diff options
Diffstat (limited to 'vendor/compat53/c-api/compat-5.3.c')
| -rw-r--r-- | vendor/compat53/c-api/compat-5.3.c | 888 |
1 files changed, 888 insertions, 0 deletions
diff --git a/vendor/compat53/c-api/compat-5.3.c b/vendor/compat53/c-api/compat-5.3.c new file mode 100644 index 0000000..bf81673 --- /dev/null +++ b/vendor/compat53/c-api/compat-5.3.c @@ -0,0 +1,888 @@ +#include <stddef.h> +#include <stdlib.h> +#include <string.h> +#include <ctype.h> +#include <errno.h> +#include <stdio.h> +#include "compat-5.3.h" + +/* don't compile it again if it already is included via compat53.h */ +#ifndef COMPAT53_C_ +#define COMPAT53_C_ + + + +/* definitions for Lua 5.1 only */ +#if defined(LUA_VERSION_NUM) && LUA_VERSION_NUM == 501 + +#ifndef COMPAT53_FOPEN_NO_LOCK +# if defined(_MSC_VER) +# define COMPAT53_FOPEN_NO_LOCK 1 +# else /* otherwise */ +# define COMPAT53_FOPEN_NO_LOCK 0 +# endif /* VC++ only so far */ +#endif /* No-lock fopen_s usage if possible */ + +#if defined(_MSC_VER) && COMPAT53_FOPEN_NO_LOCK +# include <share.h> +#endif /* VC++ _fsopen for share-allowed file read */ + +#ifndef COMPAT53_HAVE_STRERROR_R +# if defined(__GLIBC__) || defined(_POSIX_VERSION) || defined(__APPLE__) || \ + (!defined (__MINGW32__) && defined(__GNUC__) && (__GNUC__ < 6)) +# define COMPAT53_HAVE_STRERROR_R 1 +# else /* none of the defines matched: define to 0 */ +# define COMPAT53_HAVE_STRERROR_R 0 +# endif /* have strerror_r of some form */ +#endif /* strerror_r */ + +#ifndef COMPAT53_HAVE_STRERROR_S +# if defined(_MSC_VER) || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L && \ + defined(__STDC_LIB_EXT1__) && __STDC_LIB_EXT1__) +# define COMPAT53_HAVE_STRERROR_S 1 +# else /* not VC++ or C11 */ +# define COMPAT53_HAVE_STRERROR_S 0 +# endif /* strerror_s from VC++ or C11 */ +#endif /* strerror_s */ + +#ifndef COMPAT53_LUA_FILE_BUFFER_SIZE +# define COMPAT53_LUA_FILE_BUFFER_SIZE 4096 +#endif /* Lua File Buffer Size */ + + +static char* compat53_strerror (int en, char* buff, size_t sz) { +#if COMPAT53_HAVE_STRERROR_R + /* use strerror_r here, because it's available on these specific platforms */ + if (sz > 0) { + buff[0] = '\0'; + /* we don't care whether the GNU version or the XSI version is used: */ + if (strerror_r(en, buff, sz)) { + /* Yes, we really DO want to ignore the return value! + * GCC makes that extra hard, not even a (void) cast will do. */ + } + if (buff[0] == '\0') { + /* Buffer is unchanged, so we probably have called GNU strerror_r which + * returned a static constant string. Chances are that strerror will + * return the same static constant string and therefore be thread-safe. */ + return strerror(en); + } + } + return buff; /* sz is 0 *or* strerror_r wrote into the buffer */ +#elif COMPAT53_HAVE_STRERROR_S + /* for MSVC and other C11 implementations, use strerror_s since it's + * provided by default by the libraries */ + strerror_s(buff, sz, en); + return buff; +#else + /* fallback, but strerror is not guaranteed to be threadsafe due to modifying + * errno itself and some impls not locking a static buffer for it ... but most + * known systems have threadsafe errno: this might only change if the locale + * is changed out from under someone while this function is being called */ + (void)buff; + (void)sz; + return strerror(en); +#endif +} + + +COMPAT53_API