1 /* $Id: sprintf.c,v 1.13 2003/09/12 17:51:48 vizzini Exp $
3 * COPYRIGHT: See COPYING in the top level directory
4 * PROJECT: ReactOS kernel
5 * FILE: lib/ntdll/stdio/sprintf.c
6 * PURPOSE: Single byte sprintf functions
7 * PROGRAMMERS: David Welch
13 * linux/lib/vsprintf.c
15 * Copyright (C) 1991, 1992 Linus Torvalds
18 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
20 * Wirzenius wrote this portably, Torvalds fucked it up :-)
23 #include <ddk/ntddk.h>
31 #include <ntdll/ntdll.h>
34 #define ZEROPAD 1 /* pad with zero */
35 #define SIGN 2 /* unsigned/signed long */
36 #define PLUS 4 /* show plus */
37 #define SPACE 8 /* space if plus */
38 #define LEFT 16 /* left justified */
39 #define SPECIAL 32 /* 0x */
40 #define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
43 #define do_div(n,base) ({ \
45 __res = ((unsigned long long) n) % (unsigned) base; \
46 n = ((unsigned long long) n) / (unsigned) base; \
50 static int skip_atoi(const char **s
)
55 i
= i
*10 + *((*s
)++) - '0';
61 number(char * buf
, char * end
, long long num
, int base
, int size
, int precision
, int type
)
65 const char *small_digits
= "0123456789abcdefghijklmnopqrstuvwxyz";
66 const char *large_digits
= "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
69 digits
= (type
& LARGE
) ? large_digits
: small_digits
;
72 if (base
< 2 || base
> 36)
74 c
= (type
& ZEROPAD
) ? '0' : ' ';
81 } else if (type
& PLUS
) {
84 } else if (type
& SPACE
) {
99 tmp
[i
++] = digits
[do_div(num
,base
)];
103 if (!(type
&(ZEROPAD
+LEFT
))) {
115 if (type
& SPECIAL
) {
120 } else if (base
==16) {
129 if (!(type
& LEFT
)) {
136 while (i
< precision
--) {
155 string(char* buf
, char* end
, const char* s
, int len
, int field_width
, int precision
, int flags
)
168 while (s
[len
] && (unsigned int)len
< (unsigned int)precision
)
173 if ((unsigned int)len
> (unsigned int)precision
)
178 while (len
< field_width
--)
184 for (i
= 0; i
< len
; ++i
)
190 while (len
< field_width
--)
200 stringw(char* buf
, char* end
, const wchar_t* sw
, int len
, int field_width
, int precision
, int flags
)
213 while (sw
[len
] && (unsigned int)len
< (unsigned int)precision
)
218 if ((unsigned int)len
> (unsigned int)precision
)
223 while (len
< field_width
--)
229 for (i
= 0; i
< len
; ++i
)
232 *buf
= (unsigned char)(*sw
++);
235 while (len
< field_width
--)
247 int _vsnprintf(char *buf
, size_t cnt
, const char *fmt
, va_list args
)
250 unsigned long long num
;
256 int flags
; /* flags to number() */
258 int field_width
; /* width of output field */
259 int precision
; /* min. # of digits for integers; max
260 number of chars for from string */
261 int qualifier
; /* 'h', 'l', 'L', 'I' or 'w' for integer fields */
270 for ( ; *fmt
; ++fmt
) {
281 ++fmt
; /* this also skips first '%' */
283 case '-': flags
|= LEFT
; goto repeat
;
284 case '+': flags
|= PLUS
; goto repeat
;
285 case ' ': flags
|= SPACE
; goto repeat
;
286 case '#': flags
|= SPECIAL
; goto repeat
;
287 case '0': flags
|= ZEROPAD
; goto repeat
;
290 /* get field width */
293 field_width
= skip_atoi(&fmt
);
294 else if (*fmt
== '*') {
296 /* it's the next argument */
297 field_width
= va_arg(args
, int);
298 if (field_width
