Keep installed headers from shadowing or polluting host names

The pkg-config file put include/term on the host's include path, so
ncurses' term.h could be picked up in place of ours. Hosts now write
<term/term.h> and the package adds only its include directory.

The installed Unicode API had unprefixed names that collide with host
symbols and macros. Rename them: term_ for functions, types, and static
tables, TERM_ for macros and include guards. unicode_data.inc and
tools/generate_unicode.py are renamed to match. The generator's inputs
here are Unicode 15.1 and the checked-in table is 18.0.0, so the table
data was not regenerated. Only the declarations were checked against
the generator.

utf8.h casts the malloc result so it compiles as C++.

header_test.sh now includes <term/term.h> with only include/ on the path.
It also checks that a host which defines unicode_width, UTF8_ACCEPT,
GRAPHEME_MAX_LEN, in_ranges, and similar names compiles with the Unicode
headers as C11 and C++, in both declaration orders.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/include/term/unicode/grapheme.h b/include/term/unicode/grapheme.h
index 5573949..0946bb6 100644
--- a/include/term/unicode/grapheme.h
+++ b/include/term/unicode/grapheme.h
@@ -5,20 +5,20 @@
 #include <stddef.h>
 #include <stdint.h>
 
-#define GRAPHEME_MAX_LEN 20
-#define GRAPHEME_HANDLE_BASE 0x7F000000u
+#define TERM_GRAPHEME_MAX_LEN 20
+#define TERM_GRAPHEME_HANDLE_BASE 0x7F000000u
 
-static inline bool grapheme_is_handle(uint32_t c)
+static inline bool term_grapheme_is_handle(uint32_t c)
 {
-    return c >= GRAPHEME_HANDLE_BASE;
+    return c >= TERM_GRAPHEME_HANDLE_BASE;
 }
 
-static inline bool grapheme_regional_indicator(uint32_t cp)
+static inline bool term_grapheme_regional_indicator(uint32_t cp)
 {
     return cp >= 0x1F1E6 && cp <= 0x1F1FF;
 }
 
-static inline bool grapheme_emoji_modifier(uint32_t cp)
+static inline bool term_grapheme_emoji_modifier(uint32_t cp)
 {
     return cp >= 0x1F3FB && cp <= 0x1F3FF;
 }