--- /dev/null
+// (‑●‑●)> dual licensed under the WTFPL v2 and MIT licenses
+// without any warranty.
+// by Gregory Pakosz (@gpakosz)
+// https://github.com/gpakosz/whereami
+
+// in case you want to #include "whereami.c" in a larger compilation unit
+#if !defined(WHEREAMI_H)
+#include <whereami.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if !defined(WAI_MALLOC) || !defined(WAI_FREE) || !defined(WAI_REALLOC)
+#include <stdlib.h>
+#endif
+
+#if !defined(WAI_MALLOC)
+#define WAI_MALLOC(size) malloc(size)
+#endif
+
+#if !defined(WAI_FREE)
+#define WAI_FREE(p) free(p)
+#endif
+
+#if !defined(WAI_REALLOC)
+#define WAI_REALLOC(p, size) realloc(p, size)
+#endif
+
+#ifndef WAI_NOINLINE
+#if defined(_MSC_VER)
+#define WAI_NOINLINE __declspec(noinline)
+#elif defined(__GNUC__)
+#define WAI_NOINLINE __attribute__((noinline))
+#else
+#error unsupported compiler
+#endif
+#endif
+
+#if defined(_MSC_VER)
+#define WAI_RETURN_ADDRESS() _ReturnAddress()
+#elif defined(__GNUC__)
+#define WAI_RETURN_ADDRESS() __builtin_extract_return_addr(__builtin_return_address(0))
+#else
+#error unsupported compiler
+#endif
+
+#if defined(_WIN32)
+
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#if defined(_MSC_VER)
+#pragma warning(push, 3)
+#endif
+#include <windows.h>
+#include <intrin.h>
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#endif
+
+static int WAI_PREFIX(getModulePath_)(HMODULE module, char* out, int capacity, int* dirname_length)
+{
+ wchar_t buffer1[MAX_PATH];
+ wchar_t buffer2[MAX_PATH];
+ wchar_t* path = NULL;
+ int length = -1;
+
+ for (;;)
+ {
+ DWORD size;
+ int length_, length__;
+
+ size = GetModuleFileNameW(module, buffer1, sizeof(buffer1) / sizeof(buffer1[0]));
+
+ if (size == 0)
+ break;
+ else if (size == (DWORD)(sizeof(buffer1) / sizeof(buffer1[0])))
+ {
+ DWORD size_ = size;
+ do
+ {
+ wchar_t* path_;
+
+ path_ = (wchar_t*)WAI_REALLOC(path, sizeof(wchar_t) * size_ * 2);
+ if (!path_)
+ break;
+ size_ *= 2;
+ path = path_;
+ size = GetModuleFileNameW(module, path, size_);
+ }
+ while (size == size_);
+
+ if (size == size_)
+ break;
+ }
+ else
+ path = buffer1;
+
+ if (!_wfullpath(buffer2, path, MAX_PATH))
+ break;
+ length_ = (int)wcslen(buffer2);
+ length__ = WideCharToMultiByte(CP_UTF8, 0, buffer2, length_ , out, capacity, NULL, NULL);
+
+ if (length__ == 0)
+ length__ = WideCharToMultiByte(CP_UTF8, 0, buffer2, length_, NULL, 0, NULL, NULL);
+ if (length__ == 0)
+ break;
+
+ if (length__ <= capacity && dirname_length)
+ {
+ int i;
+
+ for (i = length__ - 1; i >= 0; --i)
+ {
+ if (out[i] == '\\')
+ {
+ *dirname_length = i;
+ break;
+ }
+ }
+ }
+
+ length = length__;
+
+ break;
+ }
+
+ if (path != buffer1)
+ WAI_FREE(path);
+
+ return length;
+}
+
+WAI_NOINLINE WAI_FUNCSPEC
+int WAI_PREFIX(getExecutablePath)(char* out, int capacity, int* dirname_length)
+{
+ return WAI_PREFIX(getModulePath_)(NULL, out, capacity, dirname_length);
+}
+
+WAI_NOINLINE WAI_FUNCSPEC
