chore: import upstream snapshot with attribution

vendored/tre/regerror.c

@@ -0,0 +1,86 @@
+/*
+  tre_regerror.c - POSIX tre_regerror() implementation for TRE.
+
+  This software is released under a BSD-style license.
+  See the file LICENSE for details and copyright.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <string.h>
+#ifdef HAVE_WCHAR_H
+#include <wchar.h>
+#endif /* HAVE_WCHAR_H */
+#ifdef HAVE_WCTYPE_H
+#include <wctype.h>
+#endif /* HAVE_WCTYPE_H */
+
+#include "tre-internal.h"
+
+#ifdef HAVE_GETTEXT
+#include <libintl.h>
+#else
+#define dgettext(p, s) s
+#define gettext(s) s
+#endif
+
+#define _(String) dgettext(PACKAGE, String)
+#define gettext_noop(String) String
+
+#define xstr(s) str(s)
+#define str(s) #s
+
+/* Error message strings for error codes listed in `tre.h'.  This list
+   needs to be in sync with the codes listed there, naturally. */
+static const char *tre_error_messages[] =
+  { gettext_noop("No error"),							/* REG_OK */
+    gettext_noop("No match"),							/* REG_NOMATCH */
+    gettext_noop("Invalid regexp"),						/* REG_BADPAT */
+    gettext_noop("Unknown collating element"),					/* REG_ECOLLATE */
+    gettext_noop("Unknown character class name"),				/* REG_ECTYPE */
+    gettext_noop("Trailing backslash"),						/* REG_EESCAPE */
+    gettext_noop("Invalid back reference"),					/* REG_ESUBREG */
+    gettext_noop("Missing ']'"),						/* REG_EBRACK */
+    gettext_noop("Missing ')'"),						/* REG_EPAREN */
+    gettext_noop("Missing '}'"),						/* REG_EBRACE */
+    gettext_noop("Invalid contents of {}"),					/* REG_BADBR */
+    gettext_noop("Invalid character range"),					/* REG_ERANGE */
+    gettext_noop("Out of memory"),						/* REG_ESPACE */
+    gettext_noop("Invalid use of repetition operators"),			/* REG_BADRPT */
+    gettext_noop("Maximum repetition in {} larger than " xstr(RE_DUP_MAX)),	/* REG_BADMAX */
+  };
+
+size_t
+tre_regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
+{
+  const char *err;
+  size_t err_len;
+
+  /*LINTED*/(void)&preg;
+  if (errcode >= 0
+      && errcode < (int)(sizeof(tre_error_messages)
+			 / sizeof(*tre_error_messages)))
+    err = gettext(tre_error_messages[errcode]);
+  else
+    err = gettext("Unknown error");
+
+  err_len = strlen(err) + 1;
+  if (errbuf_size > 0 && errbuf != NULL)
+    {
+      if (err_len > errbuf_size)
+	{
+	  strncpy(errbuf, err, errbuf_size - 1);
+	  errbuf[errbuf_size - 1] = '\0';
+	}
+      else
+	{
+	  strcpy(errbuf, err);
+	}
+    }
+  return err_len;
+}
+
+/* EOF */