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glibc/stdio/vfscanf.c
Roland McGrath 1e9dc0393c Mon Mar 20 03:19:23 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu> 
* stdio/vfscanf.c (%n): Use READ_IN - 1, so as not to count the
 	read-ahead character.

	* hurd/dtable.c, hurd/getdport.c, hurd/hurd.h, hurd/hurdexec.c,
	  hurd/hurdinit.c, hurd/hurdprio.c, hurd/hurdsock.c,
	  hurd/ports-get.c, hurd/ports-set.c, hurd/setauth.c,
	  hurd/setuids.c, sysdeps/mach/hurd/i386/trampoline.c:
	Get anal with unsigned to pacify compiler.
1995-03-20 08:21:38 +00:00

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/* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <ansidecl.h>
#include "../locale/localeinfo.h"
#include <errno.h>
#include <limits.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef __GNUC__
#define HAVE_LONGLONG
#define LONGLONG long long
#else
#define LONGLONG long
#endif
#define inchar() ((c = getc(s)) == EOF ? EOF : (++read_in, c))
#define conv_error() return ((c == EOF || ungetc(c, s)), done)
#define input_error() return (done == 0 ? EOF : done)
#define memory_error() return ((errno = ENOMEM), EOF)
/* Read formatted input from S according to the format string
FORMAT, using the argument list in ARG.
Return the number of assignments made, or -1 for an input error. */
int
DEFUN(__vfscanf, (s, format, arg),
FILE *s AND CONST char *format AND va_list argptr)
{
va_list arg = (va_list) argptr;
register CONST char *f = format;
register char fc; /* Current character of the format. */
register size_t done = 0; /* Assignments done. */
register size_t read_in = 0; /* Chars read in. */
register int c; /* Last char read. */
register int do_assign; /* Whether to do an assignment. */
register int width; /* Maximum field width. */
int group_flag; /* %' modifier flag. */
/* Type modifiers. */
int is_short, is_long, is_long_double;
#ifdef HAVE_LONGLONG
/* We use the `L' modifier for `long long int'. */
#define is_longlong is_long_double
#else
#define is_longlong 0
#endif
int malloc_string; /* Args are char ** to be filled in. */
/* Status for reading F-P nums. */
char got_dot, got_e;
/* If a [...] is a [^...]. */
char not_in;
/* Base for integral numbers. */
int base;
/* Signedness for integral numbers. */
int number_signed;
/* Integral holding variables. */
union
{
long long int q;
unsigned long long int uq;
long int l;
unsigned long int ul;
} num;
/* Character-buffer pointer. */
register char *str, **strptr;
size_t strsize;
/* Workspace. */
char work[200];
char *w; /* Pointer into WORK. */
wchar_t decimal; /* Decimal point character. */
if (!__validfp(s) || !s->__mode.__read || format == NULL)
{
errno = EINVAL;
return EOF;
}
/* Figure out the decimal point character. */
if (mbtowc (&decimal, _NL_CURRENT (LC_NUMERIC, DECIMAL_POINT),
strlen (_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT))) <= 0)
decimal = (wchar_t) *_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT);
c = inchar();
/* Run through the format string. */
while (*f != '\0')
{
unsigned int argpos;
/* Extract the next argument, which is of type TYPE.
