4.4BSD/usr/src/contrib/news/trn3/util.c
/* $Id: util.c,v 3.0 1992/02/23 21:25:39 davison Trn $
*/
/* This software is Copyright 1991 by Stan Barber.
*
* 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 of 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.
*/
#include "EXTERN.h"
#include "common.h"
#include "final.h"
#include "term.h"
#include "INTERN.h"
#include "util.h"
#ifndef HAS_STRFTIME
#include "sys/time.h"
#endif
void
util_init()
{
;
}
/* fork and exec a shell command */
int
doshell(shl,s)
char *s, *shl;
{
int status, pid, w;
char *shell;
#ifdef SIGTSTP
sigset(SIGTSTP,SIG_DFL);
sigset(SIGTTOU,SIG_DFL);
sigset(SIGTTIN,SIG_DFL);
#endif
if (shl != Nullch)
shell = shl;
else if ((shell = getenv("SHELL")) == Nullch || !*shell)
shell = PREFSHELL;
if ((pid = vfork()) == 0) {
#ifdef USE_NNTP
int i;
/* This is necessary to keep bourne shell from puking */
for (i = 3; i < 10; ++i)
close(i);
#endif /* USE_NNTP */
if (*s)
execl(shell, shell, "-c", s, Nullch);
else
execl(shell, shell, Nullch, Nullch, Nullch);
_exit(127);
}
signal(SIGINT, SIG_IGN);
#ifdef SIGQUIT
signal(SIGQUIT, SIG_IGN);
#endif
termlib_reset();
waiting = TRUE;
while ((w = wait(&status)) != pid)
if (w == -1 && errno != EINTR)
break;
if (w == -1)
status = -1;
termlib_init();
waiting = FALSE;
sigset(SIGINT, int_catcher); /* always catch interrupts */
#ifdef SIGQUIT
signal(SIGQUIT, SIG_DFL);
#endif
#ifdef SIGTSTP
sigset(SIGTSTP,stop_catcher);
sigset(SIGTTOU,stop_catcher);
sigset(SIGTTIN,stop_catcher);
#endif
return status;
}
static char nomem[] = "trn: out of memory!\n";
/* paranoid version of malloc */
char *
safemalloc(size)
MEM_SIZE size;
{
char *ptr;
ptr = malloc(size ? size : (MEM_SIZE)1);
if (ptr == Nullch) {
fputs(nomem,stdout) FLUSH;
sig_catcher(0);
}
return ptr;
}
/* paranoid version of realloc. If where is NULL, call malloc */
char *
saferealloc(where,size)
char *where;
MEM_SIZE size;
{
char *ptr;
if (!where)
ptr = malloc(size ? size : (MEM_SIZE)1);
else
ptr = realloc(where, size ? size : (MEM_SIZE)1);
if (!ptr) {
fputs(nomem,stdout) FLUSH;
sig_catcher(0);
}
return ptr;
}
/* 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, case_matters)
char *big, *little;
bool_int case_matters;
{
register char *t, *s, *x;
for (t = big; *t; t++) {
for (x=t,s=little; *s; x++,s++) {
if (!*x)
return Nullch;
if (case_matters == TRUE) {
if(*s != *x)
break;
} else {
register char c,d;
if (isupper(*s))
c = tolower(*s);
else
c = *s;
if (isupper(*x))
d = tolower(*x);
else
d = *x;
if ( c != d )
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
*/
#ifndef HAS_GETWD
#ifdef HAS_GETCWD
char *
getwd(np)
char *np;
{
extern char *getcwd();
return getcwd(np,512);
}
#else
char *
getwd(np)
char *np;
{
FILE *popen();
FILE *pipefp = popen("/bin/pwd","r");
if (pipefp == 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
#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;
buflen_last_line_got = buffer_length;
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 && (filestat.st_mode & S_IFDIR)) {
/* does this much exist as a dir? */
*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;
lastchar = *buffer;
}
}
#if !defined(HAS_STRFTIME) && defined(HAS_FTIME) && !defined(TM_ZONE)
/*
* strftime: print formatted information about a given time.
* Adapted from the routine by Eric R. Smith, Michal Jaegermann,
* Arnold Robins, and Paul Close.
