Merge branch 'master' of https://github.com/bhgv/Inferno-OS-bhgv

1 files changed, 637 insertions, 0 deletions

diff --git a/libiot/linenoise/linenoise.c b/libiot/linenoise/linenoise.c
new file mode 100644
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--- /dev/null
+++ b/libiot/linenoise/linenoise.c
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+/* linenoise.c -- VERSION 1.0
+ *
+ * Guerrilla line editing library against the idea that a line editing lib
+ * needs to be 20,000 lines of C code.
+ *
+ * You can find the latest source code at:
+ *
+ *   http://github.com/antirez/linenoise
+ *
+ * Does a number of crazy assumptions that happen to be true in 99.9999% of
+ * the 2010 UNIX computers around.
+ *
+ * ------------------------------------------------------------------------
+ *
+ * Copyright (c) 2010-2014, Salvatore Sanfilippo <antirez at gmail dot com>
+ * Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
+ *
+ * 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.
+ *
+ * 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 THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS 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.
+ *
+ * ------------------------------------------------------------------------
+ *
+ * References:
+ * - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
+ * - http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
+ *
+ * Todo list:
+ * - Filter bogus Ctrl+<char> combinations.
+ * - Win32 support
+ *
+ * Bloat:
+ * - History search like Ctrl+r in readline?
+ *
+ * List of escape sequences used by this program, we do everything just
+ * with three sequences. In order to be so cheap we may have some
+ * flickering effect with some slow terminal, but the lesser sequences
+ * the more compatible.
+ *
+ * EL (Erase Line)
+ *    Sequence: ESC [ n K
+ *    Effect: if n is 0 or missing, clear from cursor to end of line
+ *    Effect: if n is 1, clear from beginning of line to cursor
+ *    Effect: if n is 2, clear entire line
+ *
+ * CUF (CUrsor Forward)
+ *    Sequence: ESC [ n C
+ *    Effect: moves cursor forward n chars
+ *
+ * CUB (CUrsor Backward)
+ *    Sequence: ESC [ n D
+ *    Effect: moves cursor backward n chars
+ *
+ * The following is used to get the terminal width if getting
+ * the width with the TIOCGWINSZ ioctl fails
+ *
+ * DSR (Device Status Report)
+ *    Sequence: ESC [ 6 n
+ *    Effect: reports the current cusor position as ESC [ n ; m R
+ *            where n is the row and m is the column
+ *
+ * When multi line mode is enabled, we also use an additional escape
+ * sequence. However multi line editing is disabled by default.
+ *
+ * CUU (Cursor Up)
+ *    Sequence: ESC [ n A
+ *    Effect: moves cursor up of n chars.
+ *
+ * CUD (Cursor Down)
+ *    Sequence: ESC [ n B
+ *    Effect: moves cursor down of n chars.
+ *
+ * When linenoiseClearScreen() is called, two additional escape sequences
+ * are used in order to clear the screen and position the cursor at home
+ * position.
+ *
+ * CUP (Cursor position)
+ *    Sequence: ESC [ H
+ *    Effect: moves the cursor to upper left corner
+ *
+ * ED (Erase display)
+ *    Sequence: ESC [ 2 J
+ *    Effect: clear the whole screen
+ *
+ */
+
+#include "luartos.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <ctype.h>
+#include <sys/status.h>
+#include <sys/types.h>
+#include <sys/list.h>
+#include <reent.h>
+
+#include <sys/mount.h>
+#include <sys/path.h>
+#include <sys/history.h>
+
+#include "linenoise.h"
+#include "lua.h"
+
+#define LINENOISE_MAX_LINE LUA_MAXINPUT
+
+/* The linenoiseState structure represents the state during line editing.
