str_inn.c File Reference

Detailed Description

Contains string str_inn 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_inn.c.

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

Go to the source code of this file.

Functions
char *	str_inn (char *s, char *t, long n)
	Searches for the first occurrence of substring t within the first n characters of string s.

Function Documentation

str_inn()

char * str_inn	(	char *	s,
		char *	t,
		long	n )

Searches for the first occurrence of substring t within the first n characters of string s.

This function scans the string s to find the substring t. It only considers the first n characters of s. If t is found within these bounds, a pointer to the beginning of t in s is returned.

Parameters

s	The string to be searched.
t	The substring to locate within s.
n	The maximum number of characters in s to be searched.

Returns

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

Definition at line 30 of file str_inn.c.

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