#include <stdio.h>
#include <string.h>
-const char *text = "hi there friend";
+const char *BLANKS = " \t";
+const char *TEXT = " hi there friend";
/* 01234567890123456789
- ^ ^
+ ^ ^
*/
+char *
+trim_leading_blanks(char *str)
+{
+ size_t offset = strspn(str, BLANKS);
+ if (offset == strlen(str)) {
+ /* All blanks. */
+ return NULL;
+ }
+ return str + offset;
+}
+
int
main(void)
{
- char *rest;
+ char *rest, *text;
ptrdiff_t diff;
+ text = trim_leading_blanks((char *)TEXT);
rest = strpbrk(text, " []");
while (NULL != rest) {
diff = rest - text;