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1 /*
2 ** $Id: loslib.c,v 1.65.1.1 2017/04/19 17:29:57 roberto Exp $
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 #if !defined(l_time_t)		/* { */
63 /*
64 ** type to represent time_t in Lua
65 */
66 #define l_timet			lua_Integer
67 #define l_pushtime(L,t)		lua_pushinteger(L,(lua_Integer)(t))
68 
l_checktime(lua_State * L,int arg)69 static time_t l_checktime (lua_State *L, int arg) {
70   lua_Integer t = luaL_checkinteger(L, arg);
71   luaL_argcheck(L, (time_t)t == t, arg, "time out-of-bounds");
72   return (time_t)t;
73 }
74 
75 #endif				/* } */
76 
77 
78 #if !defined(l_gmtime)		/* { */
79 /*
80 ** By default, Lua uses gmtime/localtime, except when POSIX is available,
81 ** where it uses gmtime_r/localtime_r
82 */
83 
84 #if defined(LUA_USE_POSIX)	/* { */
85 
86 #define l_gmtime(t,r)		gmtime_r(t,r)
87 #define l_localtime(t,r)	localtime_r(t,r)
88 
89 #else				/* }{ */
90 
91 /* ISO C definitions */
92 #define l_gmtime(t,r)		((void)(r)->tm_sec, gmtime(t))
93 #define l_localtime(t,r)  	((void)(r)->tm_sec, localtime(t))
94 
95 #endif				/* } */
96 
97 #endif				/* } */
98 
99 /* }================================================================== */
100 
101 
102 /*
103 ** {==================================================================
104 ** Configuration for 'tmpnam':
105 ** By default, Lua uses tmpnam except when POSIX is available, where
106 ** it uses mkstemp.
107 ** ===================================================================
108 */
109 #if !defined(lua_tmpnam)	/* { */
110 
111 #if defined(LUA_USE_POSIX)	/* { */
112 
113 #include <unistd.h>
114 
115 #define LUA_TMPNAMBUFSIZE	32
116 
117 #if !defined(LUA_TMPNAMTEMPLATE)
118 #define LUA_TMPNAMTEMPLATE	"/tmp/lua_XXXXXX"
119 #endif
120 
121 #define lua_tmpnam(b,e) { \
122         strcpy(b, LUA_TMPNAMTEMPLATE); \
123         e = mkstemp(b); \
124         if (e != -1) close(e); \
125         e = (e == -1); }
126 
127 #else				/* }{ */
128 
129 /* ISO C definitions */
130 #define LUA_TMPNAMBUFSIZE	L_tmpnam
131 #define lua_tmpnam(b,e)		{ e = (tmpnam(b) == NULL); }
132 
133 #endif				/* } */
134 
135 #endif				/* } */
136 /* }================================================================== */
137 
138 
139 
140 
os_execute(lua_State * L)141 static int os_execute (lua_State *L) {
142   const char *cmd = luaL_optstring(L, 1, NULL);
143   int stat = system(cmd);
144   if (cmd != NULL)
145     return luaL_execresult(L, stat);
146   else {
147     lua_pushboolean(L, stat);  /* true if there is a shell */
148     return 1;
149   }
150 }
151 
152 
os_remove(lua_State * L)153 static int os_remove (lua_State *L) {
154   const char *filename = luaL_checkstring(L, 1);
155   return luaL_fileresult(L, remove(filename) == 0, filename);
156 }
157 
158 
os_rename(lua_State * L)159 static int os_rename (lua_State *L) {
160   const char *fromname = luaL_checkstring(L, 1);
161   const char *toname = luaL_checkstring(L, 2);
162   return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
163 }
164 
165 
os_tmpname(lua_State * L)166 static int os_tmpname (lua_State *L) {
167   char buff[LUA_TMPNAMBUFSIZE];
168   int err;
169   lua_tmpnam(buff, err);
170   if (err)
171     return luaL_error(L, "unable to generate a unique filename");
172   lua_pushstring(L, buff);
173   return 1;
174 }
175 
176 
os_getenv(lua_State * L)177 static int os_getenv (lua_State *L) {
178   lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
179   return 1;
180 }
181 
182 
os_clock(lua_State * L)183 static int os_clock (lua_State *L) {
184   lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
185   return 1;
186 }
187 
188 
189 /*
190 ** {======================================================
191 ** Time/Date operations
192 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
