fork download 
  1. #include <stdio.h>
  2.  
  3. char *strtrim(const char *input) {
  4. 	while(*input==' ') {
  5. 		input++;
  6. 	}
  7. 	const char *start=input;
  8. 	const char *end=input;
  9. 	while(*input) {
  10. 		if(*input!=' ') {
  11. 			end=input+1;
  12. 		}
  13. 		input++;
  14. 	}
  15. 	size_t len=end-start;
  16. 	char *result=malloc(len+1);
  17. 	if(result) {
  18. 		result[len]=0;
  19. 		memcpy(result,start,len);
  20. 	}
  21. 	return result;
  22. }
  23.  
  24. void test(const char *input) {
  25. 	char *work=strtrim(input);
  26. 	printf("*%s* -> *%s*\n",input,work?work:"fail");
  27. 	free(work);
  28. }
  29.  
  30. int main(void) {
  31. 	test("test");
  32. 	test(" test");
  33. 	test("  test");
  34. 	test("test ");
  35. 	test("test  ");
  36. 	test("  te st  ");
  37. 	test("t");
  38. 	test(" t");
  39. 	test("t ");
  40. 	test("  ");
  41. 	test("");
  42. 	return 0;
  43. }
  44.  
Success #stdin #stdout 0s 5360KB
comments (?)
stdin 
Standard input is empty
stdout 
*test* -> *test*
* test* -> *test*
*  test* -> *test*
*test * -> *test*
*test  * -> *test*
*  te st  * -> *te st*
*t* -> *t*
* t* -> *t*
*t * -> *t*
*  * -> **
** -> **
https://ideone.com/lJUzV1
language:
C (gcc 8.3)
created:
2 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!