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JohnAlexINLJohnAlexINL
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‎error.c‎

Lines changed: 7 additions & 0 deletions
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void ok (char *src, char *message) {
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printf(txtG "[%s] " txtW "%s\n", src, message);
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}
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void error (char *src, char *message) {
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printf(txtR "[%s] " txtW "%s\n", src, message);
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exit(false);
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}

‎file.c‎

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int file_read(char *filename, char *buffer, int max) {
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FILE *fp = fopen(filename, "rb");
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if ( fp == NULL ) { return false; }
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int cursor = 0; char c; while(cursor < max -1) {
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c = fgetc(fp);
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if( feof(fp) ) { break; }
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buffer[cursor] = c; cursor++;
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} fclose(fp); return cursor;
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}
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int file_write (char *filename, char *buffer, int max) {
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FILE *fp = fopen(filename, "w+");
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if ( fp == NULL ) { return false; }
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int cursor; for (cursor = 0; cursor < max; cursor++) {
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if (fputc(buffer[cursor], fp) == EOF) { fclose(fp); return false; }
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} fclose(fp); return cursor;
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}

‎nex.c‎

Lines changed: 137 additions & 0 deletions
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#include <stdio.h>
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#include <stdbool.h>
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#include <string.h>
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#include "tui.c"
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#include "error.c"
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#include "file.c"
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int filelength; int buffersize;
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char *buffer;
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int edity = 0; int editp = 0; /* viewport y & file position */
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#define Height 16
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#define Columns 32 /* 3 chars: "00 " */
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#define ScreenFill Height*Columns
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#define version "nex version 0.0.0, https://Modula.dev"
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void printCommand(char *keys, char *command) {
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int len = strlen(keys)+strlen(command);
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printf(txtK bxtW "%s" reset " %s ", keys, command);
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while(len<20) { printf(" "); len++; }
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}
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char *insert(int position, char character){
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if (filelength+1 >= buffersize) { buffersize *= 2; buffer = realloc(buffer, buffersize); }
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memcpy(buffer+position+1, buffer+position, filelength-position);
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buffer[position] = character;
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return buffer;
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}
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char *delete(int position){
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memcpy(buffer+position, buffer+position+1, filelength-position);
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if (filelength <= buffersize/2) { buffersize /= 2; buffer = realloc(buffer, buffersize); }
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return buffer;
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}
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void save(char *filename) { file_write(filename, buffer, filelength); }
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void refresh(){
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tui_clear(); printf(txtK bxtW version reset " File Size %d bytes (%x)\n", filelength, filelength);
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printf(txtP" 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F"reset);
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int c=(edity*Columns); int end=(edity*Columns)+ScreenFill;
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while(c < end && (c < filelength || c == 0)) {
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if (c % Columns == 0) { printf("\n"txtP"%04x "reset, c); }
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if (c == editp)
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{ printf(txtW bxtB blink""); }
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else {
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if (buffer[c]==0) { printf(txtR""); }
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else if (buffer[c]<32 || buffer[c]>126) { printf(txtG""); }
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}
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int h = (buffer[c] >> 4)&15;
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int l = buffer[c] & 15;
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printf("%1x%1x"reset" ", h, l);
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c++;
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} printf("\n");
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tui_row(20);
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printCommand("Arrows", "Navigate");
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printCommand("Space", "Insert Zeros");
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printCommand("Z", "Delete character");
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printf("\n");
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printCommand("Ctrl+X", "Save");
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printCommand("Ctrl+C", "Quit");
