109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
#include "platform.h"
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#include "linput.h"
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#include "lua.h"
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#include "lauxlib.h"
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#include <stdio.h>
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#include <string.h>
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static struct input_state {
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char *data;
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int line_pos;
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size_t len;
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const char *prompt;
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char last_nl_char;
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} ins = {
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.prompt = "? ", // prompt should never be allowed to be null
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};
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#define NUL '\0'
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#define BS '\010'
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#define CR '\r'
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#define LF '\n'
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#define DEL 0x7f
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#define BS_OVER "\010 \010"
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bool input_echo = true;
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bool run_input = true;
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void input_setprompt (const char *prompt) {
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if (prompt == NULL)
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{
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fprintf(stderr, "Error: attempted to set a null prompt?!");
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return;
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}
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ins.prompt = prompt;
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}
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/*
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** The input state (ins) is private, so input_setup() exposes the necessary
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** access to public properties and is called in user_init() before the Lua
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** enviroment is initialised.
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*/
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void input_setup(int bufsize, const char *prompt) {
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// Initialise non-zero elements
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ins.data = malloc(bufsize);
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ins.len = bufsize;
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// Call to get the prompt error checking
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input_setprompt(prompt);
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}
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size_t feed_lua_input(const char *buf, size_t n)
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{
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for (size_t i = 0; i < n; ++i) {
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char ch = buf[i];
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if (!run_input) // We're no longer interested in the remaining bytes
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return i;
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/* handle CR & LF characters and aggregate \n\r and \r\n pairs */
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char tmp_last_nl_char = ins.last_nl_char;
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/* handle CR & LF characters
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filters second char of LF&CR (\n\r) or CR&LF (\r\n) sequences */
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if ((ch == CR && tmp_last_nl_char == LF) || // \n\r sequence -> skip \r
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(ch == LF && tmp_last_nl_char == CR)) // \r\n sequence -> skip \n
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{
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continue;
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}
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/* backspace key */
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if (ch == DEL || ch == BS) {
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if (ins.line_pos > 0) {
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if(input_echo) fwrite(BS_OVER, strlen(BS_OVER), 1, stdout);
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ins.line_pos--;
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}
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ins.data[ins.line_pos] = 0;
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continue;
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}
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/* end of data */
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if (ch == CR || ch == LF) {
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ins.last_nl_char = ch;
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if (input_echo) putchar(LF);
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if (ins.line_pos == 0) {
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/* Get a empty line, then go to get a new line */
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fwrite(ins.prompt, strlen(ins.prompt), 1, stdout);
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fflush(stdout);
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} else {
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ins.data[ins.line_pos++] = LF;
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lua_input_string(ins.data, ins.line_pos);
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ins.line_pos = 0;
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}
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continue;
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}
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else
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ins.last_nl_char = NUL;
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if(input_echo) putchar(ch);
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/* it's a large line, discard it */
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if ( ins.line_pos + 1 >= ins.len ){
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ins.line_pos = 0;
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}
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ins.data[ins.line_pos++] = ch;
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}
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return n; // we consumed/buffered all the provided data
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}
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