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/*
** $Id: defaults.c,v 2.0 90/09/19 19:42:09 paul Rel $
**
** Routines to access runtime defaults file.
** This is to allow program features to be configured
** without the need to recompile.
**
** XENIX has defopen(S) and defread(S), but I think this is better,
** since it reads the file only once, storing the values in core.
** It is certainly more portable.
*/
/*
** Copyright 1989,1990 by Paul Sutcliffe Jr.
**
** Permission is hereby granted to copy, reproduce, redistribute,
** or otherwise use this software as long as: there is no monetary
** profit gained specifically from the use or reproduction or this
** software, it is not sold, rented, traded or otherwise marketed,
** and this copyright notice is included prominently in any copy
** made.
**
** The author make no claims as to the fitness or correctness of
** this software for any use whatsoever, and it is provided as is.
** Any use of this software is at the user's own risk.
*/
/*
** $Log: defaults.c,v $
** Revision 2.0 90/09/19 19:42:09 paul
** Initial 2.0 release
**
*/
#include "getty.h"
#include "defaults.h"
#include <sys/stat.h>
#include <errno.h>
#include <ctype.h>
/*
** defbuild() - create in-core list of defaults
**
** Returns (DEF**)NULL if no defaults file found or an error occurs.
*/
DEF **
defbuild(filename)
char *filename;
{
register int i;
register DEF *dp;
register DEF *next;
FILE *fp;
char *fname, defname[MAXLINE+1], buf[MAXLINE+1];
static DEF *deflist[MAXDEF+1]; /* in-core list */
struct stat st;
extern int errno;
debug(D_DEF, "defbuild(%s) called",
((filename == (char *) NULL) ? "NULL" : filename));
/* look to see if there's a DEFAULTS/MyName.Device file
*/
(void) sprintf(buf, "%s", DEFAULTS);
(void) strcat(buf, ".%s");
(void) sprintf(defname, buf, MyName, Device);
debug(D_DEF, "looking for %s", defname);
if ((stat(defname, &st) == FAIL) && errno == ENOENT) { /* Nope */
debug(D_DEF, "stat failed, no file");
(void) sprintf(defname, DEFAULTS, MyName);
}
fname = (filename != (char *) NULL) ? filename : defname;
/* if fname doesn't begin with a '/', assume it's a
* filename to be made "DEFAULTS/fname"
*/
if (*fname != '/') {
(void) sprintf(defname, DEFAULTS, fname);
fname = defname;
}
debug(D_DEF, "fname = (%s)", fname);
if ((fp = defopen(fname)) == (FILE *) NULL) {
debug(D_DEF, "defopen() failed");
return((DEF **) NULL); /* couldn't open file */
}
for (i=0; i < MAXDEF; i++) {
if ((dp = defread(fp)) == (DEF *) NULL)
break;
if ((next = (DEF *) malloc((unsigned) sizeof(DEF))) ==
(DEF *) NULL) {
logerr("malloc() failed: defaults list truncated");
break;
}
next->name = dp->name;
next->value = dp->value;
deflist[i] = next;
debug(D_DEF, "deflist[%d]: name=(%s), value=(%s)",
i, deflist[i]->name, deflist[i]->value);
}
deflist[i] = (DEF *) NULL; /* terminate list */
(void) defclose(fp);
debug(D_DEF, "defbuild() successful");
return(deflist);
}
/*
** defvalue() - locate the value in "deflist" that matches "name"
**
** Returns (char*)NULL if no match is made.
*/
char *
defvalue(deflist, name)
register DEF **deflist;
register char *name;
{
debug(D_DEF, "defvalue(%s) called", name);
if (deflist != (DEF **) NULL)
for (; *deflist != (DEF *) NULL; deflist++)
if (strequal(name, (*deflist)->name)) {
debug(D_DEF, "defvalue returns (%s)",
(*deflist)->value);
return((*deflist)->value); /* normal exit */
}
debug(D_DEF, "defvalue returns NULL");
return((char *) NULL);
}
/*
** defopen() - open the defaults file
**
** Returns (FILE*)NULL if file not found or an error occurs.
*/
FILE *
defopen(filename)
register char *filename;
{
if (filename != (char *) NULL)
return(fopen(filename, "r"));
return((FILE *) NULL);
}
/*
** defread() - read a line from the defaults file
**
** Returns (DEF*)NULL if an error occurs.
*/
DEF *
defread(fp)
register FILE *fp;
{
register char *p, *p2;
char buf[MAXLINE+1]; /* buffer large enough for 1 line */
static DEF def;
do {
if (fgets(buf, sizeof(buf), fp) == (char *) NULL)
return((DEF *) NULL); /* no more lines */
} while ((buf[0] == '#') || (buf[0] == '\n'));
/* SMR - ignore comment lines */
buf[strlen(buf)-1] = '\0'; /* rm trailing \n */
/* lines should be in the form "NAME=value"
*/
if ((p = index(buf, '=')) == (char *) NULL) {
logerr("bad defaults line: %s", buf);
return((DEF *) NULL);
}
*p++ = '\0'; /* split into two fields, name and value */
while (*p && isspace(*p)) {
p++; /* Jump past space before value. */
}
p2 = p + strlen(p) - 1;
while (isspace(*p2)) {
*p2-- = 0; /* Remove spaces from end of value. */
}
def.value = strdup(p);
p = buf;
while (*p == ' ') {
p++; /* Jump past spaces before variable name. */
}
p2 = p + strlen(p) - 1;
while (isspace(*p2)) {
*p2-- = 0; /* Remove spaces from end of variable name. */
}
def.name = strdup(p);
return(&def);
}
/*
** defclose() - closes the defaults file
**
** Returns EOF if an error occurs.
*/
int
defclose(fp)
register FILE *fp;
{
return(fclose(fp));
}
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