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/usr/include/postfix/name_code.h is in postfix-dev 2.11.3-1+deb8u2.

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#ifndef _NAME_CODE_H_INCLUDED_
#define _NAME_CODE_H_INCLUDED_

/*++
/* NAME
/*	name_mask 3h
/* SUMMARY
/*	name to number table mapping
/* SYNOPSIS
/*	#include <name_code.h>
/* DESCRIPTION
/* .nf

 /*
  * External interface.
  */
typedef struct {
    const char *name;
    int     code;
} NAME_CODE;

#define NAME_CODE_FLAG_NONE		0
#define NAME_CODE_FLAG_STRICT_CASE	(1<<0)

extern int name_code(const NAME_CODE *, int, const char *);
extern const char *str_name_code(const NAME_CODE *, int);

/* LICENSE
/* .ad
/* .fi
/*	The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/*	Wietse Venema
/*	IBM T.J. Watson Research
/*	P.O. Box 704
/*	Yorktown Heights, NY 10598, USA
/*--*/

#endif