path: root/etc.c

/* $Id: etc.c,v 1.22 2002/06/07 15:46:44 ukai Exp $ */
#include "fm.h"
#include <pwd.h>
#include "myctype.h"
#include "html.h"
#include "local.h"
#include "hash.h"
#include "terms.h"

#ifdef HAVE_GETCWD		/* ??? ukai */
#include <unistd.h>
#include <sys/param.h>
#endif				/* HAVE_GETCWD */

#include <sys/types.h>
#include <time.h>
#if defined(HAVE_WAITPID) || defined(HAVE_WAIT3)
#include <sys/wait.h>
#endif
#include <signal.h>

#ifdef	__WATT32__
#define	read(a,b,c)	read_s(a,b,c)
#define	close(x)	close_s(x)
#endif				/* __WATT32__ */


int
columnSkip(Buffer *buf, int offset)
{
    int i, maxColumn;
    int column = buf->currentColumn + offset;
    int nlines = LASTLINE + 1;
    Line *l;

    maxColumn = 0;
    for (i = 0, l = buf->topLine; i < nlines && l != NULL; i++, l = l->next) {
	if (l->width < 0)
	    l->width = COLPOS(l, l->len);
	if (l->width - 1 > maxColumn)
	    maxColumn = l->width - 1;
    }
    maxColumn -= buf->COLS - 1;
    if (column < maxColumn)
	maxColumn = column;
    if (maxColumn < 0)
	maxColumn = 0;

    if (buf->currentColumn == maxColumn)
	return 0;
    buf->currentColumn = maxColumn;
    return 1;
}

int
columnPos(Line *line, int column)
{
    int i;

    for (i = 1; i < line->len; i++) {
	if (COLPOS(line, i) > column) {
#ifdef JP_CHARSET
	    if (CharType(line->propBuf[i - 1]) == PC_KANJI2)
		return i - 2;
#endif
	    return i - 1;
	}
    }
    return i - 1;
}

Line *
lineSkip(Buffer *buf, Line *line, int offset, int last)
{
    int i;
    Line *l;

    l = currentLineSkip(buf, line, offset, last);
#ifdef NEXTPAGE_TOPLINE
    if (!nextpage_topline)
#endif
	for (i = (LASTLINE - 1) - (buf->lastLine->linenumber - l->linenumber);
	     i > 0 && l->prev != NULL; i--, l = l->prev) ;
    return l;
}

Line *
currentLineSkip(Buffer *buf, Line *line, int offset, int last)
{
    int i, n;
    Line *l = line;

    if (buf->pagerSource && !(buf->bufferprop & BP_CLOSE)) {
	n = line->linenumber + offset + LASTLINE;
	if (buf->lastLine->linenumber < n)
	    getNextPage(buf, n - buf->lastLine->linenumber);
	while ((last || (buf->lastLine->linenumber < n)) &&
	       (getNextPage(buf, 1) != NULL)) ;
	if (last)
	    l = buf->lastLine;
    }

    if (offset == 0)
	return l;
    if (offset > 0)
	for (i = 0; i < offset && l->next != NULL; i++, l = l->next) ;
    else
	for (i = 0; i < -offset && l->prev != NULL; i++, l = l->prev) ;
    return l;
}

#define MAX_CMD_LEN 128

int
gethtmlcmd(char **s)
{
    extern Hash_si tagtable;
    char cmdstr[MAX_CMD_LEN];
    char *p = cmdstr;
    char *save = *s;
    int cmd;

    (*s)++;
    /* first character */
    if (IS_ALNUM(**s) || **s == '_' || **s == '/')
	*(p++) = tolower(*((*s)++));
    else
	return HTML_UNKNOWN;
    if (p[-1] == '/')
	SKIP_BLANKS(*s);
    while ((IS_ALNUM(**s) || **s == '_') && p - cmdstr < MAX_CMD_LEN) {
	*(p++) = tolower(*((*s)++));
    }
    if (p - cmdstr == MAX_CMD_LEN) {
	/* buffer overflow: perhaps caused by bad HTML source */
	*s = save + 1;
	return HTML_UNKNOWN;
    }
    *p = '\0';

    /* hash search */
    cmd = getHash_si(&tagtable, cmdstr, HTML_UNKNOWN);
    while (**s && **s != '>')
	(*s)++;
    if (**s == '>')
	(*s)++;
    return cmd;
}

