Is there a way to prevent sprintf from writing a terminating nul past the end of the destination

[JBonn]

..

[Piranha]

Not only terminating null character, but it can write anything past the end. It's strongly recommended to not use it at all. Instead snprintf() must be used.

[JBonn]

Piranha<>, WOW! Thanks! Did not know snprintf existed. Also did not know that printf was so difficult to deal with. Jerry Bonner

[Tesla DeLorean]

No,

But sprintf() does return the length of the string added, but whatever buffering you have needs to be able to accommodate the C string properly.

The length would allow you to advance the pointer to the NUL, or memcpy() to a spot you can't tolerate the NUL

[JBonn]

Tesla,
Thanks for your answer.
Please help me get around this problem.
Here is my current code.
char char One_LCD[1], Two_LCD[], Three_LCD[];
uint8_t Gain; // Gain is always a single digit value
sprintf (One_LCD,"%1d",Gain); // I think you told me that this pollutes Two_LCD
OLED_countDraw (1,1,66,One_LCD);
OLED_countDraw is a program I wrote for STM32L4 chips to draw characters on an OLED graphic display
The above code will draw a 6 by 8 character on line 1 of 4 lines starting at the 66th place on 128 place line.
It is my way of placing characters at specified places on a graphic display.
How do I keep the sprint code above from polluting the Two_LCD space?
Would the following code display the correct Gain and not pollute Three_LCD?
sprintf (Two_LCD,"%1d",Gain);
OLED_countDraw (1, 1, 66, Two_LCD);
Jerry Bonner

[Tesla DeLorean]

Why can't you make these strings wide enough to carry the data?

You don't show the prototype for OLED_countDraw, if it takes a char, pass a char

char char String[4];

sprintf (String,"%1d",Gain);

OLED_countDraw (1,1,66,String[0]); // First character

OLED_countDraw (1,1,66,String[1]); // Second character

If it expects the string, ie char *

OLED_countDraw (1,1,66,String); // Pass as string

[JBonn]

Tesla, I do not understand your reaction. I said "WOW" because i liked your response and followed that with a "Thanks". I apologize to you if if you think I responded to your answer in a negative way. I meant my response to be a "Thank You".

[Piranha]

That was meant to me... ;)

[JBonn]

Thanks to all the answers. Am looking at all of them. There is evidently more than one way to solve my problem. I am investigating to determine which approach to take. Thanks again to all who answered, including you, Tesla.