Sync path_conv.pp with msys2-runtime

runtime/path_convert/src/path_conv.cpp

@@ -269,7 +269,7 @@ void find_end_of_rooted_path(const char** from, const char** to, int* in_string)
 void sub_convert(const char** from, const char** to, char** dst, const char* dstend, int* in_string) {
     const char* copy_from = *from;
     path_type type = find_path_start_and_type(from, false, *to);
-    debug_printf("found type %d for path %s\n", type, copy_from);
+    debug_printf("found type %d for path %s", type, copy_from);
 
     if (type == POSIX_PATH_LIST) {
         find_end_of_posix_list(to, in_string);
@@ -372,6 +372,65 @@ path_type find_path_start_and_type(const char** src, int recurse, const char* en
 
     if (*it == '\0' || it == end) return NONE;
 
+    /*
+     * Skip path mangling when environment indicates it.
+     */
+    const char *no_pathconv = getenv ("MSYS_NO_PATHCONV");
+
+    if (no_pathconv) {
+        *src = end;
+        return NONE;
+    }
+
+    /* Let's not convert ~/.file to ~C:\msys64\.file */
+    if (*it == '~') {
+skip_p2w:
+        *src = end;
+        return NONE;
+    }
+
+    /*
+     * Prevent Git's :file.txt and :/message syntax from beeing modified.
+     */
+    if (*it == ':')
+        goto skip_p2w;
+
+    while (it != end && *it) {
+        switch (*it) {
+        case '`':
+        case '\'':
+        case '"':
+        case '*':
+        case '?':
+        case '[':
+        case ']':
+            goto skip_p2w;
+        case '/':
+            if (it + 1 < end && it[1] == '~')
+                goto skip_p2w;
+            break;
+        case ':':
+            // Avoid mangling IPv6 addresses
+            if (it + 1 < end && it[1] == ':')
+                goto skip_p2w;
+
+            // Leave Git's <rev>:./name syntax alone
+            if (it + 1 < end && it[1] == '.') {
+                if (it + 2 < end && it[2] == '/')
+                    goto skip_p2w;
+                if (it + 3 < end && it[2] == '.' && it[3] == '/')
+                    goto skip_p2w;
+            }
+            break;
+        case '@':
+            // Paths do not contain '@@'
+            if (it + 1 < end && it[1] == '@')
+                goto skip_p2w;
+        }
+        ++it;
+    }
+    it = *src;
+
     while (!isalnum(*it) && *it != '/' && *it != '\\' && *it != ':' && *it != '-' && *it != '.') {
         recurse = true;
         it = ++*src;
@@ -380,6 +439,13 @@ path_type find_path_start_and_type(const char** src, int recurse, const char* en
 
     path_type result = NONE;
 
+    if (it + 1 == end) {
+        switch (*it) {
+        case '/':   return ROOTED_PATH ;
+        default:    return SIMPLE_WINDOWS_PATH;
+        }
+    }
+
     if (isalpha(*it) && *(it + 1) == ':') {
         if (*(it + 2) == '\\') {
             return SIMPLE_WINDOWS_PATH;
@@ -437,6 +503,8 @@ path_type find_path_start_and_type(const char** src, int recurse, const char* en
 
     int starts_with_minus = 0;
     int starts_with_minus_alpha = 0;
+    int only_dots = *it == '.';
+    int has_slashes = 0;
     if (*it == '-') {
       starts_with_minus = 1;
       it += 1;
@@ -455,7 +523,7 @@ path_type find_path_start_and_type(const char** src, int recurse, const char* en
             if (isalpha(ch) && (*(it2+1) == ':') && (*(it2+2) == '/')) {
                 return SIMPLE_WINDOWS_PATH;
             }
-            if (ch == '/'&& memchr(it2, ',', end - it) == NULL) {
+            if (ch == '/'&& memchr(it2, ',', end - it2) == NULL) {
                 *src = it2;
                 return find_path_start_and_type(src, true, end);
             }
@@ -480,11 +548,17 @@ path_type find_path_start_and_type(const char** src, int recurse, const char* en
                 if (ch == '/' && *(it2 + 1) == '/') {
                     return URL;
                 } else {
+                    if (!only_dots && !has_slashes)
+                        goto skip_p2w;
                     return POSIX_PATH_LIST;
                 }
             } else if (memchr(it2, '=', end - it) == NULL) {
                 return SIMPLE_WINDOWS_PATH;
             }
+        } else if (ch != '.') {
+            only_dots = 0;
+            if (ch == '/' || ch == '\\')
+                has_slashes = 1;
         }
     }