#ifdef USE_ANSI_COLOR
static int
parse_ansi_color(char **str, Lineprop *effect, Linecolor *color)
{
    char *p = *str, *q;
    Lineprop e = *effect;
    Linecolor c = *color;
    int i;

    if (*p != ESC_CODE || *(p + 1) != '[')
	return 0;
    p += 2;
    for (q = p; IS_DIGIT(*q) || *q == ';'; q++) ;
    if (*q != 'm')
	return 0;
    *str = q + 1;
    while (1) {
	if (*p == 'm') {
	    e = PE_NORMAL;
	    c = 0;
	    break;
	}
	if (IS_DIGIT(*p)) {
	    q = p;
	    for (p++; IS_DIGIT(*p); p++) ;
	    i = atoi(allocStr(q, p - q));
	    switch (i) {
	    case 0:
		e = PE_NORMAL;
		c = 0;
		break;
	    case 1:
	    case 5:
		e = PE_BOLD;
		break;
	    case 4:
		e = PE_UNDER;
		break;
	    case 7:
		e = PE_STAND;
		break;
	    case 100:		/* for EWS4800 kterm */
		c = 0;
		break;
	    case 39:
		c &= 0xf0;
		break;
	    case 49:
		c &= 0x0f;
		break;
	    default:
		if (i >= 30 && i <= 37)
		    c = (c & 0xf0) | (i - 30) | 0x08;
		else if (i >= 40 && i <= 47)
		    c = (c & 0x0f) | ((i - 40) << 4) | 0x80;
		break;
	    }
	    if (*p == 'm')
		break;
	}
	else {
	    e = PE_NORMAL;
	    c = 0;
	    break;
	}
	p++;			/* *p == ';' */
    }
    *effect = e;
    *color = c;
    return 1;
}
#endif

/* 
 * Check character type
 */

Str
checkType(Str s, Lineprop *oprop,
#ifdef USE_ANSI_COLOR
	  Linecolor *ocolor, int *check_color,
#endif
	  int len)
{
    Lineprop mode;
    Lineprop effect = PE_NORMAL;
    Lineprop *prop = oprop;
    char *str = s->ptr, *endp = &s->ptr[s->length], *bs = NULL;
#ifdef USE_ANSI_COLOR
    Lineprop ceffect = PE_NORMAL;
    Linecolor cmode = 0;
    Linecolor *color = NULL;
    char *es = NULL;
#endif
    int do_copy = FALSE;
    int size = (len < s->length) ? len : s->length;

#ifdef USE_ANSI_COLOR
    if (check_color)
	*check_color = FALSE;
#endif
    if (ShowEffect) {
	bs = memchr(str, '\b', s->length);
#ifdef USE_ANSI_COLOR
	if (ocolor) {
	    es = memchr(str, ESC_CODE, s->length);
	    if (es)
		color = ocolor;
	}
#endif
	if (s->length > size || (bs != NULL)
#ifdef USE_ANSI_COLOR
	    || (es != NULL)
#endif
	    ) {
	    s = Strnew_size(size);
	    do_copy = TRUE;
	}
    }

    while (str < endp) {
	if (prop - oprop >= len)
	    break;
	if (bs != NULL) {
	    if (str == bs - 2 && !strncmp(str, "__\b\b", 4)) {
		str += 4;
		effect = PE_UNDER;
		if (str < endp)
		    bs = memchr(str, '\b', endp - str);
		continue;
	    }
	    else if (str == bs - 1 && *str == '_') {
		str += 2;
		effect = PE_UNDER;
		if (str < endp)
		    bs = memchr(str, '\b', endp - str);
		continue;
	    }
	    else if (str == bs) {
		if (*(str + 1) == '_') {
#ifdef JP_CHARSET
		    if (s->length > 1 && CharType(*(prop - 2)) == PC_KANJI1) {
			str += 2;
			*(prop - 1) |= PE_UNDER;
			*(prop - 2) |= PE_UNDER;
		    }
		    else
#endif				/* JP_CHARSET */
		    if (s->length > 0) {
			str += 2;
			*(prop - 1) |= PE_UNDER;
		    }
		    else {
			str++;
		    }
		}
		else if (!strncmp(str + 1, "\b__", 3)) {
#ifdef JP_CHARSET
		    if (s->length > 1 && CharType(*(prop - 2)) == PC_KANJI1) {
			str += 4;
			*(prop - 1) |= PE_UNDER;
			*(prop - 2) |= PE_UNDER;
		    }
		    else
#endif				/* JP_CHARSET */
		    if (s->length > 0) {
			str += 3;
			*(prop - 1) |= PE_UNDER;
		    }
		    else {
			str += 2;
		    }
		}
		else if (*(str + 1) == '\b') {
#ifdef JP_CHARSET
		    if (s->length > 1 && CharType(*(prop - 2)) == PC_KANJI1) {
			if (str + 4 <= endp && !strncmp(str - 2, str + 2, 2)) {
			    *(prop - 1) |= PE_BOLD;
			    *(prop - 2) |= PE_BOLD;
			    str += 4;
			}
			else {
			    Strshrink(s, 2);
			    prop -= 2;
			    str += 2;
			}
		    }
		    else
#endif				/* JP_CHARSET */
		    if (s->length > 0) {
			if (str + 3 <= endp && *(str - 1) == *(str + 2)) {
			    *(prop - 1) |= PE_BOLD;
			    str += 3;
			}
			else {
			    Strshrink(s, 1);
			    prop--;
			    str += 2;
			}
		    }
		    else {
			str += 2;
		    }
		}
		else {
#ifdef JP_CHARSET
		    if (s->length > 1 && CharType(*(prop - 2)) == PC_KANJI1) {
			if (str + 3 <= endp && !strncmp(str - 2, str + 1, 2)) {
			    *(prop - 1) |= PE_BOLD;
			    *(prop - 2) |= PE_BOLD;
			    str += 3;
			}
			else {
			    Strshrink(s, 2);
			    prop -= 2;
			    str++;
			}
		    }
		    else
#endif				/* JP_CHARSET */
		    if (s->length > 0) {
			if (str + 2 <= endp && *(str - 1) == *(str + 1)) {
			    *(prop - 1) |= PE_BOLD;
			    str += 2;
			}
			else {
			    Strshrink(s, 1);
			    prop--;
			    str++;
			}
		    }
		    else {
			str++;
		    }
		}
		if (str < endp)
		    bs = memchr(str, '\b', endp - str);
		continue;
	    }
#ifdef USE_ANSI_COLOR
	    else if (str > bs)
		bs = memchr(str, '\b', endp - str);
#endif
	}
#ifdef USE_ANSI_COLOR
	if (es != NULL) {
	    if (str == es) {
		int ok = parse_ansi_color(&str, &ceffect, &cmode);
		if (str < endp)
		    es = memchr(str, ESC_CODE, endp - str);
		if (ok) {
		    if (cmode)
			*check_color = TRUE;
		    continue;
		}
	    }
	    else if (str > es)
		es = memchr(str, ESC_CODE, endp - str);
	}
#endif

