1/*
2** $Id: loslib.c $
3** Standard Operating System library
4** See Copyright Notice in lua.h
5*/
6
7#define loslib_c
8#define LUA_LIB
9
10#include "lprefix.h"
11
12
13#include <errno.h>
14#include <locale.h>
15#include <stdlib.h>
16#include <string.h>
17#include <time.h>
18
19#include "lua.h"
20
21#include "lauxlib.h"
22#include "lualib.h"
23
24
25/*
26** {==================================================================
27** List of valid conversion specifiers for the 'strftime' function;
28** options are grouped by length; group of length 2 start with '||'.
29** ===================================================================
30*/
31#if !defined(LUA_STRFTIMEOPTIONS) /* { */
32
33/* options for ANSI C 89 (only 1-char options) */
34#define L_STRFTIMEC89 "aAbBcdHIjmMpSUwWxXyYZ%"
35
36/* options for ISO C 99 and POSIX */
37#define L_STRFTIMEC99 "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%" \
38 "||" "EcECExEXEyEY" "OdOeOHOIOmOMOSOuOUOVOwOWOy" /* two-char options */
39
40/* options for Windows */
41#define L_STRFTIMEWIN "aAbBcdHIjmMpSUwWxXyYzZ%" \
42 "||" "#c#x#d#H#I#j#m#M#S#U#w#W#y#Y" /* two-char options */
43
44#if defined(LUA_USE_WINDOWS)
45#define LUA_STRFTIMEOPTIONS L_STRFTIMEWIN
46#elif defined(LUA_USE_C89)
47#define LUA_STRFTIMEOPTIONS L_STRFTIMEC89
48#else /* C99 specification */
49#define LUA_STRFTIMEOPTIONS L_STRFTIMEC99
50#endif
51
52#endif /* } */
53/* }================================================================== */
54
55
56/*
57** {==================================================================
58** Configuration for time-related stuff
59** ===================================================================
60*/
61
62/*
63** type to represent time_t in Lua
64*/
65#if !defined(LUA_NUMTIME) /* { */
66
67#define l_timet lua_Integer
68#define l_pushtime(L,t) lua_pushinteger(L,(lua_Integer)(t))
69#define l_gettime(L,arg) luaL_checkinteger(L, arg)
70
71#else /* }{ */
72
73#define l_timet lua_Number
74#define l_pushtime(L,t) lua_pushnumber(L,(lua_Number)(t))
75#define l_gettime(L,arg) luaL_checknumber(L, arg)
76
77#endif /* } */
78
79
80#if !defined(l_gmtime) /* { */
81/*
82** By default, Lua uses gmtime/localtime, except when POSIX is available,
83** where it uses gmtime_r/localtime_r
84*/
85
86#if defined(LUA_USE_POSIX) /* { */
87
88#define l_gmtime(t,r) gmtime_r(t,r)
89#define l_localtime(t,r) localtime_r(t,r)
90
91#else /* }{ */
92
93/* ISO C definitions */
94#define l_gmtime(t,r) ((void)(r)->tm_sec, gmtime(t))
95#define l_localtime(t,r) ((void)(r)->tm_sec, localtime(t))
96
97#endif /* } */
98
99#endif /* } */
100
101/* }================================================================== */
102
103
104/*
105** {==================================================================
106** Configuration for 'tmpnam':
107** By default, Lua uses tmpnam except when POSIX is available, where
108** it uses mkstemp.
109** ===================================================================
110*/
111#if !defined(lua_tmpnam) /* { */
112
113#if defined(LUA_USE_POSIX) /* { */
114
115#include <unistd.h>
116
117#define LUA_TMPNAMBUFSIZE 32
118
119#if !defined(LUA_TMPNAMTEMPLATE)
120#define LUA_TMPNAMTEMPLATE "/tmp/lua_XXXXXX"
121#endif
122
123#define lua_tmpnam(b,e) { \
124 strcpy(b, LUA_TMPNAMTEMPLATE); \
125 e = mkstemp(b); \
126 if (e != -1) close(e); \
127 e = (e == -1); }
128
129#else /* }{ */
130
131/* ISO C definitions */
132#define LUA_TMPNAMBUFSIZE L_tmpnam
133#define lua_tmpnam(b,e) { e = (tmpnam(b) == NULL); }
134
135#endif /* } */
136
137#endif /* } */
138/* }================================================================== */
139
140
141
142static int os_execute (lua_State *L) {
143 const char *cmd = luaL_optstring(L, 1, NULL);
144 int stat;
145 errno = 0;
146 stat = system(cmd);
147 if (cmd != NULL)
148 return luaL_execresult(L, stat);
149 else {
150 lua_pushboolean(L, stat); /* true if there is a shell */
151 return 1;
152 }
153}
154
155
156static int os_remove (lua_State *L) {
157 const char *filename = luaL_checkstring(L, 1);
158 return luaL_fileresult(L, remove(filename) == 0, filename);
159}
160
161
162static int os_rename (lua_State *L) {
163 const char *fromname = luaL_checkstring(L, 1);
164 const char *toname = luaL_checkstring(L, 2);
165 return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
166}
167
168
169static int os_tmpname (lua_State *L) {
170 char buff[LUA_TMPNAMBUFSIZE];
171 int err;
172 lua_tmpnam(buff, err);
173 if (err)
174 return luaL_error(L, "unable to generate a unique filename");
175 lua_pushstring(L, buff);
176 return 1;
177}
178
179
180static int os_getenv (lua_State *L) {
181 lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */
182 return 1;
183}
184
185
186static int os_clock (lua_State *L) {
187 lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
188 return 1;
189}
190
191
192/*
193** {======================================================
194** Time/Date operations
195** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
196** wday=%w+1, yday=%j, isdst=? }
197** =======================================================
198*/
199
200/*
201** About the overflow check: an overflow cannot occur when time
202** is represented by a lua_Integer, because either lua_Integer is
203** large enough to represent all int fields or it is not large enough
204** to represent a time that cause a field to overflow. However, if
205** times are represented as doubles and lua_Integer is int, then the
206** time 0x1.e1853b0d184f6p+55 would cause an overflow when adding 1900
207** to compute the year.
