Print file IO error texts

Author: Andreas Stieger

src/main.c

@@ -8,6 +8,7 @@
 #include<stdio.h>
 #include<stdlib.h>
 #include<string.h>
+#include<errno.h>
 #ifndef_WIN32
 #include<libgen.h>
 #endif
@@ -62,7 +63,7 @@ int main(int argc, char** argv)
 fd=fopen(argv[i], "rb");
 if (fd==NULL)
 {
-printf("cannot open file: %s\n", argv[i]);
+fprintf(stderr, "cannot open file: %s: %s\n", argv[i], strerror(errno));
 return1;
  }
 
@@ -75,12 +76,12 @@ int main(int argc, char** argv)
  }
 if (ferror(fd))
 {
-printf("error while reading file: %s\n", argv[i]);
+fprintf(stderr, "error while reading file: %s: %s\n", argv[i], strerror(errno));
 return1;
  }
 if (!feof(fd))
 {
-printf("not end of file?: %s\n",argv[i]);
+fprintf(stderr, "not end of file?: %s: %s\n",argv[i], strerror(errno));
 return1;
  }