	mode = get_mctype(str);
#ifdef USE_ANSI_COLOR
	effect |= ceffect;
#endif
#ifdef JP_CHARSET
	if (mode == PC_KANJI) {
	    prop[0] = (effect | PC_KANJI1);
	    prop[1] = (effect | PC_KANJI2);
	    if (do_copy) {
		Strcat_char(s, str[0]);
		Strcat_char(s, str[1]);
	    }
	    prop += 2;
	    str += 2;
#ifdef USE_ANSI_COLOR
	    if (color) {
		color[0] = cmode;
		color[1] = cmode;
		color += 2;
	    }
#endif
	}
	else
#endif				/* JP_CHARSET */
	{
	    *prop = (effect | mode);
	    if (do_copy)
		Strcat_char(s, *str);
	    prop++;
	    str++;
#ifdef USE_ANSI_COLOR
	    if (color) {
		*color = cmode;
		color++;
	    }
#endif
	}
	effect = PE_NORMAL;
    }
    return s;
}

int
calcPosition(char *l, Lineprop *pr, int len, int pos, int bpos, int mode)
{
    static short realColumn[LINELEN + 1];
    static char *prevl = NULL;
    int i, j;

    if (l == NULL || len == 0)
	return bpos;
    if (l == prevl && mode == CP_AUTO) {
	if (pos <= len)
	    return realColumn[pos];
    }
    prevl = l;
    j = bpos;
    for (i = 0;; i++) {
	realColumn[i] = j;
	if (i == len)
	    break;
	if (l[i] == '\t' && pr[i] == PC_CTRL)
	    j = (j + Tabstop) / Tabstop * Tabstop;
#ifndef KANJI_SYMBOLS
	else if (pr[i] & PC_RULE)
	    j++;
#endif
	else if (IS_UNPRINTABLE_ASCII(l[i], pr[i]))
	    j = j + 4;
	else if (IS_UNPRINTABLE_CONTROL(l[i], pr[i]))
	    j = j + 2;
	else
	    j++;
    }
    if (pos >= i)
	return j;
    return realColumn[pos];
}

char *
lastFileName(char *path)
{
    char *p, *q;

    p = q = path;
    while (*p != '\0') {
	if (*p == '/')
	    q = p + 1;
	p++;
    }

    return allocStr(q, -1);
}

#ifdef USE_INCLUDED_SRAND48
static unsigned long R1 = 0x1234abcd;
static unsigned long R2 = 0x330e;
#define A1 0x5deec
#define A2 0xe66d
#define C 0xb

void
srand48(long seed)
{
    R1 = (unsigned long)seed;
    R2 = 0x330e;
}

long
lrand48(void)
{
    R1 = (A1 * R1 << 16) + A1 * R2 + A2 * R1 + ((A2 * R2 + C) >> 16);
    R2 = (A2 * R2 + C) & 0xffff;
    return (long)(R1 >> 1);
}
#endif

char *
mybasename(char *s)
{
    char *p = s;
    while (*p)
	p++;
    while (s <= p && *p != '/')
	p--;
    if (*p == '/')
	p++;
    else
	p = s;
    return allocStr(p, -1);
}

char *
mydirname(char *s)
{
    char *p = s;
    while (*p)
	p++;
    if (s != p)
	p--;
    while (s != p && *p == '/')
	p--;
    while (s != p && *p != '/')
	p--;
    if (*p != '/')
	return ".";
    while (s != p && *p == '/')
	p--;
    return allocStr(s, strlen(s) - strlen(p) + 1);
}

