111 lines
2.2 KiB
C++
111 lines
2.2 KiB
C++
#include <luna/Vector.h>
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#include <os/ArgumentParser.h>
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#include <errno.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <unistd.h>
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static Result<Vector<char*>> split_command_into_argv(const char* cmd)
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{
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char* str = strdup(cmd);
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Vector<char*> result;
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char* segment = strtok(str, " \n");
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TRY(result.try_append(segment));
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if (segment == NULL) return result;
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for (;;)
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{
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segment = strtok(NULL, " \n");
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TRY(result.try_append(segment));
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if (segment == NULL) return result;
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}
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return result;
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}
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[[noreturn]] static void execute_command(const char* command)
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{
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Vector<char*> argv;
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bool ok = split_command_into_argv(command).try_move_value_or_error(argv, errno);
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if (!ok)
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{
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perror("failed to parse command");
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exit(1);
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}
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if (argv[0] == NULL) exit(0);
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execvp(argv[0], argv.data());
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perror(argv[0]);
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exit(1);
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}
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Result<int> luna_main(int argc, char** argv)
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{
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StringView file;
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StringView command;
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FILE* f;
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os::ArgumentParser parser;
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parser.add_positional_argument(file, "file"_sv, "-"_sv);
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parser.add_value_argument(command, 'c', "command"_sv, true);
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parser.parse(argc, argv);
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if (!command.is_empty()) { execute_command(command.chars()); }
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if (file == "-") f = stdin;
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else
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{
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f = fopen(file.chars(), "r");
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if (!f)
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{
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perror("fopen");
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return 1;
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}
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}
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while (1)
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{
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if (file == "-")
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{
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char* cwd = getcwd(NULL, 0);
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if (!cwd)
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{
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perror("getcwd");
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return 1;
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}
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printf("sh %s%c ", cwd, getuid() == 0 ? '#' : '$');
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free(cwd);
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}
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char cmd[4096];
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char* rc = fgets(cmd, sizeof(cmd), f);
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if (!rc) return 0;
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if (strspn(cmd, " \n") == strlen(cmd)) continue;
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pid_t child = fork();
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if (child < 0)
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{
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perror("fork");
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return 1;
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}
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if (child == 0) { execute_command(cmd); }
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if (waitpid(child, NULL, 0) < 0)
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{
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perror("waitpid");
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return 1;
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}
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}
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}
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