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-rw-r--r--printf.c365
1 files changed, 365 insertions, 0 deletions
diff --git a/printf.c b/printf.c
new file mode 100644
index 0000000..97e2c2d
--- /dev/null
+++ b/printf.c
@@ -0,0 +1,365 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2011,2012 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 <stdlib.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;
+};
+
+static struct param_enum *
+param_printf_init(struct value *cb_args, size_t nargs,
+ struct value_dict *arguments)
+{
+ assert(nargs == 1);
+
+ /* We expect a char array pointer. */
+ if (cb_args->type->type != ARGTYPE_POINTER
+ || cb_args->type->u.ptr_info.info->type != ARGTYPE_ARRAY
+ || (cb_args->type->u.ptr_info.info->u.array_info.elt_type->type
+ != ARGTYPE_CHAR))
+ return NULL;
+
+ struct param_enum *self = malloc(sizeof(*self));
+ if (self == NULL) {
+ fail:
+ free(self);
+ return NULL;
+ }
+
+ 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, 1);
+
+ } 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) {
+ if (!self->percent) {
+ if (*self->ptr == '%')
+ self->percent = 1;
+ continue;
+ }
+
+ switch (*self->ptr) {
+ 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;
+ 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++] = *self->ptr;
+ 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;
+ 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;
+ /* XXX "ls" means wchar_t string. */
+ elt_type = ARGTYPE_CHAR;
+ 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,
+ &param_printf_init, &param_printf_next,
+ &param_printf_stop, &param_printf_done);
+}
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