--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dep/utf8proc/test/charwidth.c	Thu Jun 20 05:56:06 2024 -0400
@@ -0,0 +1,77 @@
+#include "tests.h"
+#include <ctype.h>
+#include <wchar.h>
+
+static int my_unassigned(int c) {
+    int cat = utf8proc_get_property(c)->category;
+    return (cat == UTF8PROC_CATEGORY_CN) || (cat == UTF8PROC_CATEGORY_CO);
+}
+
+static int my_isprint(int c) {
+    int cat = utf8proc_get_property(c)->category;
+    return (UTF8PROC_CATEGORY_LU <= cat && cat <= UTF8PROC_CATEGORY_ZS) ||
+           (c == 0x0601 || c == 0x0602 || c == 0x0603 || c == 0x06dd || c == 0x00ad) ||
+           (cat == UTF8PROC_CATEGORY_CN) || (cat == UTF8PROC_CATEGORY_CO);
+}
+
+int main(int argc, char **argv)
+{
+    int c, error = 0, updates = 0;
+
+    (void) argc; /* unused */
+    (void) argv; /* unused */
+
+    /* some simple sanity tests of the character widths */
+    for (c = 0; c <= 0x110000; ++c) {
+        int cat = utf8proc_get_property(c)->category;
+        int w = utf8proc_charwidth(c);
+        if ((cat == UTF8PROC_CATEGORY_MN || cat == UTF8PROC_CATEGORY_ME) && w > 0) {
+            fprintf(stderr, "nonzero width %d for combining char %x\n", w, c);
+            error += 1;
+        }
+        if (w == 0 &&
+            ((cat >= UTF8PROC_CATEGORY_LU && cat <= UTF8PROC_CATEGORY_LO) ||
+             (cat >= UTF8PROC_CATEGORY_ND && cat <= UTF8PROC_CATEGORY_SC) ||
+             (cat >= UTF8PROC_CATEGORY_SO && cat <= UTF8PROC_CATEGORY_ZS))) {
+            fprintf(stderr, "zero width for symbol-like char %x\n", c);
+            error += 1;
+        }
+        if (c <= 127 && ((!isprint(c) && w > 0) || (isprint(c) && wcwidth(c) != w))) {
+            fprintf(stderr, "wcwidth %d mismatch %d for %s ASCII %x\n",
+            wcwidth(c), w,
+            isprint(c) ? "printable" : "non-printable", c);
+            error += 1;
+        }
+        if (!my_isprint(c) && w > 0) {
+            fprintf(stderr, "non-printing %x had width %d\n", c, w);
+            error += 1;
+        }
+        if (my_unassigned(c) && w != 1) {
+            fprintf(stderr, "unexpected width %d for unassigned char %x\n", w, c);
+            error += 1;
+        }
+    }
+    check(!error, "utf8proc_charwidth FAILED %d tests.", error);
+
+    check(utf8proc_charwidth(0x00ad) == 1, "incorrect width for U+00AD (soft hyphen)");
+    check(utf8proc_charwidth(0xe000) == 1, "incorrect width for U+e000 (PUA)");
+
+    /* print some other information by compariing with system wcwidth */
+    printf("Mismatches with system wcwidth (not necessarily errors):\n");
+    for (c = 0; c <= 0x110000; ++c) {
+        int w = utf8proc_charwidth(c);
+        int wc = wcwidth(c);
+        if (sizeof(wchar_t) == 2 && c >= (1<<16)) continue;
+        /* lots of these errors for out-of-date system unicode tables */
+        if (wc == -1 && my_isprint(c) && !my_unassigned(c) && w > 0)
+            updates += 1;
+        if (wc == -1 && !my_isprint(c) && w > 0)
+            printf("  wcwidth(%x) = -1 for non-printable width-%d char\n", c, w);
+        if (wc >= 0 && wc != w)
+            printf("  wcwidth(%x) = %d != charwidth %d\n", c, wc, w);
+    }
+    printf("   ... (positive widths for %d chars unknown to wcwidth) ...\n", updates);
+    printf("Character-width tests SUCCEEDED.\n");
+
+    return 0;
+}