summaryrefslogtreecommitdiff
path: root/Build/source/libs/luajit/LuaJIT-2.1.0-beta1/src/lj_strfmt.c
blob: d54e796ae2a31dce9e8b1d9546cdfc9d37d52615 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
/*
** String formatting.
** Copyright (C) 2005-2015 Mike Pall. See Copyright Notice in luajit.h
*/

#include <stdio.h>

#define lj_strfmt_c
#define LUA_CORE

#include "lj_obj.h"
#include "lj_buf.h"
#include "lj_str.h"
#include "lj_state.h"
#include "lj_char.h"
#include "lj_strfmt.h"

/* -- Format parser ------------------------------------------------------- */

static const uint8_t strfmt_map[('x'-'A')+1] = {
  STRFMT_A,0,0,0,STRFMT_E,0,STRFMT_G,0,0,0,0,0,0,
  0,0,0,0,0,0,0,0,0,0,STRFMT_X,0,0,
  0,0,0,0,0,0,
  STRFMT_A,0,STRFMT_C,STRFMT_D,STRFMT_E,STRFMT_F,STRFMT_G,0,STRFMT_I,0,0,0,0,
  0,STRFMT_O,STRFMT_P,STRFMT_Q,0,STRFMT_S,0,STRFMT_U,0,0,STRFMT_X
};

SFormat LJ_FASTCALL lj_strfmt_parse(FormatState *fs)
{
  const uint8_t *p = fs->p, *e = fs->e;
  fs->str = (const char *)p;
  for (; p < e; p++) {
    if (*p == '%') {  /* Escape char? */
      if (p[1] == '%') {  /* '%%'? */
	fs->p = ++p+1;
	goto retlit;
      } else {
	SFormat sf = 0;
	uint32_t c;
	if (p != (const uint8_t *)fs->str)
	  break;
	for (p++; (uint32_t)*p - ' ' <= (uint32_t)('0' - ' '); p++) {
	  /* Parse flags. */
	  if (*p == '-') sf |= STRFMT_F_LEFT;
	  else if (*p == '+') sf |= STRFMT_F_PLUS;
	  else if (*p == '0') sf |= STRFMT_F_ZERO;
	  else if (*p == ' ') sf |= STRFMT_F_SPACE;
	  else if (*p == '#') sf |= STRFMT_F_ALT;
	  else break;
	}
	if ((uint32_t)*p - '0' < 10) {  /* Parse width. */
	  uint32_t width = (uint32_t)*p++ - '0';
	  if ((uint32_t)*p - '0' < 10)
	    width = (uint32_t)*p++ - '0' + width*10;
	  sf |= (width << STRFMT_SH_WIDTH);
	}
	if (*p == '.') {  /* Parse precision. */
	  uint32_t prec = 0;
	  p++;
	  if ((uint32_t)*p - '0' < 10) {
	    prec = (uint32_t)*p++ - '0';
	    if ((uint32_t)*p - '0' < 10)
	      prec = (uint32_t)*p++ - '0' + prec*10;
	  }
	  sf |= ((prec+1) << STRFMT_SH_PREC);
	}
	/* Parse conversion. */
	c = (uint32_t)*p - 'A';
	if (LJ_LIKELY(c <= (uint32_t)('x' - 'A'))) {
	  uint32_t sx = strfmt_map[c];
	  if (sx) {
	    fs->p = p+1;
	    return (sf | sx | ((c & 0x20) ? 0 : STRFMT_F_UPPER));
	  }
	}
	/* Return error location. */
	if (*p >= 32) p++;
	fs->len = (MSize)(p - (const uint8_t *)fs->str);
	fs->p = fs->e;
	return STRFMT_ERR;
      }
    }
  }
  fs->p = p;
retlit:
  fs->len = (MSize)(p - (const uint8_t *)fs->str);
  return fs->len ? STRFMT_LIT : STRFMT_EOF;
}

