Rename QUtil::strcasecmp to QUtil::str_compare_nocase (fixes #242)

ChangeLog

@@ -1,3 +1,12 @@
+2019-06-21  Jay Berkenbilt  <ejb@ql.org>
+
+	* Source-level incompatibility: rename QUtil::strcasecmp to
+	QUtil::str_compare_nocase. This is a non-compatible change, but
+	QUtil::strcasecmp is hardly the most important part of qpdf's API.
+	The reason for this change is that strcasecmp is a macro on some
+	systems, and that was causing problems when QUtil.hh was included
+	in certain circumstances. Fixes #242.
+
 2019-06-20  Jay Berkenbilt  <ejb@ql.org>
 
 	* Enable compilation with additional warnings for integer

TODO

@@ -1,9 +1,6 @@
 Next ABI
 ========
 
- * Rename QUtil::strcasecmp since strcasecmp is a macro on some
-   platforms. See #242.
-
  * Get rid of the version of QPDF::copyForeignObject with the bool
    unused parameter.
 

include/qpdf/QUtil.hh

@@ -305,8 +305,11 @@ namespace QUtil
     QPDF_DLL
     std::list<std::string> read_lines_from_file(std::istream&);
 
+    // This used to be called strcasecmp, but that is a macro on some
+    // platforms, so we have to give it a name that is not likely to
+    // be a macro anywhere.
     QPDF_DLL
-    int strcasecmp(char const *, char const *);
+    int str_compare_nocase(char const *, char const *);
 
     // These routines help the tokenizer recognize certain character
     // classes without using ctype, which we avoid because of locale

libqpdf/QUtil.cc

@@ -997,14 +997,14 @@ QUtil::read_lines_from_file(std::istream& in)
 }
 
 int
-QUtil::strcasecmp(char const *s1, char const *s2)
+QUtil::str_compare_nocase(char const *s1, char const *s2)
 {
 #if defined(_WIN32) && defined(__BORLANDC__)
     return stricmp(s1, s2);
 #elif defined(_WIN32)
     return _stricmp(s1, s2);
 #else
-    return ::strcasecmp(s1, s2);
+    return strcasecmp(s1, s2);
 #endif
 }
 

qpdf/qpdf.cc

@@ -4981,7 +4981,8 @@ static void write_outfile(QPDF& pdf, Options& o)
             after = num_spot + 2;
         }
         else if ((len >= 4) &&
-                 (QUtil::strcasecmp(o.outfilename + len - 4, ".pdf") == 0))
+                 (QUtil::str_compare_nocase(
+                     o.outfilename + len - 4, ".pdf") == 0))
         {
             QTC::TC("qpdf", "qpdf split-pages .pdf");
             before = std::string(o.outfilename, len - 4) + "-";