Virgin import of diffutils 2.8.7.

1 files changed, 125 insertions, 0 deletions

diff --git a/contrib/diff/lib/quotesys.c b/contrib/diff/lib/quotesys.c
new file mode 100644
index 0000000..528f382
--- /dev/null
+++ b/contrib/diff/lib/quotesys.c
@@ -0,0 +1,125 @@
+/* Shell command argument quoting.
+   Copyright (C) 1994, 1995, 1997 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; see the file COPYING.
+   If not, write to the Free Software Foundation,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* Written by Paul Eggert <eggert@twinsun.com> */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <quotesys.h>
+
+/* Place into QUOTED a quoted version of ARG suitable for `system'.
+   Return the length of the resulting string (which is not null-terminated).
+   If QUOTED is null, return the length without any side effects.  */
+
+size_t
+quote_system_arg (quoted, arg)
+     char *quoted;
+     char const *arg;
+{
+  char const *a;
+  size_t len = 0;
+
+  /* Scan ARG, copying it to QUOTED if QUOTED is not null,
+     looking for shell metacharacters.  */
+
+  for (a = arg; ; a++)
+    {
+      char c = *a;
+      switch (c)
+	{
+	case 0:
+	  /* ARG has no shell metacharacters.  */
+	  return len;
+
+	case '=':
+	  if (*arg == '-')
+	    break;
+	  /* Fall through.  */
+	case '\t': case '\n': case ' ':
+	case '!': case '"': case '#': case '$': case '%': case '&': case '\'':
+	case '(': case ')': case '*': case ';':
+	case '<': case '>': case '?': case '[': case '\\':
+	case '^': case '`': case '|': case '~':
+	  {
+	    /* ARG has a shell metacharacter.
+	       Start over, quoting it this time.  */
+
+	    len = 0;
+	    c = *arg++;
+
+	    /* If ARG is an option, quote just its argument.
+	       This is not necessary, but it looks nicer.  */
+	    if (c == '-'  &&  arg < a)
+	      {
+		c = *arg++;
+
+		if (quoted)
+		  {
+		    quoted[len] = '-';
+		    quoted[len + 1] = c;
+		  }
+		len += 2;
+
+		if (c == '-')
+		  while (arg < a)
+		    {
+		      c = *arg++;
+		      if (quoted)
+			quoted[len] = c;
+		      len++;
+		      if (c == '=')
+			break;
+		    }
+		c = *arg++;
+	      }
+
+	    if (quoted)
+	      quoted[len] = '\'';
+	    len++;
+
+	    for (;  c;  c = *arg++)
+	      {
+		if (c == '\'')
+		  {
+		    if (quoted)
+		      {
+			quoted[len] = '\'';
+			quoted[len + 1] = '\\';
+			quoted[len + 2] = '\'';
+		      }
+		    len += 3;
+		  }
+		if (quoted)
+		  quoted[len] = c;
+		len++;
+	      }
+
+	    if (quoted)
+	      quoted[len] = '\'';
+	    return len + 1;
+	  }
+	}
+
+      if (quoted)
+	quoted[len] = c;
+      len++;
+    }
+}