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STR *
do_fttext(arg,TARG)
register ARG *arg;
STR *TARG;
{
int i;
int len;
int odd = 0;
STDCHAR tbuf[512];
register STDCHAR *s;
register STIO *stio;
if (arg[1].arg_type & A_DONT) {
if (arg[1].arg_ptr.arg_stab == defstab) {
if (statstab)
stio = stab_io(statstab);
else {
TARG = statname;
goto really_filename;
}
}
else {
statstab = arg[1].arg_ptr.arg_stab;
str_set(statname,"");
stio = stab_io(statstab);
}
if (stio && stio->ifp) {
#if defined(STDSTDIO) || defined(atarist) /* this will work with atariST */
fstat(fileno(stio->ifp),&statcache);
if (S_ISDIR(statcache.st_mode)) /* handle NFS glitch */
return arg->arg_type == O_FTTEXT ? &str_no : &str_yes;
if (stio->ifp->_cnt <= 0) {
i = getc(stio->ifp);
if (i != EOF)
(void)ungetc(i,stio->ifp);
}
if (stio->ifp->_cnt <= 0) /* null file is anything */
return &str_yes;
len = stio->ifp->_cnt + (stio->ifp->_ptr - stio->ifp->_base);
s = stio->ifp->_base;
#else
fatal("-T and -B not implemented on filehandles");
#endif
}
else {
if (dowarn)
warn("Test on unopened file <%s>",
stab_ename(arg[1].arg_ptr.arg_stab));
errno = EBADF;
return &str_undef;
}
}
else {
statstab = Nullstab;
str_set(statname,str_get(TARG));
really_filename:
i = open(str_get(TARG),0);
if (i < 0) {
if (dowarn && index(str_get(TARG), '\n'))
warn(warn_nl, "open");
return &str_undef;
}
fstat(i,&statcache);
len = read(i,tbuf,512);
(void)close(i);
if (len <= 0) {
if (S_ISDIR(statcache.st_mode) && arg->arg_type == O_FTTEXT)
return &str_no; /* special case NFS directories */
return &str_yes; /* null file is anything */
}
s = tbuf;
}
/* now scan s to look for textiness */
for (i = 0; i < len; i++,s++) {
if (!*s) { /* null never allowed in text */
odd += len;
break;
}
else if (*s & 128)
odd++;
else if (*s < 32 &&
*s != '\n' && *s != '\r' && *s != '\b' &&
*s != '\t' && *s != '\f' && *s != 27)
odd++;
}
if ((odd * 10 > len) == (arg->arg_type == O_FTTEXT)) /* allow 10% odd */
return &str_no;
else
return &str_yes;
}
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