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gnupg/common/estream-printf.c
Werner Koch 64c8f1777c Update estream.
2009-09-03 10:44:13 +00:00

1789 lines
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/* estream-printf.c - Versatile C-99 compliant printf formatting
* Copyright (C) 2007, 2008, 2009 g10 Code GmbH
*
* This file is part of Libestream.
*
* Libestream is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License,
* or (at your option) any later version.
*
* Libestream 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Libestream; if not, see <http://www.gnu.org/licenses/>.
*/
/* Required autoconf tests:
AC_TYPE_LONG_LONG_INT defines HAVE_LONG_LONG_INT
AC_TYPE_LONG_DOUBLE defines HAVE_LONG_DOUBLE
AC_TYPE_INTMAX_T defines HAVE_INTMAX_T
AC_TYPE_UINTMAX_T defines HAVE_UINTMAX_T
AC_CHECK_TYPES([ptrdiff_t]) defines HAVE_PTRDIFF_T
AC_CHECK_SIZEOF([unsigned long]) defines SIZEOF_UNSIGNED_LONG
AC_CHECK_SIZEOF([void *]) defines SIZEOF_VOID_P
HAVE_LANGINFO_THOUSANDS_SEP
Note that the file estream.m4 provides the autoconf macro
ESTREAM_PRINTF_INIT which runs all required checks.
See estream-printf.h for ways to tune this code.
Missing stuff: wchar and wint_t
thousands_sep in pr_float.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#include <errno.h>
#include <stddef.h>
#include <assert.h>
#if defined(HAVE_INTMAX_T) || defined(HAVE_UINTMAX_T)
# ifdef HAVE_STDINT_H
# include <stdint.h>
# endif
#endif
#ifdef HAVE_LANGINFO_THOUSANDS_SEP
#include <langinfo.h>
#endif
#ifdef _ESTREAM_PRINTF_EXTRA_INCLUDE
# include _ESTREAM_PRINTF_EXTRA_INCLUDE
#endif
#include "estream-printf.h"
/* #define DEBUG 1 */
/* Allow redefinition of asprintf used malloc functions. */
#if defined(_ESTREAM_PRINTF_MALLOC)
#define my_printf_malloc(a) _ESTREAM_PRINTF_MALLOC((a))
#else
#define my_printf_malloc(a) malloc((a))
#endif
#if defined(_ESTREAM_PRINTF_FREE)
#define my_printf_free(a) _ESTREAM_PRINTF_FREE((a))
#else
#define my_printf_free(a) free((a))
#endif
/* Calculate array dimension. */
#ifndef DIM
#define DIM(array) (sizeof (array) / sizeof (*array))
#endif
/* We allow for that many args without requiring malloced memory. */
#define DEFAULT_MAX_ARGSPECS 5
/* We allow for that many values without requiring malloced memory. */
#define DEFAULT_MAX_VALUES 8
/* We allocate this many new array argspec elements each time. */
#define ARGSPECS_BUMP_VALUE 10
/* Special values for the field width and the precision. */
#define NO_FIELD_VALUE (-1)
#define STAR_FIELD_VALUE (-2)
/* Bit valuues used for the conversion flags. */
#define FLAG_GROUPING 1
#define FLAG_LEFT_JUST 2
#define FLAG_PLUS_SIGN 4
#define FLAG_SPACE_PLUS 8
#define FLAG_ALT_CONV 16
#define FLAG_ZERO_PAD 32
/* Constants used the length modifiers. */
typedef enum
{
LENMOD_NONE = 0,
LENMOD_CHAR, /* "hh" */
LENMOD_SHORT, /* "h" */
LENMOD_LONG, /* "l" */
LENMOD_LONGLONG, /* "ll" */
LENMOD_INTMAX, /* "j" */
LENMOD_SIZET, /* "z" */
LENMOD_PTRDIFF, /* "t" */
LENMOD_LONGDBL /* "L" */
} lenmod_t;
/* All the conversion specifiers. */
typedef enum
{
CONSPEC_UNKNOWN = 0,
CONSPEC_DECIMAL,
CONSPEC_OCTAL,
CONSPEC_UNSIGNED,
CONSPEC_HEX,
CONSPEC_HEX_UP,
CONSPEC_FLOAT,
CONSPEC_FLOAT_UP,
CONSPEC_EXP,
CONSPEC_EXP_UP,
CONSPEC_F_OR_G,
CONSPEC_F_OR_G_UP,
CONSPEC_HEX_EXP,
CONSPEC_HEX_EXP_UP,
CONSPEC_CHAR,
CONSPEC_STRING,
CONSPEC_POINTER,
CONSPEC_STRERROR,
CONSPEC_BYTES_SO_FAR
} conspec_t;
/* Constants describing all the suppoorted types. Note that we list
all the types we know about even if certain types are not available
on this system. */
typedef enum
{
VALTYPE_UNSUPPORTED = 0, /* Artificial type for error detection. */
VALTYPE_CHAR,
VALTYPE_SCHAR,
VALTYPE_UCHAR,
VALTYPE_SHORT,
VALTYPE_USHORT,
VALTYPE_INT,
VALTYPE_UINT,
VALTYPE_LONG,
VALTYPE_ULONG,
VALTYPE_LONGLONG,
VALTYPE_ULONGLONG,
VALTYPE_DOUBLE,
VALTYPE_LONGDOUBLE,
VALTYPE_STRING,
VALTYPE_INTMAX,
VALTYPE_UINTMAX,
VALTYPE_SIZE,
VALTYPE_PTRDIFF,
VALTYPE_POINTER,
VALTYPE_CHAR_PTR,
VALTYPE_SCHAR_PTR,
VALTYPE_SHORT_PTR,
VALTYPE_INT_PTR,
VALTYPE_LONG_PTR,
VALTYPE_LONGLONG_PTR,
VALTYPE_INTMAX_PTR,
VALTYPE_SIZE_PTR,
VALTYPE_PTRDIFF_PTR
} valtype_t;
/* A union used to store the actual values. */
typedef union
{
char a_char;
signed char a_schar;
unsigned char a_uchar;
short a_short;
unsigned short a_ushort;
int a_int;
unsigned int a_uint;
long int a_long;
unsigned long int a_ulong;
#ifdef HAVE_LONG_LONG_INT
long long int a_longlong;
unsigned long long int a_ulonglong;
#endif
double a_double;
#ifdef HAVE_LONG_DOUBLE
long double a_longdouble;
#endif
const char *a_string;
#ifdef HAVE_INTMAX_T
intmax_t a_intmax;
#endif
#ifdef HAVE_UINTMAX_T
intmax_t a_uintmax;
#endif
size_t a_size;
#ifdef HAVE_PTRDIFF_T
ptrdiff_t a_ptrdiff;
#endif
void *a_void_ptr;
char *a_char_ptr;
signed char *a_schar_ptr;
short *a_short_ptr;
int *a_int_ptr;
long *a_long_ptr;
#ifdef HAVE_LONG_LONG_INT
long long int *a_longlong_ptr;
#endif
#ifdef HAVE_INTMAX_T
intmax_t *a_intmax_ptr;
#endif
size_t *a_size_ptr;
#ifdef HAVE_PTRDIFF_T
ptrdiff_t *a_ptrdiff_ptr;
#endif
} value_t;
/* An object used to keep track of a format option and arguments. */
