claws-mail/src/utils.c

/*
 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
 * Copyright (C) 1999-2001 Hiroyuki Yamamoto
 *
 * 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 of the License, 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.
 */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include "defs.h"

#include <glib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>

#if (HAVE_WCTYPE_H && HAVE_WCHAR_H)
#  include <wchar.h>
#  include <wctype.h>
#endif
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <dirent.h>
#include <time.h>

#include "intl.h"
#include "utils.h"
#include "statusbar.h"
#include "logwindow.h"

#define BUFFSIZE	8192

extern gboolean debug_mode;

static void hash_free_strings_func(gpointer key, gpointer value, gpointer data);

void list_free_strings(GList *list)
{
	list = g_list_first(list);

	while (list != NULL) {
		g_free(list->data);
		list = list->next;
	}
}

void slist_free_strings(GSList *list)
{
	while (list != NULL) {
		g_free(list->data);
		list = list->next;
	}
}

static void hash_free_strings_func(gpointer key, gpointer value, gpointer data)
{
	g_free(key);
}

void hash_free_strings(GHashTable *table)
{
	g_hash_table_foreach(table, hash_free_strings_func, NULL);
}

static void hash_free_value_mem_func(gpointer key, gpointer value,
				     gpointer data)
{
	g_free(value);
}

void hash_free_value_mem(GHashTable *table)
{
	g_hash_table_foreach(table, hash_free_value_mem_func, NULL);
}

void ptr_array_free_strings(GPtrArray *array)
{
	gint i;
	gchar *str;

	g_return_if_fail(array != NULL);

	for (i = 0; i < array->len; i++) {
		str = g_ptr_array_index(array, i);
		g_free(str);
	}
}

gint to_number(const gchar *nstr)
{
	register const gchar *p;

	if (*nstr == '\0') return -1;

	for (p = nstr; *p != '\0'; p++)
		if (!isdigit(*p)) return -1;

	return atoi(nstr);
}

/* convert integer into string,
   nstr must be not lower than 11 characters length */
gchar *itos_buf(gchar *nstr, gint n)
{
	g_snprintf(nstr, 11, "%d", n);
	return nstr;
}

/* convert integer into string */
gchar *itos(gint n)
{
	static gchar nstr[11];

	return itos_buf(nstr, n);
}

gchar *to_human_readable(off_t size)
{
	static gchar str[10];

	if (size < 1024)
		g_snprintf(str, sizeof(str), "%dB", (gint)size);
	else if (size >> 10 < 1024)
		g_snprintf(str, sizeof(str), "%.1fKB", (gfloat)size / (1 << 10));
	else if (size >> 20 < 1024)
		g_snprintf(str, sizeof(str), "%.2fMB", (gfloat)size / (1 << 20));
	else
		g_snprintf(str, sizeof(str), "%.2fGB", (gfloat)size / (1 << 30));

	return str;
}

/* strcmp with NULL-checking */
gint strcmp2(const gchar *s1, const gchar *s2)
{
	if (s1 == NULL || s2 == NULL)
		return -1;
	else
		return strcmp(s1, s2);
}
/* strstr with NULL-checking */
gchar *strstr2(const gchar *s1, const gchar *s2)
{
	if (s1 == NULL || s2 == NULL)
		return NULL;
	else
		return strstr(s1, s2);
}
/* compare paths */
gint path_cmp(const gchar *s1, const gchar *s2)
{
	gint len1, len2;

	if (s1 == NULL || s2 == NULL) return -1;
	if (*s1 == '\0' || *s2 == '\0') return -1;

	len1 = strlen(s1);
	len2 = strlen(s2);

	if (s1[len1 - 1] == G_DIR_SEPARATOR) len1--;
	if (s2[len2 - 1] == G_DIR_SEPARATOR) len2--;

	return strncmp(s1, s2, MAX(len1, len2));
}

/* remove trailing return code */
gchar *strretchomp(gchar *str)
{
	register gchar *s;

	if (!*str) return str;

	for (s = str + strlen(str) - 1;
	     s >= str && (*s == '\n' || *s == '\r');
	     s--)
		*s = '\0';

	return str;
}

/* remove trailing character */
gchar *strtailchomp(gchar *str, gchar tail_char)
{
	register gchar *s;

	if (!*str) return str;
	if (tail_char == '\0') return str;

	for (s = str + strlen(str) - 1; s >= str && *s == tail_char; s--)
		*s = '\0';

	return str;
}


/* Similar to `strstr' but this function ignores the case of both strings.  */
gchar *strcasestr(const gchar *haystack, const gchar *needle)
{
	register size_t haystack_len, needle_len;

	haystack_len = strlen(haystack);
	needle_len   = strlen(needle);

	if (haystack_len < needle_len || needle_len == 0)
		return NULL;

	while (haystack_len >= needle_len) {
		if (!strncasecmp(haystack, needle, needle_len))
			return (gchar *)haystack;
		else {
			haystack++;
			haystack_len--;
		}
	}

	return NULL;
}

/* Copy no more than N characters of SRC to DEST, with NULL terminating.  */
gchar *strncpy2(gchar *dest, const gchar *src, size_t n)
{
	register gchar c;
	gchar *s = dest;

	do {
		if (--n == 0) {
			*dest = '\0';
			return s;
		}
		c = *src++;
		*dest++ = c;
	} while (c != '\0');

	/* don't do zero fill */
	return s;
}

#if !HAVE_ISWALNUM
int iswalnum(wint_t wc)
{
	return isalnum((int)wc);
}
#endif

#if !HAVE_ISWSPACE
int iswspace(wint_t wc)
{
	return isspace((int)wc);
}
#endif

#if !HAVE_TOWLOWER
wint_t towlower(wint_t wc)
{
	if (wc >= L'A' && wc <= L'Z')
		return wc + L'a' - L'A';

	return wc;
}
#endif

#if !HAVE_WCSLEN
size_t wcslen(const wchar_t *s)
{
	size_t len = 0;

	while (*s != L'\0')
		++len, ++s;

	return len;
}
#endif

#if !HAVE_WCSCPY
/* Copy SRC to DEST.  */
wchar_t *wcscpy(wchar_t *dest, const wchar_t *src)
{
	wint_t c;
	wchar_t *s = dest;

	do {
		c = *src++;
		*dest++ = c;
	} while (c != L'\0');

	return s;
}
#endif

#if !HAVE_WCSNCPY
/* Copy no more than N wide-characters of SRC to DEST.  */
wchar_t *wcsncpy (wchar_t *dest, const wchar_t *src, size_t n)
{
	wint_t c;
	wchar_t *s = dest;

	do {
		c = *src++;
		*dest++ = c;
		if (--n == 0)
			return s;
	} while (c != L'\0');

