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/*
* Copyright (C) 2015 - 2018, IBEROXARXA SERVICIOS INTEGRALES, S.L.
* Copyright (C) 2015 - 2018, Jaume Olivé Petrus (jolive@whitecatboard.org)
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
* * The WHITECAT logotype cannot be changed, you can remove it, but you
* cannot change it in any way. The WHITECAT logotype is:
*
* /\ /\
* / \_____/ \
* /_____________\
* W H I T E C A T
*
* * Redistributions in binary form must retain all copyright notices printed
* to any local or remote output device. This include any reference to
* Lua RTOS, whitecatboard.org, Lua, and other copyright notices that may
* appear in the future.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Lua RTOS, shell history functions
*
*/
#include "history.h"
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <sys/tail.h>
#include <sys/mount.h>
#include <sys/status.h>
#include <sys/path.h>
static void history_add_internal(const char *buf) {
// Get the history file name
char fname[PATH_MAX + 1];
if (!mount_history_file(fname, sizeof(fname))) {
return;
}
int retries = 0;
again: {
// Open the history file
FILE *fp = fopen(fname,"a");
if (!fp) {
// File not found, try to create it, and open again
mkfile(fname);
fp = fopen(fname,"a");
if (!fp) {
return;
}
}
// Get file size
long size;
if ((size = ftell(fp)) < 0) {
fclose(fp);
return;
}
// Write to history file
int len = strlen(buf);
int no_space = 0;
if (fwrite(buf, 1, len, fp) != len) {
no_space = (errno == ENOSPC);
}
if (!no_space) {
if (fflush(fp) == EOF) {
no_space = (errno == ENOSPC);
}
}
if (no_space) {
// Truncate file to the original size
if (ftruncate(fileno(fp), size) < 0) {
fclose(fp);
return;
}
if (retries == 0) {
// Tail file
fclose(fp);
file_tails(fname, fp->_blksize);
retries++;
goto again;
}
}
fclose(fp);
}
}
void history_add(const char *line) {
history_add_internal("\n");
history_add_internal(line);
}
int history_get(int index, int up, char *buf, int buflen) {
// Get the history file name
char fname[PATH_MAX + 1];
if (!mount_history_file(fname, sizeof(fname))) {
return -2;
}
// Open history file
FILE *fp = fopen(fname,"r");
if (!fp) {
// File not found, try to create it, and open again
mkfile(fname);
fp = fopen(fname,"r");
if (!fp) {
return -2;
}
}
int pos, len, new_pos;
char c;
if (index == -1) {
fseek(fp, 0, SEEK_END);
pos = ftell(fp);
} else {
pos = index;
}
if ((pos == 0) && (up)) {
fclose(fp);
return -3;
}
new_pos = pos;
while ((pos >= 0) && !feof(fp)) {
if (up)
fseek(fp, --pos, SEEK_SET);
else
fseek(fp, ++pos, SEEK_SET);
c = fgetc(fp);
if (c == '\n') {
break;
}
}
new_pos = pos;
if ((pos >= 0) && !feof(fp)) {
// Get line
fgets(buf, buflen, fp);
len = strlen(buf);
// Strip \r \n chars at the end, if present
while ((buf[len - 1] == '\r') || (buf[len - 1] == '\n')) {
len--;
}
buf[len] = '\0';
} else {
if (feof(fp))
new_pos = -1;
else
new_pos = 0;
buf[0] = 0;
}
fclose(fp);
return new_pos;
}
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