+ * We pass this state to functions implementing specific editing
+ * functionalities. */
+struct linenoiseState {
+    int ifd;            /* Terminal stdin file descriptor. */
+    int ofd;            /* Terminal stdout file descriptor. */
+    char *buf;          /* Edited line buffer. */
+    size_t buflen;      /* Edited line buffer size. */
+    const char *prompt; /* Prompt to display. */
+    size_t plen;        /* Prompt length. */
+    size_t pos;         /* Current cursor position. */
+    size_t oldpos;      /* Previous refresh cursor position. */
+    size_t len;         /* Current edited line length. */
+    size_t cols;        /* Number of columns in terminal-> */
+    size_t maxrows;     /* Maximum num of rows used so far (multiline mode) */
+    int history_index;  /* The history index we are currently editing. */
+    bool password;      /* A password is being entered. */
+};
+
+enum KEY_ACTION{
+	KEY_NULL = 0,	    /* NULL */
+	CTRL_A = 1,         /* Ctrl+a */
+	CTRL_B = 2,         /* Ctrl-b */
+	CTRL_C = 3,         /* Ctrl-c */
+	CTRL_D = 4,         /* Ctrl-d */
+	CTRL_E = 5,         /* Ctrl-e */
+	CTRL_F = 6,         /* Ctrl-f */
+	CTRL_H = 8,         /* Ctrl-h */
+	TAB = 9,            /* Tab */
+	CTRL_K = 11,        /* Ctrl+k */
+	CTRL_L = 12,        /* Ctrl+l */
+	ENTER = 13,         /* Enter */
+	CTRL_N = 14,        /* Ctrl-n */
+	CTRL_P = 16,        /* Ctrl-p */
+	CTRL_T = 20,        /* Ctrl-t */
+	CTRL_U = 21,        /* Ctrl+u */
+	CTRL_W = 23,        /* Ctrl+w */
+	ESC = 27,           /* Escape */
+	BACKSPACE =  127    /* Backspace */
+};
+
+static void refreshLine(struct linenoiseState *l);
+
+static void linenoiseHistoryAdd(struct linenoiseState *l);
+static void linenoiseHistoryGet(struct linenoiseState *l, int up);
+
+/* Debugging macro. */
+#if 0
+FILE *lndebug_fp = NULL;
+#define lndebug(...) \
+    do { \
+        if (lndebug_fp == NULL) { \
+            lndebug_fp = fopen("/tmp/lndebug.txt","a"); \
+            fprintf(lndebug_fp, \
+            "[%d %d %d] p: %d, rows: %d, rpos: %d, max: %d, oldmax: %d\n", \
+            (int)l->len,(int)l->pos,(int)l->oldpos,plen,rows,rpos, \
+            (int)l->maxrows,old_rows); \
+        } \
+        fprintf(lndebug_fp, ", " __VA_ARGS__); \
+        fflush(lndebug_fp); \
+    } while (0)
+#else
+#define lndebug(fmt, ...)
+#endif
+
+/* ======================= Low level terminal handling ====================== */
+
+/* Clear the screen. Used to handle ctrl+l */
+void linenoiseClearScreen(void) {
+    if (write(STDOUT_FILENO,"\x1b[H\x1b[2J",7) <= 0) {
+        /* nothing to do, just to avoid warning. */
+    }
+}
+
+
+/* =========================== Line editing ================================= */
+
+/* We define a very simple "append buffer" structure, that is an heap
+ * allocated string where we can append to. This is useful in order to
+ * write all the escape sequences in a buffer and flush them to the standard
+ * output in a single call, to avoid flickering effects. */
+struct abuf {
+    char *b;
+    int len;
+};
+
+static void abInit(struct abuf *ab) {
+    ab->b = NULL;
+    ab->len = 0;
+}
+
+static void abAppend(struct abuf *ab, const char *s, int len) {
+    char *new = (ab->b ? realloc(ab->b,ab->len+len) : malloc(ab->len+len));
+
+    if (new == NULL) return;
+    memcpy(new+ab->len,s,len);
+    ab->b = new;
+    ab->len += len;
+}
+
+static void abFree(struct abuf *ab) {
+    free(ab->b);
+}
+
+/* Single line low level line refresh.
