/*
* This file is part of ltrace.
* Copyright (C) 2011,2012,2013 Petr Machata, Red Hat Inc.
* Copyright (C) 1998,2004,2007,2008,2009 Juan Cespedes
* Copyright (C) 2006 Steve Fink
* Copyright (C) 2006 Ian Wienand
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "printf.h"
#include "type.h"
#include "value.h"
#include "expr.h"
#include "zero.h"
#include "param.h"
#include "lens_default.h"
struct param_enum {
struct value array;
int percent;
size_t *future_length;
char *format;
char const *ptr;
char const *end;
size_t width;
};
static struct param_enum *
param_printf_init(struct value *cb_args, size_t nargs,
struct value_dict *arguments)
{
assert(nargs == 1);
struct process *proc = cb_args[0].inferior;
assert(proc != NULL);
/* We expect a pointer to array. */
if (cb_args->type->type != ARGTYPE_POINTER
|| cb_args->type->u.ptr_info.info->type != ARGTYPE_ARRAY)
return NULL;
/* The element type should be either character (for narrow
* strings) or an integral type (for wide strings). */
struct arg_type_info *et
= cb_args->type->u.ptr_info.info->u.array_info.elt_type;
switch (et->type) {
case ARGTYPE_CHAR:
case ARGTYPE_SHORT:
case ARGTYPE_USHORT:
case ARGTYPE_INT:
case ARGTYPE_UINT:
case ARGTYPE_LONG:
case ARGTYPE_ULONG:
break;
default:
return NULL;
}
struct param_enum *self = malloc(sizeof(*self));
if (self == NULL) {
fail:
free(self);
return NULL;
}
self->width = type_sizeof(proc, et);
if (self->width == (size_t) -1)
goto fail;
if (value_init_deref(&self->array, cb_args) < 0)
goto fail;
assert(self->array.type->type == ARGTYPE_ARRAY);
self->format = (char *)value_get_data(&self->array, arguments);
if (self->format == NULL) {
value_destroy(&self->array);
goto fail;
}
size_t size = value_size(&self->array, arguments);
if (size == (size_t)-1) {
value_destroy(&self->array);
goto fail;
}
self->percent = 0;
self->ptr = self->format;
self->end = self->format + size;
self->future_length = NULL;
return self;
}
static void
drop_future_length(struct param_enum *self)
{
if (self->future_length != NULL) {
free(self->future_length);
self->future_length = NULL;
}
}
static int
form_next_param(struct param_enum *self,
enum arg_type format_type, enum arg_type elt_type,
unsigned hlf, unsigned lng, char *len_buf, size_t len_buf_len,
struct arg_type_info *infop)
{
/* XXX note: Some types are wrong because we lack
ARGTYPE_LONGLONG, ARGTYPE_UCHAR and ARGTYPE_SCHAR. */
assert(lng <= 2);
assert(hlf <= 2);
static enum arg_type ints[] =
{ ARGTYPE_CHAR, ARGTYPE_SHORT, ARGTYPE_INT,
ARGTYPE_LONG, ARGTYPE_ULONG };
static enum arg_type uints[] =
{ ARGTYPE_CHAR, ARGTYPE_USHORT, ARGTYPE_UINT,
ARGTYPE_ULONG, ARGTYPE_ULONG };
struct arg_type_info *elt_info = NULL;
if (format_type == ARGTYPE_ARRAY || format_type == ARGTYPE_POINTER)
elt_info = type_get_simple(elt_type);
else if (format_type == ARGTYPE_INT)
format_type = ints[2 + lng - hlf];
else if (format_type == ARGTYPE_UINT)
format_type = uints[2 + lng - hlf];
if (format_type == ARGTYPE_ARRAY) {
struct arg_type_info *array = malloc(sizeof(*array));
if (array == NULL)
return -1;
struct expr_node *node = NULL;
int own_node;
if (len_buf_len != 0
|| self->future_length != NULL) {
struct tmp {
struct expr_node node;
struct arg_type_info type;
};
struct tmp *len = malloc(sizeof(*len));
if (len == NULL) {
fail:
free(len);
free(array);
return -1;
}
len->type = *type_get_simple(ARGTYPE_LONG);
long l;
if (self->future_length != NULL) {
l = *self->future_length;
drop_future_length(self);
} else {
l = atol(len_buf);
}
expr_init_const_word(&len->node, l, &len->type, 0);
node = build_zero_w_arg(&len->node, 1);
if (node == NULL)
goto fail;
own_node = 1;
} else {
node = expr_node_zero();
own_node = 0;
}
assert(node != NULL);
type_init_array(array, elt_info, 0, node, own_node);
type_init_pointer(infop, array, 1);