*/
/* Configuration choices for %x and %X */
#undef LOCAL_DDMMYY /* choose DD/MM/YY instead of MM/DD/YY */
#undef LOCAL_DOTTIME /* choose HH.MM.SS instead of HH:MM:SS */
static char *mth_name[] = {
"January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December"
};
static char *day_name[] = {
"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday",
"Saturday"
};
#ifdef HAS_FTIME
# ifndef TM_ZONE
char tznm[16] = "";
# endif
#else
extern char *tzname[];
#endif
size_t
strftime(str, maxsize, fmt, ts)
char *str;
size_t maxsize;
CONST char *fmt;
CONST struct tm *ts;
{
size_t num = 0, len;
char ch;
char *putstr, *s;
char tmpbuf[80];
if (maxsize-- <= 0)
return 0;
for (;;) {
if (!(ch = *fmt++))
break;
if (num == maxsize) {
num = 0;
break;
}
if (ch != '%') {
*str++ = ch;
num++;
continue;
}
/* assume the finished product will be sprintf'ed into tmpbuf */
putstr = tmpbuf;
switch (ch = *fmt++) {
case 'A':
case 'a':
if (ts->tm_wday < 0 || ts->tm_wday > 6)
putstr = "?";
else
if (ch == 'A')
putstr = day_name[ts->tm_wday];
else
sprintf(tmpbuf, "%-.3s", day_name[ts->tm_wday]);
break;
case 'B':
case 'b':
case 'h':
if (ts->tm_mon < 0 || ts->tm_mon > 11)
putstr = "?";
else if (ch == 'B')
putstr = mth_name[ts->tm_mon];
else
sprintf(tmpbuf, "%-.3s", mth_name[ts->tm_mon]);
break;
case 'C':
strftime(tmpbuf, sizeof tmpbuf, "%A, %B %e, %Y", ts);
break;
case 'c':
strftime(tmpbuf, sizeof tmpbuf, "%x %X", ts);
break;
case 'D':
#ifndef LOCAL_DDMMYY
case 'x':
#endif
strftime(tmpbuf, sizeof tmpbuf, "%m/%d/%y", ts);
break;
case 'd':
sprintf(tmpbuf, "%02d", ts->tm_mday);
break;
case 'e': /* day of month, blank padded */
sprintf(tmpbuf, "%2d", ts->tm_mday);
break;
case 'H':
sprintf(tmpbuf, "%02d", ts->tm_hour);
break;
case 'I':
{
int n;
n = ts->tm_hour;
if (n == 0)
n = 12;
else if (n > 12)
n -= 12;
sprintf(tmpbuf, "%02d", n);
break;
}
case 'j':
sprintf(tmpbuf, "%03d", ts->tm_yday + 1);
break;
case 'm':
sprintf(tmpbuf, "%02d", ts->tm_mon + 1);
break;
case 'M':
sprintf(tmpbuf, "%02d", ts->tm_min);
break;
case 'p':
putstr = (ts->tm_hour < 12) ? "AM" : "PM";
break;
case 'r':
strftime(tmpbuf, sizeof tmpbuf, "%I:%M:%S %p", ts);
break;
case 'R':
strftime(tmpbuf, sizeof tmpbuf, "%H:%M", ts);
break;
case 'S':
sprintf(tmpbuf, "%02d", ts->tm_sec);
break;
case 'T':
#ifndef LOCAL_DOTTIME
case 'X':
#endif
strftime(tmpbuf, sizeof tmpbuf, "%H:%M:%S", ts);
break;
case 'U': /* week of year - starting Sunday */
sprintf(tmpbuf, "%02d", (ts->tm_yday - ts->tm_wday + 10) / 7);
break;
case 'W': /* week of year - starting Monday */
sprintf(tmpbuf, "%02d", (ts->tm_yday - ((ts->tm_wday + 6) % 7)
+ 10) / 7);
break;
case 'w':
sprintf(tmpbuf, "%d", ts->tm_wday);
break;
case 'y':
sprintf(tmpbuf, "%02d", ts->tm_year % 100);
break;
#ifdef LOCAL_DOTTIME
case 'X':
strftime(tmpbuf, sizeof tmpbuf, "%H.%M.%S", ts);
break;
#endif
#ifdef LOCAL_DDMMYY
case 'x':
strftime(tmpbuf, sizeof tmpbuf, "%d/%m/%y", ts);
break;
#endif
case 'Y':
sprintf(tmpbuf, "%d", ts->tm_year + 1900);
break;
case 'Z':
#ifdef HAS_FTIME
# ifdef TM_ZONE
sprintf(tmpbuf, "%s", ts->tm_zone);
# else
if (*tznm == '\0') {
char *timezone();
struct timeval tv;
struct timezone tz;
(void) gettimeofday(&tv, &tz);
strcpy(tznm, timezone(tz.tz_minuteswest, ts->tm_isdst));
}
sprintf(tmpbuf, "%s", tznm);
# endif
#else
sprintf(tmpbuf, "%s", tzname[ts->tm_isdst]);
#endif
break;
case '%':
case '\0':
putstr = "%";
break;
case 'n': /* same as \n */
putstr = "\n";
break;
case 't': /* same as \t */
putstr = "\t";
break;
default:
sprintf(tmpbuf, "%%%c", ch);
break;
}
len = strlen(putstr);
num += len;
if (num > maxsize) {
len -= num - maxsize;
num = 0;
ch = '\0';
}
strncpy(str, putstr, len);
str += len;
if (!ch)
break;
}
*str = '\0';
return num;
}
#endif /* !HAS_STRFTIME */