1 /* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
20 #include "../locale/localeinfo.h"
32 #define LONGLONG long long
37 /* Those are flags in the conversion format. */
38 # define LONG 0x001 /* l: long or double */
39 # define LONGDBL 0x002 /* L: long long or long double */
40 # define SHORT 0x004 /* h: short */
41 # define SUPPRESS 0x008 /* *: suppress assignment */
42 # define POINTER 0x010 /* weird %p pointer (`fake hex') */
43 # define NOSKIP 0x020 /* do not skip blanks */
44 # define WIDTH 0x040 /* width was given */
45 # define GROUP 0x080 /* ': group numbers */
46 # define MALLOC 0x100 /* a: malloc strings */
48 # define TYPEMOD (LONG|LONGDBL|SHORT)
55 # define va_list _IO_va_list
56 # define ungetc(c, s) _IO_ungetc (c, s)
57 # define inchar() ((c = _IO_getc (s)), (void) ++read_in, c)
58 # define conv_error() return ((void) (errp != NULL && (*errp |= 2)), \
59 (void) (c == EOF || _IO_ungetc (c, s)), done)
61 # define input_error() return ((void) (errp != NULL && (*errp |= 1)), \
62 done == 0 ? EOF : done)
63 # define memory_error() return ((void) (errno = ENOMEM), EOF)
64 # define ARGCHECK(s, format) \
67 /* Check file argument for consistence. */ \
69 if (s->_flags & _IO_NO_READS || format == NULL) \
76 # define inchar() ((c = getc (s)), (void) ++read_in, c)
77 # define conv_error() return ((void) ungetc (c, s), done)
78 # define input_error() return (done == 0 ? EOF : done)
79 # define memory_error() return ((void) (errno = ENOMEM), EOF)
80 # define ARGCHECK(s, format) \
83 /* Check file argument for consistence. */ \
84 if (!__validfp (s) || !s->__mode.__read || format == NULL) \
93 /* Read formatted input from S according to the format string
94 FORMAT, using the argument list in ARG.
95 Return the number of assignments made, or -1 for an input error. */
98 _IO_vfscanf (s
, format
, argptr
, errp
)
105 __vfscanf (FILE *s
, const char *format
, va_list argptr
)
108 va_list arg
= (va_list) argptr
;
110 register const char *f
= format
;
111 register unsigned char fc
; /* Current character of the format. */
112 register size_t done
= 0; /* Assignments done. */
113 register size_t read_in
= 0; /* Chars read in. */
114 register int c
; /* Last char read. */
115 register int width
; /* Maximum field width. */
116 register int flags
; /* Modifiers for current format element. */
118 /* Status for reading F-P nums. */
119 char got_dot
, got_e
, negative
;
120 /* If a [...] is a [^...]. */
122 /* Base for integral numbers. */
124 /* Signedness for integral numbers. */
126 /* Decimal point character. */
128 /* The thousands character of the current locale. */
130 /* Integral holding variables. */
134 unsigned long long int uq
;
136 unsigned long int ul
;
138 /* Character-buffer pointer. */
139 register char *str
, **strptr
;
141 /* We must not react on white spaces immediately because they can
142 possibly be matched even if in the input stream no character is
143 available anymore. */
146 char *tw
; /* Temporary pointer. */
147 char *wp
= NULL
; /* Workspace. */
148 size_t wpmax
= 0; /* Maximal size of workspace. */
149 size_t wpsize
; /* Currently used bytes in workspace. */
153 if (wpsize == wpmax) \
156 wpmax = UCHAR_MAX > 2 * wpmax ? UCHAR_MAX : 2 * wpmax; \
157 wp = (char *) alloca (wpmax); \
159 memcpy (wp, old, wpsize); \
161 wp[wpsize++] = (Ch); \
165 ARGCHECK (s
, format
);
167 /* Figure out the decimal point character. */
168 if (mbtowc (&decimal
, _NL_CURRENT (LC_NUMERIC
, DECIMAL_POINT
),
169 strlen (_NL_CURRENT (LC_NUMERIC
, DECIMAL_POINT
))) <= 0)
170 decimal
= (wchar_t) *_NL_CURRENT (LC_NUMERIC
, DECIMAL_POINT
);
171 /* Figure out the thousands separator character. */
172 if (mbtowc (&thousands
, _NL_CURRENT (LC_NUMERIC
, THOUSANDS_SEP
),
173 strlen (_NL_CURRENT (LC_NUMERIC
, THOUSANDS_SEP
))) <= 0)
174 thousands
= (wchar_t) *_NL_CURRENT (LC_NUMERIC
, THOUSANDS_SEP
);
178 /* Run through the format string. */
182 /* Extract the next argument, which is of type TYPE.
