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/*
* vmfs-tools - Tools to access VMFS filesystems
* Copyright (C) 2009 Christophe Fillot <cf@utc.fr>
* Copyright (C) 2009,2010 Mike Hommey <mh@glandium.org>
*
* 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.
*
* 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 <unistd.h>
#include <string.h>
#include <strings.h>
#include <dlfcn.h>
#include "readcmd.h"
static const cmd_t empty_cmd = { 0, };
static char *init_readline(const char *prompt);
static char *(*readline)(const char *prompt) = init_readline;
static void (*add_history)(const char *string);
/* local_readline() buffer allocation increment */
#define READLINE_INCR 256
char *local_readline(const char *prompt) {
char *buf = NULL, *buf2;
size_t len, alloc = READLINE_INCR;
if (prompt)
fprintf(stdout, "%s", prompt);
buf = malloc(alloc);
if (!buf)
return NULL;
buf2 = buf;
do {
if (!fgets(buf2, READLINE_INCR, stdin))
break;
len = strlen(buf2);
if ((len > 0) && (buf2[len-1] == '\n')) {
buf2[--len] = 0;
return buf;
}
len += (buf2 - buf);
alloc += READLINE_INCR;
if (!(buf2 = realloc(buf, alloc)))
break;
buf = buf2;
buf2 = &buf[len];
} while (1);
free(buf);
return NULL;
}
static void local_add_history(const char *string)
{
}
/* Argv allocation increment */
#define ARGV_INCR 16
/* Return a command after having prompted for it */
const cmd_t *readcmd(const char *prompt)
{
char *buf;
int i;
cmd_t *cmd = NULL;
if (!isatty(fileno(stdin)))
prompt = NULL;
if (!(buf = readline(prompt))) {
if (prompt)
fprintf(stdout, "\n");
return NULL;
}
for(i=strlen(buf)-1;(i>=0)&&(buf[i]==' ');buf[i--]=0);
if (buf[0]==0) {
free(buf);
return &empty_cmd;
}
add_history(buf);
cmd = calloc(sizeof(cmd_t),1);
cmd->buf = buf;
if ((cmd->redir = index(buf, '|')))
cmd->piped = 1;
else
cmd->redir = index(buf, '>');
if (cmd->redir && (cmd->redir != buf) && (cmd->redir[-1] == ' ')) {
char *s;
for(s=cmd->redir-1;(s>=buf)&&(*s==' ');*(s--)=0);
*(cmd->redir++) = 0;
if (!cmd->piped && *cmd->redir == '>') {
cmd->append = 1;
if (*(++cmd->redir) == '>') {
fprintf(stderr,"Unexpected token '>'\n");
free(cmd);
free(buf);
return &empty_cmd;
}
}
while (*cmd->redir == ' ')
cmd->redir++;
} else
cmd->redir = NULL;
cmd->argv = malloc(ARGV_INCR * sizeof(char *));
cmd->argv[0] = buf;
do {
while (*(cmd->argv[cmd->argc]) == ' ')
*(cmd->argv[cmd->argc]++) = 0;
if (!(++cmd->argc % ARGV_INCR)) {
char **newargv = realloc(cmd->argv,
(cmd->argc + ARGV_INCR) * sizeof(char *));
if (newargv) {
cmd->argv = newargv;
} else {
freecmd(cmd);
fprintf(stderr, "Not enough memory\n");
return NULL;
}
}
} while((cmd->argv[cmd->argc] = strchr(cmd->argv[cmd->argc - 1], ' ')));
return cmd;
}
/* Free a command */
void freecmd(const cmd_t *cmd)
{
if (!cmd || cmd == &empty_cmd)
return;
free(cmd->argv);
free(cmd->buf);
free((cmd_t *)cmd);
}
static void *dlhandle = NULL;
static char *init_readline(const char *prompt)
{
if (isatty(fileno(stdin))) {
dlhandle = dlopen("libreadline.so", RTLD_NOW);
if (!dlhandle)
dlhandle = dlopen("libreadline.so.6", RTLD_NOW);
if (!dlhandle)
dlhandle = dlopen("libreadline.so.5", RTLD_NOW);
if (dlhandle) {
readline = dlsym(dlhandle, "readline");
add_history = dlsym(dlhandle, "add_history");
if (readline && add_history)
goto readline;
}
}
readline = local_readline;
add_history = local_add_history;
readline:
return readline(prompt);
}
static __attribute__((destructor)) void close_readline(void)
{
if (dlhandle)
dlclose(dlhandle);
}
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