compiler/arossupport/strrncasecmp.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Compare the tails of two strings
   6     Lang: english
   7 */
   8
   9 #include <ctype.h>
  10
  11 /*****************************************************************************
  12
  13     NAME */
  14 #include <string.h>
  15
  16         int strrncasecmp (
  17
  18 /*  SYNOPSIS */
  19         const char * str1,
  20         const char * str2,
  21         int          cnt)
  22
  23 /*  FUNCTION
  24         Compare the end parts of two strings. Case is ignored.
  25
  26     INPUTS
  27         str1, str2 - Strings to compare
  28         cnt - Compare that many characters
  29
  30     RESULT
  31         Returns 0 if the strings are equal and != 0 otherwise.
  32
  33     NOTES
  34         This function is not part of a library and may thus be called
  35         any time.
  36
  37     EXAMPLE
  38         // rc = 0
  39         rc = strrncasecmp ("disk.info", ".INFO", 5);
  40
  41         // rc <> 0
  42         rc = strrncasecmp ("disk.info", ".c", 2);
  43
  44     BUGS
  45
  46     SEE ALSO
  47         clib/strcmp(), clib/strcasecmp(), clib/strncasecmp(), clib/strrchr()
  48
  49     INTERNALS
  50
  51     HISTORY
  52
  53 ******************************************************************************/
  54 {
  55     const char * ptr1, * ptr2;
  56     int diff = 0;
  57
  58     /* If any string is empty, the strings are equal */
  59     if (!*str1 || !*str2)
  60         return 0;
  61
  62     ptr1 = str1;
  63
  64     while (*ptr1)
  65         ptr1++;
  66
  67     ptr2 = str2;
  68
  69     while (*ptr2)
  70         ptr2++;
  71
  72     do
  73     {
  74         if (!cnt)
  75             break;
  76
  77         cnt --;
  78         ptr1 --;
  79         ptr2 --;
  80
  81         diff = tolower (*ptr1) - tolower (*ptr2);
  82     }
  83     while (!diff && ptr1 != str1 && ptr2 != str2);
  84
  85     /* Compared all neccessary chars ? */
  86     if (!cnt)
  87         return diff;
  88
  89     /* Run out of chars in only one of the two strings ? */
  90     if (ptr1 != str1)
  91         diff = 1;
  92     else if (ptr2 != str2)
  93         diff = -1;
  94
  95     /* The strings differ */
  96     return diff;
  97 } /* strrncasecmp */
  98
  99 #ifdef TEST
 100 #include <stdio.h>
 101
 102 int main (int argc, char ** argv)
 103 {
 104     int n;
 105
 106     if (argc != 4)
 107     {
 108         fprintf (stderr, "Usage: %s string1 string2 len\n", argv[0]);
 109         return 5;
 110     }
 111
 112     n = atoi (argv[3]);
 113
 114     printf ("strrncasecmp (\"%s\", \"%s\", %d) = %d\n",
 115         argv[1],
 116         argv[2],
 117         n,
 118         strrncasecmp (argv[1], argv[2], n)
 119     );
 120
 121 } /* main */
 122
 123 #endif /* TEST */