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New function 'luaL_addgsub'

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Added a new function 'luaL_addgsub', similar to 'luaL_gsub' but that
adds its result directly to a preexisting buffer, avoiding the creation
of one extra intermediate string. Also added two simple macros,
'luaL_bufflen' and 'luaL_buffaddr', to query the current length
and the contents address of a buffer.
This commit is contained in:
Roberto Ierusalimschy 2019-04-24 14:41:41 -03:00
parent 3da34a5fa7
commit c65605151c
3 changed files with 58 additions and 13 deletions
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16
lauxlib.h
View file

@ -19,6 +19,8 @@
#define LUA_GNAME "_G"
typedef struct luaL_Buffer luaL_Buffer;
/* extra error code for 'luaL_loadfilex' */
#define LUA_ERRFILE (LUA_ERRERR+1)
@ -99,8 +101,10 @@ LUALIB_API lua_State *(luaL_newstate) (void);
LUALIB_API lua_Integer (luaL_len) (lua_State *L, int idx);
LUALIB_API const char *(luaL_gsub) (lua_State *L, const char *s, const char *p,
const char *r);
LUALIB_API void luaL_addgsub (luaL_Buffer *b, const char *s,
const char *p, const char *r);
LUALIB_API const char *(luaL_gsub) (lua_State *L, const char *s,
const char *p, const char *r);
LUALIB_API void (luaL_setfuncs) (lua_State *L, const luaL_Reg *l, int nup);
@ -155,7 +159,7 @@ LUALIB_API void (luaL_requiref) (lua_State *L, const char *modname,
** =======================================================
*/
typedef struct luaL_Buffer {
struct luaL_Buffer {
char *b; /* buffer address */
size_t size; /* buffer size */
size_t n; /* number of characters in buffer */
@ -164,7 +168,11 @@ typedef struct luaL_Buffer {
LUAI_MAXALIGN; /* ensure maximum alignment for buffer */
char b[LUAL_BUFFERSIZE]; /* initial buffer */
} init;
} luaL_Buffer;
};
#define luaL_bufflen(bf) ((bf)->n)
#define luaL_buffaddr(bf) ((bf)->b)
#define luaL_addchar(B,c) \