For a %N$... spec, this is the Nth argument from the beginning;
otherwise it is the next argument after the state now in ARG. */
#define ARG(type) (argpos == 0 ? va_arg (arg, type) : \
({ unsigned int pos = argpos; \
va_list arg = (va_list) argptr; \
while (--pos > 0) \
(void) va_arg (arg, void *); \
va_arg (arg, type); \
}))
if (!isascii (*f))
{
/* Non-ASCII, may be a multibyte. */
int len = mblen (f, strlen(f));
if (len > 0)
{
while (len-- > 0)
if (c == EOF)
input_error();
else if (c == *f++)
(void) inchar();
else
conv_error();
continue;
}
}
fc = *f++;
if (fc != '%')
{
/* Characters other than format specs must just match. */
if (c == EOF)
input_error();
if (isspace(fc))
{
/* Whitespace characters match any amount of whitespace. */
while (isspace (c))
inchar ();
continue;
}
else if (c == fc)
(void) inchar();
else
conv_error();
continue;
}
/* Initialize state of modifiers. */
argpos = 0;
do_assign = 1;
group_flag = 0;
is_short = is_long = is_long_double = malloc_string = 0;
/* Check for a positional parameter specification. */
if (isdigit (*f))
{
argpos = *f++ - '0';
while (isdigit (*f))
argpos = argpos * 10 + (*f++ - '0');
if (*f == '$')
++f;
else
{
/* Oops; that was actually the field width. */
width = argpos;
argpos = 0;
goto got_width;
}
}
/* Check for the assignment-suppressant and the number grouping flag. */
while (*f == '*' || *f == '\'')
switch (*f++)
{
case '*':
do_assign = 0;
break;
case '\'':
group_flag = 1;
break;
}
/* Find the maximum field width. */
width = 0;
while (isdigit(*f))
{
width *= 10;
width += *f++ - '0';
}
got_width:
if (width == 0)
width = -1;
/* Check for type modifiers. */
while (*f == 'h' || *f == 'l' || *f == 'L' || *f == 'a' || *f == 'q')
switch (*f++)
{
case 'h':
/* int's are short int's. */
is_short = 1;
break;
case 'l':
if (is_long)
/* A double `l' is equivalent to an `L'. */
is_longlong = 1;
else
/* int's are long int's. */
is_long = 1;
break;
case 'q':
case 'L':
/* double's are long double's, and int's are long long int's. */
is_long_double = 1;
break;
case 'a':
/* String conversions (%s, %[) take a `char **'
arg and fill it in with a malloc'd pointer. */
malloc_string = 1;
break;
}
/* End of the format string? */
if (*f == '\0')
conv_error();
/* Find the conversion specifier. */
w = work;
fc = *f++;
if (fc != '[' && fc != 'c' && fc != 'n')
/* Eat whitespace. */
while (isspace(c))
(void) inchar();
switch (fc)
{
case '%': /* Must match a literal '%'. */
if (c != fc)
conv_error();
break;
case 'n': /* Answer number of assignments done. */
if (do_assign)
*ARG (int *) = read_in - 1; /* Don't count the read-ahead. */
break;
case 'c': /* Match characters. */
if (do_assign)
{
str = ARG (char *);
if (str == NULL)
conv_error ();
}
if (c == EOF)
input_error();
if (width == -1)
width = 1;
if (do_assign)
{
do
*str++ = c;
while (inchar() != EOF && --width > 0);
}
else
while (inchar() != EOF && --width > 0);
if (do_assign)
++done;
break;
case 's': /* Read a string. */
#define STRING_ARG \
if (do_assign) \
{ \
if (malloc_string) \
{ \
/* The string is to be stored in a malloc'd buffer. */ \
strptr = ARG (char **); \
if (strptr == NULL) \
conv_error (); \
/* Allocate an initial buffer. */ \
strsize = 100; \
*strptr = str = malloc (strsize); \
} \
else \
str = ARG (char *); \
if (str == NULL) \
conv_error (); \
}
STRING_ARG;
if (c == EOF)
input_error ();
do
{
if (isspace (c))
break;
#define STRING_ADD_CHAR(c) \
if (do_assign) \
{ \
*str++ = c; \
if (malloc_string && str == *strptr + strsize) \
{ \
/* Enlarge the buffer. */ \
str = realloc (*strptr, strsize * 2); \
if (str == NULL) \
{ \
/* Can't allocate that much. Last-ditch effort. */\
str = realloc (*strptr, strsize + 1); \
if (str == NULL) \
{ \
/* We lose. Oh well. \
Terminate the string and stop converting, \
so at least we don't swallow any input. */ \
(*strptr)[strsize] = '\0'; \
++done; \
conv_error (); \
} \
else \
{ \
*strptr = str; \
str += strsize; \
++strsize; \
} \
} \
else \
{ \
*strptr = str; \
str += strsize; \
strsize *= 2; \
} \
} \
}
STRING_ADD_CHAR (c);
} while (inchar () != EOF && (width <= 0 || --width > 0));
if (do_assign)
{
*str = '\0';
++done;
}
break;
