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Diffstat (limited to 'src/lua-5.3/loslib.c')
-rw-r--r--src/lua-5.3/loslib.c409
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diff --git a/src/lua-5.3/loslib.c b/src/lua-5.3/loslib.c
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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
69static 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
141static 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
153static 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
159static 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
166static 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
177static 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
183static 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
197static void setfield (lua_State *L, const char *key, int value) {
198 lua_pushinteger(L, value);
199 lua_setfield(L, -2, key);
200}
201
202static 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*/
213static 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
226static 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
239static 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
260static 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
283static 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
325static 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
351static 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
361static 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
373static 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
386static 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
405LUAMOD_API int luaopen_os (lua_State *L) {
406 luaL_newlib(L, syslib);
407 return 1;
408}
409
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