c - How to read -1 char from stdin? -

i desperate trying figure out how can read char value -1/255 because functions means eof. example if enter characters extended ascii low high (decimal value) end -1/255 eof not array. created small code express problem.

#include <stdio.h> #include <string.h> #include <stdlib.h>  #define buffersize 1024  int main(void){ char c; unsigned int *array = (unsigned int*)calloc(buffersize,sizeof(unsigned int)), = 0; while (1){     c = fgetc(stdin);     if (c == eof)         break;     array[i] = c;     i++; } array[i] = 0; unsigned char *string = (unsigned char *)malloc(i); for(int j = 0;j < i;j++)    string[j] = array[j]; free(array);  //working "string"  return 0; } 

i mode

if (c == eof)    break;  

like this

c = fgetc(stdin); array[i] = c; i++; if (c == eof)    break; 

but ofcourse, program read control character user input keyboard (for example ctrl+d - linux). tried opening stdin binary found out posix systems carries files binary. using qt, gcc , ubuntu. tried fread, read, fgets ended same. said, need read enter on stdin , put char array except when enter control character (ctrl+d) end reading. advices appreciated.

edit: noted in comment @tonyb should not declare c char because fgetc() returns int, changing int c; should make possible store eof in c.

i didn't see declared c char c; credit goes @tonyb.

original answer: although problem addressed in comments, , added solution answer, think confused, eof not character, it's special value returned i/o functions indicate end of stream.

you should never assume it's vaule -1, there macro reason, should rely on fact these functions return eof not -1.

since there no ascii representation value -1 can't input character, can parse input string {'-', '1', '\0'}, , convert number if need to.

also, do not cast return value of malloc().