Add abspath to fileop

fileop.cpp

@@ -24,6 +24,7 @@
 #include "time_util.h"
 #include <regex>
 #include <list>
+#include <malloc.h>
 
 #ifdef _WIN32
 #if HAVE__ACCESS_S
@@ -114,6 +115,16 @@ bool listdir_internal(wchar_t* fn, std::list<std::string>& list, bool ignore_hid
     return true;
 }
 
+std::string realpath_internal(wchar_t* fn) {
+    DWORD len = GetFullPathNameW(fn, 0, nullptr, nullptr);
+    wchar_t* buf = (wchar_t*)malloc(sizeof(wchar_t) * len);
+    GetFullPathNameW(fn, len, buf, nullptr);
+    std::string re;
+    wchar_util::wstr_to_str(re, buf, CP_UTF8);
+    free(buf);
+    return re;
+}
+
 template <typename T, typename ... Args>
 T fileop_internal(const char* fname, UINT codePage, T(*callback)(wchar_t* fn, Args... args), T failed, Args... args) {
     int wlen;
@@ -708,3 +719,27 @@ std::string fileop::extname(std::string path) {
     }
     return path.substr(loc + 1, path.length() - loc - 1);
 }
+
+std::string fileop::abspath(std::string path) {
+#if _WIN32
+    UINT cp[] = { CP_UTF8, CP_OEMCP, CP_ACP };
+    int i;
+    std::string re;
+    for (i = 0; i < 3; i++) {
+        re = fileop_internal<std::string>(path.c_str(), cp[i], &realpath_internal, "");
+        if (!re.empty()) return re;
+    }
+    DWORD len = GetFullPathNameA(path.c_str(), 0, nullptr, nullptr);
+    char* buf = (char*)malloc(sizeof(char) * len);
+    GetFullPathNameA(path.c_str(), len, buf, nullptr);
+    auto re2 = std::string(buf);
+    free(buf);
+    return re2;
+#else
+    char* rp = realpath(path.c_str(), nullptr);
+    if (!rp) return path;
+    std::string re(rp);
+    free(rp);
+    return re;
+#endif
+}

fileop.h

@@ -205,5 +205,11 @@ namespace fileop {
      * @return File extension name. If no extension, will return empty string.
     */
     std::string extname(std::string path);
+    /**
+     * @brief Convert a relative path to an absolute path
+     * @param path Path
+     * @return Absolute path
+    */
+    std::string abspath(std::string path);
 }
 #endif