str_in.c File Reference

Implementation of the str_in function. More...

#include "mdb.h"
#include <ctype.h>

Go to the source code of this file.

Functions
char *	str_in (char *s, char *t)
	Finds the first occurrence of the substring t in the string s.

Detailed Description

Implementation of the str_in function.

Copyright

• (c) 2002 The University of Chicago, as Operator of Argonne National Laboratory.
• (c) 2002 The Regents of the University of California, as Operator of Los Alamos National Laboratory.

License

This file is distributed under the terms of the Software License Agreement found in the file LICENSE included with this distribution.

Author

M. Borland, C. Saunders, R. Soliday

Definition in file str_in.c.

Function Documentation

str_in()

char * str_in	(	char *	s,
		char *	t )

Finds the first occurrence of the substring t in the string s.

This function searches for the substring t within the string s and returns a pointer to the first occurrence of t. If t is not found, the function returns NULL.

Parameters

s	The string to be searched.
t	The substring to search for within s.

Returns

A pointer to the first occurrence of t in s, or NULL if t is not found.

Definition at line 29 of file str_in.c.

                               {
  register char *ps0, *pt, *ps;
 
  if (s == NULL || t == NULL)
    return (NULL);
 
  ps0 = s;
  while (*ps0) {
    if (*t == *ps0) {
      ps = ps0 + 1;
      pt = t + 1;
      while (*pt && *ps == *pt) {
        pt++;
        ps++;
      }
      if (*pt == 0)
        return (ps0);
    }
    ps0++;
  }
  return (NULL);
}