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/*
* Copyright (c) 2003-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* 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.
*
* This program is distributed in the hope that it would 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, see <http://www.gnu.org/licenses/>.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/time.h>
#include <getopt.h>

#include "cmd.h"
#include "qemu-aio.h"

#define _(x) x /* not gettext support yet */

/* from libxcmd/command.c */

cmdinfo_t *cmdtab;
int ncmds;

static argsfunc_t args_func;
static checkfunc_t check_func;
static int ncmdline;
static char **cmdline;

static int
compare(const void *a, const void *b)
{
return strcmp(((const cmdinfo_t *)a)->name,
((const cmdinfo_t *)b)->name);
}

void
add_command(
const cmdinfo_t *ci)
{
cmdtab = realloc((void *)cmdtab, ++ncmds * sizeof(*cmdtab));
cmdtab[ncmds - 1] = *ci;
qsort(cmdtab, ncmds, sizeof(*cmdtab), compare);
}

static int
check_command(
const cmdinfo_t *ci)
{
if (check_func)
return check_func(ci);
return 1;
}

void
add_check_command(
checkfunc_t cf)
{
check_func = cf;
}

int
command_usage(
const cmdinfo_t *ci)
{
printf("%s %s -- %s\n", ci->name, ci->args, ci->oneline);
return 0;
}

int
command(
const cmdinfo_t *ct,
int argc,
char **argv)
{
char *cmd = argv[0];

if (!check_command(ct))
return 0;

if (argc-1 < ct->argmin || (ct->argmax != -1 && argc-1 > ct->argmax)) {
if (ct->argmax == -1)
fprintf(stderr,
_("bad argument count %d to %s, expected at least %d arguments\n"),
argc-1, cmd, ct->argmin);
else if (ct->argmin == ct->argmax)
fprintf(stderr,
_("bad argument count %d to %s, expected %d arguments\n"),
argc-1, cmd, ct->argmin);
else
fprintf(stderr,
_("bad argument count %d to %s, expected between %d and %d arguments\n"),
argc-1, cmd, ct->argmin, ct->argmax);
return 0;
}
optind = 0;
return ct->cfunc(argc, argv);
}

const cmdinfo_t *
find_command(
const char *cmd)
{
cmdinfo_t *ct;

for (ct = cmdtab; ct < &cmdtab[ncmds]; ct++) {
if (strcmp(ct->name, cmd) == 0 ||
(ct->altname && strcmp(ct->altname, cmd) == 0))
return (const cmdinfo_t *)ct;
}
return NULL;
}

void
add_user_command(char *optarg)
{
ncmdline++;
cmdline = realloc(cmdline, sizeof(char*) * (ncmdline));
if (!cmdline) {
perror("realloc");
exit(1);
}
cmdline[ncmdline-1] = optarg;
}

static int
args_command(
int index)
{
if (args_func)
return args_func(index);
return 0;
}

void
add_args_command(
argsfunc_t af)
{
args_func = af;
}

static void prep_fetchline(void *opaque)
{
    int *fetchable = opaque;

    qemu_aio_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL, NULL, NULL);
    *fetchable= 1;
}

static char *get_prompt(void);

void
command_loop(void)
{
int c, i, j = 0, done = 0, fetchable = 0, prompted = 0;
char *input;
char **v;
const cmdinfo_t *ct;

for (i = 0; !done && i < ncmdline; i++) {
input = strdup(cmdline[i]);
if (!input) {
fprintf(stderr,
_("cannot strdup command '%s': %s\n"),
cmdline[i], strerror(errno));
exit(1);
}
v = breakline(input, &c);
if (c) {
ct = find_command(v[0]);
if (ct) {
if (ct->flags & CMD_FLAG_GLOBAL)
done = command(ct, c, v);
else {
j = 0;
while (!done && (j = args_command(j)))
done = command(ct, c, v);
}
} else
fprintf(stderr, _("command \"%s\" not found\n"),
v[0]);
}
doneline(input, v);
}
if (cmdline) {
free(cmdline);
return;
}

while (!done) {
        if (!prompted) {
            printf("%s", get_prompt());
            fflush(stdout);
            qemu_aio_set_fd_handler(STDIN_FILENO, prep_fetchline, NULL, NULL,
                                    NULL, &fetchable);
            prompted = 1;
        }

        qemu_aio_wait();

        if (!fetchable) {
            continue;
        }
if ((input = fetchline()) == NULL)
break;
v = breakline(input, &c);
if (c) {
ct = find_command(v[0]);
if (ct)
done = command(ct, c, v);
else
fprintf(stderr, _("command \"%s\" not found\n"),
v[0]);
}
doneline(input, v);

        prompted = 0;
        fetchable = 0;
}
    qemu_aio_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL, NULL, NULL);
}

