1 /*
2 ** $Id: loslib.c,v 1.40.1.1 2013/04/12 18:48:47 roberto Exp $
3 ** Standard Operating System library
4 ** See Copyright Notice in lua.h
5 */
6
7
8 #include <errno.h>
9 #include <locale.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <time.h>
13
14 #define loslib_c
15 #define LUA_LIB
16
17 #include "lua.h"
18
19 #include "lauxlib.h"
20 #include "lualib.h"
21
22
23 /*
24 ** list of valid conversion specifiers for the 'strftime' function
25 */
26 #if !defined(LUA_STRFTIMEOPTIONS)
27
28 #if !defined(LUA_USE_POSIX)
29 #define LUA_STRFTIMEOPTIONS { "aAbBcdHIjmMpSUwWxXyYz%", "" }
30 #else
31 #define LUA_STRFTIMEOPTIONS \
32 { "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%", "" \
33 "", "E", "cCxXyY", \
34 "O", "deHImMSuUVwWy" }
35 #endif
36
37 #endif
38
39
40
41 /*
42 ** By default, Lua uses tmpnam except when POSIX is available, where it
43 ** uses mkstemp.
44 */
45 #if defined(LUA_USE_MKSTEMP)
46 #include <unistd.h>
47 #define LUA_TMPNAMBUFSIZE 32
48 #define lua_tmpnam(b,e) { \
49 strcpy(b, "/tmp/lua_XXXXXX"); \
50 e = mkstemp(b); \
51 if (e != -1) close(e); \
52 e = (e == -1); }
53
54 #elif !defined(lua_tmpnam)
55
56 #define LUA_TMPNAMBUFSIZE L_tmpnam
57 #define lua_tmpnam(b,e) { e = (tmpnam(b) == NULL); }
58
59 #endif
60
61
62 /*
63 ** By default, Lua uses gmtime/localtime, except when POSIX is available,
64 ** where it uses gmtime_r/localtime_r
65 */
66 #if defined(LUA_USE_GMTIME_R)
67
68 #define l_gmtime(t,r) gmtime_r(t,r)
69 #define l_localtime(t,r) localtime_r(t,r)
70
71 #elif !defined(l_gmtime)
72
73 #define l_gmtime(t,r) ((void)r, gmtime(t))
74 #define l_localtime(t,r) ((void)r, localtime(t))
75
76 #endif
77
78
79
os_execute(lua_State * L)80 static int os_execute (lua_State *L) {
81 const char *cmd = luaL_optstring(L, 1, NULL);
82 int stat = system(cmd);
83 if (cmd != NULL)
84 return luaL_execresult(L, stat);
85 else {
86 lua_pushboolean(L, stat); /* true if there is a shell */
87 return 1;
88 }
89 }
90
91
os_remove(lua_State * L)92 static int os_remove (lua_State *L) {
93 const char *filename = luaL_checkstring(L, 1);
94 return luaL_fileresult(L, remove(filename) == 0, filename);
95 }
96
97
os_rename(lua_State * L)98 static int os_rename (lua_State *L) {
99 const char *fromname = luaL_checkstring(L, 1);
100 const char *toname = luaL_checkstring(L, 2);
101 return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
102 }
103
104
os_tmpname(lua_State * L)105 static int os_tmpname (lua_State *L) {
106 char buff[LUA_TMPNAMBUFSIZE];
107 int err;
108 lua_tmpnam(buff, err);
109 if (err)
110 return luaL_error(L, "unable to generate a unique filename");
111 lua_pushstring(L, buff);
112 return 1;
113 }
114
115
os_getenv(lua_State * L)116 static int os_getenv (lua_State *L) {
117 lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */
118 return 1;
119 }
120
121
os_clock(lua_State * L)122 static int os_clock (lua_State *L) {
123 lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
124 return 1;
125 }
126
127
128 /*
129 ** {======================================================
130 ** Time/Date operations
131 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
132 ** wday=%w+1, yday=%j, isdst=? }
133 ** =======================================================
134 */
135
setfield(lua_State * L,const char * key,int value)136 static void setfield (lua_State *L, const char *key, int value) {
137 lua_pushinteger(L, value);
138 lua_setfield(L, -2, key);
139 }
140
setboolfield(lua_State * L,const char * key,int value)141 static void setboolfield (lua_State *L, const char *key, int value) {
142 if (value < 0) /* undefined? */
143 return; /* does not set field */
144 lua_pushboolean(L, value);
145 lua_setfield(L, -2, key);
146 }
147
getboolfield(lua_State * L,const char * key)148 static int getboolfield (lua_State *L, const char *key) {
149 int res;
150 lua_getfield(L, -1, key);
151 res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
152 lua_pop(L, 1);
153 return res;
154 }
155
156
getfield(lua_State * L,const char * key,int d)157 static int getfield (lua_State *L, const char *key, int d) {
158 int res, isnum;
159 lua_getfield(L, -1, key);
160 res = (int)lua_tointegerx(L, -1, &isnum);
161 if (!isnum) {
162 if (d < 0)
163 return luaL_error(L, "field " LUA_QS " missing in date table", key);
164 res = d;
165 }
166 lua_pop(L, 1);
167 return res;
168 }
169
170
checkoption(lua_State * L,const char * conv,char * buff)171 static const char *checkoption (lua_State *L, const char *conv, char *buff) {
