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glibc/stdio-common/vfprintf.c
Roland McGrath f797c38303 * stdio-common/vfprintf.c (%c): Count the character itself towards 
the field width in all cases.
1995-11-06 10:00:20 +00:00

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24 KiB
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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 <ctype.h>
#include <errno.h>
#include <float.h>
#include <limits.h>
#include <math.h>
#include <printf.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <printf.h>
#include <stddef.h>
#include "_itoa.h"
#include "../locale/localeinfo.h"
/* Include the shared code for parsing the format string. */
#include "printf-parse.h"
/* This function from the GNU C library is also used in libio.
To compile for use in libio, compile with -DUSE_IN_LIBIO. */
#ifdef USE_IN_LIBIO
/* This code is for use in libio. */
#include <libioP.h>
#define PUT(f, s, n) _IO_sputn (f, s, n)
#define PAD(padchar) \
if (specs[cnt].info.width > 0) \
done += _IO_padn (s, padchar, specs[cnt].info.width)
#define PUTC(c, f) _IO_putc (c, f)
#define vfprintf _IO_vfprintf
#define size_t _IO_size_t
#define FILE _IO_FILE
#define va_list _IO_va_list
#undef BUFSIZ
#define BUFSIZ _IO_BUFSIZ
#define ARGCHECK(s, format) \
do \
{ \
/* Check file argument for consistence. */ \
CHECK_FILE (s, -1); \
if (s->_flags & _IO_NO_WRITES || format == NULL) \
{ \
MAYBE_SET_EINVAL; \
return -1; \
} \
} while (0)
#define UNBUFFERED_P(s) ((s)->_IO_file_flags & _IO_UNBUFFERED)
#else /* ! USE_IN_LIBIO */
/* This code is for use in the GNU C library. */
#include <stdio.h>
#define PUTC(c, f) putc (c, f)
#define PUT(f, s, n) fwrite (s, 1, n, f)
ssize_t __printf_pad __P ((FILE *, char pad, size_t n));
#define PAD(padchar) \
if (specs[cnt].info.width > 0) \
{ if (__printf_pad (s, padchar, specs[cnt].info.width) == -1) \
return -1; else done += specs[cnt].info.width; }
#define ARGCHECK(s, format) \
do \
{ \
/* Check file argument for consistence. */ \
if (!__validfp(s) || !s->__mode.__write || format == NULL) \
{ \
errno = EINVAL; \
return -1; \
} \
if (!s->__seen) \
{ \
if (__flshfp (s, EOF) == EOF) \
return -1; \
} \
} while (0)
#define UNBUFFERED_P(s) ((s)->__buffer == NULL)
#endif /* USE_IN_LIBIO */
#define outchar(x) \
do \
{ \
register const int outc = (x); \
if (putc (outc, s) == EOF) \
return -1; \
else \
++done; \
} while (0)
#define outstring(string, len) \
do \
{ \
if (len > 20) \
{ \
if (PUT (s, string, len) != len) \
return -1; \
done += len; \
} \
else \
{ \
register const char *cp = string; \
register int l = len; \
while (l-- > 0) \
outchar (*cp++); \
} \
} while (0)
/* Helper function to provide temporary buffering for unbuffered streams. */
static int buffered_vfprintf __P ((FILE *stream, const char *fmt, va_list));
static printf_function printf_unknown;
extern printf_function **__printf_function_table;
static char *group_number __P ((char *, char *, const char *, wchar_t));
int
vfprintf (s, format, ap)
register FILE *s;
const char *format;
va_list ap;
{
/* The character used as thousands separator. */
wchar_t thousands_sep;
/* The string describing the size of groups of digits. */
const char *grouping;
/* Array with information about the needed arguments. This has to be
dynamically extendable. */
size_t nspecs;
size_t nspecs_max;
struct printf_spec *specs;
/* The number of arguments the format string requests. This will
determine the size of the array needed to store the argument
attributes. */
size_t nargs;
int *args_type;
union printf_arg *args_value;
/* Positional parameters refer to arguments directly. This could also
determine the maximum number of arguments. Track the maximum number. */
size_t max_ref_arg;
/* End of leading constant string. */
const char *lead_str_end;
/* Number of characters written. */
register size_t done = 0;
/* Running pointer through format string. */
const char *f;
/* Just a counter. */
int cnt;
ARGCHECK (s, format);
if (UNBUFFERED_P (s))
/* Use a helper function which will allocate a local temporary buffer
for the stream and then call us again. */
return buffered_vfprintf (s, format, ap);
/* Reset multibyte characters to their initial state. */
(void) mblen ((char *) NULL, 0);
/* Figure out the thousands separator character. */
if (mbtowc (&thousands_sep, _NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP),
strlen (_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP))) <= 0)
thousands_sep = (wchar_t) *_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP);
grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
if (*grouping == '\0' || *grouping == CHAR_MAX || thousands_sep == L'\0')
grouping = NULL;
nspecs_max = 32; /* A more or less arbitrary start value. */
specs = alloca (nspecs_max * sizeof (struct printf_spec));
nspecs = 0;
nargs = 0;
max_ref_arg = 0;
/* Find the first format specifier. */
lead_str_end = find_spec (format);
for (f = lead_str_end; *f != '\0'; f = specs[nspecs++].next_fmt)
{
if (nspecs >= nspecs_max)
{
/* Extend the array of format specifiers. */
struct printf_spec *old = specs;
nspecs_max *= 2;
specs = alloca (nspecs_max * sizeof (struct printf_spec));
if (specs == &old[nspecs])
/* Stack grows up, OLD was the last thing allocated; extend it. */
nspecs_max += nspecs_max / 2;
else
{
/* Copy the old array's elements to the new space. */
memcpy (specs, old, nspecs * sizeof (struct printf_spec));
if (old == &specs[nspecs])
/* Stack grows down, OLD was just below the new SPECS.
