mirror of git://git.sv.gnu.org/nano.git
362 lines
9.2 KiB
C
362 lines
9.2 KiB
C
/* $Id$ */
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/**************************************************************************
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* utils.c *
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* *
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* Copyright (C) 1999-2003 Chris Allegretta *
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* This program 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 2, or (at your option) *
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* any later version. *
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* *
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* This program 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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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software *
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
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* *
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**************************************************************************/
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#include "config.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <assert.h>
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#include "proto.h"
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#include "nano.h"
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int is_cntrl_char(int c)
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{
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return (-128 <= c && c < -96) || (0 <= c && c < 32) ||
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(127 <= c && c < 160);
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}
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int num_of_digits(int n)
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{
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int i = 1;
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if (n < 0)
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n = -n;
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while (n > 10) {
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n /= 10;
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i++;
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}
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return i;
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}
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/* Fix the memory allocation for a string. */
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void align(char **strp)
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{
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if (strp != NULL)
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*strp = nrealloc(*strp, strlen(*strp) + 1);
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}
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/* Null a string at a certain index and align it. */
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void null_at(char **data, size_t index)
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{
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assert(data != NULL);
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*data = (char *)nrealloc(*data, sizeof(char) * (index + 1));
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(*data)[index] = '\0';
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}
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/* For non-null-terminated lines. A line, by definition, shouldn't
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* normally have newlines in it, so encode its nulls as newlines. */
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void unsunder(char *str, size_t true_len)
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{
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assert(str != NULL);
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for(; true_len > 0; true_len--, str++)
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if (*str == '\0')
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*str = '\n';
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}
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/* For non-null-terminated lines. A line, by definition, shouldn't
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* normally have newlines in it, so decode its newlines into nulls. */
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void sunder(char *str)
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{
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assert(str != NULL);
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for(; *str != '\0'; str++)
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if (*str == '\n')
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*str = '\0';
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}
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/* None of this is needed if we're using NANO_SMALL! */
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#ifndef NANO_SMALL
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const char *revstrstr(const char *haystack, const char *needle,
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const char *rev_start)
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{
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for(; rev_start >= haystack ; rev_start--) {
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const char *r, *q;
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for (r = rev_start, q = needle ; *q == *r && *q != '\0'; r++, q++)
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;
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if (*q == '\0')
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return rev_start;
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}
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return NULL;
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}
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const char *revstristr(const char *haystack, const char *needle,
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const char *rev_start)
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{
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for (; rev_start >= haystack; rev_start--) {
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const char *r = rev_start, *q = needle;
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for (; (tolower(*q) == tolower(*r)) && (*q != '\0') ; r++, q++)
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;
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if (*q == '\0')
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return rev_start;
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}
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return NULL;
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}
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#endif /* !NANO_SMALL */
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/* This is now mutt's version (called mutt_stristr) because it doesn't
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* use memory allocation to do a simple search (yuck). */
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const char *stristr(const char *haystack, const char *needle)
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{
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const char *p, *q;
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if (haystack == NULL)
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return NULL;
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if (needle == NULL)
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return haystack;
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while (*(p = haystack) != '\0') {
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for (q = needle; *p != 0 && *q != 0 && tolower(*p) == tolower(*q); p++, q++)
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;
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if (*q == 0)
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return haystack;
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haystack++;
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}
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return NULL;
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}
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/* If we are searching backwards, we will find the last match
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* that starts no later than rev_start. If we are doing a regexp search,
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* then line_pos should be 0 if haystack starts at the beginning of a
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* line, and positive otherwise. In the regexp case, we fill in the
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* global variable regmatches with at most 9 subexpression matches. Also,
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* all .rm_so elements are relative to the start of the whole match, so
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* regmatches[0].rm_so == 0. */
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const char *strstrwrapper(const char *haystack, const char *needle,
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const char *rev_start, int line_pos)
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{
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#ifdef HAVE_REGEX_H
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if (ISSET(USE_REGEXP)) {
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#ifndef NANO_SMALL
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if (ISSET(REVERSE_SEARCH)) {
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/* When doing a backwards search, haystack is a whole line. */
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if (!regexec(&search_regexp, haystack, 1, regmatches, 0) &&
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haystack + regmatches[0].rm_so <= rev_start) {
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const char *retval = haystack + regmatches[0].rm_so;
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/* Search forward until there is no more match. */
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while (!regexec(&search_regexp, retval + 1, 1, regmatches,
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REG_NOTBOL) &&
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retval + 1 + regmatches[0].rm_so <= rev_start)
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retval += 1 + regmatches[0].rm_so;
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/* Finally, put the subexpression matches in global
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* variable regmatches. The REG_NOTBOL flag doesn't
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* matter now. */
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regexec(&search_regexp, retval, 10, regmatches, 0);
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return retval;
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}
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} else
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#endif /* !NANO_SMALL */
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if (!regexec(&search_regexp, haystack, 10, regmatches,
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line_pos > 0 ? REG_NOTBOL : 0)) {