172 static const char *const options[] = LUA_STRFTIMEOPTIONS;
173 unsigned int i;
174 for (i = 0; i < sizeof(options)/sizeof(options[0]); i += 2) {
175 if (*conv != '\0' && strchr(options[i], *conv) != NULL) {
176 buff[1] = *conv;
177 if (*options[i + 1] == '\0') { /* one-char conversion specifier? */
178 buff[2] = '\0'; /* end buffer */
179 return conv + 1;
180 }
181 else if (*(conv + 1) != '\0' &&
182 strchr(options[i + 1], *(conv + 1)) != NULL) {
183 buff[2] = *(conv + 1); /* valid two-char conversion specifier */
184 buff[3] = '\0'; /* end buffer */
185 return conv + 2;
186 }
187 }
188 }
189 luaL_argerror(L, 1,
190 lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
191 return conv; /* to avoid warnings */
192 }
193
194
os_date(lua_State * L)195 static int os_date (lua_State *L) {
196 const char *s = luaL_optstring(L, 1, "%c");
197 time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
198 struct tm tmr, *stm;
199 if (*s == '!') { /* UTC? */
200 stm = l_gmtime(&t, &tmr);
201 s++; /* skip `!' */
202 }
203 else
204 stm = l_localtime(&t, &tmr);
205 if (stm == NULL) /* invalid date? */
206 lua_pushnil(L);
207 else if (strcmp(s, "*t") == 0) {
208 lua_createtable(L, 0, 9); /* 9 = number of fields */
209 setfield(L, "sec", stm->tm_sec);
210 setfield(L, "min", stm->tm_min);
211 setfield(L, "hour", stm->tm_hour);
212 setfield(L, "day", stm->tm_mday);
213 setfield(L, "month", stm->tm_mon+1);
214 setfield(L, "year", stm->tm_year+1900);
215 setfield(L, "wday", stm->tm_wday+1);
216 setfield(L, "yday", stm->tm_yday+1);
217 setboolfield(L, "isdst", stm->tm_isdst);
218 }
219 else {
220 char cc[4];
221 luaL_Buffer b;
222 cc[0] = '%';
223 luaL_buffinit(L, &b);
224 while (*s) {
225 if (*s != '%') /* no conversion specifier? */
226 luaL_addchar(&b, *s++);
227 else {
228 size_t reslen;
229 char buff[200]; /* should be big enough for any conversion result */
230 s = checkoption(L, s + 1, cc);
231 reslen = strftime(buff, sizeof(buff), cc, stm);
232 luaL_addlstring(&b, buff, reslen);
233 }
234 }
235 luaL_pushresult(&b);
236 }
237 return 1;
238 }
239
240
os_time(lua_State * L)241 static int os_time (lua_State *L) {
242 time_t t;
243 if (lua_isnoneornil(L, 1)) /* called without args? */
244 t = time(NULL); /* get current time */
245 else {
246 struct tm ts;
247 luaL_checktype(L, 1, LUA_TTABLE);
248 lua_settop(L, 1); /* make sure table is at the top */
249 ts.tm_sec = getfield(L, "sec", 0);
250 ts.tm_min = getfield(L, "min", 0);
251 ts.tm_hour = getfield(L, "hour", 12);
252 ts.tm_mday = getfield(L, "day", -1);
253 ts.tm_mon = getfield(L, "month", -1) - 1;
254 ts.tm_year = getfield(L, "year", -1) - 1900;
255 ts.tm_isdst = getboolfield(L, "isdst");
256 t = mktime(&ts);
257 }
258 if (t == (time_t)(-1))
259 lua_pushnil(L);
260 else
261 lua_pushnumber(L, (lua_Number)t);
262 return 1;
263 }
264
265
os_difftime(lua_State * L)266 static int os_difftime (lua_State *L) {
267 lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
268 (time_t)(luaL_optnumber(L, 2, 0))));
269 return 1;
270 }
271
272 /* }====================================================== */
273
274
os_setlocale(lua_State * L)275 static int os_setlocale (lua_State *L) {
276 static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
277 LC_NUMERIC, LC_TIME};
278 static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
279 "numeric", "time", NULL};
280 const char *l = luaL_optstring(L, 1, NULL);
281 int op = luaL_checkoption(L, 2, "all", catnames);
282 lua_pushstring(L, setlocale(cat[op], l));
283 return 1;
284 }
285
286
os_exit(lua_State * L)287 static int os_exit (lua_State *L) {
288 int status;
289 if (lua_isboolean(L, 1))
290 status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
291 else
292 status = luaL_optint(L, 1, EXIT_SUCCESS);
293 if (lua_toboolean(L, 2))
294 lua_close(L);
295 if (L) exit(status); /* 'if' to avoid warnings for unreachable 'return' */
296 return 0;
297 }
298
299
300 static const luaL_Reg syslib[] = {
301 {"clock", os_clock},
302 {"date", os_date},
303 {"difftime", os_difftime},
304 {"execute", os_execute},
305 {"exit", os_exit},
306 {"getenv", os_getenv},
307 {"remove", os_remove},
308 {"rename", os_rename},
309 {"setlocale", os_setlocale},
310 {"time", os_time},
311 {"tmpname", os_tmpname},
312 {NULL, NULL}
313 };
314
315 /* }====================================================== */
316
317
318
luaopen_os(lua_State * L)319 LUAMOD_API int luaopen_os (lua_State *L) {
320 luaL_newlib(L, syslib);
321 return 1;
322 }
323
324