1 // (‑●‑●)> dual licensed under the WTFPL v2 and MIT licenses
2 // without any warranty.
3 // by Gregory Pakosz (@gpakosz)
4 // https://github.com/gpakosz/whereami
6 // in case you want to #include "whereami.c" in a larger compilation unit
7 #if !defined(WHEREAMI_H)
15 #if !defined(WAI_MALLOC) || !defined(WAI_FREE) || !defined(WAI_REALLOC)
19 #if !defined(WAI_MALLOC)
20 #define WAI_MALLOC(size) malloc(size)
23 #if !defined(WAI_FREE)
24 #define WAI_FREE(p) free(p)
27 #if !defined(WAI_REALLOC)
28 #define WAI_REALLOC(p, size) realloc(p, size)
33 #define WAI_NOINLINE __declspec(noinline)
34 #elif defined(__GNUC__)
35 #define WAI_NOINLINE __attribute__((noinline))
37 #error unsupported compiler
42 #define WAI_RETURN_ADDRESS() _ReturnAddress()
43 #elif defined(__GNUC__)
44 #define WAI_RETURN_ADDRESS() __builtin_extract_return_addr(__builtin_return_address(0))
46 #error unsupported compiler
51 #ifndef WIN32_LEAN_AND_MEAN
52 #define WIN32_LEAN_AND_MEAN
55 #pragma warning(push, 3)
63 static int WAI_PREFIX(getModulePath_)(HMODULE module, char* out, int capacity, int* dirname_length)
65 wchar_t buffer1[MAX_PATH];
66 wchar_t buffer2[MAX_PATH];
73 int length_, length__;
75 size = GetModuleFileNameW(module, buffer1, sizeof(buffer1) / sizeof(buffer1[0]));
79 else if (size == (DWORD)(sizeof(buffer1) / sizeof(buffer1[0])))
86 path_ = (wchar_t*)WAI_REALLOC(path, sizeof(wchar_t) * size_ * 2);
91 size = GetModuleFileNameW(module, path, size_);
93 while (size == size_);
101 if (!_wfullpath(buffer2, path, MAX_PATH))
103 length_ = (int)wcslen(buffer2);
104 length__ = WideCharToMultiByte(CP_UTF8, 0, buffer2, length_ , out, capacity, NULL, NULL);
107 length__ = WideCharToMultiByte(CP_UTF8, 0, buffer2, length_, NULL, 0, NULL, NULL);
111 if (length__ <= capacity && dirname_length)
115 for (i = length__ - 1; i >= 0; --i)
136 WAI_NOINLINE WAI_FUNCSPEC
137 int WAI_PREFIX(getExecutablePath)(char* out, int capacity, int* dirname_length)
139 return WAI_PREFIX(getModulePath_)(NULL, out, capacity, dirname_length);
142 WAI_NOINLINE WAI_FUNCSPEC
143 int WAI_PREFIX(getModulePath)(char* out, int capacity, int* dirname_length)
148 #if defined(_MSC_VER)
149 #pragma warning(push)
150 #pragma warning(disable: 4054)
152 if (GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT, (LPCTSTR)WAI_RETURN_ADDRESS(), &module))
153 #if defined(_MSC_VER)
157 length = WAI_PREFIX(getModulePath_)(module, out, capacity, dirname_length);
163 #elif defined(__linux__) || defined(__CYGWIN__) || defined(__sun) || defined(WAI_USE_PROC_SELF_EXE)
168 #if defined(__linux__)
169 #include <linux/limits.h>
173 #ifndef __STDC_FORMAT_MACROS
174 #define __STDC_FORMAT_MACROS
176 #include <inttypes.h>
178 #if !defined(WAI_PROC_SELF_EXE)
180 #define WAI_PROC_SELF_EXE "/proc/self/path/a.out"
182 #define WAI_PROC_SELF_EXE "/proc/self/exe"
187 int WAI_PREFIX(getExecutablePath)(char* out, int capacity, int* dirname_length)
189 char buffer[PATH_MAX];
190 char* resolved = NULL;
195 resolved = realpath(WAI_PROC_SELF_EXE, buffer);
199 length = (int)strlen(resolved);
200 if (length <= capacity)
202 memcpy(out, resolved, length);
208 for (i = length - 1; i >= 0; --i)