193 **   wday=%w+1, yday=%j, isdst=? }
194 ** =======================================================
195 */
196 
setfield(lua_State * L,const char * key,int value)197 static void setfield (lua_State *L, const char *key, int value) {
198   lua_pushinteger(L, value);
199   lua_setfield(L, -2, key);
200 }
201 
setboolfield(lua_State * L,const char * key,int value)202 static void setboolfield (lua_State *L, const char *key, int value) {
203   if (value < 0)  /* undefined? */
204     return;  /* does not set field */
205   lua_pushboolean(L, value);
206   lua_setfield(L, -2, key);
207 }
208 
209 
210 /*
211 ** Set all fields from structure 'tm' in the table on top of the stack
212 */
setallfields(lua_State * L,struct tm * stm)213 static void setallfields (lua_State *L, struct tm *stm) {
214   setfield(L, "sec", stm->tm_sec);
215   setfield(L, "min", stm->tm_min);
216   setfield(L, "hour", stm->tm_hour);
217   setfield(L, "day", stm->tm_mday);
218   setfield(L, "month", stm->tm_mon + 1);
219   setfield(L, "year", stm->tm_year + 1900);
220   setfield(L, "wday", stm->tm_wday + 1);
221   setfield(L, "yday", stm->tm_yday + 1);
222   setboolfield(L, "isdst", stm->tm_isdst);
223 }
224 
225 
getboolfield(lua_State * L,const char * key)226 static int getboolfield (lua_State *L, const char *key) {
227   int res;
228   res = (lua_getfield(L, -1, key) == LUA_TNIL) ? -1 : lua_toboolean(L, -1);
229   lua_pop(L, 1);
230   return res;
231 }
232 
233 
234 /* maximum value for date fields (to avoid arithmetic overflows with 'int') */
235 #if !defined(L_MAXDATEFIELD)
236 #define L_MAXDATEFIELD	(INT_MAX / 2)
237 #endif
238 
getfield(lua_State * L,const char * key,int d,int delta)239 static int getfield (lua_State *L, const char *key, int d, int delta) {
240   int isnum;
241   int t = lua_getfield(L, -1, key);  /* get field and its type */
242   lua_Integer res = lua_tointegerx(L, -1, &isnum);
243   if (!isnum) {  /* field is not an integer? */
244     if (t != LUA_TNIL)  /* some other value? */
245       return luaL_error(L, "field '%s' is not an integer", key);
246     else if (d < 0)  /* absent field; no default? */
247       return luaL_error(L, "field '%s' missing in date table", key);
248     res = d;
249   }
250   else {
251     if (!(-L_MAXDATEFIELD <= res && res <= L_MAXDATEFIELD))
252       return luaL_error(L, "field '%s' is out-of-bound", key);
253     res -= delta;
254   }
255   lua_pop(L, 1);
256   return (int)res;
257 }
258 
259 
checkoption(lua_State * L,const char * conv,ptrdiff_t convlen,char * buff)260 static const char *checkoption (lua_State *L, const char *conv,
261                                 ptrdiff_t convlen, char *buff) {
262   const char *option = LUA_STRFTIMEOPTIONS;
263   int oplen = 1;  /* length of options being checked */
264   for (; *option != '\0' && oplen <= convlen; option += oplen) {
265     if (*option == '|')  /* next block? */
266       oplen++;  /* will check options with next length (+1) */
267     else if (memcmp(conv, option, oplen) == 0) {  /* match? */
268       memcpy(buff, conv, oplen);  /* copy valid option to buffer */
269       buff[oplen] = '\0';
270       return conv + oplen;  /* return next item */
271     }
272   }
273   luaL_argerror(L, 1,
274     lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
275   return conv;  /* to avoid warnings */
276 }
277 
278 
279 /* maximum size for an individual 'strftime' item */
280 #define SIZETIMEFMT	250
281 
282 
os_date(lua_State * L)283 static int os_date (lua_State *L) {
284   size_t slen;
285   const char *s = luaL_optlstring(L, 1, "%c", &slen);
286   time_t t = luaL_opt(L, l_checktime, 2, time(NULL));
287   const char *se = s + slen;  /* 's' end */
288   struct tm tmr, *stm;
289   if (*s == '!') {  /* UTC? */
290     stm = l_gmtime(&t, &tmr);
291     s++;  /* skip '!' */
292   }
293   else