struct argspec_s
{
size_t length; /* The length of these args including the percent. */
unsigned int flags; /* The conversion flags (bits defined by FLAG_foo). */
int width; /* The field width. */
int precision; /* The precision. */
lenmod_t lenmod; /* The length modifier. */
conspec_t conspec; /* The conversion specifier. */
int arg_pos; /* The position of the argument. This one may
be -1 to indicate that no value is expected
(e.g. for "%m"). */
int width_pos; /* The position of the argument for a field
width star's value. 0 for not used. */
int precision_pos; /* The position of the argument for the a
precision star's value. 0 for not used. */
valtype_t vt; /* The type of the corresponding argument. */
};
typedef struct argspec_s *argspec_t;
/* An object to build up a table of values and their types. */
struct valueitem_s
{
valtype_t vt; /* The type of the value. */
value_t value; /* The value. */
};
typedef struct valueitem_s *valueitem_t;
#ifdef DEBUG
static void
dump_argspecs (argspec_t arg, size_t argcount)
{
int idx;
for (idx=0; argcount; argcount--, arg++, idx++)
fprintf (stderr,
"%2d: len=%u flags=%u width=%d prec=%d mod=%d "
"con=%d vt=%d pos=%d-%d-%d\n",
idx,
(unsigned int)arg->length,
arg->flags,
arg->width,
arg->precision,
arg->lenmod,
arg->conspec,
arg->vt,
arg->arg_pos,
arg->width_pos,
arg->precision_pos);
}
#endif /*DEBUG*/
/* Set the vt field for ARG. */
static void
compute_type (argspec_t arg)
{
switch (arg->conspec)
{
case CONSPEC_UNKNOWN:
arg->vt = VALTYPE_UNSUPPORTED;
break;
case CONSPEC_DECIMAL:
switch (arg->lenmod)
{
case LENMOD_CHAR: arg->vt = VALTYPE_SCHAR; break;
case LENMOD_SHORT: arg->vt = VALTYPE_SHORT; break;
case LENMOD_LONG: arg->vt = VALTYPE_LONG; break;
case LENMOD_LONGLONG: arg->vt = VALTYPE_LONGLONG; break;
case LENMOD_INTMAX: arg->vt = VALTYPE_INTMAX; break;
case LENMOD_SIZET: arg->vt = VALTYPE_SIZE; break;
case LENMOD_PTRDIFF: arg->vt = VALTYPE_PTRDIFF; break;
default: arg->vt = VALTYPE_INT; break;
}
break;
case CONSPEC_OCTAL:
case CONSPEC_UNSIGNED:
case CONSPEC_HEX:
case CONSPEC_HEX_UP:
switch (arg->lenmod)
{
case LENMOD_CHAR: arg->vt = VALTYPE_UCHAR; break;
case LENMOD_SHORT: arg->vt = VALTYPE_USHORT; break;
case LENMOD_LONG: arg->vt = VALTYPE_ULONG; break;
case LENMOD_LONGLONG: arg->vt = VALTYPE_ULONGLONG; break;
case LENMOD_INTMAX: arg->vt = VALTYPE_UINTMAX; break;
case LENMOD_SIZET: arg->vt = VALTYPE_SIZE; break;
case LENMOD_PTRDIFF: arg->vt = VALTYPE_PTRDIFF; break;
default: arg->vt = VALTYPE_UINT; break;
}
break;
case CONSPEC_FLOAT:
case CONSPEC_FLOAT_UP:
case CONSPEC_EXP:
case CONSPEC_EXP_UP:
case CONSPEC_F_OR_G:
case CONSPEC_F_OR_G_UP:
case CONSPEC_HEX_EXP:
case CONSPEC_HEX_EXP_UP:
switch (arg->lenmod)
{
case LENMOD_LONGDBL: arg->vt = VALTYPE_LONGDOUBLE; break;
case LENMOD_LONG: arg->vt = VALTYPE_DOUBLE; break;
default: arg->vt = VALTYPE_DOUBLE; break;
}
break;
case CONSPEC_CHAR:
arg->vt = VALTYPE_INT;
break;
case CONSPEC_STRING:
arg->vt = VALTYPE_STRING;
break;
case CONSPEC_POINTER:
arg->vt = VALTYPE_POINTER;
break;
case CONSPEC_STRERROR:
arg->vt = VALTYPE_STRING;
break;
case CONSPEC_BYTES_SO_FAR:
switch (arg->lenmod)
{
case LENMOD_CHAR: arg->vt = VALTYPE_SCHAR_PTR; break;
case LENMOD_SHORT: arg->vt = VALTYPE_SHORT_PTR; break;
case LENMOD_LONG: arg->vt = VALTYPE_LONG_PTR; break;
case LENMOD_LONGLONG: arg->vt = VALTYPE_LONGLONG_PTR; break;
case LENMOD_INTMAX: arg->vt = VALTYPE_INTMAX_PTR; break;
case LENMOD_SIZET: arg->vt = VALTYPE_SIZE_PTR; break;
case LENMOD_PTRDIFF: arg->vt = VALTYPE_PTRDIFF_PTR; break;
default: arg->vt = VALTYPE_INT_PTR; break;
}
break;
}
}
/* Parse the FORMAT string and populate the specification array stored
at the address ARGSPECS_ADDR. The caller has provided enough space
to store up to MAX_ARGSPECS in that buffer. The function may
however ignore the provided buffer and malloc a larger one. On
success the addrrss of that larger buffer will be stored at
ARGSPECS_ADDR. The actual number of specifications will be
returned at R_ARGSPECS_COUNT. */
static int
parse_format (const char *format,
argspec_t *argspecs_addr, size_t max_argspecs,
size_t *r_argspecs_count)
{
const char *s;
argspec_t argspecs = *argspecs_addr;
argspec_t arg;
size_t argcount = 0;
if (!format)
goto leave_einval;
for (; *format; format++)
{
unsigned int flags;
int width, precision;
lenmod_t lenmod;
conspec_t conspec;
int arg_pos, width_pos, precision_pos;
if (*format != '%')
continue;
s = ++format;
if (!*s)
goto leave_einval;
if (*s == '%')
continue; /* Just a quoted percent. */
/* First check whether there is a positional argument. */
arg_pos = 0; /* No positional argument given. */
if (*s >= '1' && *s <= '9')
{
const char *save_s = s;
arg_pos = (*s++ - '0');
for (; *s >= '0' && *s <= '9'; s++)
arg_pos = 10*arg_pos + (*s - '0');
if (arg_pos < 0)
goto leave_einval; /* Overflow during conversion. */
if (*s == '$')
s++;
else
{
arg_pos = 0;
s = save_s;
}
}
/* Parse the flags. */
flags = 0;
for ( ; *s; s++)
{
switch (*s)
{
case '\'': flags |= FLAG_GROUPING; break;
case '-': flags |= FLAG_LEFT_JUST; break;
case '+': flags |= FLAG_PLUS_SIGN; break;