+ *
+ * Rewrite the currently edited line accordingly to the buffer content,
+ * cursor position, and number of columns of the terminal. */
+static void refreshSingleLine(struct linenoiseState *l) {
+    char seq[64];
+    size_t plen = strlen(l->prompt);
+    int fd = l->ofd;
+    char *buf = l->buf;
+    size_t len = l->len;
+    size_t pos = l->pos;
+    struct abuf ab;
+
+    while((plen+pos) >= l->cols) {
+        buf++;
+        len--;
+        pos--;
+    }
+    while (plen+len > l->cols) {
+        len--;
+    }
+
+    abInit(&ab);
+    /* Cursor to left edge */
+    snprintf(seq,64,"\r");
+    abAppend(&ab,seq,strlen(seq));
+    /* Write the prompt and the current buffer content */
+    abAppend(&ab,l->prompt,strlen(l->prompt));
+    if (!l->password) {
+        abAppend(&ab,buf,len);
+    }
+    /* Erase to right */
+    snprintf(seq,64,"\x1b[0K");
+    abAppend(&ab,seq,strlen(seq));
+    /* Move cursor to original position. */
+    if (!l->password) {
+		  snprintf(seq,64,"\r\x1b[%dC", (int)(pos+plen));
+		  abAppend(&ab,seq,strlen(seq));
+		}
+    if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */
+    abFree(&ab);
+}
+
+/* Calls the two low level functions refreshSingleLine() or
+ * refreshMultiLine() according to the selected mode. */
+static void refreshLine(struct linenoiseState *l) {
+	refreshSingleLine(l);
+}
+
+/* Insert the character 'c' at cursor current position.
+ *
+ * On error writing to the terminal -1 is returned, otherwise 0. */
+int linenoiseEditInsert(struct linenoiseState *l, char c) {
+    if (l->len < l->buflen) {
+        if (l->len == l->pos) {
+            l->buf[l->pos] = c;
+            l->pos++;
+            l->len++;
+            l->buf[l->len] = '\0';
+            if ((l->plen+l->len < l->cols)) {
+                /* Avoid a full update of the line in the
+                 * trivial case. */
+                if (!l->password) {
+                    if (write(l->ofd,&c,1) == -1) return -1;
+                }
+            } else {
+                refreshLine(l);
+            }
+        } else {
+            memmove(l->buf+l->pos+1,l->buf+l->pos,l->len-l->pos);
+            l->buf[l->pos] = c;
+            l->len++;
+            l->pos++;
+            l->buf[l->len] = '\0';
+            refreshLine(l);
+        }
+    }
+    return 0;
+}
+
+/* Move cursor on the left. */
+void linenoiseEditMoveLeft(struct linenoiseState *l) {
+    if (l->pos > 0) {
+        l->pos--;
+        refreshLine(l);
+    }
+}
+
+/* Move cursor on the right. */
+void linenoiseEditMoveRight(struct linenoiseState *l) {
+    if (l->pos != l->len) {
+        l->pos++;
+        refreshLine(l);
+    }
+}
+
+/* Move cursor to the start of the line. */
+void linenoiseEditMoveHome(struct linenoiseState *l) {
+    if (l->pos != 0) {
+        l->pos = 0;
+        refreshLine(l);
+    }
+}
+
+/* Move cursor to the end of the line. */
+void linenoiseEditMoveEnd(struct linenoiseState *l) {
+    if (l->pos != l->len) {
+        l->pos = l->len;
+        refreshLine(l);
+    }
+}
+
+/* Delete the character at the right of the cursor without altering the cursor
+ * position. Basically this is what happens with the "Delete" keyboard key. */
+void linenoiseEditDelete(struct linenoiseState *l) {
+    if (l->len > 0 && l->pos < l->len) {
+        memmove(l->buf+l->pos,l->buf+l->pos+1,l->len-l->pos-1);
+        l->len--;
+        l->buf[l->len] = '\0';
+        refreshLine(l);
+    }
+}
+
+/* Backspace implementation. */
+void linenoiseEditBackspace(struct linenoiseState *l) {
+    if (l->pos > 0 && l->len > 0) {
+        memmove(l->buf+l->pos-1,l->buf+l->pos,l->len-l->pos);
+        l->pos--;
+        l->len--;
+        l->buf[l->len] = '\0';
+        refreshLine(l);
+    }
+}
+
+/* Delete the previosu word, maintaining the cursor at the start of the
+ * current word. */
+void linenoiseEditDeletePrevWord(struct linenoiseState *l) {
+    size_t old_pos = l->pos;
+    size_t diff;
+
+    while (l->pos > 0 && l->buf[l->pos-1] == ' ')
+        l->pos--;
+    while (l->pos > 0 && l->buf[l->pos-1] != ' ')
+        l->pos--;
+    diff = old_pos - l->pos;
+    memmove(l->buf+l->pos,l->buf+old_pos,l->len-old_pos+1);
+    l->len -= diff;
+    refreshLine(l);
+}
+
+/* This function is the core of the line editing capability of linenoise.
