What's wrong?
#include <stdio.h>
#include <string.h>
int main(void) {
char *str= " teste";
int j = 0;
while(str[j] == ' ') j++;
memcpy(str, &str[j], strlen(&str[j])+1);
printf("%s", str);
return 0;
}
When I execute the code I only get as output:
Falha de segmentação (imagem do núcleo gravada)
While I expected spaces to be removed from str , something close to the trim() function of javascript.
If you want to use memcpy() even have to copy to another place, you can not do on top of the same string :
char *str = " teste";
int j = 0;
while (str[j] == ' ') j++;
int size = strlen(str) - j + 1;
char *result = malloc(size);
memcpy(result, str + j, size);
printf("%s", result);
See running on ideone .
Or you can do inline in a much simpler way:
char *str = " teste";
while (*str++ == ' ');
str--;
printf("%s", str);
See running on ideone .