firefox-main/toolkit/components/backgroundhangmonitor/ChromeScriptPath.h (file symbol)

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_ChromeScriptPath_h
#define mozilla_ChromeScriptPath_h
#include <stddef.h>
#include <string.h>
namespace mozilla {
namespace detail {
// Get the full path after the URI scheme, if the URI matches the scheme.
// For example, GetFullPathForScheme("a://b/c/d/e", "a://") returns "b/c/d/e".
template <size_t LEN>
const char* GetFullPathForScheme(const char* filename,
const char (&scheme)[LEN]) {
// Account for the null terminator included in LEN.
if (!strncmp(filename, scheme, LEN - 1)) {
return filename + LEN - 1;
}
return nullptr;
}
// Get the full path after a URI component, if the URI contains the component.
// For example, GetPathAfterComponent("a://b/c/d/e", "/c/") returns "d/e".
template <size_t LEN>
const char* GetPathAfterComponent(const char* filename,
const char (&component)[LEN]) {
const char* found = nullptr;
const char* next = strstr(filename, component);
while (next) {
// Move 'found' to end of the component, after the separator '/'.
// 'LEN - 1' accounts for the null terminator included in LEN,
found = next + LEN - 1;
// Resume searching before the separator '/'.
next = strstr(found - 1, component);
}
return found;
}
} // namespace detail
// Returns the part of a system principal script's filename that background
// hang reports may contain, pointing into aFilename. The OmnijarCanaryFailure
// crash annotation reuses this filter. Must stay async-signal-safe.
inline const char* GetReportableChromeScriptPath(const char* aFilename) {
// Some script names are in the form "foo -> bar -> baz".
// Here we find the origin of these redirected scripts.
if (const char* origin = detail::GetPathAfterComponent(aFilename, " -> ")) {
aFilename = origin;
}
const char* path = detail::GetFullPathForScheme(aFilename, "chrome://");
if (!path) {
path = detail::GetFullPathForScheme(aFilename, "resource://");
}
if (!path) {
path = detail::GetFullPathForScheme(aFilename, "moz-src:///");
}
if (!path) {
// If we're in an add-on script, under the {profile}/extensions
// directory, extract the path after the /extensions/ part.
path = detail::GetPathAfterComponent(aFilename, "/extensions/");
}
if (!path) {
// Only keep the file base name for paths outside the above formats.
path = strrchr(aFilename, '/');
path = path ? path + 1 : aFilename;
// Look for Windows path separator as well.
if (const char* leaf = strrchr(path, '\\')) {
path = leaf + 1;
}
}
return path;
}
} // namespace mozilla
#endif // mozilla_ChromeScriptPath_h