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Some printf() bug fixes

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Tom-on
2024-05-29 12:00:02 +02:00
parent ed18f4ac4b
commit f4e8435603
2 changed files with 6 additions and 7 deletions
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include/c/stdio.h
+6 -6
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@@ -27,7 +27,7 @@ void clear() {
// TODO: Support negative numbers
// TODO: Printing individual characters doesn't let escape sequences work :(
int printf(const char* fmt, ...) {
char* argPtr = (char*)&fmt + sizeof(char*); // First arg after fmt
uint32_t* argPtr = (uint32_t*)&fmt + 1; // First arg after fmt
uint8_t state = 0;
for (uint32_t i = 0; fmt[i] != '\0'; i++) {
@@ -40,22 +40,22 @@ int printf(const char* fmt, ...) {
switch (c) {
case 'd': // Decimal number
print(itoa(*(uint32_t*)argPtr, 10));
argPtr += sizeof(unsigned int);
argPtr++;
break;
case 'x': // Hex number
print(itoa(*(uint32_t*)argPtr, 16));
argPtr += sizeof(unsigned int);
argPtr++;;
break;
case 's': // String
print(*(char**)argPtr);
argPtr += sizeof(char*);
argPtr++;
break;
case 'c': // Char
putc(*(char*)argPtr);
argPtr += sizeof(char);
argPtr++;
break;
case '%': // Just print '%'
putc('%');
putc(c);
break;
default:
putc('%');