mirror of
https://github.com/oliverschmidt/Stream-PDM.git
synced 2024-12-22 15:31:08 +00:00
6334ca5e1b
The program requires an Enhanced //e or a IIgs with an Uthernet II. It connects to an HTTP server and streams PDM audio data.
556 lines
16 KiB
C
556 lines
16 KiB
C
/* linenoise.c -- guerrilla line editing library against the idea that a
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* line editing lib needs to be 20,000 lines of C code.
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*
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* You can find the latest source code at:
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*
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* http://github.com/antirez/linenoise
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*
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* Does a number of crazy assumptions that happen to be true in 99.9999% of
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* the 2010 UNIX computers around.
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*
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* ------------------------------------------------------------------------
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*
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* Copyright (c) 2010-2016, Salvatore Sanfilippo <antirez at gmail dot com>
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* Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ------------------------------------------------------------------------
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <conio.h>
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#ifdef __APPLE2__
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#include <apple2_filetype.h>
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#endif
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#include "linenoise.h"
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#define LINENOISE_HISTORY_MAX_LEN 20
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#define LINENOISE_MAX_LINE 256
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static char buf[LINENOISE_MAX_LINE];
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static linenoiseCompletionCallback *completionCallback = NULL;
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static int history_len = 0;
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static char **history = NULL;
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/* The linenoiseState structure represents the state during line editing.
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* We pass this state to functions implementing specific editing
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* functionalities. */
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struct linenoiseState {
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char *buf; /* Edited line buffer. */
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size_t buflen; /* Edited line buffer size. */
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const char *prompt; /* Prompt to display. */
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size_t plen; /* Prompt length. */
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size_t pos; /* Current cursor position. */
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size_t oldpos; /* Previous refresh cursor position. */
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size_t len; /* Current edited line length. */
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size_t cols; /* Number of columns in terminal. */
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int history_index; /* The history index we are currently editing. */
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};
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enum KEY_ACTION{
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CTRL_A = 1, /* Ctrl+a */
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CTRL_B = 2, /* Ctrl-b */
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CTRL_C = 3, /* Ctrl-c */
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CTRL_D = 4, /* Ctrl-d */
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CTRL_E = 5, /* Ctrl-e */
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CTRL_F = 6, /* Ctrl-f */
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CTRL_N = 14, /* Ctrl-n */
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CTRL_P = 16 /* Ctrl-p */
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};
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static void refreshLine(struct linenoiseState *l);
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/* ======================= Low level terminal handling ====================== */
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/* Try to get the number of columns in the current terminal, or assume 80
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* if it fails. */
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static int getColumns() {
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unsigned char cols, rows;
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screensize(&cols,&rows);
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return cols;
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}
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#ifdef __APPLE2__
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#pragma code-name (push, "LC")
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#endif
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/* Beep, used for completion when there is nothing to complete or when all
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* the choices were already shown. */
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static void linenoiseBeep(void) {
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putchar('\a');
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}
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/* ============================== Completion ================================ */
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/* Free a list of completion option populated by linenoiseAddCompletion(). */
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static void freeCompletions(linenoiseCompletions *lc) {
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size_t i;
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for (i = 0; i < lc->len; i++)
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free(lc->cvec[i]);
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if (lc->cvec != NULL)
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free(lc->cvec);
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}
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/* This is an helper function for linenoiseEdit() and is called when the
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* user types the <tab> key in order to complete the string currently in the
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* input.
