Search name in file

[Noizz]

Hi

The file is called: user.txt and has the following data in it:

bart|blabla|0|0
jeroen|gvrs|0|0
ann|cls|0|0
peter|clssns|0|0

I want users to be able to add a username & pass to this file, but how do I search in this file for existing names?

So: if somebody types: "bart", C should return an error

I just need the function to search for this name.

Thx in advance
Noizz

 

[marsd]

man strstr.

 

[Noizz]

How do you put this textfile in an array so we can easily find names and adjust the data in the textfile?

greetz

 

[ArkM]

See fopen, fgets/fread, fclose (plus fseek/ftell, malloc.
It depends on what do you want to do with search result...

 

[marsd]

Wouldn't use an array, but if I had to..

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




char **aResize (int, char **);
void prArray (char **, int);

int
main (void)
{
  int i = 0;
  char **arr;

  while (i < 10)
    {
      if ((arr = aResize ((i * 10), arr)) != NULL)
	{
	  prArray (arr, (i * 10));
	}
      ++i;
    }
  return 0;
}

char **
aResize (int nm, char **aa)
{
  int p;
  if (aa == NULL)
    {
      aa = malloc (nm * sizeof (char *));
      if (aa)
	{
	  for (p = ((nm - 10) >= 0 ? (nm - 10) : 0); p < nm; p++)
	    {
	      aa[p] = malloc (10 * sizeof (char));
	      if (!aa[p])
		{
		  perror ("malloc()");
		  exit (1);
		}
	      strcpy (aa[p], "!!foo!!");
	    }
	  return aa;
	}
      return NULL;
    }
  else
    {
      /*existing array */
      aa = realloc (aa, nm * sizeof (char *));
      if (aa)
	{
	  for (p = ((nm - 10) >= 0 ? (nm - 10) : 0); p < nm; p++)
	    {
	      aa[p] = malloc (10 * sizeof (char));
	      if (!aa[p])
		{
		  perror ("malloc()");
		  exit (1);
		}
	      strcpy (aa[p], "!!foo!!");
	    }
	  return aa;
	}
      return NULL;
    }
}

void
prArray (char **foo, int ne)
{
  int y = 0;

  printf ("Head pointer at: %p\n", foo);
  while (y < ne)
    {
      printf ("Pointer: %d at: %p = %s\n", y, &foo[y], foo[y]);
      y++;
    }
}

HTH