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making fat driver refuse to open a file when its name is too long rather than kernel panicking

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This commit is contained in:
Benji Dial 2021-01-24 20:02:58 -05:00
parent 782cfaa0e3
commit bd7facc4b5
1 changed files with 8 additions and 10 deletions
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18
src/kernel/fat.c
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@ -174,7 +174,7 @@ static bool try_locate_entry(const uint8_t *fat_name) {
} }
//puts first path component's fat name into fat_name_buffer, //puts first path component's fat name into fat_name_buffer,
//returns rest of path //returns rest of path, or zero on error
static const char *split_path(const char *path, uint8_t *fat_name_buffer) { static const char *split_path(const char *path, uint8_t *fat_name_buffer) {
uint8_t pi = 0, fi = 0; uint8_t pi = 0, fi = 0;
while (1) { while (1) {
@ -190,9 +190,9 @@ static const char *split_path(const char *path, uint8_t *fat_name_buffer) {
++pi; ++pi;
} }
else else
PANIC("Bad path in FAT16 driver."); return 0;
else if (((fi == 8) && (path[pi - 1] != EXT_SEP_CHAR)) || (fi == 11)) else if (((fi == 8) && (path[pi - 1] != EXT_SEP_CHAR)) || (fi == 11))
PANIC("Bad path in FAT16 driver."); return 0;
else { else {
fat_name_buffer[fi++] = (uint8_t)path[pi++]; fat_name_buffer[fi++] = (uint8_t)path[pi++];
} }
@ -206,15 +206,13 @@ static bool try_load_from_path(const struct drive *d, const char *path) {
cur_fdi = &infos[cur_id]; cur_fdi = &infos[cur_id];
uint8_t fat_name[11]; uint8_t fat_name[11];
path = split_path(path, fat_name); if (!(path = split_path(path, fat_name)) ||
if (!try_locate_root_entry(fat_name)) !try_locate_root_entry(fat_name))
return false; return false;
while (*path) { while (*path)
path = split_path(path, fat_name); if (!(path = split_path(path, fat_name)) ||
if (!try_locate_entry(fat_name)) !try_locate_entry(fat_name))
return false; return false;
}
return true; return true;
} }