docs/gpu/support.md

(libc_gpu_support)=

# Supported Functions

The following functions and headers are supported at least partially on the
device. Some functions are implemented fully on the GPU, while others require a
{ref}`remote procedure call <libc_gpu_rpc>`.

## ctype.h

| Function Name | Available   | RPC Required |
| ------------- | ----------- | ------------ |
| isalnum       | {{ check }} |              |
| isalpha       | {{ check }} |              |
| isascii       | {{ check }} |              |
| isblank       | {{ check }} |              |
| iscntrl       | {{ check }} |              |
| isdigit       | {{ check }} |              |
| isgraph       | {{ check }} |              |
| islower       | {{ check }} |              |
| isprint       | {{ check }} |              |
| ispunct       | {{ check }} |              |
| isspace       | {{ check }} |              |
| isupper       | {{ check }} |              |
| isxdigit      | {{ check }} |              |
| toascii       | {{ check }} |              |
| tolower       | {{ check }} |              |
| toupper       | {{ check }} |              |

## string.h

| Function Name | Available   | RPC Required |
| ------------- | ----------- | ------------ |
| bcmp          | {{ check }} |              |
| bcopy         | {{ check }} |              |
| bzero         | {{ check }} |              |
| memccpy       | {{ check }} |              |
| memchr        | {{ check }} |              |
| memcmp        | {{ check }} |              |
| memcpy        | {{ check }} |              |
| memmem        | {{ check }} |              |
| memmove       | {{ check }} |              |
| mempcpy       | {{ check }} |              |
| memrchr       | {{ check }} |              |
| memset        | {{ check }} |              |
| stpcpy        | {{ check }} |              |
| stpncpy       | {{ check }} |              |
| strcat        | {{ check }} |              |
| strchr        | {{ check }} |              |
| strchrnul     | {{ check }} |              |
| strcmp        | {{ check }} |              |
| strcoll       | {{ check }} |              |
| strcpy        | {{ check }} |              |
| strcspn       | {{ check }} |              |
| strdup        | {{ check }} |              |
| strerror      | {{ check }} |              |
| strlcat       | {{ check }} |              |
| strlcpy       | {{ check }} |              |
| strlen        | {{ check }} |              |
| strncat       | {{ check }} |              |
| strncmp       | {{ check }} |              |
| strncpy       | {{ check }} |              |
| strndup       | {{ check }} |              |
| strnlen       | {{ check }} |              |
| strpbrk       | {{ check }} |              |
| strrchr       | {{ check }} |              |
| strsep        | {{ check }} |              |
| strspn        | {{ check }} |              |
| strstr        | {{ check }} |              |
| strtok        | {{ check }} |              |
| strtok_r      | {{ check }} |              |
| strxfrm       | {{ check }} |              |

## strings.h

| Function Name | Available   | RPC Required |
| ------------- | ----------- | ------------ |
| bcmp          | {{ check }} |              |
| bcopy         | {{ check }} |              |
| bzero         | {{ check }} |              |
| strcasecmp    | {{ check }} |              |
| strcasestr    | {{ check }} |              |
| index         | {{ check }} |              |
| rindex        | {{ check }} |              |

## stdbit.h

| Function Name                | Available   | RPC Required |
| ---------------------------- | ----------- | ------------ |
| stdc_leading_zeros_uc        | {{ check }} |              |
| stdc_leading_zeros_us        | {{ check }} |              |
| stdc_leading_zeros_ui        | {{ check }} |              |
| stdc_leading_zeros_ul        | {{ check }} |              |
| stdc_leading_zeros_ull       | {{ check }} |              |
| stdc_trailing_zeros_uc       | {{ check }} |              |
| stdc_trailing_zeros_us       | {{ check }} |              |
| stdc_trailing_zeros_ui       | {{ check }} |              |
| stdc_trailing_zeros_ul       | {{ check }} |              |
| stdc_trailing_zeros_ull      | {{ check }} |              |
| stdc_trailing_ones_uc        | {{ check }} |              |
| stdc_trailing_ones_us        | {{ check }} |              |
| stdc_trailing_ones_ui        | {{ check }} |              |
| stdc_trailing_ones_ul        | {{ check }} |              |
| stdc_trailing_ones_ull       | {{ check }} |              |
| stdc_first_leading_zero_uc   | {{ check }} |              |
| stdc_first_leading_zero_us   | {{ check }} |              |
| stdc_first_leading_zero_ui   | {{ check }} |              |
| stdc_first_leading_zero_ul   | {{ check }} |              |
| stdc_first_leading_zero_ull  | {{ check }} |              |
| stdc_first_leading_one_uc    | {{ check }} |              |
| stdc_first_leading_one_us    | {{ check }} |              |
| stdc_first_leading_one_ui    | {{ check }} |              |
| stdc_first_leading_one_ul    | {{ check }} |              |
| stdc_first_leading_one_ull   | {{ check }} |              |
| stdc_first_trailing_zero_uc  | {{ check }} |              |
| stdc_first_trailing_zero_us  | {{ check }} |              |
| stdc_first_trailing_zero_ui  | {{ check }} |              |
| stdc_first_trailing_zero_ul  | {{ check }} |              |
| stdc_first_trailing_zero_ull | {{ check }} |              |
| stdc_first_trailing_one_uc   | {{ check }} |              |
| stdc_first_trailing_one_us   | {{ check }} |              |
| stdc_first_trailing_one_ui   | {{ check }} |              |
| stdc_first_trailing_one_ul   | {{ check }} |              |
| stdc_first_trailing_one_ull  | {{ check }} |              |
| stdc_count_zeros_uc          | {{ check }} |              |
| stdc_count_zeros_us          | {{ check }} |              |
| stdc_count_zeros_ui          | {{ check }} |              |
| stdc_count_zeros_ul          | {{ check }} |              |
| stdc_count_zeros_ull         | {{ check }} |              |
| stdc_count_ones_uc           | {{ check }} |              |
| stdc_count_ones_us           | {{ check }} |              |
| stdc_count_ones_ui           | {{ check }} |              |
| stdc_count_ones_ul           | {{ check }} |              |
| stdc_count_ones_ull          | {{ check }} |              |
| stdc_has_single_bit_uc       | {{ check }} |              |
| stdc_has_single_bit_us       | {{ check }} |              |
| stdc_has_single_bit_ui       | {{ check }} |              |
| stdc_has_single_bit_ul       | {{ check }} |              |
| stdc_has_single_bit_ull      | {{ check }} |              |
| stdc_bit_width_uc            | {{ check }} |              |
| stdc_bit_width_us            | {{ check }} |              |
| stdc_bit_width_ui            | {{ check }} |              |
| stdc_bit_width_ul            | {{ check }} |              |
| stdc_bit_width_ull           | {{ check }} |              |
| stdc_bit_floor_uc            | {{ check }} |              |
| stdc_bit_floor_us            | {{ check }} |              |
| stdc_bit_floor_ui            | {{ check }} |              |
| stdc_bit_floor_ul            | {{ check }} |              |
| stdc_bit_floor_ull           | {{ check }} |              |
| stdc_bit_ceil_uc             | {{ check }} |              |
| stdc_bit_ceil_us             | {{ check }} |              |
| stdc_bit_ceil_ui             | {{ check }} |              |
| stdc_bit_ceil_ul             | {{ check }} |              |
| stdc_bit_ceil_ull            | {{ check }} |              |