case ' ': flags |= FLAG_SPACE_PLUS; break;
case '#': flags |= FLAG_ALT_CONV; break;
case '0': flags |= FLAG_ZERO_PAD; break;
default:
goto flags_parsed;
}
}
flags_parsed:
/* Parse the field width. */
width_pos = 0;
if (*s == '*')
{
width = STAR_FIELD_VALUE;
s++;
/* If we have a positional argument, another one might also
be used to give the position of the star's value. */
if (arg_pos && *s >= '1' && *s <= '9')
{
width_pos = (*s++ - '0');
for (; *s >= '0' && *s <= '9'; s++)
width_pos = 10*width_pos + (*s - '0');
if (width_pos < 1)
goto leave_einval; /* Overflow during conversion. */
if (*s != '$')
goto leave_einval; /* Not followed by $. */
s++;
}
}
else if ( *s >= '0' && *s <= '9')
{
width = (*s++ - '0');
for (; *s >= '0' && *s <= '9'; s++)
{
if (!width && *s == '0')
goto leave_einval; /* Leading zeroes are not allowed.
Fixme: check what other
implementations do. */
width = 10*width + (*s - '0');
}
if (width < 0)
goto leave_einval; /* Overflow during conversion. */
}
else
width = NO_FIELD_VALUE;
/* Parse the precision. */
precision_pos = 0;
precision = NO_FIELD_VALUE;
if (*s == '.')
{
int ignore_value = (s[1] == '-');
s++;
if (*s == '*')
{
precision = STAR_FIELD_VALUE;
s++;
/* If we have a positional argument, another one might also
be used to give the position of the star's value. */
if (arg_pos && *s >= '1' && *s <= '9')
{
precision_pos = (*s++ - '0');
for (; *s >= '0' && *s <= '9'; s++)
precision_pos = 10*precision_pos + (*s - '0');
if (precision_pos < 1)
goto leave_einval; /* Overflow during conversion. */
if (*s != '$')
goto leave_einval; /* Not followed by $. */
s++;
}
}
else if ( *s >= '0' && *s <= '9')
{
precision = (*s++ - '0');
for (; *s >= '0' && *s <= '9'; s++)
{
if (!precision && *s == '0')
goto leave_einval; /* Leading zeroes are not allowed.
Fixme: check what other
implementations do. */
precision = 10*precision + (*s - '0');
}
if (precision < 0)
goto leave_einval; /* Overflow during conversion. */
}
else
precision = 0;
if (ignore_value)
precision = NO_FIELD_VALUE;
}
/* Parse the length modifiers. */
switch (*s)
{
case 'h':
if (s[1] == 'h')
{
lenmod = LENMOD_CHAR;
s++;
}
else
lenmod = LENMOD_SHORT;
s++;
break;
case 'l':
if (s[1] == 'l')
{
lenmod = LENMOD_LONGLONG;
s++;
}
else
lenmod = LENMOD_LONG;
s++;
break;
case 'j': lenmod = LENMOD_INTMAX; s++; break;
case 'z': lenmod = LENMOD_SIZET; s++; break;
case 't': lenmod = LENMOD_PTRDIFF; s++; break;
case 'L': lenmod = LENMOD_LONGDBL; s++; break;
default: lenmod = LENMOD_NONE; break;
}
/* Parse the conversion specifier. */
switch (*s)
{
case 'd':
case 'i': conspec = CONSPEC_DECIMAL; break;
case 'o': conspec = CONSPEC_OCTAL; break;
case 'u': conspec = CONSPEC_UNSIGNED; break;
case 'x': conspec = CONSPEC_HEX; break;
case 'X': conspec = CONSPEC_HEX_UP; break;
case 'f': conspec = CONSPEC_FLOAT; break;
case 'F': conspec = CONSPEC_FLOAT_UP; break;
case 'e': conspec = CONSPEC_EXP; break;
case 'E': conspec = CONSPEC_EXP_UP; break;
case 'g': conspec = CONSPEC_F_OR_G; break;
case 'G': conspec = CONSPEC_F_OR_G_UP; break;
case 'a': conspec = CONSPEC_HEX_EXP; break;
case 'A': conspec = CONSPEC_HEX_EXP_UP; break;
case 'c': conspec = CONSPEC_CHAR; break;
case 's': conspec = CONSPEC_STRING; break;
case 'p': conspec = CONSPEC_POINTER; break;
case 'n': conspec = CONSPEC_BYTES_SO_FAR; break;
case 'C': conspec = CONSPEC_CHAR; lenmod = LENMOD_LONG; break;
case 'S': conspec = CONSPEC_STRING; lenmod = LENMOD_LONG; break;
case 'm': conspec = CONSPEC_STRERROR; arg_pos = -1; break;
default: conspec = CONSPEC_UNKNOWN;
}
/* Save the args. */
if (argcount >= max_argspecs)
{
/* We either need to allocate a new array instead of the
caller provided one or realloc the array. Instead of
using realloc we allocate a new one and release the
original one then. */
size_t n, newmax;
argspec_t newarg;
newmax = max_argspecs + ARGSPECS_BUMP_VALUE;
if (newmax <= max_argspecs)
goto leave_einval; /* Too many arguments. */
newarg = calloc (newmax, sizeof *newarg);
if (!newarg)
goto leave;
for (n=0; n < argcount; n++)
newarg[n] = argspecs[n];
if (argspecs != *argspecs_addr)
free (argspecs);
argspecs = newarg;
max_argspecs = newmax;
}
arg = argspecs + argcount;
arg->length = s - format + 2;
arg->flags = flags;
arg->width = width;
arg->precision = precision;
arg->lenmod = lenmod;
arg->conspec = conspec;
arg->arg_pos = arg_pos;
arg->width_pos = width_pos;
arg->precision_pos = precision_pos;
compute_type (arg);
argcount++;
format = s;
}
*argspecs_addr = argspecs;
*r_argspecs_count = argcount;
return 0; /* Success. */
leave_einval:
errno = EINVAL;
leave:
if (argspecs != *argspecs_addr)
free (argspecs);
*argspecs_addr = NULL;
return -1;
}
/* This function reads all the values as specified by VALUETABLE into
VALUETABLE. The values are expected in VAARGS. The function
returns -1 if a specified type is not supported. */
static int
read_values (valueitem_t valuetable, size_t valuetable_len, va_list vaargs)
{
int validx;
for (validx=0; validx < valuetable_len; validx++)
{
value_t *value = &valuetable[validx].value;
valtype_t vt = valuetable[validx].vt;
