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/**
* @file writefile.c
*
* Write file utility. Writes file from stdin.
*
* @author Richard Dzenis <rixript@gmail.com>
*/
#include <nuttx/config.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <termios.h>
#include <systemlib/err.h>
__EXPORT int writefile_main(int argc, char *argv[]);
static
ssize_t
min(ssize_t v1, ssize_t v2)
{
return v1 > v2 ? v2 : v1;
}
int
writefile_main(int argc, char *argv[])
{
if (argc < 3) {
errx(1, "usage: writefile <filename> <filesize in bytes>");
}
/* open output file */
FILE *f;
f = fopen(argv[1], "w");
if (f == NULL) {
printf("ERROR opening file\n");
exit(1);
}
ssize_t size = atol(argv[2]);
if(size <= 0) {
warnx("ERROR invalid size");
}
/* configure stdin */
int in = fileno(stdin);
struct termios tc;
struct termios tc_old;
tcgetattr(in, &tc);
/* save old terminal attributes to restore it later on exit */
memcpy(&tc_old, &tc, sizeof(tc));
/* don't add CR on each LF*/
tc.c_oflag &= ~ONLCR;
if (tcsetattr(in, TCSANOW, &tc) < 0) {
warnx("ERROR setting stdin attributes");
exit(1);
}
char buf[512];
ssize_t nread = 0;
printf("OK\r\n");
/* read stdin, and write to file */
while ((nread = read(in, buf, min(sizeof(buf), size))) > 0) {
if (fwrite(buf, 1, nread, f) != nread) {
warnx("ERROR writing file");
break;
}
size -= nread;
if (size <= 0)
break;
}
fclose(f);
/* restore old terminal attributes */
if (tcsetattr(in, TCSANOW, &tc_old) < 0) {
warnx("ERROR restoring stdin attributes");
exit(1);
}
return OK;
}
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