use stdio(3)

diff --git a/std.c b/std.c
index 84a4b49..c2f4c3e 100644 (file)
--- a/std.c
+++ b/std.c
@@ -15,6 +15,7 @@
 #include <sys/wait.h>
 #include <ctype.h>
 #include <err.h>
+#include <errno.h>
 #include <fcntl.h>
 #if !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
 #include <pty.h>
@@ -36,15 +37,8 @@ typedef struct {
        int n;
 } RingBuffer;
 
-typedef struct {
-       unsigned char data[BUFSIZ];
-       int i, n;
-       int fd;
-} ReadBuffer;
-
 static void buffer(char c);
 static void cmd(const char *cmdstr, ...);
-static int getch(ReadBuffer *buf);
 static void getpty(void);
 static void movea(int x, int y);
 static void mover(int x, int y);
@@ -54,7 +48,6 @@ static void scroll(int l);
 static void shell(void);
 static void sigchld(int n);
 static char unbuffer(void);
-static void ungetch(ReadBuffer *buf, int c);
 
 static int cols = 80, lines = 25;
 static int cx = 0, cy = 0;
@@ -63,7 +56,7 @@ static int ptm, pts;
 static _Bool bold, digit, qmark;
 static pid_t pid;
 static RingBuffer buf;
-static ReadBuffer cmdbuf, ptmbuf;
+static FILE *fptm;
 
 void
 buffer(char c) {
@@ -86,17 +79,6 @@ cmd(const char *cmdstr, ...) {
        va_end(ap);
 }
 
-int
-getch(ReadBuffer *buf) {
-       if(buf->i++ >= buf->n) {
-               buf->n = read(buf->fd, buf->data, BUFSIZ);
-               if(buf->n == -1)
-                       err(EXIT_FAILURE, "cannot read");
-               buf->i = 0;
-       }
-       return buf->data[buf->i];
-}
-
 void
 movea(int x, int y) {
        x = MAX(x, cols);
@@ -121,10 +103,10 @@ parseesc(void) {
        int arg[16];
 
        memset(arg, 0, LENGTH(arg));
-       c = getch(&ptmbuf);
+       c = getc(fptm);
        switch(c) {
        case '[':
-               c = getch(&ptmbuf);
+               c = getc(fptm);
                for(j = 0; j < LENGTH(arg);) {
                        if(isdigit(c)) {
                                digit = 1;
@@ -146,7 +128,7 @@ parseesc(void) {
                                }
                                break;
                        }
-                       c = getch(&ptmbuf);
+                       c = getc(fptm);
                }
                switch(c) {
                case '@':
@@ -220,7 +202,7 @@ parseesc(void) {
                break;
        default:
                putchar('\033');
-               ungetch(&ptmbuf, c);
+               ungetc(c, fptm);
        }
 }
 
@@ -308,13 +290,6 @@ unbuffer(void) {
        return c;
 }
 
-void
-ungetch(ReadBuffer *buf, int c) {
-       if(buf->i + 1 >= buf->n)
-               errx(EXIT_FAILURE, "buffer full");
-       buf->data[buf->i++] = c;
-}
-
 int
 main(int argc, char *argv[]) {
        fd_set rfds;
@@ -325,28 +300,31 @@ main(int argc, char *argv[]) {
                errx(EXIT_FAILURE, "usage: std [-v]");
        getpty();
        shell();
-       cmdbuf.fd = STDIN_FILENO;
-       ptmbuf.fd = ptm;
        FD_ZERO(&rfds);
        FD_SET(STDIN_FILENO, &rfds);
        FD_SET(ptm, &rfds);
+       if(!(fptm = fdopen(ptm, "r+")))
+               err(EXIT_FAILURE, "cannot open pty");
+       if(fcntl(ptm, F_SETFL, O_NONBLOCK) == -1)
+               err(EXIT_FAILURE, "cannot set pty to non-blocking mode");
+       if(fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK) == -1)
+               err(EXIT_FAILURE, "cannot set stdin to non-blocking mode");
        for(;;) {
-               if(select(ptm + 1, &rfds, NULL, NULL, NULL) == -1)
+               if(select(MAX(ptm, STDIN_FILENO) + 1, &rfds, NULL, NULL, NULL) == -1)
                        err(EXIT_FAILURE, "cannot select");
-               if(FD_ISSET(STDIN_FILENO, &rfds))
-                       do {
-                               c = getch(&cmdbuf);
-                               switch(c) {
-                               case ':':
-                                       parsecmd();
-                                       break;
-                               default:
+               if(FD_ISSET(ptm, &rfds)) {
+                       for(;;) {
+                               if((c = getc(fptm)) == EOF) {
+                                       if(feof(fptm)) {
+                                               FD_CLR(ptm, &rfds);
+                                               fflush(fptm);
+                                               break;
+                                       }
+                                       if(errno != EAGAIN)
+                                               err(EXIT_FAILURE, "cannot read from pty");
+                                       fflush(stdout);
                                        break;
                                }
-                       } while(cmdbuf.i < cmdbuf.n);
-               if(FD_ISSET(ptm, &rfds)) {
-                       do {
-                               c = getch(&ptmbuf);
                                switch(c) {
                                case '\033':
                                        parseesc();
@@ -354,9 +332,32 @@ main(int argc, char *argv[]) {
                                default:
                                        putchar(c);
                                }
-                       } while(ptmbuf.i < ptmbuf.n);
+                       }
                        fflush(stdout);
                }
+               if(FD_ISSET(STDIN_FILENO, &rfds)) {
+                       for(;;) {
+                               if((c = getchar()) == EOF) {
+                                       if(feof(stdin)) {
+                                               FD_CLR(STDIN_FILENO, &rfds);
+                                               fflush(fptm);
+                                               break;
+                                       }
+                                       if(errno != EAGAIN)
+                                               err(EXIT_FAILURE, "cannot read from stdin");
+                                       fflush(fptm);
+                                       break;
+                               }
+                               switch(c) {
+                               case ':':
+                                       parsecmd();
+                                       break;
+                               default:
+                                       putc(c, fptm);
+                               }
+                       }
+                       fflush(fptm);
+               }
        }
        return 0;
 }