return fd;
}
+static bool
+write_buf (const char *buf, int fdout, ssize_t remain)
+{
+ const char *p = buf;
+
+ do {
+ ssize_t written = write (fdout, p, remain);
+ if (written < 0 && errno == EINTR)
+ continue;
+ if (written <= 0) {
+ fprintf (stderr, "Error: writing to temporary file: %s",
+ strerror (errno));
+ return false;
+ }
+ p += written;
+ remain -= written;
+ } while (remain > 0);
+ return true;
+}
+
/*
* Copy fdin to fdout, return true on success, and false on errors and
* empty input.
copy_fd (int fdout, int fdin)
{
bool empty = true;
+ bool first = true;
+ const char *header = "X-Envelope-From: ";
while (! interrupted) {
ssize_t remain;
char buf[4096];
- char *p;
+ const char *p = buf;
remain = read (fdin, buf, sizeof (buf));
if (remain == 0)
return false;
}
- p = buf;
- do {
- ssize_t written = write (fdout, p, remain);
- if (written < 0 && errno == EINTR)
- continue;
- if (written <= 0) {
- fprintf (stderr, "Error: writing to temporary file: %s",
- strerror (errno));
+ if (first && remain >= 5 && 0 == strncmp (buf, "From ", 5)) {
+ if (! write_buf (header, fdout, strlen (header)))
return false;
- }
- p += written;
- remain -= written;
- empty = false;
- } while (remain > 0);
+ p += 5;
+ remain -= 5;
+ }
+
+ first = false;
+
+ if (! write_buf (p, fdout, remain))
+ return false;
+ empty = false;
}
return (! interrupted && ! empty);