diff options
author | Brett Weiland <brett_weiland@bpcspace.com> | 2021-03-24 15:42:20 -0500 |
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committer | Brett Weiland <brett_weiland@bpcspace.com> | 2021-03-24 15:42:20 -0500 |
commit | f90c075d5061b3a89316d6bf3d5b190d49049ccd (patch) | |
tree | 36265da568b852ca5c0a8b4affe706cda80c4a9d /src/kernel/libc.c | |
parent | 14b109ea24dc5cb1db948de57a2a44c80ef4622e (diff) |
renamed: kernel/include/acpi.h -> include/acpi.h
renamed: kernel/include/libc.h -> include/libc.h
renamed: kernel/include/paging.h -> include/paging.h
renamed: kernel/include/printf.h -> include/printf.h
renamed: kernel/include/serial.h -> include/serial.h
renamed: kernel/include/video.h -> include/video.h
new file: indigo_os
renamed: kernel/libs/acpi.c -> kernel/acpi.c
renamed: kernel/libs/drivers/serial.c -> kernel/drivers/serial.c
renamed: kernel/libs/drivers/video.c -> kernel/drivers/video.c
renamed: kernel/libs/libc.c -> kernel/libc.c
renamed: kernel/libs/page.c -> kernel/page.c
renamed: kernel/libs/printf.c -> kernel/printf.c
renamed: kernel/libs/printf.h -> kernel/printf.h
modified: makefile
Diffstat (limited to 'src/kernel/libc.c')
-rw-r--r-- | src/kernel/libc.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/kernel/libc.c b/src/kernel/libc.c new file mode 100644 index 0000000..dc5c0ac --- /dev/null +++ b/src/kernel/libc.c @@ -0,0 +1,60 @@ +#include <stddef.h> +#include <stdint.h> +// TODO clean up variable names +int strncmp(const char *s1, const char *s2, unsigned int n) { + int i; + for(i = 0; ((i <= n) && (s1[i] != '\0') && (s2[i] != '\0')); i++) { + if(s1[i] != s2[i]) { + return(s1[i] - s2[i]); + } + } + return(s1[i] - s2[i]); +} + +int strcmp(const char *s1, const char *s2) { + int i; + for(i = 0; ((s1[i] != '\0') && (s2[i] != '\0')); i++) { + if(s1[i] != s2[i]) { + return(s1[i] - s2[i]); + } + } + return(s1[i] - s2[i]); +} + +int memcmp(const void *s1, const void *s2, size_t n) { + const unsigned char *p1 = s1; + const unsigned char *p2 = s2; + int i; + for(i = 0; i < n; i++) { + if(p1[i] != p2[i]) { + return(p1[i] - p2[i]); + } + } + return(p1[n-1] - p2[n-1]); +} + +void strcpy(char *dest, char *src) { + for(unsigned int i = 0; src[i] != '\0'; i++){ + dest[i] = src[i]; + } +} + +void memcpy(char *dest, char *src, size_t n) { + for(unsigned int i = 0; i <= n; i++) { + dest[i] = src[i]; + } +} + +void bzero(void *dest, size_t size) { + unsigned char *p1 = dest; + for(uint64_t i = 0; i < size; i++) { + p1[i] = 0; + } +} + +//TODO move this function to a seperate math library +int ceil(float n) { + int low_n = (int)n; + if(n == (float)low_n) return(low_n); + return(low_n + 1); +} |