[388] | 1 | /**
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| 2 | * @file text_history.c
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| 3 | * @author CuBeatSystems
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| 4 | * @author Shinichiro Nakamura
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| 5 | * @copyright
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| 6 | * ===============================================================
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| 7 | * Natural Tiny Shell (NT-Shell) Version 0.3.1
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| 8 | * ===============================================================
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| 9 | * Copyright (c) 2010-2016 Shinichiro Nakamura
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| 10 | *
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| 11 | * Permission is hereby granted, free of charge, to any person
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| 12 | * obtaining a copy of this software and associated documentation
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| 13 | * files (the "Software"), to deal in the Software without
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| 14 | * restriction, including without limitation the rights to use,
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| 15 | * copy, modify, merge, publish, distribute, sublicense, and/or
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| 16 | * sell copies of the Software, and to permit persons to whom the
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| 17 | * Software is furnished to do so, subject to the following
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| 18 | * conditions:
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| 19 | *
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| 20 | * The above copyright notice and this permission notice shall be
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| 21 | * included in all copies or substantial portions of the Software.
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| 22 | *
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| 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 25 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 27 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 28 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 29 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 30 | * OTHER DEALINGS IN THE SOFTWARE.
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| 31 | */
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| 32 |
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| 33 | #include <string.h>
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| 34 | #include "text_history.h"
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| 35 | #include "core/ntlibc.h"
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| 36 |
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| 37 | /**
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| 38 | * @brief Initialize this module.
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| 39 | *
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| 40 | * @param p A pointer to the handler.
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| 41 | */
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| 42 | void text_history_init(text_history_t *p)
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| 43 | {
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| 44 | int i;
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| 45 | p->rp = 0;
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| 46 | p->wp = 0;
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| 47 | for (i = 0; i < (int)sizeof(p->history); i++) {
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| 48 | p->history[i] = 0;
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| 49 | }
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| 50 | }
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| 51 |
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| 52 | /**
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| 53 | * @brief Write to the history.
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| 54 | *
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| 55 | * @param p A pointer to the handler.
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| 56 | * @param buf A pointer to the buffer.
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| 57 | */
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| 58 | int text_history_write(text_history_t *p, char *buf)
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| 59 | {
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| 60 | char *sp = p->history + (TEXTHISTORY_MAXLEN * p->wp);
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| 61 | if (buf[0] == '\0') {
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| 62 | return 0;
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| 63 | }
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| 64 | while (*buf) {
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| 65 | *sp = *buf;
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| 66 | sp++;
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| 67 | buf++;
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| 68 | }
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| 69 | *sp = '\0';
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| 70 | p->wp = (p->wp + 1) % TEXTHISTORY_DEPTH;
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| 71 | p->rp = p->wp;
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| 72 | return 1;
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| 73 | }
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| 74 |
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| 75 | /**
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| 76 | * @brief Read from the history.
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| 77 | *
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| 78 | * @param p A pointer to the handler.
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| 79 | * @param buf A pointer to the buffer.
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| 80 | * @param siz A size of the buffer.
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| 81 | */
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| 82 | int text_history_read(text_history_t *p, char *buf, const int siz)
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| 83 | {
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| 84 | char *sp = p->history + (TEXTHISTORY_MAXLEN * p->rp);
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| 85 | int n = 0;
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| 86 | while (*sp) {
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| 87 | *buf = *sp;
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| 88 | buf++;
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| 89 | sp++;
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| 90 | n++;
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| 91 | if (siz - 1 <= n) {
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| 92 | break;
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| 93 | }
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| 94 | }
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| 95 | *buf = '\0';
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| 96 | return n;
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| 97 | }
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| 98 |
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| 99 | /**
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| 100 | * @brief Change the pointing location to the next.
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| 101 | *
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| 102 | * @param p A pointer to the handler.
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| 103 | */
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| 104 | int text_history_read_point_next(text_history_t *p)
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| 105 | {
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| 106 | int n = (p->rp + 1) % TEXTHISTORY_DEPTH;
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| 107 | if (n != p->wp) {
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| 108 | p->rp = n;
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| 109 | return 1;
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| 110 | }
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| 111 | return 0;
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| 112 | }
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| 113 |
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| 114 | /**
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| 115 | * @brief Change the pointing location to the previous.
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| 116 | *
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| 117 | * @param p A pointer to the handler.
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| 118 | */
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| 119 | int text_history_read_point_prev(text_history_t *p)
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| 120 | {
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| 121 | int n = (p->rp == 0) ? (TEXTHISTORY_DEPTH - 1) : (p->rp - 1);
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| 122 | if (n != p->wp) {
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| 123 | char *sp = p->history + (TEXTHISTORY_MAXLEN * n);
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| 124 | if (*sp != '\0') {
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| 125 | p->rp = n;
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| 126 | return 1;
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| 127 | }
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| 128 | }
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| 129 | return 0;
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| 130 | }
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| 131 |
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| 132 | /**
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| 133 | * @brief Find the given text string from the text history.
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| 134 | *
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| 135 | * @param p A pointer to the handler.
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| 136 | * @param index An index number of the history.
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| 137 | * @param text The target text string.
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| 138 | * @param buf A pointer to the buffer.
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| 139 | * @param siz A size of the buffer.
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| 140 | *
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| 141 | * @retval 0 Success.
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| 142 | * @retval !0 Failure.
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| 143 | */
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| 144 | int text_history_find(text_history_t *p,
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| 145 | const int index, const char *text,
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| 146 | char *buf, const int siz)
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| 147 | {
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| 148 | const int text_len = strlen((const char *)text);
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| 149 | int found = 0;
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| 150 | int i;
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| 151 | for (i = 0; i < TEXTHISTORY_DEPTH; i++) {
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| 152 | int target = (p->rp + i) % TEXTHISTORY_DEPTH;
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| 153 | char *txtp = p->history + (TEXTHISTORY_MAXLEN * target);
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| 154 | const int target_len = strlen((const char *)txtp);
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| 155 | int comp_len = (target_len < text_len) ? target_len : text_len;
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| 156 | if ((ntlibc_strncmp(
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| 157 | (const char *)txtp,
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| 158 | (const char *)text, comp_len) == 0) && (comp_len > 0)) {
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| 159 | if (found == index) {
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| 160 | if (siz <= strlen(txtp)) {
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| 161 | return -1;
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| 162 | }
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| 163 | strcpy((char *)buf, (char *)txtp);
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| 164 | return 0;
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| 165 | }
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| 166 | found++;
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| 167 | }
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| 168 | }
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| 169 | return -1;
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| 170 | }
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