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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#include <fcntl.h>
#include "builtin.h"
size_t getargs(const size_t n, char *args[n], FILE * const stream);
int shellexec(size_t n, char * const args[n]);
/* int shellredirect(size_t n, char * const args[n], const char * const file, const int mode); */
/* int shelltofile(size_t n, char * const args[n], const int fd); */
static bool run = true;
static const char * const delim = "\t\n &|><";
int main(int argc, char *argv[]) {
char *words[BUFSIZ] = {NULL};
FILE *fp = stdin;
size_t numberofwords = 0;
if (argc == 2) {
if ((fp = fopen(argv[1], "r")) == NULL) {
perror("jsh");
return EXIT_FAILURE;
}
}
while (run) {
printf("$ ");
numberofwords = getargs(BUFSIZ, words, fp);
shellexec(numberofwords, words);
for (int i = 0; i < numberofwords; i++) {
free(words[i]);
words[i] = NULL;
}
}
return 0;
}
size_t getargs(const size_t n, char *args[n], FILE * const stream) {
char *line = (char *)malloc(BUFSIZ), *tofree, *token;
size_t linecap = 0, num = 0;
getline(&line, &linecap, stream);
tofree = line;
while ((token = strsep(&line, delim)) != NULL) {
if (strcmp(token, "") != 0) {
args[num++] = strdup(token);
}
}
free((void *)tofree);
return num;
}
int shellexec(const size_t n, char * const args[n]) {
int index;
if (strcmp(args[0], "exit") == 0) {
run = false;
return EXIT_SUCCESS;
} else if ((index = checkbuiltin(args[0])) != -1) {
return execbuiltin(index, n, args);
}
pid_t pid = fork();
int status;
if (pid == 0) {
if (execvp(args[0], args) == -1) {
perror("jsh");
}
exit(EXIT_FAILURE);
} else if (pid < 0) {
perror("jsh");
exit(EXIT_FAILURE);
} else {
do {
waitpid(pid, &status, WUNTRACED);
} while (!WIFEXITED(status) && !WIFSIGNALED(status));
}
return EXIT_SUCCESS;
}
/* int shellredirect(size_t n, char * const args[n], const char * const file, const int mode) { */
/* int fd = open(file, mode); */
/* int status; */
/* if (mode & O_WRONLY || mode & O_APPEND) { */
/* status = shelltofile(n, args, fd); */
/* } else if (mode & O_RDONLY) { */
/* status = EXIT_FAILURE; */
/* } else { */
/* status = EXIT_FAILURE; */
/* } */
/* close(fd); */
/* return status; */
/* } */
/* int shelltofile(size_t n, char * const args[n], const int fd) { */
/* pid_t pid = fork(); */
/* int status; */
/* if (pid == 0) { */
/* close(STDOUT_FILENO); */
/* dup2(fd, STDOUT_FILENO); */
/* if (execvp(args[0], args) == -1) { */
/* perror("jsh"); */
/* exit(EXIT_FAILURE); */
/* } */
/* exit(EXIT_SUCCESS); */
/* } else if (pid < 0) { */
/* perror("jsh"); */
/* exit(EXIT_FAILURE); */
/* } else { */
/* do { */
/* waitpid(pid, &status, WUNTRACED); */
/* } while (!WIFEXITED(status) && !WIFSIGNALED(status)); */
/* } */
/* return EXIT_SUCCESS; */
/* } */
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