c - What's wrong with my code? (Printing File names inside an Archive File) -

i'm trying write program open archive file unix, read files in , print files inside archive , filename. below code -- compiles, got weird output in terminal -- e.g. ?;?u?. should display 2 txt file names. can take @ code , give me guidance on i'm missing? thank you!

edit: made changes code, it's still not working. suggestion or appreciated.

#include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <errno.h> #include <sys/utsname.h> #include <ctype.h> #include <string.h> #include <ar.h>   int main (int argc, char **argv) {     int input_fd;     //char buffer[25];      struct ar_hdr my_ar;      if (argc != 2) {         printf("error", argv[0]);         exit(exit_failure);     }       //open archive file (e.g., hw.a)     input_fd = open(argv[1], o_rdonly);     if (input_fd == -1)     {         perror("can't open input file\n");         exit(-1);     }      while (read(input_fd, my_ar.ar_name, sizeof(buffer)) > 0) {         printf("%s\n", my_ar.ar_name);     }      close(input_fd);      return 0; } 

i don't see anywhere defining my_hdr is, yet printing 1 of supposed members here:

printf("%s\n", my_ar.ar_name); 

you never set ar_name either.

i see read data variable named buffer, never copy buffer ar_name assuming intent.

while (read(input_fd, buffer, sizeof(buffer)) > 0) {     printf("%s\n", my_ar.ar_name); }