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/* strtoi.c
* Utilities to convert strings to integers
*
* Copyright 2016, Dario Lombardo
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "strtoi.h"
#include <errno.h>
gboolean ws_strtoi64(const gchar* str, const gchar** endptr, gint64* cint)
{
gchar* end;
gint64 val;
g_assert(cint);
if (!str) {
errno = EINVAL;
return FALSE;
}
errno = 0;
val = g_ascii_strtoll(str, &end, 10);
if ((val == 0 && end == str) || (endptr == NULL && *end != '\0')) {
*cint = 0;
if (endptr != NULL)
*endptr = end;
errno = EINVAL;
return FALSE;
}
if ((val == G_MAXINT64 || val == G_MININT64) && errno == ERANGE) {
/*
* Return the value, so our caller knows whether to
* report the value as "too small" or "too large".
*/
*cint = val;
if (endptr != NULL)
*endptr = end;
/* errno is already set */
return FALSE;
}
if (endptr != NULL)
*endptr = end;
*cint = val;
return TRUE;
}
#define DEFINE_WS_STRTOI_BITS(bits) \
gboolean ws_strtoi##bits(const gchar* str, const gchar** endptr, gint##bits* cint) \
{ \
gint64 val = 0; \
if (!ws_strtoi64(str, endptr, &val)) { \
/* \
* For ERANGE, return either G_MININT##bits or \
* G_MAXINT##bits so our caller knows whether \
* to report the value as "too small" or "too \
* large". \
* \
* For other errors, return 0, for parallelism \
* with ws_strtoi64(). \
*/ \
if (errno == ERANGE) { \
if (val < 0) \
*cint = G_MININT##bits; \
else \
*cint = G_MAXINT##bits; \
} else \
*cint = 0; \
return FALSE; \
} \
if (val < G_MININT##bits) { \
/* \
* Return G_MININT##bits so our caller knows whether to \
* report the value as "too small" or "too large". \
*/ \
*cint = G_MININT##bits; \
errno = ERANGE; \
return FALSE; \
} \
if (val > G_MAXINT##bits) { \
/* \
* Return G_MAXINT##bits so our caller knows whether to \
* report the value as "too small" or "too large". \
*/ \
*cint = G_MAXINT##bits; \
errno = ERANGE; \
return FALSE; \
} \
*cint = (gint##bits)val; \
return TRUE; \
}
DEFINE_WS_STRTOI_BITS(32)
DEFINE_WS_STRTOI_BITS(16)
DEFINE_WS_STRTOI_BITS(8)
static gboolean ws_basestrtou64(const gchar* str, const gchar** endptr, guint64* cint, int base)
{
gchar* end;
guint64 val;
g_assert(cint);
if (!str) {
errno = EINVAL;
return FALSE;
}
if (str[0] == '-' || str[0] == '+') {
/*
* Unsigned numbers don't have a sign.
*/
*cint = 0;
if (endptr != NULL)
*endptr = str;
errno = EINVAL;
return FALSE;
}
errno = 0;
val = g_ascii_strtoull(str, &end, base);
if ((val == 0 && end == str) || (endptr == NULL && *end != '\0')) {
*cint = 0;
if (endptr != NULL)
*endptr = end;
errno = EINVAL;
return FALSE;
}
if (val == G_MAXUINT64 && errno == ERANGE) {
/*
* Return the value, because ws_strtoi64() does.
*/
*cint = val;
if (endptr != NULL)
*endptr = end;
/* errno is already set */
return FALSE;
}
if (endptr != NULL)
*endptr = end;
*cint = val;
return TRUE;
}
gboolean ws_strtou64(const gchar* str, const gchar** endptr, guint64* cint)
{
return ws_basestrtou64(str, endptr, cint, 10);
}
gboolean ws_hexstrtou64(const gchar* str, const gchar** endptr, guint64* cint)
{
return ws_basestrtou64(str, endptr, cint, 16);
}
#define DEFINE_WS_STRTOU_BITS(bits) \
static gboolean ws_basestrtou##bits(const gchar* str, const gchar** endptr, guint##bits* cint, int base) \
{ \
guint64 val; \
if (!ws_basestrtou64(str, endptr, &val, base)) { \
/* \
* For ERANGE, return G_MAXUINT##bits for parallelism \
* with ws_strtoi##bits(). \
* \
* For other errors, return 0, for parallelism \
* with ws_basestrtou64(). \
*/ \
if (errno == ERANGE) \
*cint = G_MAXUINT##bits; \
else \
*cint = 0; \
return FALSE; \
} \
if (val > G_MAXUINT##bits) { \
/* \
* Return G_MAXUINT##bits for parallelism with \
* ws_strtoi##bits(). \
*/ \
*cint = G_MAXUINT##bits; \
errno = ERANGE; \
return FALSE; \
} \
*cint = (guint##bits)val; \
return TRUE; \
} \
\
gboolean ws_strtou##bits(const gchar* str, const gchar** endptr, guint##bits* cint) \
{ \
return ws_basestrtou##bits(str, endptr, cint, 10); \
} \
\
gboolean ws_hexstrtou##bits(const gchar* str, const gchar** endptr, guint##bits* cint) \
{ \
return ws_basestrtou##bits(str, endptr, cint, 16); \
}
DEFINE_WS_STRTOU_BITS(32)
DEFINE_WS_STRTOU_BITS(16)
DEFINE_WS_STRTOU_BITS(8)
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=4 tabstop=8 noexpandtab:
* :indentSize=4:tabSize=8:noTabs=false:
*/
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