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