static char log_buf[1024];
static char store[20];
int pos = 0;
char *itoa(int num, char *str, int radix) ;
char *itoa(int num, char *str, int radix)
{
char string[] = "0123456789abcdefghijklmnopqrstuvwxyz";
char* ptr = str;
int i = 0;
int j = 0;
int k = 0;
if(num == 0)
{
str[0]='0';
str[1]=0;
return str;
}
while (num)
{
k = num -(num/radix)*radix;
*ptr++ = string[k];
num /= radix;
if (num < radix)
{
*ptr++ = string[num];
*ptr = '\0';
break;
}
}
j = ptr - str - 1;
//exchange number sequence
for (i = 0; i < (ptr - str) / 2; i++)
{
int temp = str[i];
str[i] = str[j];
str[j--] = temp;
}
return str;
}
unsigned long printf(
void *pbUserData, /* User data passed to all porting routines */
const char *aFormat,...) /* aFormat string to printf */
{
char* pArg=NULL;
char c;
pos = 0;
pArg = (char*) &aFormat;;
pArg += sizeof(aFormat);
/// va_list arg;
int done = 0;
char* str = NULL;
int i = 0;
int align_len = 0;
int data_len = 0;
// va_start (arg, aFormat);
while( *aFormat != '\0')
{
if( *aFormat == '%')
{
if( *(aFormat+1) == '0' || *(aFormat+1) == 'f')
{
aFormat ++;
c = *(aFormat+1); //only support one digital length control
if(*(aFormat +2) != 'x')
return -1;
switch (c) {
case '1':
align_len = 1;
break;
case '2':
align_len = 2;
break;
case '3':
align_len = 3;
break;
case '4':
align_len = 4;
break;
case '5':
align_len = 5;
break;
case '6':
align_len = 6;
break;
case '7':
align_len = 7;
break;
case '8':
align_len = 8;
break;
case '9':
align_len = 9;
break;
default:
align_len = 0;
break;
}
//i = va_arg(arg, int);
i = *((int*)pArg);
str = store;
itoa(i, store, 16);
data_len = 0;
while(*(str)!= 0)
{
str ++;
data_len ++;
}
//patch zero
if(align_len > data_len && *aFormat=='0')
{
for(i=0; i<(align_len - data_len); i++)
{
log_buf[pos++]='0';
}
}
//patch space
if(align_len > data_len && *aFormat=='f')
{
for(i=0; i<(align_len - data_len); i++)
{
log_buf[pos++]=' ';
}
}
str = store;
while(*str != 0)
{
log_buf[pos++]= *str;
str ++;
}
aFormat +=3;
//point to next param
pArg += sizeof(int);
continue;
}
if( *(aFormat+1) == 'c' )
{
//char c = (char)va_arg(arg, int);
char c = *((char*)pArg);
log_buf[pos++] = c;
aFormat += 2;
//point to next param
pArg += sizeof(int);
continue;
}
else if( *(aFormat+1) == 'd')
{
//i = va_arg(arg, int);
i = *((int*)pArg);
str = store;
itoa(i, store, 10);
while( *str != '\0'){
log_buf[pos++] = *str;
str ++;
}
aFormat += 2;
//point to next param
pArg += sizeof(int);
continue;
}
else if(*(aFormat+1) == 'u')
{
//i = va_arg(arg, int);
i = *((int*)pArg);
str = store;
itoa(i, store, 10);
while( *str != '\0'){
log_buf[pos++] = *str;
str ++;
}
aFormat += 2;
//point to next param
pArg += sizeof(int);
continue;
}
else if( *(aFormat+1) == 'o')
{
//i = va_arg(arg, int);
i = *((int*)pArg);
str = store;
itoa(i, store, 8);
while( *str != '\0'){
log_buf[pos++] = *str;
str ++;
}
aFormat +=2;
//point to next param
pArg += sizeof(int);
continue;
}
else if( *(aFormat+1) == 'x')
{
//i = va_arg(arg, int);
i = *((int*)pArg);
str = store;
itoa(i, store, 16);
while( *str != '\0'){
log_buf[pos++] = *str;
str ++;
}
aFormat += 2;
//point to next param
pArg += sizeof(int);
continue;
}
else if( *(aFormat+1) == 's' )
{
//str = va_arg(arg, char*);
str = *((int*)pArg);
while( *str != '\0'){
log_buf[pos++] = *str;
str ++;
}
aFormat += 2;
//point to next param
pArg += sizeof(int);
continue;
}
else if( *(aFormat+1) == '%' )
{
log_buf[pos++] = '%';
aFormat += 2;
//point to next param
pArg += sizeof(int);
continue;
}
} else {
log_buf[pos++] = *(aFormat ++);
}
}
log_buf[pos] = 0;
UartPrint(log_buf); //change your uart send string data function.
return 0;
}
Usage:
printf(NULL, "test %d.\r\n", 10);
printf(NULL, "test %x.\r\n", 0x55);
printf(NULL, "test %s.\r\n", "%s");
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