[LyX/master] Fix warnings in support/.

[Richard Kimberly Heck]

commit 99bf96c56b27f2efc368cf61000b34f21adfc9e4
Author: Richard Kimberly Heck <rikiheck at lyx.org>
Date:   Sat Feb 29 00:00:47 2020 -0500

    Fix warnings in support/.
---
 src/support/ForkedCalls.cpp |    2 +-
 src/support/convert.cpp     |   14 +++++++-------
 src/support/docstream.cpp   |    2 +-
 src/support/filetools.cpp   |    2 +-
 src/support/gzstream.cpp    |   10 +++++-----
 src/support/lassert.cpp     |    5 +++--
 src/support/lyxtime.cpp     |    2 +-
 7 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/src/support/ForkedCalls.cpp b/src/support/ForkedCalls.cpp
index f81c1d2..1318bd3 100644
--- a/src/support/ForkedCalls.cpp
+++ b/src/support/ForkedCalls.cpp
@@ -374,7 +374,7 @@ int ForkedCall::generateChild()
 			argv.push_back(&*it);
 		prev = *it;
 	}
-	argv.push_back(0);
+	argv.push_back(nullptr);
 
 	// Debug output.
 	if (lyxerr.debugging(Debug::FILES)) {
diff --git a/src/support/convert.cpp b/src/support/convert.cpp
index 9455643..74b1282 100644
--- a/src/support/convert.cpp
+++ b/src/support/convert.cpp
@@ -179,49 +179,49 @@ docstring convert<docstring>(double d)
 template<>
 int convert<int>(string const s)
 {
-	return strtol(s.c_str(), 0, 10);
+	return strtol(s.c_str(), nullptr, 10);
 }
 
 
 template<>
 int convert<int>(docstring const s)
 {
-	return strtol(to_ascii(s).c_str(), 0, 10);
+	return strtol(to_ascii(s).c_str(), nullptr, 10);
 }
 
 
 template<>
 unsigned int convert<unsigned int>(string const s)
 {
-	return strtoul(s.c_str(), 0, 10);
+	return strtoul(s.c_str(), nullptr, 10);
 }
 
 
 template<>
 unsigned long convert<unsigned long>(string const s)
 {
-	return strtoul(s.c_str(), 0, 10);
+	return strtoul(s.c_str(), nullptr, 10);
 }
 
 
 template<>
 double convert<double>(string const s)
 {
-	return strtod(s.c_str(), 0);
+	return strtod(s.c_str(), nullptr);
 }
 
 
 template<>
 int convert<int>(char const * cptr)
 {
-	return strtol(cptr, 0, 10);
+	return strtol(cptr, nullptr, 10);
 }
 
 
 template<>
 double convert<double>(char const * cptr)
 {
-	return strtod(cptr, 0);
+	return strtod(cptr, nullptr);
 }
 
 
diff --git a/src/support/docstream.cpp b/src/support/docstream.cpp
index f8964ca..eef5b03 100644
--- a/src/support/docstream.cpp
+++ b/src/support/docstream.cpp
@@ -120,7 +120,7 @@ protected:
 		// As a workaround, we append a nul char in order to force
 		// a switch to ASCII, and then remove it from output after
 		// the conversion.
-		intern_type * from_new = 0;
+		intern_type * from_new = nullptr;
 		intern_type const * from_old = from;
 		size_t extra = 0;
 		if (*(from_end - 1) >= 0x80 && encoding_ == "ISO-2022-JP") {
diff --git a/src/support/filetools.cpp b/src/support/filetools.cpp
index a34ee22..d17d04c 100644
--- a/src/support/filetools.cpp
+++ b/src/support/filetools.cpp
@@ -110,7 +110,7 @@ bool isBinaryFile(FileName const & filename)
 	magic_t magic_cookie = magic_open(MAGIC_MIME_ENCODING);
 	if (magic_cookie) {
 		bool detected = true;
-		if (magic_load(magic_cookie, NULL) != 0) {
+		if (magic_load(magic_cookie, nullptr) != 0) {
 			LYXERR(Debug::FILES, "isBinaryFile: "
 				"Could not load magic database - "
 				<< magic_error(magic_cookie));
diff --git a/src/support/gzstream.cpp b/src/support/gzstream.cpp
index dfad995..232e86b 100644
--- a/src/support/gzstream.cpp
+++ b/src/support/gzstream.cpp
@@ -51,12 +51,12 @@ namespace GZSTREAM_NAMESPACE {
 
 gzstreambuf* gzstreambuf::open( const char* name, int open_mode) {
     if ( is_open())
-        return (gzstreambuf*)0;
+		return (gzstreambuf*)(nullptr);
     mode = open_mode;
     // no append nor read/write mode
     if ((mode & ios::ate) || (mode & ios::app)
         || ((mode & ios::in) && (mode & ios::out)))
-        return (gzstreambuf*)0;
+		return (gzstreambuf*)(nullptr);
     char  fmode[10];
     char* fmodeptr = fmode;
     if ( mode & ios::in)
@@ -66,8 +66,8 @@ gzstreambuf* gzstreambuf::open( const char* name, int open_mode) {
     *fmodeptr++ = 'b';
     *fmodeptr = '\0';
     file = gzopen( name, fmode);
-    if (file == 0)
-        return (gzstreambuf*)0;
+	if (file == nullptr)
+		return (gzstreambuf*)(nullptr);
     opened = 1;
     return this;
 }
@@ -79,7 +79,7 @@ gzstreambuf * gzstreambuf::close() {
         if ( gzclose( file) == Z_OK)
             return this;
     }
-    return (gzstreambuf*)0;
+	return (gzstreambuf*)(nullptr);
 }
 
 int gzstreambuf::underflow() { // used for input buffer only
diff --git a/src/support/lassert.cpp b/src/support/lassert.cpp
index c690dbc..2634749 100644
--- a/src/support/lassert.cpp
+++ b/src/support/lassert.cpp
@@ -111,7 +111,7 @@ docstring printCallStack()
 	docstring bt;
 	for (size_t i = 1; i < size && messages != NULL; i++) {
 		const std::string orig(messages[i]);
-		char* mangled = 0;
+		char* mangled = nullptr;
 		for (char *p = messages[i]; *p; ++p) {
 			if (*p == '(') {
 				*p = 0;
@@ -122,7 +122,8 @@ docstring printCallStack()
 			}
 		}
 		int status = 0;
-		const char* demangled = abi::__cxa_demangle(mangled, 0, 0, &status);
+		const char* demangled =
+			abi::__cxa_demangle(mangled, nullptr, nullptr, &status);
 		const QByteArray line = QString("(%1) %2: %3\n").arg(i, 3).arg(messages[i])
 								.arg(demangled ? demangled : orig.c_str()).toLocal8Bit();
 		free((void*)demangled);
diff --git a/src/support/lyxtime.cpp b/src/support/lyxtime.cpp
index f3318eb..c155ed4 100644
--- a/src/support/lyxtime.cpp
+++ b/src/support/lyxtime.cpp
@@ -27,7 +27,7 @@ namespace support {
 
 time_t current_time()
 {
-	return time(0);
+	return time(nullptr);
 }