1/*++
2/* NAME
3/*	mail_conf_int 3
4/* SUMMARY
5/*	integer-valued configuration parameter support
6/* SYNOPSIS
7/*	#include <mail_conf.h>
8/*
9/*	int	get_mail_conf_int(name, defval, min, max);
10/*	const char *name;
11/*	int	defval;
12/*	int	min;
13/*	int	max;
14/*
15/*	int	get_mail_conf_int_fn(name, defval, min, max);
16/*	const char *name;
17/*	int	(*defval)();
18/*	int	min;
19/*	int	max;
20/*
21/*	void	set_mail_conf_int(name, value)
22/*	const char *name;
23/*	int	value;
24/*
25/*	void	get_mail_conf_int_table(table)
26/*	const CONFIG_INT_TABLE *table;
27/*
28/*	void	get_mail_conf_int_fn_table(table)
29/*	const CONFIG_INT_TABLE *table;
30/* AUXILIARY FUNCTIONS
31/*	int	get_mail_conf_int2(name1, name2, defval, min, max);
32/*	const char *name1;
33/*	const char *name2;
34/*	int	defval;
35/*	int	min;
36/*	int	max;
37/* DESCRIPTION
38/*	This module implements configuration parameter support
39/*	for integer values.
40/*
41/*	get_mail_conf_int() looks up the named entry in the global
42/*	configuration dictionary. The default value is returned
43/*	when no value was found.
44/*	\fImin\fR is zero or specifies a lower limit on the integer
45/*	value or string length; \fImax\fR is zero or specifies an
46/*	upper limit on the integer value or string length.
47/*
48/*	get_mail_conf_int_fn() is similar but specifies a function that
49/*	provides the default value. The function is called only
50/*	when the default value is needed.
51/*
52/*	set_mail_conf_int() updates the named entry in the global
53/*	configuration dictionary. This has no effect on values that
54/*	have been looked up earlier via the get_mail_conf_XXX() routines.
55/*
56/*	get_mail_conf_int_table() and get_mail_conf_int_fn_table() initialize
57/*	lists of variables, as directed by their table arguments. A table
58/*	must be terminated by a null entry.
59/*
60/*	get_mail_conf_int2() concatenates the two names and is otherwise
61/*	identical to get_mail_conf_int().
62/* DIAGNOSTICS
63/*	Fatal errors: malformed numerical value.
64/* SEE ALSO
65/*	config(3) general configuration
66/*	mail_conf_str(3) string-valued configuration parameters
67/* LICENSE
68/* .ad
69/* .fi
70/*	The Secure Mailer license must be distributed with this software.
71/* AUTHOR(S)
72/*	Wietse Venema
73/*	IBM T.J. Watson Research
74/*	P.O. Box 704
75/*	Yorktown Heights, NY 10598, USA
76/*--*/
77
78/* System library. */
79
80#include <sys_defs.h>
81#include <stdlib.h>
82#include <stdio.h>			/* BUFSIZ */
83#include <errno.h>
84
85/* Utility library. */
86
87#include <msg.h>
88#include <mymalloc.h>
89#include <dict.h>
90#include <stringops.h>
91
92/* Global library. */
93
94#include "mail_conf.h"
95
96/* convert_mail_conf_int - look up and convert integer parameter value */
97
98static int convert_mail_conf_int(const char *name, int *intval)
99{
100    const char *strval;
101    char   *end;
102    long    longval;
103
104    if ((strval = mail_conf_lookup_eval(name)) != 0) {
105	errno = 0;
106	*intval = longval = strtol(strval, &end, 10);
107	if (*strval == 0 || *end != 0 || errno == ERANGE || longval != *intval)
108	    msg_fatal("bad numerical configuration: %s = %s", name, strval);
109	return (1);
110    }
111    return (0);
112}
113
114/* check_mail_conf_int - validate integer value */
115
116static void check_mail_conf_int(const char *name, int intval, int min, int max)
117{
118    if (min && intval < min)
119	msg_fatal("invalid %s parameter value %d < %d", name, intval, min);
120    if (max && intval > max)
121	msg_fatal("invalid %s parameter value %d > %d", name, intval, max);
122}
123
124/* get_mail_conf_int - evaluate integer-valued configuration variable */
125
126int     get_mail_conf_int(const char *name, int defval, int min, int max)
127{
128    int     intval;
129
130    if (convert_mail_conf_int(name, &intval) == 0)
131	set_mail_conf_int(name, intval = defval);
132    check_mail_conf_int(name, intval, min, max);
133    return (intval);
134}
135
136/* get_mail_conf_int2 - evaluate integer-valued configuration variable */
137
138int     get_mail_conf_int2(const char *name1, const char *name2, int defval,
139			           int min, int max)
140{
141    int     intval;
142    char   *name;
143
144    name = concatenate(name1, name2, (char *) 0);
145    if (convert_mail_conf_int(name, &intval) == 0)
146	set_mail_conf_int(name, intval = defval);
147    check_mail_conf_int(name, intval, min, max);
148    myfree(name);
149    return (intval);
150}
151
152/* get_mail_conf_int_fn - evaluate integer-valued configuration variable */
153
154typedef int (*stupid_indent_int) (void);
155
156int     get_mail_conf_int_fn(const char *name, stupid_indent_int defval,
157			             int min, int max)
158{
159    int     intval;
160
161    if (convert_mail_conf_int(name, &intval) == 0)
162	set_mail_conf_int(name, intval = defval());
163    check_mail_conf_int(name, intval, min, max);
164    return (intval);
165}
166
167/* set_mail_conf_int - update integer-valued configuration dictionary entry */
168
169void    set_mail_conf_int(const char *name, int value)
170{
171    char    buf[BUFSIZ];		/* yeah! crappy code! */
172
173    sprintf(buf, "%d", value);			/* yeah! more crappy code! */
174    mail_conf_update(name, buf);
175}
176
177/* get_mail_conf_int_table - look up table of integers */
178
179void    get_mail_conf_int_table(const CONFIG_INT_TABLE *table)
180{
181    while (table->name) {
182	table->target[0] = get_mail_conf_int(table->name, table->defval,
183					     table->min, table->max);
184	table++;
185    }
186}
187
188/* get_mail_conf_int_fn_table - look up integers, defaults are functions */
189
190void    get_mail_conf_int_fn_table(const CONFIG_INT_FN_TABLE *table)
191{
192    while (table->name) {
193	table->target[0] = get_mail_conf_int_fn(table->name, table->defval,
194						table->min, table->max);
195	table++;
196    }
197}
198