hexstr.c
1.41 KB
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999-2003, 2005-2007, 2009-2012, 2014 Free Software
Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library. If not, see
<http://www.gnu.org/licenses/>. */
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <unistd.h>
/* convert a sequence of hex characters into an integer */
unsigned long
mu_hex2ul (char hex)
{
if (hex >= '0' && hex <= '9')
return hex - '0';
if (hex >= 'a' && hex <= 'z')
return hex - 'a' + 10;
if (hex >= 'A' && hex <= 'Z')
return hex - 'A' + 10;
return -1;
}
size_t
mu_hexstr2ul (unsigned long *ul, const char *hex, size_t len)
{
size_t r;
*ul = 0;
for (r = 0; r < len; r++)
{
unsigned long v = mu_hex2ul (hex[r]);
if (v == (unsigned long)-1)
return r;
*ul = *ul * 16 + v;
}
return r;
}