#ifndef HAVE_STRERROR
char *
strerror(int errno)
{
    extern char *sys_errlist[];
    return sys_errlist[errno];
}
#endif				/* not HAVE_STRERROR */

#ifndef HAVE_SYS_ERRLIST
char **sys_errlist;

prepare_sys_errlist()
{
    int i, n;

    i = 1;
    while (strerror(i) != NULL)
	i++;
    n = i;
    sys_errlist = New_N(char *, n);
    sys_errlist[0] = "";
    for (i = 1; i < n; i++)
	sys_errlist[i] = strerror(i);
}
#endif				/* not HAVE_SYS_ERRLIST */

int
next_status(char c, int *status)
{
    switch (*status) {
    case R_ST_NORMAL:
	if (c == '<') {
	    *status = R_ST_TAG0;
	    return 0;
	}
	else if (c == '&') {
	    *status = R_ST_AMP;
	    return 1;
	}
	else
	    return 1;
	break;
    case R_ST_TAG0:
	if (c == '!') {
	    *status = R_ST_CMNT1;
	    return 0;
	}
	*status = R_ST_TAG;
	/* continues to next case */
    case R_ST_TAG:
	if (c == '>')
	    *status = R_ST_NORMAL;
	else if (c == '=')
	    *status = R_ST_EQL;
	return 0;
    case R_ST_EQL:
	if (c == '"')
	    *status = R_ST_DQUOTE;
	else if (c == '\'')
	    *status = R_ST_QUOTE;
	else if (IS_SPACE(c))
	    *status = R_ST_EQL;
	else if (c == '>')
	    *status = R_ST_NORMAL;
	else
	    *status = R_ST_TAG;
	return 0;
    case R_ST_QUOTE:
	if (c == '\'')
	    *status = R_ST_TAG;
	return 0;
    case R_ST_DQUOTE:
	if (c == '"')
	    *status = R_ST_TAG;
	return 0;
    case R_ST_AMP:
	if (c == ';') {
	    *status = R_ST_NORMAL;
	    return 0;
	}
	else if (c != '#' && !IS_ALNUM(c) && c != '_') {
	    /* something's wrong! */
	    *status = R_ST_NORMAL;
	    return 0;
	}
	else
	    return 0;
    case R_ST_CMNT1:
	switch (c) {
	case '-':
	    *status = R_ST_CMNT2;
	    break;
	case '>':
	    *status = R_ST_NORMAL;
	    break;
	default:
	    *status = R_ST_IRRTAG;
	}
	return 0;
    case R_ST_CMNT2:
	switch (c) {
	case '-':
	    *status = R_ST_CMNT;
	    break;
	case '>':
	    *status = R_ST_NORMAL;
	    break;
	default:
	    *status = R_ST_IRRTAG;
	}
	return 0;
    case R_ST_CMNT:
	if (c == '-')
	    *status = R_ST_NCMNT1;
	return 0;
    case R_ST_NCMNT1:
	if (c == '-')
	    *status = R_ST_NCMNT2;
	else
	    *status = R_ST_CMNT;
	return 0;
    case R_ST_NCMNT2:
	switch (c) {
	case '>':
	    *status = R_ST_NORMAL;
	    break;
	case '-':
	    *status = R_ST_NCMNT2;
	    break;
	default:
	    if (IS_SPACE(c))
		*status = R_ST_NCMNT3;
	    else
		*status = R_ST_CMNT;
	    break;
	}
	break;
    case R_ST_NCMNT3:
	switch (c) {
	case '>':
	    *status = R_ST_NORMAL;
	    break;
	case '-':
	    *status = R_ST_NCMNT1;
	    break;
	default:
	    if (IS_SPACE(c))
		*status = R_ST_NCMNT3;
	    else
		*status = R_ST_CMNT;
	    break;
	}
	return 0;
    case R_ST_IRRTAG:
	if (c == '>')
	    *status = R_ST_NORMAL;
	return 0;
    }
    /* notreached */
    return 0;
}

int
read_token(Str buf, char **instr, int *status, int pre, int append)
{
    char *p;
    int prev_status;

