shithub: hx

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print whatever was read as soon as possible

--- a/README.md

+++ b/README.md

@@ -18,4 +18,5 @@

 # Notes

-`echo blah | hx` won't print anything, use `echo blah | hx /dev/stdin` instead.

+ * `echo blah | hx` won't print anything, use `echo blah | hx /dev/stdin` instead.

+ * hx will print data as soon as it is available (if used on pipes), without buffering.

--- a/hx.c

+++ b/hx.c

@@ -8,6 +8,8 @@

 #include <stdio.h>

 #include <stdlib.h>

 #include <string.h>

+#include <sys/select.h>

+#include <sys/time.h>

 #include <unistd.h>

 enum

@@ -35,7 +37,9 @@

 	ssize_t sz, i;

 	char s[65536], c;

 	unsigned char line[16];

-	int wroff, off, eof, wrlen, lineoff, r;

+	fd_set set;

+	struct timeval timeout;

+	int wroff, off, eof, lineoff, r;

 #ifdef __linux__

 	readahead(fd, 0, Bufsz);

@@ -46,18 +50,6 @@

 	eof = 0;

 	for (addr = 0; eof == 0 && (sz = read(fd, buf, Bufsz)) > 0;) {

 		for (i = 0; i < sz; ) {

-			if (off >= (int)sizeof(s)-Linesz) {

-				wrlen = off - (off % Linesz);

-				for (wroff = 0; wroff < wrlen; wroff += r) {

-					if ((r = write(1, s+wroff, wrlen-wroff)) < 0) {

-						sz = -1;

-						break;

-					}

-				}

-				memmove(s, s+wrlen, off-wrlen);

-				off -= wrlen;

-			}

-

 			if (lineoff == 0) {

 				s[off++] = b2h[((addr>>55) & 0x1fe)];

 				s[off++] = b2h[((addr>>55) & 0x1fe)+1];

@@ -103,11 +95,32 @@

 				s[off++] = '\n';

 				lineoff = 0;

 			}

+

+			if (off >= (int)sizeof(s)-Linesz) {

+writes:

+				for (wroff = 0; wroff < off; wroff += r) {

+					if ((r = write(1, s+wroff, off-wroff)) < 0) {

+						sz = -1;

+						break;

+					}

+				}

+				off = 0;

+			}

 		}

+		if (sz == 0)

+			continue;

 #ifdef __linux__

 		readahead(fd, addr, Bufsz);

 #endif

+		FD_ZERO(&set);

+		FD_SET(fd, &set);

+		timeout.tv_sec = 0;

+		timeout.tv_usec = 1000;

+		if (select(fd+1, &set, NULL, NULL, &timeout) == 0) {

+			sz = 0;

+			goto writes;

+		}

 	}

 	if (sz >= 0) {