Strange behaviour strstr() function

Hi, I use RealView MDK-ARM 3.15b. When I call tge strstr function to search a substring in a larger string it always return NULL. This is my code char* ptr; char str1[80] ; char str2[80];...
Strange behaviour strstr() function

Hi, I use RealView MDK-ARM 3.15b. When I call tge strstr function to search a substring in a larger string it always return NULL. This is my code char* ptr; char str1[80] ; char str2[80];...
why does strstr return a pointer to a signed char?

Sorry for the basic question, but why does it not return a pointer to an unsigned char? I mean, I looked in K&R but it does explain the rational (as far as I could tell...) Thanks
why does strstr return a pointer to a signed char?

Sorry for the basic question, but why does it not return a pointer to an unsigned char? I mean, I looked in K&R but it does explain the rational (as far as I could tell...) Thanks
does strstr function work with keil,if yes how?

does strstr function work with keil,if yes how?