+int WAI_PREFIX(getModulePath)(char* out, int capacity, int* dirname_length)
+{
+ HMODULE module;
+ int length = -1;
+
+#if defined(_MSC_VER)
+#pragma warning(push)
+#pragma warning(disable: 4054)
+#endif
+ if (GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT, (LPCTSTR)WAI_RETURN_ADDRESS(), &module))
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#endif
+ {
+ length = WAI_PREFIX(getModulePath_)(module, out, capacity, dirname_length);
+ }
+
+ return length;
+}
+
+#elif defined(__linux__) || defined(__CYGWIN__) || defined(__sun) || defined(WAI_USE_PROC_SELF_EXE)
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#if defined(__linux__)
+#include <linux/limits.h>
+#else
+#include <limits.h>
+#endif
+#ifndef __STDC_FORMAT_MACROS
+#define __STDC_FORMAT_MACROS
+#endif
+#include <inttypes.h>
+
+#if !defined(WAI_PROC_SELF_EXE)
+#if defined(__sun)
+#define WAI_PROC_SELF_EXE "/proc/self/path/a.out"
+#else
+#define WAI_PROC_SELF_EXE "/proc/self/exe"
+#endif
+#endif
+
+WAI_FUNCSPEC
+int WAI_PREFIX(getExecutablePath)(char* out, int capacity, int* dirname_length)
+{
+ char buffer[PATH_MAX];
+ char* resolved = NULL;
+ int length = -1;
+
+ for (;;)
+ {
+ resolved = realpath(WAI_PROC_SELF_EXE, buffer);
+ if (!resolved)
+ break;
+
+ length = (int)strlen(resolved);
+ if (length <= capacity)
+ {
+ memcpy(out, resolved, length);
+
+ if (dirname_length)
+ {
+ int i;
+
+ for (i = length - 1; i >= 0; --i)
+ {
+ if (out[i] == '/')
+ {
+ *dirname_length = i;
+ break;
+ }
+ }
+ }
+ }
+
+ break;
+ }
+
+ return length;
+}
+
+#if !defined(WAI_PROC_SELF_MAPS_RETRY)
+#define WAI_PROC_SELF_MAPS_RETRY 5
+#endif
+
+#if !defined(WAI_PROC_SELF_MAPS)
+#if defined(__sun)
+#define WAI_PROC_SELF_MAPS "/proc/self/map"
+#else
+#define WAI_PROC_SELF_MAPS "/proc/self/maps"
+#endif
+#endif
+
+#if defined(__ANDROID__) || defined(ANDROID)
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#endif
+
+WAI_NOINLINE WAI_FUNCSPEC
+int WAI_PREFIX(getModulePath)(char* out, int capacity, int* dirname_length)
+{
+ int length = -1;
+ FILE* maps = NULL;
+
+ for (int r = 0; r < WAI_PROC_SELF_MAPS_RETRY; ++r)
+ {
+ maps = fopen(WAI_PROC_SELF_MAPS, "r");
+ if (!maps)
+ break;
+
+ for (;;)
+ {
+ char buffer[PATH_MAX < 1024 ? 1024 : PATH_MAX];
+ uint64_t low, high;
+ char perms[5];
+ uint64_t offset;
+ uint32_t major, minor;
+ char path[PATH_MAX];
+ uint32_t inode;
+
+ if (!fgets(buffer, sizeof(buffer), maps))
+ break;
+
+ if (sscanf(buffer, "%" PRIx64 "-%" PRIx64 " %s %" PRIx64 " %x:%x %u %s\n", &low, &high, perms, &offset, &major, &minor, &inode, path) == 8)
+ {
+ uint64_t addr = (uintptr_t)WAI_RETURN_ADDRESS();
+ if (low <= addr && addr <= high)
+ {
+ char* resolved;
+
+ resolved = realpath(path, buffer);
+ if (!resolved)
+ break;
+
+ length = (int)strlen(resolved);
+#if defined(__ANDROID__) || defined(ANDROID)
+ if (length > 4
+ &&buffer[length - 1] == 'k'
+ &&buffer[length - 2] == 'p'
+ &&buffer[length - 3] == 'a'
+ &&buffer[length - 4] == '.')
