diff options
Diffstat (limited to 'ed.c')
| -rw-r--r-- | ed.c | 147 |
1 files changed, 147 insertions, 0 deletions
@@ -0,0 +1,147 @@ +/* SPDX-License-Identifier: BSD-3-Clause */ +/* + * Copyright (C) 2022, 2023 Ferass El Hafidi <vitali64pmemail@protonmail.com> + */ +#include <stdio.h> +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> +#include <signal.h> +#include <string.h> + +#define REQ_PRINT_USAGE /* Require print_usage() from common.h */ +#define REQ_ERRPRINT /* Require errprint() from common.h */ +#define DESCRIPTION "Edit text." +#define OPERANDS "[-p prompt]" +#include "common.h" + +void print_error(const char *error, int help_mode); +size_t c_append(char buffer[4096]); + +#ifdef FASESBOX +int ed_main(int argc, char *argv[]) { +#else +int main(int argc, char *argv[]) { +#endif + int argument, i = 0, fildes = -1; + char buffer[4096], *edit_pathname, *prompt_string = "", + command_string[4096], *error = "", *argv0 = strdup(argv[0]); + int help_mode = 0; + struct sigaction signal_action; + + while ((argument = getopt(argc, argv, "p:")) != -1) { + if (argument == '?') { + print_usage(argv[0], DESCRIPTION, OPERANDS, VERSION); + return 1; + } + else if (argument == 'p') + prompt_string = optarg; + } + argc -= optind; + argv += optind; + + signal_action.sa_handler = SIG_IGN; + sigemptyset(&signal_action.sa_mask); + sigaction(SIGINT, &signal_action, NULL); + + setvbuf(stdout, NULL, _IONBF, 0); + for (;;) { + write(STDOUT_FILENO, prompt_string, strlen(prompt_string)); + //if (fgets(command_string, 4096, stdin) == NULL) return errno; + if (read(STDIN_FILENO, command_string, 4096) == -1) + return errprint(argv0, "read <stdin>", errno); + switch (command_string[i]) { /* Addresses */ + case '.': + case '$': + case '\'': + case '+': + case '-': + /* FALLTHROUGH */ + ++i; + print_error((error = "not implemented"), help_mode); + continue; + } + switch (command_string[i]) { /* Commands */ + case 'e': /* Edit Command */ + if (i < 0) { + print_error((error = "unexpected address"), help_mode); + continue; + } + if (strlen(command_string) > 2 && i == 0) { + edit_pathname = command_string + 2; + edit_pathname[strlen(edit_pathname) - 1] = '\0'; + } else if (!edit_pathname) { + print_error((error = "no pathname given"), help_mode); + continue; + } + fildes = open(edit_pathname, O_RDONLY | O_CREAT); + if (errno) return errprint(argv0, "open()", errno); + printf("%ld\n", read(fildes, buffer, 4096)); + if (fildes != -1) close(fildes); + continue; + case 'a': + c_append(buffer); + continue; + case 'w': + if (strtok(command_string, " ") != NULL && strtok(NULL, " ") != NULL + && i == 0) { + edit_pathname = command_string + 2; + edit_pathname[strlen(edit_pathname) - 1] = '\0'; + fildes = open(edit_pathname, O_RDWR | O_CREAT); + } else if (edit_pathname) { + fildes = open(edit_pathname, O_RDWR); + } else { + if (i != 0) + print_error((error = "unexpected address"), help_mode); + else + print_error((error = "no pathname given"), help_mode); + continue; + } + if (errno) return errprint(argv0, "open()", errno); + printf("%ld\n", write(fildes, buffer, strlen(buffer))); + if (errno) return errprint(argv0, "write()", errno); + if (fildes != -1) close(fildes); + continue; + case 'q': + if (fildes != -1) close(fildes); + return errprint(argv0, NULL, errno); + case 'H': /* Help mode */ + if (i < 0) { + print_error((error = "unexpected address"), help_mode); + continue; + } + /* If help_mode was equal to 1, set it to 0 and vice-versa. */ + help_mode = !help_mode; + /* FALLTHROUGH */ + case 'h': /* Help Command */ + /* FALLTHROUGH */ + print_error(error, help_mode + 2); /* Print the last encountered error. */ + continue; + default: /* Invalid/Not implemented command */ + print_error((error = "invalid or not implemented"), help_mode); + } + } +} + +size_t c_append(char buffer[4096]) { + char *tempbuf = NULL; + size_t bufsize = 0, bytes_read = 0; + + while ((bytes_read += getline(&tempbuf, &bufsize, stdin)) > 0) { + if (!strcmp(tempbuf, ".\n")) break; + strcat(buffer, tempbuf); + } + return bytes_read; +} + +void printUsage(void) { + printf("Ferass' Base System. (%s)\n\n" + "Usage: ed [-p prompt_string]\n\n" + "Edit text.\n\n" + "\t-p prompt_string\tAppend a prompt string.\n", VERSION); +} + +void print_error(const char *error, int help_mode) { + if (help_mode <= 1) puts("?"); + if (help_mode) puts(error); +} |