	/* zero fill */
	do
		*dest++ = L'\0';
	while (--n > 0);

	return s;
}
#endif

/* Duplicate S, returning an identical malloc'd string. */
wchar_t *wcsdup(const wchar_t *s)
{
	wchar_t *new_str;

	if (s) {
		new_str = g_new(wchar_t, wcslen(s) + 1);
		wcscpy(new_str, s);
	} else
		new_str = NULL;

	return new_str;
}

/* Duplicate no more than N wide-characters of S,
   returning an identical malloc'd string. */
wchar_t *wcsndup(const wchar_t *s, size_t n)
{
	wchar_t *new_str;

	if (s) {
		new_str = g_new(wchar_t, n + 1);
		wcsncpy(new_str, s, n);
		new_str[n] = (wchar_t)0;
	} else
		new_str = NULL;

	return new_str;
}

wchar_t *strdup_mbstowcs(const gchar *s)
{
	wchar_t *new_str;

	if (s) {
		new_str = g_new(wchar_t, strlen(s) + 1);
		if (mbstowcs(new_str, s, strlen(s) + 1) < 0) {
			g_free(new_str);
			new_str = NULL;
		} else
			new_str = g_realloc(new_str,
					    sizeof(wchar_t) * (wcslen(new_str) + 1));
	} else
		new_str = NULL;

	return new_str;
}

gchar *strdup_wcstombs(const wchar_t *s)
{
	gchar *new_str;
	size_t len;

	if (s) {
		len = wcslen(s) * MB_CUR_MAX + 1;
		new_str = g_new(gchar, len);
		if (wcstombs(new_str, s, len) < 0) {
			g_free(new_str);
			new_str = NULL;
		} else
			new_str = g_realloc(new_str, strlen(new_str) + 1);
	} else
		new_str = NULL;

	return new_str;
}

/* Compare S1 and S2, ignoring case.  */
gint wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n)
{
	wint_t c1;
	wint_t c2;

	while (n--) {
		c1 = towlower(*s1++);
		c2 = towlower(*s2++);
		if (c1 != c2)
			return c1 - c2;
		else if (c1 == 0 && c2 == 0)
			break;
	}

	return 0;
}

/* Find the first occurrence of NEEDLE in HAYSTACK, ignoring case.  */
wchar_t *wcscasestr(const wchar_t *haystack, const wchar_t *needle)
{
	register size_t haystack_len, needle_len;

	haystack_len = wcslen(haystack);
	needle_len   = wcslen(needle);

	if (haystack_len < needle_len || needle_len == 0)
		return NULL;

	while (haystack_len >= needle_len) {
		if (!wcsncasecmp(haystack, needle, needle_len))
			return (wchar_t *)haystack;
		else {
			haystack++;
			haystack_len--;
		}
	}

	return NULL;
}

/* Examine if next block is non-ASCII string */
gboolean is_next_nonascii(const wchar_t *s)
{
	const wchar_t *wp;

	/* skip head space */
	for (wp = s; *wp != (wchar_t)0 && iswspace(*wp); wp++)
		;
	for (; *wp != (wchar_t)0 && !iswspace(*wp); wp++) {
		if (*wp > 127)
			return TRUE;
	}

	return FALSE;
}

/* Examine if next block is multi-byte string */
gboolean is_next_mbs(const wchar_t *s)
{
	gint mbl;
	const wchar_t *wp;
	gchar tmp[MB_LEN_MAX];

	/* skip head space */
	for (wp = s; *wp != (wchar_t)0 && iswspace(*wp); wp++)
		;
	for (; *wp != (wchar_t)0 && !iswspace(*wp); wp++) {
		mbl = wctomb(tmp, *wp);
		if (mbl > 1)
			return TRUE;
	}

	return FALSE;
}

wchar_t *find_wspace(const wchar_t *s)
{
	const wchar_t *wp;

	for (wp = s; *wp != (wchar_t)0 && iswspace(*wp); wp++)
		;
	for (; *wp != (wchar_t)0; wp++) {
		if (iswspace(*wp))
			return (wchar_t *)wp;
	}

	return NULL;
}

/* compare subjects */
gint subject_compare(const gchar *s1, const gchar *s2)
{
	gchar *str1, *str2;

	if (!s1 || !s2) return -1;
	if (!*s1 || !*s2) return -1;

	Xalloca(str1, strlen(s1) + 1, return -1);
	Xalloca(str2, strlen(s2) + 1, return -1);
	strcpy(str1, s1);
	strcpy(str2, s2);

	trim_subject(str1);
	trim_subject(str2);

	if (!*str1 || !*str2) return -1;

	return strcmp(str1, str2);
}

void trim_subject(gchar *str)
{
	gchar *srcp;

	eliminate_parenthesis(str, '[', ']');
	eliminate_parenthesis(str, '(', ')');
	g_strstrip(str);

	while (!strncasecmp(str, "Re:", 3)) {
		srcp = str + 3;
		while (isspace(*srcp)) srcp++;
		memmove(str, srcp, strlen(srcp) + 1);
	}
}

void eliminate_parenthesis(gchar *str, gchar op, gchar cl)
{
	register gchar *srcp, *destp;
	gint in_brace;

	srcp = destp = str;

	while ((destp = strchr(destp, op))) {
		in_brace = 1;
		srcp = destp + 1;
		while (*srcp) {
			if (*srcp == op)
				in_brace++;
			else if (*srcp == cl)
				in_brace--;
			srcp++;
			if (in_brace == 0)
				break;
		}
		while (isspace(*srcp)) srcp++;
		memmove(destp, srcp, strlen(srcp) + 1);
	}
}

void extract_parenthesis(gchar *str, gchar op, gchar cl)
{
	register gchar *srcp, *destp;
	gint in_brace;

	srcp = destp = str;

	while ((srcp = strchr(destp, op))) {
		if (destp > str)
			*destp++ = ' ';
		memmove(destp, srcp + 1, strlen(srcp));
		in_brace = 1;
		while(*destp) {
			if (*destp == op)
				in_brace++;
			else if (*destp == cl)
				in_brace--;

			if (in_brace == 0)
				break;

			destp++;
		}
	}
	*destp = '\0';
}

void extract_one_parenthesis_with_skip_quote(gchar *str, gchar quote_chr,
					     gchar op, gchar cl)
{
	register gchar *srcp, *destp;
	gint in_brace;
	gboolean in_quote = FALSE;

	srcp = destp = str;

	if ((srcp = strchr_with_skip_quote(destp, quote_chr, op))) {
		memmove(destp, srcp + 1, strlen(srcp));
		in_brace = 1;
		while(*destp) {
			if (*destp == op && !in_quote)
				in_brace++;
			else if (*destp == cl && !in_quote)
				in_brace--;
			else if (*destp == quote_chr)
				in_quote ^= TRUE;

			if (in_brace == 0)
				break;

