/*
* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* "Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
* Reserved. This file contains Original Code and/or Modifications of
* Original Code as defined in and that are subject to the Apple Public
* Source License Version 1.0 (the 'License'). You may not use this file
* except in compliance with the License. Please obtain a copy of the
* License at http://www.apple.com/publicsource and read it before using
* this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
* License for the specific language governing rights and limitations
* under the License."
*
* @APPLE_LICENSE_HEADER_END@
*/
/* searchp -- search through pathlist for file
*
* Usage: p = searchp (path,file,fullname,func);
* char *p, *path, *file, *fullname;
* int (*func)();
*
* Searchp will parse "path", a list of pathnames separated
* by colons, prepending each pathname to "file". The resulting
* filename will be passed to "func", a function provided by the
* user. This function must return zero if the search is
* successful (i.e. ended), and non-zero if the search must
* continue. If the function returns zero (success), then
* searching stops, the full filename is placed into "fullname",
* and searchp returns 0. If the pathnames are all unsuccessfully
* examined, then searchp returns -1.
* If "file" begins with a slash, it is assumed to be an
* absolute pathname and the "path" list is not used. Note
* that this rule is used by Bell's cc also; whereas Bell's
* sh uses the rule that any filename which CONTAINS a slash
* is assumed to be absolute. The execlp and execvp procedures
* also use this latter rule. In my opinion, this is bogosity.
*
* HISTORY
* 01-Apr-86 Rudy Nedved (ern) at Carnegie-Mellon University
* 4.1BSD system ignores trailing slashes. 4.2BSD does not.
* Therefore don't add a seperating slash if there is a null
* filename.
*
* 23-Oct-82 Steven Shafer (sas) at Carnegie-Mellon University
* Fixed two bugs: (1) calling function as "func" instead of
* "(*func)", (2) omitting trailing null name implied by trailing
* colon in path. Latter bug fixed by introducing "lastchar" and
* changing final loop test to look for "*lastchar" instead of
* "*nextpath".
*
* 20-Nov-79 Steven Shafer (sas) at Carnegie-Mellon University
* Created for VAX. If you're thinking of using this, you probably
* should look at openp() and fopenp() (or the "want..." routines)
* instead.
*
*/
#include "config.h"
int
searchp(const char *spath, char *file, char *fullname, int (*func)(char *))
{
const char *nextpath, *nextchar, *lastchar;
char *fname;
int failure;
nextpath = ((*file == '/') ? "" : spath);
do {
fname = fullname;
nextchar = nextpath;
while (*nextchar && (*nextchar != ':')) {
*fname++ = *nextchar++;
}
if (nextchar != nextpath && *file) {
*fname++ = '/';
}
lastchar = nextchar;
nextpath = ((*nextchar) ? nextchar + 1 : nextchar);
nextchar = file; /* append file */
while (*nextchar) {
*fname++ = *nextchar++;
}
*fname = '\0';
failure = (*func)(fullname);
}while (failure && (*lastchar));
return failure ? -1 : 0;
}