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printf("\n");
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}
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void quit(){
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terminal_reset_terminal_mode(&original_term);
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tui_clear(); tui_col(0); tui_row(0);
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exit(0);
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}
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#define initsize 1024 * 1024 * 4
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int main(int argc, char **argv) {
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if (argc != 2) { error("nex", "expects a filename as input"); }
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if (argv[1][0] == '-') {
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if (argv[1][1] == 'v') { ok("nex", version "\n"); }
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if (argv[1][1] == 'h') { ok("nex", "\n nex (filename) opens and edits a file in hex"); }
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}
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char *filename = argv[1];
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buffer = malloc(sizeof(char)*initsize); buffersize = initsize;
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filelength = file_read(filename, buffer, initsize);
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if (filelength == false) { filelength = 1; buffer[0] = 0; }
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refresh();
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char charcode; bool changed = false; int fileheight = (filelength / Height);
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bool escaped = false; bool leftbracket = false; char value = 1;
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while(true) {
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charcode = tui_input();
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/*if (charcode != 0) { printf("[%x] ", (int)(charcode)); fflush(stdout); }*/
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if (charcode == 0) { usleep(1000); continue; }
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switch(charcode) {
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case 0: break;
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case CTRL_C: quit(); break;
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case CTRL_X: save(filename); break;
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case '\e': escaped = true; break;
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case '[': leftbracket = true; break;
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case ' ': buffer = insert(editp, '\0'); changed = true; filelength++; break;
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case 'z': if (filelength>0) { buffer = delete(editp); changed = true; filelength--; } break;
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case ARROW_LEFT:
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if (escaped == true && leftbracket == true )
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if (editp > 0) { editp--; } changed=true; break;
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case ARROW_RIGHT:
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if (escaped == true && leftbracket == true )
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editp++; if (editp >= filelength ) { editp = filelength-1; } changed=true; break;
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case ARROW_UP:
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if (escaped == true && leftbracket == true ) {
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if (editp > 31) { editp-=32;}
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if ( edity * Columns > editp ) { edity--; }
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changed=true;
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} break;
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case ARROW_DOWN:
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if (escaped == true && leftbracket == true ) {
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if (editp <= filelength - 32) { editp+=32;}
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if ((edity+Height-1) * Columns < editp ) { edity++; }
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changed=true;
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} break;
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case '0': if (value==1) {value = 0x00;} else { value += 0x00; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case '1': if (value==1) {value = 0x10;} else { value += 0x01; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case '2': if (value==1) {value = 0x20;} else { value += 0x02; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case '3': if (value==1) {value = 0x30;} else { value += 0x03; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case '4': if (value==1) {value = 0x40;} else { value += 0x04; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case '5': if (value==1) {value = 0x50;} else { value += 0x05; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case '6': if (value==1) {value = 0x60;} else { value += 0x06; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case '7': if (value==1) {value = 0x70;} else { value += 0x07; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case '8': if (value==1) {value = 0x80;} else { value += 0x08; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case '9': if (value==1) {value = 0x90;} else { value += 0x09; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case 'a': if (value==1) {value = 0xA0;} else { value += 0x0A; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case 'b': if (value==1) {value = 0xB0;} else { value += 0x0B; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case 'c': if (value==1) {value = 0xC0;} else { value += 0x0C; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case 'd': if (value==1) {value = 0xD0;} else { value += 0x0D; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case 'e': if (value==1) {value = 0xE0;} else { value += 0x0E; buffer[editp]=value; value=1; editp++; changed=true;} break;
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case 'f': if (value==1) {value = 0xF0;} else { value += 0x0F; buffer[editp]=value; value=1; editp++; changed=true;} break;
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default: escaped = false; leftbracket = false; changed = true;
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}
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if (changed == true) { refresh(); changed = false; }
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}
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}