/* -- Raw conversions ----------------------------------------------------- */

/* Write number to bufer. */
char * LJ_FASTCALL lj_strfmt_wnum(char *p, cTValue *o)
{
  if (LJ_LIKELY((o->u32.hi << 1) < 0xffe00000)) {  /* Finite? */
#if __BIONIC__
    if (tvismzero(o)) { *p++ = '-'; *p++ = '0'; return p; }
#endif
    return p + lua_number2str(p, o->n);
  } else if (((o->u32.hi & 0x000fffff) | o->u32.lo) != 0) {
    *p++ = 'n'; *p++ = 'a'; *p++ = 'n';
  } else if ((o->u32.hi & 0x80000000) == 0) {
    *p++ = 'i'; *p++ = 'n'; *p++ = 'f';
  } else {
    *p++ = '-'; *p++ = 'i'; *p++ = 'n'; *p++ = 'f';
  }
  return p;
}

#define WINT_R(x, sh, sc) \
  { uint32_t d = (x*(((1<<sh)+sc-1)/sc))>>sh; x -= d*sc; *p++ = (char)('0'+d); }

/* Write integer to buffer. */
char * LJ_FASTCALL lj_strfmt_wint(char *p, int32_t k)
{
  uint32_t u = (uint32_t)k;
  if (k < 0) { u = (uint32_t)-k; *p++ = '-'; }
  if (u < 10000) {
    if (u < 10) goto dig1; if (u < 100) goto dig2; if (u < 1000) goto dig3;
  } else {
    uint32_t v = u / 10000; u -= v * 10000;
    if (v < 10000) {
      if (v < 10) goto dig5; if (v < 100) goto dig6; if (v < 1000) goto dig7;
    } else {
      uint32_t w = v / 10000; v -= w * 10000;
      if (w >= 10) WINT_R(w, 10, 10)
      *p++ = (char)('0'+w);
    }
    WINT_R(v, 23, 1000)
    dig7: WINT_R(v, 12, 100)
    dig6: WINT_R(v, 10, 10)
    dig5: *p++ = (char)('0'+v);
  }
  WINT_R(u, 23, 1000)
  dig3: WINT_R(u, 12, 100)
  dig2: WINT_R(u, 10, 10)
  dig1: *p++ = (char)('0'+u);
  return p;
}
#undef WINT_R

/* Write pointer to buffer. */
char * LJ_FASTCALL lj_strfmt_wptr(char *p, const void *v)
{
  ptrdiff_t x = (ptrdiff_t)v;
  MSize i, n = STRFMT_MAXBUF_PTR;
  if (x == 0) {
    *p++ = 'N'; *p++ = 'U'; *p++ = 'L'; *p++ = 'L';
    return p;
  }
#if LJ_64
  /* Shorten output for 64 bit pointers. */
  n = 2+2*4+((x >> 32) ? 2+2*(lj_fls((uint32_t)(x >> 32))>>3) : 0);
#endif
  p[0] = '0';
  p[1] = 'x';
  for (i = n-1; i >= 2; i--, x >>= 4)
    p[i] = "0123456789abcdef"[(x & 15)];
  return p+n;
}

/* Write ULEB128 to buffer. */
char * LJ_FASTCALL lj_strfmt_wuleb128(char *p, uint32_t v)
{
  for (; v >= 0x80; v >>= 7)
    *p++ = (char)((v & 0x7f) | 0x80);
  *p++ = (char)v;
  return p;
}

/* Return string or write number to buffer and return pointer to start. */
const char *lj_strfmt_wstrnum(char *buf, cTValue *o, MSize *lenp)
{
  if (tvisstr(o)) {
    *lenp = strV(o)->len;
    return strVdata(o);
  } else if (tvisint(o)) {
    *lenp = (MSize)(lj_strfmt_wint(buf, intV(o)) - buf);
    return buf;
  } else if (tvisnum(o)) {
    *lenp = (MSize)(lj_strfmt_wnum(buf, o) - buf);
    return buf;
  } else {
    return NULL;
  }
}

