1 files changed, 100 insertions, 0 deletions
diff --git a/jam-files/engine/command.c b/jam-files/engine/command.c
new file mode 100644
index 000000000..d2ea06814
--- /dev/null
+++ b/jam-files/engine/command.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright 1993, 1995 Christopher Seiwald.
+ *
+ * This file is part of Jam - see jam.c for Copyright information.
+ */
+
+/*  This file is ALSO:
+ *  Copyright 2001-2004 David Abrahams.
+ *  Distributed under the Boost Software License, Version 1.0.
+ *  (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+ */
+
+/*
+ * command.c - maintain lists of commands
+ */
+
+#include "jam.h"
+
+#include "lists.h"
+#include "parse.h"
+#include "variable.h"
+#include "rules.h"
+
+#include "command.h"
+#include <limits.h>
+#include <string.h>
+
+
+/*
+ * cmd_new() - return a new CMD or 0 if too many args
+ */
+
+CMD * cmd_new( RULE * rule, LIST * targets, LIST * sources, LIST * shell )
+{
+    CMD * cmd = (CMD *)BJAM_MALLOC( sizeof( CMD ) );
+    /* Lift line-length limitation entirely when JAMSHELL is just "%". */
+    int no_limit = ( shell && !strcmp(shell->string,"%") && !list_next(shell) );
+    int max_line = MAXLINE;
+    int allocated = -1;
+
+    cmd->rule = rule;
+    cmd->shell = shell;
+    cmd->next = 0;
+
+    lol_init( &cmd->args );
+    lol_add( &cmd->args, targets );
+    lol_add( &cmd->args, sources );
+    cmd->buf = 0;
+
+    do
+    {
+        BJAM_FREE( cmd->buf );  /* free any buffer from previous iteration */
+
+        cmd->buf = (char*)BJAM_MALLOC_ATOMIC( max_line + 1 );
+
+        if ( cmd->buf == 0 )
+            break;
+
+        allocated = var_string( rule->actions->command, cmd->buf, max_line, &cmd->args );
+
+        max_line = max_line * 2;
+    }
+    while ( ( allocated < 0 ) && ( max_line < INT_MAX / 2 ) );
+
+    if ( !no_limit )
+    {
+        /* Bail if the result will not fit in MAXLINE. */
+        char * s = cmd->buf;
+        while ( *s )
+        {
+            size_t l = strcspn( s, "\n" );
+
+            if ( l > MAXLINE )
+            {
+                /* We do not free targets/sources/shell if bailing. */
+                cmd_free( cmd );
+                return 0;
+            }
+
+            s += l;
+            if ( *s )
+                ++s;
+        }
+    }
+
+    return cmd;
+}
+
+
+/*
+ * cmd_free() - free a CMD
+ */
+
+void cmd_free( CMD * cmd )
+{
+    lol_free( &cmd->args );
+    list_free( cmd->shell );
+    BJAM_FREE( cmd->buf );
+    BJAM_FREE( (char *)cmd );
+}