+ * It expects 'fd' to be already in "raw mode" so that every key pressed
+ * will be returned ASAP to read().
+ *
+ * The resulting string is put into 'buf' when the user type enter, or
+ * when ctrl+d is typed.
+ *
+ * The function returns the length of the current buffer. */
+static int linenoiseEdit(int stdin_fd, int stdout_fd, char *buf, size_t buflen, const char *prompt, bool password)
+{
+    struct linenoiseState *l;
+
+    l = malloc(sizeof(struct linenoiseState));
+    if (!l) {
+    	return 0;
+    }
+
+    /* Populate the linenoise state that we pass to functions implementing
+     * specific editing functionalities. */
+    l->ifd = stdin_fd;
+    l->ofd = stdout_fd;
+    l->buf = buf;
+    l->buflen = buflen;
+    l->prompt = prompt;
+    l->plen = strlen(prompt);
+    l->oldpos = l->pos = 0;
+    l->len = 0;
+    l->cols = buflen;
+    l->maxrows = 0;
+    l->history_index = -1;
+    l->password = password;
+
+    /* Buffer starts empty. */
+    l->buf[0] = '\0';
+    l->buflen--; /* Make sure there is always space for the nulterm */
+
+    /* The latest history entry is always our current buffer, that
+     * initially is just an empty string. */
+        
+    if (write(l->ofd,prompt,l->plen) == -1) {
+    	free(l);
+    	return -1;
+    }
+
+    while(1) {
+        char c;
+        int nread;
+        char seq[3];
+
+        nread = read(l->ifd,&c,1);
+
+        if (nread <= 0) {
+        	int len = l->len;
+        	free(l);
+        	return len;
+        }
+
+        switch(c) {
+        case ENTER:    /* enter */
+            if (l->len > 0) {
+                if(!l->password) linenoiseHistoryAdd(l);
+            }
+            
+            int len = l->len;
+            free(l);
+            return (int)len;
+        case CTRL_C:     /* ctrl-c */
+            errno = EAGAIN;
+        	free(l);
+            return -1;
+        case BACKSPACE:   /* backspace */
+        case 8:     /* ctrl-h */
+            linenoiseEditBackspace(l);
+            break;
+        case CTRL_D:     /* ctrl-d, remove char at right of cursor, or if the
+                            line is empty, act as end-of-file. */
+            if (l->len > 0) {
+                linenoiseEditDelete(l);
+            } else {
+            	free(l);
+                return -1;
+            }
+            break;
+        case CTRL_T:    /* ctrl-t, swaps current character with previous. */
+            if (l->pos > 0 && l->pos < l->len) {
+                int aux = buf[l->pos-1];
+                buf[l->pos-1] = buf[l->pos];
+                buf[l->pos] = aux;
+                if (l->pos != l->len-1) l->pos++;
+                refreshLine(l);
+            }
+            break;
+        case CTRL_B:     /* ctrl-b */
+            linenoiseEditMoveLeft(l);
+            break;
+        case CTRL_F:     /* ctrl-f */
+            linenoiseEditMoveRight(l);
+            break;
+        case CTRL_P:    /* ctrl-p */
+            break;
+        case CTRL_N:    /* ctrl-n */
+            break;
+        case ESC:    /* escape sequence */
+            /* Read the next two bytes representing the escape sequence.