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const char *retval = haystack + regmatches[0].rm_so;
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regexec(&search_regexp, retval, 10, regmatches, 0);
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return retval;
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}
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return NULL;
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}
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#endif /* HAVE_REGEX_H */
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#ifndef NANO_SMALL
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if (ISSET(CASE_SENSITIVE)) {
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if (ISSET(REVERSE_SEARCH))
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return revstrstr(haystack, needle, rev_start);
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else
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return strstr(haystack, needle);
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} else if (ISSET(REVERSE_SEARCH))
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return revstristr(haystack, needle, rev_start);
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#endif
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return stristr(haystack, needle);
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}
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/* This is a wrapper for the perror function. The wrapper takes care of
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* ncurses, calls perror (which writes to STDERR), then refreshes the
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* screen. Note that nperror causes the window to flicker once. */
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void nperror(const char *s)
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{
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/* leave ncurses mode, go to the terminal */
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if (endwin() != ERR) {
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perror(s); /* print the error */
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total_refresh(); /* return to ncurses and repaint */
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}
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}
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/* Thanks BG, many ppl have been asking for this... */
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void *nmalloc(size_t howmuch)
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{
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void *r = malloc(howmuch);
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if (r == NULL && howmuch != 0)
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die(_("nano is out of memory!"));
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return r;
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}
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void *nrealloc(void *ptr, size_t howmuch)
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{
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void *r = realloc(ptr, howmuch);
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if (r == NULL && howmuch != 0)
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die(_("nano is out of memory!"));
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return r;
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}
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/* Copy one malloc()ed string to another pointer. Should be used as:
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* dest = mallocstrcpy(dest, src); */
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char *mallocstrcpy(char *dest, const char *src)
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{
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if (src == dest)
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return dest;
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if (dest != NULL)
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free(dest);
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if (src == NULL)
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return NULL;
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dest = charalloc(strlen(src) + 1);
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strcpy(dest, src);
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return dest;
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}
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/* Append a new magic-line to filebot. */
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void new_magicline(void)
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{
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filebot->next = nmalloc(sizeof(filestruct));
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filebot->next->data = charalloc(1);
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filebot->next->data[0] = '\0';
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filebot->next->prev = filebot;
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filebot->next->next = NULL;
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filebot->next->lineno = filebot->lineno + 1;
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filebot = filebot->next;
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totlines++;
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totsize++;
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}
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#ifndef DISABLE_TABCOMP
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/*
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* Routine to see if a text string is matched by a wildcard pattern.
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* Returns TRUE if the text is matched, or FALSE if it is not matched
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* or if the pattern is invalid.
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* * matches zero or more characters
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* ? matches a single character
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* [abc] matches 'a', 'b' or 'c'
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* \c quotes character c
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* Adapted from code written by Ingo Wilken, and
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* then taken from sash, Copyright (c) 1999 by David I. Bell
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* Permission is granted to use, distribute, or modify this source,
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* provided that this copyright notice remains intact.
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* Permission to distribute this code under the GPL has been granted.
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*/
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int check_wildcard_match(const char *text, const char *pattern)
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{
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const char *retrypat;
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const char *retrytext;
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int ch;
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int found;
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int len;
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retrypat = NULL;
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retrytext = NULL;
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while (*text != '\0' || *pattern != '\0') {
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ch = *pattern++;
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switch (ch) {
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case '*':
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retrypat = pattern;
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retrytext = text;
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break;
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case '[':
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found = FALSE;
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while ((ch = *pattern++) != ']') {
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if (ch == '\\')
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ch = *pattern++;
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if (ch == '\0')
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return FALSE;
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if (*text == ch)
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found = TRUE;
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}
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len = strlen(text);
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if (found == FALSE && len != 0) {
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return FALSE;
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}
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if (found == TRUE) {
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if (strlen(pattern) == 0 && len == 1) {
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return TRUE;
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}
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if (len != 0) {
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text++;
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continue;
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}
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}
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/* fall into next case */
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case '?':
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if (*text++ == '\0')
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return FALSE;
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break;
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case '\\':
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ch = *pattern++;
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if (ch == '\0')
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return FALSE;
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/* fall into next case */
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default:
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if (*text == ch) {
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if (*text != '\0')
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text++;
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break;
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}
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if (*text != '\0') {
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pattern = retrypat;
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text = ++retrytext;
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break;
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}
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return FALSE;
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}
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if (pattern == NULL)
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return FALSE;
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}
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return TRUE;
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}
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#endif
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