unix path searching C function [closed]
Use PATH = getenv("PATH") to get the path string from the environment, then use successive calls to strtok(PATH,":") then strtok(NULL,":") to parse out the paths from the PATH string into an array of char **path, which you will need to allocate with malloc(). Place path[x] + '/' + argv[0] into a buffer, and use access(buffer, X_OK) to see if you can execute your file at that path location, if so, perform your execv(buffer,argv).
If you can't use execvp, you could get the PATH variable from char** environ from <unistd.h> or char* getenv(const char* name) from <stdlib.h> then use int access(const char* filename, int mode) to see if the file exists and is executable.I'll leave the implementation up to you as it's a school project.