test.c - 9base - revived minimalist port of Plan 9 userland to Unix
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test.c (5783B)
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1 /*
2 * POSIX standard
3 * test expression
4 * [ expression ]
5 *
6 * Plan 9 additions:
7 * -A file exists and is append-only
8 * -L file exists and is exclusive-use
9 * -T file exists and is temporary
10 */
11
12 #include <u.h>
13 #include <libc.h>
14
15 #define isatty plan9_isatty
16
17 #define EQ(a,b) ((tmp=a)==0?0:(strcmp(tmp,b)==0))
18
19 int ap;
20 int ac;
21 char **av;
22 char *tmp;
23
24 void synbad(char *, char *);
25 int fsizep(char *);
26 int isdir(char *);
27 int isreg(char *);
28 int isatty(int);
29 int isint(char *, int *);
30 int isolder(char *, char *);
31 int isolderthan(char *, char *);
32 int isnewerthan(char *, char *);
33 int hasmode(char *, ulong);
34 int tio(char *, int);
35 int e(void), e1(void), e2(void), e3(void);
36 char *nxtarg(int);
37
38 void
39 main(int argc, char *argv[])
40 {
41 int r;
42 char *c;
43
44 ac = argc; av = argv; ap = 1;
45 if(EQ(argv[0],"[")) {
46 if(!EQ(argv[--ac],"]"))
47 synbad("] missing","");
48 }
49 argv[ac] = 0;
50 if (ac<=1)
51 exits("usage");
52 r = e();
53 /*
54 * nice idea but short-circuit -o and -a operators may have
55 * not consumed their right-hand sides.
56 */
57 if(0 && (c = nxtarg(1)) != nil)
58 synbad("unexpected operator/operand: ", c);
59 exits(r?0:"false");
60 }
61
62 char *
63 nxtarg(int mt)
64 {
65 if(ap>=ac){
66 if(mt){
67 ap++;
68 return(0);
69 }
70 synbad("argument expected","");
71 }
72 return(av[ap++]);
73 }
74
75 int
76 nxtintarg(int *pans)
77 {
78 if(ap<ac && isint(av[ap], pans)){
79 ap++;
80 return 1;
81 }
82 return 0;
83 }
84
85 int
86 e(void)
87 {
88 int p1;
89
90 p1 = e1();
91 if (EQ(nxtarg(1), "-o"))
92 return(p1 || e());
93 ap--;
94 return(p1);
95 }
96
97 int
98 e1(void)
99 {
100 int p1;
101
102 p1 = e2();
103 if (EQ(nxtarg(1), "-a"))
104 return (p1 && e1());
105 ap--;
106 return(p1);
107 }
108
109 int
110 e2(void)
111 {
112 if (EQ(nxtarg(0), "!"))
113 return(!e2());
114 ap--;
115 return(e3());
116 }
117
118 int
119 e3(void)
120 {
121 int p1, int1, int2;
122 char *a, *p2;
123
124 a = nxtarg(0);
125 if(EQ(a, "(")) {
126 p1 = e();
127 if(!EQ(nxtarg(0), ")"))
128 synbad(") expected","");
129 return(p1);
130 }
131
132 if(EQ(a, "-A"))
133 return(hasmode(nxtarg(0), DMAPPEND));
134
135 if(EQ(a, "-L"))
136 return(hasmode(nxtarg(0), DMEXCL));
137
138 if(EQ(a, "-T"))
139 return(hasmode(nxtarg(0), DMTMP));
140
141 if(EQ(a, "-f"))
142 return(isreg(nxtarg(0)));
143
144 if(EQ(a, "-d"))
145 return(isdir(nxtarg(0)));
146
147 if(EQ(a, "-r"))
148 return(tio(nxtarg(0), 4));
149
150 if(EQ(a, "-w"))
151 return(tio(nxtarg(0), 2));
152
153 if(EQ(a, "-x"))
154 return(tio(nxtarg(0), 1));
155
156 if(EQ(a, "-e"))
157 return(tio(nxtarg(0), 0));
158
159 if(EQ(a, "-c"))
160 return(0);
161
162 if(EQ(a, "-b"))
163 return(0);
164
165 if(EQ(a, "-u"))
166 return(0);
167
168 if(EQ(a, "-g"))
169 return(0);
170
171 if(EQ(a, "-s"))
172 return(fsizep(nxtarg(0)));
173
174 if(EQ(a, "-t"))
175 if(ap>=ac)
176 return(isatty(1));
177 else if(nxtintarg(&int1))
178 return(isatty(int1));
179 else
180 synbad("not a valid file descriptor number ", "");
181
182 if(EQ(a, "-n"))
183 return(!EQ(nxtarg(0), ""));
184 if(EQ(a, "-z"))
185 return(EQ(nxtarg(0), ""));
186
187 p2 = nxtarg(1);
188 if (p2==0)
189 return(!EQ(a,""));
190 if(EQ(p2, "="))
191 return(EQ(nxtarg(0), a));
192
193 if(EQ(p2, "!="))
194 return(!EQ(nxtarg(0), a));
195
196 if(EQ(p2, "-older"))
