quotearg: add quotearg_n_style_colon()

This quotes with default options of the specified style,
but with quoting enabled for instances of ':'.

While this can be simulated by temporarily modifying
the default quoting style, this is a little awkward,
and care must be taken with such an implementation
to avoid inlining leading to bloated text.

* lib/quotearg.h (quotearg_n_style_colon): Description and declaration.
* lib/quotearg.c (quotearg_n_style_colon): New function implementation.

2 files changed, 12 insertions, 0 deletions

diff --git a/lib/quotearg.c b/lib/quotearg.c
index 8505081507..a0a0e2565c 100644
--- a/lib/quotearg.c
+++ b/lib/quotearg.c
@@ -955,6 +955,15 @@ quotearg_colon_mem (char const *arg, size_t argsize)
 }
 
 char *
+quotearg_n_style_colon (int n, enum quoting_style s, char const *arg)
+{
+  struct quoting_options options;
+  options = quoting_options_from_style (s);
+  set_char_quoting (&options, ':', 1);
+  return quotearg_n_options (n, arg, SIZE_MAX, &options);
+}
+
+char *
 quotearg_n_custom (int n, char const *left_quote,
                    char const *right_quote, char const *arg)
 {
diff --git a/lib/quotearg.h b/lib/quotearg.h
index edee3b5929..b9eb31d9f3 100644
--- a/lib/quotearg.h
+++ b/lib/quotearg.h
@@ -393,6 +393,9 @@ char *quotearg_colon (char const *arg);
 /* Like quotearg_colon (ARG), except it can quote null bytes.  */
 char *quotearg_colon_mem (char const *arg, size_t argsize);
 
+/* Like quotearg_n_style, except with ':' quoting enabled.  */
+char *quotearg_n_style_colon (int n, enum quoting_style s, char const *arg);
+
 /* Like quotearg_n_style (N, S, ARG) but with S as custom_quoting_style
    with left quote as LEFT_QUOTE and right quote as RIGHT_QUOTE.  See
    set_custom_quoting for a description of acceptable LEFT_QUOTE and