Simple sscanf mystery

Hello all,
Okay I'm stumped. I must be misreading something, but I think the below program should print "1" as the result of sscanf. That is, I believe searching for "t%c" would catch the character "h" in the below example, but I can't figure out why it always returns 0. :( Any ideas?

Code:

---

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char *argv[], char *envp[])
{
  /* we only care if sscanf found our substring, we don't care what it's value is */
  char *junk;

  junk = (char *) malloc (25);  /* allocate our memory */

  /* why doesn't this return 1? t%c is within "Hello there", should read 'h' */
  printf("\nsscanf returned: %i\n", sscanf("Hello there", "t%c", junk));

  free (junk); /* free up our memory */

  return (0); /* always return success */

} /* end main(...) */

---

I hate just flat-out asking for the answer but it seems I fundamentally misunderstand either the syntax or the sscanf function itself. Thanks for any hints or pointers.

Josh

Code:

---

#include <stdio.h>

int main(void)
{
  char junk;
  /* You may want to tell sscanf to skip the stuff that's not a 't'. */
  printf("\nsscanf returned: %i\n", sscanf("Hello there", "%*[^t]t%c", &junk));
  return (0);

}

/* my output
sscanf returned: 1
*/

---

Thanks! :)

Just one more quick question. Why does junk[2] remain -1 in the below code? Shouldn't junk[2] contain '3456'?

Code:

---

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char *argv[], char *envp[])
{
  int *junk;
  char *data;
  int  i, value;

  data = (char *) malloc (15);
  junk = (int *) malloc (15);

  for (i = 0; i < 15; i++)
  {
      junk[i] = -1;
  }

  strcpy(data, "09+234.88\r\n A151 L+3000 C3456\r\n");

  value = sscanf(data, "%*[^ ] A%i L+%i C%i\r\n", &junk[0], &junk[1], &junk[2]);

  for (i = 0; i < 5; i++)
  {
      printf("\njunk[%i]: %i", i, junk[i]);
  }

  printf("\nvalue: %i\n\n", value);

  free (data);
//  free (junk); SIGSEV :(

  return (0); /* always return success */

} /* end main(...) */

---

My output is:

junk[0]: 151
junk[1]: 3000
junk[2]: -1
junk[3]: -1
junk[4]: -1
value: 2

Quote:

---

data = (char *) malloc (15);
junk = (int *) malloc (15);

---

You are not allocating 15 integers. You are allocating 15 bytes.

Try this on for size:

junk = malloc( sizeof( int ) * 15 );

Quzah.