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Message: [QUOTE="Joel C. Salomon, post: 4211436"] What do you mean by "ok"? It works, if that's what you mean. If you're using C99, you might also want to add __function__ to the debug output. Given the output format, each DEBUGPRINT belongs on its own output line -- so don't make the user include the newline. Also note that you cannot use this version without additional arguments; e.g., DEBUGPRINT("got here, no variables to display\n"); is invalid. Here's some code I've used to accomplish much the same idea: /* debug_print.h */ #ifndef DEBUG_PRINT_H #define DEBUG_PRINT_H extern void debug_print(char const *file, long line, char const *func, char const *fmt, ...); #define debug_print(...) \ debug_print(__FILE__, __LINE__, __func__, __VA_ARGS__) #endif /* end debug_print.h */ /* debug_print.c */ #include <stdio.h> #include <stdarg.h> #include "debug_print.h" #undef debug_print void debug_print(char const *file, long line, char const *func, char const *fmt, ...) { fprintf(stderr, "[%s:%ld, %s()] ", file, line, func); va_list args; va_start(args, fmt); vfprintf(stderr, fmt, args); va_end(args); fprintf(stderr, "\n"); } /* end debug_print.h */ (Actually, my code style include saving argv[0] in a global variable, and I include that as well.) Share & enjoy. --Joel [/QUOTE]