1 /* $NetBSD: loslib.c,v 1.4 2015/10/08 13:21:00 mbalmer Exp $ */
2
3 /*
4 ** Id: loslib.c,v 1.57 2015/04/10 17:41:04 roberto Exp
5 ** Standard Operating System library
6 ** See Copyright Notice in lua.h
7 */
8
9 #define loslib_c
10 #define LUA_LIB
11
12 #include "lprefix.h"
13
14
15 #include <errno.h>
16 #include <locale.h>
17 #include <stdlib.h>
18 #include <string.h>
19 #include <time.h>
20
21 #include "lua.h"
22
23 #include "lauxlib.h"
24 #include "lualib.h"
25
26
27 /*
28 ** {==================================================================
29 ** list of valid conversion specifiers for the 'strftime' function
30 ** ===================================================================
31 */
32 #if !defined(LUA_STRFTIMEOPTIONS) /* { */
33
34 #if defined(LUA_USE_C89)
35 #define LUA_STRFTIMEOPTIONS { "aAbBcdHIjmMpSUwWxXyYz%", "" }
36 #else /* C99 specification */
37 #define LUA_STRFTIMEOPTIONS \
38 { "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%", "", \
39 "E", "cCxXyY", \
40 "O", "deHImMSuUVwWy" }
41 #endif
42
43 #endif /* } */
44 /* }================================================================== */
45
46
47 /*
48 ** {==================================================================
49 ** Configuration for time-related stuff
50 ** ===================================================================
51 */
52
53 #if !defined(l_time_t) /* { */
54 /*
55 ** type to represent time_t in Lua
56 */
57 #define l_timet lua_Integer
58 #define l_pushtime(L,t) lua_pushinteger(L,(lua_Integer)(t))
59 #define l_checktime(L,a) ((time_t)luaL_checkinteger(L,a))
60
61 #endif /* } */
62
63
64 #if !defined(l_gmtime) /* { */
65 /*
66 ** By default, Lua uses gmtime/localtime, except when POSIX is available,
67 ** where it uses gmtime_r/localtime_r
68 */
69
70 #if defined(LUA_USE_POSIX) /* { */
71
72 #define l_gmtime(t,r) gmtime_r(t,r)
73 #define l_localtime(t,r) localtime_r(t,r)
74
75 #else /* }{ */
76
77 /* ISO C definitions */
78 #define l_gmtime(t,r) ((void)(r)->tm_sec, gmtime(t))
79 #define l_localtime(t,r) ((void)(r)->tm_sec, localtime(t))
80
81 #endif /* } */
82
83 #endif /* } */
84
85 /* }================================================================== */
86
87
88 /*
89 ** {==================================================================
90 ** Configuration for 'tmpnam':
91 ** By default, Lua uses tmpnam except when POSIX is available, where
92 ** it uses mkstemp.
93 ** ===================================================================
94 */
95 #if !defined(lua_tmpnam) /* { */
96
97 #if defined(LUA_USE_POSIX) /* { */
98
99 #include <unistd.h>
100
101 #define LUA_TMPNAMBUFSIZE 32
102
103 #if !defined(LUA_TMPNAMTEMPLATE)
104 #define LUA_TMPNAMTEMPLATE "/tmp/lua_XXXXXX"
105 #endif
106
107 #define lua_tmpnam(b,e) { \
108 strcpy(b, LUA_TMPNAMTEMPLATE); \
109 e = mkstemp(b); \
110 if (e != -1) close(e); \
111 e = (e == -1); }
112
113 #else /* }{ */
114
115 /* ISO C definitions */
116 #define LUA_TMPNAMBUFSIZE L_tmpnam
117 #define lua_tmpnam(b,e) { e = (tmpnam(b) == NULL); }
118
119 #endif /* } */
120
121 #endif /* } */
122 /* }================================================================== */
123
124
125
126
os_execute(lua_State * L)127 static int os_execute (lua_State *L) {
128 const char *cmd = luaL_optstring(L, 1, NULL);
129 int stat = system(cmd);
130 if (cmd != NULL)
131 return luaL_execresult(L, stat);
132 else {
133 lua_pushboolean(L, stat); /* true if there is a shell */
134 return 1;
135 }
136 }
137
138
os_remove(lua_State * L)139 static int os_remove (lua_State *L) {
