Added exposed C functions to Lua embed

Author Mitja Felicijan <mitja.felicijan@gmail.com> 2025-07-17 17:13:45 +0200
Committer Mitja Felicijan <mitja.felicijan@gmail.com> 2025-07-17 17:13:45 +0200
Commit c83e5d2713334d39bf0718f626cab387f7331a98 (patch)
-rw-r--r-- c-embed-lua/hi.h 13
-rw-r--r-- c-embed-lua/hi.lua 7
-rw-r--r-- c-embed-lua/main.c 11
3 files changed, 29 insertions, 2 deletions
diff --git a/c-embed-lua/hi.h b/c-embed-lua/hi.h
...
169 
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170 
  0x28, 0x6c, 0x69, 0x6e, 0x65, 0x29, 0x0a, 0x65, 0x6e, 0x64, 0x0a, 0x0a,
 170 
  0x28, 0x6c, 0x69, 0x6e, 0x65, 0x29, 0x0a, 0x65, 0x6e, 0x64, 0x0a, 0x0a,
171 
  0x66, 0x69, 0x6c, 0x65, 0x3a, 0x63, 0x6c, 0x6f, 0x73, 0x65, 0x28, 0x29,
 171 
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172 
  0x0a
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  0x0a, 0x0a, 0x2d, 0x2d, 0x20, 0x45, 0x78, 0x70, 0x6f, 0x73, 0x69, 0x6e,
 
  
 173 
  0x67, 0x20, 0x43, 0x20, 0x66, 0x75, 0x6e, 0x63, 0x74, 0x69, 0x6f, 0x6e,
 
  
 174 
  0x73, 0x2e, 0x0a, 0x0a, 0x68, 0x65, 0x61, 0x64, 0x65, 0x72, 0x28, 0x22,
 
  
 175 
  0x45, 0x78, 0x70, 0x6f, 0x73, 0x69, 0x6e, 0x67, 0x20, 0x43, 0x20, 0x66,
 
  
 176 
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 177 
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  0x35, 0x29, 0x0a, 0x70, 0x72, 0x69, 0x6e, 0x74, 0x28, 0x22, 0x53, 0x75,
 
  
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 181 
  0x74, 0x29, 0x0a
173 
};
 182 
};
174 
unsigned int hi_len = 2041;
 183 
unsigned int hi_len = 2151;
diff --git a/c-embed-lua/hi.lua b/c-embed-lua/hi.lua
...
104 
end
 104 
end
105 
  
 105 
  
106 
file:close()
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file:close()
 
  
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-- Exposing C functions.
 
  
 109 
  
 
  
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header("Exposing C functions")
 
  
 111 
  
 
  
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local result = c_sum(3, 5)
 
  
 113 
print("Sum is", result)
diff --git a/c-embed-lua/main.c b/c-embed-lua/main.c
...
4 
  
 4 
  
5 
#include "hi.h"
 5 
#include "hi.h"
6 
  
 6 
  
 
  
 7 
static int l_sum(lua_State *L) {
 
  
 8 
	double a = luaL_checknumber(L, 1);
 
  
 9 
	double b = luaL_checknumber(L, 2);
 
  
 10 
	lua_pushnumber(L, a + b);
 
  
 11 
	return 1;
 
  
 12 
}
 
  
 13 
  
7 
int main(void) {
 14 
int main(void) {
8 
	lua_State *L = luaL_newstate();
 15 
	lua_State *L = luaL_newstate();
9 
	luaL_openlibs(L);
 16 
	luaL_openlibs(L);
 
  
 17 
  
 
  
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	// You do not need to prefix name of the function with `c_`. I did it to
 
  
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	// make it clear in the lua script code that this is a custom function.
 
  
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	lua_register(L, "c_sum", l_sum);
10 
  
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11 
	// Not wise since this is not a null-terminated string.
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	// Not wise since this is not a null-terminated string.
12 
	/* luaL_dostring(L, (const char*)hi); */
 23 
	/* luaL_dostring(L, (const char*)hi); */
...