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Bug 1004: Rewrite FSF code to avoid GPLv2 2. c)

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c_strcasecmp and c_strncasecmp were taken from GNU coreutils 6.9,
which is copyrighted by the Free Software Foundation and licensed
under GNU GPL version 2 or later.  It seems the programs in coreutils
do not normally read commands interactively.  So, including coreutils
code in an interactive program such as ELinks could trigger GPLv2
section 2. c), which would require ELinks to display a copyright
notice and a warranty disclaimer each time it is started.  Rewrite
those functions to remove the FSF-copyrighted code and make ELinks
not a work based on GNU coreutils.

Avoiding FSF code has the additional benefit that we won't have to ask
FSF for permission if we want to add a licence exception that allows
linking ELinks with OpenSSL.  So it seems a good idea even if my
interpretation of GPLv2 2. c) is overly strict.  I haven't checked
though whether there are other FSF-copyrighted portions in ELinks.
This commit is contained in:
Kalle Olavi Niemitalo 2008-11-02 22:15:38 +02:00 committed by Kalle Olavi Niemitalo
parent ffffa763e4
commit c56f3928ec
2 changed files with 23 additions and 70 deletions
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91
src/util/string.c
View File

@ -245,79 +245,32 @@ elinks_strlcasecmp(const unsigned char *s1, size_t n1,
}
}
/* c_strcasecmp
* Taken from GNU coreutils (version 6.9)
* File name: lib/c-strcasecmp.c
* Copyright (C) 1998-1999, 2005-2006 Free Software Foundation, Inc.
* Licensed under the GPL version 2 or any later version.
*/
int c_strcasecmp (const char *s1, const char *s2)
int
c_strcasecmp(const char *s1, const char *s2)
{
register const unsigned char *p1 = (const unsigned char *) s1;
register const unsigned char *p2 = (const unsigned char *) s2;
unsigned char c1, c2;
if (p1 == p2)
return 0;
do
{
c1 = c_tolower (*p1);
c2 = c_tolower (*p2);
if (c1 == '\0')
break;
++p1;
++p2;
}
while (c1 == c2);
if (UCHAR_MAX <= INT_MAX)
return c1 - c2;
else
/* On machines where 'char' and 'int' are types of the same size, the
difference of two 'unsigned char' values - including the sign bit -
doesn't fit in an 'int'. */
return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
for (;; s1++, s2++) {
unsigned char c1 = c_tolower(*(const unsigned char *) s1);
unsigned char c2 = c_tolower(*(const unsigned char *) s2);
if (c1 != c2)
return (c1 < c2) ? -1: +1;
if (c1 == '\0')
return 0;
}
}
/* c_strncasecmp
* Taken from GNU coreutils (version 6.9)
* File name: lib/c-strncasecmp.c
* ^ (note the "n")
* Copyright (C) 1998-1999, 2005-2006 Free Software Foundation, Inc.
* Licensed under the GPL version 2 or any later version.
*/
int c_strncasecmp (const char *s1, const char *s2, size_t n)
int c_strncasecmp(const char *s1, const char *s2, size_t n)
{
register const unsigned char *p1 = (const unsigned char *) s1;
register const unsigned char *p2 = (const unsigned char *) s2;
unsigned char c1, c2;
if (p1 == p2 || n == 0)
return 0;
do
{
c1 = c_tolower (*p1);
c2 = c_tolower (*p2);
if (--n == 0 || c1 == '\0')
break;
++p1;
++p2;
}
while (c1 == c2);
if (UCHAR_MAX <= INT_MAX)
return c1 - c2;
else
/* On machines where 'char' and 'int' are types of the same size, the
difference of two 'unsigned char' values - including the sign bit -
doesn't fit in an 'int'. */
return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
for (; n > 0; n--, s1++, s2++) {
unsigned char c1 = c_tolower(*(const unsigned char *) s1);
unsigned char c2 = c_tolower(*(const unsigned char *) s2);
if (c1 != c2)
return (c1 < c2) ? -1: +1;
if (c1 == '\0')
return 0;
}
return 0;
}
/* c_strcasestr - adapted from src/osdep/stub.c */

2
src/util/string.h
View File

@ -107,7 +107,7 @@ int elinks_strlcasecmp(const unsigned char *s1, size_t n1,
const int locale_indep);
/* strcasecmp and strncasecmp which work as if they are
* in the C locale - both taken from GNU coreutils */
* in the C locale */
int c_strcasecmp(const char *s1, const char *s2);
int c_strncasecmp(const char *s1, const char *s2, size_t n);