mail_conf_str.c

[詳解]

/*++
/* NAME
/*  mail_conf_str 3
/* SUMMARY
/*  string-valued global configuration parameter support
/* SYNOPSIS
/*  #include <mail_conf.h>
/*
/*  char    *get_mail_conf_str(name, defval, min, max)
/*  const char *name;
/*  const char *defval;
/*  int min;
/*  int max;
/*
/*  char    *get_mail_conf_str_fn(name, defval, min, max)
/*  const char *name;
/*  const char *(*defval)(void);
/*  int min;
/*  int max;
/*
/*  void    set_mail_conf_str(name, value)
/*  const char *name;
/*  const char *value;
/*
/*  void    get_mail_conf_str_table(table)
/*  const CONFIG_STR_TABLE *table;
/*
/*  void    get_mail_conf_str_fn_table(table)
/*  const CONFIG_STR_TABLE *table;
/* AUXILIARY FUNCTIONS
/*  char    *get_mail_conf_str2(name, suffix, defval, min, max)
/*  const char *name;
/*  const char *suffix;
/*  const char *defval;
/*  int min;
/*  int max;
/*
/*  void    check_mail_conf_str(name, strval, min, max)
/*  const char *name;
/*  const char *strval;
/*  int min; 
/*  int max;
/* DESCRIPTION
/*  This module implements support for string-valued global
/*  configuration parameters.
/*
/*  get_mail_conf_str() looks up the named entry in the global
/*  configuration dictionary. The default value is returned when
/*  no value was found. String results should be passed to myfree()
/*  when no longer needed.  \fImin\fR is zero or specifies a lower
/*  bound on the string length; \fImax\fR is zero or specifies an
/*  upper limit on the string length.
/*
/*  get_mail_conf_str_fn() is similar but specifies a function that
/*  provides the default value. The function is called only when
/*  the default value is used.
/*
/*  set_mail_conf_str() 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_str_table() and get_mail_conf_str_fn_table() read
/*  lists of variables, as directed by their table arguments. A table
/*  must be terminated by a null entry.
/*
/*  get_mail_conf_str2() concatenates the two names and is otherwise
/*  identical to get_mail_conf_str().
/*
/*  check_mail_conf_str() exits with a fatal run-time error
/*  when the string does not meet its length requirements.
/* DIAGNOSTICS
/*  Fatal errors: bad string length.
/* SEE ALSO
/*  config(3) generic config parameter support
/* 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
/*--*/

/* System library. */

#include <sys_defs.h>
#include <stdlib.h>
#include <string.h>

/* Utility library. */

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

/* Global library. */

#include "mail_conf.h"

/* check_mail_conf_str - validate string length */

void    check_mail_conf_str(const char *name, const char *strval,
                        int min, int max)
{
    ssize_t len = strlen(strval);

    if (min && len < min)
    msg_fatal("bad string length %ld < %d: %s = %s",
          (long) len, min, name, strval);
    if (max && len > max)
    msg_fatal("bad string length %ld > %d: %s = %s",
          (long) len, max, name, strval);
}

/* get_mail_conf_str - evaluate string-valued configuration variable */

char   *get_mail_conf_str(const char *name, const char *defval,
                      int min, int max)
{
    const char *strval;

    if ((strval = mail_conf_lookup_eval(name)) == 0) {
    strval = mail_conf_eval(defval);
    mail_conf_update(name, strval);
    }
    check_mail_conf_str(name, strval, min, max);
    return (mystrdup(strval));
}

/* get_mail_conf_str2 - evaluate string-valued configuration variable */

char   *get_mail_conf_str2(const char *name1, const char *name2,
                       const char *defval,
                       int min, int max)
{
    const char *strval;
    char   *name;

    name = concatenate(name1, name2, (char *) 0);
    if ((strval = mail_conf_lookup_eval(name)) == 0) {
    strval = mail_conf_eval(defval);
    mail_conf_update(name, strval);
    }
    check_mail_conf_str(name, strval, min, max);
    myfree(name);
    return (mystrdup(strval));
}

/* get_mail_conf_str_fn - evaluate string-valued configuration variable */

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

char   *get_mail_conf_str_fn(const char *name, stupid_indent_str defval,
                         int min, int max)
{
    const char *strval;

    if ((strval = mail_conf_lookup_eval(name)) == 0) {
    strval = mail_conf_eval(defval());
    mail_conf_update(name, strval);
    }
    check_mail_conf_str(name, strval, min, max);
    return (mystrdup(strval));
}

/* set_mail_conf_str - update string-valued configuration dictionary entry */

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

/* get_mail_conf_str_table - look up table of strings */

void    get_mail_conf_str_table(const CONFIG_STR_TABLE *table)
{
    while (table->name) {
    if (table->target[0])
        myfree(table->target[0]);
    table->target[0] = get_mail_conf_str(table->name, table->defval,
                         table->min, table->max);
    table++;
    }
}

/* get_mail_conf_str_fn_table - look up strings, defaults are functions */

void    get_mail_conf_str_fn_table(const CONFIG_STR_FN_TABLE *table)
{
    while (table->name) {
    if (table->target[0])
        myfree(table->target[0]);
    table->target[0] = get_mail_conf_str_fn(table->name, table->defval,
                        table->min, table->max);
    table++;
    }
}