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Improved printf()

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Tom-on
2024-08-27 15:17:42 +02:00
parent f79603c778
commit b88f84b4cd
3 changed files with 120 additions and 70 deletions
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include/c/_printf.h
+103 -49
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@@ -1,75 +1,129 @@
#ifndef _PRINTF_H
#define _PRINTF_H
#include <syscall.h>
#include <string.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdarg.h>
#include <_fileio.h>
// TODO: Support negative numbers
int printf(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
// Printing buffer
// Warning: returns a allocated buffer, must be freed!
char* _format(const char* fmt, va_list args) {
static char* buffer;
static unsigned int len;
int max = 256;
size_t len = 0;
size_t max = 256;
buffer = malloc(max);
len = 0;
int state = 0;
for (int i = 0; fmt[i] != '\0'; i++) {
size_t i = 0;
while (fmt[i] != '\0') {
if (len > max) {
max *= 2;
// Reallocate larger buffer TODO: Use realloc();
// Reallocate a larger buffer
char* temp = malloc(max);
strcpy(temp, buffer);
free(buffer);
buffer = temp;
}
buffer[len] = '\0';
char c = fmt[i];
if (state == 0) {
if (c == '%') state = '%';
else buffer[len++] = c;
} else if (state == '%') {
switch (c) {
case 'd': // Decimal number
strcat(buffer, itoa(va_arg(args, int), 10));
len += strlen(&buffer[len]); // Add the remaining length
break;
case 'x': // Hex number
strcat(buffer, itoa(va_arg(args, int), 16));
len += strlen(&buffer[len]);
break;
case 's': // String
char* s = va_arg(args, char*);
while (*s != '\0') {
buffer[len++] = *s++;
}
break;
case 'c': // Char
buffer[len++] = va_arg(args, char);
break;
default: // This looks insane
buffer[len++] = '%';
case '%': // Just print '%'
buffer[len++] = c;
break;
}
state = 0;
}
// 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';
write(1, buffer, len);
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 0;
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;
}
#endif
kern.iso
BIN
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src/kernel.c
+17 -21
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@@ -88,7 +88,7 @@ void main() {
terminal->fg = FG_COLOR;
terminal->bg = BG_COLOR;
clear();
print("kern.\n\n");
printf("kern.\n\n");
// Run Interactive Shell Program
// TODO: Make it in another file
@@ -254,17 +254,13 @@ void main() {
}
putc('\n');
}
if (i < 0x10) printf("0");
if (i < 0x100) printf("0");
if (i < 0x1000) printf("0");
printf("%x: ", i);
printf("%04x: ", i);
}
if (fp->_ptr[i] < 0x10) putc('0');
printf("%x ", fp->_ptr[i]);
printf("%02x ", fp->_ptr[i]);
}
if (fp->_size % 32 != 0) {
for (size_t i = 0; i < 32-(fp->_size % 32); i++) {
printf("00 ");
printf(" ");
}
}
printf(" ");
@@ -314,35 +310,35 @@ void printRegs() {
// a, b, c, d
__asm__ volatile ("movl %%eax, %0" : "=r"(val));
printf("eax 0x%x\n", val);
printf("eax 0x%08x\n", val);
__asm__ volatile ("movl %%ebx, %0" : "=r"(val));
printf("ebx 0x%x\n", val);
printf("ebx 0x%08x\n", val);
__asm__ volatile ("movl %%ecx, %0" : "=r"(val));
printf("ecx 0x%x\n", val);
printf("ecx 0x%08x\n", val);
__asm__ volatile ("movl %%edx, %0" : "=r"(val));
printf("edx 0x%x\n", val);
printf("edx 0x%08x\n", val);
// si, di
__asm__ volatile ("movl %%esi, %0" : "=r"(val));
printf("esi 0x%x\n", val);
printf("esi 0x%08x\n", val);
__asm__ volatile ("movl %%edi, %0" : "=r"(val));
printf("edi 0x%x\n", val);
printf("edi 0x%08x\n", val);
// cs, ds, es, ss
__asm__ volatile ("movl %%cs, %0" : "=r"(val));
printf("cs 0x%x\n", val);
printf("cs 0x%08x\n", val);
__asm__ volatile ("movl %%ds, %0" : "=r"(val));
printf("ds 0x%x\n", val);
printf("ds 0x%08x\n", val);
__asm__ volatile ("movl %%es, %0" : "=r"(val));
printf("es 0x%x\n", val);
printf("es 0x%08x\n", val);
__asm__ volatile ("movl %%ss, %0" : "=r"(val));
printf("ss 0x%x\n", val);
printf("ss 0x%08x\n", val);
// stack
__asm__ volatile ("movl %%esp, %0" : "=r"(val));
printf("esp 0x%x\n", val);
printf("esp 0x%08x\n", val);
__asm__ volatile ("movl %%ebp, %0" : "=r"(val));
printf("ebp 0x%x\n", val);
printf("ebp 0x%08x\n", val);
}
void printPhysicalMemmap() {
@@ -350,7 +346,7 @@ void printPhysicalMemmap() {
smapEntry_t* smapEntry = (smapEntry_t*)SMAP_ENTRIES;
for (uint32_t i = 0; i < entryCount; i++) {
printf("Region %d - base: 0x%x length: 0x%x type: %d ", i, (uint32_t)smapEntry->baseAddress, (uint32_t)smapEntry->length, smapEntry->type);
printf("Region %02d - base: 0x%08x length: 0x%08x type: %2d ", i, (uint32_t)smapEntry->baseAddress, (uint32_t)smapEntry->length, smapEntry->type);
switch (smapEntry->type) {
case 1: printf("(Available)\n"); break;