1 /* Determine the number of screen columns needed for a string. 2 Copyright (C) 2000-2004, 2007, 2009-2021 Free Software Foundation, Inc. 3 4 This program is free software: you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 3 of the License, or 7 (at your option) any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 16 17 #include <stddef.h> 18 19 /* Avoid a clash of our mbswidth() with a function of the same name defined 20 in UnixWare 7.1.1 <wchar.h>. We need this #include before the #define 21 below. */ 22 #if HAVE_DECL_MBSWIDTH_IN_WCHAR_H 23 # include <wchar.h> 24 #endif 25 26 27 #ifdef __cplusplus 28 extern "C" { 29 #endif 30 31 32 /* Optional flags to influence mbswidth/mbsnwidth behavior. */ 33 34 /* If this bit is set, return -1 upon finding an invalid or incomplete 35 character. Otherwise, assume invalid characters have width 1. */ 36 #define MBSW_REJECT_INVALID 1 37 38 /* If this bit is set, return -1 upon finding a non-printable character. 39 Otherwise, assume unprintable characters have width 0 if they are 40 control characters and 1 otherwise. */ 41 #define MBSW_REJECT_UNPRINTABLE 2 42 43 44 /* Returns the number of screen columns needed for STRING. */ 45 #define mbswidth gnu_mbswidth /* avoid clash with UnixWare 7.1.1 function */ 46 extern int mbswidth (const char *string, int flags); 47 48 /* Returns the number of screen columns needed for the NBYTES bytes 49 starting at BUF. */ 50 extern int mbsnwidth (const char *buf, size_t nbytes, int flags); 51 52 53 #ifdef __cplusplus 54 } 55 #endif