4.3BSD/usr/contrib/rn/util.c
/* $Header: util.c,v 4.3.1.2 85/05/15 14:44:27 lwall Exp $
*
* $Log: util.c,v $
* Revision 4.3.1.2 85/05/15 14:44:27 lwall
* Last arg of execl changed from 0 to Nullch [(char*)0].
*
* Revision 4.3.1.1 85/05/10 11:41:30 lwall
* Branch for patches.
*
* Revision 4.3 85/05/01 11:51:44 lwall
* Baseline for release with 4.3bsd.
*
*/
#include "EXTERN.h"
#include "common.h"
#include "final.h"
#include "ndir.h"
#include "INTERN.h"
#include "util.h"
void
util_init()
{
;
}
/* fork and exec a shell command */
int
doshell(shl,s)
char *s, *shl;
{
int status, pid, w;
register int (*istat)(), (*qstat)();
int (*signal())();
char *shell;
#ifdef SIGTSTP
sigset(SIGTSTP,SIG_DFL);
sigset(SIGCONT,SIG_DFL);
#endif
if (shl != Nullch)
shell = shl;
else if ((shell = getenv("SHELL")) == Nullch || !*shell)
shell = PREFSHELL;
if ((pid = vfork()) == 0) {
if (*s)
execl(shell, shell, "-c", s, Nullch);
else
execl(shell, shell, Nullch, Nullch, Nullch);
_exit(127);
}
#ifndef lint
istat = signal(SIGINT, SIG_IGN);
qstat = signal(SIGQUIT, SIG_IGN);
#else
istat = Null(int (*)());
qstat = Null(int (*)());
#endif lint
waiting = TRUE;
while ((w = wait(&status)) != pid && w != -1)
;
if (w == -1)
status = -1;
waiting = FALSE;
signal(SIGINT, istat);
signal(SIGQUIT, qstat);
#ifdef SIGTSTP
sigset(SIGTSTP,stop_catcher);
sigset(SIGCONT,cont_catcher);
#endif
return status;
}
static char nomem[] = "rn: out of memory!\n";
/* paranoid version of malloc */
char *
safemalloc(size)
MEM_SIZE size;
{
char *ptr;
char *malloc();
ptr = malloc(size?size:1); /* malloc(0) is NASTY on our system */
if (ptr != Nullch)
return ptr;
else {
fputs(nomem,stdout) FLUSH;
sig_catcher(0);
}
/*NOTREACHED*/
}
/* paranoid version of realloc */
char *
saferealloc(where,size)
char *where;
MEM_SIZE size;
{
char *ptr;
char *realloc();
ptr = realloc(where,size?size:1); /* realloc(0) is NASTY on our system */
if (ptr != Nullch)
return ptr;
else {
fputs(nomem,stdout) FLUSH;
sig_catcher(0);
}
/*NOTREACHED*/
}
/* safe version of string copy */
char *
safecpy(to,from,len)
char *to;
register char *from;
register int len;
{
register char *dest = to;
if (from != Nullch)
for (len--; len && (*dest++ = *from++); len--) ;
*dest = '\0';
return to;
}
/* safe version of string concatenate, with \n deletion and space padding */
char *
safecat(to,from,len)
char *to;
register char *from;
register int len;
{
register char *dest = to;
len--; /* leave room for null */
if (*dest) {
while (len && *dest++) len--;
if (len) {
len--;
*(dest-1) = ' ';
}
}
if (from != Nullch)
while (len && (*dest++ = *from++)) len--;
if (len)
dest--;
if (*(dest-1) == '\n')
dest--;
*dest = '\0';
return to;
}
/* copy a string up to some (non-backslashed) delimiter, if any */
char *
cpytill(to,from,delim)
register char *to, *from;
register int delim;
{
for (; *from; from++,to++) {
if (*from == '\\' && from[1] == delim)
from++;
else if (*from == delim)
break;
*to = *from;
}
*to = '\0';
return from;
}
/* return ptr to little string in big string, NULL if not found */
char *
instr(big, little)
char *big, *little;
{
register char *t, *s, *x;
for (t = big; *t; t++) {
for (x=t,s=little; *s; x++,s++) {
if (!*x)
return Nullch;
if (*s != *x)
break;
}
if (!*s)
return t;
}
return Nullch;
}
/* effective access */
#ifdef SETUIDGID
int
eaccess(filename, mod)
char *filename;
int mod;
{
int protection, euid;
mod &= 7; /* remove extraneous garbage */
if (stat(filename, &filestat) < 0)
return -1;
euid = geteuid();
if (euid == ROOTID)
return 0;
protection = 7 & (filestat.st_mode >>
(filestat.st_uid == euid ? 6 :
(filestat.st_gid == getegid() ? 3 : 0)
));
if ((mod & protection) == mod)
return 0;
errno = EACCES;
return -1;
}
#endif
/*
* Get working directory
*/
#ifdef GETWD
#define dot "."