			destp++;
		}
	}
	*destp = '\0';
}

void extract_parenthesis_with_skip_quote(gchar *str, gchar quote_chr,
					 gchar op, gchar cl)
{
	register gchar *srcp, *destp;
	gint in_brace;
	gboolean in_quote = FALSE;

	srcp = destp = str;

	while ((srcp = strchr_with_skip_quote(destp, quote_chr, op))) {
		if (destp > str)
			*destp++ = ' ';
		memmove(destp, srcp + 1, strlen(srcp));
		in_brace = 1;
		while(*destp) {
			if (*destp == op && !in_quote)
				in_brace++;
			else if (*destp == cl && !in_quote)
				in_brace--;
			else if (*destp == quote_chr)
				in_quote ^= TRUE;

			if (in_brace == 0)
				break;

			destp++;
		}
	}
	*destp = '\0';
}

void eliminate_quote(gchar *str, gchar quote_chr)
{
	register gchar *srcp, *destp;

	srcp = destp = str;

	while ((destp = strchr(destp, quote_chr))) {
		if ((srcp = strchr(destp + 1, quote_chr))) {
			srcp++;
			while (isspace(*srcp)) srcp++;
			memmove(destp, srcp, strlen(srcp) + 1);
		} else {
			*destp = '\0';
			break;
		}
	}
}

void extract_quote(gchar *str, gchar quote_chr)
{
	register gchar *p, *p2;

	if ((str = strchr(str, quote_chr))) {
		p2 = str;
		while ((p = strchr(p2 + 1, quote_chr)) && (p[-1] == '\\')) {
			memmove(p - 1, p, strlen(p) + 1);
			p2 = p - 1;
		}
		if(p) {
			*p = '\0';
			memmove(str, str + 1, p - str);
		}
	}
}

void eliminate_address_comment(gchar *str)
{
	register gchar *srcp, *destp;
	gint in_brace;

	srcp = destp = str;

	while ((destp = strchr(destp, '"'))) {
		if ((srcp = strchr(destp + 1, '"'))) {
			srcp++;
			if (*srcp == '@') {
				destp = srcp + 1;
			} else {
				while (isspace(*srcp)) srcp++;
				memmove(destp, srcp, strlen(srcp) + 1);
			}
		} else {
			*destp = '\0';
			break;
		}
	}

	srcp = destp = str;

	while ((destp = strchr_with_skip_quote(destp, '"', '('))) {
		in_brace = 1;
		srcp = destp + 1;
		while (*srcp) {
			if (*srcp == '(')
				in_brace++;
			else if (*srcp == ')')
				in_brace--;
			srcp++;
			if (in_brace == 0)
				break;
		}
		while (isspace(*srcp)) srcp++;
		memmove(destp, srcp, strlen(srcp) + 1);
	}
}

gchar *strchr_with_skip_quote(const gchar *str, gint quote_chr, gint c)
{
	gboolean in_quote = FALSE;

	while (*str) {
		if (*str == c && !in_quote)
			return (gchar *)str;
		if (*str == quote_chr)
			in_quote ^= TRUE;
		str++;
	}

	return NULL;
}

gchar *strrchr_with_skip_quote(const gchar *str, gint quote_chr, gint c)
{
	gboolean in_quote = FALSE;
	const gchar *p;

	p = str + strlen(str) - 1;
	while (p >= str) {
		if (*p == c && !in_quote)
			return (gchar *)p;
		if (*p == quote_chr)
			in_quote ^= TRUE;
		p--;
	}

	return NULL;
}

void extract_address(gchar *str)
{
	eliminate_address_comment(str);
	if (strchr_with_skip_quote(str, '"', '<'))
		extract_parenthesis_with_skip_quote(str, '"', '<', '>');
	g_strstrip(str);
}

GSList *address_list_append(GSList *addr_list, const gchar *str)
{
	gchar *work;
	gchar *workp;

	if (!str) return addr_list;

	Xstrdup_a(work, str, return addr_list);

	eliminate_address_comment(work);
	workp = work;

	while (workp && *workp) {
		gchar *p, *next;

		if ((p = strchr_with_skip_quote(workp, '"', ','))) {
			*p = '\0';
			next = p + 1;
		} else
			next = NULL;

		if (strchr_with_skip_quote(workp, '"', '<'))
			extract_parenthesis_with_skip_quote
				(workp, '"', '<', '>');

		g_strstrip(workp);
		if (*workp)
			addr_list = g_slist_append(addr_list, g_strdup(workp));

		workp = next;
	}

	return addr_list;
}

GSList *references_list_append(GSList *msgid_list, const gchar *str)
{
	const gchar *strp;

	if (!str) return msgid_list;
	strp = str;

	while (strp && *strp) {
		const gchar *start, *end;
		gchar *msgid;

		if ((start = strchr(strp, '<')) != NULL) {
			end = strchr(start + 1, '>');
			if (!end) break;
		} else
			break;

		msgid = g_strndup(start + 1, end - start - 1);
		g_strstrip(msgid);
		if (*msgid)
			msgid_list = g_slist_append(msgid_list, msgid);
		else
			g_free(msgid);

		strp = end + 1;
	}

	return msgid_list;
}

GSList *newsgroup_list_append(GSList *group_list, const gchar *str)
{
	gchar *work;
	gchar *workp;

	if (!str) return group_list;

	Xstrdup_a(work, str, return group_list);

	workp = work;

	while (workp && *workp) {
		gchar *p, *next;

		if ((p = strchr_with_skip_quote(workp, '"', ','))) {
			*p = '\0';
			next = p + 1;
		} else
			next = NULL;

		g_strstrip(workp);
		if (*workp)
			group_list = g_slist_append(group_list,
						    g_strdup(workp));

		workp = next;
	}

	return group_list;
}

void remove_return(gchar *str)
{
	register gchar *p = str;

	while (*p) {
		if (*p == '\n' || *p == '\r')
			memmove(p, p + 1, strlen(p));
		else
			p++;
	}
}

void remove_space(gchar *str)
{
	register gchar *p = str;
	register gint spc;

	while (*p) {
		spc = 0;
		while (isspace(*(p + spc)))
			spc++;
		if (spc)
			memmove(p, p + spc, strlen(p + spc) + 1);
		else
			p++;
	}
}

void unfold_line(gchar *str)
{
	register gchar *p = str;
	register gint spc;

	while (*p) {
		if (*p == '\n' || *p == '\r') {
			*p++ = ' ';
			spc = 0;
			while (isspace(*(p + spc)))
				spc++;
			if (spc)
				memmove(p, p + spc, strlen(p + spc) + 1);
		} else
			p++;
	}
}

void subst_char(gchar *str, gchar orig, gchar subst)
{
	register gchar *p = str;

	while (*p) {
		if (*p == orig)
			*p = subst;
		p++;
	}
}

gboolean is_header_line(const gchar *str)
{
	if (str[0] == ':') return FALSE;

	while (*str != '\0' && *str != ' ') {
		if (*str == ':')
			return TRUE;
		str++;
	}

	return FALSE;
}

gboolean is_ascii_str(const guchar *str)
{
	while (*str != '\0') {
		if (*str != '\t' && *str != ' ' &&
		    *str != '\r' && *str != '\n' &&
		    (*str < 32 || *str >= 127))
			return FALSE;
		str++;
	}

	return TRUE;
}

gint get_quote_level(const gchar *str)
{
	const gchar *first_pos;
	const gchar *last_pos;
	const gchar *p = str;
	gint quote_level = -1;