294     stm = l_localtime(&t, &tmr);
295   if (stm == NULL)  /* invalid date? */
296     return luaL_error(L,
297                  "time result cannot be represented in this installation");
298   if (strcmp(s, "*t") == 0) {
299     lua_createtable(L, 0, 9);  /* 9 = number of fields */
300     setallfields(L, stm);
301   }
302   else {
303     char cc[4];  /* buffer for individual conversion specifiers */
304     luaL_Buffer b;
305     cc[0] = '%';
306     luaL_buffinit(L, &b);
307     while (s < se) {
308       if (*s != '%')  /* not a conversion specifier? */
309         luaL_addchar(&b, *s++);
310       else {
311         size_t reslen;
312         char *buff = luaL_prepbuffsize(&b, SIZETIMEFMT);
313         s++;  /* skip '%' */
314         s = checkoption(L, s, se - s, cc + 1);  /* copy specifier to 'cc' */
315         reslen = strftime(buff, SIZETIMEFMT, cc, stm);
316         luaL_addsize(&b, reslen);
317       }
318     }
319     luaL_pushresult(&b);
320   }
321   return 1;
322 }
323 
324 
os_time(lua_State * L)325 static int os_time (lua_State *L) {
326   time_t t;
327   if (lua_isnoneornil(L, 1))  /* called without args? */
328     t = time(NULL);  /* get current time */
329   else {
330     struct tm ts;
331     luaL_checktype(L, 1, LUA_TTABLE);
332     lua_settop(L, 1);  /* make sure table is at the top */
333     ts.tm_sec = getfield(L, "sec", 0, 0);
334     ts.tm_min = getfield(L, "min", 0, 0);
335     ts.tm_hour = getfield(L, "hour", 12, 0);
336     ts.tm_mday = getfield(L, "day", -1, 0);
337     ts.tm_mon = getfield(L, "month", -1, 1);
338     ts.tm_year = getfield(L, "year", -1, 1900);
339     ts.tm_isdst = getboolfield(L, "isdst");
340     t = mktime(&ts);
341     setallfields(L, &ts);  /* update fields with normalized values */
342   }
343   if (t != (time_t)(l_timet)t || t == (time_t)(-1))
344     return luaL_error(L,
345                   "time result cannot be represented in this installation");
346   l_pushtime(L, t);
347   return 1;
348 }
349 
350 
os_difftime(lua_State * L)351 static int os_difftime (lua_State *L) {
352   time_t t1 = l_checktime(L, 1);
353   time_t t2 = l_checktime(L, 2);
354   lua_pushnumber(L, (lua_Number)difftime(t1, t2));
355   return 1;
356 }
357 
358 /* }====================================================== */
359 
360 
os_setlocale(lua_State * L)361 static int os_setlocale (lua_State *L) {
362   static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
363                       LC_NUMERIC, LC_TIME};
364   static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
365      "numeric", "time", NULL};
366   const char *l = luaL_optstring(L, 1, NULL);
367   int op = luaL_checkoption(L, 2, "all", catnames);
368   lua_pushstring(L, setlocale(cat[op], l));
369   return 1;
370 }
371 
372 
os_exit(lua_State * L)373 static int os_exit (lua_State *L) {
374   int status;
375   if (lua_isboolean(L, 1))
376     status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
377   else
378     status = (int)luaL_optinteger(L, 1, EXIT_SUCCESS);
379   if (lua_toboolean(L, 2))
380     lua_close(L);
381   if (L) exit(status);  /* 'if' to avoid warnings for unreachable 'return' */
382   return 0;
383 }
384 
385 
386 static const luaL_Reg syslib[] = {
387   {"clock",     os_clock},
388   {"date",      os_date},
389   {"difftime",  os_difftime},
390   {"execute",   os_execute},
391   {"exit",      os_exit},
392   {"getenv",    os_getenv},
393   {"remove",    os_remove},
394   {"rename",    os_rename},
395   {"setlocale", os_setlocale},
396   {"time",      os_time},
397   {"tmpname",   os_tmpname},
398   {NULL, NULL}
399 };
400 
401 /* }====================================================== */
402 
403 
404 
luaopen_os(lua_State * L)405 LUAMOD_API int luaopen_os (lua_State *L) {
406   luaL_newlib(L, syslib);
407   return 1;
408 }
409 
410