Clean up TValue to buffer conversions.

src/lib_base.c

@@ -506,21 +506,13 @@ LJLIB_CF(print)
   }
   shortcut = (tvisfunc(tv) && funcV(tv)->c.ffid == FF_tostring);
   for (i = 0; i < nargs; i++) {
+    cTValue *o = &L->base[i];
+    char buf[LJ_STR_NUMBERBUF];
     const char *str;
     size_t size;
-    cTValue *o = &L->base[i];
-    if (shortcut && tvisstr(o)) {
-      str = strVdata(o);
-      size = strV(o)->len;
-    } else if (shortcut && tvisint(o)) {
-      char buf[LJ_STR_INTBUF];
-      char *p = lj_str_bufint(buf, intV(o));
-      size = (size_t)(buf+LJ_STR_INTBUF-p);
-      str = p;
-    } else if (shortcut && tvisnum(o)) {
-      char buf[LJ_STR_NUMBUF];
-      size = lj_str_bufnum(buf, o);
-      str = buf;
+    MSize len;
+    if (shortcut && (str = lj_str_buftv(buf, o, &len)) != NULL) {
+      size = len;
     } else {
       copyTV(L, L->top+1, o);
       copyTV(L, L->top, L->top-1);

src/lib_io.c

@@ -231,19 +231,12 @@ static int io_file_write(lua_State *L, FILE *fp, int start)
   cTValue *tv;
   int status = 1;
   for (tv = L->base+start; tv < L->top; tv++) {
-    if (tvisstr(tv)) {
-      MSize len = strV(tv)->len;
-      status = status && (fwrite(strVdata(tv), 1, len, fp) == len);
-    } else if (tvisint(tv)) {
-      char buf[LJ_STR_INTBUF];
-      char *p = lj_str_bufint(buf, intV(tv));
-      size_t len = (size_t)(buf+LJ_STR_INTBUF-p);
-      status = status && (fwrite(p, 1, len, fp) == len);
-    } else if (tvisnum(tv)) {
-      status = status && (fprintf(fp, LUA_NUMBER_FMT, numV(tv)) > 0);
-    } else {
+    char buf[LJ_STR_NUMBERBUF];
+    MSize len;
+    const char *p = lj_str_buftv(buf, tv, &len);
+    if (!p)
       lj_err_argt(L, (int)(tv - L->base) + 1, LUA_TSTRING);
-    }
+    status = status && (fwrite(p, 1, len, fp) == len);
   }
   if (LJ_52 && status) {
     L->top = L->base+1;

src/lib_string.c

@@ -873,7 +873,7 @@ LJLIB_CF(string_format)
 	if (LJ_UNLIKELY((tv.u32.hi << 1) >= 0xffe00000)) {
 	  /* Canonicalize output of non-finite values. */
 	  char *p, nbuf[LJ_STR_NUMBUF];
-	  size_t len = lj_str_bufnum(nbuf, &tv);
+	  MSize len = lj_str_bufnum(nbuf, &tv);
 	  if (strfrmt[-1] < 'a') {
 	    nbuf[len-3] = nbuf[len-3] - 0x20;
 	    nbuf[len-2] = nbuf[len-2] - 0x20;

src/lj_ctype.c

@@ -570,7 +570,7 @@ GCstr *lj_ctype_repr_complex(lua_State *L, void *sp, CTSize size)
 {
   char buf[2*LJ_STR_NUMBUF+2+1];
   TValue re, im;
-  size_t len;
+  MSize len;
   if (size == 2*sizeof(double)) {
     re.n = *(double *)sp; im.n = ((double *)sp)[1];
   } else {

src/lj_str.c

@@ -168,14 +168,14 @@ void LJ_FASTCALL lj_str_free(global_State *g, GCstr *s)
 /* -- Type conversions ---------------------------------------------------- */
 
 /* Print number to buffer. Canonicalizes non-finite values. */
-size_t LJ_FASTCALL lj_str_bufnum(char *s, cTValue *o)
+MSize LJ_FASTCALL lj_str_bufnum(char *s, cTValue *o)
 {
   if (LJ_LIKELY((o->u32.hi << 1) < 0xffe00000)) {  /* Finite? */
     lua_Number n = o->n;
 #if __BIONIC__
     if (tvismzero(o)) { s[0] = '-'; s[1] = '0'; return 2; }
 #endif
-    return (size_t)lua_number2str(s, n);
+    return (MSize)lua_number2str(s, n);
   } else if (((o->u32.hi & 0x000fffff) | o->u32.lo) != 0) {
     s[0] = 'n'; s[1] = 'a'; s[2] = 'n'; return 3;
   } else if ((o->u32.hi & 0x80000000) == 0) {
@@ -185,30 +185,48 @@ size_t LJ_FASTCALL lj_str_bufnum(char *s, cTValue *o)
   }
 }
 
