fopen("/dev/clipboard", "wt") sets O_TEXT, fprintf() does LF->CRLF
conversion but write() does not. The latter is IMO a bug.
fopen("/dev/clipboard", "wb") sets both O_TEXT and O_BINARY, fwrite()
and write() do no conversion. The set_flags() call in
fhandler_dev_clipboard::open() should possibly clear O_BINARY.
With regular files, everything works as expected.
Testcase:
$ uname -srvm
CYGWIN_NT-6.1-WOW64 1.7.25(0.270/5/3) 2013-08-31 20:39 i686
$ cat testmode.c
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
int main(int argc, char **argv)
{
const char * name = argv[1], * flags = argv[2];
FILE * f = fopen(name, flags);
if (!f) {
perror(name); return 1;
}
int fd = fileno(f), mode = getmode(fd);
printf("fd=%d, mode=%x%s%s\n", fd, mode,
(mode & O_BINARY ? " O_BINARY":""),
(mode & O_TEXT ? " O_TEXT":""));
fprintf(f, "printf1\nprintf2\n"); fflush(f);
write(fd, "write1\nwrite2\n", 14);
fprintf(f, "printf3\nprintf4\n"); fflush(f);
write(fd, "write3\nwrite4\n", 14);
fclose(f);
return 0;
}
$ gcc -o testmode testmode.c
$ ./testmode /dev/clipboard wt ; cat -A /dev/clipboard
fd=3, mode=20000 O_TEXT
printf1^M$
printf2^M$
write1$
write2$
printf3^M$
printf4^M$
write3$
write4$
$ ./testmode /dev/clipboard wb ; cat -A /dev/clipboard
fd=3, mode=30000 O_BINARY O_TEXT
printf1$
printf2$
write1$
write2$
printf3$
printf4$
write3$
write4$
$ ./testmode out wt ; cat -A out
fd=3, mode=20000 O_TEXT
printf1^M$
printf2^M$
write1^M$
...
$ ./testmode out wb ; cat -A out
fd=3, mode=10000 O_BINARY
printf1$
printf2$
write1$
...
This is likely the reason for the following inconsistent behavior:
$ echo test1 >/dev/clipboard ; cat -A /dev/clipboard
test1$
$ /bin/echo test2 >/dev/clipboard ; cat -A /dev/clipboard
test2^M$
$ /bin/echo test3 | cat > /dev/clipboard ; cat -A /dev/clipboard
test3$
$ echo test4 | sed s,x,x, > /dev/clipboard ; cat -A /dev/clipboard
test4^M$
Christian
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