	/* speed up line processing by only searching to the last '>' */
	if ((first_pos = strchr(str, '>')) != NULL) {
		/* skip a line if it contains a '<' before the initial '>' */
		if (memchr(str, '<', first_pos - str) != NULL)
			return -1;
		last_pos = strrchr(first_pos, '>');
	} else
		return -1;

	while (p <= last_pos) {
		while (p < last_pos) {
			if (isspace(*p))
				p++;
			else
				break;
		}

		if (*p == '>')
			quote_level++;
		else if (*p != '-' && !isspace(*p) && p <= last_pos) {
			/* any characters are allowed except '-' and space */
			while (*p != '-' && *p != '>' && !isspace(*p) &&
			       p < last_pos)
				p++;
			if (*p == '>')
				quote_level++;
			else
				break;
		}

		p++;
	}

	return quote_level;
}

GList *uri_list_extract_filenames(const gchar *uri_list)
{
	GList *result = NULL;
	const gchar *p, *q;
	gchar *file;

	p = uri_list;

	while (p) {
		if (*p != '#') {
			while (isspace(*p)) p++;
			if (!strncmp(p, "file:", 5)) {
				p += 5;
				q = p;
				while (*q && *q != '\n' && *q != '\r') q++;

				if (q > p) {
					q--;
					while (q > p && isspace(*q)) q--;
					file = g_malloc(q - p + 2);
					strncpy(file, p, q - p + 1);
					file[q - p + 1] = '\0';
					result = g_list_append(result,file);
				}
			}
		}
		p = strchr(p, '\n');
		if (p) p++;
	}

	return result;
}

gchar *strstr_with_skip_quote(const gchar *haystack, const gchar *needle)
{
	register guint haystack_len, needle_len;
	gboolean in_squote = FALSE, in_dquote = FALSE;

	haystack_len = strlen(haystack);
	needle_len   = strlen(needle);

	if (haystack_len < needle_len || needle_len == 0)
		return NULL;

	while (haystack_len >= needle_len) {
		if (!in_squote && !in_dquote &&
		    !strncmp(haystack, needle, needle_len))
			return (gchar *)haystack;

		/* 'foo"bar"' -> foo"bar"
		   "foo'bar'" -> foo'bar' */
		if (*haystack == '\'') {
			if (in_squote)
				in_squote = FALSE;
			else if (!in_dquote)
				in_squote = TRUE;
		} else if (*haystack == '\"') {
			if (in_dquote)
				in_dquote = FALSE;
			else if (!in_squote)
				in_dquote = TRUE;
		}

		haystack++;
		haystack_len--;
	}

	return NULL;
}

/* this fuction was taken from gstrfuncs.c in glib. */
gchar **strsplit_with_quote(const gchar *str, const gchar *delim,
			    gint max_tokens)
{
	GSList *string_list = NULL, *slist;
	gchar **str_array, *s;
	guint i, n = 1;

	g_return_val_if_fail(str != NULL, NULL);
	g_return_val_if_fail(delim != NULL, NULL);

	if (max_tokens < 1)
		max_tokens = G_MAXINT;

	s = strstr_with_skip_quote(str, delim);
	if (s) {
		guint delimiter_len = strlen(delim);

		do {
			guint len;
			gchar *new_str;

			len = s - str;
			new_str = g_new(gchar, len + 1);
			strncpy(new_str, str, len);
			new_str[len] = 0;
			string_list = g_slist_prepend(string_list, new_str);
			n++;
			str = s + delimiter_len;
			s = strstr_with_skip_quote(str, delim);
		} while (--max_tokens && s);
	}

	if (*str) {
		n++;
		string_list = g_slist_prepend(string_list, g_strdup(str));
	}

	str_array = g_new(gchar*, n);

	i = n - 1;

	str_array[i--] = NULL;
	for (slist = string_list; slist; slist = slist->next)
		str_array[i--] = slist->data;

	g_slist_free(string_list);

	return str_array;
}

/*
 * We need this wrapper around g_get_home_dir(), so that
 * we can fix some Windoze things here.  Should be done in glibc of course
 * but as long as we are not able to do our own extensions to glibc, we do 
 * it here.
 */
gchar *get_home_dir(void)
{
#if HAVE_DOSISH_SYSTEM
    static gchar *home_dir;

    if (!home_dir) {
        home_dir = read_w32_registry_string(NULL,
                                            "Software\\Sylpheed", "HomeDir" );
        if (!home_dir || !*home_dir) {
            if (getenv ("HOMEDRIVE") && getenv("HOMEPATH")) {
                const char *s = g_get_home_dir();
                if (s && *s)
                    home_dir = g_strdup (s);
            }
            if (!home_dir || !*home_dir) 
                home_dir = g_strdup ("c:\\sylpheed");
        }
        debug_print("initialized home_dir to `%s'\n", home_dir);
    }
    return home_dir;
#else /* standard glib */
    return g_get_home_dir();
#endif
}

gchar *get_rc_dir(void)
{
	static gchar *rc_dir = NULL;

	if (!rc_dir)
		rc_dir = g_strconcat(get_home_dir(), G_DIR_SEPARATOR_S,
				     RC_DIR, NULL);

	return rc_dir;
}

gchar *get_news_cache_dir(void)
{
	static gchar *news_cache_dir = NULL;

	if (!news_cache_dir)
		news_cache_dir = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
					     NEWS_CACHE_DIR, NULL);

	return news_cache_dir;
}

gchar *get_imap_cache_dir(void)
{
	static gchar *imap_cache_dir = NULL;

	if (!imap_cache_dir)
		imap_cache_dir = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
					     IMAP_CACHE_DIR, NULL);

	return imap_cache_dir;
}

gchar *get_mbox_cache_dir(void)
{
	static gchar *mbox_cache_dir = NULL;

	if (!mbox_cache_dir)
		mbox_cache_dir = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
					     MBOX_CACHE_DIR, NULL);

	return mbox_cache_dir;
}

gchar *get_mime_tmp_dir(void)
{
	static gchar *mime_tmp_dir = NULL;

	if (!mime_tmp_dir)
		mime_tmp_dir = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
					   MIME_TMP_DIR, NULL);

	return mime_tmp_dir;
}

gchar *get_tmp_file(void)
{
	static gchar *tmp_file = NULL;

	if (!tmp_file)
		tmp_file = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
				       "tmpfile", NULL);