switch (vt)
{
case VALTYPE_CHAR: value->a_char = va_arg (vaargs, int); break;
case VALTYPE_CHAR_PTR:
value->a_char_ptr = va_arg (vaargs, char *);
break;
case VALTYPE_SCHAR: value->a_schar = va_arg (vaargs, int); break;
case VALTYPE_SCHAR_PTR:
value->a_schar_ptr = va_arg (vaargs, signed char *);
break;
case VALTYPE_UCHAR: value->a_uchar = va_arg (vaargs, int); break;
case VALTYPE_SHORT: value->a_short = va_arg (vaargs, int); break;
case VALTYPE_USHORT: value->a_ushort = va_arg (vaargs, int); break;
case VALTYPE_SHORT_PTR:
value->a_short_ptr = va_arg (vaargs, short *);
break;
case VALTYPE_INT:
value->a_int = va_arg (vaargs, int);
break;
case VALTYPE_INT_PTR:
value->a_int_ptr = va_arg (vaargs, int *);
break;
case VALTYPE_UINT:
value->a_uint = va_arg (vaargs, unsigned int);
break;
case VALTYPE_LONG:
value->a_long = va_arg (vaargs, long);
break;
case VALTYPE_ULONG:
value->a_ulong = va_arg (vaargs, unsigned long);
break;
case VALTYPE_LONG_PTR:
value->a_long_ptr = va_arg (vaargs, long *);
break;
#ifdef HAVE_LONG_LONG_INT
case VALTYPE_LONGLONG:
value->a_longlong = va_arg (vaargs, long long int);
break;
case VALTYPE_ULONGLONG:
value->a_ulonglong = va_arg (vaargs, unsigned long long int);
break;
case VALTYPE_LONGLONG_PTR:
value->a_longlong_ptr = va_arg (vaargs, long long *);
break;
#endif
case VALTYPE_DOUBLE:
value->a_double = va_arg (vaargs, double);
break;
#ifdef HAVE_LONG_DOUBLE
case VALTYPE_LONGDOUBLE:
value->a_longdouble = va_arg (vaargs, long double);
break;
#endif
case VALTYPE_STRING:
value->a_string = va_arg (vaargs, const char *);
break;
case VALTYPE_POINTER:
value->a_void_ptr = va_arg (vaargs, void *);
break;
#ifdef HAVE_INTMAX_T
case VALTYPE_INTMAX:
value->a_intmax = va_arg (vaargs, intmax_t);
break;
case VALTYPE_INTMAX_PTR:
value->a_intmax_ptr = va_arg (vaargs, intmax_t *);
break;
#endif
#ifdef HAVE_UINTMAX_T
case VALTYPE_UINTMAX:
value->a_uintmax = va_arg (vaargs, uintmax_t);
break;
#endif
case VALTYPE_SIZE:
value->a_size = va_arg (vaargs, size_t);
break;
case VALTYPE_SIZE_PTR:
value->a_size_ptr = va_arg (vaargs, size_t *);
break;
#ifdef HAVE_PTRDIFF_T
case VALTYPE_PTRDIFF:
value->a_ptrdiff = va_arg (vaargs, ptrdiff_t);
break;
case VALTYPE_PTRDIFF_PTR:
value->a_ptrdiff_ptr = va_arg (vaargs, ptrdiff_t *);
break;
#endif
default: /* Unsupported type. */
return -1;
}
}
return 0;
}
/* Output COUNT padding characters PADCHAR and update NBYTES by the
number of bytes actually written. */
static int
pad_out (estream_printf_out_t outfnc, void *outfncarg,
int padchar, int count, size_t *nbytes)
{
char buf[32];
size_t n;
int rc;
while (count > 0)
{
n = (count <= sizeof buf)? count : sizeof buf;
memset (buf, padchar, n);
rc = outfnc (outfncarg, buf, n);
if (rc)
return rc;
*nbytes += n;
count -= n;
}
return 0;
}
/* "d,i,o,u,x,X" formatting. OUTFNC and OUTFNCARG describes the
output routine, ARG gives the argument description and VALUE the
actual value (its type is available through arg->vt). */
static int
pr_integer (estream_printf_out_t outfnc, void *outfncarg,
argspec_t arg, value_t value, size_t *nbytes)
{
int rc;
#ifdef HAVE_LONG_LONG_INT
unsigned long long aulong;
#else
unsigned long aulong;
#endif
char numbuf[100];
char *p, *pend;
size_t n;
char signchar = 0;
int n_prec; /* Number of extra precision digits required. */
int n_extra; /* Extra number of prefix or sign characters. */
if (arg->conspec == CONSPEC_DECIMAL)
{
#ifdef HAVE_LONG_LONG_INT
long long along;
#else
long along;
#endif
switch (arg->vt)
{
case VALTYPE_SHORT: along = value.a_short; break;
case VALTYPE_INT: along = value.a_int; break;
case VALTYPE_LONG: along = value.a_long; break;
#ifdef HAVE_LONG_LONG_INT
case VALTYPE_LONGLONG: along = value.a_longlong; break;
case VALTYPE_SIZE: along = value.a_size; break;
# ifdef HAVE_INTMAX_T
case VALTYPE_INTMAX: along = value.a_intmax; break;
# endif
# ifdef HAVE_PTRDIFF_T
case VALTYPE_PTRDIFF: along = value.a_ptrdiff; break;
# endif
#endif /*HAVE_LONG_LONG_INT*/
default:
return -1;
}
if (along < 0)
{
aulong = -along;
signchar = '-';
}
else
aulong = along;
}
else
{
switch (arg->vt)
{
case VALTYPE_USHORT: aulong = value.a_ushort; break;
case VALTYPE_UINT: aulong = value.a_uint; break;
case VALTYPE_ULONG: aulong = value.a_ulong; break;
#ifdef HAVE_LONG_LONG_INT
case VALTYPE_ULONGLONG: aulong = value.a_ulonglong; break;
case VALTYPE_SIZE: aulong = value.a_size; break;
# ifdef HAVE_UINTMAX_T
case VALTYPE_UINTMAX: aulong = value.a_uintmax; break;
# endif
# ifdef HAVE_PTRDIFF_T
case VALTYPE_PTRDIFF: aulong = value.a_ptrdiff; break;
# endif
#endif /*HAVE_LONG_LONG_INT*/
default:
return -1;
}
}
if (signchar == '-')
;
else if ((arg->flags & FLAG_PLUS_SIGN))
signchar = '+';
else if ((arg->flags & FLAG_SPACE_PLUS))
signchar = ' ';
n_extra = !!signchar;
/* We build the string up backwards. */
p = pend = numbuf + DIM(numbuf);
if ((!aulong && !arg->precision))
;
else if (arg->conspec == CONSPEC_DECIMAL
|| arg->conspec == CONSPEC_UNSIGNED)
{
int grouping = -1;
const char * grouping_string =
#ifdef HAVE_LANGINFO_THOUSANDS_SEP
nl_langinfo(THOUSANDS_SEP);
#else
"'";
#endif
do
{
if ((arg->flags & FLAG_GROUPING)
