init

1 files changed, 103 insertions, 0 deletions

diff --git a/tailburst.c b/tailburst.c
new file mode 100644
index 0000000..4f4ce49
--- /dev/null
+++ b/tailburst.c
@@ -0,0 +1,103 @@
+#include <stdio.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+
+#define BUFLEN 1024
+
+struct getline_states {
+	char *base;
+	char *cur;
+	size_t size;
+	size_t read;
+	char *next;
+};
+
+ssize_t fdgetline(int fd, struct getline_states *line) {
+	char *str;
+	ssize_t nread;
+
+	if (line->base == NULL) {
+		/* First pass: init state */
+		line->size = 120;
+		line->base = malloc(line->size);
+		if (line->base == NULL)
+			return -ENOMEM;
+		line->base[0] = '\0';
+		line->read = 0;
+		line->next = NULL;
+	}
+
+	/* Skip after previously returned line */
+	if (line->next)
+		line->cur = line->next;
+	else
+		line->cur = line->base;
+
+	/* Do we already have a full line in buffer? */
+	if (str = strchr(line->cur, '\n')) {
+		line->next = str+1;
+		str[0] = '\0'; 
+		return str - line->cur;
+	}
+
+	/* No such luck, move current to base and read what we can */
+	if (line->cur != line->base) {
+		line->read -= line->cur - line->base;
+		memmove(line->base, line->cur, line->read);
+		line->cur = line->base;
+	}
+
+	while ((nread = read(fd, line->base + line->read, line->size - line->read)) > 0 ) {
+		line->read += nread;
+
+		/* Check if we have a full line now */
+		if (str = strchr(line->base, '\n')) {
+			line->next = str+1;
+			str[0] = '\0'; 
+			return str - line->base;
+		}
+
+		/* realloc bigger buffer and try again */
+		line->size *= 2;
+		line->base = realloc(line->base, line->size);
+		if (line->base == NULL)
+			return -ENOMEM;
+	}
+
+	if (errno)
+		return -errno;
+	
+	return 0; /* no line read */
+}
+
+
+int main(int argc, char **argv)
+{
+	int flags, fd = 0, rc;
+	size_t len = 0;
+	ssize_t nread;
+	char buf[BUFLEN];
+	struct pollfd pollfd;
+	struct getline_states line = { 0 };
+
+	/* make stream non-block */
+	#if 0
+	flags = fcntl(fd, F_GETFL);
+	flags |= O_NONBLOCK;
+	fcntl(fd, F_SETFL, flags);
+	#endif
+
+	pollfd.fd = fd;
+	pollfd.events = POLLIN;
+	while ((nread = fdgetline(fd, &line)) > 0) {
+		if (poll(&pollfd, 1, 100) == 0) {
+			printf("%s\n", line.cur);
+		}
+	}
+
+	return 0;
+}