/* from libxcmd/input.c */

#if defined(ENABLE_READLINE)
# include <readline/history.h>
# include <readline/readline.h>
#elif defined(ENABLE_EDITLINE)
# include <histedit.h>
#endif

static char *
get_prompt(void)
{
static char prompt[FILENAME_MAX + 2 /*"> "*/ + 1 /*"\0"*/ ];

if (!prompt[0])
snprintf(prompt, sizeof(prompt), "%s> ", progname);
return prompt;
}

#if defined(ENABLE_READLINE)
char *
fetchline(void)
{
char *line;

line = readline(get_prompt());
if (line && *line)
add_history(line);
return line;
}
#elif defined(ENABLE_EDITLINE)
static char *el_get_prompt(EditLine *e) { return get_prompt(); }
char *
fetchline(void)
{
static EditLine *el;
static History *hist;
HistEvent hevent;
char *line;
int count;

if (!el) {
hist = history_init();
history(hist, &hevent, H_SETSIZE, 100);
el = el_init(progname, stdin, stdout, stderr);
el_source(el, NULL);
el_set(el, EL_SIGNAL, 1);
el_set(el, EL_PROMPT, el_get_prompt);
el_set(el, EL_HIST, history, (const char *)hist);
}
line = strdup(el_gets(el, &count));
if (line) {
if (count > 0)
line[count-1] = '\0';
if (*line)
history(hist, &hevent, H_ENTER, line);
}
return line;
}
#else
# define MAXREADLINESZ 1024
char *
fetchline(void)
{
char *p, *line = malloc(MAXREADLINESZ);

if (!line)
return NULL;
if (!fgets(line, MAXREADLINESZ, stdin)) {
free(line);
return NULL;
}
p = line + strlen(line);
if (p != line && p[-1] == '\n')
p[-1] = '\0';
return line;
}
#endif

static char *qemu_strsep(char **input, const char *delim)
{
    char *result = *input;
    if (result != NULL) {
        char *p;

        for (p = result; *p != '\0'; p++) {
            if (strchr(delim, *p)) {
                break;
            }
        }
        if (*p == '\0') {
            *input = NULL;
        } else {
            *p = '\0';
            *input = p + 1;
        }
    }
    return result;
}

char **
breakline(
char *input,
int *count)
{
int c = 0;
char *p;
char **rval = calloc(sizeof(char *), 1);

while (rval && (p = qemu_strsep(&input, " ")) != NULL) {
if (!*p)
continue;
c++;
rval = realloc(rval, sizeof(*rval) * (c + 1));
if (!rval) {
c = 0;
break;
}
rval[c - 1] = p;
rval[c] = NULL;
}
*count = c;
return rval;
}

void
doneline(
char *input,
char **vec)
{
free(input);
free(vec);
}

#define EXABYTES(x) ((long long)(x) << 60)
#define PETABYTES(x) ((long long)(x) << 50)
#define TERABYTES(x) ((long long)(x) << 40)
#define GIGABYTES(x) ((long long)(x) << 30)
#define MEGABYTES(x) ((long long)(x) << 20)
#define KILOBYTES(x) ((long long)(x) << 10)

long long
cvtnum(
char *s)
{
long long i;
char *sp;
int c;

i = strtoll(s, &sp, 0);
if (i == 0 && sp == s)
return -1LL;
if (*sp == '\0')
return i;

if (sp[1] != '\0')
return -1LL;

c = tolower(*sp);
switch (c) {
default:
return i;
case 'k':
return KILOBYTES(i);
case 'm':
return MEGABYTES(i);
case 'g':
return GIGABYTES(i);
case 't':
return TERABYTES(i);
case 'p':
return PETABYTES(i);
case 'e':
return EXABYTES(i);
}
return -1LL;
}

#define TO_EXABYTES(x) ((x) / EXABYTES(1))
#define TO_PETABYTES(x) ((x) / PETABYTES(1))
#define TO_TERABYTES(x) ((x) / TERABYTES(1))
#define TO_GIGABYTES(x) ((x) / GIGABYTES(1))
#define TO_MEGABYTES(x) ((x) / MEGABYTES(1))
#define TO_KILOBYTES(x) ((x) / KILOBYTES(1))

void
cvtstr(
double value,
char *str,
size_t size)
{
const char *fmt;
int precise;

precise = ((double)value * 1000 == (double)(int)value * 1000);