We can use that space when the new space runs out. */
nspecs_max += nspecs_max / 2;
}
}
/* Parse the format specifier. */
nargs += parse_one_spec (f, nargs, &specs[nspecs], &max_ref_arg);
}
/* Determine the number of arguments the format string consumes. */
nargs = MAX (nargs, max_ref_arg);
/* Allocate memory for the argument descriptions. */
args_type = alloca (nargs * sizeof (int));
args_value = alloca (nargs * sizeof (union printf_arg));
/* XXX Could do sanity check here:
Initialize args_type elts to zero.
If any is still zero after this loop, format is invalid. */
/* Fill in the types of all the arguments. */
for (cnt = 0; cnt < nspecs; ++cnt)
{
/* If the width is determined by an argument this is an int. */
if (specs[cnt].width_arg != -1)
args_type[specs[cnt].width_arg] = PA_INT;
/* If the precision is determined by an argument this is an int. */
if (specs[cnt].prec_arg != -1)
args_type[specs[cnt].prec_arg] = PA_INT;
switch (specs[cnt].ndata_args)
{
case 0: /* No arguments. */
break;
case 1: /* One argument; we already have the type. */
args_type[specs[cnt].data_arg] = specs[cnt].data_arg_type;
break;
default:
/* We have more than one argument for this format spec. We must
call the arginfo function again to determine all the types. */
(void) (*__printf_arginfo_table[specs[cnt].info.spec])
(&specs[cnt].info,
specs[cnt].ndata_args, &args_type[specs[cnt].data_arg]);
break;
}
}
/* Now we know all the types and the order. Fill in the argument values. */
for (cnt = 0; cnt < nargs; ++cnt)
switch (args_type[cnt])
{
#define T(tag, mem, type) \
case tag: \
args_value[cnt].mem = va_arg (ap, type); \
break
T (PA_CHAR, pa_char, int); /* Promoted. */
T (PA_INT|PA_FLAG_SHORT, pa_short_int, int); /* Promoted. */
T (PA_INT, pa_int, int);
T (PA_INT|PA_FLAG_LONG, pa_long_int, long int);
T (PA_INT|PA_FLAG_LONG_LONG, pa_long_long_int, long long int);
T (PA_FLOAT, pa_float, double); /* Promoted. */
T (PA_DOUBLE, pa_double, double);
T (PA_DOUBLE|PA_FLAG_LONG_DOUBLE, pa_long_double, long double);
T (PA_STRING, pa_string, const char *);
T (PA_POINTER, pa_pointer, void *);
#undef T
default:
if ((args_type[cnt] & PA_FLAG_PTR) != 0)
args_value[cnt].pa_pointer = va_arg (ap, void *);
break;
}
/* Write the literal text before the first format. */
outstring (format, lead_str_end - format);
/* Now walk through all format specifiers and process them. */
for (cnt = 0; cnt < nspecs; ++cnt)
{
printf_function *function; /* Auxiliary function to do output. */
int is_neg; /* Decimal integer is negative. */
int base; /* Base of a number to be written. */
unsigned long long int num; /* Integral number to be written. */
const char *str; /* String to be written. */
char errorbuf[1024]; /* Buffer sometimes used by %m. */
if (specs[cnt].width_arg != -1)
{
/* Extract the field width from an argument. */
specs[cnt].info.width = args_value[specs[cnt].width_arg].pa_int;
if (specs[cnt].info.width < 0)
/* If the width value is negative left justification is selected
and the value is taken as being positive. */
{
specs[cnt].info.width = -specs[cnt].info.width;
specs[cnt].info.left = 1;
}
}
if (specs[cnt].prec_arg != -1)
{
/* Extract the precision from an argument. */
specs[cnt].info.prec = args_value[specs[cnt].prec_arg].pa_int;
if (specs[cnt].info.prec < 0)
/* If the precision is negative the precision is omitted. */
specs[cnt].info.prec = -1;
}
/* Check for a user-defined handler for this spec. */
function = (__printf_function_table == NULL ? NULL :
