git.sur5r.net Git - cc65/blob - src/common/fileid.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                 fileid.c                                  */
   4 /*                                                                           */
   5 /*               Determine the id of a file type by extension                */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2003-2012, Ullrich von Bassewitz                                      */
  10 /*                Roemerstrasse 52                                           */
  11 /*                D-70794 Filderstadt                                        */
  12 /* EMail:         uz@cc65.org                                                */
  13 /*                                                                           */
  14 /*                                                                           */
  15 /* This software is provided 'as-is', without any expressed or implied       */
  16 /* warranty.  In no event will the authors be held liable for any damages    */
  17 /* arising from the use of this software.                                    */
  18 /*                                                                           */
  19 /* Permission is granted to anyone to use this software for any purpose,     */
  20 /* including commercial applications, and to alter it and redistribute it    */
  21 /* freely, subject to the following restrictions:                            */
  22 /*                                                                           */
  23 /* 1. The origin of this software must not be misrepresented; you must not   */
  24 /*    claim that you wrote the original software. If you use this software   */
  25 /*    in a product, an acknowledgment in the product documentation would be  */
  26 /*    appreciated but is not required.                                       */
  27 /* 2. Altered source versions must be plainly marked as such, and must not   */
  28 /*    be misrepresented as being the original software.                      */
  29 /* 3. This notice may not be removed or altered from any source              */
  30 /*    distribution.                                                          */
  31 /*                                                                           */
  32 /*****************************************************************************/
  33
  34
  35
  36 #include <stdlib.h>
  37 #include <string.h>
  38
  39 /* common */
  40 #include "fileid.h"
  41 #include "fname.h"
  42
  43
  44
  45 /*****************************************************************************/
  46 /*                                   Code                                    */
  47 /*****************************************************************************/
  48
  49
  50
  51 int CompareFileId (const void* Key, const void* Id)
  52 /* Compare function used when calling bsearch with a table of FileIds */
  53 {
  54     return strcmp (Key, ((const FileId*) Id)->Ext);
  55 }
  56
  57
  58
  59 const FileId* GetFileId (const char* Name, const FileId* Table, unsigned Count)
  60 /* Determine the id of the given file by looking at file extension of the name.
  61 ** The table passed to the function must be sorted alphabetically. If the
  62 ** extension is found, a pointer to the matching table entry is returned. If
  63 ** no matching table entry was found, the function returns NULL.
  64 */
  65 {
  66     /* Determine the file type by the extension */
  67     const char* Ext = FindExt (Name);
  68
  69     /* Do we have an extension? */
  70     if (Ext == 0) {
  71         return 0;
  72     }
  73
  74     /* Search for a table entry and return it */
  75     return bsearch (Ext+1, Table, Count, sizeof (FileId), CompareFileId);
  76 }