    if (!append)
	Strclear(buf);
    if (**instr == '\0')
	return 0;
    for (p = *instr; *p; p++) {
	prev_status = *status;
	next_status(*p, status);
	switch (*status) {
	case R_ST_NORMAL:
	    if (prev_status == R_ST_AMP && *p != ';') {
		p--;
		break;
	    }
	    if (prev_status == R_ST_NCMNT2 || prev_status == R_ST_NCMNT3 ||
		prev_status == R_ST_IRRTAG || prev_status == R_ST_CMNT1) {
		if (prev_status == R_ST_CMNT1 && !append)
		    Strclear(buf);
		p++;
		goto proc_end;
	    }
	    Strcat_char(buf, (!pre && IS_SPACE(*p)) ? ' ' : *p);
	    if (ST_IS_REAL_TAG(prev_status)) {
		*instr = p + 1;
		if (buf->length < 2 ||
		    buf->ptr[buf->length - 2] != '<' ||
		    buf->ptr[buf->length - 1] != '>')
		    return 1;
		Strshrink(buf, 2);
	    }
	    break;
	case R_ST_TAG0:
	case R_ST_TAG:
	    if (prev_status == R_ST_NORMAL && p != *instr) {
		*instr = p;
		*status = prev_status;
		return 1;
	    }
	    if (*status == R_ST_TAG0 && !REALLY_THE_BEGINNING_OF_A_TAG(p)) {
		/* it seems that this '<' is not a beginning of a tag */
		Strcat_charp(buf, "&lt;");
		*status = R_ST_NORMAL;
	    }
	    else
		Strcat_char(buf, *p);
	    break;
	case R_ST_EQL:
	case R_ST_QUOTE:
	case R_ST_DQUOTE:
	case R_ST_AMP:
	    Strcat_char(buf, *p);
	    break;
	case R_ST_CMNT:
	case R_ST_IRRTAG:
	    if (!append)
		Strclear(buf);
	    break;
	case R_ST_CMNT1:
	case R_ST_CMNT2:
	case R_ST_NCMNT1:
	case R_ST_NCMNT2:
	case R_ST_NCMNT3:
	    /* do nothing */
	    break;
	}
    }
  proc_end:
    *instr = p;
    return 1;
}

Str
correct_irrtag(int status)
{
    char c;
    Str tmp = Strnew();

    while (status != R_ST_NORMAL) {
	switch (status) {
	case R_ST_CMNT:	/* required "-->" */
	case R_ST_NCMNT1:	/* required "->" */
	    c = '-';
	    break;
	case R_ST_NCMNT2:
	case R_ST_NCMNT3:
	case R_ST_IRRTAG:
	case R_ST_CMNT1:
	case R_ST_CMNT2:
	case R_ST_TAG:
	case R_ST_TAG0:
	case R_ST_EQL:		/* required ">" */
	    c = '>';
	    break;
	case R_ST_QUOTE:
	    c = '\'';
	    break;
	case R_ST_DQUOTE:
	    c = '"';
	    break;
	case R_ST_AMP:
	    c = ';';
	    break;
	default:
	    return tmp;
	}
	next_status(c, &status);
	Strcat_char(tmp, c);
    }
    return tmp;
}

/* authentication */
struct auth_cookie *
find_auth(char *host, int port, char *file, char *realm)
{
    struct auth_cookie *p;

    for (p = Auth_cookie; p != NULL; p = p->next) {
	if (!Strcasecmp_charp(p->host, host) &&
	    p->port == port &&
	    ((realm && !Strcasecmp_charp(p->realm, realm)) ||
	     (p->file && file && !Strcasecmp_charp(p->file, file))))
	    return p;
    }
    return NULL;
}

Str
find_auth_cookie(char *host, int port, char *file, char *realm)
{
    struct auth_cookie *p = find_auth(host, port, file, realm);
    if (p)
	return p->cookie;
    return NULL;
}

void
add_auth_cookie(char *host, int port, char *file, char *realm, Str cookie)
{
    struct auth_cookie *p;

    p = find_auth(host, port, file, realm);
    if (p) {
	if (realm && p->realm == NULL)
	    p->realm = Strnew_charp(realm);
	p->cookie = cookie;
	return;
    }
    p = New(struct auth_cookie);
    p->host = Strnew_charp(host);
    p->port = port;
    p->file = file ? Strnew_charp(file) : NULL;
    p->realm = Strnew_charp(realm);
    p->cookie = cookie;
    p->next = Auth_cookie;
    Auth_cookie = p;
}

/* get last modified time */
char *
last_modified(Buffer *buf)
{
    TextListItem *ti;
    struct stat st;

    if (buf->document_header) {
	for (ti = buf->document_header->first; ti; ti = ti->next) {
	    if (strncasecmp(ti->ptr, "Last-modified: ", 15) == 0) {
		return ti->ptr + 15;
	    }
	}
	return "unknown";
    }
    else if (buf->currentURL.scheme == SCM_LOCAL) {
	if (stat(buf->currentURL.file, &st) < 0)
	    return "unknown";
	return ctime(&st.st_mtime);
    }
    return "unknown";
}

static char roman_num1[] = {
    'i', 'x', 'c', 'm', '*',
};
static char roman_num5[] = {
    'v', 'l', 'd', '*',
};

static Str
romanNum2(int l, int n)
{
    Str s = Strnew();

    switch (n) {
    case 1:
    case 2:
    case 3:
	for (; n > 0; n--)
	    Strcat_char(s, roman_num1[l]);
	break;
    case 4:
	Strcat_char(s, roman_num1[l]);
	Strcat_char(s, roman_num5[l]);
	break;
    case 5:
    case 6:
    case 7:
    case 8:
	Strcat_char(s, roman_num5[l]);
	for (n -= 5; n > 0; n--)
	    Strcat_char(s, roman_num1[l]);
	break;
    case 9:
	Strcat_char(s, roman_num1[l]);
	Strcat_char(s, roman_num1[l + 1]);
	break;
    }
    return s;
}

