first commit

Makefile

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+linenoise_example: linenoise.c example.c
+	$(CC) -Wall -W -Os -o linenoise_example linenoise.c example.c
+
+clean:
+	rm -f linenoise_example

example.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include "linenoise.h"
+
+int main(void) {
+    char buf[1024];
+    int retval;
+
+    while(1) {
+        retval = linenoise(buf,1024,"hello> ");
+        if (retval > 0) {
+            printf("echo: '%s'\n", buf);
+            linenoiseHistoryAdd(buf);
+        } else if (retval == -1) {
+            exit(1);
+        }
+    }
+    return 0;
+}

linenoise.c

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+/* linenoise.c -- guerrilla line editing library against the idea that a
+ * line editing lib needs to be 20,000 lines of C code.
+ *
+ * Does a number of crazy assumptions that happen to be true in 99.9999% of
+ * the 2010 UNIX computers around.
+ *
+ * Copyright (c) 2010, Salvatore Sanfilippo <antirez 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.
+ *   * Neither the name of Redis nor the names of its contributors may be used
+ *     to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * 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 OWNER 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.
+ *
+ * Reference: http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
+ *
+ * Works with:
+ *
+ * Linux console (TERM = Linux)
+ * Linux KDE terminal application (TERM = xterm)
+ * Linux xterm (TERM = xterm)
+ * Mac OS X iTerm (TERM = xterm)
+ *
+ * Broken with:
+ *
+ * Mac OS X default Terminal application (TERM = xterm) 
+ *
+ * TODO
+ *
+ * - Switch to gets() if $TERM is something we can't support.
+ * - Completion?
+ */
+
+#include <termios.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+static struct termios orig_termios; /* in order to restore at exit */
+static int rawmode = 0; /* for atexit() function to check if restore is needed*/
+static int atexit_registered = 0; /* register atexit just 1 time */
+static int history_max_len = 100;
+static int history_len = 0;
+char **history = NULL;
+
+static void linenoiseAtExit(void);
+int linenoiseHistoryAdd(char *line);
+
+static void freeHistory(void) {
+    if (history) {
+        int j;
+
+        for (j = 0; j < history_len; j++)
+            free(history[j]);
+        free(history);
+    }
+}
+
+static int enableRawMode(int fd) {
+    struct termios raw;
+
+    if (!isatty(STDIN_FILENO)) goto fatal;
+    if (!atexit_registered) {
+        atexit(linenoiseAtExit);
+        atexit_registered = 1;
+    }
+    if (tcgetattr(fd,&orig_termios) == -1) goto fatal;
+
+    raw = orig_termios;  /* modify the original mode */
+    /* input modes: no break, no CR to NL, no parity check, no strip char,
+     * no start/stop output control. */
+    raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
+    /* output modes - disable post processing */
+    raw.c_oflag &= ~(OPOST);
+    /* control modes - set 8 bit chars */
+    raw.c_cflag |= (CS8);
+    /* local modes - choing off, canonical off, no extended functions,
+     * no signal chars (^Z,^C) */
+    raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
+    /* control chars - set return condition: min number of bytes and timer.
+     * We want read to return every single byte, without timeout. */
+    raw.c_cc[VMIN] = 1; raw.c_cc[VTIME] = 0; /* 1 byte, no timer */
+
+    /* put terminal in raw mode after flushing */
+    if (tcsetattr(fd,TCSAFLUSH,&raw) < 0) goto fatal;
+    rawmode = 1;
+    return 0;
+
+fatal:
+    errno = ENOTTY;
+    return -1;
+}
+
+static void disableRawMode(int fd) {
+    /* Don't even check the return value as it's too late. */
+    if (rawmode && tcsetattr(fd,TCSAFLUSH,&orig_termios) != -1)
+        rawmode = 0;
+}
+
+/* At exit we'll try to fix the terminal to the initial conditions. */
+static void linenoiseAtExit(void) {
+    disableRawMode(STDIN_FILENO);
+    freeHistory();
+}
+
+static int getColumns(void) {
+    struct winsize ws;
+
+    if (ioctl(1, TIOCGWINSZ, &ws) == -1) return 80;
+    return ws.ws_col;
+}
+
+static void refreshLine(int fd, char *prompt, char *buf, size_t len, size_t pos, size_t cols) {
+    char seq[64];
+    size_t plen = strlen(prompt);
+    
+    while((plen+pos) >= cols) {
+        buf++;
+        len--;
+        pos--;
+    }
+    while (plen+len > cols) {
+        len--;
+    }
+
+    /* Cursor to left edge */
+    snprintf(seq,64,"\x1b[0G");
+    if (write(fd,seq,strlen(seq)) == -1) return;
+    /* Write the prompt and the current buffer content */
+    if (write(fd,prompt,strlen(prompt)) == -1) return;
+    if (write(fd,buf,len) == -1) return;
+    /* Erase to right */
+    snprintf(seq,64,"\x1b[0K");
+    if (write(fd,seq,strlen(seq)) == -1) return;
+    /* Move cursor to original position. */
+    snprintf(seq,64,"\x1b[0G\x1b[%dC", (int)(pos+plen));
+    if (write(fd,seq,strlen(seq)) == -1) return;
+}
+
+static int linenoisePrompt(int fd, char *buf, size_t buflen, char *prompt) {
+    size_t plen = strlen(prompt);
+    size_t pos = 0;
+    size_t len = 0;
+    size_t cols = getColumns();
+    int history_index = 0;
+
+    buf[0] = '\0';
+    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. */
+    linenoiseHistoryAdd("");
+    
+    if (write(fd,prompt,plen) == -1) return -1;
+    while(1) {
+        char c;
+        int nread;
