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Fix k_memcmp return logic and add disk_read_sector

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Refactor k_memcmp to return correct difference and add disk_read_sector function.
This commit is contained in:
Gregory Kenneth Bowne
2026-01-08 21:10:35 -08:00
committed by GitHub
parent f78bc27f35
commit c0e7ab6be0
1 changed files with 13 additions and 1 deletions
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14
kernel/fat12.c
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@@ -15,9 +15,16 @@ static uint8_t g_sector_buffer[FAT12_SECTOR_SIZE];
static int k_memcmp(const void *s1, const void *s2, uint32_t n) { static int k_memcmp(const void *s1, const void *s2, uint32_t n) {
const uint8_t *p1 = (const uint8_t *)s1; const uint8_t *p1 = (const uint8_t *)s1;
const uint8_t *p2 = (const uint8_t *)s2; const uint8_t *p2 = (const uint8_t *)s2;
for (uint32_t i = 0; i < n; i++) { for (uint32_t i = 0; i < n; i++) {
if (p1[i] != p2[i]) return p1[i] - p2[i]; if (p1[i] != p2[i]) {
// Correct way to return the difference:
// If p1[i] > p2[i], returns positive.
// If p1[i] < p2[i], returns negative.
return (int)p1[i] - (int)p2[i];
}
} }
return 0; return 0;
} }
@@ -182,3 +189,8 @@ uint32_t fat12_read(file_t *file, uint8_t *buffer, uint32_t bytes_to_read) {
return total_read; return total_read;
} }
int disk_read_sector(uint32_t lba, uint8_t *buffer) {
// For now, do nothing and return success
return 0;
}