&& (++grouping == 3) && *grouping_string)
{
*--p = *grouping_string;
grouping = 0;
}
*--p = '0' + (aulong % 10);
aulong /= 10;
}
while (aulong);
}
else if (arg->conspec == CONSPEC_OCTAL)
{
do
{
*--p = '0' + (aulong % 8);
aulong /= 8;
}
while (aulong);
if ((arg->flags & FLAG_ALT_CONV) && *p != '0')
*--p = '0';
}
else /* HEX or HEXUP */
{
const char *digits = ((arg->conspec == CONSPEC_HEX)
? "0123456789abcdef" : "0123456789ABCDEF");
do
{
*--p = digits[(aulong % 16)];
aulong /= 16;
}
while (aulong);
if ((arg->flags & FLAG_ALT_CONV))
n_extra += 2;
}
n = pend - p;
if ((arg->flags & FLAG_ZERO_PAD)
&& arg->precision == NO_FIELD_VALUE && !(arg->flags & FLAG_LEFT_JUST)
&& n && arg->width - n_extra > n )
n_prec = arg->width - n_extra - n;
else if (arg->precision > 0 && arg->precision > n)
n_prec = arg->precision - n;
else
n_prec = 0;
if (!(arg->flags & FLAG_LEFT_JUST)
&& arg->width >= 0 && arg->width - n_extra > n
&& arg->width - n_extra - n >= n_prec )
{
rc = pad_out (outfnc, outfncarg, ' ',
arg->width - n_extra - n - n_prec, nbytes);
if (rc)
return rc;
}
if (signchar)
{
rc = outfnc (outfncarg, &signchar, 1);
if (rc)
return rc;
*nbytes += 1;
}
if ((arg->flags & FLAG_ALT_CONV)
&& (arg->conspec == CONSPEC_HEX || arg->conspec == CONSPEC_HEX_UP))
{
rc = outfnc (outfncarg, arg->conspec == CONSPEC_HEX? "0x": "0X", 2);
if (rc)
return rc;
*nbytes += 2;
}
if (n_prec)
{
rc = pad_out (outfnc, outfncarg, '0', n_prec, nbytes);
if (rc)
return rc;
}
rc = outfnc (outfncarg, p, pend - p);
if (rc)
return rc;
*nbytes += pend - p;
if ((arg->flags & FLAG_LEFT_JUST)
&& arg->width >= 0 && arg->width - n_extra - n_prec > n)
{
rc = pad_out (outfnc, outfncarg, ' ',
arg->width - n_extra - n_prec - n, nbytes);
if (rc)
return rc;
}
return 0;
}
/* "e,E,f,F,g,G,a,A" formatting. OUTFNC and OUTFNCARG describes the
output routine, ARG gives the argument description and VALUE the
actual value (its type is available through arg->vt). For
portability reasons sprintf is used for the actual formatting.
This is useful because sprint is the only standard function to
convert a floating number into its ascii representation. To avoid
using malloc we just pass the precision to sprintf and do the final
formatting with our own code. */
static int
pr_float (estream_printf_out_t outfnc, void *outfncarg,
argspec_t arg, value_t value, size_t *nbytes)
{
int rc;
#ifdef HAVE_LONG_DOUBLE
long double adblfloat = 0; /* Just to please gcc. */
int use_dbl = 0;
#endif
double afloat;
char numbuf[350];
char formatstr[20];
char *p, *pend;
size_t n;
char signchar = 0;
int n_extra; /* Extra number of prefix or sign characters. */
switch (arg->vt)
{
case VALTYPE_DOUBLE: afloat = value.a_double; break;
#ifdef HAVE_LONG_DOUBLE
case VALTYPE_LONGDOUBLE:
afloat = 0; /* Just to please gcc. */
adblfloat = value.a_longdouble;
use_dbl=1; break;
#endif
default:
return -1;
}
/* We build the string using sprint. */
p = formatstr + sizeof formatstr;
*--p = 0;
switch (arg->conspec)
{
case CONSPEC_FLOAT: *--p = 'f'; break;
case CONSPEC_FLOAT_UP: *--p = 'F'; break;
case CONSPEC_EXP: *--p = 'e'; break;
case CONSPEC_EXP_UP: *--p = 'E'; break;
case CONSPEC_F_OR_G: *--p = 'g'; break;
case CONSPEC_F_OR_G_UP: *--p = 'G'; break;
case CONSPEC_HEX_EXP: *--p = 'a'; break;
case CONSPEC_HEX_EXP_UP: *--p = 'A'; break;
default:
return -1; /* Actually a bug. */
}
#ifdef HAVE_LONG_DOUBLE
if (use_dbl)
*--p = 'L';
#endif
if (arg->precision != NO_FIELD_VALUE)
{
/* Limit it to a meaningful value so that even a stupid sprintf
won't overflow our buffer. */
n = arg->precision <= 100? arg->precision : 100;
do
{
*--p = '0' + (n % 10);
n /= 10;
}
while (n);
*--p = '.';
}
if ((arg->flags & FLAG_ALT_CONV))
*--p = '#';
*--p = '%';
#ifdef HAVE_LONG_DOUBLE
if (use_dbl)
sprintf (numbuf, p, adblfloat);
else
#endif /*HAVE_LONG_DOUBLE*/
sprintf (numbuf, p, afloat);
p = numbuf;
n = strlen (numbuf);
pend = p + n;
if (*p =='-')
{
signchar = '-';
p++;
n--;
}
else if ((arg->flags & FLAG_PLUS_SIGN))
signchar = '+';
else if ((arg->flags & FLAG_SPACE_PLUS))
signchar = ' ';
n_extra = !!signchar;
if (!(arg->flags & FLAG_LEFT_JUST)
&& arg->width >= 0 && arg->width - n_extra > n)
{
rc = pad_out (outfnc, outfncarg, ' ', arg->width - n_extra - n, nbytes);
if (rc)
return rc;
}
if (signchar)
{
rc = outfnc (outfncarg, &signchar, 1);
if (rc)
return rc;
*nbytes += 1;
}
rc = outfnc (outfncarg, p, pend - p);
if (rc)
return rc;
*nbytes += pend - p;
if ((arg->flags & FLAG_LEFT_JUST)
&& arg->width >= 0 && arg->width - n_extra > n)
{
rc = pad_out (outfnc, outfncarg, ' ', arg->width - n_extra - n, nbytes);
if (rc)
return rc;
}
return 0;
}
/* "c" formatting. */
static int
pr_char (estream_printf_out_t outfnc, void *outfncarg,
argspec_t arg, value_t value, size_t *nbytes)
{
int rc;
char buf[1];
if (arg->vt != VALTYPE_INT)
return -1;
buf[0] = (unsigned int)value.a_int;
rc = outfnc (outfncarg, buf, 1);
if(rc)
return rc;
*nbytes += 1;
return 0;
}
/* "s" formatting. */
static int
pr_string (estream_printf_out_t outfnc, void *outfncarg,
argspec_t arg, value_t value, size_t *nbytes)
{
int rc;
size_t n;
