diff options
Diffstat (limited to 'libcpp/include/line-map.h')
| -rw-r--r-- | libcpp/include/line-map.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/libcpp/include/line-map.h b/libcpp/include/line-map.h index f6242fc..d6cf816 100644 --- a/libcpp/include/line-map.h +++ b/libcpp/include/line-map.h @@ -49,6 +49,18 @@ along with this program; see the file COPYING3. If not see /* The type of line numbers. */ typedef unsigned int linenum_type; +/* A function for for use by qsort for comparing line numbers. */ + +inline int compare (linenum_type lhs, linenum_type rhs) +{ + /* Avoid truncation issues by using long long for the comparison, + and only consider the sign of the result. */ + long long diff = (long long)lhs - (long long)rhs; + if (diff) + return diff > 0 ? 1 : -1; + return 0; +} + /* Reason for creating a new line map with linemap_add. LC_ENTER is when including a new file, e.g. a #include directive in C. LC_LEAVE is when reaching a file's end. LC_RENAME is when a file |