Add check for swprintf() and a workaround when it is missing

We use this function once in our codebase, but fortunately the workaround is
relatively easy. swprintf() is not available on Cygwin so the compile failed
there, but we can do a series of mbstowcs() calls that produce the same end
result as the swprintf() call.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/pacman/callback.c b/src/pacman/callback.c
index 01e65a95..a7686483 100644
--- a/src/pacman/callback.c
+++ b/src/pacman/callback.c
@@ -393,7 +393,17 @@ void cb_trans_progress(pmtransprog_t event, const char *pkgname, int percent,
 	len = strlen(opr) + ((pkgname) ? strlen(pkgname) : 0) + 2;
 	wcstr = calloc(len, sizeof(wchar_t));
 	/* print our strings to the alloc'ed memory */
+#if defined(HAVE_SWPRINTF)
 	wclen = swprintf(wcstr, len, L"%s %s", opr, pkgname);
+#else
+	/* because the format string was simple, we can easily do this without
+	 * using swprintf, although it is probably not as safe/fast. The max
+	 * chars we can copy is decremented each time by subtracting the length
+	 * of the already printed/copied wide char string. */
+	wclen = mbstowcs(wcstr, opr, len);
+	wclen += mbstowcs(wcstr + wclen, " ", len - wclen);
+	wclen += mbstowcs(wcstr + wclen, pkgname, len - wclen);
+#endif
 	wcwid = wcswidth(wcstr, wclen);
 	padwid = textlen - wcwid;
 	/* if padwid is < 0, we need to trim the string so padwid = 0 */