limine/common/lib/misc.s2.c
2022-09-17 13:53:57 +02:00

111 lines
2.7 KiB
C

#include <stdint.h>
#include <stddef.h>
#include <lib/misc.h>
#include <lib/print.h>
bool verbose = false;
bool quiet = false;
bool serial = false;
bool hash_mismatch_panic = false;
uint8_t bcd_to_int(uint8_t val) {
return (val & 0x0f) + ((val & 0xf0) >> 4) * 10;
}
uint8_t int_to_bcd(uint8_t val) {
return (val % 10) | (val / 10) << 4;
}
int digit_to_int(char c) {
if (c >= 'a' && c <= 'f') {
return (c - 'a') + 10;
}
if (c >= 'A' && c <= 'F') {
return (c - 'A') + 10;
}
if (c >= '0' && c <= '9'){
return c - '0';
}
return -1;
}
uint64_t strtoui(const char *s, const char **end, int base) {
uint64_t n = 0;
for (size_t i = 0; ; i++) {
int d = digit_to_int(s[i]);
if (d == -1) {
if (end != NULL)
*end = &s[i];
break;
}
n = n * base + d;
}
return n;
}
void get_absolute_path(char *path_ptr, const char *path, const char *pwd) {
char *orig_ptr = path_ptr;
if (!*path) {
strcpy(path_ptr, pwd);
return;
}
if (*path != '/') {
strcpy(path_ptr, pwd);
path_ptr += strlen(path_ptr);
} else {
*path_ptr = '/';
path_ptr++;
path++;
}
goto first_run;
for (;;) {
switch (*path) {
case '/':
path++;
first_run:
if (*path == '/') continue;
if ((!strncmp(path, ".\0", 2))
|| (!strncmp(path, "./\0", 3))) {
goto term;
}
if ((!strncmp(path, "..\0", 3))
|| (!strncmp(path, "../\0", 4))) {
while (*path_ptr != '/') path_ptr--;
if (path_ptr == orig_ptr) path_ptr++;
goto term;
}
if (!strncmp(path, "../", 3)) {
while (*path_ptr != '/') path_ptr--;
if (path_ptr == orig_ptr) path_ptr++;
path += 2;
*path_ptr = 0;
continue;
}
if (!strncmp(path, "./", 2)) {
path += 1;
continue;
}
if (((path_ptr - 1) != orig_ptr) && (*(path_ptr - 1) != '/')) {
*path_ptr = '/';
path_ptr++;
}
continue;
case '\0':
term:
if ((*(path_ptr - 1) == '/') && ((path_ptr - 1) != orig_ptr))
path_ptr--;
*path_ptr = 0;
return;
default:
*path_ptr = *path;
path++;
path_ptr++;
continue;
}
}
}