225 #if !defined(WAI_PROC_SELF_MAPS_RETRY)
226 #define WAI_PROC_SELF_MAPS_RETRY 5
229 #if !defined(WAI_PROC_SELF_MAPS)
231 #define WAI_PROC_SELF_MAPS "/proc/self/map"
233 #define WAI_PROC_SELF_MAPS "/proc/self/maps"
237 #if defined(__ANDROID__) || defined(ANDROID)
239 #include <sys/mman.h>
243 WAI_NOINLINE WAI_FUNCSPEC
244 int WAI_PREFIX(getModulePath)(char* out, int capacity, int* dirname_length)
249 for (int r = 0; r < WAI_PROC_SELF_MAPS_RETRY; ++r)
251 maps = fopen(WAI_PROC_SELF_MAPS, "r");
257 char buffer[PATH_MAX < 1024 ? 1024 : PATH_MAX];
261 uint32_t major, minor;
265 if (!fgets(buffer, sizeof(buffer), maps))
268 if (sscanf(buffer, "%" PRIx64 "-%" PRIx64 " %s %" PRIx64 " %x:%x %u %s\n", &low, &high, perms, &offset, &major, &minor, &inode, path) == 8)
270 uint64_t addr = (uintptr_t)WAI_RETURN_ADDRESS();
271 if (low <= addr && addr <= high)
275 resolved = realpath(path, buffer);
279 length = (int)strlen(resolved);
280 #if defined(__ANDROID__) || defined(ANDROID)
282 &&buffer[length - 1] == 'k'
283 &&buffer[length - 2] == 'p'
284 &&buffer[length - 3] == 'a'
285 &&buffer[length - 4] == '.')
287 int fd = open(path, O_RDONLY);
290 length = -1; // retry
294 char* begin = (char*)mmap(0, offset, PROT_READ, MAP_SHARED, fd, 0);
295 if (begin == MAP_FAILED)
298 length = -1; // retry
302 char* p = begin + offset - 30; // minimum size of local file header
303 while (p >= begin) // scan backwards
305 if (*((uint32_t*)p) == 0x04034b50UL) // local file header signature found
307 uint16_t length_ = *((uint16_t*)(p + 26));
309 if (length + 2 + length_ < (int)sizeof(buffer))
311 memcpy(&buffer[length], "!/", 2);
312 memcpy(&buffer[length + 2], p + 30, length_);
313 length += 2 + length_;
322 munmap(begin, offset);
326 if (length <= capacity)
328 memcpy(out, resolved, length);
334 for (i = length - 1; i >= 0; --i)
363 #elif defined(__APPLE__)
365 #define _DARWIN_BETTER_REALPATH
366 #include <mach-o/dyld.h>
373 int WAI_PREFIX(getExecutablePath)(char* out, int capacity, int* dirname_length)
375 char buffer1[PATH_MAX];
376 char buffer2[PATH_MAX];
377 char* path = buffer1;
378 char* resolved = NULL;
383 uint32_t size = (uint32_t)sizeof(buffer1);
384 if (_NSGetExecutablePath(path, &size) == -1)
386 path = (char*)WAI_MALLOC(size);
387 if (!_NSGetExecutablePath(path, &size))
391 resolved = realpath(path, buffer2);
395 length = (int)strlen(resolved);
396 if (length <= capacity)
398 memcpy(out, resolved, length);
404 for (i = length - 1; i >= 0; --i)
424 WAI_NOINLINE WAI_FUNCSPEC
425 int WAI_PREFIX(getModulePath)(char* out, int capacity, int* dirname_length)
427 char buffer[PATH_MAX];
428 char* resolved = NULL;
435 if (dladdr(WAI_RETURN_ADDRESS(), &info))
437 resolved = realpath(info.dli_fname, buffer);
441 length = (int)strlen(resolved);
442 if (length <= capacity)
444 memcpy(out, resolved, length);
450 for (i = length - 1; i >= 0; --i)
468 #elif defined(__QNXNTO__)
476 #if !defined(WAI_PROC_SELF_EXE)
477 #define WAI_PROC_SELF_EXE "/proc/self/exefile"
481 int WAI_PREFIX(getExecutablePath)(char* out, int capacity, int* dirname_length)
483 char buffer1[PATH_MAX];
484 char buffer2[PATH_MAX];