__printf_function_table[specs[cnt].info.spec]);
if (function != NULL)
use_function: /* Built-in formats with helpers use this. */
{
int function_done;
unsigned int i;
const void *ptr[specs[cnt].ndata_args];
/* Fill in an array of pointers to the argument values. */
for (i = 0; i < specs[cnt].ndata_args; ++i)
ptr[i] = &args_value[specs[cnt].data_arg + i];
/* Call the function. */
function_done = (*function) (s, &specs[cnt].info, ptr);
/* If an error occured don't do any further work. */
if (function_done < 0)
return -1;
done += function_done;
}
else
switch (specs[cnt].info.spec)
{
case '%':
/* Write a literal "%". */
outchar ('%');
break;
case 'i':
case 'd':
{
long long int signed_num;
/* Decimal integer. */
base = 10;
if (specs[cnt].info.is_longlong)
signed_num = args_value[specs[cnt].data_arg].pa_long_long_int;
else if (specs[cnt].info.is_long)
signed_num = args_value[specs[cnt].data_arg].pa_long_int;
else if (!specs[cnt].info.is_short)
signed_num = args_value[specs[cnt].data_arg].pa_int;
else
signed_num = args_value[specs[cnt].data_arg].pa_short_int;
is_neg = signed_num < 0;
num = is_neg ? (- signed_num) : signed_num;
goto number;
}
case 'u':
/* Decimal unsigned integer. */
base = 10;
goto unsigned_number;
case 'o':
/* Octal unsigned integer. */
base = 8;
goto unsigned_number;
case 'X':
/* Hexadecimal unsigned integer. */
case 'x':
/* Hex with lower-case digits. */
base = 16;
unsigned_number:
/* Unsigned number of base BASE. */
if (specs[cnt].info.is_longlong)
num = args_value[specs[cnt].data_arg].pa_u_long_long_int;
else if (specs[cnt].info.is_long)
num = args_value[specs[cnt].data_arg].pa_u_long_int;
else if (!specs[cnt].info.is_short)
num = args_value[specs[cnt].data_arg].pa_u_int;
else
num = args_value[specs[cnt].data_arg].pa_u_short_int;
/* ANSI only specifies the `+' and
` ' flags for signed conversions. */
is_neg = 0;
specs[cnt].info.showsign = 0;
specs[cnt].info.space = 0;
number:
/* Number of base BASE. */
{
char work[BUFSIZ];
char *const workend = &work[sizeof(work) - 1];
register char *w;
/* Supply a default precision if none was given. */
if (specs[cnt].info.prec == -1)
specs[cnt].info.prec = 1;
/* Put the number in WORK. */
w = _itoa (num, workend + 1, base, specs[cnt].info.spec == 'X');
w -= 1;
if (specs[cnt].info.group && grouping)
w = group_number (w, workend, grouping, thousands_sep);
specs[cnt].info.width -= workend - w;
specs[cnt].info.prec -= workend - w;
if (num != 0 && specs[cnt].info.alt && base == 8
&& specs[cnt].info.prec <= 0)
{
/* Add octal marker. */
*w-- = '0';
--specs[cnt].info.width;
}
if (specs[cnt].info.prec > 0)
{
/* Add zeros to the precision. */
specs[cnt].info.width -= specs[cnt].info.prec;
while (specs[cnt].info.prec-- > 0)
*w-- = '0';
}
if (num != 0 && specs[cnt].info.alt && base == 16)
/* Account for 0X hex marker. */
specs[cnt].info.width -= 2;
if (is_neg || specs[cnt].info.showsign || specs[cnt].info.space)
--specs[cnt].info.width;
if (!specs[cnt].info.left && specs[cnt].info.pad == ' ')
PAD (' ');
if (is_neg)
outchar ('-');
else if (specs[cnt].info.showsign)
outchar ('+');
else if (specs[cnt].info.space)
outchar (' ');
if (num != 0 && specs[cnt].info.alt && base == 16)
{
outchar ('0');
outchar (specs[cnt].info.spec);
}
if (!specs[cnt].info.left && specs[cnt].info.pad == '0')
PAD ('0');
/* Write the number. */
while (++w <= workend)
outchar (*w);
if (specs[cnt].info.left)
PAD (' ');
}
break;