const char *string, *s;
if (arg->vt != VALTYPE_STRING)
return -1;
string = value.a_string;
if (!string)
string = "(null)";
if (arg->precision >= 0)
{
for (n=0,s=string; *s && n < arg->precision; s++)
n++;
}
else
n = strlen (string);
if (!(arg->flags & FLAG_LEFT_JUST)
&& arg->width >= 0 && arg->width > n )
{
rc = pad_out (outfnc, outfncarg, ' ', arg->width - n, nbytes);
if (rc)
return rc;
}
rc = outfnc (outfncarg, string, n);
if (rc)
return rc;
*nbytes += n;
if ((arg->flags & FLAG_LEFT_JUST)
&& arg->width >= 0 && arg->width > n)
{
rc = pad_out (outfnc, outfncarg, ' ', arg->width - n, nbytes);
if (rc)
return rc;
}
return 0;
}
/* "p" formatting. */
static int
pr_pointer (estream_printf_out_t outfnc, void *outfncarg,
argspec_t arg, value_t value, size_t *nbytes)
{
int rc;
#ifdef HAVE_LONG_LONG_INT
unsigned long long aulong;
#else
unsigned long aulong;
#endif
char numbuf[100];
char *p, *pend;
if (arg->vt != VALTYPE_POINTER)
return -1;
/* We assume that a pointer can be converted to an unsigned long.
That is not correct for a 64 bit Windows, but then we assume that
long long is supported and usable for storing a pointer. */
#if defined(HAVE_LONG_LONG_INT) && (SIZEOF_UNSIGNED_LONG < SIZEOF_VOID_P)
aulong = (unsigned long long)value.a_void_ptr;
#else
aulong = (unsigned long)value.a_void_ptr;
#endif
p = pend = numbuf + DIM(numbuf);
do
{
*--p = "0123456789abcdefx"[(aulong % 16)];
aulong /= 16;
}
while (aulong);
while ((pend-p) < 2*sizeof (aulong))
*--p = '0';
*--p = 'x';
*--p = '0';
rc = outfnc (outfncarg, p, pend - p);
if (rc)
return rc;
*nbytes += pend - p;
return 0;
}
/* "n" pesudo format operation. */
static int
pr_bytes_so_far (estream_printf_out_t outfnc, void *outfncarg,
argspec_t arg, value_t value, size_t *nbytes)
{
(void)outfnc;
(void)outfncarg;
switch (arg->vt)
{
case VALTYPE_SCHAR_PTR:
*value.a_schar_ptr = (signed char)(unsigned int)(*nbytes);
break;
case VALTYPE_SHORT_PTR:
*value.a_short_ptr = (short)(unsigned int)(*nbytes);
break;
case VALTYPE_LONG_PTR:
*value.a_long_ptr = (long)(*nbytes);
break;
#ifdef HAVE_LONG_LONG_INT
case VALTYPE_LONGLONG_PTR:
*value.a_longlong_ptr = (long long)(*nbytes);
break;
#endif
#ifdef HAVE_INTMAX_T
case VALTYPE_INTMAX_PTR:
*value.a_intmax_ptr = (intmax_t)(*nbytes);
break;
#endif
case VALTYPE_SIZE_PTR:
*value.a_size_ptr = (*nbytes);
break;
#ifdef HAVE_PTRDIFF_T
case VALTYPE_PTRDIFF_PTR:
*value.a_ptrdiff_ptr = (ptrdiff_t)(*nbytes);
break;
#endif
case VALTYPE_INT_PTR:
*value.a_int_ptr = (int)(*nbytes);
break;
default:
return -1; /* An unsupported type has been used. */
}
return 0;
}
/* Run the actual formatting. OUTFNC and OUTFNCARG are the output
functions. FORMAT is format string ARGSPECS is the parsed format
string, ARGSPECS_LEN the number of items in ARGSPECS. VALUETABLE
holds the values and may be directly addressed using the position
arguments given by ARGSPECS. MYERRNO is used for the "%m"
conversion. NBYTES well be updated to reflect the number of bytes
send to the output function. */
static int
do_format (estream_printf_out_t outfnc, void *outfncarg,
const char *format, argspec_t argspecs, size_t argspecs_len,
valueitem_t valuetable, int myerrno, size_t *nbytes)
{
int rc = 0;
const char *s;
argspec_t arg = argspecs;
int argidx = 0; /* Only used for assertion. */
size_t n;
value_t value;
s = format;
while ( *s )
{
if (*s != '%')
{
s++;
continue;
}
if (s != format)
{
rc = outfnc (outfncarg, format, (n=s-format));
if (rc)
return rc;
*nbytes += n;
}
if (s[1] == '%')
{
/* Note that this code ignores one trailing percent escape -
this is however okay as the args parser must have
detected this already. */
rc = outfnc (outfncarg, s, 1);
if (rc)
return rc;
*nbytes += 1;
s += 2;
format = s;
continue;
}
/* Save the next start. */
s += arg->length;
format = s;
assert (argidx < argspecs_len);
argidx++;
/* Apply indirect field width and precision values. */
if (arg->width == STAR_FIELD_VALUE)
{
assert (valuetable[arg->width_pos-1].vt == VALTYPE_INT);
arg->width = valuetable[arg->width_pos-1].value.a_int;
if (arg->width < 0)
{
arg->width = -arg->width;
arg->flags |= FLAG_LEFT_JUST;
}
}
if (arg->precision == STAR_FIELD_VALUE)
{
assert (valuetable[arg->precision_pos-1].vt == VALTYPE_INT);
arg->precision = valuetable[arg->precision_pos-1].value.a_int;
if (arg->precision < 0)
arg->precision = NO_FIELD_VALUE;
}
if (arg->arg_pos == -1 && arg->conspec == CONSPEC_STRERROR)
value.a_string = strerror (myerrno);
else
{
assert (arg->vt == valuetable[arg->arg_pos-1].vt);
value = valuetable[arg->arg_pos-1].value;
}
switch (arg->conspec)
{
case CONSPEC_UNKNOWN: assert (!"bug"); break;
case CONSPEC_DECIMAL:
case CONSPEC_UNSIGNED:
case CONSPEC_OCTAL:
case CONSPEC_HEX:
case CONSPEC_HEX_UP:
rc = pr_integer (outfnc, outfncarg, arg, value, nbytes);
break;
case CONSPEC_FLOAT:
case CONSPEC_FLOAT_UP:
case CONSPEC_EXP:
case CONSPEC_EXP_UP:
case CONSPEC_F_OR_G:
case CONSPEC_F_OR_G_UP:
case CONSPEC_HEX_EXP:
case CONSPEC_HEX_EXP_UP:
rc = pr_float (outfnc, outfncarg, arg, value, nbytes);
break;
case CONSPEC_CHAR:
rc = pr_char (outfnc, outfncarg, arg, value, nbytes);
break;