	return tmp_file;
}

gchar *get_domain_name(void)
{
	static gchar *domain_name = NULL;

	if (!domain_name) {
		gchar buf[BUFFSIZE] = "";

		if (gethostname(buf, sizeof(buf)) < 0) {
			perror("gethostname");
			strcpy(buf, "unknown");
		}

		domain_name = g_strdup(buf);
	}

	return domain_name;
}

off_t get_file_size(const gchar *file)
{
	struct stat s;

	if (stat(file, &s) < 0) {
		FILE_OP_ERROR(file, "stat");
		return -1;
	}

	return s.st_size;
}

off_t get_left_file_size(FILE *fp)
{
	glong pos;
	glong end;
	off_t size;

	if ((pos = ftell(fp)) < 0) {
		perror("ftell");
		return -1;
	}
	if (fseek(fp, 0L, SEEK_END) < 0) {
		perror("fseek");
		return -1;
	}
	if ((end = ftell(fp)) < 0) {
		perror("fseek");
		return -1;
	}
	size = end - pos;
	if (fseek(fp, pos, SEEK_SET) < 0) {
		perror("fseek");
		return -1;
	}

	return size;
}

gboolean file_exist(const gchar *file, gboolean allow_fifo)
{
	struct stat s;

	if (stat(file, &s) < 0) {
		if (ENOENT != errno) FILE_OP_ERROR(file, "stat");
		return FALSE;
	}

	if (S_ISREG(s.st_mode) || (allow_fifo && S_ISFIFO(s.st_mode)))
		return TRUE;

	return FALSE;
}

gboolean is_dir_exist(const gchar *dir)
{
	struct stat s;

	if (stat(dir, &s) < 0) {
		if (ENOENT != errno) FILE_OP_ERROR(dir, "stat");
		return FALSE;
	}

	if (S_ISDIR(s.st_mode))
		return TRUE;

	return FALSE;
}

gint change_dir(const gchar *dir)
{
	gchar *prevdir = NULL;

	if (debug_mode)
		prevdir = g_get_current_dir();

	if (chdir(dir) < 0) {
		FILE_OP_ERROR(dir, "chdir");
		if (debug_mode) g_free(prevdir);
		return -1;
	} else if (debug_mode) {
		gchar *cwd;

		cwd = g_get_current_dir();
		if (strcmp(prevdir, cwd) != 0)
			g_print("current dir: %s\n", cwd);
		g_free(cwd);
		g_free(prevdir);
	}

	return 0;
}

gint make_dir_hier(const gchar *dir)
{
	gchar *parent_dir;
	const gchar *p;

	for (p = dir; (p = strchr(p, G_DIR_SEPARATOR)) != NULL; p++) {
		parent_dir = g_strndup(dir, p - dir);
		if (*parent_dir != '\0') {
			if (!is_dir_exist(parent_dir)) {
				if (mkdir(parent_dir, S_IRWXU) < 0) {
					FILE_OP_ERROR(parent_dir, "mkdir");
					g_free(parent_dir);
					return -1;
				}
				if (chmod(parent_dir, S_IRWXU) < 0)
					FILE_OP_ERROR(parent_dir, "chmod");
			}
		}
		g_free(parent_dir);
	}
	if (!is_dir_exist(dir)) {
		if (mkdir(dir, S_IRWXU) < 0) {
			FILE_OP_ERROR(dir, "mkdir");
			return -1;
		}
		if (chmod(dir, S_IRWXU) < 0)
			FILE_OP_ERROR(dir, "chmod");
	}

	return 0;
}

gint remove_all_files(const gchar *dir)
{
	DIR *dp;
	struct dirent *d;
	gchar *prev_dir;

	prev_dir = g_get_current_dir();

	if (chdir(dir) < 0) {
		FILE_OP_ERROR(dir, "chdir");
		return -1;
	}

	if ((dp = opendir(".")) == NULL) {
		FILE_OP_ERROR(dir, "opendir");
		return -1;
	}

	while ((d = readdir(dp)) != NULL) {
		if (!strcmp(d->d_name, ".") ||
		    !strcmp(d->d_name, ".."))
			continue;

		if (unlink(d->d_name) < 0)
			FILE_OP_ERROR(d->d_name, "unlink");
	}

	closedir(dp);

	if (chdir(prev_dir) < 0) {
		FILE_OP_ERROR(prev_dir, "chdir");
		g_free(prev_dir);
		return -1;
	}

	g_free(prev_dir);

	return 0;
}

gint remove_numbered_files(const gchar *dir, guint first, guint last)
{
	DIR *dp;
	struct dirent *d;
	gchar *prev_dir;
	gint fileno;

	prev_dir = g_get_current_dir();

	if (chdir(dir) < 0) {
		FILE_OP_ERROR(dir, "chdir");
		return -1;
	}

	if ((dp = opendir(".")) == NULL) {
		FILE_OP_ERROR(dir, "opendir");
		return -1;
	}

	while ((d = readdir(dp)) != NULL) {
		fileno = to_number(d->d_name);
		if (fileno >= 0 && first <= fileno && fileno <= last) {
			if (unlink(d->d_name) < 0)
				FILE_OP_ERROR(d->d_name, "unlink");
		}
	}

	closedir(dp);

	if (chdir(prev_dir) < 0) {
		FILE_OP_ERROR(prev_dir, "chdir");
		g_free(prev_dir);
		return -1;
	}

	g_free(prev_dir);

	return 0;
}

gint remove_all_numbered_files(const gchar *dir)
{
	return remove_numbered_files(dir, 0, UINT_MAX);
}

gint remove_dir_recursive(const gchar *dir)
{
	struct stat s;
	DIR *dp;
	struct dirent *d;
	gchar *prev_dir;

	/* g_print("dir = %s\n", dir); */

	if (stat(dir, &s) < 0) {
		FILE_OP_ERROR(dir, "stat");
		if (ENOENT == errno) return 0;
		return -1;
	}

	if (!S_ISDIR(s.st_mode)) {
		if (unlink(dir) < 0) {
			FILE_OP_ERROR(dir, "unlink");
			return -1;
		}

		return 0;
	}

	prev_dir = g_get_current_dir();
	/* g_print("prev_dir = %s\n", prev_dir); */

	if (!path_cmp(prev_dir, dir)) {
		g_free(prev_dir);
		if (chdir("..") < 0) {
			FILE_OP_ERROR(dir, "chdir");
			return -1;
		}
		prev_dir = g_get_current_dir();
	}

	if (chdir(dir) < 0) {
		FILE_OP_ERROR(dir, "chdir");
		g_free(prev_dir);
		return -1;
	}

	if ((dp = opendir(".")) == NULL) {
		FILE_OP_ERROR(dir, "opendir");
		chdir(prev_dir);
		g_free(prev_dir);
		return -1;
	}

