QueryStrStr.c

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/************************************************************************/
/**

   \file       QueryStrStr.c
   
   \version    V1.21
   \date       07.07.14
   \brief      
   
   \copyright  (c) UCL / Dr. Andrew C. R. Martin 1991-2014
   \author     Dr. Andrew C. R. Martin
   \par
               Institute of Structural & Molecular Biology,
               University College London,
               Gower Street,
               London.
               WC1E 6BT.
   \par
               andrew@bioinf.org.uk
               andrew.martin@ucl.ac.uk
               
**************************************************************************

   This code is NOT IN THE PUBLIC DOMAIN, but it may be copied
   according to the conditions laid out in the accompanying file
   COPYING.DOC.

   The code may be modified as required, but any modifications must be
   documented so that the person responsible can be identified.

   The code may not be sold commercially or included as part of a 
   commercial product except as described in the file COPYING.DOC.

**************************************************************************

   Description:
   ============


**************************************************************************

   Usage:
   ======

**************************************************************************

   Revision History:
   =================
-  V1.1  08.02.91 Added KillLine()
-  V1.2  10.02.91 Added setextn() and index()
-  V1.3  20.03.91 Added Word()
-  V1.4  28.05.92 ANSIed
-  V1.5  22.06.92 Added tab check to Word(). Improved setextn().
                  Added WordN(). Documented other routines.
-  V1.6  27.07.93 Corrected fsscanf() for double precision
-  V1.7  07.10.93 Checks made on case before toupper()/tolower()
                  for SysV compatibility. Also index() becomes
                  chindex()
-  V1.8  18.03.94 getc() -> fgetc()
-  V1.9  11.05.94 Added GetFilestem(), upstrcmp(), upstrncmp() &
                  GetWord()
-  V1.10 24.08.94 Added OpenStdFiles()
-  V1.11 08.03.95 Corrected OpenFile() for non-UNIX
-  V1.12 09.03.95 Added check on non-NULL filename in OpenFile()
-  V1.13 17.07.95 Added countchar()
-  V1.14 18.10.95 Moved YorN() to WindIO.c
-  V1.15 06.11.95 Added StoreString(), InStringList() and FreeStringList()
-  V1.16 22.11.95 Moved ftostr() to generam.c
-  V1.17 15.12.95 Added QueryStrStr()
-  V1.18 18.12.95 OpenStdFiles() treats filename of - as stdin/stdout
-  V1.19 05.02.96 OpenStdFiles() allows NULL pointers instead if filenames
-  V1.20 18.09.96 Added padchar()
-  V1.21 07.07.14 Use bl prefix for functions By: CTP

*************************************************************************/
/* Doxygen
   -------
   #GROUP    General Programming
   #SUBGROUP String handling
   #FUNCTION  blQueryStrStr()
   This is like strstr() but allows a ? character in the substring
   which matches any character.
*/
/************************************************************************/
/* Includes
*/
#include <string.h>

/************************************************************************/
/* Defines and macros
*/

/************************************************************************/
/* Globals
*/

/************************************************************************/
/* Prototypes
*/


/************************************************************************/
/*>char *blQueryStrStr(char *string, char *substring)
   --------------------------------------------------
*//**

   This is like strstr() but allows a ? character in the substring
   which matches any character.

-  15.12.95 Original    By: ACRM
-  07.07.14 Use bl prefix for functions By: CTP
*/
char *blQueryStrStr(char *string, char *substring)
{
   int  i, j, 
        lenstr, 
        lensubstr;
   char *retval = NULL;

   /* Get lengths of the 2 strings                                      */
   lenstr    = strlen(string);
   lensubstr = strlen(substring);
   
   /* Walk through the main string                                      */
   for(i=0; i<=lenstr-lensubstr; i++)
   {
      /* Set return value to point to current position in main string   */
      retval = string + i;
      
      /* Walk through substring                                         */
      for(j=0; j<lensubstr; j++)
      {
         /* If there is a mismatch, set return to NULL and break out of
            the substring counting
         */
         if((substring[j] != '?') && 
            (substring[j] != '%') && 
            (string[i+j] != substring[j]))
         {
            retval = NULL;
            break;
         }
      }

      /* If retval hasn't been set to NULL, then we've got a match, so
         return pointer
      */
      if(retval)
         return(retval);
   }

   /* This should always be NULL...                                     */
   return(retval);
}