197 return(isolder(nxtarg(0), a));
198
199 if(EQ(p2, "-ot"))
200 return(isolderthan(nxtarg(0), a));
201
202 if(EQ(p2, "-nt"))
203 return(isnewerthan(nxtarg(0), a));
204
205 if(!isint(a, &int1))
206 synbad("unexpected operator/operand: ", p2);
207
208 if(nxtintarg(&int2)){
209 if(EQ(p2, "-eq"))
210 return(int1==int2);
211 if(EQ(p2, "-ne"))
212 return(int1!=int2);
213 if(EQ(p2, "-gt"))
214 return(int1>int2);
215 if(EQ(p2, "-lt"))
216 return(int1<int2);
217 if(EQ(p2, "-ge"))
218 return(int1>=int2);
219 if(EQ(p2, "-le"))
220 return(int1<=int2);
221 }
222
223 synbad("unknown operator ",p2);
224 return 0; /* to shut ken up */
225 }
226
227 int
228 tio(char *a, int f)
229 {
230 return access (a, f) >= 0;
231 }
232
233 /* copy to local memory; clear names for safety */
234 int
235 localstat(char *f, Dir *dir)
236 {
237 Dir *d;
238
239 d = dirstat(f);
240 if(d == nil)
241 return(-1);
242 *dir = *d;
243 free(d);
244 dir->name = 0;
245 dir->uid = 0;
246 dir->gid = 0;
247 dir->muid = 0;
248 return 0;
249 }
250
251 /* copy to local memory; clear names for safety */
252 int
253 localfstat(int f, Dir *dir)
254 {
255 Dir *d;
256
257 d = dirfstat(f);
258 if(d == nil)
259 return(-1);
260 *dir = *d;
261 free(d);
262 dir->name = 0;
263 dir->uid = 0;
264 dir->gid = 0;
265 dir->muid = 0;
266 return 0;
267 }
268
269 int
270 hasmode(char *f, ulong m)
271 {
272 Dir dir;
273
274 if(localstat(f,&dir)<0)
275 return(0);
276 return(dir.mode&m);
277 }
278
279 int
280 isdir(char *f)
281 {
282 Dir dir;
283
284 if(localstat(f,&dir)<0)
285 return(0);
286 return(dir.mode&DMDIR);
287 }
288
289 int
290 isreg(char *f)
291 {
292 Dir dir;
293
294 if(localstat(f,&dir)<0)
295 return(0);
296 return(!(dir.mode&DMDIR));
297 }
298
299 int
300 isatty(int fd)
301 {
302 Dir d1, d2;
303
304 if(localfstat(fd, &d1) < 0)
305 return 0;
306 if(localstat("/dev/cons", &d2) < 0)
307 return 0;
308 return d1.type==d2.type && d1.dev==d2.dev && d1.qid.path==d2.qid.path;
309 }
310
311 int
312 fsizep(char *f)
313 {
314 Dir dir;
315
316 if(localstat(f,&dir)<0)
317 return(0);
318 return(dir.length>0);
319 }
320
321 void
322 synbad(char *s1, char *s2)
323 {
324 int len;
325
326 write(2, "test: ", 6);
327 if ((len = strlen(s1)) != 0)
328 write(2, s1, len);
329 if ((len = strlen(s2)) != 0)
330 write(2, s2, len);
331 write(2, "\n", 1);
332 exits("bad syntax");
333 }
334
335 int
336 isint(char *s, int *pans)
337 {
338 char *ep;
339
340 *pans = strtol(s, &ep, 0);
341 return (*ep == 0);
342 }
343
344 int
345 isolder(char *pin, char *f)
346 {
347 char *p = pin;
348 ulong n, m;
349 Dir dir;
350
351 if(localstat(f,&dir)<0)
352 return(0);
353
354 /* parse time */
355 n = 0;
356 while(*p){
357 m = strtoul(p, &p, 0);
358 switch(*p){
359 case 0:
360 n = m;
361 break;
362 case 'y':
363 m *= 12;
364 /* fall through */
365 case 'M':
366 m *= 30;
367 /* fall through */
368 case 'd':
369 m *= 24;
370 /* fall through */
371 case 'h':
372 m *= 60;
373 /* fall through */
374 case 'm':
375 m *= 60;
376 /* fall through */
377 case 's':
378 n += m;
379 p++;
380 break;
381 default:
382 synbad("bad time syntax, ", pin);
383 }
384 }
385
386 return(dir.mtime+n < time(0));
387 }
388
389 int
390 isolderthan(char *a, char *b)
391 {
392 Dir ad, bd;
393
394 if(localstat(a, &ad)<0)
395 return(0);
396 if(localstat(b, &bd)<0)
397 return(0);
398 return ad.mtime > bd.mtime;
399 }
400
401 int
402 isnewerthan(char *a, char *b)
403 {
404 Dir ad, bd;
405
406 if(localstat(a, &ad)<0)
407 return(0);
408 if(localstat(b, &bd)<0)
409 return(0);
410 return ad.mtime < bd.mtime;
411 }