	/* remove all files in the directory */
	while ((d = readdir(dp)) != NULL) {
		if (!strcmp(d->d_name, ".") ||
		    !strcmp(d->d_name, ".."))
			continue;

		if (stat(d->d_name, &s) < 0) {
			FILE_OP_ERROR(d->d_name, "stat");
			continue;
		}

		/* g_print("removing %s\n", d->d_name); */

		if (S_ISDIR(s.st_mode)) {
			if (remove_dir_recursive(d->d_name) < 0) {
				g_warning("can't remove directory\n");
				return -1;
			}
		} else {
			if (unlink(d->d_name) < 0)
				FILE_OP_ERROR(d->d_name, "unlink");
		}
	}

	closedir(dp);

	if (chdir(prev_dir) < 0) {
		FILE_OP_ERROR(prev_dir, "chdir");
		g_free(prev_dir);
		return -1;
	}

	g_free(prev_dir);

	if (rmdir(dir) < 0) {
		FILE_OP_ERROR(dir, "rmdir");
		return -1;
	}

	return 0;
}

#if 0
/* this seems to be slower than the stdio version... */
gint copy_file(const gchar *src, const gchar *dest)
{
	gint src_fd, dest_fd;
	gint n_read;
	gint n_write;
	gchar buf[BUFSIZ];
	gchar *dest_bak = NULL;

	if ((src_fd = open(src, O_RDONLY)) < 0) {
		FILE_OP_ERROR(src, "open");
		return -1;
	}

	if (is_file_exist(dest)) {
		dest_bak = g_strconcat(dest, ".bak", NULL);
		if (rename(dest, dest_bak) < 0) {
			FILE_OP_ERROR(dest, "rename");
			close(src_fd);
			g_free(dest_bak);
			return -1;
		}
	}

	if ((dest_fd = open(dest, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR)) < 0) {
		FILE_OP_ERROR(dest, "open");
		close(src_fd);
		if (dest_bak) {
			if (rename(dest_bak, dest) < 0)
				FILE_OP_ERROR(dest_bak, "rename");
			g_free(dest_bak);
		}
		return -1;
	}

	while ((n_read = read(src_fd, buf, sizeof(buf))) > 0) {
		gint len = n_read;
		gchar *bufp = buf;

		while (len > 0) {
			n_write = write(dest_fd, bufp, len);
			if (n_write <= 0) {
				g_warning(_("writing to %s failed.\n"), dest);
				close(dest_fd);
				close(src_fd);
				unlink(dest);
				if (dest_bak) {
					if (rename(dest_bak, dest) < 0)
						FILE_OP_ERROR(dest_bak, "rename");
					g_free(dest_bak);
				}
				return -1;
			}
			len -= n_write;
			bufp += n_write;
		}
	}

	close(src_fd);
	close(dest_fd);

	if (n_read < 0 || get_file_size(src) != get_file_size(dest)) {
		g_warning(_("File copy from %s to %s failed.\n"), src, dest);
		unlink(dest);
		if (dest_bak) {
			if (rename(dest_bak, dest) < 0)
				FILE_OP_ERROR(dest_bak, "rename");
			g_free(dest_bak);
		}
		return -1;
	}
	g_free(dest_bak);

	return 0;
}
#endif

gint copy_file(const gchar *src, const gchar *dest)
{
	FILE *src_fp, *dest_fp;
	gint n_read;
	gchar buf[BUFSIZ];
	gchar *dest_bak = NULL;
	gboolean err = FALSE;

	if ((src_fp = fopen(src, "r")) == NULL) {
		FILE_OP_ERROR(src, "fopen");
		return -1;
	}
	if (is_file_exist(dest)) {
		dest_bak = g_strconcat(dest, ".bak", NULL);
		if (rename(dest, dest_bak) < 0) {
			FILE_OP_ERROR(dest, "rename");
			fclose(src_fp);
			g_free(dest_bak);
			return -1;
		}
	}

	if ((dest_fp = fopen(dest, "w")) == NULL) {
		FILE_OP_ERROR(dest, "fopen");
		fclose(src_fp);
		if (dest_bak) {
			if (rename(dest_bak, dest) < 0)
				FILE_OP_ERROR(dest_bak, "rename");
			g_free(dest_bak);
		}
		return -1;
	}

	if (change_file_mode_rw(dest_fp, dest) < 0) {
		FILE_OP_ERROR(dest, "chmod");
		g_warning(_("can't change file mode\n"));
	}

	while ((n_read = fread(buf, sizeof(gchar), sizeof(buf), src_fp)) > 0) {
		if (n_read < sizeof(buf) && ferror(src_fp))
			break;
		if (fwrite(buf, n_read, 1, dest_fp) < 1) {
			g_warning(_("writing to %s failed.\n"), dest);
			fclose(dest_fp);
			fclose(src_fp);
			unlink(dest);
			if (dest_bak) {
				if (rename(dest_bak, dest) < 0)
					FILE_OP_ERROR(dest_bak, "rename");
				g_free(dest_bak);
			}
			return -1;
		}
	}

	if (ferror(src_fp)) {
		FILE_OP_ERROR(src, "fread");
		err = TRUE;
	}
	fclose(src_fp);
	if (fclose(dest_fp) == EOF) {
		FILE_OP_ERROR(dest, "fclose");
		err = TRUE;
	}

	if (err) {
		unlink(dest);
		if (dest_bak) {
			if (rename(dest_bak, dest) < 0)
				FILE_OP_ERROR(dest_bak, "rename");
			g_free(dest_bak);
		}
		return -1;
	}

	g_free(dest_bak);

	return 0;
}

gint move_file(const gchar *src, const gchar *dest)
{
	if (is_file_exist(dest)) {
		g_warning(_("move_file(): file %s already exists."), dest);
		return -1;
	}

	if (rename(src, dest) == 0) return 0;

	if (EXDEV != errno) {
		FILE_OP_ERROR(src, "rename");
		return -1;
	}

	if (copy_file(src, dest) < 0) return -1;

	unlink(src);

	return 0;
}

gint change_file_mode_rw(FILE *fp, const gchar *file)
{
#if HAVE_FCHMOD
	return fchmod(fileno(fp), S_IRUSR|S_IWUSR);
#else
	return chmod(file, S_IRUSR|S_IWUSR);
#endif
}

