1 /*
2 ** $Id: loslib.c,v 1.19.1.3 2008/01/18 16:38:18 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 #if ((defined __MACH__) && (defined __APPLE__))
23 #include <TargetConditionals.h>
24 #if TARGET_OS_IPHONE
25 #define LUA_PLATFORM_IOS 1
26 #endif
27 #endif
28
29 #ifdef LUA_PLATFORM_IOS
30 #include <spawn.h>
31 extern char **environ;
32 #endif
33
os_pushresult(lua_State * L,int i,const char * filename)34 static int os_pushresult (lua_State *L, int i, const char *filename) {
35 int en = errno; /* calls to Lua API may change this value */
36 if (i) {
37 lua_pushboolean(L, 1);
38 return 1;
39 }
40 else {
41 lua_pushnil(L);
42 lua_pushfstring(L, "%s: %s", filename, strerror(en));
43 lua_pushinteger(L, en);
44 return 3;
45 }
46 }
47
48
os_execute(lua_State * L)49 static int os_execute (lua_State *L) {
50 const char *command = luaL_optstring(L, 1, NULL);
51 int status;
52 #ifndef LUA_PLATFORM_IOS
53 status = system(command);
54 #else
55 // untested, may require adjustments depending on `command`
56 pid_t pid;
57 char *argv[] = { (char *)command, NULL };
58 posix_spawn(&pid, argv[0], NULL, NULL, argv, environ);
59 waitpid(pid, &status, 0);
60 #endif
61 lua_pushinteger(L, status);
62 return 1;
63 }
64
65
os_remove(lua_State * L)66 static int os_remove (lua_State *L) {
67 const char *filename = luaL_checkstring(L, 1);
68 return os_pushresult(L, remove(filename) == 0, filename);
69 }
70
71
os_rename(lua_State * L)72 static int os_rename (lua_State *L) {
73 const char *fromname = luaL_checkstring(L, 1);
74 const char *toname = luaL_checkstring(L, 2);
75 return os_pushresult(L, rename(fromname, toname) == 0, fromname);
76 }
77
78
os_tmpname(lua_State * L)79 static int os_tmpname (lua_State *L) {
80 char buff[LUA_TMPNAMBUFSIZE];
81 int err;
82 lua_tmpnam(buff, err);
83 if (err)
84 return luaL_error(L, "unable to generate a unique filename");
85 lua_pushstring(L, buff);
86 return 1;
87 }
88
89
os_getenv(lua_State * L)90 static int os_getenv (lua_State *L) {
91 lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */
92 return 1;
93 }
94
95
os_clock(lua_State * L)96 static int os_clock (lua_State *L) {
97 lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
98 return 1;
99 }
100
101
102 /*
103 ** {======================================================
104 ** Time/Date operations
105 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
106 ** wday=%w+1, yday=%j, isdst=? }
107 ** =======================================================
108 */
109
setfield(lua_State * L,const char * key,int value)110 static void setfield (lua_State *L, const char *key, int value) {
111 lua_pushinteger(L, value);
112 lua_setfield(L, -2, key);
113 }
114
setboolfield(lua_State * L,const char * key,int value)115 static void setboolfield (lua_State *L, const char *key, int value) {
116 if (value < 0) /* undefined? */
117 return; /* does not set field */
118 lua_pushboolean(L, value);
119 lua_setfield(L, -2, key);
120 }
121
getboolfield(lua_State * L,const char * key)122 static int getboolfield (lua_State *L, const char *key) {
123 int res;
124 lua_getfield(L, -1, key);
125 res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
126 lua_pop(L, 1);
127 return res;
128 }
129
130
getfield(lua_State * L,const char * key,int d)131 static int getfield (lua_State *L, const char *key, int d) {
132 int res;
133 lua_getfield(L, -1, key);
134 if (lua_isnumber(L, -1))
135 res = (int)lua_tointeger(L, -1);
136 else {
137 if (d < 0)
138 return luaL_error(L, "field " LUA_QS " missing in date table", key);
139 res = d;
140 }
