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| Current File : //usr/src/contrib/ntp/libopts/streqvcmp.c |
/*
* $Id: streqvcmp.c,v 4.10 2007/04/28 22:19:23 bkorb Exp $
* Time-stamp: "2006-07-26 18:25:53 bkorb"
*
* String Equivalence Comparison
*
* These routines allow any character to be mapped to any other
* character before comparison. In processing long option names,
* the characters "-", "_" and "^" all need to be equivalent
* (because they are treated so by different development environments).
*/
/*
* Automated Options copyright 1992-2007 Bruce Korb
*
* Automated Options is free software.
* You may 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, or (at your option) any later version.
*
* Automated Options 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 Automated Options. See the file "COPYING". If not,
* write to: The Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* As a special exception, Bruce Korb gives permission for additional
* uses of the text contained in his release of AutoOpts.
*
* The exception is that, if you link the AutoOpts library with other
* files to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the AutoOpts library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by Bruce Korb under
* the name AutoOpts. If you copy code from other sources under the
* General Public License into a copy of AutoOpts, as the General Public
* License permits, the exception does not apply to the code that you add
* in this way. To avoid misleading anyone as to the status of such
* modified files, you must delete this exception notice from them.
*
* If you write modifications of your own for AutoOpts, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice.
*/
/*
* This array is designed for mapping upper and lower case letter
* together for a case independent comparison. The mappings are
* based upon ascii character sequences.
*/
static unsigned char charmap[] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, '\a',
'\b', '\t', '\n', '\v', '\f', '\r', 0x0E, 0x0F,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
' ', '!', '"', '#', '$', '%', '&', '\'',
'(', ')', '*', '+', ',', '-', '.', '/',
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', ':', ';', '<', '=', '>', '?',
'@', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
'x', 'y', 'z', '[', '\\', ']', '^', '_',
'`', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
'x', 'y', 'z', '{', '|', '}', '~', 0x7f,
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,
0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7,
0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,
0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,
0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7,
0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF,
};
/*=export_func strneqvcmp
*
* what: compare two strings with an equivalence mapping
*
* arg: + char const* + str1 + first string +
* arg: + char const* + str2 + second string +
* arg: + int + ct + compare length +
*
* ret_type: int
* ret_desc: the difference between two differing characters
*
* doc:
*
* Using a character mapping, two strings are compared for "equivalence".
* Each input character is mapped to a comparison character and the
* mapped-to characters are compared for the two NUL terminated input strings.
* The comparison is limited to @code{ct} bytes.
* This function name is mapped to option_strneqvcmp so as to not conflict
* with the POSIX name space.
*
* err: none checked. Caller responsible for seg faults.
=*/
int
strneqvcmp( tCC* s1, tCC* s2, int ct )
{
for (; ct > 0; --ct) {
unsigned char u1 = (unsigned char) *s1++;
unsigned char u2 = (unsigned char) *s2++;
int dif = charmap[ u1 ] - charmap[ u2 ];
if (dif != 0)
return dif;
if (u1 == NUL)
return 0;
}
return 0;
}
/*=export_func streqvcmp
*
* what: compare two strings with an equivalence mapping
*
* arg: + char const* + str1 + first string +
* arg: + char const* + str2 + second string +
*
* ret_type: int
* ret_desc: the difference between two differing characters
*
* doc:
*
* Using a character mapping, two strings are compared for "equivalence".
* Each input character is mapped to a comparison character and the
* mapped-to characters are compared for the two NUL terminated input strings.
* This function name is mapped to option_streqvcmp so as to not conflict
* with the POSIX name space.
*
* err: none checked. Caller responsible for seg faults.
=*/
int
streqvcmp( tCC* s1, tCC* s2 )
{
for (;;) {
unsigned char u1 = (unsigned char) *s1++;
unsigned char u2 = (unsigned char) *s2++;
int dif = charmap[ u1 ] - charmap[ u2 ];
if (dif != 0)
return dif;
if (u1 == NUL)
return 0;
}
}
/*=export_func streqvmap
*
* what: Set the character mappings for the streqv functions
*
* arg: + char + From + Input character +
* arg: + char + To + Mapped-to character +
* arg: + int + ct + compare length +
*
* doc:
*
* Set the character mapping. If the count (@code{ct}) is set to zero, then
* the map is cleared by setting all entries in the map to their index
* value. Otherwise, the "@code{From}" character is mapped to the "@code{To}"
* character. If @code{ct} is greater than 1, then @code{From} and @code{To}
* are incremented and the process repeated until @code{ct} entries have been
* set. For example,
* @example
* streqvmap( 'a', 'A', 26 );
* @end example
* @noindent
* will alter the mapping so that all English lower case letters
* will map to upper case.
*
* This function name is mapped to option_streqvmap so as to not conflict
* with the POSIX name space.
*
* err: none.
=*/
void
streqvmap( char From, char To, int ct )
{
if (ct == 0) {
ct = sizeof( charmap ) - 1;
do {
charmap[ ct ] = ct;
} while (--ct >= 0);
}
else {
int chTo = (int)To & 0xFF;
int chFrom = (int)From & 0xFF;
do {
charmap[ chFrom ] = (unsigned)chTo;
chFrom++;
chTo++;
if ((chFrom >= sizeof( charmap )) || (chTo >= sizeof( charmap )))
break;
} while (--ct > 0);
}
}
/*=export_func strequate
*
* what: map a list of characters to the same value
*
* arg: + char const* + ch_list + characters to equivalence +
*
* doc:
*
* Each character in the input string get mapped to the first character
* in the string.
* This function name is mapped to option_strequate so as to not conflict
* with the POSIX name space.
*
* err: none.
=*/
void
strequate( char const* s )
{
if ((s != NULL) && (*s != NUL)) {
unsigned char equiv = (unsigned)*s;
while (*s != NUL)
charmap[ (unsigned)*(s++) ] = equiv;
}
}
/*=export_func strtransform
*
* what: convert a string into its mapped-to value
*
* arg: + char* + dest + output string +
* arg: + char const* + src + input string +
*
* doc:
*
* Each character in the input string is mapped and the mapped-to
* character is put into the output.
* This function name is mapped to option_strtransform so as to not conflict
* with the POSIX name space.
*
* err: none.
=*/
void
strtransform( char* d, char const* s )
{
do {
*(d++) = (char)charmap[ (unsigned)*s ];
} while (*(s++) != NUL);
}
/*
* Local Variables:
* mode: C
* c-file-style: "stroustrup"
* indent-tabs-mode: nil
* End:
* end of autoopts/streqvcmp.c */