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part2.c
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part2.c
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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
int main(int argc, char** argv, char** envp){
if (argc <= 1) {
printf("NO FILE PROVIDED\n");
return 0;
}
if (access(*(argv+1), F_OK) != 0){
printf("FILE DOES NOT EXIST\n");
return 0;
}
pid_t pid;
FILE * fp;
char buf[255];
char* args[3];
char* fibonacci = malloc(10 * sizeof(char));
args[2] = NULL;
args[1] = argv[1];
while(1){
printf("Which application would you like to run? (solver, trace, fib, quit, change): ");
char temp[255] = "./";
scanf(" %s", buf);
if (strcmp(buf, "quit") == 0)
return 0;
if (strcmp(buf, "change") == 0){
printf("Enter the new file name: ");
scanf(" %s", argv[1]);
args[1] = argv[1];
}
else{
if (strcmp(buf, "fib") == 0){
fp = fopen(argv[1], "r");
fscanf(fp, "%s", fibonacci);
args[1] = fibonacci;
fclose(fp);
}
args[0] = strcat(temp, buf);
if ((pid = fork()) == 0){
execve(args[0], args, envp);
exit(0);
}
else
waitpid(pid, NULL, 0);
wait(NULL);
}
}
free(fibonacci);
return 0;
}