+/* Equivalent to quotearg_alloc (ARG, ARGSIZE, NULL, O). */
+char *
+quotearg_alloc (char const *arg, size_t argsize,
+ struct quoting_options const *o)
+{
+ return quotearg_alloc_mem (arg, argsize, NULL, o);
+}
+
+/* Like quotearg_buffer (..., ARG, ARGSIZE, O), except return newly
+ allocated storage containing the quoted string, and store the
+ resulting size into *SIZE, if non-NULL. The result can contain
+ embedded null bytes only if ARGSIZE is not SIZE_MAX, SIZE is not
+ NULL, and set_quoting_flags has not set the null byte elision
+ flag. */
+char *
+quotearg_alloc_mem (char const *arg, size_t argsize, size_t *size,
+ struct quoting_options const *o)
+{
+ struct quoting_options const *p = o ? o : &default_quoting_options;
+ int e = errno;
+ /* Elide embedded null bytes if we can't return a size. */
+ int flags = p->flags | (size ? 0 : QA_ELIDE_NULL_BYTES);
+ size_t bufsize = quotearg_buffer_restyled (0, 0, arg, argsize, p->style,
+ flags, p->quote_these_too) + 1;
+ char *buf = xcharalloc (bufsize);
+ quotearg_buffer_restyled (buf, bufsize, arg, argsize, p->style, flags,
+ p->quote_these_too);
+ errno = e;
+ if (size)
+ *size = bufsize - 1;
+ return buf;
+}
+
+/* A storage slot with size and pointer to a value. */
+struct slotvec
+{
+ size_t size;
+ char *val;
+};
+
+/* Preallocate a slot 0 buffer, so that the caller can always quote
+ one small component of a "memory exhausted" message in slot 0. */
+static char slot0[256];
+static unsigned int nslots = 1;
+static struct slotvec slotvec0 = {sizeof slot0, slot0};
+static struct slotvec *slotvec = &slotvec0;
+
+void
+quotearg_free (void)
+{
+ struct slotvec *sv = slotvec;
+ unsigned int i;
+ for (i = 1; i < nslots; i++)
+ free (sv[i].val);
+ if (sv[0].val != slot0)
+ {
+ free (sv[0].val);
+ slotvec0.size = sizeof slot0;
+ slotvec0.val = slot0;
+ }
+ if (sv != &slotvec0)
+ {
+ free (sv);
+ slotvec = &slotvec0;
+ }
+ nslots = 1;
+}
+