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Unix System Administration Handbook 1997 October
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usah_oct97.iso
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news
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cnews.tar
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libcnews
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config.c
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C/C++ Source or Header
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1994-08-17
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4KB
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238 lines
/*
* news configuration inquiry
*/
#include <stdio.h>
#include <sys/types.h>
#include "libc.h"
#include "news.h"
#include "config.h"
#ifndef NULL
#define NULL 0
#endif
#ifndef NEWSCTL
/* =()<#define NEWSCTL "@<NEWSCTL>@">()= */
#define NEWSCTL "/etc/news"
#endif
#ifndef NEWSPATH
/* =()<#define NEWSPATH "@<NEWSPATH>@">()= */
#define NEWSPATH "/bin:/usr/bin:/usr/contrib/bin"
#endif
#ifndef NEWSARTS
/* =()<#define NEWSARTS "@<NEWSARTS>@">()= */
#define NEWSARTS "/var/news"
#endif
#ifndef NEWSBIN
/* =()<#define NEWSBIN "@<NEWSBIN>@">()= */
#define NEWSBIN "/usr/libexec/news"
#endif
#ifndef NEWSUMASK
/* =()<#define NEWSUMASK @<NEWSUMASK>@>()= */
#define NEWSUMASK 022
#endif
#ifndef NEWSCONFIG
/* =()<#define NEWSCONFIG "@<NEWSCONFIG>@">()= */
#define NEWSCONFIG "/etc/news/bin/config"
#endif
static char *pwd = NULL; /* Current directory, NULL means unknown. */
static int dirsset = NO; /* Have the following been set up? */
static char *arts = NEWSARTS;
static char *bin = NEWSBIN;
static char *ctl = NEWSCTL;
static char *path = NEWSPATH;
static int numask = NEWSUMASK;
static char *nconfig = NEWSCONFIG;
#define DIRS() if (!dirsset) setdirs()
extern char *getenv();
/*
- setdirs - set up stuff from environment, for use by other functions
*
* Invokes user-supplied function unprivileged() if non-standard values used.
*/
static void
setdirs()
{
register char *p;
register int mask;
register char *scan;
register int ns = 0;
# define NONSTD(reason) { if (!ns) { unprivileged(reason); ns = 1; } }
if (dirsset)
return;
p = getenv("NEWSARTS");
if (p != NULL && !STREQ(p, arts)) {
arts = p;
NONSTD("NEWSARTS");
}
p = getenv("NEWSCTL");
if (p != NULL && !STREQ(p, ctl)) {
ctl = p;
NONSTD("NEWSCTL");
}
p = getenv("NEWSPATH");
if (p != NULL && !STREQ(p, path)) {
path = p;
NONSTD("NEWSPATH");
}
p = getenv("NEWSBIN");
if (p != NULL && !STREQ(p, bin)) {
bin = p;
NONSTD("NEWSBIN");
}
p = getenv("NEWSUMASK");
if (p != NULL) {
mask = 0;
for (scan = p; *scan != '\0'; scan++)
if ('0' <= *scan && *scan <= '7' && mask <= 077)
mask = (mask << 3) | (*scan - '0');
else { /* Garbage, ignore it. */
mask = numask;
break; /* NOTE BREAK OUT */
}
if (mask != numask) {
numask = mask;
NONSTD("NEWSUMASK");
}
}
p = getenv("NEWSCONFIG");
if (p != NULL && !STREQ(p, nconfig)) {
nconfig = p;
NONSTD("NEWSCONFIG");
}
dirsset = YES;
}
/*
- artfile - best pathname for a file in NEWSARTS
*/
char *
artfile(base)
char *base;
{
static char *artf = NULL;
DIRS();
if (base == NULL) /* he just wants the directory */
return (arts);
if (artf != NULL)
free(artf); /* toss old returned value */
if (pwd != NULL && STREQ(pwd, arts))
artf = strsave(base);
else
artf = str3save(arts, SFNDELIM, base);
return (artf);
}
/*
- fullartfile - full pathname for a file in NEWSARTS
*/
char *
fullartfile(base)
char *base;
{
register char *p;
register char *pwdsave;
pwdsave = pwd;
pwd = NULL; /* fool artfile() into giving full path */
p = artfile(base);
pwd = pwdsave;
return (p);
}
/*
- ctlfile - full pathname for a file in NEWSCTL
*/
char *
ctlfile(base)
char *base;
{
static char *ctlf = NULL;
DIRS();
if (ctlf != NULL)
free(ctlf); /* toss old returned value */
if (base == NULL) {
ctlf = NULL;
return(ctl);
} else {
ctlf = str3save(ctl, SFNDELIM, base);
return(ctlf);
}
}
/*
- binfile - full pathname for a file in NEWSBIN
*/
char *
binfile(base)
char *base;
{
static char *binf = NULL;
DIRS();
if (binf != NULL)
free(binf); /* toss old returned value */
if (base == NULL) {
binf = NULL;
return(bin);
} else {
binf = str3save(bin, SFNDELIM, base);
return (binf);
}
}
/*
- cd - change to a directory, with checking
*/
void
cd(dir)
char *dir;
{
if (pwd != NULL)
free(pwd);
if (chdir(dir) < 0)
errunlock("cannot chdir(%s)", dir);
pwd = strsave(dir);
}
/*
- newspath - search path for normal system commands
*/
char *
newspath()
{
DIRS();
return(path);
}
/*
- newsumask - suitable value of umask for news stuff
*/
int
newsumask()
{
DIRS();
return(numask);
}