/* mbutil.c -- readline multibyte character utility functions */ /* Copyright (C) 2001 Free Software Foundation, Inc. This file is part of the GNU Readline Library, a library for reading lines of text with interactive input and history editing. The GNU Readline Library 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. The GNU Readline Library 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. The GNU General Public License is often shipped with GNU software, and is generally kept in a file called COPYING or LICENSE. If you do not have a copy of the license, write to the Free Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ #define READLINE_LIBRARY #include "config.h" #include #include #include "posixjmp.h" #if defined (HAVE_UNISTD_H) # include /* for _POSIX_VERSION */ #endif /* HAVE_UNISTD_H */ #if defined (HAVE_STDLIB_H) # include #else # include "ansi_stdlib.h" #endif /* HAVE_STDLIB_H */ #include #include /* System-specific feature definitions and include files. */ #include "rldefs.h" #include "rlmbutil.h" #if defined (TIOCSTAT_IN_SYS_IOCTL) # include #endif /* TIOCSTAT_IN_SYS_IOCTL */ /* Some standard library routines. */ #include "readline.h" #include "rlprivate.h" #include "xmalloc.h" /* Declared here so it can be shared between the readline and history libraries. */ #if defined (HANDLE_MULTIBYTE) int rl_byte_oriented = 0; #else int rl_byte_oriented = 1; #endif /* **************************************************************** */ /* */ /* Multibyte Character Utility Functions */ /* */ /* **************************************************************** */ #if defined(HANDLE_MULTIBYTE) int wcwidth (wchar_t wc) { if (wc == 0) return 0; else if (0xff < wc) return 2; return -1; } static int _rl_find_next_mbchar_internal (string, seed, count, find_non_zero) char *string; int seed, count, find_non_zero; { size_t tmp = 0; mbstate_t ps; int point = 0; wchar_t wc; memset(&ps, 0, sizeof (mbstate_t)); if (seed < 0) seed = 0; if (count <= 0) return seed; point = seed + _rl_adjust_point(string, seed, &ps); /* if this is true, means that seed was not pointed character started byte. So correct the point and consume count */ if (seed < point) count --; while (count > 0) { tmp = mbrtowc (&wc, string+point, strlen(string + point), &ps); if ((size_t)(tmp) == (size_t)-1 || (size_t)(tmp) == (size_t)-2) { /* invalid bytes. asume a byte represents a character */ point++; count--; /* reset states. */ memset(&ps, 0, sizeof(mbstate_t)); } else if (tmp == (size_t)0) /* found '\0' char */ break; else { /* valid bytes */ point += tmp; if (find_non_zero) { if (wcwidth (wc) == 0) continue; else count--; } else count--; } } if (find_non_zero) { tmp = mbrtowc (&wc, string + point, strlen (string + point), &ps); while (wcwidth (wc) == 0) { point += tmp; tmp = mbrtowc (&wc, string + point, strlen (string + point), &ps); if (tmp == (size_t)(0) || tmp == (size_t)(-1) || tmp == (size_t)(-2)) break; } } return point; } static int _rl_find_prev_mbchar_internal (string, seed, find_non_zero) char *string; int seed, find_non_zero; { mbstate_t ps; int prev, non_zero_prev, point, length; size_t tmp; wchar_t wc; memset(&ps, 0, sizeof(mbstate_t)); length = strlen(string); if (seed < 0) return 0; else if (length < seed) return length; prev = non_zero_prev = point = 0; while (point < seed) { tmp = mbrtowc (&wc, string + point, length - point, &ps); if ((size_t)(tmp) == (size_t)-1 || (size_t)(tmp) == (size_t)-2) { /* in this case, bytes are invalid or shorted to compose multibyte char, so assume that the first byte represents a single character anyway. */ tmp = 1; /* clear the state of