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- /*
- * POSIX standard
- * test expression
- * [ expression ]
- *
- * Plan 9 additions:
- * -A file exists and is append-only
- * -L file exists and is exclusive-use
- * -T file exists and is temporary
- */
- #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 isolder(char *, char *);
- int isolderthan(char *, char *);
- int isnewerthan(char *, char *);
- 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, "-T"))
- return(hasmode(nxtarg(0), DMTMP));
- 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(EQ(p2, "-older"))
- return(isolder(nxtarg(0), a));
- if(EQ(p2, "-ot"))
- return(isolderthan(nxtarg(0), a));
- if(EQ(p2, "-nt"))
- return(isnewerthan(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);
- }
- int
- isolder(char *pin, char *f)
- {
- char *p = pin;
- ulong n, m;
- Dir dir;
- if(localstat(f,&dir)<0)
- return(0);
- /* parse time */
- n = 0;
- while(*p){
- m = strtoul(p, &p, 0);
- switch(*p){
- case 0:
- n = m;
- break;
- case 'y':
- m *= 12;
- /* fall through */
- case 'M':
- m *= 30;
- /* fall through */
- case 'd':
- m *= 24;
- /* fall through */
- case 'h':
- m *= 60;
- /* fall through */
- case 'm':
- m *= 60;
- /* fall through */
- case 's':
- n += m;
- p++;
- break;
- default:
- synbad("bad time syntax, ", pin);
- }
- }
- return(dir.mtime+n < time(0));
- }
- int
- isolderthan(char *a, char *b)
- {
- Dir ad, bd;
- if(localstat(a, &ad)<0)
- return(0);
- if(localstat(b, &bd)<0)
- return(0);
- return ad.mtime > bd.mtime;
- }
- int
- isnewerthan(char *a, char *b)
- {
- Dir ad, bd;
- if(localstat(a, &ad)<0)
- return(0);
- if(localstat(b, &bd)<0)
- return(0);
- return ad.mtime < bd.mtime;
- }
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