+ {
+ int fd = open(path, O_RDONLY);
+ if (fd == -1)
+ {
+ length = -1; // retry
+ break;
+ }
+
+ char* begin = (char*)mmap(0, offset, PROT_READ, MAP_SHARED, fd, 0);
+ if (begin == MAP_FAILED)
+ {
+ close(fd);
+ length = -1; // retry
+ break;
+ }
+
+ char* p = begin + offset - 30; // minimum size of local file header
+ while (p >= begin) // scan backwards
+ {
+ if (*((uint32_t*)p) == 0x04034b50UL) // local file header signature found
+ {
+ uint16_t length_ = *((uint16_t*)(p + 26));
+
+ if (length + 2 + length_ < (int)sizeof(buffer))
+ {
+ memcpy(&buffer[length], "!/", 2);
+ memcpy(&buffer[length + 2], p + 30, length_);
+ length += 2 + length_;
+ }
+
+ break;
+ }
+
+ --p;
+ }
+
+ munmap(begin, offset);
+ close(fd);
+ }
+#endif
+ if (length <= capacity)
+ {
+ memcpy(out, resolved, length);
+
+ if (dirname_length)
+ {
+ int i;
+
+ for (i = length - 1; i >= 0; --i)
+ {
+ if (out[i] == '/')
+ {
+ *dirname_length = i;
+ break;
+ }
+ }
+ }
+ }
+
+ break;
+ }
+ }
+ }
+
+ fclose(maps);
+ maps = NULL;
+
+ if (length != -1)
+ break;
+ }
+
+ if (maps)
+ fclose(maps);
+
+ return length;
+}
+
+#elif defined(__APPLE__)
+
+#define _DARWIN_BETTER_REALPATH
+#include <mach-o/dyld.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dlfcn.h>
+
+WAI_FUNCSPEC
+int WAI_PREFIX(getExecutablePath)(char* out, int capacity, int* dirname_length)
+{
+ char buffer1[PATH_MAX];
+ char buffer2[PATH_MAX];
+ char* path = buffer1;
+ char* resolved = NULL;
+ int length = -1;
+
+ for (;;)
+ {
+ uint32_t size = (uint32_t)sizeof(buffer1);
+ if (_NSGetExecutablePath(path, &size) == -1)
+ {
+ path = (char*)WAI_MALLOC(size);
+ if (!_NSGetExecutablePath(path, &size))
+ break;
+ }
+
+ resolved = realpath(path, buffer2);
+ if (!resolved)
+ break;
+
+ length = (int)strlen(resolved);
+ if (length <= capacity)
+ {
+ memcpy(out, resolved, length);
+
+ if (dirname_length)
+ {
+ int i;
+
+ for (i = length - 1; i >= 0; --i)
+ {
+ if (out[i] == '/')
+ {
+ *dirname_length = i;
+ break;
+ }
+ }
+ }
+ }
+
+ break;
+ }
+
+ if (path != buffer1)
+ WAI_FREE(path);
+
+ return length;
+}
+
+WAI_NOINLINE WAI_FUNCSPEC
+int WAI_PREFIX(getModulePath)(char* out, int capacity, int* dirname_length)
+{
+ char buffer[PATH_MAX];
+ char* resolved = NULL;
+ int length = -1;
+
+ for(;;)
+ {
+ Dl_info info;
+
+ if (dladdr(WAI_RETURN_ADDRESS(), &info))
+ {
+ resolved = realpath(info.dli_fname, buffer);
+ if (!resolved)
+ break;
+
+ length = (int)strlen(resolved);
+ if (length <= capacity)
+ {
+ memcpy(out, resolved, length);
+
+ if (dirname_length)
+ {
+ int i;
+
+ for (i = length - 1; i >= 0; --i)
+ {
+ if (out[i] == '/')
+ {
+ *dirname_length = i;
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ break;
+ }
+
+ return length;
+}
+
+#elif defined(__QNXNTO__)
+
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dlfcn.h>
+
+#if !defined(WAI_PROC_SELF_EXE)
+#define WAI_PROC_SELF_EXE "/proc/self/exefile"
+#endif
+
+WAI_FUNCSPEC
+int WAI_PREFIX(getExecutablePath)(char* out, int capacity, int* dirname_length)
+{
+ char buffer1[PATH_MAX];
+ char buffer2[PATH_MAX];
+ char* resolved = NULL;
+ FILE* self_exe = NULL;
+ int length = -1;
+
+ for (;;)
+ {
+ self_exe = fopen(WAI_PROC_SELF_EXE, "r");
+ if (!self_exe)
+ break;
+
+ if (!fgets(buffer1, sizeof(buffer1), self_exe))
+ break;
+
+ resolved = realpath(buffer1, buffer2);
+ if (!resolved)
+ break;
+
+ length = (int)strlen(resolved);
+ if (length <= capacity)
+ {
+ memcpy(out, resolved, length);
+
+ if (dirname_length)
+ {
+ int i;
+
+ for (i = length - 1; i >= 0; --i)
+ {
+ if (out[i] == '/')
+ {
+ *dirname_length = i;
+ break;
+ }
+ }
+ }
+ }
+
+ break;
+ }
+
+ fclose(self_exe);
+
+ return length;
+}
+
+WAI_FUNCSPEC
+int WAI_PREFIX(getModulePath)(char* out, int capacity, int* dirname_length)
+{
+ char buffer[PATH_MAX];
+ char* resolved = NULL;
+ int length = -1;
+
+ for(;;)
+ {
+ Dl_info info;
+
+ if (dladdr(WAI_RETURN_ADDRESS(), &info))
+ {
+ resolved = realpath(info.dli_fname, buffer);
+ if (!resolved)
