new utilities.

the .C files compile but are renamed to avoid building automatically.

src/cmd/test.c

@@ -0,0 +1,303 @@
+/*
+ * POSIX standard
+ *	test expression
+ *	[ expression ]
+ *
+ * Plan 9 additions:
+ *	-A file exists and is append-only
+ *	-L file exists and is exclusive-use
+ */
+
+#include <u.h>
+#include <libc.h>
+#define EQ(a,b)	((tmp=a)==0?0:(strcmp(tmp,b)==0))
+
+int	ap;
+int	ac;
+char	**av;
+char	*tmp;
+
+void	synbad(char *, char *);
+int	fsizep(char *);
+int	isdir(char *);
+int	isreg(char *);
+int	isatty(int);
+int	isint(char *, int *);
+int	hasmode(char *, ulong);
+int	tio(char *, int);
+int	e(void), e1(void), e2(void), e3(void);
+
+void
+main(int argc, char *argv[])
+{
+
+	ac = argc; av = argv; ap = 1;
+	if(EQ(argv[0],"[")) {
+		if(!EQ(argv[--ac],"]"))
+			synbad("] missing","");
+	}
+	argv[ac] = 0;
+	if (ac<=1) exits("usage");
+	exits(e()?0:"false");
+}
+
+char *
+nxtarg(int mt)
+{
+	if(ap>=ac){
+		if(mt){
+			ap++;
+			return(0);
+		}
+		synbad("argument expected","");
+	}
+	return(av[ap++]);
+}
+
+int
+nxtintarg(int *pans)
+{
+	if(ap<ac && isint(av[ap], pans)){
+		ap++;
+		return 1;
+	}
+	return 0;
+}
+
+int
+e(void) {
+	int p1;
+
+	p1 = e1();
+	if (EQ(nxtarg(1), "-o")) return(p1 || e());
+	ap--;
+	return(p1);
+}
+
+int
+e1(void) {
+	int p1;
+
+	p1 = e2();
+	if (EQ(nxtarg(1), "-a")) return (p1 && e1());
+	ap--;
+	return(p1);
+}
+
+int
+e2(void) {
+	if (EQ(nxtarg(0), "!"))
+		return(!e2());
+	ap--;
+	return(e3());
+}
+
+int
+e3(void) {
+	int p1;
+	char *a;
+	char *p2;
+	int int1, int2;
+
+	a = nxtarg(0);
+	if(EQ(a, "(")) {
+		p1 = e();
+		if(!EQ(nxtarg(0), ")")) synbad(") expected","");
+		return(p1);
+	}
+
+	if(EQ(a, "-A"))
+		return(hasmode(nxtarg(0), DMAPPEND));
+
+	if(EQ(a, "-L"))
+		return(hasmode(nxtarg(0), DMEXCL));
+
+	if(EQ(a, "-f"))
+		return(isreg(nxtarg(0)));
+
+	if(EQ(a, "-d"))
+		return(isdir(nxtarg(0)));
+
+	if(EQ(a, "-r"))
+		return(tio(nxtarg(0), 4));
+
+	if(EQ(a, "-w"))
+		return(tio(nxtarg(0), 2));
+
+	if(EQ(a, "-x"))
+		return(tio(nxtarg(0), 1));
+
+	if(EQ(a, "-e"))
+		return(tio(nxtarg(0), 0));
+
+	if(EQ(a, "-c"))
+		return(0);
+
+	if(EQ(a, "-b"))
+		return(0);
+
+	if(EQ(a, "-u"))
+		return(0);
+
+	if(EQ(a, "-g"))
+		return(0);
+
+	if(EQ(a, "-s"))
+		return(fsizep(nxtarg(0)));
+
+	if(EQ(a, "-t"))
+		if(ap>=ac || !nxtintarg(&int1))
+			return(isatty(1));
+		else
+			return(isatty(int1));
+
+	if(EQ(a, "-n"))
+		return(!EQ(nxtarg(0), ""));
+	if(EQ(a, "-z"))
+		return(EQ(nxtarg(0), ""));
+
+	p2 = nxtarg(1);
+	if (p2==0)
+		return(!EQ(a,""));
+	if(EQ(p2, "="))
+		return(EQ(nxtarg(0), a));
+
+	if(EQ(p2, "!="))
+		return(!EQ(nxtarg(0), a));
+
+	if(!isint(a, &int1))
+		return(!EQ(a,""));
+
+	if(nxtintarg(&int2)){
+		if(EQ(p2, "-eq"))
+			return(int1==int2);
+		if(EQ(p2, "-ne"))
+			return(int1!=int2);
+		if(EQ(p2, "-gt"))
+			return(int1>int2);
+		if(EQ(p2, "-lt"))
+			return(int1<int2);
+		if(EQ(p2, "-ge"))
+			return(int1>=int2);
+		if(EQ(p2, "-le"))
+			return(int1<=int2);
+	}
+
+	synbad("unknown operator ",p2);
+	return 0;		/* to shut ken up */
+}
+
+int
+tio(char *a, int f)
+{
+	return access (a, f) >= 0;
+}
+
+/* copy to local memory; clear names for safety */
+int
+localstat(char *f, Dir *dir)
+{
+	Dir *d;
+
+	d = dirstat(f);
+	if(d == 0)
+		return(-1);
+	*dir = *d;
+	dir->name = 0;
+	dir->uid = 0;
+	dir->gid = 0;
+	dir->muid = 0;
+	return 0;
+}
+
+/* copy to local memory; clear names for safety */
+int
+localfstat(int f, Dir *dir)
+{
+	Dir *d;
+
+	d = dirfstat(f);
+	if(d == 0)
+		return(-1);
+	*dir = *d;
+	dir->name = 0;
+	dir->uid = 0;
+	dir->gid = 0;
+	dir->muid = 0;
+	return 0;
+}
+
+int
+hasmode(char *f, ulong m)
+{
+	Dir dir;
+
+	if(localstat(f,&dir)<0)
+		return(0);
+	return(dir.mode&m);
+}
+
+int
+isdir(char *f)
+{
+	Dir dir;
+
+	if(localstat(f,&dir)<0)
+		return(0);
+	return(dir.mode&DMDIR);
+}
+
+int
+isreg(char *f)
+{
+	Dir dir;
+
+	if(localstat(f,&dir)<0)
+		return(0);
+	return(!(dir.mode&DMDIR));
+}
+
+int
+isatty(int fd)
+{
+	Dir d1, d2;
+
+	if(localfstat(fd, &d1) < 0)
+		return 0;
+	if(localstat("/dev/cons", &d2) < 0)
+		return 0;
+	return d1.type==d2.type && d1.dev==d2.dev && d1.qid.path==d2.qid.path;
+}
+
+int
+fsizep(char *f)
+{
+	Dir dir;
+
+	if(localstat(f,&dir)<0)
+		return(0);
+	return(dir.length>0);
+}
+
+void
+synbad(char *s1, char *s2)
+{
+	int len;
+
+	write(2, "test: ", 6);
+	if ((len = strlen(s1)) != 0)
+		write(2, s1, len);
+	if ((len = strlen(s2)) != 0)
+		write(2, s2, len);
+	write(2, "\n", 1);
+	exits("bad syntax");
+}
+
+int
+isint(char *s, int *pans)
+{
+	char *ep;
+
+	*pans = strtol(s, &ep, 0);
+	return (*ep == 0);
+}