v0.40: Create exercises. Challenge the community.

strdup

Your mission

Implement gm_strdup, your own strdup, which allocates a fresh buffer on the heap and copies a string into it, byte by byte, including the null terminator.

See it in action

gm_strdup("oh my zsh")

Expected result

"oh my zsh"

Your checklist

For your own tracking. Tests grade your code.

Accept a single null-terminated string src as the parameter.
Compute the length of src to determine how many bytes to allocate.
Call malloc to reserve exactly length + 1 bytes.
Copy every character from src into the new buffer, then append '\0'.
Return the pointer to the newly allocated string.
Return NULL if malloc fails.

More examples

gm_strdup("")

Expected result

""

Constraints

Expected files

strdup.c

Allowed functions

malloc

Allowed headers

<stdlib.h>declares malloc

<stddef.h>defines NULL

strdup

Dynamic memory

Your mission

Implement gm_strdup, your own strdup, which allocates a fresh buffer on the heap and copies a string into it, byte by byte, including the null terminator.

See it in action

gm_strdup("oh my zsh")

Expected result

"oh my zsh"

Your checklist

For your own tracking. Tests grade your code.

Accept a single null-terminated string src as the parameter.
Compute the length of src to determine how many bytes to allocate.
Call malloc to reserve exactly length + 1 bytes.
Copy every character from src into the new buffer, then append '\0'.
Return the pointer to the newly allocated string.
Return NULL if malloc fails.

More examples

gm_strdup("")

Expected result

""

Constraints

Expected files

strdup.c

Allowed functions

malloc

Allowed headers

<stdlib.h>declares malloc

<stddef.h>defines NULL

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 stringWaiting

02Dev-culture sampleWaiting

03Single characterWaiting

04Short phraseWaiting

05String with multiple spacesWaiting

strdup

Your mission

Implement gm_strdup, your own strdup, which allocates a fresh buffer on the heap and copies a string into it, byte by byte, including the null terminator.

See it in action

gm_strdup("oh my zsh")

Expected result

"oh my zsh"

Your checklist

For your own tracking. Tests grade your code.

Accept a single null-terminated string src as the parameter.
Compute the length of src to determine how many bytes to allocate.
Call malloc to reserve exactly length + 1 bytes.
Copy every character from src into the new buffer, then append '\0'.
Return the pointer to the newly allocated string.
Return NULL if malloc fails.

More examples

gm_strdup("")

Expected result

""

Constraints

Expected files

strdup.c

Allowed functions

malloc

Allowed headers

<stdlib.h>declares malloc

<stddef.h>defines NULL

v0.40: Create exercises. Challenge the community.

Meet Studio →

strdup

Dynamic memory

Your mission

Implement gm_strdup, your own strdup, which allocates a fresh buffer on the heap and copies a string into it, byte by byte, including the null terminator.

See it in action

gm_strdup("oh my zsh")

Expected result

"oh my zsh"

Your checklist

For your own tracking. Tests grade your code.

Accept a single null-terminated string src as the parameter.
Compute the length of src to determine how many bytes to allocate.
Call malloc to reserve exactly length + 1 bytes.
Copy every character from src into the new buffer, then append '\0'.
Return the pointer to the newly allocated string.
Return NULL if malloc fails.

More examples

gm_strdup("")

Expected result

""

Constraints

Expected files

strdup.c

Allowed functions

malloc

Allowed headers

<stdlib.h>declares malloc

<stddef.h>defines NULL

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 stringWaiting

02Dev-culture sampleWaiting

03Single characterWaiting

04Short phraseWaiting

05String with multiple spacesWaiting