1 files changed, 132 insertions, 0 deletions
diff --git a/lib/sh/shmatch.c b/lib/sh/shmatch.c
new file mode 100644
index 0000000..a717d45
--- /dev/null
+++ b/lib/sh/shmatch.c
@@ -0,0 +1,132 @@
+/*
+ * shmatch.c -- shell interface to posix regular expression matching.
+ */
+
+/* Copyright (C) 2003-2022 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Bash is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#if defined (HAVE_POSIX_REGEXP)
+
+#ifdef HAVE_UNISTD_H
+#  include <unistd.h>
+#endif
+
+#include "bashansi.h"
+
+#include <stdio.h>
+#include <regex.h>
+
+#include "shell.h"
+#include "variables.h"
+#include "externs.h"
+
+extern int glob_ignore_case, match_ignore_case;
+
+#if defined (ARRAY_VARS)
+extern SHELL_VAR *builtin_find_indexed_array (char *, int);
+#endif
+
+int
+sh_regmatch (string, pattern, flags)
+     const char *string;
+     const char *pattern;
+     int flags;
+{
+  regex_t regex = { 0 };
+  regmatch_t *matches;
+  int rflags;
+#if defined (ARRAY_VARS)
+  SHELL_VAR *rematch;
+  ARRAY *amatch;
+  int subexp_ind;
+  char *subexp_str;
+  int subexp_len;
+#endif
+  int result;
+
+#if defined (ARRAY_VARS)
+  rematch = (SHELL_VAR *)NULL;
+#endif
+
+  rflags = REG_EXTENDED;
+  if (match_ignore_case)
+    rflags |= REG_ICASE;
+#if !defined (ARRAY_VARS)
+  rflags |= REG_NOSUB;
+#endif
+
+  if (regcomp (&regex, pattern, rflags))
+    return 2;		/* flag for printing a warning here. */
+
+#if defined (ARRAY_VARS)
+  matches = (regmatch_t *)malloc (sizeof (regmatch_t) * (regex.re_nsub + 1));
+#else
+  matches = NULL;
+#endif
+
+  /* man regexec: NULL PMATCH ignored if NMATCH == 0 */
+  if (regexec (&regex, string, matches ? regex.re_nsub + 1 : 0, matches, 0))
+    result = EXECUTION_FAILURE;
+  else
+    result = EXECUTION_SUCCESS;		/* match */
+
+#if defined (ARRAY_VARS)
+  subexp_len = strlen (string) + 10;
+  subexp_str = malloc (subexp_len + 1);
+
+  /* Store the parenthesized subexpressions in the array BASH_REMATCH.
+     Element 0 is the portion that matched the entire regexp.  Element 1
+     is the part that matched the first subexpression, and so on. */
+#if 1
+  unbind_global_variable_noref ("BASH_REMATCH");
+  rematch = make_new_array_variable ("BASH_REMATCH");
+#else
+  /* TAG:bash-5.3 */
+  rematch = builtin_find_indexed_array ("BASH_REMATCH", 1);
+#endif
+  amatch = rematch ? array_cell (rematch) : (ARRAY *)0;
+
+  if (matches && amatch && (flags & SHMAT_SUBEXP) && result == EXECUTION_SUCCESS && subexp_str)
+    {
+      for (subexp_ind = 0; subexp_ind <= regex.re_nsub; subexp_ind++)
+	{
+	  memset (subexp_str, 0, subexp_len);
+	  strncpy (subexp_str, string + matches[subexp_ind].rm_so,
+		     matches[subexp_ind].rm_eo - matches[subexp_ind].rm_so);
+	  array_insert (amatch, subexp_ind, subexp_str);
+	}
+    }
+
+#if 0
+  VSETATTR (rematch, att_readonly);
+#endif
+
+  free (subexp_str);
+  free (matches);
+#endif /* ARRAY_VARS */
+
+  regfree (&regex);
+
+  return result;
+}
+
+#endif /* HAVE_POSIX_REGEXP */