> On June 20, 2016 at 10:37 AM Edward Bartolo <edb...@gmail.com> wrote:
>
> On page Page 34 Exercise 1-9
> "Write a program to copy its input to its output, replacing each
> string of blanks one ore more blanks by a single blank."
>
> I wrote the following, tested it, and it seems to work, but I think it is
> too complicated. Any suggestions?
Here's another way to do it:
/*
* K&R exercise
*
* Replace multiple blanks with single blank
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
static
int
filter (void)
{
int ch = getchar (); /* all the logic is here */
if (EOF != ch)
{
putchar (ch);
if (' ' == ch)
for (;;)
{
ch = getchar ();
if (' ' != ch)
{
if (EOF != ch)
putchar (ch);
break;
}
}
}
return ch;
}
static
int
checkError (FILE * fp, const char *arg)
{
if (ferror (fp))
{
const char *pgmName = strrchr (arg, '/');
if (pgmName)
pgmName++; /* get beyond the slash */
else
pgmName = arg;
fprintf (stderr, "%s: I/O error: %s\n", pgmName, strerror (errno));
return 1;
}
return 0;
}
int
main (int argc, char **argv)
{
while (EOF != filter ())
continue; /* this version encodes state in program structure */
if (checkError (stdin, argv[0]))
return 1; /* this version checks for errors */
if (checkError (stdout, argv[0]))
return 1; /* I didn't actually reproduce this error, it is hard
to test */
return 0;
}
I hope this survives line wrapping :-)
Peter Olson
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