Str
romanNumeral(int n)
{
    Str r = Strnew();

    if (n <= 0)
	return r;
    if (n >= 4000) {
	Strcat_charp(r, "**");
	return r;
    }
    Strcat(r, romanNum2(3, n / 1000));
    Strcat(r, romanNum2(2, (n % 1000) / 100));
    Strcat(r, romanNum2(1, (n % 100) / 10));
    Strcat(r, romanNum2(0, n % 10));

    return r;
}

Str
romanAlphabet(int n)
{
    Str r = Strnew();
    int l;
    char buf[14];

    if (n <= 0)
	return r;

    l = 0;
    while (n) {
	buf[l++] = 'a' + (n - 1) % 26;
	n = (n - 1) / 26;
    }
    l--;
    for (; l >= 0; l--)
	Strcat_char(r, buf[l]);

    return r;
}

#ifndef SIGIOT
#define SIGIOT SIGABRT
#endif				/* not SIGIOT */

void
reset_signals(void)
{
    signal(SIGHUP, SIG_DFL);	/* terminate process */
    signal(SIGINT, SIG_DFL);	/* terminate process */
    signal(SIGQUIT, SIG_DFL);	/* terminate process */
    signal(SIGTERM, SIG_DFL);	/* terminate process */
    signal(SIGILL, SIG_DFL);	/* create core image */
    signal(SIGIOT, SIG_DFL);	/* create core image */
    signal(SIGFPE, SIG_DFL);	/* create core image */
#ifdef SIGBUS
    signal(SIGBUS, SIG_DFL);	/* create core image */
#endif				/* SIGBUS */
#ifdef SIGCHLD
    signal(SIGCHLD, SIG_IGN);
#endif
#ifdef SIGPIPE
    signal(SIGPIPE, SIG_IGN);
#endif
    signal(SIGUSR1, SIG_IGN);
}

void
mySystem(char *command, int background)
{
    if (background) {
#ifndef HAVE_SETPGRP
	Str cmd = Strnew_charp("start /f ");
	Strcat_charp(cmd, command);
	system(cmd->ptr);
#else
	int pid;
	flush_tty();
	if ((pid = fork()) == 0) {
	    reset_signals();
	    SETPGRP();
	    close_tty();
	    fclose(stdout);
	    fclose(stderr);
	    execl("/bin/sh", "sh", "-c", command, NULL);
	    exit(127);
	}
#endif
    }
    else
	system(command);
}

Str
myExtCommand(char *cmd, char *arg, int redirect)
{
    Str tmp = NULL;
    char *p;
    int set_arg = FALSE;

    for (p = cmd; *p; p++) {
	if (*p == '%' && *(p + 1) == 's' && !set_arg) {
	    if (tmp == NULL)
		tmp = Strnew_charp_n(cmd, (int)(p - cmd));
	    Strcat_charp(tmp, arg);
	    set_arg = TRUE;
	    p++;
	}
	else {
	    if (tmp)
		Strcat_char(tmp, *p);
	}
    }
    if (!set_arg)
	tmp = Strnew_m_charp(cmd, (redirect ? " < " : " "), arg, NULL);
    return tmp;
}

Str
myEditor(char *cmd, char *file, int line)
{
    Str tmp = NULL;
    char *p;
    int set_file = FALSE, set_line = FALSE;

    for (p = cmd; *p; p++) {
	if (*p == '%' && *(p + 1) == 's' && !set_file) {
	    if (tmp == NULL)
		tmp = Strnew_charp_n(cmd, (int)(p - cmd));
	    Strcat_charp(tmp, file);
	    set_file = TRUE;
	    p++;
	}
	else if (*p == '%' && *(p + 1) == 'd' && !set_line && line > 0) {
	    if (tmp == NULL)
		tmp = Strnew_charp_n(cmd, (int)(p - cmd));
	    Strcat(tmp, Sprintf("%d", line));
	    set_line = TRUE;
	    p++;
	}
	else {
	    if (tmp)
		Strcat_char(tmp, *p);
	}
    }
    if (!set_file) {
	if (tmp == NULL)
	    tmp = Strnew_charp(cmd);
	if (!set_line && line > 1 && strcasestr(cmd, "vi"))
	    Strcat(tmp, Sprintf(" +%d", line));
	Strcat_m_charp(tmp, " ", file, NULL);
    }
    return tmp;
}