140 const char *filename = luaL_checkstring(L, 1);
141 return luaL_fileresult(L, remove(filename) == 0, filename);
142 }
143
144
os_rename(lua_State * L)145 static int os_rename (lua_State *L) {
146 const char *fromname = luaL_checkstring(L, 1);
147 const char *toname = luaL_checkstring(L, 2);
148 return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
149 }
150
151
os_tmpname(lua_State * L)152 static int os_tmpname (lua_State *L) {
153 char buff[LUA_TMPNAMBUFSIZE];
154 int err;
155 lua_tmpnam(buff, err);
156 if (err)
157 return luaL_error(L, "unable to generate a unique filename");
158 lua_pushstring(L, buff);
159 return 1;
160 }
161
162
os_getenv(lua_State * L)163 static int os_getenv (lua_State *L) {
164 lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */
165 return 1;
166 }
167
168
os_clock(lua_State * L)169 static int os_clock (lua_State *L) {
170 lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
171 return 1;
172 }
173
174
175 /*
176 ** {======================================================
177 ** Time/Date operations
178 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
179 ** wday=%w+1, yday=%j, isdst=? }
180 ** =======================================================
181 */
182
setfield(lua_State * L,const char * key,int value)183 static void setfield (lua_State *L, const char *key, int value) {
184 lua_pushinteger(L, value);
185 lua_setfield(L, -2, key);
186 }
187
setboolfield(lua_State * L,const char * key,int value)188 static void setboolfield (lua_State *L, const char *key, int value) {
189 if (value < 0) /* undefined? */
190 return; /* does not set field */
191 lua_pushboolean(L, value);
192 lua_setfield(L, -2, key);
193 }
194
getboolfield(lua_State * L,const char * key)195 static int getboolfield (lua_State *L, const char *key) {
196 int res;
197 res = (lua_getfield(L, -1, key) == LUA_TNIL) ? -1 : lua_toboolean(L, -1);
198 lua_pop(L, 1);
199 return res;
200 }
201
202
getfield(lua_State * L,const char * key,int d)203 static int getfield (lua_State *L, const char *key, int d) {
204 int res, isnum;
205 lua_getfield(L, -1, key);
206 res = (int)lua_tointegerx(L, -1, &isnum);
207 if (!isnum) {
208 if (d < 0)
209 return luaL_error(L, "field '%s' missing in date table", key);
210 res = d;
211 }
212 lua_pop(L, 1);
213 return res;
214 }
215
216
checkoption(lua_State * L,const char * conv,char * buff)217 static const char *checkoption (lua_State *L, const char *conv, char *buff) {
218 static const char *const options[] = LUA_STRFTIMEOPTIONS;
219 unsigned int i;
220 for (i = 0; i < sizeof(options)/sizeof(options[0]); i += 2) {
221 if (*conv != '\0' && strchr(options[i], *conv) != NULL) {
222 buff[1] = *conv;
223 if (*options[i + 1] == '\0') { /* one-char conversion specifier? */
224 buff[2] = '\0'; /* end buffer */
225 return conv + 1;
226 }
227 else if (*(conv + 1) != '\0' &&
228 strchr(options[i + 1], *(conv + 1)) != NULL) {
229 buff[2] = *(conv + 1); /* valid two-char conversion specifier */
230 buff[3] = '\0'; /* end buffer */
231 return conv + 2;
232 }
233 }
234 }
235 luaL_argerror(L, 1,
236 lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
237 return conv; /* to avoid warnings */
238 }
239
240
os_date(lua_State * L)241 static int os_date (lua_State *L) {
242 const char *s = luaL_optstring(L, 1, "%c");
243 time_t t = luaL_opt(L, l_checktime, 2, time(NULL));
244 struct tm tmr, *stm;
245 if (*s == '!') { /* UTC? */
246 stm = l_gmtime(&t, &tmr);
247 s++; /* skip '!' */
248 }
249 else
250 stm = l_localtime(&t, &tmr);