+        char seq[2];
+
+        nread = read(fd,&c,1);
+        if (nread <= 0) return len;
+        switch(c) {
+        case 13:    /* enter */
+        case 4:     /* ctrl+d */
+            history_len--;
+            return len;
+        case 3:     /* ctrl+c */
+            errno = EAGAIN;
+            return -1;
+        case 127:   /* backspace */
+            if (pos > 0 && len > 0) {
+                memmove(buf+pos-1,buf+pos,len-pos);
+                pos--;
+                len--;
+                buf[len] = '\0';
+                refreshLine(fd,prompt,buf,len,pos,cols);
+            }
+            break;
+        case 27:    /* escape sequence */
+            if (read(fd,seq,2) == -1) break;
+            if (seq[0] == 91 && seq[1] == 68) {
+                /* left arrow */
+                if (pos > 0) {
+                    pos--;
+                    refreshLine(fd,prompt,buf,len,pos,cols);
+                }
+            } else if (seq[0] == 91 && seq[1] == 67) {
+                /* right arrow */
+                if (pos != len) {
+                    pos++;
+                    refreshLine(fd,prompt,buf,len,pos,cols);
+                }
+            } else if (seq[0] == 91 && (seq[1] == 65 || seq[1] == 66)) {
+                /* up and down arrow: history */
+                if (history_len > 1) {
+                    /* Update the current history entry before to
+                     * overwrite it with tne next one. */
+                    free(history[history_len-1-history_index]);
+                    history[history_len-1-history_index] = strdup(buf);
+                    /* Show the new entry */
+                    history_index += (seq[1] == 65) ? 1 : -1;
+                    if (history_index < 0)
+                        history_index = history_len-1;
+                    else if (history_index >= history_len)
+                        history_index = 0;
+                    strncpy(buf,history[history_len-1-history_index],buflen);
+                    buf[buflen] = '\0';
+                    len = pos = strlen(buf);
+                    refreshLine(fd,prompt,buf,len,pos,cols);
+                }
+            }
+            break;
+        default:
+            if (len < buflen) {
+                if (len == pos) {
+                    buf[pos] = c;
+                    pos++;
+                    len++;
+                    buf[len] = '\0';
+                    if (plen+len < cols) {
+                        /* Avoid a full update of the line in the
+                         * trivial case. */
+                        if (write(fd,&c,1) == -1) return -1;
+                    } else {
+                        refreshLine(fd,prompt,buf,len,pos,cols);
+                    }
+                } else {
+                    memmove(buf+pos+1,buf+pos,len-pos);
+                    buf[pos] = c;
+                    len++;
+                    pos++;
+                    buf[len] = '\0';
+                    refreshLine(fd,prompt,buf,len,pos,cols);
+                }
+            }
+            break;
+        }
+    }
+    return len;
+}
+
+int linenoise(char *buf, size_t buflen, char *prompt) {
+    int fd = STDIN_FILENO;
+    int count;
+
+    if (buflen == 0) {
+        errno = EINVAL;
+        return -1;
+    }
+    if (enableRawMode(fd) == -1) return -1;
+    count = linenoisePrompt(fd, buf, buflen, prompt);
+    disableRawMode(fd);
+    printf("\n");
+    return count;
+}
+
+/* Using a circular buffer is smarter, but a bit more complex to handle. */
+int linenoiseHistoryAdd(char *line) {
+    if (history_max_len == 0) return 0;
+    if (history == 0) {
+        history = malloc(sizeof(char*)*history_max_len);
+        if (history == NULL) return 0;
+        memset(history,0,(sizeof(char*)*history_max_len));
+    }
+    line = strdup(line);
+    if (!line) return 0;
+    if (history_len == history_max_len) {
+        memmove(history,history+sizeof(char*),sizeof(char*)*history_max_len-1);
+        history_len--;
+    }
+    history[history_len] = line;
+    history_len++;
+    return 1;
+}
+
+int linenoiseHistorySetMaxLen(int len) {
+    char **new;
+
+    if (len < 1) return 0;
+    if (history) {
+        int tocopy = history_len;
+
+        new = malloc(sizeof(char*)*len);
+        if (new == NULL) return 0;
+        if (len < tocopy) tocopy = len;
+        memcpy(new,history-sizeof(char*)*tocopy, sizeof(char*)*tocopy);
+        free(history);
+        history = new;
+    }
+    history_max_len = len;
+    if (history_len > history_max_len)
+        history_len = history_max_len;
+    return 1;
+}

linenoise.h

@@ -0,0 +1,41 @@
+/* linenoise.h -- guerrilla line editing library against the idea that a
+ * line editing lib needs to be 20,000 lines of C code.
+ *
+ * See linenoise.c for more information.
+ *
+ * Copyright (c) 2010, Salvatore Sanfilippo <antirez 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.
+ *   * Neither the name of Redis nor the names of its contributors may be used
+ *     to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * 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 OWNER 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.
+ */
+
+#ifndef __LINENOISE_H
+#define __LINENOISE_H
+
+int linenoise(char *buf, size_t buflen, char *prompt);
+int linenoiseHistoryAdd(char *line);
+int linenoiseHistorySetMaxLen(int len);
+
+#endif /* __LINENOISE_H */