int lua_absindex (lua_State *L, int i) { + if (i < 0 && i > LUA_REGISTRYINDEX) + i += lua_gettop(L) + 1; + return i; +} + + +static void compat53_call_lua (lua_State *L, char const code[], size_t len, + int nargs, int nret) { + lua_rawgetp(L, LUA_REGISTRYINDEX, (void*)code); + if (lua_type(L, -1) != LUA_TFUNCTION) { + lua_pop(L, 1); + if (luaL_loadbuffer(L, code, len, "=none")) + lua_error(L); + lua_pushvalue(L, -1); + lua_rawsetp(L, LUA_REGISTRYINDEX, (void*)code); + } + lua_insert(L, -nargs-1); + lua_call(L, nargs, nret); +} + + +static const char compat53_arith_code[] = + "local op,a,b=...\n" + "if op==0 then return a+b\n" + "elseif op==1 then return a-b\n" + "elseif op==2 then return a*b\n" + "elseif op==3 then return a/b\n" + "elseif op==4 then return a%b\n" + "elseif op==5 then return a^b\n" + "elseif op==6 then return -a\n" + "end\n"; + +COMPAT53_API void lua_arith (lua_State *L, int op) { + if (op < LUA_OPADD || op > LUA_OPUNM) + luaL_error(L, "invalid 'op' argument for lua_arith"); + luaL_checkstack(L, 5, "not enough stack slots"); + if (op == LUA_OPUNM) + lua_pushvalue(L, -1); + lua_pushnumber(L, op); + lua_insert(L, -3); + compat53_call_lua(L, compat53_arith_code, + sizeof(compat53_arith_code)-1, 3, 1); +} + + +static const char compat53_compare_code[] = + "local a,b=...\n" + "return a<=b\n"; + +COMPAT53_API int lua_compare (lua_State *L, int idx1, int idx2, int op) { + int result = 0; + switch (op) { + case LUA_OPEQ: + return lua_equal(L, idx1, idx2); + case LUA_OPLT: + return lua_lessthan(L, idx1, idx2); + case LUA_OPLE: + luaL_checkstack(L, 5, "not enough stack slots"); + idx1 = lua_absindex(L, idx1); + idx2 = lua_absindex(L, idx2); + lua_pushvalue(L, idx1); + lua_pushvalue(L, idx2); + compat53_call_lua(L, compat53_compare_code, + sizeof(compat53_compare_code)-1, 2, 1); + result = lua_toboolean(L, -1); + lua_pop(L, 1); + return result; + default: + luaL_error(L, "invalid 'op' argument for lua_compare"); + } + return 0; +} + + +COMPAT53_API void lua_copy (lua_State *L, int from, int to) { + int abs_to = lua_absindex(L, to); + luaL_checkstack(L, 1, "not enough stack slots"); + lua_pushvalue(L, from); + lua_replace(L, abs_to); +} + + +COMPAT53_API void lua_len (lua_State *L, int i) { + switch (lua_type(L, i)) { + case LUA_TSTRING: + lua_pushnumber(L, (lua_Number)lua_objlen(L, i)); + break; + case LUA_TTABLE: + if (!luaL_callmeta(L, i, "__len")) + lua_pushnumber(L, (lua_Number)lua_objlen(L, i)); + break; + case LUA_TUSERDATA: + if (luaL_callmeta(L, i, "__len")) + break; + /* FALLTHROUGH */ + default: + luaL_error(L, "attempt to get length of a %s value", + lua_typename(L, lua_type(L, i))); + } +} + + +COMPAT53_API int lua_rawgetp (lua_State *L, int i, const void *p) { + int abs_i = lua_absindex(L, i); + lua_pushlightuserdata(L, (void*)p); + lua_rawget(L, abs_i); + return lua_type(L, -1); +} + +COMPAT53_API void lua_rawsetp (lua_State *L, int i, const void *p) { + int abs_i = lua_absindex(L, i); + luaL_checkstack(L, 1, "not enough stack slots"); + lua_pushlightuserdata(L, (void*)p); + lua_insert(L, -2); + lua_rawset(L, abs_i); +} + + +COMPAT53_API lua_Number lua_tonumberx (lua_State *L, int i, int *isnum) { + lua_Number n = lua_tonumber(L, i); + if (isnum != NULL) { + *isnum = (n != 0 || lua_isnumber(L, i)); + } + return n; +} + + +COMPAT53_API void