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*
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* The state of the editing is encapsulated into the pointed linenoiseState
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* structure as described in the structure definition. */
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static int completeLine(register struct linenoiseState *ls) {
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linenoiseCompletions lc = { 0, NULL };
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int nwritten;
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char c = 0;
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completionCallback(ls->buf,&lc);
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if (lc.len == 0) {
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linenoiseBeep();
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} else {
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size_t stop = 0, i = 0;
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while(!stop) {
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/* Show completion or original buffer */
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if (i < lc.len) {
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struct linenoiseState saved;
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saved = *ls;
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ls->len = ls->pos = strlen(lc.cvec[i]);
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ls->buf = lc.cvec[i];
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refreshLine(ls);
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ls->len = saved.len;
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ls->pos = saved.pos;
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ls->buf = saved.buf;
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} else {
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refreshLine(ls);
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}
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c = cgetc();
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switch(c) {
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case '\t': /* tab */
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i = (i+1) % (lc.len+1);
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if (i == lc.len) linenoiseBeep();
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break;
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case CH_ESC: /* escape */
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/* Re-show original buffer */
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if (i < lc.len) refreshLine(ls);
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stop = 1;
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break;
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default:
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/* Update buffer and return */
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if (i < lc.len) {
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nwritten = snprintf(ls->buf,ls->buflen,"%s",lc.cvec[i]);
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ls->len = ls->pos = nwritten;
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}
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stop = 1;
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break;
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}
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}
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}
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freeCompletions(&lc);
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return c; /* Return last read character */
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}
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/* Register a callback function to be called for tab-completion. */
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void linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn) {
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completionCallback = fn;
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}
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/* This function is used by the callback function registered by the user
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* in order to add completion options given the input string when the
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* user typed <tab>. See the example.c source code for a very easy to
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* understand example. */
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void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) {
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size_t len = strlen(str);
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char *copy, **cvec;
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copy = malloc(len+1);
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if (copy == NULL) return;
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memcpy(copy,str,len+1);
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cvec = realloc(lc->cvec,sizeof(char*)*(lc->len+1));
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if (cvec == NULL) {
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free(copy);
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return;
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}
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lc->cvec = cvec;
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lc->cvec[lc->len++] = copy;
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}
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/* =========================== Line editing ================================= */
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/* Low level line refresh.
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*
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* Rewrite the currently edited line accordingly to the buffer content,
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* cursor position, and number of columns of the terminal. */
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static void refreshLine(struct linenoiseState *l) {
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char tmp;
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unsigned char y = wherey();
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size_t plen = strlen(l->prompt);
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char *buf = l->buf;
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size_t len = l->len;
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size_t pos = l->pos;
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while((plen+pos) >= l->cols) {
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buf++;
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len--;
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pos--;
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}
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while (plen+len > l->cols) {
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len--;
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}
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/* Cursor to left edge */
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gotox(0);
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/* Write the prompt */
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cputs(l->prompt);
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/* Write the current buffer content */
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tmp = buf[len];
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buf[len] = '\0';
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cputs(buf);
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buf[len] = tmp;
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/* Erase to right */
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if (wherex()) {
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cclear(l->cols-wherex());
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}
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/* Move cursor to original position. */
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gotoxy((unsigned char)(pos+plen),y);
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}
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/* Insert the character 'c' at cursor current position. */
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void linenoiseEditInsert(register struct linenoiseState *l, char c) {
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if (l->len < l->buflen) {
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if (l->len == l->pos) {
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l->buf[l->pos] = c;
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l->pos++;
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l->len++;
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l->buf[l->len] = '\0';
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if ((l->plen+l->len < l->cols)) {
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/* Avoid a full update of the line in the
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* trivial case. */
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cputc(c);
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} else {
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refreshLine(l);
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}
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} else {