141 lua_pop(L, 1);
142 return res;
143 }
144
145
os_date(lua_State * L)146 static int os_date (lua_State *L) {
147 const char *s = luaL_optstring(L, 1, "%c");
148 time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
149 struct tm *stm;
150 if (*s == '!') { /* UTC? */
151 stm = gmtime(&t);
152 s++; /* skip `!' */
153 }
154 else
155 stm = localtime(&t);
156 if (stm == NULL) /* invalid date? */
157 lua_pushnil(L);
158 else if (strcmp(s, "*t") == 0) {
159 lua_createtable(L, 0, 9); /* 9 = number of fields */
160 setfield(L, "sec", stm->tm_sec);
161 setfield(L, "min", stm->tm_min);
162 setfield(L, "hour", stm->tm_hour);
163 setfield(L, "day", stm->tm_mday);
164 setfield(L, "month", stm->tm_mon+1);
165 setfield(L, "year", stm->tm_year+1900);
166 setfield(L, "wday", stm->tm_wday+1);
167 setfield(L, "yday", stm->tm_yday+1);
168 setboolfield(L, "isdst", stm->tm_isdst);
169 }
170 else {
171 char cc[3];
172 luaL_Buffer b;
173 cc[0] = '%'; cc[2] = '\0';
174 luaL_buffinit(L, &b);
175 for (; *s; s++) {
176 if (*s != '%' || *(s + 1) == '\0') /* no conversion specifier? */
177 luaL_addchar(&b, *s);
178 else {
179 size_t reslen;
180 char buff[200]; /* should be big enough for any conversion result */
181 cc[1] = *(++s);
182 reslen = strftime(buff, sizeof(buff), cc, stm);
183 luaL_addlstring(&b, buff, reslen);
184 }
185 }
186 luaL_pushresult(&b);
187 }
188 return 1;
189 }
190
191
os_time(lua_State * L)192 static int os_time (lua_State *L) {
193 time_t t;
194 if (lua_isnoneornil(L, 1)) /* called without args? */
195 t = time(NULL); /* get current time */
196 else {
197 struct tm ts;
198 luaL_checktype(L, 1, LUA_TTABLE);
199 lua_settop(L, 1); /* make sure table is at the top */
200 ts.tm_sec = getfield(L, "sec", 0);
201 ts.tm_min = getfield(L, "min", 0);
202 ts.tm_hour = getfield(L, "hour", 12);
203 ts.tm_mday = getfield(L, "day", -1);
204 ts.tm_mon = getfield(L, "month", -1) - 1;
205 ts.tm_year = getfield(L, "year", -1) - 1900;
206 ts.tm_isdst = getboolfield(L, "isdst");
207 t = mktime(&ts);
208 }
209 if (t == (time_t)(-1))
210 lua_pushnil(L);
211 else
212 lua_pushnumber(L, (lua_Number)t);
213 return 1;
214 }
215
216
os_difftime(lua_State * L)217 static int os_difftime (lua_State *L) {
218 lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
219 (time_t)(luaL_optnumber(L, 2, 0))));
220 return 1;
221 }
222
223 /* }====================================================== */
224
225
os_setlocale(lua_State * L)226 static int os_setlocale (lua_State *L) {
227 static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
228 LC_NUMERIC, LC_TIME};
229 static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
230 "numeric", "time", NULL};
231 const char *l = luaL_optstring(L, 1, NULL);
232 int op = luaL_checkoption(L, 2, "all", catnames);
233 lua_pushstring(L, setlocale(cat[op], l));
234 return 1;
235 }
236
237
os_exit(lua_State * L)238 static int os_exit (lua_State *L) {
239 exit(luaL_optint(L, 1, EXIT_SUCCESS));
240 }
241
242 static const luaL_Reg syslib[] = {
243 {"clock", os_clock},
244 {"date", os_date},
245 {"difftime", os_difftime},
246 {"execute", os_execute},
247 {"exit", os_exit},
248 {"getenv", os_getenv},
249 {"remove", os_remove},
250 {"rename", os_rename},
251 {"setlocale", os_setlocale},
252 {"time", os_time},
253 {"tmpname", os_tmpname},
254 {NULL, NULL}
255 };
256
257 /* }====================================================== */
258
259
260
luaopen_os(lua_State * L)261 LUALIB_API int luaopen_os (lua_State *L) {
262 luaL_register(L, LUA_OSLIBNAME, syslib);
263 return 1;
264 }
265
266