use this to analyze the memory debug logs MALLOCDEBUG will generate

memanalyze.pl

+#!/usr/bin/perl
+#
+# Example input:
+#
+# MEM mprintf.c:1094 malloc(32) = e5718
+# MEM mprintf.c:1103 realloc(e5718, 64) = e6118
+# MEM mprintf.c:1103 realloc(e6118, 128) = e6118
+# MEM url.c:268 malloc(52208) = e6288
+# MEM url.c:276 malloc(256) = f2e80
+# MEM url.c:692 malloc(4520) = f2f88
+# MEM hostip.c:122 malloc(9000) = f4138
+# MEM mprintf.c:1094 malloc(32) = e5740
+# MEM sendf.c:254 malloc(394) = f6628
+# MEM sendf.c:232 free(f6520)
+# MEM sendf.c:211 free(f6628)
+
+do {
+    if($ARGV[0] eq "-v") {
+        $verbose=1;
+    }
+} while (shift @ARGV);
+
+
+while(<STDIN>) {
+    chomp $_;
+    $line = $_;
+    if($verbose) {
+        print "IN: $line\n";
+    }
+    if($line =~ /^MEM ([^:]*):(\d*) (.*)/) {
+        # generic match for the filename+linenumber
+        $source = $1;
+        $linenum = $2;
+        $function = $3;
+
+        if($function =~ /free\(([0-9a-f]*)/) {
+            $addr = $1;
+            if($sizeataddr{$addr} <= 0) {
+                print "FREE ERROR: No memory allocated: $line\n";
+            }
+            else {
+                $totalmem -= $sizeataddr{$addr};
+                $sizeataddr{$addr}=0;
+                $getmem{$addr}=""; # forget after a good free()
+            }
+        }
+        elsif($function =~ /malloc\((\d*)\) = ([0-9a-f]*)/) {
+            $size = $1;
+            $addr = $2;
+            $sizeataddr{$addr}=$size;
+            $totalmem += $size;
+
+            $getmem{$addr}="$source:$linenum";
+        }
+        elsif($function =~ /realloc\(([0-9a-f]*), (\d*)\) = ([0-9a-f]*)/) {
+            $oldaddr = $1;
+            $newsize = $2;
+            $newaddr = $3;
+
+            $totalmem -= $sizeataddr{$oldaddr};
+            $sizeataddr{$oldaddr}=0;
+
+            $totalmem += $newsize;
+            $sizeataddr{$newaddr}=$newsize;
+
+            $getmem{$oldaddr}="";
+            $getmem{$newaddr}="$source:$linenum";
+        }
+        elsif($function =~ /strdup\(([0-9a-f]*)\) \((\d*)\) = ([0-9a-f]*)/) {
+            # strdup(a5b50) (8) = df7c0
+
+            $dup = $1;
+            $size = $2;
+            $addr = $3;
+            $getmem{$addr}="$source:$linenum";
+            $sizeataddr{$addr}=$size;
+
+            $totalmem += $size;
+        }
+        else {
+            print "Not recognized input line: $function\n";
+        }        
+    }
+    else {
+        print "Not recognized prefix line: $line\n";
+    }
+    if($verbose) {
+        print "TOTAL: $totalmem\n";
+    }
+}
+
+if(0 == $totalmem) {
+    print "No leak found\n";
+    exit;
+}
+
+print "Leak detected: memory still allocated: $totalmem bytes\n";
+
+for(keys %sizeataddr) {
+    $addr = $_;
+    $size = $sizeataddr{$addr};
+    if($size) {
+        print "At $addr, there's $size bytes.\n";
+        print " allocated by ".$getmem{$addr}."\n";
+    }
+}
+