luaL_checkversion (lua_State *L) { + (void)L; +} + + +COMPAT53_API void luaL_checkstack (lua_State *L, int sp, const char *msg) { + if (!lua_checkstack(L, sp+LUA_MINSTACK)) { + if (msg != NULL) + luaL_error(L, "stack overflow (%s)", msg); + else { + lua_pushliteral(L, "stack overflow"); + lua_error(L); + } + } +} + + +COMPAT53_API int luaL_getsubtable (lua_State *L, int i, const char *name) { + int abs_i = lua_absindex(L, i); + luaL_checkstack(L, 3, "not enough stack slots"); + lua_pushstring(L, name); + lua_gettable(L, abs_i); + if (lua_istable(L, -1)) + return 1; + lua_pop(L, 1); + lua_newtable(L); + lua_pushstring(L, name); + lua_pushvalue(L, -2); + lua_settable(L, abs_i); + return 0; +} + + +COMPAT53_API lua_Integer luaL_len (lua_State *L, int i) { + lua_Integer res = 0; + int isnum = 0; + luaL_checkstack(L, 1, "not enough stack slots"); + lua_len(L, i); + res = lua_tointegerx(L, -1, &isnum); + lua_pop(L, 1); + if (!isnum) + luaL_error(L, "object length is not an integer"); + return res; +} + + +COMPAT53_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) { + luaL_checkstack(L, nup+1, "too many upvalues"); + for (; l->name != NULL; l++) { /* fill the table with given functions */ + int i; + lua_pushstring(L, l->name); + for (i = 0; i < nup; i++) /* copy upvalues to the top */ + lua_pushvalue(L, -(nup + 1)); + lua_pushcclosure(L, l->func, nup); /* closure with those upvalues */ + lua_settable(L, -(nup + 3)); /* table must be below the upvalues, the name and the closure */ + } + lua_pop(L, nup); /* remove upvalues */ +} + + +COMPAT53_API void luaL_setmetatable (lua_State *L, const char *tname) { + luaL_checkstack(L, 1, "not enough stack slots"); + luaL_getmetatable(L, tname); + lua_setmetatable(L, -2); +} + + +COMPAT53_API void *luaL_testudata (lua_State *L, int i, const char *tname) { + void *p = lua_touserdata(L, i); + luaL_checkstack(L, 2, "not enough stack slots"); + if (p == NULL || !lua_getmetatable(L, i)) + return NULL; + else { + int res = 0; + luaL_getmetatable(L, tname); + res = lua_rawequal(L, -1, -2); + lua_pop(L, 2); + if (!res) + p = NULL; + } + return p; +} + + +static int compat53_countlevels (lua_State *L) { + lua_Debug ar; + int li = 1, le = 1; + /* find an upper bound */ + while (lua_getstack(L, le, &ar)) { li = le; le *= 2; } + /* do a binary search */ + while (li < le) { + int m = (li + le)/2; + if (lua_getstack(L, m, &ar)) li = m + 1; + else le = m; + } + return le - 1; +} + +static int compat53_findfield (lua_State *L, int objidx, int level) { + if (level == 0 || !lua_istable(L, -1)) + return 0; /* not found */ + lua_pushnil(L); /* start 'next' loop */ + while (lua_next(L, -2)) { /* for each pair in table */ + if (lua_type(L, -2) == LUA_TSTRING) { /* ignore non-string keys */ + if (lua_rawequal(L, objidx, -1)) { /* found object? */ + lua_pop(L, 1); /* remove value (but keep name) */ + return 1; + } + else if (compat53_findfield(L, objidx, level - 1)) { /* try recursively */ + lua_remove(L, -2); /* remove table (but keep name) */ + lua_pushliteral(L, "."); + lua_insert(L, -2); /* place '.' between the two names */ + lua_concat(L, 3); + return 1; + } + } + lua_pop(L, 1); /* remove value */ + } + return 0; /* not found */ +} + +static int compat53_pushglobalfuncname (lua_State *L, lua_Debug *ar) { + int top = lua_gettop(L); + lua_getinfo(L, "f", ar); /* push