/*	$NetBSD: mail_conf_nint.c,v 1.2 2020/03/18 19:05:16 christos Exp $	*/

/*++
/* NAME
/*	mail_conf_nint 3
/* SUMMARY
/*	integer-valued configuration parameter support
/* SYNOPSIS
/*	#include <mail_conf.h>
/*
/*	int	get_mail_conf_nint(name, defval, min, max);
/*	const char *name;
/*	const char *defval;
/*	int	min;
/*	int	max;
/*
/*	int	get_mail_conf_nint_fn(name, defval, min, max);
/*	const char *name;
/*	char	*(*defval)();
/*	int	min;
/*	int	max;
/*
/*	void	set_mail_conf_nint(name, value)
/*	const char *name;
/*	const char *value;
/*
/*	void	set_mail_conf_nint_int(name, value)
/*	const char *name;
/*	int	value;
/*
/*	void	get_mail_conf_nint_table(table)
/*	const CONFIG_NINT_TABLE *table;
/*
/*	void	get_mail_conf_nint_fn_table(table)
/*	const CONFIG_NINT_TABLE *table;
/* AUXILIARY FUNCTIONS
/*	int	get_mail_conf_nint2(name1, name2, defval, min, max);
/*	const char *name1;
/*	const char *name2;
/*	int	defval;
/*	int	min;
/*	int	max;
/* DESCRIPTION
/*	This module implements configuration parameter support
/*	for integer values. Unlike mail_conf_int, the default
/*	is a string, which can be subjected to macro expansion.
/*
/*	get_mail_conf_nint() looks up the named entry in the global
/*	configuration dictionary. The default value is returned
/*	when no value was found.
/*	\fImin\fR is zero or specifies a lower limit on the integer
/*	value or string length; \fImax\fR is zero or specifies an
/*	upper limit on the integer value or string length.
/*
/*	get_mail_conf_nint_fn() is similar but specifies a function that
/*	provides the default value. The function is called only
/*	when the default value is needed.
/*
/*	set_mail_conf_nint() updates the named entry in the global
/*	configuration dictionary. This has no effect on values that
/*	have been looked up earlier via the get_mail_conf_XXX() routines.
/*
/*	get_mail_conf_nint_table() and get_mail_conf_nint_fn_table() initialize
/*	lists of variables, as directed by their table arguments. A table
/*	must be terminated by a null entry.
/*
/*	get_mail_conf_nint2() concatenates the two names and is otherwise
/*	identical to get_mail_conf_nint().
/* DIAGNOSTICS
/*	Fatal errors: malformed numerical value.
/* SEE ALSO
/*	config(3) general configuration
/*	mail_conf_str(3) string-valued configuration parameters
/* 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
/*
/*	Wietse Venema
/*	Google, Inc.
/*	111 8th Avenue
/*	New York, NY 10011, USA
/*--*/

/* System library. */

#include <sys_defs.h>
#include <stdlib.h>
#include <stdio.h>			/* BUFSIZ */
#include <errno.h>

/* Utility library. */

#include <msg.h>
#include <mymalloc.h>
#include <dict.h>
#include <stringops.h>

/* Global library. */

#include "mail_conf.h"

/* convert_mail_conf_nint - look up and convert integer parameter value */

static int convert_mail_conf_nint(const char *name, int *intval)
{
    const char *strval;
    char   *end;
    long    longval;

    if ((strval = mail_conf_lookup_eval(name)) != 0) {
	errno = 0;
	*intval = longval = strtol(strval, &end, 10);
	if (*strval == 0 || *end != 0 || errno == ERANGE || longval != *intval)
	    msg_fatal("bad numerical configuration: %s = %s", name, strval);
	return (1);
    }
    return (0);
}

/* check_mail_conf_nint - validate integer value */

static void check_mail_conf_nint(const char *name, int intval, int min, int max)
{
    if (min && intval < min)
	msg_fatal("invalid %s parameter value %d < %d", name, intval, min);
    if (max && intval > max)
	msg_fatal("invalid %s parameter value %d > %d", name, intval, max);
}

/* get_mail_conf_nint - evaluate integer-valued configuration variable */

int     get_mail_conf_nint(const char *name, const char *defval, int min, int max)
{
    int     intval;

    if (convert_mail_conf_nint(name, &intval) == 0)
	set_mail_conf_nint(name, defval);
    if (convert_mail_conf_nint(name, &intval) == 0)
	msg_panic("get_mail_conf_nint: parameter not found: %s", name);
    check_mail_conf_nint(name, intval, min, max);
    return (intval);
}

/* get_mail_conf_nint2 - evaluate integer-valued configuration variable */

int     get_mail_conf_nint2(const char *name1, const char *name2, int defval,
			            int min, int max)
{
    int     intval;
    char   *name;

    name = concatenate(name1, name2, (char *) 0);
    if (convert_mail_conf_nint(name, &intval) == 0)
	set_mail_conf_nint_int(name, defval);
    if (convert_mail_conf_nint(name, &intval) == 0)
	msg_panic("get_mail_conf_nint2: parameter not found: %s", name);
    check_mail_conf_nint(name, intval, min, max);
    myfree(name);
    return (intval);
}

/* get_mail_conf_nint_fn - evaluate integer-valued configuration variable */

typedef const char *(*stupid_indent_int) (void);

int     get_mail_conf_nint_fn(const char *name, stupid_indent_int defval,
			              int min, int max)
{
    int     intval;

    if (convert_mail_conf_nint(name, &intval) == 0)
	set_mail_conf_nint(name, defval());
    if (convert_mail_conf_nint(name, &intval) == 0)
	msg_panic("get_mail_conf_nint_fn: parameter not found: %s", name);
    check_mail_conf_nint(name, intval, min, max);
    return (intval);
}

/* set_mail_conf_nint - update integer-valued configuration dictionary entry */

void    set_mail_conf_nint(const char *name, const char *value)
{
    mail_conf_update(name, value);
}

/* set_mail_conf_nint_int - update integer-valued configuration dictionary entry */

void    set_mail_conf_nint_int(const char *name, int value)
{
    const char myname[] = "set_mail_conf_nint_int";
    char    buf[BUFSIZ];		/* yeah! crappy code! */

#ifndef NO_SNPRINTF
    ssize_t ret;

    ret = snprintf(buf, sizeof(buf), "%d", value);
    if (ret < 0)
	msg_panic("%s: output error for %%d", myname);
    if (ret >= sizeof(buf))
	msg_panic("%s: output for %%d exceeds space %ld",
		  myname, (long) sizeof(buf));
#else
    sprintf(buf, "%d", value);			/* yeah! more crappy code! */
#endif
    mail_conf_update(name, buf);
}

/* get_mail_conf_nint_table - look up table of integers */

void    get_mail_conf_nint_table(const CONFIG_NINT_TABLE *table)
{
    while (table->name) {
	table->target[0] = get_mail_conf_nint(table->name, table->defval,
					      table->min, table->max);
	table++;
    }
}

/* get_mail_conf_nint_fn_table - look up integers, defaults are functions */

void    get_mail_conf_nint_fn_table(const CONFIG_NINT_FN_TABLE *table)
{
    while (table->name) {
	table->target[0] = get_mail_conf_nint_fn(table->name, table->defval,
						 table->min, table->max);
	table++;
    }
}