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#include "realpath.h"
#include <sys/stat.h> // struct stat, stat()
#include <windef.h> // PATH_MAX
char* realpath(const char* path, char* resolved_path) {
/* EINVAL path is nullptr. */
if (path == nullptr) {
errno = EINVAL;
return nullptr;
}
/* If resolved_path is specified as nullptr, then realpath() uses
* malloc(3) to allocate a buffer of up to PATH_MAX bytes to hold
* the resolved pathname, and returns a pointer to this buffer.
* The caller should deallocate this buffer using free(3).
*/
if (resolved_path == nullptr) {
resolved_path = static_cast<char*>(malloc(PATH_MAX));
if (resolved_path == nullptr) {
errno = ENOMEM;
return nullptr;
}
}
struct stat statbuf;
if (stat(path, &statbuf) != 0) {
return nullptr; // stat() sets errno
}
char* fp = _fullpath(resolved_path, path, PATH_MAX);
if (fp == nullptr) {
return nullptr; // assume valid errno from _fullpath()
}
errno = 0;
return fp;
}
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