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Asked: 2026-05-28T06:24:05+00:00

I want to create log.c file with containing info(), debug() and error() functions. These

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I want to create log.c file with containing info(), debug() and error() functions.
These functions are working without printing file name, line number,..etc.
So when I call one of this function I want to dump the file name, line number, and function name of the caller. So how do we exactly trace back?
Is there a way to trace back on C or, if we use macros, how can this be done?

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1 Answer

  1. Editorial Team

    I’d pass the data to the function through parameters (maybe get the help of a macro)

    int info(const char *fname, int lineno, const char *fxname, ...) { /* ... */ }
int debug(const char *fname, int lineno, const char *fxname, ...) { /* ... */ }
int error(const char *fname, int lineno, const char *fxname, ...) { /* ... */ }

    And to call them

    info(__FILE__, __LINE__, __func__, ...);
debug(__FILE__, __LINE__, __func__, ...);
error(__FILE__, __LINE__, __func__, ...);

    Note: __func__ is C99; gcc, in mode C89 has __FUNCTION__

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