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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
#include "google_breakpad/processor/proc_maps_linux.h"
#include <fcntl.h>
#include <inttypes.h>
#include <stdio.h>
#include "common/using_std_string.h"
#include "processor/logging.h"
#if defined(ANDROID) && !defined(__LP64__)
// In 32-bit mode, Bionic's inttypes.h defines PRI/SCNxPTR as an
// unsigned long int, which is incompatible with Bionic's stdint.h
// defining uintptr_t as an unsigned int:
#undef SCNxPTR
#define SCNxPTR "x"
#endif
namespace google_breakpad {
bool ParseProcMaps(const string& input,
std::vector<MappedMemoryRegion>* regions_out) {
std::vector<MappedMemoryRegion> regions;
// This isn't async safe nor terribly efficient, but it doesn't need to be at
// this point in time.
// Split the string by newlines.
std::vector<string> lines;
string l = "";
for (size_t i = 0; i < input.size(); i++) {
if (input[i] != '\n' && input[i] != '\r') {
l.push_back(input[i]);
} else if (l.size() > 0) {
lines.push_back(l);
l.clear();
}
}
if (l.size() > 0) {
BPLOG(ERROR) << "Input doesn't end in newline";
return false;
}
for (size_t i = 0; i < lines.size(); ++i) {
MappedMemoryRegion region;
const char* line = lines[i].c_str();
char permissions[5] = {'\0'}; // Ensure NUL-terminated string.
int path_index = 0;
// Sample format from man 5 proc:
//
// address perms offset dev inode pathname
// 08048000-08056000 r-xp 00000000 03:0c 64593 /usr/sbin/gpm
//
// The final %n term captures the offset in the input string, which is used
// to determine the path name. It *does not* increment the return value.
// Refer to man 3 sscanf for details.
if (sscanf(line, "%" SCNx64 "-%" SCNx64 " %4c %" SCNx64" %hhx:%hhx %"
SCNd64 " %n", ®ion.start, ®ion.end, permissions,
®ion.offset, ®ion.major_device, ®ion.minor_device,
®ion.inode, &path_index) < 7) {
BPLOG(ERROR) << "sscanf failed for line: " << line;
return false;
}
region.permissions = 0;
if (permissions[0] == 'r')
region.permissions |= MappedMemoryRegion::READ;
else if (permissions[0] != '-')
return false;
if (permissions[1] == 'w')
region.permissions |= MappedMemoryRegion::WRITE;
else if (permissions[1] != '-')
return false;
if (permissions[2] == 'x')
region.permissions |= MappedMemoryRegion::EXECUTE;
else if (permissions[2] != '-')
return false;
if (permissions[3] == 'p')
region.permissions |= MappedMemoryRegion::PRIVATE;
else if (permissions[3] != 's' && permissions[3] != 'S') // Shared memory.
return false;
// Pushing then assigning saves us a string copy.
regions.push_back(region);
regions.back().path.assign(line + path_index);
regions.back().line.assign(line);
}
regions_out->swap(regions);
return true;
}
} // namespace google_breakpad