Objective

Implement a function that returns a pointer into the given string, placed on the first character that is neither a space nor a tab.

Steps

• s is a null-terminated string. The pointer you return must point inside s itself, not into a copy.
• Move forward from the start of s as long as the current character is a space ' ' or a tab '\t', then return the address where you stopped.
• Those two characters are the only ones that count as spaces here. A '\n' ends the scan like any other character, so an isspace style test is too wide.
• Only the leading run is skipped. Spaces between words and spaces at the end stay in the string you hand back.
• When s contains nothing but spaces and tabs, return the address of its '\0', so the remaining string is empty.
• An empty s returns s unchanged.
• Never write through the pointer: the tests pass string literals, and writing into one of those kills the process.
• This is not prefix_span. The count of skipped characters can be identical, but here you return the position, not a number.
• Each test prints two things: the offset of your pointer from s, then the rest of the string inside square brackets.

Objective

Implement a function that returns a pointer into the given string, placed on the first character that is neither a space nor a tab.

Steps

• s is a null-terminated string. The pointer you return must point inside s itself, not into a copy.
• Move forward from the start of s as long as the current character is a space ' ' or a tab '\t', then return the address where you stopped.
• Those two characters are the only ones that count as spaces here. A '\n' ends the scan like any other character, so an isspace style test is too wide.
• Only the leading run is skipped. Spaces between words and spaces at the end stay in the string you hand back.
• When s contains nothing but spaces and tabs, return the address of its '\0', so the remaining string is empty.
• An empty s returns s unchanged.
• Never write through the pointer: the tests pass string literals, and writing into one of those kills the process.
• This is not prefix_span. The count of skipped characters can be identical, but here you return the position, not a number.
• Each test prints two things: the offset of your pointer from s, then the rest of the string inside square brackets.