if (value >= EXABYTES(1)) {
fmt = precise ? "%.f EiB" : "%.3f EiB";
snprintf(str, size, fmt, TO_EXABYTES(value));
} else if (value >= PETABYTES(1)) {
fmt = precise ? "%.f PiB" : "%.3f PiB";
snprintf(str, size, fmt, TO_PETABYTES(value));
} else if (value >= TERABYTES(1)) {
fmt = precise ? "%.f TiB" : "%.3f TiB";
snprintf(str, size, fmt, TO_TERABYTES(value));
} else if (value >= GIGABYTES(1)) {
fmt = precise ? "%.f GiB" : "%.3f GiB";
snprintf(str, size, fmt, TO_GIGABYTES(value));
} else if (value >= MEGABYTES(1)) {
fmt = precise ? "%.f MiB" : "%.3f MiB";
snprintf(str, size, fmt, TO_MEGABYTES(value));
} else if (value >= KILOBYTES(1)) {
fmt = precise ? "%.f KiB" : "%.3f KiB";
snprintf(str, size, fmt, TO_KILOBYTES(value));
} else {
snprintf(str, size, "%f bytes", value);
}
}

struct timeval
tsub(struct timeval t1, struct timeval t2)
{
t1.tv_usec -= t2.tv_usec;
if (t1.tv_usec < 0) {
t1.tv_usec += 1000000;
t1.tv_sec--;
}
t1.tv_sec -= t2.tv_sec;
return t1;
}

double
tdiv(double value, struct timeval tv)
{
return value / ((double)tv.tv_sec + ((double)tv.tv_usec / 1000000.0));
}

#define HOURS(sec) ((sec) / (60 * 60))
#define MINUTES(sec) (((sec) % (60 * 60)) / 60)
#define SECONDS(sec) ((sec) % 60)

void
timestr(
struct timeval *tv,
char *ts,
size_t size,
int format)
{
double usec = (double)tv->tv_usec / 1000000.0;

if (format & TERSE_FIXED_TIME) {
if (!HOURS(tv->tv_sec)) {
snprintf(ts, size, "%u:%02u.%02u",
(unsigned int) MINUTES(tv->tv_sec),
(unsigned int) SECONDS(tv->tv_sec),
(unsigned int) usec * 100);
return;
}
format |= VERBOSE_FIXED_TIME; /* fallback if hours needed */
}

if ((format & VERBOSE_FIXED_TIME) || tv->tv_sec) {
snprintf(ts, size, "%u:%02u:%02u.%02u",
(unsigned int) HOURS(tv->tv_sec),
(unsigned int) MINUTES(tv->tv_sec),
(unsigned int) SECONDS(tv->tv_sec),
(unsigned int) usec * 100);
} else {
snprintf(ts, size, "0.%04u sec", (unsigned int) usec * 10000);
}
}


/* from libxcmd/quit.c */

static cmdinfo_t quit_cmd;

/* ARGSUSED */
static int
quit_f(
int argc,
char **argv)
{
return 1;
}

void
quit_init(void)
{
quit_cmd.name = _("quit");
quit_cmd.altname = _("q");
quit_cmd.cfunc = quit_f;
quit_cmd.argmin = -1;
quit_cmd.argmax = -1;
quit_cmd.flags = CMD_FLAG_GLOBAL;
quit_cmd.oneline = _("exit the program");

add_command(&quit_cmd);
}

/* from libxcmd/help.c */

static cmdinfo_t help_cmd;
static void help_onecmd(const char *cmd, const cmdinfo_t *ct);
static void help_oneline(const char *cmd, const cmdinfo_t *ct);

static void
help_all(void)
{
const cmdinfo_t *ct;

for (ct = cmdtab; ct < &cmdtab[ncmds]; ct++)
help_oneline(ct->name, ct);
printf(_("\nUse 'help commandname' for extended help.\n"));
}

static int
help_f(
int argc,
char **argv)
{
const cmdinfo_t *ct;

if (argc == 1) {
help_all();
return 0;
}
ct = find_command(argv[1]);
if (ct == NULL) {
printf(_("command %s not found\n"), argv[1]);
return 0;
}
help_onecmd(argv[1], ct);
return 0;
}

static void
help_onecmd(
const char *cmd,
const cmdinfo_t *ct)
{
help_oneline(cmd, ct);
if (ct->help)
ct->help();
}

static void
help_oneline(
const char *cmd,
const cmdinfo_t *ct)
{
if (cmd)
printf("%s ", cmd);
else {
printf("%s ", ct->name);
if (ct->altname)
printf("(or %s) ", ct->altname);
}
if (ct->args)
printf("%s ", ct->args);
printf("-- %s\n", ct->oneline);
}

void
help_init(void)
{
help_cmd.name = _("help");
help_cmd.altname = _("?");
help_cmd.cfunc = help_f;
help_cmd.argmin = 0;
help_cmd.argmax = 1;
help_cmd.flags = CMD_FLAG_GLOBAL;
help_cmd.args = _("[command]");
help_cmd.oneline = _("help for one or all commands");

add_command(&help_cmd);
}
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