## stdlib.h

| Function Name | Available   | RPC Required |
| ------------- | ----------- | ------------ |
| abs           | {{ check }} |              |
| atoi          | {{ check }} |              |
| atof          | {{ check }} |              |
| atol          | {{ check }} |              |
| atoll         | {{ check }} |              |
| exit          | {{ check }} | {{ check }}  |
| abort         | {{ check }} | {{ check }}  |
| system        | {{ check }} | {{ check }}  |
| labs          | {{ check }} |              |
| llabs         | {{ check }} |              |
| div           | {{ check }} |              |
| ldiv          | {{ check }} |              |
| lldiv         | {{ check }} |              |
| bsearch       | {{ check }} |              |
| qsort         | {{ check }} |              |
| qsort_r       | {{ check }} |              |
| strtod        | {{ check }} |              |
| strtof        | {{ check }} |              |
| strtol        | {{ check }} |              |
| strtold       | {{ check }} |              |
| strtoll       | {{ check }} |              |
| strtoul       | {{ check }} |              |
| strtoull      | {{ check }} |              |
| srand         | {{ check }} |              |
| rand          | {{ check }} |              |

## inttypes.h

| Function Name | Available   | RPC Required |
| ------------- | ----------- | ------------ |
| imaxabs       | {{ check }} |              |
| imaxdiv       | {{ check }} |              |
| strtoimax     | {{ check }} |              |
| strtoumax     | {{ check }} |              |

## stdio.h

| Function Name | Available   | RPC Required |
| ------------- | ----------- | ------------ |
| feof          | {{ check }} | {{ check }}  |
| ferror        | {{ check }} | {{ check }}  |
| clearerr      | {{ check }} | {{ check }}  |
| fseek         | {{ check }} | {{ check }}  |
| ftell         | {{ check }} | {{ check }}  |
| fflush        | {{ check }} | {{ check }}  |
| fgetc         | {{ check }} | {{ check }}  |
| fgets         | {{ check }} | {{ check }}  |
| ungetc        | {{ check }} | {{ check }}  |
| getc          | {{ check }} | {{ check }}  |
| getchar       | {{ check }} | {{ check }}  |
| puts          | {{ check }} | {{ check }}  |
| fputs         | {{ check }} | {{ check }}  |
| fputc         | {{ check }} | {{ check }}  |
| fwrite        | {{ check }} | {{ check }}  |
| remove        | {{ check }} | {{ check }}  |
| rename        | {{ check }} | {{ check }}  |
| putc          | {{ check }} | {{ check }}  |
| printf        | {{ check }} | {{ check }}  |
| vprintf       | {{ check }} | {{ check }}  |
| fprintf       | {{ check }} | {{ check }}  |
| vfprintf      | {{ check }} | {{ check }}  |
| sprintf       | {{ check }} |              |
| snprintf      | {{ check }} |              |
| vsprintf      | {{ check }} |              |
| vsnprintf     | {{ check }} |              |
| sscanf        | {{ check }} |              |
| scanf         | {{ check }} | {{ check }}  |
| fscanf        | {{ check }} | {{ check }}  |
| putchar       | {{ check }} | {{ check }}  |
| fclose        | {{ check }} | {{ check }}  |
| fopen         | {{ check }} | {{ check }}  |
| fread         | {{ check }} | {{ check }}  |

## time.h

| Function Name | Available   | RPC Required |
| ------------- | ----------- | ------------ |
| clock         | {{ check }} |              |
| clock_gettime | {{ check }} |              |
| nanosleep     | {{ check }} |              |
| strftime      | {{ check }} |              |
| strftime_l    | {{ check }} |              |

## assert.h

| Function Name   | Available   | RPC Required |
| --------------- | ----------- | ------------ |
| assert          | {{ check }} | {{ check }}  |
| `__assert_fail` | {{ check }} | {{ check }}  |