ref: 440ccbc06007422f04943378260f250f9efa5331
dir: /sys/src/cmd/test.c/
/* * 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(int), e1(int), e2(int), e3(int); char *nxtarg(int); void main(int argc, char *argv[]) { int r; char *c; ac = argc; av = argv; ap = 1; if(EQ(argv[0],"[")) { if(!EQ(argv[--ac],"]")) synbad("] missing",""); } argv[ac] = 0; if (ac<=1) exits("usage"); r = e(1); if((c = nxtarg(1)) != nil) synbad("unexpected operator/operand: ", c); exits(r?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(int eval) { char *op; int p1; p1 = e1(eval); for(;;){ op = nxtarg(1); if(op == nil) break; if(!EQ(op, "-o")){ ap--; return p1; } if(!p1 && eval) p1 |= e1(1); else e1(0); } return p1; } int e1(int eval) { char *op; int p1; p1 = e2(eval); for(;;){ op = nxtarg(1); if(op == nil) break; if(!EQ(op, "-a")){ ap--; return p1; } if(p1 && eval) p1 &= e2(1); else e2(0); } return p1; } int e2(int eval) { char *op; int p1; p1 = 0; for(;;){ op = nxtarg(1); if(op == nil) return p1 ^ 1; if(!EQ(op, "!")) break; p1 ^= 1; } ap--; return(p1^e3(eval)); } int e3(int eval) { int p1, int1, int2; char *a, *b, *p2; a = nxtarg(0); if(EQ(a, "(")) { p1 = e(eval); if(!EQ(nxtarg(0), ")")) synbad(") expected",""); return(p1); } if(EQ(a, "-A")){ b = nxtarg(0); return(eval && hasmode(b, DMAPPEND)); } if(EQ(a, "-L")){ b = nxtarg(0); return(eval && hasmode(b, DMEXCL)); } if(EQ(a, "-T")){ b = nxtarg(0); return(eval && hasmode(b, DMTMP)); } if(EQ(a, "-f")){ b = nxtarg(0); return(eval && isreg(b)); } if(EQ(a, "-d")){ b = nxtarg(0); return(eval && isdir(b)); } if(EQ(a, "-r")){ b = nxtarg(0); return(eval && tio(b, AREAD)); } if(EQ(a, "-w")){ b = nxtarg(0); return(eval && tio(b, AWRITE)); } if(EQ(a, "-x")){ b = nxtarg(0); return(eval && tio(b, AEXEC)); } if(EQ(a, "-e")){ b = nxtarg(0); return(eval && tio(b, AEXIST)); } 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")){ b = nxtarg(0); return(eval && fsizep(b)); } if(EQ(a, "-t")) if(ap>=ac) return(eval && isatty(1)); else if(nxtintarg(&int1)) return(eval && isatty(int1)); else synbad("not a valid file descriptor number ", ""); 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")){ b = nxtarg(0); return(eval && isolder(b, a)); } if(EQ(p2, "-ot")){ b = nxtarg(0); return(eval && isolderthan(b, a)); } if(EQ(p2, "-nt")){ b = nxtarg(0); return(eval && isnewerthan(b, a)); } if(isint(a, &int1)){ 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); ap--; } } ap--; return !EQ(a, ""); } int tio(char *a, int f) { return access (a, f) >= 0; } /* * note that the name strings pointed to by Dir members are * allocated with the Dir itself (by the same call to malloc), * but are not included in sizeof(Dir), so copying a Dir won't * copy the strings it points to. */ int hasmode(char *f, ulong m) { int r; Dir *dir; dir = dirstat(f); if (dir == nil) return 0; r = (dir->mode & m) != 0; free(dir); return r; } int isdir(char *f) { return hasmode(f, DMDIR); } int isreg(char *f) { int r; Dir *dir; dir = dirstat(f); if (dir == nil) return 0; r = (dir->mode & DMDIR) == 0; free(dir); return r; } int isatty(int fd) { int r; Dir *d1, *d2; d1 = dirfstat(fd); d2 = dirstat("/dev/cons"); if (d1 == nil || d2 == nil) r = 0; else r = d1->type == d2->type && d1->dev == d2->dev && d1->qid.path == d2->qid.path; free(d1); free(d2); return r; } int fsizep(char *f) { int r; Dir *dir; dir = dirstat(f); if (dir == nil) return 0; r = dir->length > 0; free(dir); return r; } 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) { int r; ulong n, m; char *p = pin; Dir *dir; dir = dirstat(f); if (dir == nil) return 0; /* parse time */ n = 0; r = 1; while(*p){ m = strtoul(p, &p, 0); switch(*p){ case 0: n = m; r = 0; 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); } } if (r != 0) n = time(0) - n; r = dir->mtime < n; free(dir); return r; } int isolderthan(char *a, char *b) { int r; Dir *ad, *bd; ad = dirstat(a); bd = dirstat(b); if (ad == nil || bd == nil) r = 0; else r = ad->mtime > bd->mtime; free(ad); free(bd); return r; } int isnewerthan(char *a, char *b) { int r; Dir *ad, *bd; ad = dirstat(a); bd = dirstat(b); if (ad == nil || bd == nil) r = 0; else r = ad->mtime < bd->mtime; free(ad); free(bd); return r; }