251 if (stm == NULL) /* invalid date? */
252 lua_pushnil(L);
253 else if (strcmp(s, "*t") == 0) {
254 lua_createtable(L, 0, 9); /* 9 = number of fields */
255 setfield(L, "sec", stm->tm_sec);
256 setfield(L, "min", stm->tm_min);
257 setfield(L, "hour", stm->tm_hour);
258 setfield(L, "day", stm->tm_mday);
259 setfield(L, "month", stm->tm_mon+1);
260 setfield(L, "year", stm->tm_year+1900);
261 setfield(L, "wday", stm->tm_wday+1);
262 setfield(L, "yday", stm->tm_yday+1);
263 setboolfield(L, "isdst", stm->tm_isdst);
264 }
265 else {
266 char cc[4];
267 luaL_Buffer b;
268 cc[0] = '%';
269 luaL_buffinit(L, &b);
270 while (*s) {
271 if (*s != '%') /* no conversion specifier? */
272 luaL_addchar(&b, *s++);
273 else {
274 size_t reslen;
275 char buff[200]; /* should be big enough for any conversion result */
276 s = checkoption(L, s + 1, cc);
277 reslen = strftime(buff, sizeof(buff), cc, stm);
278 luaL_addlstring(&b, buff, reslen);
279 }
280 }
281 luaL_pushresult(&b);
282 }
283 return 1;
284 }
285
286
os_time(lua_State * L)287 static int os_time (lua_State *L) {
288 time_t t;
289 if (lua_isnoneornil(L, 1)) /* called without args? */
290 t = time(NULL); /* get current time */
291 else {
292 struct tm ts;
293 luaL_checktype(L, 1, LUA_TTABLE);
294 lua_settop(L, 1); /* make sure table is at the top */
295 ts.tm_sec = getfield(L, "sec", 0);
296 ts.tm_min = getfield(L, "min", 0);
297 ts.tm_hour = getfield(L, "hour", 12);
298 ts.tm_mday = getfield(L, "day", -1);
299 ts.tm_mon = getfield(L, "month", -1) - 1;
300 ts.tm_year = getfield(L, "year", -1) - 1900;
301 ts.tm_isdst = getboolfield(L, "isdst");
302 t = mktime(&ts);
303 }
304 if (t != (time_t)(l_timet)t)
305 luaL_error(L, "time result cannot be represented in this Lua installation");
306 else if (t == (time_t)(-1))
307 lua_pushnil(L);
308 else
309 l_pushtime(L, t);
310 return 1;
311 }
312
313
os_difftime(lua_State * L)314 static int os_difftime (lua_State *L) {
315 time_t t1 = l_checktime(L, 1);
316 time_t t2 = l_checktime(L, 2);
317 lua_pushnumber(L, (lua_Number)difftime(t1, t2));
318 return 1;
319 }
320
321 /* }====================================================== */
322
323
os_setlocale(lua_State * L)324 static int os_setlocale (lua_State *L) {
325 static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
326 LC_NUMERIC, LC_TIME};
327 static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
328 "numeric", "time", NULL};
329 const char *l = luaL_optstring(L, 1, NULL);
330 int op = luaL_checkoption(L, 2, "all", catnames);
331 lua_pushstring(L, setlocale(cat[op], l));
332 return 1;
333 }
334
335
os_exit(lua_State * L)336 static int os_exit (lua_State *L) {
337 int status;
338 if (lua_isboolean(L, 1))
339 status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
340 else
341 status = (int)luaL_optinteger(L, 1, EXIT_SUCCESS);
342 if (lua_toboolean(L, 2))
343 lua_close(L);
344 if (L) exit(status); /* 'if' to avoid warnings for unreachable 'return' */
345 return 0;
346 }
347
348
349 static const luaL_Reg syslib[] = {
350 {"clock", os_clock},
351 {"date", os_date},
352 {"difftime", os_difftime},
353 {"execute", os_execute},
354 {"exit", os_exit},
355 {"getenv", os_getenv},
356 {"remove", os_remove},
357 {"rename", os_rename},
358 {"setlocale", os_setlocale},
359 {"time", os_time},
360 {"tmpname", os_tmpname},
361 {NULL, NULL}
362 };
363
364 /* }====================================================== */
365
366
367
luaopen_os(lua_State * L)368 LUAMOD_API int luaopen_os (lua_State *L) {
369 luaL_newlib(L, syslib);
370 return 1;
371 }
372
373