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/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; -*- */
// SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
// SPDX-FileCopyrightText: 2008 litl, LLC
#include <config.h>
#include <charconv>
#include <string>
#include <string_view>
#include <system_error>
#include <glib.h>
#include <mozilla/Result.h>
#include "util/misc.h"
using mozilla::Err;
bool gjs_environment_variable_is_set(const char* env_variable_name) {
const char* s = g_getenv(env_variable_name);
if (!s)
return false;
if (*s == '\0')
return false;
return true;
}
/**
* gjs_g_strv_concat:
*
* Concate an array of string arrays to one string array. The strings in each
* array is copied to the resulting array.
*
* @strv_array: array of 0-terminated arrays of strings. Null elements are
* allowed.
* @len: number of arrays in @strv_array
*
* Returns: (transfer full): a newly allocated 0-terminated array of strings.
*/
char** gjs_g_strv_concat(const char** strv_array[], int len) {
GPtrArray* array = g_ptr_array_sized_new(16);
for (int i = 0; i < len; i++) {
const char** strv = strv_array[i];
if (!strv)
continue;
for (int j = 0; strv[j]; ++j)
g_ptr_array_add(array, g_strdup(strv[j]));
}
g_ptr_array_add(array, nullptr);
return reinterpret_cast<char**>(g_ptr_array_free(array, false));
}
namespace Gjs {
StatmParseResult parse_statm_file_rss(const char* file_contents) {
auto npos = std::string_view::npos;
// See "man proc_pid_statm"; RSS is the 2nd space-separated field, after
// SIZE, which we skip.
std::string_view view{file_contents};
size_t space_index = view.find(' ');
if (space_index == npos)
return Err("Unexpected missing RSS field in /proc/self/statm");
view.remove_prefix(space_index + 1);
uint64_t rss_size;
auto result =
std::from_chars(view.data(), view.data() + view.size(), rss_size);
if (result.ec != std::errc{}) { // COMPAT: operator bool in c++26
return Err(StatmParseError{
"Error reading RSS field in /proc/self/statm", result});
}
if (*result.ptr != ' ' && *result.ptr != '\0')
return Err("Badly formatted RSS field in /proc/self/statm");
return rss_size;
}
StatmParseError::StatmParseError(const char* message,
std::from_chars_result result) {
// COMPAT: operator bool in c++26
g_assert(result.ec != std::errc() && "result should not be successful");
std::error_code code = std::make_error_code(result.ec);
m_message = std::string(message) + ": " + code.message() +
" (remaining string '" + result.ptr + "')";
}
} // namespace Gjs
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