1  /* Copyright (C) 1991,1992,1995,1996,1997,2001,2002, 2004
       2     Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, write to the Free
      17     Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
      18     Boston, MA  02110-1301  USA */
      19  
      20  /*
      21   * August 2006. For Gawk: Borrowed from GLIBC to replace BSD licensed version.
      22   * DON'T steal this for your own code, just go to the GLIBC sources.
      23   * This version hacked unmercifully.
      24   */
      25  
      26  
      27  /* Compare S1 and S2, ignoring case, returning less than, equal to or
      28     greater than zero if S1 is lexicographically less than,
      29     equal to or greater than S2.  */
      30  int
      31  strcasecmp (s1, s2)
      32       const char *s1;
      33       const char *s2;
      34  {
      35    const unsigned char *p1 = (const unsigned char *) s1;
      36    const unsigned char *p2 = (const unsigned char *) s2;
      37    int result;
      38  
      39    if (p1 == p2)
      40      return 0;
      41  
      42    while ((result = tolower (*p1) - tolower (*p2++)) == 0)
      43      if (*p1++ == '\0')
      44        break;
      45  
      46    return result;
      47  }
      48  
      49  /* Compare at most N characters of two strings without taking care for
      50     the case.
      51     Copyright (C) 1992, 1996, 1997, 2001, 2004 Free Software Foundation, Inc.
      52     This file is part of the GNU C Library.
      53  
      54     The GNU C Library is free software; you can redistribute it and/or
      55     modify it under the terms of the GNU Lesser General Public
      56     License as published by the Free Software Foundation; either
      57     version 2.1 of the License, or (at your option) any later version.
      58  
      59     The GNU C Library is distributed in the hope that it will be useful,
      60     but WITHOUT ANY WARRANTY; without even the implied warranty of
      61     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      62     Lesser General Public License for more details.
      63  
      64     You should have received a copy of the GNU Lesser General Public
      65     License along with the GNU C Library; if not, write to the Free
      66     Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
      67     MA 02110-1335, USA 
      68  */
      69  
      70  /*
      71   * August 2006, for gawk, same comment applies. See strncase.c
      72   * in the GLIBC sources.
      73   */
      74  
      75  
      76  /* Compare no more than N characters of S1 and S2,
      77     ignoring case, returning less than, equal to or
      78     greater than zero if S1 is lexicographically less
      79     than, equal to or greater than S2.  */
      80  int
      81  strncasecmp (s1, s2, n)
      82       const char *s1;
      83       const char *s2;
      84       size_t n;
      85  {
      86    const unsigned char *p1 = (const unsigned char *) s1;
      87    const unsigned char *p2 = (const unsigned char *) s2;
      88    int result;
      89  
      90    if (p1 == p2 || n == 0)
      91      return 0;
      92  
      93    while ((result = tolower (*p1) - tolower (*p2++)) == 0)
      94      if (*p1++ == '\0' || --n == 0)
      95        break;
      96  
      97    return result;
      98  }