-/* Print integer to buffer. Returns pointer to start. */
-char * LJ_FASTCALL lj_str_bufint(char *p, int32_t k)
+/* Print integer to buffer. Returns pointer to start (!= buffer start). */
+static char * str_bufint(char *p, int32_t k)
 {
   uint32_t u = (uint32_t)(k < 0 ? -k : k);
-  p += 1+10;
+  p += LJ_STR_INTBUF;
   do { *--p = (char)('0' + u % 10); } while (u /= 10);
   if (k < 0) *--p = '-';
   return p;
 }
 
+/* Print TValue to buffer (only for numbers) and return pointer to start. */
+const char *lj_str_buftv(char *buf, cTValue *o, MSize *lenp)
+{
+  if (tvisstr(o)) {
+    *lenp = strV(o)->len;
+    return strVdata(o);
+  } else if (tvisint(o)) {
+    char *p = str_bufint(buf, intV(o));
+    *lenp = (MSize)(buf+LJ_STR_INTBUF-p);
+    return p;
+  } else if (tvisnum(o)) {
+    *lenp = lj_str_bufnum(buf, o);
+    return buf;
+  } else {
+    return NULL;
+  }
+}
+
 /* Convert number to string. */
 GCstr * LJ_FASTCALL lj_str_fromnum(lua_State *L, const lua_Number *np)
 {
   char buf[LJ_STR_NUMBUF];
-  size_t len = lj_str_bufnum(buf, (TValue *)np);
+  MSize len = lj_str_bufnum(buf, (TValue *)np);
   return lj_str_new(L, buf, len);
 }
 
 /* Convert integer to string. */
 GCstr * LJ_FASTCALL lj_str_fromint(lua_State *L, int32_t k)
 {
-  char s[1+10];
-  char *p = lj_str_bufint(s, k);
-  return lj_str_new(L, p, (size_t)(s+sizeof(s)-p));
+  char buf[LJ_STR_INTBUF];
+  char *p = str_bufint(buf, k);
+  return lj_str_new(L, p, (size_t)(buf+sizeof(buf)-p));
 }
 
 GCstr * LJ_FASTCALL lj_str_fromnumber(lua_State *L, cTValue *o)
@@ -242,7 +260,7 @@ const char *lj_str_pushvf(lua_State *L, const char *fmt, va_list argp)
       break;
     case 'd': {
       char buf[LJ_STR_INTBUF];
-      char *p = lj_str_bufint(buf, va_arg(argp, int32_t));
+      char *p = str_bufint(buf, va_arg(argp, int32_t));
       lj_buf_putmem(sb, p, (MSize)(buf+LJ_STR_INTBUF-p));
       break;
       }

src/lj_str.h

@@ -20,14 +20,15 @@ LJ_FUNC void LJ_FASTCALL lj_str_free(global_State *g, GCstr *s);
 #define lj_str_newlit(L, s)	(lj_str_new(L, "" s, sizeof(s)-1))
 
 /* Type conversions. */
-LJ_FUNC size_t LJ_FASTCALL lj_str_bufnum(char *s, cTValue *o);
-LJ_FUNC char * LJ_FASTCALL lj_str_bufint(char *p, int32_t k);
+LJ_FUNC MSize LJ_FASTCALL lj_str_bufnum(char *s, cTValue *o);
+LJ_FUNC const char *lj_str_buftv(char *buf, cTValue *o, MSize *lenp);
 LJ_FUNCA GCstr * LJ_FASTCALL lj_str_fromnum(lua_State *L, const lua_Number *np);
 LJ_FUNC GCstr * LJ_FASTCALL lj_str_fromint(lua_State *L, int32_t k);
 LJ_FUNCA GCstr * LJ_FASTCALL lj_str_fromnumber(lua_State *L, cTValue *o);
 
 #define LJ_STR_INTBUF		(1+10)
 #define LJ_STR_NUMBUF		LUAI_MAXNUMBER2STR
+#define LJ_STR_NUMBERBUF	LUAI_MAXNUMBER2STR
 
 /* String formatting. */
 LJ_FUNC const char *lj_str_pushvf(lua_State *L, const char *fmt, va_list argp);