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
{
/* Floating-point number. This is handled by printf_fp.c. */
extern printf_function __printf_fp;
function = __printf_fp;
goto use_function;
}
case 'c':
/* Character. */
--specs[cnt].info.width;/* Account for the character itself. */
if (!specs[cnt].info.left)
PAD (' ');
outchar ((unsigned char) args_value[specs[cnt].data_arg].pa_char);
if (specs[cnt].info.left)
PAD (' ');
break;
case 's':
{
static const char null[] = "(null)";
size_t len;
str = args_value[specs[cnt].data_arg].pa_string;
string:
if (str == NULL)
{
/* Write "(null)" if there's space. */
if (specs[cnt].info.prec == -1
|| specs[cnt].info.prec >= (int) sizeof (null) - 1)
{
str = null;
len = sizeof (null) - 1;
}
else
{
str = "";
len = 0;
}
}
else if (specs[cnt].info.prec != -1)
{
/* Search for the end of the string, but don't search
past the length specified by the precision. */
const char *end = memchr (str, '\0', specs[cnt].info.prec);
if (end)
len = end - str;
else
len = specs[cnt].info.prec;
}
else
len = strlen (str);
specs[cnt].info.width -= len;
if (!specs[cnt].info.left)
PAD (' ');
outstring (str, len);
if (specs[cnt].info.left)
PAD (' ');
}
break;
case 'p':
/* Generic pointer. */
{
const void *ptr;
ptr = args_value[specs[cnt].data_arg].pa_pointer;
if (ptr != NULL)
{
/* If the pointer is not NULL, write it as a %#x spec. */
base = 16;
num = (unsigned long long int) (unsigned long int) ptr;
is_neg = 0;
specs[cnt].info.alt = 1;
specs[cnt].info.spec = 'x';
specs[cnt].info.group = 0;
goto number;
}
else
{
/* Write "(nil)" for a nil pointer. */
str = "(nil)";
/* Make sure the full string "(nil)" is printed. */
if (specs[cnt].info.prec < 5)
specs[cnt].info.prec = 5;
goto string;
}
}
break;
case 'n':
/* Answer the count of characters written. */
if (specs[cnt].info.is_longlong)
*(long long int *)
args_value[specs[cnt].data_arg].pa_pointer = done;
else if (specs[cnt].info.is_long)
*(long int *)
args_value[specs[cnt].data_arg].pa_pointer = done;
else if (!specs[cnt].info.is_short)
*(int *)
args_value[specs[cnt].data_arg].pa_pointer = done;
else
*(short int *)
args_value[specs[cnt].data_arg].pa_pointer = done;
break;
case 'm':
{
extern char *_strerror_internal __P ((int, char *buf, size_t));
str = _strerror_internal (errno, errorbuf, sizeof errorbuf);
goto string;
}
default:
/* Unrecognized format specifier. */
function = printf_unknown;
goto use_function;
}
/* Write the following constant string. */
outstring (specs[cnt].end_of_fmt,
specs[cnt].next_fmt - specs[cnt].end_of_fmt);
}
return done;
}
/* Handle an unknown format specifier. This prints out a canonicalized
representation of the format spec itself. */
static int
printf_unknown (s, info, args)
FILE *s;
const struct printf_info *info;
const void **const args;
{
int done = 0;
char work[BUFSIZ];
char *const workend = &work[sizeof(work) - 1];
register char *w;
outchar ('%');
if (info->alt)
outchar ('#');
if (info->group)
outchar ('\'');
if (info->showsign)
outchar ('+');
else if (info->space)
outchar (' ');
if (info->left)
outchar ('-');
if (info->pad == '0')
outchar ('0');
if (info->width != 0)
{
w = _itoa (info->width, workend + 1, 10, 0);
while (++w <= workend)
outchar (*w);
}
if (info->prec != -1)
{
outchar ('.');
w = _itoa (info->prec, workend + 1, 10, 0);
while (++w <= workend)
outchar (*w);
}
if (info->spec != '\0')
outchar (info->spec);
return done;
}
/* Group the digits according to the grouping rules of the current locale.
