Data commit

Task/Stream-merge/C/stream-merge.c

@@ -0,0 +1,43 @@
+/*
+ * Rosetta Code - stream merge in C.
+ *
+ * Two streams (text files) with integer numbers, C89, Visual Studio 2010.
+ *
+ */
+
+#define _CRT_SECURE_NO_WARNINGS
+#include <stdio.h>
+#include <stdlib.h>
+
+#define GET(N) { if(fscanf(f##N,"%d",&b##N ) != 1) f##N = NULL; }
+#define PUT(N) { printf("%d\n", b##N); GET(N) }
+
+void merge(FILE* f1, FILE* f2, FILE* out)
+{
+    int b1;
+    int b2;
+
+    if(f1) GET(1)
+    if(f2) GET(2)
+
+    while ( f1 && f2 )
+    {
+        if ( b1 <= b2 ) PUT(1)
+        else            PUT(2)
+    }
+    while (f1 ) PUT(1)
+    while (f2 ) PUT(2)
+}
+
+int main(int argc, char* argv[])
+{
+    if ( argc < 3 || argc > 3 )
+    {
+        puts("streammerge filename1 filename2");
+        exit(EXIT_FAILURE);
+    }
+    else
+        merge(fopen(argv[1],"r"),fopen(argv[2],"r"),stdout);
+
+    return EXIT_SUCCESS;
+}