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memmove(l->buf+l->pos+1,l->buf+l->pos,l->len-l->pos);
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l->buf[l->pos] = c;
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l->len++;
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l->pos++;
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l->buf[l->len] = '\0';
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refreshLine(l);
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}
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}
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}
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/* Move cursor on the left. */
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void linenoiseEditMoveLeft(struct linenoiseState *l) {
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if (l->pos > 0) {
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l->pos--;
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refreshLine(l);
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}
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}
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/* Move cursor on the right. */
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void linenoiseEditMoveRight(struct linenoiseState *l) {
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if (l->pos != l->len) {
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l->pos++;
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refreshLine(l);
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}
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}
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/* Move cursor to the start of the line. */
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void linenoiseEditMoveHome(struct linenoiseState *l) {
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if (l->pos != 0) {
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l->pos = 0;
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refreshLine(l);
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}
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}
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/* Move cursor to the end of the line. */
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void linenoiseEditMoveEnd(struct linenoiseState *l) {
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if (l->pos != l->len) {
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l->pos = l->len;
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refreshLine(l);
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}
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}
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/* Substitute the currently edited line with the next or previous history
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* entry as specified by 'dir'. */
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#define LINENOISE_HISTORY_NEXT 0
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#define LINENOISE_HISTORY_PREV 1
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void linenoiseEditHistoryNext(register struct linenoiseState *l, int dir) {
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if (history_len > 1) {
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/* Update the current history entry before to
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* overwrite it with the next one. */
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free(history[history_len - 1 - l->history_index]);
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history[history_len - 1 - l->history_index] = strdup(l->buf);
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/* Show the new entry */
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l->history_index += (dir == LINENOISE_HISTORY_PREV) ? 1 : -1;
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if (l->history_index < 0) {
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l->history_index = 0;
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return;
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} else if (l->history_index >= history_len) {
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l->history_index = history_len-1;
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return;
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}
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strncpy(l->buf,history[history_len - 1 - l->history_index],l->buflen);
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l->buf[l->buflen-1] = '\0';
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l->len = l->pos = strlen(l->buf);
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refreshLine(l);
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}
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}
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/* Delete the character at the right of the cursor without altering the cursor
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* position. Basically this is what happens with the "Delete" keyboard key. */
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void linenoiseEditDelete(register struct linenoiseState *l) {
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if (l->len > 0 && l->pos < l->len) {
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memmove(l->buf+l->pos,l->buf+l->pos+1,l->len-l->pos-1);
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l->len--;
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l->buf[l->len] = '\0';
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refreshLine(l);
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}
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}
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/* Backspace implementation. */
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void linenoiseEditBackspace(register struct linenoiseState *l) {
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if (l->pos > 0 && l->len > 0) {
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memmove(l->buf+l->pos-1,l->buf+l->pos,l->len-l->pos);
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l->pos--;
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l->len--;
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l->buf[l->len] = '\0';
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refreshLine(l);
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}
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}
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/* This function is the core of the line editing capability of linenoise.
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*
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* The resulting string is put into 'buf' when the user type enter.
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*
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* The function returns the length of the current buffer. */
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static int linenoiseEdit(const char *prompt)
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{
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struct linenoiseState l;
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/* Populate the linenoise state that we pass to functions implementing
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* specific editing functionalities. */
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l.buf = buf;
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l.buflen = LINENOISE_MAX_LINE;
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l.prompt = prompt;
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l.plen = strlen(prompt);
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l.oldpos = l.pos = 0;
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l.len = 0;
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l.cols = getColumns();
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l.history_index = 0;
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/* Buffer starts empty. */
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l.buf[0] = '\0';
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l.buflen--; /* Make sure there is always space for the nulterm */
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/* The latest history entry is always our current buffer, that
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* initially is just an empty string. */
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linenoiseHistoryAdd("");
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cputs(prompt);
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while(1) {
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char c;
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c = cgetc();
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/* Only autocomplete when the callback is set. It will return the
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* character that should be handled next. */
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if (c == '\t' && completionCallback != NULL) {
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c = completeLine(&l);
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/* Read next character when 0 */
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if (c == 0) continue;
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}
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switch(c) {
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case CH_ENTER:
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history_len--;