< 0) {
299 field_width
= -field_width
;
304 /* get the precision */
309 precision
= skip_atoi(&fmt
);
310 else if (*fmt
== '*') {
312 /* it's the next argument */
313 precision
= va_arg(args
, int);
319 /* get the conversion qualifier */
321 if (*fmt
== 'h' || *fmt
== 'l' || *fmt
== 'L' || *fmt
== 'w') {
324 } else if (*fmt
== 'I' && *(fmt
+1) == '6' && *(fmt
+2) == '4') {
333 case 'c': /* finished */
335 while (--field_width
> 0) {
340 if (qualifier
== 'l' || qualifier
== 'w') {
342 *str
= (unsigned char)(wchar_t) va_arg(args
, int);
346 *str
= (unsigned char) va_arg(args
, int);
349 while (--field_width
> 0) {
356 case 'C': /* finished */
358 while (--field_width
> 0) {
363 if (qualifier
== 'h') {
365 *str
= (unsigned char) va_arg(args
, int);
369 *str
= (unsigned char)(wchar_t) va_arg(args
, int);
372 while (--field_width
> 0) {
379 case 's': /* finished */
380 if (qualifier
== 'l' || qualifier
== 'w') {
381 /* print unicode string */
382 sw
= va_arg(args
, wchar_t *);
383 str
= stringw(str
, end
, sw
, -1, field_width
, precision
, flags
);
385 /* print ascii string */
386 s
= va_arg(args
, char *);
387 str
= string(str
, end
, s
, -1, field_width
, precision
, flags
);
392 if (qualifier
== 'h') {
393 /* print ascii string */
394 s
= va_arg(args
, char *);
395 str
= string(str
, end
, s
, -1, field_width
, precision
, flags
);
397 /* print unicode string */
398 sw
= va_arg(args
, wchar_t *);
399 str
= stringw(str
, end
, sw
, -1, field_width
, precision
, flags
);
404 if (qualifier
== 'w') {
405 /* print counted unicode string */
406 PUNICODE_STRING pus
= va_arg(args
, PUNICODE_STRING
);
407 if ((pus
== NULL
) || (pus
->Buffer
== NULL
)) {
412 len
= pus
->Length
/ sizeof(WCHAR
);
414 str
= stringw(str
, end
, sw
, len
, field_width
, precision
, flags
);
416 /* print counted ascii string */
417 PANSI_STRING pus
= va_arg(args
, PANSI_STRING
);
418 if ((pus
== NULL
) || (pus
->Buffer
== NULL
)) {
425 str
= string(str
, end
, s
, len
, field_width
, precision
, flags
);
430 if (field_width
== -1) {
431 field_width
= 2 * sizeof(void *);
434 str
= number(str
, end
,
435 (unsigned long) va_arg(args
, void *), 16,
436 field_width
, precision
, flags
);
440 /* FIXME: What does C99 say about the overflow case here? */
441 if (qualifier
== 'l') {
442 long * ip
= va_arg(args
, long *);
445 int * ip
= va_arg(args
, int *);
450 /* integer number formats - set up the flags and "break" */
486 if (qualifier
== 'I')
487 num
= va_arg(args
, unsigned long long);
488 else if (qualifier
== 'l')
489 num
= va_arg(args
, unsigned long);
490 else if (qualifier
== 'h') {
492 num
= va_arg(args
, int);
494 num
= va_arg(args
, unsigned int);
498 num
= va_arg(args
, int);
500 num
= va_arg(args
, unsigned int);
502 str
= number(str
, end
, num
, base
, field_width
, precision
, flags
);
507 /* don't write out a null byte if the buf size is zero */
516 int sprintf(char * buf
, const char *fmt
, ...)
522 i
=_vsnprintf(buf
,INT_MAX
,fmt
,args
);
531 int _snprintf(char * buf
, size_t cnt
, const char *fmt
, ...)
537 i
=_vsnprintf(buf
,cnt
,fmt
,args
);
546 int vsprintf(char *buf
, const char *fmt
, va_list args
)
548 return _vsnprintf(buf
,INT_MAX
,fmt
,args
);