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Diffstat (limited to 'sh/parser.c')
| -rw-r--r-- | sh/parser.c | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/sh/parser.c b/sh/parser.c deleted file mode 100644 index f1efddc..0000000 --- a/sh/parser.c +++ /dev/null @@ -1,114 +0,0 @@ -/* sh - the standard command language interpreter - * Copyright (C) 2022 Ferass EL HAFIDI - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * 1. Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the copyright holder nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" - * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE - * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN - * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - */ - -#define _POSIX_C_SOURCE 200809L - -/* POSIX Header Files */ -#include <unistd.h> -#include <stdio.h> -#include <string.h> -#include <stdlib.h> -#include <errno.h> -#include <signal.h> - -/* sh Header Files */ -#include "parser.h" -#include "commands.h" - -int parseCommand(int, char **); -int splitCommand(char [4096], char *[4096]); - -/* USAGE - * ----- - * parseCommand(name); - * - * DESCRIPTION - * ----------- - * Parse a shell command and determine if the command to run is built-in or - * external. It then runs the command accordinately. - * <It also could in the future handle tokens.> - */ - -int parseCommand(int argc, char *argv[]) { - struct sigaction signal_action; - int status_code = 0, err = 0; - pid_t isparent; - if (argc == 0) return 0; /* There's no argument. */ - if (!strcmp(argv[0], "cd")) return builtin_cd(argc, argv); - /* The command isn't built-in. */ - isparent = fork(); - wait(&status_code); - if (!isparent) { - /* Do not ignore SIGINT when in a child process. */ - signal_action.sa_handler = SIG_DFL; - sigemptyset(&signal_action.sa_mask); - sigaction(SIGINT, &signal_action, NULL); - /* Some sh implementations manually search for the command in PATH. - * This is not needed here because execvp is going to search for - * that command in PATH anyway. - */ - status_code = execvp(argv[0], argv); - /* If the child process is still alive, we know execvp(3) failed. */ - exit(-errno); - } - /* This code may be used to store the exit value in $?. */ - //if (errno != EINTR && WEXITSTATUS(status_code) !=) return WEXITSTATUS(status_code); - //else return 0; - err = WEXITSTATUS(status_code); - if (err-256 == -E2BIG || err-256 == -EACCES || err-256 == -EINVAL || - err-256 == -ELOOP || - err-256 == -ENAMETOOLONG || err-256 == -ENOENT || err-256 == -ENOTDIR) - printf("sh: %s: %s\n", argv[0], strerror(-(err-256))); - return err; -} - -/* USAGE - * ----- - * splitCommand(name, dest); - * - * DESCRIPTION - * ----------- - * This splits a command string in multiple words. - * The array command can then be ran using execvp(3). It - * also returns an int that can be used as argc. - */ - -int splitCommand(char name[4096], char *splitted_name[4096]) { - long unsigned int array_index = 1; - char *token; - if ((token = strtok(name, " ")) != NULL && token[0] != '#') - splitted_name[0] = token; - else return 0; - /* WARNING: Not thread-safe! */ - for (; (token = strtok(NULL, " ")) != NULL && - token[0] != '#' && - (splitted_name[array_index] = token); array_index++) - /* Do nothing. */ ; - return array_index; -} - |