root/src/lua-5.1.3/src/loslib.c

Revision 5c8778c4361d2ad3adc94ef98d804c6fa9e6ba7c, 5.9 kB (checked in by Theo Schlossnagle <jesus@omniti.com>, 10 years ago)

import lua... I'd like to write checkers in lua

  • Property mode set to 100644
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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
23 static int os_pushresult (lua_State *L, int i, const char *filename) {
24   int en = errno;  /* calls to Lua API may change this value */
25   if (i) {
26     lua_pushboolean(L, 1);
27     return 1;
28   }
29   else {
30     lua_pushnil(L);
31     lua_pushfstring(L, "%s: %s", filename, strerror(en));
32     lua_pushinteger(L, en);
33     return 3;
34   }
35 }
36
37
38 static int os_execute (lua_State *L) {
39   lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));
40   return 1;
41 }
42
43
44 static int os_remove (lua_State *L) {
45   const char *filename = luaL_checkstring(L, 1);
46   return os_pushresult(L, remove(filename) == 0, filename);
47 }
48
49
50 static int os_rename (lua_State *L) {
51   const char *fromname = luaL_checkstring(L, 1);
52   const char *toname = luaL_checkstring(L, 2);
53   return os_pushresult(L, rename(fromname, toname) == 0, fromname);
54 }
55
56
57 static int os_tmpname (lua_State *L) {
58   char buff[LUA_TMPNAMBUFSIZE];
59   int err;
60   lua_tmpnam(buff, err);
61   if (err)
62     return luaL_error(L, "unable to generate a unique filename");
63   lua_pushstring(L, buff);
64   return 1;
65 }
66
67
68 static int os_getenv (lua_State *L) {
69   lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
70   return 1;
71 }
72
73
74 static int os_clock (lua_State *L) {
75   lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
76   return 1;
77 }
78
79
80 /*
81 ** {======================================================
82 ** Time/Date operations
83 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
84 **   wday=%w+1, yday=%j, isdst=? }
85 ** =======================================================
86 */
87
88 static void setfield (lua_State *L, const char *key, int value) {
89   lua_pushinteger(L, value);
90   lua_setfield(L, -2, key);
91 }
92
93 static void setboolfield (lua_State *L, const char *key, int value) {
94   if (value < 0)  /* undefined? */
95     return;  /* does not set field */
96   lua_pushboolean(L, value);
97   lua_setfield(L, -2, key);
98 }
99
100 static int getboolfield (lua_State *L, const char *key) {
101   int res;
102   lua_getfield(L, -1, key);
103   res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
104   lua_pop(L, 1);
105   return res;
106 }
107
108
109 static int getfield (lua_State *L, const char *key, int d) {
110   int res;
111   lua_getfield(L, -1, key);
112   if (lua_isnumber(L, -1))
113     res = (int)lua_tointeger(L, -1);
114   else {
115     if (d < 0)
116       return luaL_error(L, "field " LUA_QS " missing in date table", key);
117     res = d;
118   }
119   lua_pop(L, 1);
120   return res;
121 }
122
123
124 static int os_date (lua_State *L) {
125   const char *s = luaL_optstring(L, 1, "%c");
126   time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
127   struct tm *stm;
128   if (*s == '!') {  /* UTC? */
129     stm = gmtime(&t);
130     s++;  /* skip `!' */
131   }
132   else
133     stm = localtime(&t);
134   if (stm == NULL)  /* invalid date? */
135     lua_pushnil(L);
136   else if (strcmp(s, "*t") == 0) {
137     lua_createtable(L, 0, 9);  /* 9 = number of fields */
138     setfield(L, "sec", stm->tm_sec);
139     setfield(L, "min", stm->tm_min);
140     setfield(L, "hour", stm->tm_hour);
141     setfield(L, "day", stm->tm_mday);
142     setfield(L, "month", stm->tm_mon+1);
143     setfield(L, "year", stm->tm_year+1900);
144     setfield(L, "wday", stm->tm_wday+1);
145     setfield(L, "yday", stm->tm_yday+1);
146     setboolfield(L, "isdst", stm->tm_isdst);
147   }
148   else {
149     char cc[3];
150     luaL_Buffer b;
151     cc[0] = '%'; cc[2] = '\0';
152     luaL_buffinit(L, &b);
153     for (; *s; s++) {
154       if (*s != '%' || *(s + 1) == '\0')  /* no conversion specifier? */
155         luaL_addchar(&b, *s);
156       else {
157         size_t reslen;
158         char buff[200];  /* should be big enough for any conversion result */
159         cc[1] = *(++s);
160         reslen = strftime(buff, sizeof(buff), cc, stm);
161         luaL_addlstring(&b, buff, reslen);
162       }
163     }
164     luaL_pushresult(&b);
165   }
166   return 1;
167 }
168
169
170 static int os_time (lua_State *L) {
171   time_t t;
172   if (lua_isnoneornil(L, 1))  /* called without args? */
173     t = time(NULL);  /* get current time */
174   else {
175     struct tm ts;
176     luaL_checktype(L, 1, LUA_TTABLE);
177     lua_settop(L, 1);  /* make sure table is at the top */
178     ts.tm_sec = getfield(L, "sec", 0);
179     ts.tm_min = getfield(L, "min", 0);
180     ts.tm_hour = getfield(L, "hour", 12);
181     ts.tm_mday = getfield(L, "day", -1);
182     ts.tm_mon = getfield(L, "month", -1) - 1;
183     ts.tm_year = getfield(L, "year", -1) - 1900;
184     ts.tm_isdst = getboolfield(L, "isdst");
185     t = mktime(&ts);
186   }
187   if (t == (time_t)(-1))
188     lua_pushnil(L);
189   else
190     lua_pushnumber(L, (lua_Number)t);
191   return 1;
192 }
193
194
195 static int os_difftime (lua_State *L) {
196   lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
197                              (time_t)(luaL_optnumber(L, 2, 0))));
198   return 1;
199 }
200
201 /* }====================================================== */
202
203
204 static int os_setlocale (lua_State *L) {
205   static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
206                       LC_NUMERIC, LC_TIME};
207   static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
208      "numeric", "time", NULL};
209   const char *l = luaL_optstring(L, 1, NULL);
210   int op = luaL_checkoption(L, 2, "all", catnames);
211   lua_pushstring(L, setlocale(cat[op], l));
212   return 1;
213 }
214
215
216 static int os_exit (lua_State *L) {
217   exit(luaL_optint(L, 1, EXIT_SUCCESS));
218 }
219
220 static const luaL_Reg syslib[] = {
221   {"clock",     os_clock},
222   {"date",      os_date},
223   {"difftime",  os_difftime},
224   {"execute",   os_execute},
225   {"exit",      os_exit},
226   {"getenv",    os_getenv},
227   {"remove",    os_remove},
228   {"rename",    os_rename},
229   {"setlocale", os_setlocale},
230   {"time",      os_time},
231   {"tmpname",   os_tmpname},
232   {NULL, NULL}
233 };
234
235 /* }====================================================== */
236
237
238
239 LUALIB_API int luaopen_os (lua_State *L) {
240   luaL_register(L, LUA_OSLIBNAME, syslib);
241   return 1;
242 }
243
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