The interpretation of GROUPING is as in `struct lconv' from <locale.h>. */
static char *
group_number (char *w, char *workend, const char *grouping,
wchar_t thousands_sep)
{
int len;
char *src, *s;
/* We treat all negative values like CHAR_MAX. */
if (*grouping == CHAR_MAX || *grouping < 0)
/* No grouping should be done. */
return w;
len = *grouping;
/* Copy existing string so that nothing gets overwritten. */
src = (char *) alloca (workend - w);
memcpy (src, w + 1, workend - w);
s = &src[workend - w - 1];
w = workend;
/* Process all characters in the string. */
while (s >= src)
{
*w-- = *s--;
if (--len == 0 && s >= src)
{
/* A new group begins. */
*w-- = thousands_sep;
len = *grouping++;
if (*grouping == '\0')
/* The previous grouping repeats ad infinitum. */
--grouping;
else if (*grouping == CHAR_MAX || *grouping < 0)
{
/* No further grouping to be done.
Copy the rest of the number. */
do
*w-- = *s--;
while (s >= src);
break;
}
}
}
return w;
}
#ifdef USE_IN_LIBIO
/* Helper "class" for `fprintf to unbuffered': creates a temporary buffer. */
struct helper_file
{
struct _IO_FILE_plus _f;
_IO_FILE *_put_stream;
};
static int
_IO_helper_overflow (s, c)
_IO_FILE *s;
int c;
{
_IO_FILE *target = ((struct helper_file*) s)->_put_stream;
int used = s->_IO_write_ptr - s->_IO_write_base;
if (used)
{
_IO_size_t written = _IO_sputn (target, s->_IO_write_base, used);
s->_IO_write_ptr -= written;
}
return _IO_putc (c, s);
}
static const struct _IO_jump_t _IO_helper_jumps =
{
_IO_helper_overflow,
_IO_default_underflow,
_IO_default_xsputn,
_IO_default_xsgetn,
_IO_default_read,
_IO_default_write,
_IO_default_doallocate,
_IO_default_pbackfail,
_IO_default_setbuf,
_IO_default_sync,
_IO_default_finish,
_IO_default_close,
_IO_default_stat,
_IO_default_seek,
_IO_default_seekoff,
_IO_default_seekpos,
_IO_default_uflow
};
static int
buffered_vfprintf (s, format, args)
register _IO_FILE *s;
char const *format;
_IO_va_list args;
{
char buf[_IO_BUFSIZ];
struct helper_file helper;
register _IO_FILE *hp = (_IO_FILE *) &helper;
int result, to_flush;
/* Initialize helper. */
helper._put_stream = s;
hp->_IO_write_base = buf;
hp->_IO_write_ptr = buf;
hp->_IO_write_end = buf + sizeof buf;
hp->_IO_file_flags = _IO_MAGIC|_IO_NO_READS;
hp->_jumps = (struct _IO_jump_t *) &_IO_helper_jumps;
/* Now print to helper instead. */
result = _IO_vfprintf (hp, format, args);
/* Now flush anything from the helper to the S. */
if ((to_flush = hp->_IO_write_ptr - hp->_IO_write_base) > 0)
{
if (_IO_sputn (s, hp->_IO_write_base, to_flush) != to_flush)
return -1;
}
return result;
}
#else /* !USE_IN_LIBIO */
static int
buffered_vfprintf (s, format, args)
register FILE *s;
char const *format;
va_list args;
{
char buf[BUFSIZ];
int result;
s->__bufp = s->__buffer = buf;
s->__bufsize = sizeof buf;
s->__put_limit = s->__buffer + s->__bufsize;
s->__get_limit = s->__buffer;
/* Now use buffer to print. */
result = vfprintf (s, format, args);
if (fflush (s) == EOF)
result = -1;
s->__buffer = s->__bufp = s->__get_limit = s->__put_limit = NULL;
s->__bufsize = 0;
return result;
}
/* Pads string with given number of a specified character.
This code is taken from iopadn.c of the GNU I/O library. */
#define PADSIZE 16
static const char blanks[PADSIZE] =
{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
static const char zeroes[PADSIZE] =
{'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
ssize_t
__printf_pad (s, pad, count)
FILE *s;
char pad;
size_t count;
{
const char *padptr;
register size_t i;
padptr = pad == ' ' ? blanks : zeroes;
for (i = count; i >= PADSIZE; i -= PADSIZE)
if (PUT (s, padptr, PADSIZE) != PADSIZE)
return -1;
if (i > 0)
if (PUT (s, padptr, i) != i)
return -1;
return count;
}
#undef PADSIZE
#endif /* USE_IN_LIBIO */
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