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/*****************************************************************
**
** @(#) strlist.c (c) Mar 2005 Holger Zuleger
**
** TODO: Maybe we should use a special type for the list:
** typedef struct { char cnt; char list[0+1]; } strlist__t;
** This results in better type control of the function parameters
**
** Copyright (c) Mar 2005, Holger Zuleger HZnet. All rights reserved.
**
** This software is open source.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** Redistributions of source code must retain the above copyright notice,
** this list of conditions and the following disclaimer.
**
** Redistributions in binary form must reproduce the above copyright notice,
** this list of conditions and the following disclaimer in the documentation
** and/or other materials provided with the distribution.
**
** Neither the name of Holger Zuleger HZnet nor the names of its contributors may
** be used to endorse or promote products derived from this software without
** specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
** TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
** PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
** LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
** INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
** CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
** ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
** POSSIBILITY OF SUCH DAMAGE.
**
*****************************************************************/
#ifdef TEST
# include <stdio.h>
#endif
#include <string.h>
#include <stdlib.h>
#include "strlist.h"
/*****************************************************************
** prepstrlist (str, delim)
** prepare a string with delimeters to a so called strlist.
** 'str' is a list of substrings delimeted by 'delim'
** The # of strings is stored at the first byte of the allocated
** memory. Every substring is stored as a '\0' terminated C-String.
** The function returns a pointer to dynamic allocated memory
*****************************************************************/
char *prepstrlist (const char *str, const char *delim)
{
char *p;
char *new;
int len;
int cnt;
if ( str == NULL )
return NULL;
len = strlen (str);
if ( (new = malloc (len + 2)) == NULL )
return new;
cnt = 0;
p = new;
for ( *p++ = '\0'; *str; str++ )
{
if ( strchr (delim, *str) == NULL )
*p++ = *str;
else if ( p[-1] != '\0' )
{
*p++ = '\0';
cnt++;
}
}
*p = '\0'; /*terminate string */
if ( p[-1] != '\0' )
cnt++;
*new = cnt & 0xFF;
return new;
}
/*****************************************************************
** isinlist (str, list)
** check if 'list' contains 'str'
*****************************************************************/
int isinlist (const char *str, const char *list)
{
int cnt;
if ( list == NULL || *list == '\0' )
return 1;
if ( str == NULL || *str == '\0' )
return 0;
cnt = *list;
while ( cnt-- > 0 )
{
list++;
if ( strcmp (str, list) == 0 )
return 1;
list += strlen (list);
}
return 0;
}
/*****************************************************************
** unprepstrlist (list, delimc)
*****************************************************************/
char *unprepstrlist (char *list, char delimc)
{
char *p;
int cnt;
cnt = *list & 0xFF;
p = list;
for ( *p++ = delimc; cnt > 1; p++ )
if ( *p == '\0' )
{
*p = delimc;
cnt--;
}
return list;
}
#ifdef TEST
main (int argc, char *argv[])
{
FILE *fp;
char *p;
char *searchlist = NULL;
char group[255];
if ( argc > 1 )
searchlist = prepstrlist (argv[1], LISTDELIM);
printf ("searchlist: %d entrys: \n", searchlist[0]);
if ( (fp = fopen ("/etc/group", "r")) == NULL )
exit (fprintf (stderr, "can't open file\n"));
while ( fscanf (fp, "%[^:]:%*[^\n]\n", group) != EOF )
if ( isinlist (group, searchlist) )
printf ("%s\n", group);
fclose (fp);
printf ("searchlist: \"%s\"\n", unprepstrlist (searchlist, *LISTDELIM));
for ( p = searchlist; *p; p++ )
if ( *p < 32 )
printf ("<%d>", *p);
else
printf ("%c", *p);
printf ("\n");
}
#endif
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