183 For a %N$... spec, this is the Nth argument from the beginning;
184 otherwise it is the next argument after the state now in ARG. */
186 /* XXX Possible optimization. */
187 # define ARG(type) (argpos == 0 ? va_arg (arg, type) : \
188 ({ va_list arg = (va_list) argptr; \
189 arg = (va_list) ((char *) arg \
191 * __va_rounded_size (void *)); \
192 va_arg (arg, type); \
195 # define ARG(type) (argpos == 0 ? va_arg (arg, type) : \
196 ({ unsigned int pos = argpos; \
197 va_list arg = (va_list) argptr; \
199 (void) va_arg (arg, void *); \
200 va_arg (arg, type); \
206 /* Non-ASCII, may be a multibyte. */
207 int len
= mblen (f
, strlen (f
));
224 /* Remember to skip spaces. */
231 /* Characters other than format specs must just match. */
235 /* We saw white space char as the last character in the format
236 string. Now it's time to skip all leading white space. */
252 /* This is the start of the conversion string. */
255 /* Initialize state of modifiers. */
258 /* Prepare temporary buffer. */
261 /* Check for a positional parameter specification. */
266 argpos
= argpos
* 10 + (*f
++ - '0');
271 /* Oops; that was actually the field width. */
279 /* Check for the assignment-suppressant and the number grouping flag. */
280 while (*f
== '*' || *f
== '\'')
291 /* We have seen width. */
295 /* Find the maximum field width. */
306 /* Check for type modifiers. */
307 while (*f
== 'h' || *f
== 'l' || *f
== 'L' || *f
== 'a' || *f
== 'q')
311 /* int's are short int's. */
313 /* Signal illegal format element. */
318 if (flags
& (SHORT
|LONGDBL
))
320 else if (flags
& LONG
)
322 /* A double `l' is equivalent to an `L'. */
327 /* int's are long int's. */
332 /* double's are long double's, and int's are long long int's. */
334 /* Signal illegal format element. */
340 /* Signal illegal format element. */
342 /* String conversions (%s, %[) take a `char **'
343 arg and fill it in with a malloc'd pointer. */
348 /* End of the format string? */
352 /* Find the conversion specifier. */
354 if (skip_space
|| (fc
!= '[' && fc
!= 'c' && fc
!= 'n'))
356 /* Eat whitespace. */
364 case '%': /* Must match a literal '%'. */
370 case 'n': /* Answer number of assignments done. */
371 /* Corrigendum 1 to ISO C 1990 describes the allowed flags
372 with the 'n' conversion specifier. */
373 if (!(flags
& SUPPRESS
))
374 /* Don't count the read-ahead. */
376 *ARG (long long int *) = read_in
- 1;
377 else if (flags
& LONG
)
378 *ARG (long int *) = read_in
- 1;
379 else if (flags
& SHORT
)
380 *ARG (short int *) = read_in
- 1;
382 *ARG (int *) = read_in
- 1;
385 case 'c': /* Match characters. */
386 if (!(flags
& SUPPRESS
))
399 if (!(flags
& SUPPRESS
))
403 while (inchar () != EOF
&& --width
> 0);
406 while (inchar () != EOF
&& --width
> 0);
408 if (!(flags
& SUPPRESS
))
413 case 's': /* Read a string. */
415 if (!(flags & SUPPRESS)) \
417 if (flags & MALLOC) \
419 /* The string is to be stored in a malloc'd buffer. */ \
420 strptr = ARG (char **); \
421 if (strptr == NULL) \
423 /* Allocate an initial buffer. */ \
425 *strptr = str = malloc (strsize); \
428 str = ARG (char *); \
441 #define STRING_ADD_CHAR(c) \
442 if (!(flags & SUPPRESS)) \
445 if ((flags & MALLOC) && str == *strptr + strsize) \
447 /* Enlarge the buffer. */ \
448 str = realloc (*strptr, strsize * 2); \
451 /* Can't allocate that much. Last-ditch effort. */\
452 str = realloc (*strptr, strsize + 1); \
455 /* We lose. Oh well. \
456 Terminate the string and stop converting, \
457 so at least we don't skip any input. */ \
458 (*strptr)[strsize] = '\0'; \
478 } while (inchar () != EOF
&& (width
<= 0 || --width
> 0));
480 if (!(flags
& SUPPRESS
))
487 case 'x': /* Hexadecimal integer. */
488 case 'X': /* Ditto. */
493 case 'o': /* Octal integer. */
