From 5376b9056bf7465adcbfbe9709d76d6c950864e0 Mon Sep 17 00:00:00 2001
From: sjplimp <sjplimp@f3b2605a-c512-4ea7-a41b-209d697bcdaa>
Date: Fri, 8 Nov 2013 20:32:38 +0000
Subject: [PATCH] git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@11003
 f3b2605a-c512-4ea7-a41b-209d697bcdaa

---
 src/comm.cpp | 36 ++++++++++++++++++++++++++++++++++++
 src/comm.h   |  1 +
 2 files changed, 37 insertions(+)

diff --git a/src/comm.cpp b/src/comm.cpp
index be6970e4d9..1bb82bd8c4 100644
--- a/src/comm.cpp
+++ b/src/comm.cpp
@@ -1597,6 +1597,42 @@ int Comm::read_lines_from_file(FILE *fp, int nlines, int maxline, char *buf)
   return 0;
 }
 
+/* ----------------------------------------------------------------------
+   proc 0 reads Nlines from file into buf and bcasts buf to all procs
+   caller allocates buf to max size needed
+   each line is terminated by newline, even if last line in file is not
+   return 0 if successful, 1 if get EOF error before read is complete
+------------------------------------------------------------------------- */
+
+int Comm::read_lines_from_file_universe(FILE *fp, int nlines, int maxline,
+                                        char *buf)
+{
+  int m;
+
+  int me_universe = universe->me;
+  MPI_Comm uworld = universe->uworld;
+
+  if (me_universe == 0) {
+    m = 0;
+    for (int i = 0; i < nlines; i++) {
+      if (!fgets(&buf[m],maxline,fp)) {
+	m = 0;
+	break;
+      }
+      m += strlen(&buf[m]);
+    }
+    if (m) {
+      if (buf[m-1] != '\n') strcpy(&buf[m++],"\n");
+      m++;
+    }
+  }
+
+  MPI_Bcast(&m,1,MPI_INT,0,uworld);
+  if (m == 0) return 1;
+  MPI_Bcast(buf,m,MPI_CHAR,0,uworld);
+  return 0;
+}
+
 /* ----------------------------------------------------------------------
    realloc the size of the send buffer as needed with BUFFACTOR and bufextra
    if flag = 1, realloc
diff --git a/src/comm.h b/src/comm.h
index 2dfda26d75..e667ba2c32 100644
--- a/src/comm.h
+++ b/src/comm.h
@@ -66,6 +66,7 @@ class Comm : protected Pointers {
   void ring(int, int, void *, int, void (*)(int, char *),   // ring comm
             void *, int self = 1);
   int read_lines_from_file(FILE *, int, int, char *);  // read/bcast file lines
+  int read_lines_from_file_universe(FILE *, int, int, char *);  
 
   virtual void set(int, char **);         // set communication style
   void set_processors(int, char **);      // set 3d processor grid attributes