function */ + lua_pushvalue(L, LUA_GLOBALSINDEX); + if (compat53_findfield(L, top + 1, 2)) { + lua_copy(L, -1, top + 1); /* move name to proper place */ + lua_pop(L, 2); /* remove pushed values */ + return 1; + } + else { + lua_settop(L, top); /* remove function and global table */ + return 0; + } +} + +static void compat53_pushfuncname (lua_State *L, lua_Debug *ar) { + if (*ar->namewhat != '\0') /* is there a name? */ + lua_pushfstring(L, "function " LUA_QS, ar->name); + else if (*ar->what == 'm') /* main? */ + lua_pushliteral(L, "main chunk"); + else if (*ar->what == 'C') { + if (compat53_pushglobalfuncname(L, ar)) { + lua_pushfstring(L, "function " LUA_QS, lua_tostring(L, -1)); + lua_remove(L, -2); /* remove name */ + } + else + lua_pushliteral(L, "?"); + } + else + lua_pushfstring(L, "function <%s:%d>", ar->short_src, ar->linedefined); +} + +#define COMPAT53_LEVELS1 12 /* size of the first part of the stack */ +#define COMPAT53_LEVELS2 10 /* size of the second part of the stack */ + +COMPAT53_API void luaL_traceback (lua_State *L, lua_State *L1, + const char *msg, int level) { + lua_Debug ar; + int top = lua_gettop(L); + int numlevels = compat53_countlevels(L1); + int mark = (numlevels > COMPAT53_LEVELS1 + COMPAT53_LEVELS2) ? COMPAT53_LEVELS1 : 0; + if (msg) lua_pushfstring(L, "%s\n", msg); + lua_pushliteral(L, "stack traceback:"); + while (lua_getstack(L1, level++, &ar)) { + if (level == mark) { /* too many levels? */ + lua_pushliteral(L, "\n\t..."); /* add a '...' */ + level = numlevels - COMPAT53_LEVELS2; /* and skip to last ones */ + } + else { + lua_getinfo(L1, "Slnt", &ar); + lua_pushfstring(L, "\n\t%s:", ar.short_src); + if (ar.currentline > 0) + lua_pushfstring(L, "%d:", ar.currentline); + lua_pushliteral(L, " in "); + compat53_pushfuncname(L, &ar); + lua_concat(L, lua_gettop(L) - top); + } + } + lua_concat(L, lua_gettop(L) - top); +} + + +COMPAT53_API int luaL_fileresult (lua_State *L, int stat, const char *fname) { + const char *serr = NULL; + int en = errno; /* calls to Lua API may change this value */ + char buf[512] = { 0 }; + if (stat) { + lua_pushboolean(L, 1); + return 1; + } + else { + lua_pushnil(L); + serr = compat53_strerror(en, buf, sizeof(buf)); + if (fname) + lua_pushfstring(L, "%s: %s", fname, serr); + else + lua_pushstring(L, serr); + lua_pushnumber(L, (lua_Number)en); + return 3; + } +} + + +static int compat53_checkmode (lua_State *L, const char *mode, const char *modename, int err) { + if (mode && strchr(mode, modename[0]) == NULL) { + lua_pushfstring(L, "attempt to load a %s chunk (mode is '%s')", modename, mode); + return err; + } + return LUA_OK; +} + + +typedef struct { + lua_Reader reader; + void *ud; + int has_peeked_data; + const char *peeked_data; + size_t peeked_data_size; +} compat53_reader_data; + + +static const char *compat53_reader (lua_State *L, void *ud, size_t *size) { + compat53_reader_data *data = (compat53_reader_data *)ud; + if (data->has_peeked_data) { + data->has_peeked_data = 0; + *size = data->peeked_data_size; + return data->peeked_data; + } else + return data->reader(L, data->ud, size); +} + + +COMPAT53_API int lua_load (lua_State *L, lua_Reader reader, void *data, const char *source, const char *mode) { + int status = LUA_OK; + compat53_reader_data compat53_data = { reader, data, 