/* -- Unformatted conversions to buffer ----------------------------------- */

/* Add integer to buffer. */
SBuf * LJ_FASTCALL lj_strfmt_putint(SBuf *sb, int32_t k)
{
  setsbufP(sb, lj_strfmt_wint(lj_buf_more(sb, STRFMT_MAXBUF_INT), k));
  return sb;
}

#if LJ_HASJIT
/* Add number to buffer. */
SBuf * LJ_FASTCALL lj_strfmt_putnum(SBuf *sb, cTValue *o)
{
  setsbufP(sb, lj_strfmt_wnum(lj_buf_more(sb, STRFMT_MAXBUF_NUM), o));
  return sb;
}
#endif

SBuf * LJ_FASTCALL lj_strfmt_putptr(SBuf *sb, const void *v)
{
  setsbufP(sb, lj_strfmt_wptr(lj_buf_more(sb, STRFMT_MAXBUF_PTR), v));
  return sb;
}

/* Add quoted string to buffer. */
SBuf * LJ_FASTCALL lj_strfmt_putquoted(SBuf *sb, GCstr *str)
{
  const char *s = strdata(str);
  MSize len = str->len;
  lj_buf_putb(sb, '"');
  while (len--) {
    uint32_t c = (uint32_t)(uint8_t)*s++;
    char *p = lj_buf_more(sb, 4);
    if (c == '"' || c == '\\' || c == '\n') {
      *p++ = '\\';
    } else if (lj_char_iscntrl(c)) {  /* This can only be 0-31 or 127. */
      uint32_t d;
      *p++ = '\\';
      if (c >= 100 || lj_char_isdigit((uint8_t)*s)) {
	*p++ = (char)('0'+(c >= 100)); if (c >= 100) c -= 100;
	goto tens;
      } else if (c >= 10) {
      tens:
	d = (c * 205) >> 11; c -= d * 10; *p++ = (char)('0'+d);
      }
      c += '0';
    }
    *p++ = (char)c;
    setsbufP(sb, p);
  }
  lj_buf_putb(sb, '"');
  return sb;
}

/* -- Formatted conversions to buffer ------------------------------------- */

/* Add formatted char to buffer. */
SBuf *lj_strfmt_putfchar(SBuf *sb, SFormat sf, int32_t c)
{
  MSize width = STRFMT_WIDTH(sf);
  char *p = lj_buf_more(sb, width > 1 ? width : 1);
  if ((sf & STRFMT_F_LEFT)) *p++ = (char)c;
  while (width-- > 1) *p++ = ' ';
  if (!(sf & STRFMT_F_LEFT)) *p++ = (char)c;
  setsbufP(sb, p);
  return sb;
}

/* Add formatted string to buffer. */
SBuf *lj_strfmt_putfstr(SBuf *sb, SFormat sf, GCstr *str)
{
  MSize len = str->len <= STRFMT_PREC(sf) ? str->len : STRFMT_PREC(sf);
  MSize width = STRFMT_WIDTH(sf);
  char *p = lj_buf_more(sb, width > len ? width : len);
  if ((sf & STRFMT_F_LEFT)) p = lj_buf_wmem(p, strdata(str), len);
  while (width-- > len) *p++ = ' ';
  if (!(sf & STRFMT_F_LEFT)) p = lj_buf_wmem(p, strdata(str), len);
  setsbufP(sb, p);
  return sb;
}

/* Add formatted signed/unsigned integer to buffer. */
SBuf *lj_strfmt_putfxint(SBuf *sb, SFormat sf, uint64_t k)
{
  char buf[STRFMT_MAXBUF_XINT], *q = buf + sizeof(buf), *p;
#ifdef LUA_USE_ASSERT
  char *ps;
#endif
  MSize prefix = 0, len, prec, pprec, width, need;

  /* Figure out signed prefixes. */
  if (STRFMT_TYPE(sf) == STRFMT_INT) {
    if ((int64_t)k < 0) {
      k = (uint64_t)-(int64_t)k;
      prefix = 256 + '-';
    } else if ((sf & STRFMT_F_PLUS)) {
      prefix = 256 + '+';
    } else if ((sf & STRFMT_F_SPACE)) {
      prefix = 256 + ' ';
    }
  }