the byte sequence, because in this case effect of mbstate is undefined */ memset(&ps, 0, sizeof (mbstate_t)); } else if (tmp == 0) break; /* Found '\0' char. Can this happen? */ else { if (find_non_zero) { if (wcwidth (wc) != 0) prev = point; } else prev = point; } point += tmp; } return prev; } /* return the number of bytes parsed from the multibyte sequence starting at src, if a non-L'\0' wide character was recognized. It returns 0, if a L'\0' wide character was recognized. It returns (size_t)(-1), if an invalid multibyte sequence was encountered. It returns (size_t)(-2) if it couldn't parse a complete multibyte character. */ int _rl_get_char_len (src, ps) char *src; mbstate_t *ps; { size_t tmp; tmp = mbrlen((const char *)src, (size_t)strlen (src), ps); if (tmp == (size_t)(-2)) { /* shorted to compose multibyte char */ memset (ps, 0, sizeof(mbstate_t)); return -2; } else if (tmp == (size_t)(-1)) { /* invalid to compose multibyte char */ /* initialize the conversion state */ memset (ps, 0, sizeof(mbstate_t)); return -1; } else if (tmp == (size_t)0) return 0; else return (int)tmp; } /* compare the specified two characters. If the characters matched, return 1. Otherwise return 0. */ int _rl_compare_chars (buf1, pos1, ps1, buf2, pos2, ps2) char *buf1, *buf2; mbstate_t *ps1, *ps2; int pos1, pos2; { int i, w1, w2; if ((w1 = _rl_get_char_len (&buf1[pos1], ps1)) <= 0 || (w2 = _rl_get_char_len (&buf2[pos2], ps2)) <= 0 || (w1 != w2) || (buf1[pos1] != buf2[pos2])) return 0; for (i = 1; i < w1; i++) if (buf1[pos1+i] != buf2[pos2+i]) return 0; return 1; } /* adjust pointed byte and find mbstate of the point of string. adjusted point will be point <= adjusted_point, and returns differences of the byte(adjusted_point - point). if point is invalied (point < 0 || more than string length), it returns -1 */ int _rl_adjust_point(string, point, ps) char *string; int point; mbstate_t *ps; { size_t tmp = 0; int length; int pos = 0; length = strlen(string); if (point < 0) return -1; if (length < point) return -1; while (pos < point) { tmp = mbrlen (string + pos, length - pos, ps); if((size_t)(tmp) == (size_t)-1 || (size_t)(tmp) == (size_t)-2) { /* in this case, bytes are invalid or shorted to compose multibyte char, so assume that the first byte represents a single character anyway. */ pos++; /* clear the state of the byte sequence, because in this case effect of mbstate is undefined */ memset (ps, 0, sizeof (mbstate_t)); } else pos += tmp; } return (pos - point); } int _rl_is_mbchar_matched (string, seed, end, mbchar, length) char *string; int seed, end; char *mbchar; int length; { int i; if ((end - seed) < length) return 0; for (i = 0; i < length; i++) if (string[seed + i] != mbchar[i]) return 0; return 1; } #endif /* HANDLE_MULTIBYTE */ /* Find next `count' characters started byte point of the specified seed. If flags is MB_FIND_NONZERO, we look for non-zero-width multibyte characters. */ #undef _rl_find_next_mbchar int _rl_find_next_mbchar (string, seed, count, flags) char *string; int seed, count, flags; { #if defined (HANDLE_MULTIBYTE) return _rl_find_next_mbchar_internal (string, seed, count, flags); #else return (seed + count); #endif } /* Find previous character started byte point of the specified seed. Returned point will be point <= seed. If flags is MB_FIND_NONZERO, we look for non-zero-width multibyte characters. */ #undef _rl_find_prev_mbchar int _rl_find_prev_mbchar (string, seed, flags) char *string; int seed, flags; { #if defined (HANDLE_MULTIBYTE) return _rl_find_prev_mbchar_internal (string, seed, flags); #else return ((seed == 0) ? seed : seed - 1); #endif }