case CONSPEC_STRING:
case CONSPEC_STRERROR:
rc = pr_string (outfnc, outfncarg, arg, value, nbytes);
break;
case CONSPEC_POINTER:
rc = pr_pointer (outfnc, outfncarg, arg, value, nbytes);
break;
case CONSPEC_BYTES_SO_FAR:
rc = pr_bytes_so_far (outfnc, outfncarg, arg, value, nbytes);
break;
}
if (rc)
return rc;
arg++;
}
/* Print out any trailing stuff. */
n = s - format;
rc = n? outfnc (outfncarg, format, n) : 0;
if (!rc)
*nbytes += n;
return rc;
}
/* The versatile printf formatting routine. It expects a callback
function OUTFNC and an opaque argument OUTFNCARG used for actual
output of the formatted stuff. FORMAT is the format specification
and VAARGS a variable argumemt list matching the arguments of
FORMAT. */
int
estream_format (estream_printf_out_t outfnc,
void *outfncarg,
const char *format, va_list vaargs)
{
/* Buffer to hold the argspecs and a pointer to it.*/
struct argspec_s argspecs_buffer[DEFAULT_MAX_ARGSPECS];
argspec_t argspecs = argspecs_buffer;
size_t argspecs_len; /* Number of specifications in ARGSPECS. */
/* Buffer to hold the description for the values. */
struct valueitem_s valuetable_buffer[DEFAULT_MAX_VALUES];
valueitem_t valuetable = valuetable_buffer;
int rc; /* Return code. */
size_t argidx; /* Used to index the argspecs array. */
size_t validx; /* Used to index the valuetable. */
int max_pos;/* Highest argument position. */
size_t nbytes = 0; /* Keep track of the number of bytes passed to
the output function. */
int myerrno = errno; /* Save the errno for use with "%m". */
/* Parse the arguments to come up with descriptive list. We can't
do this on the fly because we need to support positional
arguments. */
rc = parse_format (format, &argspecs, DIM(argspecs_buffer), &argspecs_len);
if (rc)
goto leave;
/* Check that all ARG_POS fields are set. */
for (argidx=0,max_pos=0; argidx < argspecs_len; argidx++)
{
if (argspecs[argidx].arg_pos != -1
&& argspecs[argidx].arg_pos > max_pos)
max_pos = argspecs[argidx].arg_pos;
if (argspecs[argidx].width_pos > max_pos)
max_pos = argspecs[argidx].width_pos;
if (argspecs[argidx].precision_pos > max_pos)
max_pos = argspecs[argidx].precision_pos;
}
if (!max_pos)
{
/* Fill in all the positions. */
for (argidx=0; argidx < argspecs_len; argidx++)
{
if (argspecs[argidx].width == STAR_FIELD_VALUE)
argspecs[argidx].width_pos = ++max_pos;
if (argspecs[argidx].precision == STAR_FIELD_VALUE)
argspecs[argidx].precision_pos = ++max_pos;
if (argspecs[argidx].arg_pos != -1 )
argspecs[argidx].arg_pos = ++max_pos;
}
}
else
{
/* Check that they are all filled. More test are done later. */
for (argidx=0; argidx < argspecs_len; argidx++)
{
if (!argspecs[argidx].arg_pos
|| (argspecs[argidx].width == STAR_FIELD_VALUE
&& !argspecs[argidx].width_pos)
|| (argspecs[argidx].precision == STAR_FIELD_VALUE
&& !argspecs[argidx].precision_pos))
goto leave_einval;
}
}
/* Check that there is no overflow in max_pos and that it has a
reasonable length. There may never be more elements than the
number of characters in FORMAT. */
if (max_pos < 0 || max_pos >= strlen (format))
goto leave_einval;
#ifdef DEBUG
dump_argspecs (argspecs, argspecs_len);
#endif
/* Allocate a table to hold the values. If it is small enough we
use a stack allocated buffer. */
if (max_pos > DIM(valuetable_buffer))
{
valuetable = calloc (max_pos, sizeof *valuetable);
if (!valuetable)
goto leave_error;
}
else
{
for (validx=0; validx < DIM(valuetable_buffer); validx++)
valuetable[validx].vt = VALTYPE_UNSUPPORTED;
}
for (argidx=0; argidx < argspecs_len; argidx++)
{
if (argspecs[argidx].arg_pos != - 1)
{
validx = argspecs[argidx].arg_pos - 1;
if (valuetable[validx].vt)
goto leave_einval; /* Already defined. */
valuetable[validx].vt = argspecs[argidx].vt;
}
if (argspecs[argidx].width == STAR_FIELD_VALUE)
{
validx = argspecs[argidx].width_pos - 1;
if (valuetable[validx].vt)
goto leave_einval; /* Already defined. */
valuetable[validx].vt = VALTYPE_INT;
}
if (argspecs[argidx].precision == STAR_FIELD_VALUE)
{
validx = argspecs[argidx].precision_pos - 1;
if (valuetable[validx].vt)
goto leave_einval; /* Already defined. */
valuetable[validx].vt = VALTYPE_INT;
}
}
/* Read all the arguments. This will error out for unsupported
types and for not given positional arguments. */
rc = read_values (valuetable, max_pos, vaargs);
if (rc)
goto leave_einval;
/* for (validx=0; validx < max_pos; validx++) */
/* fprintf (stderr, "%2d: vt=%d\n", validx, valuetable[validx].vt); */
/* Everything has been collected, go ahead with the formatting. */
rc = do_format (outfnc, outfncarg, format,
argspecs, argspecs_len, valuetable, myerrno, &nbytes);
goto leave;
leave_einval:
errno = EINVAL;
leave_error:
rc = -1;
leave:
if (valuetable != valuetable_buffer)
free (valuetable);
if (argspecs != argspecs_buffer)
free (argspecs);
return rc;
}
/* A simple output handler utilizing stdio. */
static int
plain_stdio_out (void *outfncarg, const char *buf, size_t buflen)
{
FILE *fp = (FILE*)outfncarg;
if ( fwrite (buf, buflen, 1, fp) != 1 )
return -1;
return 0;
}
/* A replacement for printf. */
int
estream_printf (const char *format, ...)
