strcspn

Your mission

Implement gm_strcspn, your own strcspn, which scans a string from the beginning and returns the index of the first character that appears in a given reject set.

See it in action

gm_strcspn("grep found nothing", "xyz")

Expected result

Your checklist

For your own tracking. Tests grade your code.

The function takes two null-terminated strings: s and reject.
Walk through s from index 0. For each character, check whether it appears anywhere in reject.
Return the index of the first such character. If no character in s is found in reject, return the length of s.
Do not call any library function to do the scanning for you.

More examples

gm_strcspn("branch", "aeiou")

Expected result

gm_strcspn("", "abc")

Expected result

Constraints

Expected files

strcspn.c

Allowed functions

None. Write every helper yourself.

Allowed headers

<stddef.h>defines size_t

libc

Standard C library

Implements the contract of a function from the standard C library.

strcspn

Strings: walking and searching

Your mission

Implement gm_strcspn, your own strcspn, which scans a string from the beginning and returns the index of the first character that appears in a given reject set.

See it in action

gm_strcspn("grep found nothing", "xyz")

Expected result

Your checklist

For your own tracking. Tests grade your code.

The function takes two null-terminated strings: s and reject.
Walk through s from index 0. For each character, check whether it appears anywhere in reject.
Return the index of the first such character. If no character in s is found in reject, return the length of s.
Do not call any library function to do the scanning for you.

More examples

gm_strcspn("branch", "aeiou")

Expected result

gm_strcspn("", "abc")

Expected result

Constraints

Expected files

strcspn.c

Allowed functions

None. Write every helper yourself.

Allowed headers

<stddef.h>defines size_t

libc

Standard C library

Implements the contract of a function from the standard C library.

Tests

Run the tests to grade your code

Build your code, then check each test here. Open a result to inspect its output.

Build

01Empty source stringWaiting

02First vowel in sWaiting

03No reject character foundWaiting

04All characters in reject setWaiting

05Reject set has no overlapWaiting

strcspn

Your mission

Implement gm_strcspn, your own strcspn, which scans a string from the beginning and returns the index of the first character that appears in a given reject set.

See it in action

gm_strcspn("grep found nothing", "xyz")

Expected result

Your checklist

For your own tracking. Tests grade your code.

The function takes two null-terminated strings: s and reject.
Walk through s from index 0. For each character, check whether it appears anywhere in reject.
Return the index of the first such character. If no character in s is found in reject, return the length of s.
Do not call any library function to do the scanning for you.

More examples

gm_strcspn("branch", "aeiou")

Expected result

gm_strcspn("", "abc")

Expected result

Constraints

Expected files

strcspn.c

Allowed functions

None. Write every helper yourself.

Allowed headers

<stddef.h>defines size_t

libc

Standard C library

Implements the contract of a function from the standard C library.

strcspn

Strings: walking and searching

Your mission

Implement gm_strcspn, your own strcspn, which scans a string from the beginning and returns the index of the first character that appears in a given reject set.

See it in action

gm_strcspn("grep found nothing", "xyz")

Expected result

Your checklist

For your own tracking. Tests grade your code.

The function takes two null-terminated strings: s and reject.
Walk through s from index 0. For each character, check whether it appears anywhere in reject.
Return the index of the first such character. If no character in s is found in reject, return the length of s.
Do not call any library function to do the scanning for you.

More examples

gm_strcspn("branch", "aeiou")

Expected result

gm_strcspn("", "abc")

Expected result

Constraints

Expected files

strcspn.c

Allowed functions

None. Write every helper yourself.

Allowed headers

<stddef.h>defines size_t

libc

Standard C library

Implements the contract of a function from the standard C library.

Tests

Run the tests to grade your code

Build your code, then check each test here. Open a result to inspect its output.

Build

01Empty source stringWaiting

02First vowel in sWaiting

03No reject character foundWaiting

04All characters in reject setWaiting

05Reject set has no overlapWaiting