[util/hb-shape] Treat as single-paragraph text other than provided by a file

Fixes https://github.com/harfbuzz/harfbuzz/issues/3129

util/hb-shape.cc

@@ -187,11 +187,11 @@ main (int argc, char **argv)
 	start_offset = argc == 2 && p[0] != '\0' && p[0] != ':' && p[1] == ':' && (p[2] == '\\' || p[2] == '/') ? 2 : 0;
       }
 
-      ret |= main_func (argc, args, EOF);
+      ret |= main_func (argc, args);
       fflush (stdout);
     }
     return ret;
   }
 
-  return main_func (argc, argv, '\n');
+  return main_func (argc, argv);
 }

util/hb-subset.cc

@@ -155,7 +155,7 @@ main (int argc, char **argv)
 	args[argc++] = p = e;
       }
 
-      int result = main_func (argc, args, EOF);
+      int result = main_func (argc, args);
       fprintf (stdout, result == 0 ? "success\n" : "failure\n");
       fflush (stdout);
       ret |= result;
@@ -163,5 +163,5 @@ main (int argc, char **argv)
     return ret;
   }
 
-  return main_func (argc, argv, '\n');
+  return main_func (argc, argv);
 }

util/main-font-text.hh

@@ -33,7 +33,7 @@
 
 template <typename consumer_t, typename font_options_t, typename text_options_t>
 int
-main_font_text (int argc, char **argv, int eol = '\n')
+main_font_text (int argc, char **argv)
 {
 
   font_options_t font_opts;
@@ -60,7 +60,7 @@ main_font_text (int argc, char **argv, int eol = '\n')
 
   unsigned int text_len;
   const char *text;
-  while ((text = input.get_line (&text_len, eol)))
+  while ((text = input.get_line (&text_len)))
     consumer.consume_line (text, text_len, input.text_before, input.text_after);
 
   consumer.finish (&font_opts);

util/text-options.hh

@@ -23,7 +23,7 @@ struct text_options_t
 		   "Only one of text and text-file can be set");
   }
 
-  const char *get_line (unsigned int *len, int eol = '\n');
+  const char *get_line (unsigned int *len);
 
   char *text_before = nullptr;
   char *text_after = nullptr;
@@ -35,8 +35,6 @@ struct text_options_t
   private:
   FILE *fp = nullptr;
   GString *gs = nullptr;
-  char *line = nullptr;
-  unsigned int line_len = UINT_MAX;
 };
 
 
@@ -118,41 +116,22 @@ parse_unicodes (const char *name G_GNUC_UNUSED,
 }
 
 const char *
-text_options_t::get_line (unsigned int *len, int eol)
+text_options_t::get_line (unsigned int *len)
 {
   if (text)
   {
-    if (!line)
+    if (text_len == -2)
     {
-      line = text;
-      line_len = text_len;
-    }
-    if (line_len == UINT_MAX)
-      line_len = strlen (line);
-
-    if (!line_len) {
       *len = 0;
       return nullptr;
     }
 
-    const char *ret = line;
-    const char *p = (const char *) memchr (line, eol, line_len);
-    unsigned int ret_len;
-    if (!p)
-    {
-      ret_len = line_len;
-      line += ret_len;
-      line_len = 0;
-    }
-    else
-    {
-      ret_len = p - ret;
-      line += ret_len + 1;
-      line_len -= ret_len + 1;
-    }
+    if (text_len == -1)
+      text_len = strlen (text);
 
-    *len = ret_len;
-    return ret;
+    *len = text_len;
+    text_len = -2;
+    return text;
   }
 
   if (!fp)
@@ -177,7 +156,7 @@ text_options_t::get_line (unsigned int *len, int eol)
   while (fgets (buf, sizeof (buf), fp))
   {
     unsigned bytes = strlen (buf);
-    if (bytes && (int) (unsigned char) buf[bytes - 1] == eol)
+    if (bytes && buf[bytes - 1] == '\n')
     {
       bytes--;
       g_string_append_len (gs, buf, bytes);