char *
expandName(char *name)
{
    Str userName = NULL;
    char *p;
    struct passwd *passent, *getpwnam(const char *);
    Str extpath = Strnew();

    p = name;
    if (*p == '/' && *(p + 1) == '~' && IS_ALPHA(*(p + 2))) {
	if (personal_document_root != NULL) {
	    userName = Strnew();
	    p += 2;
	    while (IS_ALNUM(*p) || *p == '_' || *p == '-')
		Strcat_char(userName, *(p++));
	    passent = getpwnam(userName->ptr);
	    if (passent == NULL) {
		p = name;
		goto rest;
	    }
	    Strcat_charp(extpath, passent->pw_dir);
	    Strcat_char(extpath, '/');
	    Strcat_charp(extpath, personal_document_root);
	    if (Strcmp_charp(extpath, "/") == 0 && *p == '/')
		p++;
	}
    }
    else
	p = expandPath(p);
  rest:
    Strcat_charp(extpath, p);
    return extpath->ptr;
}

char *
file_to_url(char *file)
{
    Str tmp;
#ifdef SUPPORT_DOS_DRIVE_PREFIX
    char *drive = NULL;
#endif
#ifdef SUPPORT_NETBIOS_SHARE
    char *host = NULL;
#endif

    file = expandName(file);
#ifdef SUPPORT_NETBIOS_SHARE
    if (file[0] == '/' && file[1] == '/') {
	char *p;
	file += 2;
	if (*file) {
	    p = strchr(file, '/');
	    if (p != NULL && p != file) {
		host = allocStr(file, (p - file));
		file = p;
	    }
	}
    }
#endif
#ifdef SUPPORT_DOS_DRIVE_PREFIX
    if (IS_ALPHA(file[0]) && file[1] == ':') {
	drive = allocStr(file, 2);
	file += 2;
    }
    else
#endif
    if (file[0] != '/') {
	tmp = Strnew_charp(CurrentDir);
	if (Strlastchar(tmp) != '/')
	    Strcat_char(tmp, '/');
	Strcat_charp(tmp, file);
	file = tmp->ptr;
    }
    tmp = Strnew_charp("file://");
#ifdef SUPPORT_NETBIOS_SHARE
    if (host)
	Strcat_charp(tmp, host);
#endif
#ifdef SUPPORT_DOS_DRIVE_PREFIX
    if (drive)
	Strcat_charp(tmp, drive);
#endif
    Strcat_charp(tmp, file_quote(cleanupName(file)));
    return tmp->ptr;
}

static char *tmpf_base[MAX_TMPF_TYPE] = {
    "tmp", "src", "frame", "cache"
};
static unsigned int tmpf_seq[MAX_TMPF_TYPE];

Str
tmpfname(int type, char *ext)
{
    Str tmpf;
    tmpf = Sprintf("%s/w3m%s%d-%d%s",
		   rc_dir,
		   tmpf_base[type],
		   (int)getpid(), tmpf_seq[type]++, (ext) ? ext : "");
    return tmpf;
}

#ifdef USE_COOKIE
static char *monthtbl[] = {
    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};

static int
get_day(char **s)
{
    Str tmp = Strnew();
    int day;
    char *ss = *s;

    if (!**s)
	return -1;

    while (**s && IS_DIGIT(**s))
	Strcat_char(tmp, *((*s)++));

    day = atoi(tmp->ptr);

    if (day < 1 || day > 31) {
	*s = ss;
	return -1;
    }
    return day;
}

static int
get_month(char **s)
{
    Str tmp = Strnew();
    int mon;
    char *ss = *s;

    if (!**s)
	return -1;

    while (**s && IS_DIGIT(**s))
	Strcat_char(tmp, *((*s)++));
    if (tmp->length > 0) {
	mon = atoi(tmp->ptr);
    }
    else {
	while (**s && IS_ALPHA(**s))
	    Strcat_char(tmp, *((*s)++));
	for (mon = 1; mon <= 12; mon++) {
	    if (strncmp(tmp->ptr, monthtbl[mon - 1], 3) == 0)
		break;
	}
    }
    if (mon < 1 || mon > 12) {
	*s = ss;
	return -1;
    }
    return mon;
}

static int
get_year(char **s)
{
    Str tmp = Strnew();
    int year;
    char *ss = *s;

    if (!**s)
	return -1;

    while (**s && IS_DIGIT(**s))
	Strcat_char(tmp, *((*s)++));
    if (tmp->length != 2 && tmp->length != 4) {
	*s = ss;
	return -1;
    }

    year = atoi(tmp->ptr);
    if (tmp->length == 2) {
	if (year >= 70)
	    year += 1900;
	else
	    year += 2000;
    }
    return year;
}

static int
get_time(char **s, int *hour, int *min, int *sec)
{
    Str tmp = Strnew();
    char *ss = *s;

    if (!**s)
	return -1;

    while (**s && IS_DIGIT(**s))
	Strcat_char(tmp, *((*s)++));
    if (**s != ':') {
	*s = ss;
	return -1;
    }
    *hour = atoi(tmp->ptr);