1, 0, 0 }; + compat53_data.peeked_data = reader(L, data, &(compat53_data.peeked_data_size)); + if (compat53_data.peeked_data && compat53_data.peeked_data_size && + compat53_data.peeked_data[0] == LUA_SIGNATURE[0]) /* binary file? */ + status = compat53_checkmode(L, mode, "binary", LUA_ERRSYNTAX); + else + status = compat53_checkmode(L, mode, "text", LUA_ERRSYNTAX); + if (status != LUA_OK) + return status; + /* we need to call the original 5.1 version of lua_load! */ +#undef lua_load + return lua_load(L, compat53_reader, &compat53_data, source); +#define lua_load COMPAT53_CONCAT(COMPAT53_PREFIX, _load_53) +} + + +typedef struct { + int n; /* number of pre-read characters */ + FILE *f; /* file being read */ + char buff[COMPAT53_LUA_FILE_BUFFER_SIZE]; /* area for reading file */ +} compat53_LoadF; + + +static const char *compat53_getF (lua_State *L, void *ud, size_t *size) { + compat53_LoadF *lf = (compat53_LoadF *)ud; + (void)L; /* not used */ + if (lf->n > 0) { /* are there pre-read characters to be read? */ + *size = lf->n; /* return them (chars already in buffer) */ + lf->n = 0; /* no more pre-read characters */ + } + else { /* read a block from file */ + /* 'fread' can return > 0 *and* set the EOF flag. If next call to + 'compat53_getF' called 'fread', it might still wait for user input. + The next check avoids this problem. */ + if (feof(lf->f)) return NULL; + *size = fread(lf->buff, 1, sizeof(lf->buff), lf->f); /* read block */ + } + return lf->buff; +} + + +static int compat53_errfile (lua_State *L, const char *what, int fnameindex) { + char buf[512] = {0}; + const char *serr = compat53_strerror(errno, buf, sizeof(buf)); + const char *filename = lua_tostring(L, fnameindex) + 1; + lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr); + lua_remove(L, fnameindex); + return LUA_ERRFILE; +} + + +static int compat53_skipBOM (compat53_LoadF *lf) { + const char *p = "\xEF\xBB\xBF"; /* UTF-8 BOM mark */ + int c; + lf->n = 0; + do { + c = getc(lf->f); + if (c == EOF || c != *(const unsigned char *)p++) return c; + lf->buff[lf->n++] = (char)c; /* to be read by the parser */ + } while (*p != '\0'); + lf->n = 0; /* prefix matched; discard it */ + return getc(lf->f); /* return next character */ +} + + +/* +** reads the first character of file 'f' and skips an optional BOM mark +** in its beginning plus its first line if it starts with '#'. Returns +** true if it skipped the first line. In any case, '*cp' has the +** first "valid" character of the file (after the optional BOM and +** a first-line comment). +*/ +static int compat53_skipcomment (compat53_LoadF *lf, int *cp) { + int c = *cp = compat53_skipBOM(lf); + if (c == '#') { /* first line is a comment (Unix exec. file)? */ + do { /* skip first line */ + c = getc(lf->f); + } while (c != EOF && c != '\n'); + *cp = getc(lf->f); /* skip end-of-line, if present */ + return 1; /* there was a comment */ + } + else return 0; /* no comment */ +} + + +COMPAT53_API int luaL_loadfilex (lua_State *L, const char *filename, const char *mode) { + compat53_LoadF lf; + int status, readstatus; + int c; + int fnameindex = lua_gettop(L) + 1; /* index of filename on the stack */ + if (filename == NULL) { + lua_pushliteral(L, "=stdin"); + lf.f = stdin; + } + else { + lua_pushfstring(L, "@%s", filename); +#if defined(_MSC_VER) + /* This