From: Jim Meyering Date: Mon, 17 Jul 2000 20:42:12 +0000 (+0000) Subject: from Bruno Haible. X-Git-Tag: cvs-readonly~6416 X-Git-Url: http://erislabs.net/gitweb/?a=commitdiff_plain;h=f2c15d342cfe4dbc79c6d7f466e138bfcc89c901;p=gnulib.git from Bruno Haible. --- diff --git a/lib/mbswidth.c b/lib/mbswidth.c new file mode 100644 index 000000000..9a0d3a99b --- /dev/null +++ b/lib/mbswidth.c @@ -0,0 +1,181 @@ +/* Determine the number of screen columns needed for a string. + Copyright (C) 2000 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* Written by Bruno Haible . */ + +#ifdef HAVE_CONFIG_H +# include +#endif + +/* Tell GNU libc to declare wcwidth(). */ +#ifndef _XOPEN_SOURCE +# define _XOPEN_SOURCE 500 +#endif + +/* Get MB_LEN_MAX. */ +#if HAVE_LIMITS_H +# include +#endif + +/* Get MB_CUR_MAX. */ +#if HAVE_STDLIB_H +# include +#endif + +#if HAVE_STRING_H +# include +#endif + +/* Get isprint(). */ +#include + +/* Get mbstate_t, mbrtowc(), mbsinit(), wcwidth(). */ +#if HAVE_WCHAR_H +# include +#endif + +/* Get iswprint(). */ +#if HAVE_WCTYPE_H +# include +#endif +#if !defined iswprint && !HAVE_ISWPRINT +# define iswprint(wc) 1 +#endif + +/* Some systems, like BeOS, have multibyte encodings but lack mbstate_t. */ +#if HAVE_MBRTOWC && defined mbstate_t +# define mbrtowc(pwc, s, n, ps) (mbrtowc) (pwc, s, n, 0) +# define mbsinit(ps) 1 +#endif + +/* If wcwidth() doesn't exist, assume all printable characters have + width 1. */ +#if !defined wcwidth && !HAVE_WCWIDTH +# define wcwidth(wc) ((wc) == 0 ? 0 : iswprint (wc) ? 1 : -1) +#endif + +/* Get ISPRINT. */ +#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII)) +/* Undefine to protect against the definition in wctype.h of solaris2.6. */ +# undef ISASCII +# define ISASCII(c) 1 +#else +# define ISASCII(c) isascii (c) +#endif +/* Undefine to protect against the definition in wctype.h of solaris2.6. */ +#undef ISPRINT +#define ISPRINT(c) (ISASCII (c) && isprint (c)) + +/* Returns the number of columns needed to represent the multibyte + character string pointed to by STRING. If a non-printable character + occurs, -1 is returned. + This is the multibyte analogon of the wcswidth function. */ +int +mbswidth (const char *string) +{ + const char *p = string; + const char *plimit = p + strlen (p); + int width; + + width = 0; +#if HAVE_MBRTOWC && (MB_LEN_MAX > 1) + if (MB_CUR_MAX > 1) + { + while (p < plimit) + switch (*p) + { + case ' ': case '!': case '"': case '#': case '%': + case '&': case '\'': case '(': case ')': case '*': + case '+': case ',': case '-': case '.': case '/': + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + case ':': case ';': case '<': case '=': case '>': + case '?': + case 'A': case 'B': case 'C': case 'D': case 'E': + case 'F': case 'G': case 'H': case 'I': case 'J': + case 'K': case 'L': case 'M': case 'N': case 'O': + case 'P': case 'Q': case 'R': case 'S': case 'T': + case 'U': case 'V': case 'W': case 'X': case 'Y': + case 'Z': + case '[': case '\\': case ']': case '^': case '_': + case 'a': case 'b': case 'c': case 'd': case 'e': + case 'f': case 'g': case 'h': case 'i': case 'j': + case 'k': case 'l': case 'm': case 'n': case 'o': + case 'p': case 'q': case 'r': case 's': case 't': + case 'u': case 'v': case 'w': case 'x': case 'y': + case 'z': case '{': case '|': case '}': case '~': + /* These characters are printable ASCII characters. */ + p++; + width++; + break; + case '\0': + break; + default: + /* If we have a multibyte sequence, scan it up to its end. */ + { + mbstate_t mbstate; + memset (&mbstate, 0, sizeof mbstate); + do + { + wchar_t wc; + size_t bytes = mbrtowc (&wc, p, plimit - p, &mbstate); + int w; + + if (bytes == 0) + /* A null wide character was encountered. */ + break; + + if (bytes == (size_t) -1) + /* An invalid multibyte sequence was encountered. */ + return -1; + + if (bytes == (size_t) -2) + /* An incomplete multibyte character at the end. */ + return -1; + + w = wcwidth (wc); + if (w >= 0) + /* A printable multibyte character. */ + width += w; + else + /* An unprintable multibyte character. */ + return -1; + + p += bytes; + } + while (! mbsinit (&mbstate)); + } + break; + } + return width; + } +#endif + + while (p < plimit) + { + unsigned char c = (unsigned char) *p++; + + if (c == '\0') + break; + + if (ISPRINT (c)) + width++; + else + return -1; + } + return width; +} diff --git a/lib/mbswidth.h b/lib/mbswidth.h new file mode 100644 index 000000000..1ef47d622 --- /dev/null +++ b/lib/mbswidth.h @@ -0,0 +1,26 @@ +/* Determine the number of screen columns needed for a string. + Copyright (C) 2000 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#ifndef PARAMS +# if defined PROTOTYPES || defined __STDC__ +# define PARAMS(Args) Args +# else +# define PARAMS(Args) () +# endif +#endif + +extern int mbswidth PARAMS ((const char *string));