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free(history[history_len]);
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return (int)l.len;
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case CTRL_C:
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errno = EAGAIN;
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return -1;
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case CH_DEL: /* backspace */
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linenoiseEditBackspace(&l);
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break;
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case CTRL_D: /* ctrl-d, remove char at right of cursor. */
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if (l.len > 0) {
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linenoiseEditDelete(&l);
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}
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break;
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case CTRL_B: /* ctrl-b */
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case CH_CURS_LEFT:
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linenoiseEditMoveLeft(&l);
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break;
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case CTRL_F: /* ctrl-f */
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case CH_CURS_RIGHT:
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linenoiseEditMoveRight(&l);
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break;
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case CTRL_P: /* ctrl-p */
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case CH_CURS_UP:
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linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV);
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break;
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case CTRL_N: /* ctrl-n */
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case CH_CURS_DOWN:
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linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT);
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break;
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case CTRL_A: /* Ctrl+a, go to the start of the line */
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linenoiseEditMoveHome(&l);
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break;
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case CTRL_E: /* ctrl+e, go to the end of the line */
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linenoiseEditMoveEnd(&l);
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break;
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default:
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if (isprint(c)) linenoiseEditInsert(&l,c);
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break;
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}
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}
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return l.len;
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}
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#ifdef __APPLE2__
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#pragma code-name (pop)
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#endif
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/* The high level function that is the main API of the linenoise library. */
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char *linenoise(const char *prompt) {
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unsigned char oldcursor;
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int count;
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oldcursor = cursor(1);
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count = linenoiseEdit(prompt);
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cursor(oldcursor);
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if (count == -1) return NULL;
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return buf;
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}
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/* ================================ History ================================= */
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/* Reseet the history. */
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void linenoiseHistoryReset(void) {
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if (history) {
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int j;
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for (j = 0; j < history_len; j++)
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free(history[j]);
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free(history);
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history_len = 0;
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history = NULL;
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}
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}
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/* This is the API call to add a new entry in the linenoise history.
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* It uses a fixed array of char pointers that are shifted (memmoved)
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* when the history max length is reached in order to remove the older
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* entry and make room for the new one, so it is not exactly suitable for huge
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* histories, but will work well for a few hundred of entries.
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*
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* Using a circular buffer is smarter, but a bit more complex to handle. */
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int linenoiseHistoryAdd(const char *line) {
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char *linecopy;
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/* Initialization on first call. */
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if (history == NULL) {
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history = malloc(sizeof(char*)*LINENOISE_HISTORY_MAX_LEN);
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if (history == NULL) return 0;
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memset(history,0,(sizeof(char*)*LINENOISE_HISTORY_MAX_LEN));
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}
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/* Don't add duplicated lines. */
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if (history_len && !strcmp(history[history_len-1], line)) return 0;
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/* Add an heap allocated copy of the line in the history.
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* If we reached the max length, remove the older line. */
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linecopy = strdup(line);
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if (!linecopy) return 0;
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if (history_len == LINENOISE_HISTORY_MAX_LEN) {
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free(history[0]);
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memmove(history,history+1,sizeof(char*)*(LINENOISE_HISTORY_MAX_LEN-1));
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history_len--;
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}
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history[history_len] = linecopy;
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history_len++;
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return 1;
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}
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/* Save the history in the specified file. On success 0 is returned
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* otherwise -1 is returned. */
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int linenoiseHistorySave(const char *filename) {
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FILE *fp;
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int j;
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#ifdef __APPLE2__
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unsigned char oldfiletype = _filetype;
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_filetype = PRODOS_T_TXT;
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#endif
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fp = fopen(filename,"w");
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#ifdef __APPLE2__
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_filetype = oldfiletype;
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#endif
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if (fp == NULL) return -1;
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for (j = 0; j < history_len; j++)
|
|
fprintf(fp,"%s\n",history[j]);
|
|
fclose(fp);
|
|
return 0;
|
|
}
|
|
|
|
/* Load the history from the specified file. If the file does not exist
|
|
* zero is returned and no operation is performed.
|
|
*
|
|
* If the file exists and the operation succeeded 0 is returned, otherwise
|
|
* on error -1 is returned. */
|
|
int linenoiseHistoryLoad(const char *filename) {
|
|
FILE *fp = fopen(filename,"r");
|
|
|
|
if (fp == NULL) return -1;
|
|
while (fgets(buf,LINENOISE_MAX_LINE,fp) != NULL) {
|
|
char *p;
|
|
|
|
p = strchr(buf,'\r');
|
|
if (!p) p = strchr(buf,'\n');
|
|
if (p) *p = '\0';
|
|
linenoiseHistoryAdd(buf);
|
|
}
|
|
fclose(fp);
|
|
return 0;
|
|
}
|