Add utility function for processing a string buffer by line

src/console_cmds.cpp

@@ -43,6 +43,7 @@
 #include "airport.h"
 #include "station_base.h"
 #include "economy_func.h"
+#include "string_func_extra.h"
 
 #include "safeguards.h"
 
@@ -1063,15 +1064,9 @@ DEF_CONSOLE_CMD(ConRestart)
  */
 static void PrintLineByLine(char *buf)
 {
-	char *p = buf;
+	ProcessLineByLine(buf, [&](const char *line) {
-	/* Print output line by line */
+		IConsolePrintF(CC_DEFAULT, "%s", line);
-	for (char *p2 = buf; *p2 != '\0'; p2++) {
+	});
-		if (*p2 == '\n') {
-			*p2 = '\0';
-			IConsolePrintF(CC_DEFAULT, "%s", p);
-			p = p2 + 1;
-		}
-	}
 }
 
 DEF_CONSOLE_CMD(ConListAILibs)

src/string_func_extra.h

@@ -20,4 +20,21 @@ static inline void str_validate(std::string &str, StringValidationSettings setti
 	str.resize(str_validate_intl(buf, buf + str.size(), settings) - buf);
 }
 
+template <typename F>
+inline void ProcessLineByLine(char *buf, F line_functor)
+{
+	char *p = buf;
+	char *p2 = buf;
+	/* Print output line by line */
+	for (; *p2 != '\0'; p2++) {
+		if (*p2 == '\n') {
+			*p2 = '\0';
+			line_functor(p);
+			p = p2 + 1;
+		}
+	}
+	if (p < p2) line_functor(p);
+}
+
+
 #endif /* STRING_FUNC_EXTRA_H */