+             * Use two calls to handle slow terminals returning the two
+             * chars at different times. */
+            if (read(l->ifd,seq,1) == -1) break;
+            if (read(l->ifd,seq+1,1) == -1) break;
+
+            /* ESC [ sequences. */
+            if (seq[0] == '[') {
+                if (seq[1] >= '0' && seq[1] <= '9') {
+                    /* Extended escape, read additional byte. */
+                    if (read(l->ifd,seq+2,1) == -1) break;
+                    if (seq[2] == '~') {
+                        switch(seq[1]) {
+                        case '3': /* Delete key. */
+                            linenoiseEditDelete(l);
+                            break;
+                        }
+                    }
+                } else {
+                    switch(seq[1]) {
+                    case 'A': /* Up */
+                        linenoiseHistoryGet(l,1);
+                        break;
+                    case 'B': /* Down */
+                        linenoiseHistoryGet(l,0);
+                        break;
+                    case 'C': /* Right */
+                        linenoiseEditMoveRight(l);
+                        break;
+                    case 'D': /* Left */
+                        linenoiseEditMoveLeft(l);
+                        break;
+                    case 'H': /* Home */
+                        linenoiseEditMoveHome(l);
+                        break;
+                    case 'F': /* End*/
+                        linenoiseEditMoveEnd(l);
+                        break;
+                    }
+                }
+            }
+
+            /* ESC O sequences. */
+            else if (seq[0] == 'O') {
+                switch(seq[1]) {
+                case 'H': /* Home */
+                    linenoiseEditMoveHome(l);
+                    break;
+                case 'F': /* End*/
+                    linenoiseEditMoveEnd(l);
+                    break;
+                }
+            }
+            break;
+        default:
+            if (linenoiseEditInsert(l,c)) {
+            	free(l);
+            	return -1;
+            }
+            break;
+        case CTRL_U: /* Ctrl+u, delete the whole line. */
+            buf[0] = '\0';
+            l->pos = l->len = 0;
+            refreshLine(l);
+            break;
+        case CTRL_K: /* Ctrl+k, delete from current to end of line. */
+            buf[l->pos] = '\0';
+            l->len = l->pos;
+            refreshLine(l);
+            break;
+        case CTRL_A: /* Ctrl+a, go to the start of the line */
+            linenoiseEditMoveHome(l);
+            break;
+        case CTRL_E: /* ctrl+e, go to the end of the line */
+            linenoiseEditMoveEnd(l);
+            break;
+        case CTRL_L: /* ctrl+l, clear screen */
+            linenoiseClearScreen();
+            refreshLine(l);
+            break;
+        case CTRL_W: /* ctrl+w, delete previous word */
+            linenoiseEditDeletePrevWord(l);
+            break;
+        }
+    }
+
+    int len = l->len;
+	free(l);
+
+    return len;
+}
+
+/* This function calls the line editing function linenoiseEdit() using
+ * the STDIN file descriptor set in raw mode. */
+static int linenoiseRaw(char *buf, size_t buflen, const char *prompt, bool password) {
+    int count;
+
+    count = linenoiseEdit(fileno(__getreent()->_stdin), fileno(__getreent()->_stdout), buf, buflen, prompt, password);
+    printf("\n");
+
+    return count;
+}
+
+static void linenoiseHistoryAdd(struct linenoiseState *l) {
+    if (!status_get(STATUS_LUA_HISTORY)) return;
+
+    history_add(l->buf);
+    
+    l->history_index = -1;
+}
+
+static void linenoiseHistoryGet(struct linenoiseState *l, int up) {
+    if (!status_get(STATUS_LUA_HISTORY)) return;
+    
+    int res = history_get(l->history_index, up, l->buf, l->cols);
+    if (res >= -1) {
+        l->history_index = res;
+        l->len = strlen(l->buf);
+        l->pos = l->len;
+    }
+
+    refreshLine(l);
+}
+
+void linenoiseHistoryClear() {
+    if (status_get(STATUS_LUA_HISTORY)) return;
+
+    char fname[PATH_MAX + 1];
+
+    if (!mount_history_file(fname, sizeof(fname))) {
+        return;
+    }
+
+    remove(fname);
+}
+
+/* The high level function that is the main API of the linenoise library.
+ * This function checks if the terminal has basic capabilities, just checking
+ * for a blacklist of stupid terminals, and later either calls the line
+ * editing function or uses dummy fgets() so that you will be able to type
+ * something even in the most desperate of the conditions. */
+int linenoisePassword(char *buf, const char *prompt, bool password) {
+    int count;
+    count = linenoiseRaw(buf,LINENOISE_MAX_LINE,prompt,password);
+    if (count == -1) return -1;
+    return count;
+}
+
+int linenoise(char *buf, const char *prompt) {
+    return linenoisePassword(buf, prompt, false);
+}