498 case 'u': /* Unsigned decimal integer. */
503 case 'd': /* Signed decimal integer. */
508 case 'i': /* Generic number. */
516 /* Check for a sign. */
517 if (c
== '-' || c
== '+')
525 /* Look for a leading indication of base. */
526 if (width
!= 0 && c
== '0')
534 if (width
!= 0 && tolower (c
) == 'x')
552 /* Read the number into workspace. */
553 while (c
!= EOF
&& width
!= 0)
555 if (base
== 16 ? !isxdigit (c
) :
556 ((!isdigit (c
) || c
- '0' >= base
) &&
557 !((flags
& GROUP
) && base
== 10 && c
== thousands
)))
567 (wpsize
== 1 && (wp
[0] == '+' || wp
[0] == '-')))
568 /* There was no number. */
571 /* Convert the number. */
576 num
.q
= __strtoq_internal (wp
, &tw
, base
, flags
& GROUP
);
578 num
.uq
= __strtouq_internal (wp
, &tw
, base
, flags
& GROUP
);
583 num
.l
= __strtol_internal (wp
, &tw
, base
, flags
& GROUP
);
585 num
.ul
= __strtoul_internal (wp
, &tw
, base
, flags
& GROUP
);
590 if (!(flags
& SUPPRESS
))
595 *ARG (unsigned LONGLONG
int *) = num
.uq
;
596 else if (flags
& LONG
)
597 *ARG (unsigned long int *) = num
.ul
;
598 else if (flags
& SHORT
)
599 *ARG (unsigned short int *)
600 = (unsigned short int) num
.ul
;
602 *ARG (unsigned int *) = (unsigned int) num
.ul
;
607 *ARG (LONGLONG
int *) = num
.q
;
608 else if (flags
& LONG
)
609 *ARG (long int *) = num
.l
;
610 else if (flags
& SHORT
)
611 *ARG (short int *) = (short int) num
.l
;
613 *ARG (int *) = (int) num
.l
;
619 case 'e': /* Floating-point numbers. */
627 /* Check for a sign. */
628 if (c
== '-' || c
== '+')
631 if (inchar () == EOF
)
632 /* EOF is only an input error before we read any chars. */
645 else if (got_e
&& wp
[wpsize
- 1] == 'e'
646 && (c
== '-' || c
== '+'))
648 else if (wpsize
> 0 && !got_e
&& tolower (c
) == 'e')
653 else if (c
== decimal
&& !got_dot
)
658 else if ((flags
& GROUP
) && c
== thousands
&& !got_dot
)
665 while (inchar () != EOF
&& width
!= 0);
670 /* Convert the number. */
674 long double d
= __strtold_internal (wp
, &tw
, flags
& GROUP
);
675 if (!(flags
& SUPPRESS
) && tw
!= wp
)
676 *ARG (long double *) = negative
? -d
: d
;
678 else if (flags
& LONG
)
680 double d
= __strtod_internal (wp
, &tw
, flags
& GROUP
);
681 if (!(flags
& SUPPRESS
) && tw
!= wp
)
682 *ARG (double *) = negative
? -d
: d
;
686 float d
= __strtof_internal (wp
, &tw
, flags
& GROUP
);
687 if (!(flags
& SUPPRESS
) && tw
!= wp
)
688 *ARG (float *) = negative
? -d
: d
;
694 if (!(flags
& SUPPRESS
))
698 case '[': /* Character class. */
712 /* Fill WP with byte flags indexed by character.
713 We will use this flag map for matching input characters. */
714 if (wpmax
< UCHAR_MAX
)
717 wp
= (char *) alloca (wpmax
);
719 memset (wp
, 0, UCHAR_MAX
);
722 if (fc
== ']' || fc
== '-')
724 /* If ] or - appears before any char in the set, it is not
725 the terminator or separator, but the first char in the
731 while ((fc
= *f
++) != '\0' && fc
!= ']')
733 if (fc
== '-' && *f
!= '\0' && *f
!= ']' &&
734 (unsigned char) f
[-2] <= (unsigned char) *f
)
736 /* Add all characters from the one before the '-'
737 up to (but not including) the next format char. */
738 for (fc
= f
[-2]; fc
< *f
; ++fc
)
742 /* Add the character to the flag map. */
757 while (inchar () != EOF
&& width
!= 0);
758 if (read_in
== num
.ul
)
761 if (!(flags
& SUPPRESS
))
768 case 'p': /* Generic pointer. */
770 /* A PTR must be the same size as a `long int'. */
771 flags
&= ~(SHORT
|LONGDBL
);
778 /* The last thing we saw int the format string was a white space.
779 Consume the last white spaces. */
784 return ((void) (c
== EOF
|| ungetc (c
, s
)), done
);
789 __vfscanf (FILE *s
, const char *format
, va_list argptr
)
791 return _IO_vfscanf (s
, format
, argptr
, NULL
);
795 weak_alias (__vfscanf
, vfscanf
)