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101 lines
2.1 KiB
C
101 lines
2.1 KiB
C
/*
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* Copyright (C) 2013 Intel Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <ctype.h>
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#include "history.h"
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/*
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* Very simple history storage for easy usage of tool
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*/
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#define HISTORY_DEPTH 20
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#define LINE_SIZE 100
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static char lines[HISTORY_DEPTH][LINE_SIZE];
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static int last_line = 0;
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static int history_size = 0;
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/* TODO: Storing history not implemented yet */
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void history_store(const char *filename)
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{
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}
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/* Restoring history from file */
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void history_restore(const char *filename)
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{
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char line[1000];
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FILE *f = fopen(filename, "rt");
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if (f == NULL)
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return;
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for (;;) {
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if (fgets(line, 1000, f) != NULL) {
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int l = strlen(line);
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while (l > 0 && isspace(line[--l]))
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line[l] = 0;
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if (l > 0)
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history_add_line(line);
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} else
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break;
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}
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fclose(f);
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}
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/* Add new line to history buffer */
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void history_add_line(const char *line)
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{
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if (line == NULL || strlen(line) == 0)
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return;
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if (strcmp(line, lines[last_line]) == 0)
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return;
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last_line = (last_line + 1) % HISTORY_DEPTH;
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strncpy(&lines[last_line][0], line, LINE_SIZE - 1);
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if (history_size < HISTORY_DEPTH)
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history_size++;
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}
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/*
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* Get n-th line from history
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* 0 - means latest
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* -1 - means oldest
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* return -1 if there is no such line
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*/
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int history_get_line(int n, char *buf, int buf_size)
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{
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if (n == -1)
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n = history_size - 1;
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if (n >= history_size || buf_size == 0 || n < 0)
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return -1;
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strncpy(buf,
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&lines[(HISTORY_DEPTH + last_line - n) % HISTORY_DEPTH][0],
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buf_size - 1);
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buf[buf_size - 1] = 0;
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return n;
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}
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