Remove buffering to fileio instead of calling fflush

By default text files are line buffered, and this means that -f option will
not write the line until a \n is printed. This is not very useful for
debugging, so a call to fflush was added. This patch substitute this call
(which will be done by each character painted) by the full remove of the
buffering in the file.
---
 st.c |   12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

1 files changed, 5 insertions, 7 deletions

diff --git a/st.c b/st.c
index 8741145..19d0a86 100644
--- a/st.c
+++ b/st.c
@@ -355,7 +355,7 @@ static STREscape strescseq;
 static int cmdfd;
 static pid_t pid;
 static Selection sel;
-static FILE *fileio;
+static int iofd = -1;
 static char **opt_cmd  = NULL;
 static char *opt_io    = NULL;
 static char *opt_title = NULL;
@@ -821,9 +821,9 @@ ttynew(void) {
                 signal(SIGCHLD, sigchld);
                 if(opt_io) {
                         if(!strcmp(opt_io, "-")) {
-                                fileio = stdout;
+                                iofd = STDOUT_FILENO;
                         } else {
-                                if(!(fileio = fopen(opt_io, "w"))) {
+                                if((iofd = open(opt_io, O_WRONLY | O_CREAT, 0666)) < 0) {
                                         fprintf(stderr, "Error opening %s:%s\n",
                                                 opt_io, strerror(errno));
                                 }
@@ -1599,10 +1599,8 @@ void
 tputc(char *c) {
         char ascii = *c;
 
-        if(fileio) {
-                putc(ascii, fileio);
-                fflush(fileio);
-        }
+        if(iofd != -1)
+                write(iofd, c, 1);
 
         if(term.esc & ESC_START) {
                 if(term.esc & ESC_CSI) {