  /* Convert number and store to fixed-size buffer in reverse order. */
  prec = STRFMT_PREC(sf);
  if ((int32_t)prec >= 0) sf &= ~STRFMT_F_ZERO;
  if (k == 0) {  /* Special-case zero argument. */
    if (prec != 0 ||
	(sf & (STRFMT_T_OCT|STRFMT_F_ALT)) == (STRFMT_T_OCT|STRFMT_F_ALT))
      *--q = '0';
  } else if (!(sf & (STRFMT_T_HEX|STRFMT_T_OCT))) {  /* Decimal. */
    uint32_t k2;
    while ((k >> 32)) { *--q = (char)('0' + k % 10); k /= 10; }
    k2 = (uint32_t)k;
    do { *--q = (char)('0' + k2 % 10); k2 /= 10; } while (k2);
  } else if ((sf & STRFMT_T_HEX)) {  /* Hex. */
    const char *hexdig = (sf & STRFMT_F_UPPER) ? "0123456789ABCDEF" :
						 "0123456789abcdef";
    do { *--q = hexdig[(k & 15)]; k >>= 4; } while (k);
    if ((sf & STRFMT_F_ALT)) prefix = 512 + ((sf & STRFMT_F_UPPER) ? 'X' : 'x');
  } else {  /* Octal. */
    do { *--q = (char)('0' + (uint32_t)(k & 7)); k >>= 3; } while (k);
    if ((sf & STRFMT_F_ALT)) *--q = '0';
  }

  /* Calculate sizes. */
  len = (MSize)(buf + sizeof(buf) - q);
  if ((int32_t)len >= (int32_t)prec) prec = len;
  width = STRFMT_WIDTH(sf);
  pprec = prec + (prefix >> 8);
  need = width > pprec ? width : pprec;
  p = lj_buf_more(sb, need);
#ifdef LUA_USE_ASSERT
  ps = p;
#endif

  /* Format number with leading/trailing whitespace and zeros. */
  if ((sf & (STRFMT_F_LEFT|STRFMT_F_ZERO)) == 0)
    while (width-- > pprec) *p++ = ' ';
  if (prefix) {
    if ((char)prefix >= 'X') *p++ = '0';
    *p++ = (char)prefix;
  }
  if ((sf & (STRFMT_F_LEFT|STRFMT_F_ZERO)) == STRFMT_F_ZERO)
    while (width-- > pprec) *p++ = '0';
  while (prec-- > len) *p++ = '0';
  while (q < buf + sizeof(buf)) *p++ = *q++;  /* Add number itself. */
  if ((sf & STRFMT_F_LEFT))
    while (width-- > pprec) *p++ = ' ';

  lua_assert(need == (MSize)(p - ps));
  setsbufP(sb, p);
  return sb;
}

/* Add number formatted as signed integer to buffer. */
SBuf *lj_strfmt_putfnum_int(SBuf *sb, SFormat sf, lua_Number n)
{
  int64_t k = (int64_t)n;
  if (checki32(k) && sf == STRFMT_INT)
    return lj_strfmt_putint(sb, (int32_t)k);  /* Shortcut for plain %d. */
  else
    return lj_strfmt_putfxint(sb, sf, (uint64_t)k);
}

/* Add number formatted as unsigned integer to buffer. */
SBuf *lj_strfmt_putfnum_uint(SBuf *sb, SFormat sf, lua_Number n)
{
  int64_t k;
  if (n >= 9223372036854775808.0)
    k = (int64_t)(n - 18446744073709551616.0);
  else
    k = (int64_t)n;
  return lj_strfmt_putfxint(sb, sf, (uint64_t)k);
}

/* Max. sprintf buffer size needed. At least #string.format("%.99f", -1e308). */
#define STRFMT_FMTNUMBUF	512