208*/
209static void setfield (lua_State *L, const char *key, int value, int delta) {
210 #if (defined(LUA_NUMTIME) && LUA_MAXINTEGER <= INT_MAX)
211 if (value > LUA_MAXINTEGER - delta)
212 luaL_error(L, "field '%s' is out-of-bound", key);
213 #endif
214 lua_pushinteger(L, (lua_Integer)value + delta);
215 lua_setfield(L, -2, key);
216}
217
218
219static void setboolfield (lua_State *L, const char *key, int value) {
220 if (value < 0) /* undefined? */
221 return; /* does not set field */
222 lua_pushboolean(L, value);
223 lua_setfield(L, -2, key);
224}
225
226
227/*
228** Set all fields from structure 'tm' in the table on top of the stack
229*/
230static void setallfields (lua_State *L, struct tm *stm) {
231 setfield(L, "year", stm->tm_year, 1900);
232 setfield(L, "month", stm->tm_mon, 1);
233 setfield(L, "day", stm->tm_mday, 0);
234 setfield(L, "hour", stm->tm_hour, 0);
235 setfield(L, "min", stm->tm_min, 0);
236 setfield(L, "sec", stm->tm_sec, 0);
237 setfield(L, "yday", stm->tm_yday, 1);
238 setfield(L, "wday", stm->tm_wday, 1);
239 setboolfield(L, "isdst", stm->tm_isdst);
240}
241
242
243static int getboolfield (lua_State *L, const char *key) {
244 int res;
245 res = (lua_getfield(L, -1, key) == LUA_TNIL) ? -1 : lua_toboolean(L, -1);
246 lua_pop(L, 1);
247 return res;
248}
249
250
251static int getfield (lua_State *L, const char *key, int d, int delta) {
252 int isnum;
253 int t = lua_getfield(L, -1, key); /* get field and its type */
254 lua_Integer res = lua_tointegerx(L, -1, &isnum);
255 if (!isnum) { /* field is not an integer? */
256 if (t != LUA_TNIL) /* some other value? */
257 return luaL_error(L, "field '%s' is not an integer", key);
258 else if (d < 0) /* absent field; no default? */
259 return luaL_error(L, "field '%s' missing in date table", key);
260 res = d;
261 }
262 else {
263 /* unsigned avoids overflow when lua_Integer has 32 bits */
264 if (!(res >= 0 ? (lua_Unsigned)res <= (lua_Unsigned)INT_MAX + delta
265 : (lua_Integer)INT_MIN + delta <= res))
266 return luaL_error(L, "field '%s' is out-of-bound", key);
267 res -= delta;
268 }
269 lua_pop(L, 1);
270 return (int)res;
271}
272
273
274static const char *checkoption (lua_State *L, const char *conv,
275 ptrdiff_t convlen, char *buff) {
276 const char *option = LUA_STRFTIMEOPTIONS;
277 int oplen = 1; /* length of options being checked */
278 for (; *option != '\0' && oplen <= convlen; option += oplen) {
279 if (*option == '|') /* next block? */
280 oplen++; /* will check options with next length (+1) */
281 else if (memcmp(conv, option, oplen) == 0) { /* match? */
282 memcpy(buff, conv, oplen); /* copy valid option to buffer */
283 buff[oplen] = '\0';
284 return conv + oplen; /* return next item */
285 }
286 }
287 luaL_argerror(L, 1,
288 lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
289 return conv; /* to avoid warnings */
290}
291
292
293static time_t l_checktime (lua_State *L, int arg) {
294 l_timet t = l_gettime(L, arg);
295 luaL_argcheck(L, (time_t)t == t, arg, "time out-of-bounds");
296 return (time_t)t;
297}
298
299
300/* maximum size for an individual 'strftime' item */
301#define SIZETIMEFMT 250
302
303
304static int os_date (lua_State *L) {
305 size_t slen;
306 const char *s = luaL_optlstring(L, 1, "%c", &slen);
307 time_t t = luaL_opt(L, l_checktime, 2, time(NULL));
308 const char *se = s + slen; /* 's' end */
309 struct tm tmr, *stm;