code is here to stop a deprecation error that stops builds + * if a certain macro is defined. While normally not caring would + * be best, some header-only libraries and builds can't afford to + * dictate this to the user. A quick check shows that fopen_s this + * goes back to VS 2005, and _fsopen goes back to VS 2003 .NET, + * possibly even before that so we don't need to do any version + * number checks, since this has been there since forever. */ + + /* TO USER: if you want the behavior of typical fopen_s/fopen, + * which does lock the file on VC++, define the macro used below to 0 */ +#if COMPAT53_FOPEN_NO_LOCK + lf.f = _fsopen(filename, "r", _SH_DENYNO); /* do not lock the file in any way */ + if (lf.f == NULL) + return compat53_errfile(L, "open", fnameindex); +#else /* use default locking version */ + if (fopen_s(&lf.f, filename, "r") != 0) + return compat53_errfile(L, "open", fnameindex); +#endif /* Locking vs. No-locking fopen variants */ +#else + lf.f = fopen(filename, "r"); /* default stdlib doesn't forcefully lock files here */ + if (lf.f == NULL) return compat53_errfile(L, "open", fnameindex); +#endif + } + if (compat53_skipcomment(&lf, &c)) /* read initial portion */ + lf.buff[lf.n++] = '\n'; /* add line to correct line numbers */ + if (c == LUA_SIGNATURE[0] && filename) { /* binary file? */ +#if defined(_MSC_VER) + if (freopen_s(&lf.f, filename, "rb", lf.f) != 0) + return compat53_errfile(L, "reopen", fnameindex); +#else + lf.f = freopen(filename, "rb", lf.f); /* reopen in binary mode */ + if (lf.f == NULL) return compat53_errfile(L, "reopen", fnameindex); +#endif + compat53_skipcomment(&lf, &c); /* re-read initial portion */ + } + if (c != EOF) + lf.buff[lf.n++] = (char)c; /* 'c' is the first character of the stream */ + status = lua_load(L, &compat53_getF, &lf, lua_tostring(L, -1), mode); + readstatus = ferror(lf.f); + if (filename) fclose(lf.f); /* close file (even in case of errors) */ + if (readstatus) { + lua_settop(L, fnameindex); /* ignore results from 'lua_load' */ + return compat53_errfile(L, "read", fnameindex); + } + lua_remove(L, fnameindex); + return status; +} + + +COMPAT53_API int luaL_loadbufferx (lua_State *L, const char *buff, size_t sz, const char *name, const char *mode) { + int status = LUA_OK; + if (sz > 0 && buff[0] == LUA_SIGNATURE[0]) { + status = compat53_checkmode(L, mode, "binary", LUA_ERRSYNTAX); + } + else { + status = compat53_checkmode(L, mode, "text", LUA_ERRSYNTAX); + } + if (status != LUA_OK) + return status; + return luaL_loadbuffer(L, buff, sz, name); +} + + +#if !defined(l_inspectstat) && \ + (defined(unix) || defined(__unix) || defined(__unix__) || \ + defined(__TOS_AIX__) || defined(_SYSTYPE_BSD) || \ + (defined(__APPLE__) && defined(__MACH__))) +/* some form of unix; check feature macros in unistd.h for details */ +# include <unistd.h> +/* check posix version; the relevant include files and macros probably + * were available before 2001, but I'm not sure */ +# if defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L +# include <sys/wait.h> +# define l_inspectstat(stat,what) \ + if (WIFEXITED(stat)) { stat = WEXITSTATUS(stat); } \ + else if (WIFSIGNALED(stat)) { stat = WTERMSIG(stat); what = "signal"; } +# endif +#endif + +/* provide default (no-op) version */ +#if !defined(l_inspectstat) +# define