gnu error format

alaios · 08-20-2005, 02:21 AM

Hi i have found the following text to the gnu coding manual

Quote:

4.3 Formatting Error Messages

Error messages from compilers should look like this:

source-file-name:lineno: message

Do u know how i can print the line that created the error?

sind · 08-20-2005, 02:45 AM

The GNU C preprocessor will expand __FILE__ and __LINE__ in your source files to the filename, ie "test.c" (as a string), and the line number (as an integer), respectively.

So you could have something like this:

Code:

fprintf(stderr, "%s: %d: error\n", __FILE__, __LINE__);

That won't show you the line that caused the error, but it should help you find that line more easily.

~sind

alaios · 08-20-2005, 02:58 AM

Thx a lot really

alaios · 08-21-2005, 10:36 AM

Thx a lot i have tried that but as we can easily understand cant work
perror("Please check the %s : %d \n",__FILE__,__LINE__);
Do u have something to suggest me so as to provide this functionality to my site

sind · 08-21-2005, 11:09 PM

AFAIK, perror() does not support format strings. You can use fprintf() to stderr with strerror() to acheive the same result as perror(), while being able to use format strings.

For example:

Code:

fprintf(stderr, "%s: %d: %s\n", __FILE__, __LINE__, strerror(errno));

~sind

alaios · 08-21-2005, 11:27 PM

Thx really for your time

strerror(errno)) prints exactly the same message with perror right?
I ll check it later... thanx a lot