+ break;
+
+ length = (int)strlen(resolved);
+ if (length <= capacity)
+ {
+ memcpy(out, resolved, length);
+
+ if (dirname_length)
+ {
+ int i;
+
+ for (i = length - 1; i >= 0; --i)
+ {
+ if (out[i] == '/')
+ {
+ *dirname_length = i;
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ break;
+ }
+
+ return length;
+}
+
+#elif defined(__DragonFly__) || defined(__FreeBSD__) || \
+ defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__)
+
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <dlfcn.h>
+
+#if defined(__OpenBSD__)
+
+#include <unistd.h>
+
+WAI_FUNCSPEC
+int WAI_PREFIX(getExecutablePath)(char* out, int capacity, int* dirname_length)
+{
+ char buffer1[4096];
+ char buffer2[PATH_MAX];
+ char buffer3[PATH_MAX];
+ char** argv = (char**)buffer1;
+ char* resolved = NULL;
+ int length = -1;
+
+ for (;;)
+ {
+ int mib[4] = { CTL_KERN, KERN_PROC_ARGS, getpid(), KERN_PROC_ARGV };
+ size_t size;
+
+ if (sysctl(mib, 4, NULL, &size, NULL, 0) != 0)
+ break;
+
+ if (size > sizeof(buffer1))
+ {
+ argv = (char**)WAI_MALLOC(size);
+ if (!argv)
+ break;
+ }
+
+ if (sysctl(mib, 4, argv, &size, NULL, 0) != 0)
+ break;
+
+ if (strchr(argv[0], '/'))
+ {
+ resolved = realpath(argv[0], buffer2);
+ if (!resolved)
+ break;
+ }
+ else
+ {
+ const char* PATH = getenv("PATH");
+ if (!PATH)
+ break;
+
+ size_t argv0_length = strlen(argv[0]);
+
+ const char* begin = PATH;
+ while (1)
+ {
+ const char* separator = strchr(begin, ':');
+ const char* end = separator ? separator : begin + strlen(begin);
+
+ if (end - begin > 0)
+ {
+ if (*(end -1) == '/')
+ --end;
+
+ if (((end - begin) + 1 + argv0_length + 1) <= sizeof(buffer2))
+ {
+ memcpy(buffer2, begin, end - begin);
+ buffer2[end - begin] = '/';
+ memcpy(buffer2 + (end - begin) + 1, argv[0], argv0_length + 1);
+
+ resolved = realpath(buffer2, buffer3);
+ if (resolved)
+ break;
+ }
+ }
+
+ if (!separator)
+ break;
+
+ begin = ++separator;
+ }
+
+ if (!resolved)
+ break;
+ }
+
+ length = (int)strlen(resolved);
+ if (length <= capacity)
+ {
+ memcpy(out, resolved, length);
+
+ if (dirname_length)
+ {
+ int i;
+
+ for (i = length - 1; i >= 0; --i)
+ {
+ if (out[i] == '/')
+ {
+ *dirname_length = i;
+ break;
+ }
+ }
+ }
+ }
+
+ break;
+ }
+
+ if (argv != (char**)buffer1)
+ WAI_FREE(argv);
+
+ return length;
+}
+
+#else
+
+WAI_FUNCSPEC
+int WAI_PREFIX(getExecutablePath)(char* out, int capacity, int* dirname_length)
+{
+ char buffer1[PATH_MAX];
+ char buffer2[PATH_MAX];
+ char* path = buffer1;
+ char* resolved = NULL;
+ int length = -1;
+
+ for (;;)
+ {
+#if defined(__NetBSD__)
+ int mib[4] = { CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME };
+#else
+ int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
+#endif
+ size_t size = sizeof(buffer1);
+
+ if (sysctl(mib, 4, path, &size, NULL, 0) != 0)
+ break;
+
+ resolved = realpath(path, buffer2);
+ if (!resolved)
+ break;
+
+ length = (int)strlen(resolved);
+ if (length <= capacity)
+ {
+ memcpy(out, resolved, length);
+
+ if (dirname_length)
+ {
+ int i;
+
+ for (i = length - 1; i >= 0; --i)
+ {
+ if (out[i] == '/')
+ {
+ *dirname_length = i;
+ break;
+ }
+ }
+ }
+ }
+
+ break;
+ }
+
+ return length;
+}
+
+#endif
+
+WAI_NOINLINE WAI_FUNCSPEC
+int WAI_PREFIX(getModulePath)(char* out, int capacity, int* dirname_length)
+{
+ char buffer[PATH_MAX];
+ char* resolved = NULL;
+ int length = -1;
+
+ for(;;)
+ {
+ Dl_info info;
+
+ if (dladdr(WAI_RETURN_ADDRESS(), &info))
+ {
+ resolved = realpath(info.dli_fname, buffer);
+ if (!resolved)
+ break;
+
+ length = (int)strlen(resolved);
+ if (length <= capacity)
+ {
+ memcpy(out, resolved, length);
+
+ if (dirname_length)
+ {
+ int i;
+
+ for (i = length - 1; i >= 0; --i)
+ {
+ if (out[i] == '/')
+ {
+ *dirname_length = i;
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ break;
+ }
+
+ return length;
+}
+
+#else
+
+#error unsupported platform
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
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