Added missing libsw library

external/libsdf/libsw/memfile.c

@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <string.h>
+#include "Malloc.h"
+#include "Msgs.h"
+#include "error.h"
+#include "protos.h"
+#include "mpmy.h"
+
+/* Here we try to implement a cicular memory buffer which we can use as */
+/* the vfprintf-like arg to Msg_init */
+
+static char *memfile;
+static int memfile_offset;
+static int memfile_bufsz;
+
+void
+memfile_init(int sz)
+{
+    memfile = Malloc(sz);
+    memfile_offset = 0;
+    memfile_bufsz = sz-1;
+    memfile[sz-1] = 0;   /* final null to make wrapped output cleaner */
+}
+
+void
+memfile_delete(void)
+{
+    Free(memfile);
+    memfile_offset = 0;
+    memfile_bufsz = 0;
+}
+
+#define BUFSZ 1024
+
+void
+memfile_vfprintf(void *junk, const char *fmt, va_list args)
+{
+    char tbuf[BUFSZ];	/* This might overflow, but msgs should be small */
+    int i, len;
+
+    vsprintf(tbuf, fmt, args);
+    len = strlen(tbuf);
+    if (len >= BUFSZ) Error("Buffer overflowed in mem_vfprintf\n");
+    for (i = 0; i <= len; i++) {
+	memfile[(memfile_offset+i)%memfile_bufsz] = tbuf[i];
+    }
+    memfile_offset += len;
+}
+
+void
+PrintMemfile(void)
+{
+    if (memfile_offset == 0) return;
+    printf("----- Messages from procnum %d -----\n", MPMY_Procnum());
+    if (memfile_offset < memfile_bufsz) {
+	printf("%s\n", memfile);
+    } else {
+	printf("Buffer has wrapped\n");
+	printf("%s\n%s\n", memfile+(memfile_offset+1)%memfile_bufsz,
+	       memfile);
+    }
+    fflush(stdout);
+}