mirror of
https://github.com/Tom-on64/kern.git
synced 2026-11-03 18:22:22 +00:00
130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
#include <syscall.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <stddef.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
|
|
// Warning: returns an allocated buffer, must be freed!
|
|
char* _format(const char* fmt, va_list args) {
|
|
static char* buffer;
|
|
size_t len = 0;
|
|
size_t max = 256;
|
|
|
|
buffer = malloc(max);
|
|
|
|
size_t i = 0;
|
|
while (fmt[i] != '\0') {
|
|
if (len > max) {
|
|
max *= 2;
|
|
// Reallocate a larger buffer
|
|
char* temp = malloc(max);
|
|
strcpy(temp, buffer);
|
|
free(buffer);
|
|
buffer = temp;
|
|
}
|
|
|
|
// Formatting magic...
|
|
if (fmt[i] == '%') { i++;
|
|
/* TODO:
|
|
%p - pointer (0x########)
|
|
%n - ""
|
|
*/
|
|
int pad = -1;
|
|
char padc = ' ';
|
|
|
|
if (fmt[i] == '0') { i++; padc = '0'; }
|
|
if (fmt[i] >= '0' && fmt[i] <= '9') {
|
|
pad = atoi(fmt + i);
|
|
while (fmt[i] >= '0' && fmt[i] <= '9') { i++; }
|
|
}
|
|
while (pad > 0) { buffer[len++] = padc; pad--; }
|
|
|
|
char c = fmt[i++];
|
|
if (c == 'd' || c == 'x' || c == 'o') {
|
|
int base = 10;
|
|
if (c == 'x') base = 16;
|
|
else if (c == 'o') base = 8;
|
|
|
|
char* s = itoa(va_arg(args, int), base);
|
|
if (pad == 0) len -= strlen(s);
|
|
while ((buffer[len++] = *s++) != '\0');
|
|
len--;
|
|
} else if (c == 'c') {
|
|
if (pad == 0) len--;
|
|
buffer[len++] = va_arg(args, char);
|
|
} else if (c == 's') {
|
|
char* s = va_arg(args, char*);
|
|
if (pad == 0) len -= strlen(s);
|
|
while ((buffer[len++] = *s++) != '\0');
|
|
len--;
|
|
} else if (c == '%') {
|
|
buffer[len++] = '%';
|
|
} else {
|
|
buffer[len++] = '%';
|
|
if (padc == '0') { buffer[len++] = '0'; }
|
|
if (pad > 0) { buffer[len++] = '#'; } // TODO
|
|
buffer[len++] = c;
|
|
}
|
|
} else { buffer[len++] = fmt[i++]; }
|
|
}
|
|
|
|
buffer[len] = '\0';
|
|
return buffer;
|
|
}
|
|
|
|
int sprintf(char* str, const char* fmt, ...) {
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
|
|
char* buffer = _format(fmt, args);
|
|
strcpy(str, buffer);
|
|
free(buffer);
|
|
va_end(args);
|
|
|
|
return strlen(str);
|
|
}
|
|
|
|
int snprintf(char* str, size_t n, const char* fmt, ...) {
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
|
|
char* buffer = _format(fmt, args);
|
|
strncpy(str, buffer, n);
|
|
free(buffer);
|
|
va_end(args);
|
|
|
|
return strlen(str);
|
|
}
|
|
|
|
int fprintf(FILE* stream, const char* fmt, ...) {
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
|
|
char* buffer = _format(fmt, args);
|
|
size_t len = strlen(buffer);
|
|
write(stream->_file, buffer, len); // TODO: use fwrite()
|
|
|
|
free(buffer);
|
|
va_end(args);
|
|
return len;
|
|
}
|
|
|
|
int printf(const char* fmt, ...) {
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
|
|
char* buffer = _format(fmt, args);
|
|
size_t len = strlen(buffer);
|
|
write(stdout->_file, buffer, len); // TODO: use fwrite()
|
|
|
|
free(buffer);
|
|
va_end(args);
|
|
return len;
|
|
}
|
|
|
|
void print(const char* s) {
|
|
write(1, s, strlen(s));
|
|
}
|
|
|