/* Add formatted floating-point number to buffer. */
SBuf *lj_strfmt_putfnum(SBuf *sb, SFormat sf, lua_Number n)
{
  TValue tv;
  tv.n = n;
  if (LJ_UNLIKELY((tv.u32.hi << 1) >= 0xffe00000)) {
    /* Canonicalize output of non-finite values. */
    MSize width = STRFMT_WIDTH(sf), len = 3;
    int prefix = 0, ch = (sf & STRFMT_F_UPPER) ? 0x202020 : 0;
    char *p;
    if (((tv.u32.hi & 0x000fffff) | tv.u32.lo) != 0) {
      ch ^= ('n' << 16) | ('a' << 8) | 'n';
      if ((sf & STRFMT_F_SPACE)) prefix = ' ';
    } else {
      ch ^= ('i' << 16) | ('n' << 8) | 'f';
      if ((tv.u32.hi & 0x80000000)) prefix = '-';
      else if ((sf & STRFMT_F_PLUS)) prefix = '+';
      else if ((sf & STRFMT_F_SPACE)) prefix = ' ';
    }
    if (prefix) len = 4;
    p = lj_buf_more(sb, width > len ? width : len);
    if (!(sf & STRFMT_F_LEFT)) while (width-- > len) *p++ = ' ';
    if (prefix) *p++ = prefix;
    *p++ = (char)(ch >> 16); *p++ = (char)(ch >> 8); *p++ = (char)ch;
    if ((sf & STRFMT_F_LEFT)) while (width-- > len) *p++ = ' ';
    setsbufP(sb, p);
  } else {  /* Delegate to sprintf() for now. */
    uint8_t width = (uint8_t)STRFMT_WIDTH(sf), prec = (uint8_t)STRFMT_PREC(sf);
    char fmt[1+5+2+3+1+1], *p = fmt;
    *p++ = '%';
    if ((sf & STRFMT_F_LEFT)) *p++ = '-';
    if ((sf & STRFMT_F_PLUS)) *p++ = '+';
    if ((sf & STRFMT_F_ZERO)) *p++ = '0';
    if ((sf & STRFMT_F_SPACE)) *p++ = ' ';
    if ((sf & STRFMT_F_ALT)) *p++ = '#';
    if (width) {
      uint8_t x = width / 10, y = width % 10;
      if (x) *p++ = '0' + x;
      *p++ = '0' + y;
    }
    if (prec != 255) {
      uint8_t x = prec / 10, y = prec % 10;
      *p++ = '.';
      if (x) *p++ = '0' + x;
      *p++ = '0' + y;
    }
    *p++ = (0x67666561 >> (STRFMT_FP(sf)<<3)) ^ ((sf & STRFMT_F_UPPER)?0x20:0);
    *p = '\0';
    p = lj_buf_more(sb, STRFMT_FMTNUMBUF);
    setsbufP(sb, p + sprintf(p, fmt, n));
  }
  return sb;
}

/* -- Conversions to strings ---------------------------------------------- */

/* Convert integer to string. */
GCstr * LJ_FASTCALL lj_strfmt_int(lua_State *L, int32_t k)
{
  char buf[STRFMT_MAXBUF_INT];
  MSize len = (MSize)(lj_strfmt_wint(buf, k) - buf);
  return lj_str_new(L, buf, len);
}

/* Convert number to string. */
GCstr * LJ_FASTCALL lj_strfmt_num(lua_State *L, cTValue *o)
{
  char buf[STRFMT_MAXBUF_NUM];
  MSize len = (MSize)(lj_strfmt_wnum(buf, o) - buf);
  return lj_str_new(L, buf, len);
}

/* Convert integer or number to string. */
GCstr * LJ_FASTCALL lj_strfmt_number(lua_State *L, cTValue *o)
{
  return tvisint(o) ? lj_strfmt_int(L, intV(o)) : lj_strfmt_num(L, o);
}

