/* $Id$ */
/**************************************************************************
 *   utils.c                                                              *
 *                                                                        *
 *   Copyright (C) 1999 Chris Allegretta                                  *
 *   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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.            *
 *                                                                        *
 **************************************************************************/

#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "config.h"
#include "nano.h"
#include "proto.h"

#ifndef NANO_SMALL
#include <libintl.h>
#define _(string) gettext(string)
#else
#define _(string) (string)
#endif

/* Lower case a string - must be null terminated */
void lowercase(char *src)
{
    long i = 0;

    while (src[i] != 0) {
	src[i] = (char) tolower(src[i]);
	i++;
    }
}


/* I can't believe I have to write this function */
char *strcasestr(char *haystack, char *needle)
{
    char *localneedle, *localhaystack, *found, *tmp, *tmp2;

    /* Make a copy of the search string and searcgh space */
    localneedle = nmalloc(strlen(needle) + 2);
    localhaystack = nmalloc(strlen(haystack) + 2);

    strcpy(localneedle, needle);
    strcpy(localhaystack, haystack);

    /* Make them lowercase */
    lowercase(localneedle);
    lowercase(localhaystack);

    /* Look for the lowercased substring in the lowercased search space -
       return NULL if we didn't find anything */
    if ((found = strstr(localhaystack, localneedle)) == NULL) {
	free(localneedle);
	free(localhaystack);
	return NULL;
    }
    /* Else return the pointer to the same place in the real search space */
    tmp2 = haystack;
    for (tmp = localhaystack; tmp != found; tmp++)
	tmp2++;

    free(localneedle);
    free(localhaystack);
    return tmp2;
}

char *strstrwrapper(char *haystack, char *needle)
{
#ifdef _POSIX_VERSION
    if (ISSET(USE_REGEXP)) {
      int result=regexec(&search_regexp, haystack, 10, regmatches, 0);
      if (!result)
          return haystack+regmatches[0].rm_so;
      return 0;
    }  
#endif
    if (ISSET(CASE_SENSITIVE))
	return strstr(haystack, needle);
    else
	return strcasestr(haystack, needle);
}

/* Thanks BG, many ppl have been asking for this... */
void *nmalloc(size_t howmuch)
{
    void *r;

    /* Panic save? */

    if (!(r = malloc(howmuch)))
	die(_("nano: malloc: out of memory!"));

    return r;
}

void *nrealloc(void *ptr, size_t howmuch)
{
    void *r;

    if (!(r = realloc(ptr, howmuch)))
	die("nano: realloc: out of memory!");

    return r;
}

/* Append a new magic-line to filebot */
void new_magicline(void) {
    filebot->next = nmalloc(sizeof(filestruct));
    filebot->next->data = nmalloc(1);
    filebot->next->data[0] = '\0';
    filebot->next->prev = filebot;
    filebot->next->next = NULL;
    filebot->next->lineno = filebot->lineno + 1;
    filebot = filebot->next;
    totlines++;
}