For embedded designers: Some microcontrollers do not support similar functions and the heap memory operations, becuase the memory size of most microcontrollers do not have the huge memory size operated on by heap memory library functions. For example the maloc() is not supported in many of the 8 bits MCUs, and many other functions that deal with large memory size. However, we can initiate a string with the pointer variable and allocate to it a size that is appropriate to the MCU type, such as char serialInput[80].

strnlen() is very helpful but my IDE does not have it and generated error: ":0:: error: (499) undefined symbol" with size_t num = strnlen(text1,2); , however I can use strlen() without problem. I am using MPLab X IDE with X8 compiler V5.5 from microchip, if I dont find the proper library I will create my own small function to generate the same output of strnlen(). That was good info, thanks Kevin.

We Waiting For More Content in C libcurl Library

Okay, I am a bit far fetched, but the length should be 4 as the last charater should be '\0'. And when the strnlen function is not available it is easy to write one. A good exercise.

en.wikipedia.org/wiki/C_POSIX_library