Pacify GCC 14 -Wstring-operflow in ftfont.c

* src/ftfont.c (ftfont_drive_otf): Do not crash if
spec->features[i] is nonnull but is empty.
Use gfeatures local to pacify GCC 14.

(cherry picked from commit 59a11116e013fb123ba074da9bca373c1aa03367)

diff --git a/src/ftfont.c b/src/ftfont.c
index 0d10de5408f398818ffd4ede7564aa08c32c18d6..2e37b62ea35bbb7e0466947c43299f6e4346af40 100644 (file)
--- a/src/ftfont.c
+++ b/src/ftfont.c
@@ -2030,7 +2030,6 @@ ftfont_drive_otf (MFLTFont *font,
   int i, j, gidx;
   OTF_Glyph *otfg;
   char script[5], *langsys = NULL;
-  char *gsub_features = NULL, *gpos_features = NULL;
   OTF_Feature *features;
 
   if (len == 0)
@@ -2044,6 +2043,7 @@ ftfont_drive_otf (MFLTFont *font,
       OTF_tag_name (spec->langsys, langsys);
     }
 
+  char *gfeatures[2] = {NULL, NULL};
   USE_SAFE_ALLOCA;
   for (i = 0; i < 2; i++)
     {
@@ -2052,11 +2052,10 @@ ftfont_drive_otf (MFLTFont *font,
       if (spec->features[i] && spec->features[i][1] != 0xFFFFFFFF)
        {
          for (j = 0; spec->features[i][j]; j++);
+         if (j == 0)
+           continue;
          SAFE_NALLOCA (p, 6, j);
-         if (i == 0)
-           gsub_features = p;
-         else
-           gpos_features = p;
+         gfeatures[i] = p;
          for (j = 0; spec->features[i][j]; j++)
            {
              if (spec->features[i][j] == 0xFFFFFFFF)
@@ -2071,6 +2070,7 @@ ftfont_drive_otf (MFLTFont *font,
          *--p = '\0';
        }
     }
+  char *gsub_features = gfeatures[0], *gpos_features = gfeatures[1];
 
   setup_otf_gstring (len);
   for (i = 0; i < len; i++)