l_inspectstat(stat,what) ((void)0) +#endif + + +COMPAT53_API int luaL_execresult (lua_State *L, int stat) { + const char *what = "exit"; + if (stat == -1) + return luaL_fileresult(L, 0, NULL); + else { + l_inspectstat(stat, what); + if (*what == 'e' && stat == 0) + lua_pushboolean(L, 1); + else + lua_pushnil(L); + lua_pushstring(L, what); + lua_pushinteger(L, stat); + return 3; + } +} + + +COMPAT53_API void luaL_buffinit (lua_State *L, luaL_Buffer_53 *B) { + /* make it crash if used via pointer to a 5.1-style luaL_Buffer */ + B->b.p = NULL; + B->b.L = NULL; + B->b.lvl = 0; + /* reuse the buffer from the 5.1-style luaL_Buffer though! */ + B->ptr = B->b.buffer; + B->capacity = LUAL_BUFFERSIZE; + B->nelems = 0; + B->L2 = L; +} + + +COMPAT53_API char *luaL_prepbuffsize (luaL_Buffer_53 *B, size_t s) { + if (B->capacity - B->nelems < s) { /* needs to grow */ + char* newptr = NULL; + size_t newcap = B->capacity * 2; + if (newcap - B->nelems < s) + newcap = B->nelems + s; + if (newcap < B->capacity) /* overflow */ + luaL_error(B->L2, "buffer too large"); + newptr = (char*)lua_newuserdata(B->L2, newcap); + memcpy(newptr, B->ptr, B->nelems); + if (B->ptr != B->b.buffer) + lua_replace(B->L2, -2); /* remove old buffer */ + B->ptr = newptr; + B->capacity = newcap; + } + return B->ptr+B->nelems; +} + + +COMPAT53_API void luaL_addlstring (luaL_Buffer_53 *B, const char *s, size_t l) { + memcpy(luaL_prepbuffsize(B, l), s, l); + luaL_addsize(B, l); +} + + +COMPAT53_API void luaL_addvalue (luaL_Buffer_53 *B) { + size_t len = 0; + const char *s = lua_tolstring(B->L2, -1, &len); + if (!s) + luaL_error(B->L2, "cannot convert value to string"); + if (B->ptr != B->b.buffer) + lua_insert(B->L2, -2); /* userdata buffer must be at stack top */ + luaL_addlstring(B, s, len); + lua_remove(B->L2, B->ptr != B->b.buffer ? -2 : -1); +} + + +void luaL_pushresult (luaL_Buffer_53 *B) { + lua_pushlstring(B->L2, B->ptr, B->nelems); + if (B->ptr != B->b.buffer) + lua_replace(B->L2, -2); /* remove userdata buffer */ +} + + +#endif /* Lua 5.1 */ + + + +/* definitions for Lua 5.1 and Lua 5.2 */ +#if defined( LUA_VERSION_NUM ) && LUA_VERSION_NUM <= 502 + + +COMPAT53_API int lua_geti (lua_State *L, int index, lua_Integer i) { + index = lua_absindex(L, index); + lua_pushinteger(L, i); + lua_gettable(L, index); + return lua_type(L, -1); +} + + +COMPAT53_API int lua_isinteger (lua_State *L, int index) { + if (lua_type(L, index) == LUA_TNUMBER) { + lua_Number n = lua_tonumber(L, index); + lua_Integer i = lua_tointeger(L, index); + if (i == n) + return 1; + } + return 0; +} + + +COMPAT53_API lua_Integer lua_tointegerx (lua_State *L, int i, int *isnum) { + int ok = 0; + lua_Number n = lua_tonumberx(L, i, &ok); + if (ok) { + if (n == (lua_Integer)n) { + if (isnum) + *isnum = 1; + return (lua_Integer)n; + } + } + if (isnum) + *isnum = 0; + return 0; +} + + +static void compat53_reverse (lua_State *L, int a, int b) { + for (; a < b; ++a, --b) { + lua_pushvalue(L, a); + lua_pushvalue(L, b); + lua_replace(L, a); + lua_replace(L, b); + } +} + + +COMPAT53_API void lua_rotate (lua_State *L, int idx, int n) { + int n_elems = 0; + idx = lua_absindex(L, idx); + n_elems = lua_gettop(L)-idx+1; + if (n < 0) + n += n_elems; + if ( n > 0 && n < n_elems) { + luaL_checkstack(L, 2, "not enough stack slots available"); + n = n_elems - n; + compat53_reverse(L, idx, idx+n-1); + compat53_reverse(L, idx+n, idx+n_elems-1); + compat53_reverse(L, idx, idx+n_elems-1); + } +} + + +COMPAT53_API void lua_seti (lua_State *L, int index, lua_Integer i) { + luaL_checkstack(L, 1, "not enough stack slots available"); + index = lua_absindex(L, index); + lua_pushinteger(L, i); + lua_insert(L, -2); + lua_settable(L, index); +} + + +#if !defined(lua_str2number) +# define lua_str2number(s, p) strtod((s), (p)) +#endif + +COMPAT53_API size_t lua_stringtonumber (lua_State *L, const char *s) { + char* endptr; + lua_Number n = lua_str2number(s, &endptr); + if (endptr != s) { + while (*endptr != '\0' && isspace((unsigned char)*endptr)) + ++endptr; + if (*endptr == '\0') { + lua_pushnumber(L, n); + return endptr - s + 1; + } + } + return 0; +} + + +COMPAT53_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len) { + if (!luaL_callmeta(L, idx, "__tostring")) { + int t = lua_type(L, idx), tt = 0; + char const* name = NULL; + switch (t) { + case LUA_TNIL: + lua_pushliteral(L, "nil"); + break; + case LUA_TSTRING: + case LUA_TNUMBER: + lua_pushvalue(L, idx); + break; + case LUA_TBOOLEAN: + if (lua_toboolean(L, idx)) + lua_pushliteral(L, "true"); + else + lua_pushliteral(L, "false"); + break; + default: + tt = luaL_getmetafield(L, idx, "__name"); + name = (tt == LUA_TSTRING) ? lua_tostring(L, -1) : lua_typename(L, t); + lua_pushfstring(L, "%s: %p", name, lua_topointer(L, idx)); + if (tt != LUA_TNIL) + lua_replace(L, -2); + break; + } + } else { + if (!lua_isstring(L, -1)) + luaL_error(L, "'__tostring' must return a string"); + } + return lua_tolstring(L, -1, len); +} + + +COMPAT53_API void luaL_requiref (lua_State *L, const char *modname, + lua_CFunction openf, int glb) { + luaL_checkstack(L, 3, "not enough stack slots available"); + luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED"); + if (lua_getfield(L, -1, modname) == LUA_TNIL) { + lua_pop(L, 1); + lua_pushcfunction(L, openf); + lua_pushstring(L, modname); + lua_call(L, 1, 1); + lua_pushvalue(L, -1); + lua_setfield(L, -3, modname); + } + if (glb) { + lua_pushvalue(L, -1); + lua_setglobal(L, modname); + } + lua_replace(L, -2); +} + + +#endif /* Lua 5.1 and 5.2 */ + + +#endif /* COMPAT53_C_ */ + + +/********************************************************************* +* This file contains parts of Lua 5.2's and Lua 5.3's source code: +* +* Copyright (C) 1994-2014 Lua.org, PUC-Rio. +* +* Permission is hereby granted, free of charge, to any person obtaining +* a copy of this software and associated documentation files (the +* "Software"), to deal in the Software without restriction, including +* without limitation the rights to use, copy, modify, merge, publish, +* distribute, sublicense, and/or sell copies of the Software, and to +* permit persons to whom the Software is furnished to do so, subject to +* the following conditions: +* +* The above copyright notice and this permission notice shall be +* included in all copies or substantial portions of the Software. +* +* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. +* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, +* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE +* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +*********************************************************************/ + |