#define dotdot ".."
static char *name;
static DIR *dirp;
static int off;
static struct stat d, dd;
static struct direct *dir;
char *
getwd(np)
char *np;
{
long rdev, rino;
*np++ = '/';
*np = 0;
name = np;
off = -1;
stat("/", &d);
rdev = d.st_dev;
rino = d.st_ino;
for (;;) {
stat(dot, &d);
if (d.st_ino==rino && d.st_dev==rdev)
goto done;
if ((dirp = opendir(dotdot)) == Null(DIR *))
prexit("getwd: cannot open ..\n");
stat(dotdot, &dd);
chdir(dotdot);
if(d.st_dev == dd.st_dev) {
if(d.st_ino == dd.st_ino)
goto done;
do
if ((dir = readdir(dirp)) == Null(struct direct *))
prexit("getwd: read error in ..\n");
while (dir->d_ino != d.st_ino);
}
else do {
if ((dir = readdir(dirp)) == Null(struct direct *))
prexit("getwd: read error in ..\n");
stat(dir->d_name, &dd);
} while(dd.st_ino != d.st_ino || dd.st_dev != d.st_dev);
cat();
closedir(dirp);
}
done:
name--;
if (chdir(name) < 0) {
printf("getwd: can't cd back to %s\n",name) FLUSH;
sig_catcher(0);
}
return (name);
}
void
cat()
{
register i, j;
i = -1;
while (dir->d_name[++i] != 0);
if ((off+i+2) > 1024-1)
return;
for(j=off+1; j>=0; --j)
name[j+i+1] = name[j];
if (off >= 0)
name[i] = '/';
off=i+off+1;
name[off] = 0;
for(--i; i>=0; --i)
name[i] = dir->d_name[i];
}
void
prexit(cp)
char *cp;
{
write(2, cp, strlen(cp));
sig_catcher(0);
}
#else
char *
getwd(np) /* shorter but slower */
char *np;
{
FILE *popen();
FILE *pipefp = popen("/bin/pwd","r");
if (pipefd == Nullfp) {
printf("Can't run /bin/pwd\n") FLUSH;
finalize(1);
}
fgets(np,512,pipefp);
np[strlen(np)-1] = '\0'; /* wipe out newline */
pclose(pipefp);
return np;
}
#endif
/* just like fgets but will make bigger buffer as necessary */
char *
get_a_line(original_buffer,buffer_length,fp)
char *original_buffer;
register int buffer_length;
FILE *fp;
{
register int bufix = 0;
register int nextch;
register char *some_buffer_or_other = original_buffer;
do {
if (bufix >= buffer_length) {
buffer_length *= 2;
if (some_buffer_or_other == original_buffer) {
/* currently static? */
some_buffer_or_other = safemalloc((MEM_SIZE)buffer_length+1);
strncpy(some_buffer_or_other,original_buffer,buffer_length/2);
/* so we must copy it */
}
else { /* just grow in place, if possible */
some_buffer_or_other = saferealloc(some_buffer_or_other,
(MEM_SIZE)buffer_length+1);
}
}
if ((nextch = getc(fp)) == EOF)
return Nullch;
some_buffer_or_other[bufix++] = (char) nextch;
} while (nextch && nextch != '\n');
some_buffer_or_other[bufix] = '\0';
len_last_line_got = bufix;
return some_buffer_or_other;
}
/* copy a string to a safe spot */
char *
savestr(str)
char *str;
{
register char *newaddr = safemalloc((MEM_SIZE)(strlen(str)+1));
strcpy(newaddr,str);
return newaddr;
}
int
makedir(dirname,nametype)
register char *dirname;
int nametype;
{
#ifdef MAKEDIR
register char *end;
register char *s;
char tmpbuf[1024];
register char *tbptr = tmpbuf+5;
for (end = dirname; *end; end++) ; /* find the end */
if (nametype == MD_FILE) { /* not to create last component? */