{
int rc;
va_list arg_ptr;
va_start (arg_ptr, format);
rc = estream_format (plain_stdio_out, stderr, format, arg_ptr);
va_end (arg_ptr);
return rc;
}
/* A replacement for fprintf. */
int
estream_fprintf (FILE *fp, const char *format, ...)
{
int rc;
va_list arg_ptr;
va_start (arg_ptr, format);
rc = estream_format (plain_stdio_out, fp, format, arg_ptr);
va_end (arg_ptr);
return rc;
}
/* A replacement for vfprintf. */
int
estream_vfprintf (FILE *fp, const char *format, va_list arg_ptr)
{
return estream_format (plain_stdio_out, fp, format, arg_ptr);
}
/* Communication object used between estream_snprintf and
fixed_buffer_out. */
struct fixed_buffer_parm_s
{
size_t size; /* Size of the buffer. */
size_t count; /* Number of bytes requested for output. */
size_t used; /* Used size of the buffer. */
char *buffer; /* Provided buffer. */
};
/* A simple malloced buffer output handler. */
static int
fixed_buffer_out (void *outfncarg, const char *buf, size_t buflen)
{
struct fixed_buffer_parm_s *parm = outfncarg;
parm->count += buflen;
if (!parm->buffer)
;
else if (parm->used + buflen < parm->size)
{
/* Handle the common case that everything fits into the buffer
separately. */
memcpy (parm->buffer + parm->used, buf, buflen);
parm->used += buflen;
}
else
{
/* The slow version of above. */
for ( ;buflen && parm->used < parm->size; buflen--)
parm->buffer[parm->used++] = *buf++;
}
return 0;
}
/* A replacement for vsnprintf. */
int
estream_vsnprintf (char *buf, size_t bufsize,
const char *format, va_list arg_ptr)
{
struct fixed_buffer_parm_s parm;
int rc;
parm.size = bufsize;
parm.count = 0;
parm.used = 0;
parm.buffer = bufsize?buf:NULL;
rc = estream_format (fixed_buffer_out, &parm, format, arg_ptr);
if (!rc)
rc = fixed_buffer_out (&parm, "", 1); /* Print terminating Nul. */
if (rc == -1)
return -1;
if (bufsize && buf && parm.size && parm.count >= parm.size)
buf[parm.size-1] = 0;
parm.count--; /* Do not count the trailing nul. */
return (int)parm.count; /* Return number of bytes which would have
been written. */
}
/* A replacement for snprintf. */
int
estream_snprintf (char *buf, size_t bufsize, const char *format, ...)
{
int rc;
va_list arg_ptr;
va_start (arg_ptr, format);
rc = estream_vsnprintf (buf, bufsize, format, arg_ptr);
va_end (arg_ptr);
return rc;
}
/* Communication object used between estream_asprintf and
dynamic_buffer_out. */
struct dynamic_buffer_parm_s
{
int error_flag; /* Internal helper. */
size_t alloced; /* Allocated size of the buffer. */
size_t used; /* Used size of the buffer. */
char *buffer; /* Malloced buffer. */
};
/* A simple malloced buffer output handler. */
static int
dynamic_buffer_out (void *outfncarg, const char *buf, size_t buflen)
{
struct dynamic_buffer_parm_s *parm = outfncarg;
if (parm->error_flag)
{
/* Just in case some formatting routine did not checked for an
error. */
errno = parm->error_flag;
return -1;
}
if (parm->used + buflen >= parm->alloced)
{
char *p;
parm->alloced += buflen + 512;
p = realloc (parm->buffer, parm->alloced);
if (!p)
{
parm->error_flag = errno ? errno : ENOMEM;
/* Wipe out what we already accumulated. This is useful in
case sensitive data is formated. */
memset (parm->buffer, 0, parm->used);
return -1;
}
parm->buffer = p;
}
memcpy (parm->buffer + parm->used, buf, buflen);
parm->used += buflen;
return 0;
}
/* A replacement for vasprintf. As with the BSD of vasprintf version -1
will be returned on error and NULL stored at BUFP. On success the
number of bytes printed will be returned. */
int
estream_vasprintf (char **bufp, const char *format, va_list arg_ptr)
{
struct dynamic_buffer_parm_s parm;
int rc;
parm.error_flag = 0;
parm.alloced = 512;
parm.used = 0;
parm.buffer = my_printf_malloc (parm.alloced);
if (!parm.buffer)
{
*bufp = NULL;
return -1;
}
rc = estream_format (dynamic_buffer_out, &parm, format, arg_ptr);
if (!rc)
rc = dynamic_buffer_out (&parm, "", 1); /* Print terminating Nul. */
/* Fixme: Should we shrink the resulting buffer? */
if (rc != -1 && parm.error_flag)
{
rc = -1;
errno = parm.error_flag;
}
if (rc == -1)
{
memset (parm.buffer, 0, parm.used);
my_printf_free (parm.buffer);
*bufp = NULL;
return -1;
}
assert (parm.used); /* We have at least the terminating Nul. */
*bufp = parm.buffer;
return parm.used - 1; /* Do not include that Nul. */
}
/* A replacement for asprintf. As with the BSD of asprintf version -1
will be returned on error and NULL stored at BUFP. On success the
number of bytes printed will be returned. */
int
estream_asprintf (char **bufp, const char *format, ...)
{
int rc;
va_list arg_ptr;
va_start (arg_ptr, format);
rc = estream_vasprintf (bufp, format, arg_ptr);
va_end (arg_ptr);
return rc;
}
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