Enrico Fraccaroli
129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
/// @file edit.c
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/// @brief
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/// @copyright (c) 2014-2023 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include <sys/unistd.h>
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#include <sys/stat.h>
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#include <strerror.h>
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#include <termios.h>
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#include <stdbool.h>
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#include <string.h>
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#include <io/debug.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <fcntl.h>
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#define CTRL_KEY(k) ((k)&0x1f)
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#define BUFFER_SIZE 4096
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static inline void __set_echo(bool_t active)
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{
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struct termios _termios;
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tcgetattr(STDIN_FILENO, &_termios);
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if (active) {
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_termios.c_lflag |= (ICANON | ECHO);
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} else {
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_termios.c_lflag &= ~(ICANON | ECHO);
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}
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tcsetattr(STDIN_FILENO, 0, &_termios);
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}
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int main(int argc, char *argv[])
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{
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if (argc != 2) {
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printf("edit: missing operand.\n");
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printf("Try 'edit --help' for more information.\n\n");
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return 1;
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}
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if (strcmp(argv[1], "--help") == 0) {
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printf("Prints the content of the given file.\n");
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printf("Usage:\n");
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printf(" edit <file>\n\n");
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return 0;
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}
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int fd = open(argv[1], O_RDONLY, 42);
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if (fd < 0) {
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printf("edit: %s: %s\n\n", argv[0], strerror(errno));
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return 1;
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}
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stat_t statbuf;
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if (fstat(fd, &statbuf) == -1) {
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printf("edit: %s: %s\n\n", argv[0], strerror(errno));
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// Close the file descriptor.
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close(fd);
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return 1;
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}
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if (S_ISDIR(statbuf.st_mode)) {
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printf("edit: %s: %s\n\n", argv[0], strerror(EISDIR));
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// Close the file descriptor.
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close(fd);
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return 1;
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}
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// Put on the standard output the characters.
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char buffer[BUFFER_SIZE];
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while (read(fd, buffer, BUFFER_SIZE) > 0) {
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puts(buffer);
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}
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// Close the file descriptor.
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close(fd);
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struct termios _termios;
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tcgetattr(STDIN_FILENO, &_termios);
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_termios.c_lflag &= ~ISIG;
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tcsetattr(STDIN_FILENO, 0, &_termios);
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__set_echo(false);
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do {
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int c = getchar();
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// Return Key
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if (c == '\n') {
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putchar('\n');
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// Break the while loop.
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continue;
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} else if (c == '\033') {
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c = getchar();
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if (c == '[') {
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c = getchar(); // Get the char.
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if ((c == 'A') || (c == 'B')) {
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pr_debug("UP\n");
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} else if (c == 'D') {
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pr_debug("RIGHT\n");
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} else if (c == 'C') {
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pr_debug("LEFT\n");
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} else if (c == 'H') {
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pr_debug("HOME\n");
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} else if (c == 'F') {
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pr_debug("END\n");
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} else if (c == '3') {
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pr_debug("NO-IDEA\n");
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}
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}
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} else if (c == '\b') {
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putchar('\b');
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} else if (c == '\t') {
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pr_debug("TAB\n");
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} else if (c == 127) {
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pr_debug("127\n");
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putchar(127);
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} else if (iscntrl(c)) {
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if (c == CTRL('C')) {
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pr_debug("CTRL(C)\n");
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break;
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} else if (c == CTRL('U')) {
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pr_debug("CTRL(U)\n");
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} else if (c == CTRL('D')) {
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pr_debug("CTRL(D)\n");
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}
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} else if ((c > 0) && (c != '\n')) {
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putchar(c);
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} else {
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pr_debug("Unrecognized character %02x (%c)\n", c, c);
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}
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} while (true);
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__set_echo(true);
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return 0;
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}
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