485 char* resolved = NULL;
486 FILE* self_exe = NULL;
491 self_exe = fopen(WAI_PROC_SELF_EXE, "r");
495 if (!fgets(buffer1, sizeof(buffer1), self_exe))
498 resolved = realpath(buffer1, buffer2);
502 length = (int)strlen(resolved);
503 if (length <= capacity)
505 memcpy(out, resolved, length);
511 for (i = length - 1; i >= 0; --i)
531 int WAI_PREFIX(getModulePath)(char* out, int capacity, int* dirname_length)
533 char buffer[PATH_MAX];
534 char* resolved = NULL;
541 if (dladdr(WAI_RETURN_ADDRESS(), &info))
543 resolved = realpath(info.dli_fname, buffer);
547 length = (int)strlen(resolved);
548 if (length <= capacity)
550 memcpy(out, resolved, length);
556 for (i = length - 1; i >= 0; --i)
574 #elif defined(__DragonFly__) || defined(__FreeBSD__) || \
575 defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__)
580 #include <sys/types.h>
581 #include <sys/sysctl.h>
584 #if defined(__OpenBSD__)
589 int WAI_PREFIX(getExecutablePath)(char* out, int capacity, int* dirname_length)
592 char buffer2[PATH_MAX];
593 char buffer3[PATH_MAX];
594 char** argv = (char**)buffer1;
595 char* resolved = NULL;
600 int mib[4] = { CTL_KERN, KERN_PROC_ARGS, getpid(), KERN_PROC_ARGV };
603 if (sysctl(mib, 4, NULL, &size, NULL, 0) != 0)
606 if (size > sizeof(buffer1))
608 argv = (char**)WAI_MALLOC(size);
613 if (sysctl(mib, 4, argv, &size, NULL, 0) != 0)
616 if (strchr(argv[0], '/'))
618 resolved = realpath(argv[0], buffer2);
624 const char* PATH = getenv("PATH");
628 size_t argv0_length = strlen(argv[0]);
630 const char* begin = PATH;
633 const char* separator = strchr(begin, ':');
634 const char* end = separator ? separator : begin + strlen(begin);
638 if (*(end -1) == '/')
641 if (((end - begin) + 1 + argv0_length + 1) <= sizeof(buffer2))
643 memcpy(buffer2, begin, end - begin);
644 buffer2[end - begin] = '/';
645 memcpy(buffer2 + (end - begin) + 1, argv[0], argv0_length + 1);
647 resolved = realpath(buffer2, buffer3);
663 length = (int)strlen(resolved);
664 if (length <= capacity)
666 memcpy(out, resolved, length);
672 for (i = length - 1; i >= 0; --i)
686 if (argv != (char**)buffer1)
695 int WAI_PREFIX(getExecutablePath)(char* out, int capacity, int* dirname_length)
697 char buffer1[PATH_MAX];
698 char buffer2[PATH_MAX];
699 char* path = buffer1;
700 char* resolved = NULL;
705 #if defined(__NetBSD__)
706 int mib[4] = { CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME };
708 int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
710 size_t size = sizeof(buffer1);
712 if (sysctl(mib, 4, path, &size, NULL, 0) != 0)
715 resolved = realpath(path, buffer2);
719 length = (int)strlen(resolved);
720 if (length <= capacity)
722 memcpy(out, resolved, length);
728 for (i = length - 1; i >= 0; --i)
747 WAI_NOINLINE WAI_FUNCSPEC
748 int WAI_PREFIX(getModulePath)(char* out, int capacity, int* dirname_length)
750 char buffer[PATH_MAX];
751 char* resolved = NULL;
758 if (dladdr(WAI_RETURN_ADDRESS(), &info))
760 resolved = realpath(info.dli_fname, buffer);
764 length = (int)strlen(resolved);
765 if (length <= capacity)
767 memcpy(out, resolved, length);
773 for (i = length - 1; i >= 0; --i)
793 #error unsupported platform