} else if (format_type == ARGTYPE_POINTER) {
type_init_pointer(infop, elt_info, 0);
} else {
*infop = *type_get_simple(format_type);
}
return 0;
}
static int
param_printf_next(struct param_enum *self, struct arg_type_info *infop,
int *insert_stop)
{
unsigned hlf = 0;
unsigned lng = 0;
enum arg_type format_type = ARGTYPE_VOID;
enum arg_type elt_type = ARGTYPE_VOID;
char len_buf[25] = {};
size_t len_buf_len = 0;
struct lens *lens = NULL;
for (; self->ptr < self->end; self->ptr += self->width) {
union {
uint8_t u8;
uint16_t u16;
uint32_t u32;
uint64_t u64;
char buf[0];
} u;
memcpy(u.buf, self->ptr, self->width);
switch (self->width) {
case 1: u.u64 = u.u8; break;
case 2: u.u64 = u.u16; break;
case 4: u.u64 = u.u32; break;
}
uint64_t c = u.u64;
if (!self->percent) {
if (c == '%')
self->percent = 1;
continue;
}
switch (c) {
case '#': case ' ': case '-':
case '+': case 'I': case '\'':
/* These are only important for formatting,
* not for interpreting the type. */
continue;
case '*':
/* Length parameter given in the next
* argument. */
if (self->future_length == NULL)
/* This should really be an assert,
* but we can't just fail on invalid
* format string. */
self->future_length
= malloc(sizeof(*self->future_length));
if (self->future_length != NULL) {
self->ptr += self->width;
format_type = ARGTYPE_INT;
break;
}
case '0':
case '1': case '2': case '3':
case '4': case '5': case '6':
case '7': case '8': case '9':
/* Field length likewise, but we need to parse
* this to attach the appropriate string
* length expression. */
if (len_buf_len < sizeof(len_buf) - 1)
len_buf[len_buf_len++] = c;
continue;
case 'h':
if (hlf < 2)
hlf++;
continue;
case 'l':
if (lng < 2)
lng++;
continue;
case 'q':
lng = 2;
continue;
case 'L': /* long double */
lng = 1;
continue;
case 'j': /* intmax_t */
/* XXX ABI should know */
lng = 2;
continue;
case 't': /* ptrdiff_t */
case 'Z': case 'z': /* size_t */
lng = 1; /* XXX ABI should tell */
continue;
case 'd':
case 'i':
format_type = ARGTYPE_INT;
self->percent = 0;
break;
case 'o':
lens = &octal_lens;
goto uint;
case 'x': case 'X':
lens = &hex_lens;
/* Fall through. */
case 'u':
uint:
format_type = ARGTYPE_UINT;
self->percent = 0;
break;
case 'e': case 'E':
case 'f': case 'F':
case 'g': case 'G':
case 'a': case 'A':
format_type = ARGTYPE_DOUBLE;
self->percent = 0;
break;
case 'C': /* like "lc" */
if (lng == 0)
lng++;
case 'c':
/* XXX "lc" means wchar_t string. */
format_type = ARGTYPE_CHAR;
self->percent = 0;
break;
case 'S': /* like "ls" */
if (lng == 0)
lng++;
case 's':
format_type = ARGTYPE_ARRAY;
elt_type = lng == 0 ? ARGTYPE_CHAR : ARGTYPE_INT;
self->percent = 0;
lens = &string_lens;
break;
case 'p':
case 'n': /* int* where to store no. of printed chars. */
format_type = ARGTYPE_POINTER;
elt_type = ARGTYPE_VOID;
self->percent = 0;
break;
case 'm': /* (glibc) print argument of errno */
case '%':
lng = 0;
hlf = 0;
self->percent = 0;
continue;
default:
continue;
}
/* If we got here, the type must have been set. */
assert(format_type != ARGTYPE_VOID);
if (form_next_param(self, format_type, elt_type, hlf, lng,
len_buf, len_buf_len, infop) < 0)
return -1;
infop->lens = lens;
infop->own_lens = 0;
return 0;
}
*infop = *type_get_simple(ARGTYPE_VOID);
return 0;
}
static enum param_status
param_printf_stop(struct param_enum *self, struct value *value)
{
if (self->future_length != NULL
&& value_extract_word(value, (long *)self->future_length, NULL) < 0)
drop_future_length(self);
return PPCB_CONT;
}
static void
param_printf_done(struct param_enum *context)
{
value_destroy(&context->array);
free(context);
}
void
param_pack_init_printf(struct param *param, struct expr_node *arg, int own_arg)
{
param_init_pack(param, PARAM_PACK_VARARGS, arg, 1, own_arg,
¶m_printf_init, ¶m_printf_next,
¶m_printf_stop, ¶m_printf_done);
}