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/*--------------------------------------------------------------------*/
/*--- search PATH for an executable m_pathscan.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2000-2017 Julian Seward
jseward@acm.org
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
The GNU General Public License is contained in the file COPYING.
*/
#include "pub_core_basics.h"
#include "pub_core_libcbase.h"
#include "pub_core_libcassert.h"
#include "pub_core_libcfile.h"
#include "pub_core_libcproc.h"
#include "pub_core_libcprint.h"
#include "pub_core_mallocfree.h"
#include "pub_core_pathscan.h" /* self */
/*====================================================================*/
/*=== Find executable ===*/
/*====================================================================*/
/* Scan a colon-separated list, and call a function on each element.
The string must be mutable, because we insert a temporary '\0', but
the string will end up unmodified. (*func) should return True if it
doesn't need to see any more.
This routine will return True if (*func) returns True and False if
it reaches the end of the list without that happening.
*/
static Bool scan_colsep(HChar *colsep, Bool (*func)(const HChar *))
{
HChar *cp, *entry;
int end;
if (colsep == NULL ||
*colsep == '\0')
return False;
entry = cp = colsep;
do {
end = (*cp == '\0');
if (*cp == ':' || *cp == '\0') {
HChar save = *cp;
*cp = '\0';
if ((*func)(entry)) {
*cp = save;
return True;
}
*cp = save;
entry = cp+1;
}
cp++;
} while(!end);
return False;
}
static const HChar *executable_name_in;
static HChar *executable_name_out;
static Bool match_executable(const HChar *entry)
{
/* empty ENTRY element means '.' */
if (*entry == '\0')
entry = ".";
HChar buf[VG_(strlen)(entry) + 1 + VG_(strlen)(executable_name_in) + 1];
VG_(sprintf)(buf, "%s/%s", entry, executable_name_in);
// Don't match directories
if (VG_(is_dir)(buf))
return False;
// If we match an executable, we choose that immediately. If we find a
// matching non-executable we remember it but keep looking for an
// matching executable later in the path.
if (VG_(access)(buf, True/*r*/, False/*w*/, True/*x*/) == 0) {
VG_(free)(executable_name_out);
executable_name_out = VG_(strdup)("match_executable", buf);
return True; // Stop looking
} else if (VG_(access)(buf, True/*r*/, False/*w*/, False/*x*/) == 0
&& executable_name_out == NULL)
{
executable_name_out = VG_(strdup)("match_executable", buf);
return False; // Keep looking
} else {
return False; // Keep looking
}
}
// Returns NULL if it wasn't found.
const HChar* VG_(find_executable) ( const HChar* exec )
{
vg_assert(NULL != exec);
if (VG_(strchr)(exec, '/')) {
// Has a '/' - use the name as is even if exec is a directory.
// The reason is that we get a better error message this way:
// valgrind ./foo
// valgrind: ./foo: is a directory
return exec;
}
// No '/' - we need to search the path
HChar* path = VG_(getenv)("PATH");
VG_(free)(executable_name_out);
executable_name_in = exec;
executable_name_out = NULL;
scan_colsep(path, match_executable);
return executable_name_out;
}
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/
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