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1/*
2** $Id: loslib.c,v 1.19 2006/04/26 18:19:49 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
23static 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
38static int os_execute (lua_State *L) {
39 lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));
40 return 1;
41}
42
43
44static 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
50static 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
57static 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
68static 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
74static 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
88static void setfield (lua_State *L, const char *key, int value) {
89 lua_pushinteger(L, value);
90 lua_setfield(L, -2, key);
91}
92
93static 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
100static 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
109static 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
124static 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
170static 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
195static 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
204static 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
216static int os_exit (lua_State *L) {
217 exit(luaL_optint(L, 1, EXIT_SUCCESS));
218 return 0; /* to avoid warnings */
219}
220
221static const luaL_Reg syslib[] = {
222 {"clock", os_clock},
223 {"date", os_date},
224 {"difftime", os_difftime},
225 {"execute", os_execute},
226 {"exit", os_exit},
227 {"getenv", os_getenv},
228 {"remove", os_remove},
229 {"rename", os_rename},
230 {"setlocale", os_setlocale},
231 {"time", os_time},
232 {"tmpname", os_tmpname},
233 {NULL, NULL}
234};
235
236/* }====================================================== */
237
238
239
240LUALIB_API int luaopen_os (lua_State *L) {
241 luaL_register(L, LUA_OSLIBNAME, syslib);
242 return 1;
243}
244

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