for (--end; end != dirname && *end != '/'; --end) ;
if (*end != '/')
return 0; /* nothing to make */
*end = '\0'; /* isolate file name */
}
strcpy(tmpbuf,"mkdir");
s = end;
for (;;) {
if (stat(dirname,&filestat) >= 0) {
/* does this much exist? */
*s = '/'; /* mark this as existing */
break;
}
s = rindex(dirname,'/'); /* shorten name */
if (!s) /* relative path! */
break; /* hope they know what they are doing */
*s = '\0'; /* mark as not existing */
}
for (s=dirname; s <= end; s++) { /* this is grody but efficient */
if (!*s) { /* something to make? */
sprintf(tbptr," %s",dirname);
tbptr += strlen(tbptr); /* make it, sort of */
*s = '/'; /* mark it made */
}
}
if (nametype == MD_DIR) /* don't need final slash unless */
*end = '\0'; /* a filename follows the dir name */
return (tbptr==tmpbuf+5 ? 0 : doshell(sh,tmpbuf));
/* exercise our faith */
#else
sprintf(cmd_buf,"%s %s %d", filexp(DIRMAKER), dirname, nametype);
return doshell(sh,cmd_buf);
#endif
}
#ifdef SETENV
static bool firstsetenv = TRUE;
extern char **environ;
void
setenv(nam,val)
char *nam, *val;
{
register int i=envix(nam); /* where does it go? */
if (!environ[i]) { /* does not exist yet */
if (firstsetenv) { /* need we copy environment? */
int j;
#ifndef lint
char **tmpenv = (char**) /* point our wand at memory */
safemalloc((MEM_SIZE) (i+2) * sizeof(char*));
#else
char **tmpenv = Null(char **);
#endif lint
firstsetenv = FALSE;
for (j=0; j<i; j++) /* copy environment */
tmpenv[j] = environ[j];
environ = tmpenv; /* tell exec where it is now */
}
#ifndef lint
else
environ = (char**) saferealloc((char*) environ,
(MEM_SIZE) (i+2) * sizeof(char*));
/* just expand it a bit */
#endif lint
environ[i+1] = Nullch; /* make sure it's null terminated */
}
environ[i] = safemalloc((MEM_SIZE) strlen(nam) + strlen(val) + 2);
/* this may or may not be in */
/* the old environ structure */
sprintf(environ[i],"%s=%s",nam,val);/* all that work just for this */
}
int
envix(nam)
char *nam;
{
register int i, len = strlen(nam);
for (i = 0; environ[i]; i++) {
if (strnEQ(environ[i],nam,len) && environ[i][len] == '=')
break; /* strnEQ must come first to avoid */
} /* potential SEGV's */
return i;
}
#endif
void
notincl(feature)
char *feature;
{
printf("\nNo room for feature \"%s\" on this machine.\n",feature) FLUSH;
}
char *
getval(nam,def)
char *nam,*def;
{
char *val;
if ((val = getenv(nam)) == Nullch || !*val)
val = def;
return val;
}
/* grow a static string to at least a certain length */
void
growstr(strptr,curlen,newlen)
char **strptr;
int *curlen;
int newlen;
{
if (newlen > *curlen) { /* need more room? */
if (*curlen)
*strptr = saferealloc(*strptr,(MEM_SIZE)newlen);
else
*strptr = safemalloc((MEM_SIZE)newlen);
*curlen = newlen;
}
}
void
setdef(buffer,dflt)
char *buffer,*dflt;
{
#ifdef STRICTCR
if (*buffer == ' ')
#else
if (*buffer == ' ' || *buffer == '\n')
#endif
{
if (*dflt == '^' && isupper(dflt[1]))
*buffer = Ctl(dflt[1]);
else
*buffer = *dflt;
}
}