case 'x': /* Hexadecimal integer. */
case 'X': /* Ditto. */
base = 16;
number_signed = 0;
goto number;
case 'o': /* Octal integer. */
base = 8;
number_signed = 0;
goto number;
case 'u': /* Unsigned decimal integer. */
base = 10;
number_signed = 0;
goto number;
case 'd': /* Signed decimal integer. */
base = 10;
number_signed = 1;
goto number;
case 'i': /* Generic number. */
base = 0;
number_signed = 1;
number:
if (c == EOF)
input_error();
/* Check for a sign. */
if (c == '-' || c == '+')
{
*w++ = c;
if (width > 0)
--width;
(void) inchar();
}
/* Look for a leading indication of base. */
if (c == '0')
{
if (width > 0)
--width;
*w++ = '0';
(void) inchar();
if (tolower(c) == 'x')
{
if (base == 0)
base = 16;
if (base == 16)
{
if (width > 0)
--width;
(void) inchar();
}
}
else if (base == 0)
base = 8;
}
if (base == 0)
base = 10;
/* Read the number into WORK. */
do
{
if (base == 16 ? !isxdigit(c) :
(!isdigit(c) || c - '0' >= base))
break;
*w++ = c;
if (width > 0)
--width;
} while (inchar() != EOF && width != 0);
if (w == work ||
(w - work == 1 && (work[0] == '+' || work[0] == '-')))
/* There was on number. */
conv_error();
/* Convert the number. */
*w = '\0';
if (is_longlong)
{
if (number_signed)
num.q = __strtoq_internal (work, &w, base, group_flag);
else
num.uq = __strtouq_internal (work, &w, base, group_flag);
}
else
{
if (number_signed)
num.l = __strtol_internal (work, &w, base, group_flag);
else
num.ul = __strtoul_internal (work, &w, base, group_flag);
}
if (w == work)
conv_error ();
if (do_assign)
{
if (! number_signed)
{
if (is_longlong)
*ARG (unsigned LONGLONG int *) = num.uq;
else if (is_long)
*ARG (unsigned long int *) = num.ul;
else if (is_short)
*ARG (unsigned short int *)
= (unsigned short int) num.ul;
else
*ARG (unsigned int *) = (unsigned int) num.ul;
}
else
{
if (is_longlong)
*ARG (LONGLONG int *) = num.q;
else if (is_long)
*ARG (long int *) = num.l;
else if (is_short)
*ARG (short int *) = (short int) num.l;
else
*ARG (int *) = (int) num.l;
}
++done;
}
break;
case 'e': /* Floating-point numbers. */
case 'E':
case 'f':
case 'g':
case 'G':
if (c == EOF)
input_error();
/* Check for a sign. */
if (c == '-' || c == '+')
{
*w++ = c;
if (inchar() == EOF)
/* EOF is only an input error before we read any chars. */
conv_error();
if (width > 0)
--width;
}
got_dot = got_e = 0;
do
{
if (isdigit(c))
*w++ = c;
else if (got_e && w[-1] == 'e' && (c == '-' || c == '+'))
*w++ = c;
else if (!got_e && tolower(c) == 'e')
{
*w++ = 'e';
got_e = got_dot = 1;
}
else if (c == decimal && !got_dot)
{
*w++ = c;
got_dot = 1;
}
else
break;
if (width > 0)
--width;
} while (inchar() != EOF && width != 0);
if (w == work)
conv_error();
if (w[-1] == '-' || w[-1] == '+' || w[-1] == 'e')
conv_error();
/* Convert the number. */
*w = '\0';
if (is_long_double)
{
long double d = __strtold_internal (work, &w, group_flag);
if (do_assign && w != work)
*ARG (long double *) = d;
}
else if (is_long)
{
double d = __strtod_internal (work, &w, group_flag);
if (do_assign && w != work)
*ARG (double *) = d;
}
else
{
float d = __strtof_internal (work, &w, group_flag);
if (do_assign && w != work)
*ARG (float *) = d;
}
if (w == work)
conv_error ();
if (do_assign)
++done;
break;
case '[': /* Character class. */
STRING_ARG;
if (c == EOF)
input_error();
if (*f == '^')
{
++f;
not_in = 1;
}
else
not_in = 0;
while ((fc = *f++) != '\0' && fc != ']')
{
if (fc == '-' && *f != '\0' && *f != ']' &&
w > work && w[-1] <= *f)
/* Add all characters from the one before the '-'
up to (but not including) the next format char. */
for (fc = w[-1] + 1; fc < *f; ++fc)
*w++ = fc;
else
/* Add the character to the list. */
*w++ = fc;
}
if (fc == '\0')
conv_error();
*w = '\0';
num.ul = read_in;
do
{
if ((strchr (work, c) == NULL) != not_in)
break;
STRING_ADD_CHAR (c);
if (width > 0)
--width;
} while (inchar () != EOF && width != 0);
if (read_in == num.ul)
conv_error ();
if (do_assign)
{
*str = '\0';
++done;
}
break;
case 'p': /* Generic pointer. */
base = 16;
/* A PTR must be the same size as a `long int'. */
is_long = 1;
goto number;
}
}
conv_error();
}
weak_alias (__vfscanf, vfscanf)
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