Diff: fifo.h

Revision:

0:7da612835693

Child:

1:4676e8b9b357

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/fifo.h	Wed Jun 15 19:12:25 2011 +0000
@@ -0,0 +1,61 @@
+#ifndef FIFO_H
+#define FIFO_H
+
+class fifo {
+    char *buf;
+    int size, in, out, free;
+//    fifo() {}
+public:
+    fifo(int sz = 127):size(sz), in(0), out(0), free(sz) {
+        buf = new char[sz];
+    }
+    ~fifo() {
+        delete[] buf;
+    }
+
+    void put(char c) {
+        if (free) {
+            buf[in++] = c;
+            if (in==size) in = 0;
+            free--;
+        } else
+            printf("fifo full\n");
+    }
+
+    int get() {
+        if (free == size)
+            return -1;
+        free++;
+        int c = buf[out++];
+        if (out == size) out = 0;
+        return c;
+    }
+    int gets(char *line, int len) {
+       int i = out, n = size-free, l = 0;
+       while (n>0 && buf[i] != '\n' && l<len-1) {
+         if (buf[i] != '\r')
+           line[l++] = buf[i++];
+         else
+           i++; //skip the \r
+         if (i==size) i = 0;
+         n--;
+       }
+       if (n==0) //buf does not contain EOLN
+         return -1;
+       if (buf[i] == '\n') {
+         line[l] = '\0';
+         out = i+1;
+         if (out==size) out = 0;
+         free = size - n + 1;
+         return 0; //success
+       } else //line too short
+         return -2;
+    }
+    void flush() {
+      free = size;
+      in = 0;
+      out = 0;
+    }
+};
+
+#endif
\ No newline at end of file