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diff --git a/include/argot/lex.h b/include/argot/lex.h
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+/* argot - Gray's Extensible Configuration System -*- c -*-
+ Copyright (C) 2007-2016 Sergey Poznyakoff
+
+ Grecs 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.
+
+ Grecs 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 Grecs. If not, see <http://www.gnu.org/licenses/>. */
+
+#ifndef _ARGOT_LEX_H
+#define _ARGOT_LEX_H
+
+int argot_lex_begin(const char*, int);
+void argot_lex_end(int err);
+
+char *argot_install_text(const char *str);
+void argot_destroy_text(void);
+struct argot_symtab *argot_text_table(void);
+
+void argot_parse_line_directive(char *text, argot_locus_t *ploc,
+ struct argot_locus_point *ppoint,
+ size_t *pxlines);
+void argot_parse_line_directive_cpp(char *text, argot_locus_t *ploc,
+ struct argot_locus_point *ppoint,
+ size_t *pxlines);
+
+void argot_line_acc_create(void);
+void argot_line_acc_free(void);
+void argot_line_acc_grow_char(int c);
+int argot_line_acc_grow_char_unescape(int c);
+void argot_line_acc_grow(const char *text, size_t len);
+void argot_line_acc_grow_unescape_last(char *text, size_t len,
+ argot_locus_t const *loc);
+
+void argot_line_begin(void);
+#define argot_line_add argot_line_acc_grow
+char *argot_line_finish(void);
+
+int argot_str_is_ipv4(const char *addr);
+int argot_str_is_num(const char *s);
+int argot_str_is_ipv6(const char *addr);
+int argot_str_is_num(const char *s);
+int argot_str_is_ipaddr(const char *addr);
+
+#endif

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