    (*s)++;
    Strclear(tmp);
    while (**s && IS_DIGIT(**s))
	Strcat_char(tmp, *((*s)++));
    if (**s != ':') {
	*s = ss;
	return -1;
    }
    *min = atoi(tmp->ptr);

    (*s)++;
    Strclear(tmp);
    while (**s && IS_DIGIT(**s))
	Strcat_char(tmp, *((*s)++));
    *sec = atoi(tmp->ptr);

    if (*hour < 0 || *hour >= 24 ||
	*min < 0 || *min >= 60 || *sec < 0 || *sec >= 60) {
	*s = ss;
	return -1;
    }
    return 0;
}

/* RFC 1123 or RFC 850 or ANSI C asctime() format string -> time_t */
time_t
mymktime(char *timestr)
{
    char *s;
    int day, mon, year, hour, min, sec;

    if (!(timestr && *timestr))
	return -1;
    s = timestr;

#ifdef DEBUG
    fprintf(stderr, "mktime: %s\n", timestr);
#endif				/* DEBUG */

    while (*s && IS_ALPHA(*s))
	s++;
    while (*s && !IS_ALNUM(*s))
	s++;

    if (IS_DIGIT(*s)) {
	/* RFC 1123 or RFC 850 format */
	if ((day = get_day(&s)) == -1)
	    return -1;

	while (*s && !IS_ALNUM(*s))
	    s++;
	if ((mon = get_month(&s)) == -1)
	    return -1;

	while (*s && !IS_DIGIT(*s))
	    s++;
	if ((year = get_year(&s)) == -1)
	    return -1;

	while (*s && !IS_DIGIT(*s))
	    s++;
	if (!*s) {
	    hour = 0;
	    min = 0;
	    sec = 0;
	}
	else if (get_time(&s, &hour, &min, &sec) == -1) {
	    return -1;
	}
    }
    else {
	/* ANSI C asctime() format. */
	while (*s && !IS_ALNUM(*s))
	    s++;
	if ((mon = get_month(&s)) == -1)
	    return -1;

	while (*s && !IS_DIGIT(*s))
	    s++;
	if ((day = get_day(&s)) == -1)
	    return -1;

	while (*s && !IS_DIGIT(*s))
	    s++;
	if (get_time(&s, &hour, &min, &sec) == -1)
	    return -1;

	while (*s && !IS_DIGIT(*s))
	    s++;
	if ((year = get_year(&s)) == -1)
	    return -1;
    }
#ifdef DEBUG
    fprintf(stderr, "year=%d month=%d day=%d hour:min:sec=%d:%d:%d\n",
	    year, mon, day, hour, min, sec);
#endif				/* DEBUG */

    mon -= 3;
    if (mon < 0) {
	mon += 12;
	year--;
    }
    day += (year - 1968) * 1461 / 4;
    day += ((((mon * 153) + 2) / 5) - 672);
    return (time_t) ((day * 60 * 60 * 24) +
		     (hour * 60 * 60) + (min * 60) + sec);
}

#ifdef INET6
#include <sys/socket.h>
#endif				/* INET6 */
#include <netdb.h>
char *
FQDN(char *host)
{
    char *p;
#ifndef INET6
    struct hostent *entry;
#else				/* INET6 */
    int *af;
#endif				/* INET6 */

    if (host == NULL)
	return NULL;

    if (strcasecmp(host, "localhost") == 0)
	return host;

    for (p = host; *p && *p != '.'; p++) ;

    if (*p == '.')
	return host;

#ifndef INET6
    if (!(entry = gethostbyname(host)))
	return NULL;

    return allocStr(entry->h_name, -1);
#else				/* INET6 */
    for (af = ai_family_order_table[DNS_order];; af++) {
	int error;
	struct addrinfo hints;
	struct addrinfo *res, *res0;
	char *namebuf;

	memset(&hints, 0, sizeof(hints));
	hints.ai_family = *af;
	hints.ai_socktype = SOCK_STREAM;
	error = getaddrinfo(host, NULL, &hints, &res0);
	if (error) {
	    if (*af == PF_UNSPEC) {
		/* all done */
		break;
	    }
	    /* try next address family */
	    continue;
	}
	for (res = res0; res != NULL; res = res->ai_next) {
	    if (res->ai_canonname) {
		/* found */
		namebuf = strdup(res->ai_canonname);
		freeaddrinfo(res0);
		return namebuf;
	    }
	}
	freeaddrinfo(res0);
	if (*af == PF_UNSPEC) {
	    break;
	}
    }
    /* all failed */
    return NULL;
#endif				/* INET6 */
}

#endif				/* USE_COOKIE */