FILE *my_tmpfile(void)
{
#if HAVE_MKSTEMP
	const gchar suffix[] = ".XXXXXX";
	const gchar *tmpdir;
	guint tmplen;
	const gchar *progname;
	guint proglen;
	gchar *fname;
	gint fd;
	FILE *fp;

	tmpdir = g_get_tmp_dir();
	tmplen = strlen(tmpdir);
	progname = g_get_prgname();
	proglen = strlen(progname);
	Xalloca(fname, tmplen + 1 + proglen + sizeof(suffix),
		return tmpfile());

	memcpy(fname, tmpdir, tmplen);
	fname[tmplen] = G_DIR_SEPARATOR;
	memcpy(fname + tmplen + 1, progname, proglen);
	memcpy(fname + tmplen + 1 + proglen, suffix, sizeof(suffix));

	fd = mkstemp(fname);
	if (fd < 0)
		return tmpfile();

	unlink(fname);

	fp = fdopen(fd, "w+b");
	if (!fp)
		close(fd);
	else
		return fp;
#endif /* HAVE_MKSTEMP */

	return tmpfile();
}

gint execute_async(gchar *const argv[])
{
	pid_t pid;

	if ((pid = fork()) < 0) {
		perror("fork");
		return -1;
	}

	if (pid == 0) {			/* child process */
		pid_t gch_pid;

		if ((gch_pid = fork()) < 0) {
			perror("fork");
			_exit(1);
		}

		if (gch_pid == 0) {	/* grandchild process */
			execvp(argv[0], argv);

			perror("execvp");
			_exit(1);
		}

		_exit(0);
	}

	waitpid(pid, NULL, 0);

	return 0;
}

gint execute_sync(gchar *const argv[])
{
	pid_t pid;

	if ((pid = fork()) < 0) {
		perror("fork");
		return -1;
	}

	if (pid == 0) {		/* child process */
		execvp(argv[0], argv);

		perror("execvp");
		_exit(1);
	}

	waitpid(pid, NULL, 0);

	return 0;
}

gint execute_command_line(const gchar *cmdline, gboolean async)
{
	gchar **argv;
	gint i;
	gint ret;

	argv = strsplit_with_quote(cmdline, " ", 0);

	for (i = 0; argv[i] != NULL; i++) {
		gchar *str = argv[i];

		if (str[0] == '\'' || str[0] == '\"') {
			gint len;

			len = strlen(str);
			if (str[len - 1] == str[0]) {
				str[len - 1] = '\0';
				memmove(str, str + 1, len - 1);
			}
		}
	}

	if (async)
		ret = execute_async(argv);
	else
		ret = execute_sync(argv);
	g_strfreev(argv);

	return ret;
}

static gint is_unchanged_uri_char(char c)
{
	switch (c) {
		case '(':
		case ')':
		case ',':
			return 0;
		default:
			return 1;
	}
}

void encode_uri(gchar *encoded_uri, gint bufsize, const gchar *uri)
{
	int i;
	int k;

	k = 0;
	for(i = 0; i < strlen(uri) ; i++) {
		if (is_unchanged_uri_char(uri[i])) {
			if (k + 2 >= bufsize)
				break;
			encoded_uri[k++] = uri[i];
		}
		else {
			char * hexa = "0123456789ABCDEF";
			
			if (k + 4 >= bufsize)
				break;
			encoded_uri[k++] = '%';
			encoded_uri[k++] = hexa[uri[i] / 16];
			encoded_uri[k++] = hexa[uri[i] % 16];
		}
	}
	encoded_uri[k] = 0;
}

/* Converts two-digit hexadecimal to decimal.  Used for unescaping escaped 
 * characters
 */
static gint axtoi(const gchar *hexstr)
{
	gint hi, lo, result;
       
	hi = hexstr[0];
	if ('0' <= hi && hi <= '9') {
		hi -= '0';
	} else
		if ('a' <= hi && hi <= 'f') {
			hi -= ('a' - 10);
		} else
			if ('A' <= hi && hi <= 'F') {
				hi -= ('A' - 10);
			}

	lo = hexstr[1];
	if ('0' <= lo && lo <= '9') {
		lo -= '0';
	} else
		if ('a' <= lo && lo <= 'f') {
			lo -= ('a'-10);
		} else
			if ('A' <= lo && lo <= 'F') {
				lo -= ('A' - 10);
			}
	result = lo + (16 * hi);
	return result;
}


/* Decodes URL-Encoded strings (i.e. strings in which spaces are replaced by
 * plusses, and escape characters are used)
 */

void decode_uri(gchar *decoded_uri, const gchar *encoded_uri)
{
	const gchar *encoded;
	gchar *decoded;

	encoded = encoded_uri;
	decoded = decoded_uri;

	while (*encoded) {
		if (*encoded == '%') {
			encoded++;
			if (isxdigit(encoded[0])
			    && isxdigit(encoded[1])) {
				*decoded = (gchar) axtoi(encoded);
				decoded++;
				encoded += 2;
			}
		}
		else if (*encoded == '+') {
			*decoded = ' ';
			decoded++;
			encoded++;
		}
		else {
			*decoded = *encoded;
			decoded++;
			encoded++;
		}
	}

	*decoded = '\0';
}


gint open_uri(const gchar *uri, const gchar *cmdline)
{
	static gchar *default_cmdline = "netscape -remote openURL(%s,raise)";
	gchar buf[BUFFSIZE];
	gchar *p;
	gchar encoded_uri[BUFFSIZE];
	
	g_return_val_if_fail(uri != NULL, -1);

	/* an option to choose whether to use encode_uri or not ? */
	encode_uri(encoded_uri, BUFFSIZE, uri);
	
	if (cmdline &&
	    (p = strchr(cmdline, '%')) && *(p + 1) == 's' &&
	    !strchr(p + 2, '%'))
		g_snprintf(buf, sizeof(buf), cmdline, encoded_uri);
	else {
		if (cmdline)
			g_warning(_("Open URI command line is invalid: `%s'"),
				  cmdline);
		g_snprintf(buf, sizeof(buf), default_cmdline, encoded_uri);
	}
	
	execute_command_line(buf, TRUE);

	return 0;
}

time_t remote_tzoffset_sec(const gchar *zone)
{
	static gchar ustzstr[] = "PSTPDTMSTMDTCSTCDTESTEDT";
	gchar zone3[4];
	gchar *p;
	gchar c;
	gint iustz;
	gint h, m;
	time_t remoteoffset;

	strncpy(zone3, zone, 3);
	zone3[3] = '\0';
	remoteoffset = 0;