#if LJ_HASJIT
/* Convert char value to string. */
GCstr * LJ_FASTCALL lj_strfmt_char(lua_State *L, int c)
{
  char buf[1];
  buf[0] = c;
  return lj_str_new(L, buf, 1);
}
#endif

/* Raw conversion of object to string. */
GCstr * LJ_FASTCALL lj_strfmt_obj(lua_State *L, cTValue *o)
{
  if (tvisstr(o)) {
    return strV(o);
  } else if (tvisnumber(o)) {
    return lj_strfmt_number(L, o);
  } else if (tvisnil(o)) {
    return lj_str_newlit(L, "nil");
  } else if (tvisfalse(o)) {
    return lj_str_newlit(L, "false");
  } else if (tvistrue(o)) {
    return lj_str_newlit(L, "true");
  } else {
    char buf[8+2+2+16], *p = buf;
    p = lj_buf_wmem(p, lj_typename(o), (MSize)strlen(lj_typename(o)));
    *p++ = ':'; *p++ = ' ';
    if (tvisfunc(o) && isffunc(funcV(o))) {
      p = lj_buf_wmem(p, "builtin#", 8);
      p = lj_strfmt_wint(p, funcV(o)->c.ffid);
    } else {
      p = lj_strfmt_wptr(p, lj_obj_ptr(o));
    }
    return lj_str_new(L, buf, (size_t)(p - buf));
  }
}

/* -- Internal string formatting ------------------------------------------ */

/*
** These functions are only used for lua_pushfstring(), lua_pushvfstring()
** and for internal string formatting (e.g. error messages). Caveat: unlike
** string.format(), only a limited subset of formats and flags are supported!
**
** LuaJIT has support for a couple more formats than Lua 5.1/5.2:
** - %d %u %o %x with full formatting, 32 bit integers only.
** - %f and other FP formats are really %.14g.
** - %s %c %p without formatting.
*/

/* Push formatted message as a string object to Lua stack. va_list variant. */
const char *lj_strfmt_pushvf(lua_State *L, const char *fmt, va_list argp)
{
  SBuf *sb = lj_buf_tmp_(L);
  FormatState fs;
  SFormat sf;
  GCstr *str;
  lj_strfmt_init(&fs, fmt, (MSize)strlen(fmt));
  while ((sf = lj_strfmt_parse(&fs)) != STRFMT_EOF) {
    switch (STRFMT_TYPE(sf)) {
    case STRFMT_LIT:
      lj_buf_putmem(sb, fs.str, fs.len);
      break;
    case STRFMT_INT:
      lj_strfmt_putfxint(sb, sf, va_arg(argp, int32_t));
      break;
    case STRFMT_UINT:
      lj_strfmt_putfxint(sb, sf, va_arg(argp, uint32_t));
      break;
    case STRFMT_NUM: {
      TValue tv;
      tv.n = va_arg(argp, lua_Number);
      setsbufP(sb, lj_strfmt_wnum(lj_buf_more(sb, STRFMT_MAXBUF_NUM), &tv));
      break;
      }
    case STRFMT_STR: {
      const char *s = va_arg(argp, char *);
      if (s == NULL) s = "(null)";
      lj_buf_putmem(sb, s, (MSize)strlen(s));
      break;
      }
    case STRFMT_CHAR:
      lj_buf_putb(sb, va_arg(argp, int));
      break;
    case STRFMT_PTR:
      lj_strfmt_putptr(sb, va_arg(argp, void *));
      break;
    case STRFMT_ERR:
    default:
      lj_buf_putb(sb, '?');
      lua_assert(0);
      break;
    }
  }
  str = lj_buf_str(L, sb);
  setstrV(L, L->top, str);
  incr_top(L);
  return strdata(str);
}

/* Push formatted message as a string object to Lua stack. Vararg variant. */
const char *lj_strfmt_pushf(lua_State *L, const char *fmt, ...)
{
  const char *msg;
  va_list argp;
  va_start(argp, fmt);
  msg = lj_strfmt_pushvf(L, fmt, argp);
  va_end(argp);
  return msg;
}