/contrib/groff/src/libs/libgroff/strcasecmp.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 66 lines · 35 code · 11 blank · 20 comment · 10 complexity · 55c9b299ebcf0cd0247fc4ebdfeb3801 MD5 · raw file
- /* strcasecmp.c -- case insensitive string comparator
- Copyright (C) 1998, 1999 Free Software Foundation, Inc.
- This program is free software; you can 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.
- This program 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 this program; if not, write to the Free Software Foundation,
- Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
- #if HAVE_CONFIG_H
- # include <config.h>
- #endif
- #ifdef LENGTH_LIMIT
- # define STRXCASECMP_FUNCTION strncasecmp
- # define STRXCASECMP_DECLARE_N , size_t n
- # define LENGTH_LIMIT_EXPR(Expr) Expr
- #else
- # define STRXCASECMP_FUNCTION strcasecmp
- # define STRXCASECMP_DECLARE_N /* empty */
- # define LENGTH_LIMIT_EXPR(Expr) 0
- #endif
- #include <stddef.h>
- #include <ctype.h>
- #define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
- /* Compare {{no more than N characters of }}strings S1 and S2,
- ignoring case, returning less than, equal to or
- greater than zero if S1 is lexicographically less
- than, equal to or greater than S2. */
- int
- STRXCASECMP_FUNCTION (const char *s1, const char *s2 STRXCASECMP_DECLARE_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 || LENGTH_LIMIT_EXPR (n == 0))
- return 0;
- do
- {
- c1 = TOLOWER (*p1);
- c2 = TOLOWER (*p2);
- if (LENGTH_LIMIT_EXPR (--n == 0) || c1 == '\0')
- break;
- ++p1;
- ++p2;
- }
- while (c1 == c2);
- return c1 - c2;
- }