	if (sscanf(zone, "%c%2d%2d", &c, &h, &m) == 3 &&
	    (c == '+' || c == '-')) {
		remoteoffset = ((h * 60) + m) * 60;
		if (c == '-')
			remoteoffset = -remoteoffset;
	} else if (!strncmp(zone, "UT" , 2) ||
		   !strncmp(zone, "GMT", 2)) {
		remoteoffset = 0;
	} else if (strlen(zone3) == 3 &&
		   (p = strstr(ustzstr, zone3)) != NULL &&
		   (p - ustzstr) % 3 == 0) {
		iustz = ((gint)(p - ustzstr) / 3 + 1) / 2 - 8;
		remoteoffset = iustz * 3600;
	} else if (strlen(zone3) == 1) {
		switch (zone[0]) {
		case 'Z': remoteoffset =   0; break;
		case 'A': remoteoffset =  -1; break;
		case 'B': remoteoffset =  -2; break;
		case 'C': remoteoffset =  -3; break;
		case 'D': remoteoffset =  -4; break;
		case 'E': remoteoffset =  -5; break;
		case 'F': remoteoffset =  -6; break;
		case 'G': remoteoffset =  -7; break;
		case 'H': remoteoffset =  -8; break;
		case 'I': remoteoffset =  -9; break;
		case 'K': remoteoffset = -10; break; /* J is not used */
		case 'L': remoteoffset = -11; break;
		case 'M': remoteoffset = -12; break;
		case 'N': remoteoffset =   1; break;
		case 'O': remoteoffset =   2; break;
		case 'P': remoteoffset =   3; break;
		case 'Q': remoteoffset =   4; break;
		case 'R': remoteoffset =   5; break;
		case 'S': remoteoffset =   6; break;
		case 'T': remoteoffset =   7; break;
		case 'U': remoteoffset =   8; break;
		case 'V': remoteoffset =   9; break;
		case 'W': remoteoffset =  10; break;
		case 'X': remoteoffset =  11; break;
		case 'Y': remoteoffset =  12; break;
		default:  remoteoffset =   0; break;
		}
		remoteoffset = remoteoffset * 3600;
	}

	return remoteoffset;
}

time_t tzoffset_sec(time_t *now)
{
	struct tm gmt, *lt;
	gint off;

	gmt = *gmtime(now);
	lt = localtime(now);

	off = (lt->tm_hour - gmt.tm_hour) * 60 + lt->tm_min - gmt.tm_min;

	if (lt->tm_year < gmt.tm_year)
		off -= 24 * 60;
	else if (lt->tm_year > gmt.tm_year)
		off += 24 * 60;
	else if (lt->tm_yday < gmt.tm_yday)
		off -= 24 * 60;
	else if (lt->tm_yday > gmt.tm_yday)
		off += 24 * 60;

	if (off >= 24 * 60)		/* should be impossible */
		off = 23 * 60 + 59;	/* if not, insert silly value */
	if (off <= -24 * 60)
		off = -(23 * 60 + 59);
	if (off > 12 * 60)
		off -= 24 * 60;
	if (off < -12 * 60)
		off += 24 * 60;

	return off * 60;
}

/* calculate timezone offset */
gchar *tzoffset(time_t *now)
{
	static gchar offset_string[6];
	struct tm gmt, *lt;
	gint off;
	gchar sign = '+';

	gmt = *gmtime(now);
	lt = localtime(now);

	off = (lt->tm_hour - gmt.tm_hour) * 60 + lt->tm_min - gmt.tm_min;

	if (lt->tm_year < gmt.tm_year)
		off -= 24 * 60;
	else if (lt->tm_year > gmt.tm_year)
		off += 24 * 60;
	else if (lt->tm_yday < gmt.tm_yday)
		off -= 24 * 60;
	else if (lt->tm_yday > gmt.tm_yday)
		off += 24 * 60;

	if (off < 0) {
		sign = '-';
		off = -off;
	}

	if (off >= 24 * 60)		/* should be impossible */
		off = 23 * 60 + 59;	/* if not, insert silly value */

	sprintf(offset_string, "%c%02d%02d", sign, off / 60, off % 60);

	return offset_string;
}

void get_rfc822_date(gchar *buf, gint len)
{
	struct tm *lt;
	time_t t;
	gchar day[4], mon[4];
	gint dd, hh, mm, ss, yyyy;

	t = time(NULL);
	lt = localtime(&t);

	sscanf(asctime(lt), "%3s %3s %d %d:%d:%d %d\n",
	       day, mon, &dd, &hh, &mm, &ss, &yyyy);
	g_snprintf(buf, len, "%s, %d %s %d %02d:%02d:%02d %s",
		   day, dd, mon, yyyy, hh, mm, ss, tzoffset(&t));
}

static FILE *log_fp = NULL;

void set_log_file(const gchar *filename)
{
	if (log_fp) return;
	log_fp = fopen(filename, "w");
	if (!log_fp)
		FILE_OP_ERROR(filename, "fopen");
}

void close_log_file(void)
{
	if (log_fp) {
		fclose(log_fp);
		log_fp = NULL;
	}
}

static guint log_verbosity_count = 0;

void log_verbosity_set(gboolean verbose)
{
	if (verbose)
		log_verbosity_count++;
	else if (log_verbosity_count > 0)
		log_verbosity_count--;
}

void debug_print_real(const gchar *format, ...)
{
	va_list args;
	gchar buf[BUFFSIZE];

	if (!debug_mode) return;

	va_start(args, format);
	g_vsnprintf(buf, sizeof(buf), format, args);
	va_end(args);

	fputs(buf, stdout);
}

void log_print(const gchar *format, ...)
{
	va_list args;
	gchar buf[BUFFSIZE];
	gchar *logbuf;
	gchar timestr[6];
	time_t t;

	va_start(args, format);
	g_vsnprintf(buf, sizeof(buf), format, args);
	va_end(args);
	
	time(&t);
	strftime(timestr, 6, "%H:%M", localtime(&t));
	logbuf = g_strdup_printf("[%s] %s", timestr, buf);

	if (debug_mode) fputs(logbuf, stdout);
	log_window_append(logbuf, LOG_NORMAL);
	if (log_fp) {
		fputs(logbuf, log_fp);
		fflush(log_fp);
	}
	if (log_verbosity_count)
		statusbar_puts_all(buf);
	g_free(logbuf);
}

void log_message(const gchar *format, ...)
{
	va_list args;
	gchar buf[BUFFSIZE];

	va_start(args, format);
	g_vsnprintf(buf, sizeof(buf), format, args);
	va_end(args);

	if (debug_mode) g_message("%s", buf);
	log_window_append(buf, LOG_MSG);
	if (log_fp) {
		fputs("message: ", log_fp);
		fputs(buf, log_fp);
		fflush(log_fp);
	}
	statusbar_puts_all(buf);
}

void log_warning(const gchar *format, ...)
{
	va_list args;
	gchar buf[BUFFSIZE];

	va_start(args, format);
	g_vsnprintf(buf, sizeof(buf), format, args);
	va_end(args);

	g_warning("%s", buf);
	log_window_append(buf, LOG_WARN);
	if (log_fp) {
		fputs("*** warning: ", log_fp);
		fputs(buf, log_fp);
		fflush(log_fp);
	}
}

void log_error(const gchar *format, ...)
{
	va_list args;
	gchar buf[BUFFSIZE];

	va_start(args, format);
	g_vsnprintf(buf, sizeof(buf), format, args);
	va_end(args);

	g_warning("%s", buf);
	log_window_append(buf, LOG_ERROR);
	if (log_fp) {
		fputs("*** error: ", log_fp);
		fputs(buf, log_fp);
		fflush(log_fp);
	}
}