310 if (*s == '!') { /* UTC? */
311 stm = l_gmtime(&t, &tmr);
312 s++; /* skip '!' */
313 }
314 else
315 stm = l_localtime(&t, &tmr);
316 if (stm == NULL) /* invalid date? */
317 return luaL_error(L,
318 "date result cannot be represented in this installation");
319 if (strcmp(s, "*t") == 0) {
320 lua_createtable(L, 0, 9); /* 9 = number of fields */
321 setallfields(L, stm);
322 }
323 else {
324 char cc[4]; /* buffer for individual conversion specifiers */
325 luaL_Buffer b;
326 cc[0] = '%';
327 luaL_buffinit(L, &b);
328 while (s < se) {
329 if (*s != '%') /* not a conversion specifier? */
330 luaL_addchar(&b, *s++);
331 else {
332 size_t reslen;
333 char *buff = luaL_prepbuffsize(&b, SIZETIMEFMT);
334 s++; /* skip '%' */
335 s = checkoption(L, s, se - s, cc + 1); /* copy specifier to 'cc' */
336 reslen = strftime(buff, SIZETIMEFMT, cc, stm);
337 luaL_addsize(&b, reslen);
338 }
339 }
340 luaL_pushresult(&b);
341 }
342 return 1;
343}
344
345
346static int os_time (lua_State *L) {
347 time_t t;
348 if (lua_isnoneornil(L, 1)) /* called without args? */
349 t = time(NULL); /* get current time */
350 else {
351 struct tm ts;
352 luaL_checktype(L, 1, LUA_TTABLE);
353 lua_settop(L, 1); /* make sure table is at the top */
354 ts.tm_year = getfield(L, "year", -1, 1900);
355 ts.tm_mon = getfield(L, "month", -1, 1);
356 ts.tm_mday = getfield(L, "day", -1, 0);
357 ts.tm_hour = getfield(L, "hour", 12, 0);
358 ts.tm_min = getfield(L, "min", 0, 0);
359 ts.tm_sec = getfield(L, "sec", 0, 0);
360 ts.tm_isdst = getboolfield(L, "isdst");
361 t = mktime(&ts);
362 setallfields(L, &ts); /* update fields with normalized values */
363 }
364 if (t != (time_t)(l_timet)t || t == (time_t)(-1))
365 return luaL_error(L,
366 "time result cannot be represented in this installation");
367 l_pushtime(L, t);
368 return 1;
369}
370
371
372static int os_difftime (lua_State *L) {
373 time_t t1 = l_checktime(L, 1);
374 time_t t2 = l_checktime(L, 2);
375 lua_pushnumber(L, (lua_Number)difftime(t1, t2));
376 return 1;
377}
378
379/* }====================================================== */
380
381
382static int os_setlocale (lua_State *L) {
383 static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
384 LC_NUMERIC, LC_TIME};
385 static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
386 "numeric", "time", NULL};
387 const char *l = luaL_optstring(L, 1, NULL);
388 int op = luaL_checkoption(L, 2, "all", catnames);
389 lua_pushstring(L, setlocale(cat[op], l));
390 return 1;
391}
392
393
394static int os_exit (lua_State *L) {
395 int status;
396 if (lua_isboolean(L, 1))
397 status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
398 else
399 status = (int)luaL_optinteger(L, 1, EXIT_SUCCESS);
400 if (lua_toboolean(L, 2))
401 lua_close(L);
402 if (L) exit(status); /* 'if' to avoid warnings for unreachable 'return' */
403 return 0;
404}
405
406
407static const luaL_Reg syslib[] = {
408 {"clock", os_clock},
409 {"date", os_date},
410 {"difftime", os_difftime},
411 {"execute", os_execute},
412 {"exit", os_exit},
413 {"getenv", os_getenv},
414 {"remove", os_remove},
415 {"rename", os_rename},
416 {"setlocale", os_setlocale},
417 {"time", os_time},
418 {"tmpname", os_tmpname},
419 {NULL, NULL}
420};
421
422/* }====================================================== */
423
424
425
426LUAMOD_API int luaopen_os (lua_State *L) {
427 luaL_newlib(L, syslib);
428 return 1;
429}
430
431