From 3aa4215f72528d6f2ac3fc5830c68d5105491d71 Mon Sep 17 00:00:00 2001
From: andrewfish <andrewfish@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Fri, 5 Feb 2010 18:43:49 +0000
Subject: Update so Windows build works like Cygwin buid

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9940 6f19259b-4bc3-4df7-8a09-765794883524
---
 BeagleBoardPkg/Tools/replace.c | 35 +++++++++++++++++++++++++++++------
 1 file changed, 29 insertions(+), 6 deletions(-)

(limited to 'BeagleBoardPkg/Tools/replace.c')

diff --git a/BeagleBoardPkg/Tools/replace.c b/BeagleBoardPkg/Tools/replace.c
index d26d127481..8e09d9a6a1 100755
--- a/BeagleBoardPkg/Tools/replace.c
+++ b/BeagleBoardPkg/Tools/replace.c
@@ -26,6 +26,16 @@ typedef struct {
   char  *Replace;
 } MATCH_PAIR;
 
+void
+Usage (char *Name)
+{
+  printf ("\n%s OldFile NewFile MatchString ReplaceString [MatchString2 ReplaceString2]*\n", Name);
+  printf ("    OldFile - Must be arg[1] File to search for MatchStrings\n");
+  printf ("    NewFile - Must be arg[2] File where MatchString has been replaced with ReplaceString\n");
+  printf ("    MatchString & ReplaceString. Required arguments.\n");
+  printf ("    More MatchString/ReplaceString pairs are supported.\n");
+}
+
 //
 // argv[1] - Old File
 // argv[2] - New File
@@ -44,10 +54,11 @@ main (int argc, char **argv)
   int Found;
 
   if (argc < 5) {
-    // Need at least two files and two strings
+    fprintf (stderr, "Need at least two files and one Match/Replacement string pair\n");
+    Usage (argv[0]);
     return -1;
   } else if ((argc % 2) == 0) {
-    // Match and Replace string must come in pairs
+    fprintf (stderr, "Match and Replace string must come in pairs\n");
     return -4;
   }
 
@@ -55,6 +66,7 @@ main (int argc, char **argv)
   fseek (In, 0, SEEK_END);
   InFileSize = ftell (In);
   if (InFileSize == 0) {
+    fprintf (stderr, "Could not open %s\n", argv[1]);
     return -6;
   }
   fseek (In, 0, SEEK_SET);
@@ -62,11 +74,11 @@ main (int argc, char **argv)
 
   Out = fopen (argv[2], "w+");
   if ((In == NULL) || (Out == NULL)) {
+    fprintf (stderr, "Could not open %s\n", argv[2]);
     return -2;
   }
 
   MaxMatch = (argc - 2)/2;
-  printf ("\nMaxMatch = %d:%d\n", MaxMatch, argc);
   Match = calloc (MaxMatch, sizeof (MATCH_PAIR));
   if (Match == NULL) {
     return -7;
@@ -76,7 +88,6 @@ main (int argc, char **argv)
     Match[n].Match   = argv[3 + n*2];
     Match[n].MatchSize = strlen (argv[3 + n*2]);
     Match[n].Replace = argv[3 + n*2 + 1];
-printf ("%s > %s\n", Match[n].Match, Match[n].Replace);
     if (Match[n].MatchSize > MaxLenKey) {
       // Max size of match/replace string pair
       MaxLenKey = Match[n].MatchSize;
@@ -91,6 +102,13 @@ printf ("%s > %s\n", Match[n].Match, Match[n].Replace);
     return -5;
   }
 
+  // Search for a match by reading every possition of the file
+  // into a buffer that is as big as the maximum search key size.
+  // Then we can search the keys for a match. If no match
+  // copy the old file character to the new file. If it is a match
+  // then copy the replacement string into the output file. 
+  // This code assumes the file system is smart and caches the 
+  // file in a buffer. So all the reads don't really hit the disk. 
   InFilePos = 0;
   while (InFilePos < (InFileSize - MinLenKey)) {
     fseek (In, InFilePos, SEEK_SET);
@@ -98,9 +116,7 @@ printf ("%s > %s\n", Match[n].Match, Match[n].Replace);
     for (i = 0, Found = FALSE;i < MaxMatch; i++) {
       if (ReadCount >= Match[i].MatchSize) {
         if (!memcmp (Key, Match[i].Match, Match[i].MatchSize)) {
-          printf ("Found [%s] @ %u\n", Match[i].Match, InFilePos);
           InFilePos += (Match[i].MatchSize - 1);
-          printf ("InFilePos = %u", InFilePos);
           fputs (Match[i].Replace, Out);
           Found = TRUE;
           break;
@@ -114,10 +130,17 @@ printf ("%s > %s\n", Match[n].Match, Match[n].Replace);
     InFilePos++;
   }
 
+  // We stoped searching when we got to the point that we could no longer match.
+  // So the last few bytes of the file are not copied in the privous loop
+  fseek (In, InFilePos, SEEK_SET);
+  while ((c = fgetc (In)) != EOF) {
+    fputc (c, Out);
+  }
  
   fclose (In);
   fclose (Out);
   free (Key);
+  free (Match);
   return 0;
 }
 
-- 
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