n';
	}

	fsize = strtol(argv[1], NULL, 10);

	if ((fd = creat(argv[2], 0644)) == -1)
		perror("createfile");
	if (fsize >= BUFSIZ) {
		count = fsize / BUFSIZ;
		remain = fsize % BUFSIZ;
	} else
		remain = fsize;
	while (count-- != 0) {
		if ((n = write(fd, buf, BUFSIZ)) != BUFSIZ)
			perror("createfile");
	}
	if ((n = write(fd, buf, remain)) != remain)
		perror("createfile");
	close(fd);

	return 0;
}