265 lines
6.2 KiB
C
265 lines
6.2 KiB
C
/* casemod.c -- functions to change case of strings */
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/* Copyright (C) 2008,2009 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if defined (HAVE_CONFIG_H)
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# include <config.h>
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#endif
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include <stdc.h>
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#include <bashansi.h>
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#include <bashintl.h>
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#include <bashtypes.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <xmalloc.h>
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#include <shmbchar.h>
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#include <shmbutil.h>
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#include <chartypes.h>
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#include <typemax.h>
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#include <glob/strmatch.h>
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#define _to_wupper(wc) (iswlower (wc) ? towupper (wc) : (wc))
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#define _to_wlower(wc) (iswupper (wc) ? towlower (wc) : (wc))
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#if !defined (HANDLE_MULTIBYTE)
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# define cval(s, i) ((s)[(i)])
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# define iswalnum(c) (isalnum(c))
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# define TOGGLE(x) (ISUPPER (x) ? tolower (x) : (TOUPPER (x)))
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#else
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# define TOGGLE(x) (iswupper (x) ? towlower (x) : (_to_wupper(x)))
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#endif
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/* These must agree with the defines in externs.h */
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#define CASE_NOOP 0x0000
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#define CASE_LOWER 0x0001
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#define CASE_UPPER 0x0002
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#define CASE_CAPITALIZE 0x0004
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#define CASE_UNCAP 0x0008
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#define CASE_TOGGLE 0x0010
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#define CASE_TOGGLEALL 0x0020
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#define CASE_UPFIRST 0x0040
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#define CASE_LOWFIRST 0x0080
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#define CASE_USEWORDS 0x1000 /* modify behavior to act on words in passed string */
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extern char *substring __P((char *, int, int));
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#ifndef UCHAR_MAX
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# define UCHAR_MAX TYPE_MAXIMUM(unsigned char)
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#endif
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#if defined (HANDLE_MULTIBYTE)
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static wchar_t
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cval (s, i)
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char *s;
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int i;
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{
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size_t tmp;
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wchar_t wc;
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int l;
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mbstate_t mps;
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if (MB_CUR_MAX == 1 || is_basic (s[i]))
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return ((wchar_t)s[i]);
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l = strlen (s);
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if (i >= (l - 1))
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return ((wchar_t)s[i]);
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memset (&mps, 0, sizeof (mbstate_t));
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tmp = mbrtowc (&wc, s + i, l - i, &mps);
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if (MB_INVALIDCH (tmp) || MB_NULLWCH (tmp))
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return ((wchar_t)s[i]);
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return wc;
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}
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#endif
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/* Modify the case of characters in STRING matching PAT based on the value of
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FLAGS. If PAT is null, modify the case of each character */
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char *
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sh_modcase (string, pat, flags)
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const char *string;
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char *pat;
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int flags;
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{
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int start, next, end;
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int inword, c, nc, nop, match, usewords;
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char *ret, *s;
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wchar_t wc;
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#if defined (HANDLE_MULTIBYTE)
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wchar_t nwc;
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char mb[MB_LEN_MAX+1];
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int mlen;
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size_t m;
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mbstate_t state;
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#endif
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if (string == 0 || *string == 0)
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{
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ret = (char *)xmalloc (1);
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ret[0] = '\0';
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return ret;
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}
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#if defined (HANDLE_MULTIBYTE)
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memset (&state, 0, sizeof (mbstate_t));
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#endif
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start = 0;
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end = strlen (string);
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ret = (char *)xmalloc (end + 1);
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strcpy (ret, string);
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/* See if we are supposed to split on alphanumerics and operate on each word */
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usewords = (flags & CASE_USEWORDS);
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flags &= ~CASE_USEWORDS;
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inword = 0;
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while (start < end)
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{
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wc = cval (ret, start);
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if (iswalnum (wc) == 0)
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{
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inword = 0;
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#if 0
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ADVANCE_CHAR (ret, end, start);
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continue;
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#endif
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}
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if (pat)
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{
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next = start;
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ADVANCE_CHAR (ret, end, next);
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s = substring (ret, start, next);
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match = strmatch (pat, s, FNM_EXTMATCH) != FNM_NOMATCH;
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free (s);
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if (match == 0)
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{
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start = next;
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inword = 1;
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continue;
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}
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}
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/* XXX - for now, the toggling operators work on the individual
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words in the string, breaking on alphanumerics. Should I
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leave the capitalization operators to do that also? */
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if (flags == CASE_CAPITALIZE)
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{
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if (usewords)
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nop = inword ? CASE_LOWER : CASE_UPPER;
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else
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nop = (start > 0) ? CASE_LOWER : CASE_UPPER;
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inword = 1;
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}
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else if (flags == CASE_UNCAP)
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{
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if (usewords)
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nop = inword ? CASE_UPPER : CASE_LOWER;
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else
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nop = (start > 0) ? CASE_UPPER : CASE_LOWER;
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inword = 1;
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}
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else if (flags == CASE_UPFIRST)
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{
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if (usewords)
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nop = inword ? CASE_NOOP : CASE_UPPER;
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else
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nop = (start > 0) ? CASE_NOOP : CASE_UPPER;
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inword = 1;
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}
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else if (flags == CASE_LOWFIRST)
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{
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if (usewords)
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nop = inword ? CASE_NOOP : CASE_LOWER;
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else
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nop = (start > 0) ? CASE_NOOP : CASE_LOWER;
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inword = 1;
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}
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else if (flags == CASE_TOGGLE)
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{
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nop = inword ? CASE_NOOP : CASE_TOGGLE;
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inword = 1;
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}
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else
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nop = flags;
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/* Need to check UCHAR_MAX since wc may have already been converted to a
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wide character by cval() */
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if (MB_CUR_MAX == 1 || (wc <= UCHAR_MAX && is_basic ((int)wc)))
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{
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singlebyte:
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switch (nop)
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{
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default:
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case CASE_NOOP: nc = wc; break;
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case CASE_UPPER: nc = TOUPPER (wc); break;
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case CASE_LOWER: nc = TOLOWER (wc); break;
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case CASE_TOGGLEALL:
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case CASE_TOGGLE: nc = TOGGLE (wc); break;
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}
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ret[start] = nc;
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}
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#if defined (HANDLE_MULTIBYTE)
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else
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{
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m = mbrtowc (&wc, string + start, end - start, &state);
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if (MB_INVALIDCH (m))
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{
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wc = (unsigned char)string[start];
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goto singlebyte;
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}
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else if (MB_NULLWCH (m))
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wc = L'\0';
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switch (nop)
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{
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default:
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case CASE_NOOP: nwc = wc; break;
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case CASE_UPPER: nwc = _to_wupper (wc); break;
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case CASE_LOWER: nwc = _to_wlower (wc); break;
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case CASE_TOGGLEALL:
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case CASE_TOGGLE: nwc = TOGGLE (wc); break;
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}
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if (nwc != wc) /* just skip unchanged characters */
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{
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mlen = wcrtomb (mb, nwc, &state);
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if (mlen > 0)
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mb[mlen] = '\0';
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/* Assume the same width */
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strncpy (ret + start, mb, mlen);
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}
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}
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#endif
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/* This assumes that the upper and lower case versions are the same width. */
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ADVANCE_CHAR (ret, end, start);
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}
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return ret;
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}
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