ba8b5c17 |
1 | /* |
2 | ** $Id: loslib.c,v 1.40 2012/10/19 15:54:02 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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
319 | LUAMOD_API int luaopen_os (lua_State *L) { |
320 | luaL_newlib(L, syslib); |
321 | return 1; |
322 | } |
323 | |