‎tui.c‎

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// REQUIRES <stdio.h> <termios.h> <sys/select.h>
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#ifndef TUI
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#define TUI
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <termios.h>
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#include <sys/select.h>
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#endif
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#define CTRL_C 3
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#define CTRL_D 4
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#define CTRL_Q 17
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#define CTRL_X 24
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#define CTRL_ESC 27
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#define BACKSPACE 8 /* '\b' */
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#define ARROW_LEFT 0x44
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#define ARROW_RIGHT 0x43
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#define ARROW_UP 0x41
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#define ARROW_DOWN 0x42
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#define block_100 "█"
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#define block_75 "▓"
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#define block_50 "▒"
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#define block_25 "░"
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#define block_half "▄"
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#define block_check "▚"
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#define txtK "\e[0;30m" // black
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#define txtR "\e[0;31m"
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#define txtG "\e[0;32m"
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#define txtY "\e[0;33m"
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#define txtB "\e[0;34m"
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#define txtP "\e[0;35m"
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#define txtC "\e[0;36m"
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#define txtW "\e[0;37m"
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#define bxtR "\e[41m"
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#define bxtG "\e[42m"
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#define bxtY "\e[43m"
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#define bxtB "\e[44m"
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#define bxtP "\e[45m"
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#define bxtC "\e[46m"
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#define bxtW "\e[47m"
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#define reset "\e[0m"
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#define blink "\e[5m"
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void tui_return() { printf("\e[0F"); }
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void tui_row(int y) { printf("\e[H\e[%dB", y); }
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void tui_col(int x) { printf("\e[%dG", x); }
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void tui_position(int x, int y) { tui_row(y); tui_col(x); }
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void tui_clear() { tui_position(0,0); printf("\e[0J"); }
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void tui_loadbar(int x, char *colorA, char *colorB) {
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printf("\n"); tui_col(0); printf(colorA);
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int i; for (i=0; i < 80; i++) {
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if ( i > x ) { printf(colorB); }
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printf(block_100);
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} printf(txtW "\n");
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}
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// http://www.lihaoyi.com/post/BuildyourownCommandLinewithANSIescapecodes.html#user-input
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/*
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void terminal_set_raw_mode() { struct termios term; tcgetattr(STDIN_FILENO, &term); term.c_lflag &= ~(ICANON | ECHO); tcsetattr(STDIN_FILENO, TCSANOW, &term); }
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void terminal_reset_terminal_mode(struct termios *original_term) { tcsetattr(STDIN_FILENO, TCSANOW, original_term); }
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char tui_input() {
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// Save the original terminal attributes
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struct termios original_term; tcgetattr(STDIN_FILENO, &original_term); terminal_set_raw_mode();
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char ch = 0; struct timeval tv; fd_set readfds;
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FD_ZERO(&readfds); FD_SET(STDIN_FILENO, &readfds);
73+
tv.tv_sec = 0;
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tv.tv_usec = 0; // Set timeout to 0 for non-blocking
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int retval = select(STDIN_FILENO + 1, &readfds, NULL, NULL, &tv);
77+
if (retval == -1) { perror("select");
78+
} else if (retval) { read(STDIN_FILENO, &ch, 1); }
79+
terminal_reset_terminal_mode(&original_term);
80+
return ch;
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}
82+
*/
83+
void terminal_set_raw_mode() {
84+
struct termios term;
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tcgetattr(STDIN_FILENO, &term);
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term.c_lflag &= ~(ICANON | ECHO);
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tcsetattr(STDIN_FILENO, TCSANOW, &term);
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}
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void terminal_reset_terminal_mode(struct termios *original_term) {
91+
tcsetattr(STDIN_FILENO, TCSANOW, original_term);
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}
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struct termios original_term;
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char tui_input() {
96+
//struct termios original_term;
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tcgetattr(STDIN_FILENO, &original_term);
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terminal_set_raw_mode();
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char ch = 0;
101+
struct timeval tv;
102+
fd_set readfds;
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FD_ZERO(&readfds);
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FD_SET(STDIN_FILENO, &readfds);
106+
tv.tv_sec = 0;
107+
tv.tv_usec = 0;
108+
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int retval = select(STDIN_FILENO + 1, &readfds, NULL, NULL, &tv);
110+
if (retval == -1) {
111+
perror("select");
112+
} else if (retval) {
113+
read(STDIN_FILENO, &ch, 1);
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}
115+
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terminal_reset_terminal_mode(&original_term);
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return ch;
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}

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