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conio_cprintf.c
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conio_cprintf.c
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#include "conio.h"
#include "string.h"
char conio_sprintfbuf[256];
// helper function to put the string out - string will be modified and is
// expected to be 256 chars in length
int fmt_print(char *s, int zero, int width, int left, int precis, int plus) {
int cnt = 0;
int i = strlen(s);
int pad = ' ';
if (zero) pad = '0';
if ((precis > 0) && (i >= precis)) {
i = precis;
if (plus) --i;
}
if ((plus) && (width > 0)) --width;
if (width <= 0) {
if (plus) {
cputc('+');
++cnt;
}
for (int idx=0; idx<i; ++idx) {
cputc(*(s++));
++cnt;
}
} else {
if (left) {
if (plus) {
cputc('+');
++cnt;
}
for (int idx=0; idx<i; ++idx) {
cputc(*(s++));
++cnt;
}
for (int idx=0; idx<width-i; ++idx) {
cputc(' ');
++cnt;
}
} else {
if ((plus)&&(zero)) {
cputc('+');
plus = 0;
++cnt;
}
for (int idx=0; idx<width-i; ++idx) {
cputc(pad);
++cnt;
}
if (plus) {
cputc('+');
++cnt;
}
for (int idx=0; idx<i; ++idx) {
cputc(*(s++));
++cnt;
}
}
}
return cnt;
}
// somewhat standardish printf.
// no floats today
int cprintf(const char *fmt, ...) {
int i=0;
unsigned int u=0;
char *s=0;
int cnt = 0;
va_list argp;
va_start(argp, fmt);
while (*fmt) {
if (*fmt != '%') {
cputc(*fmt);
} else {
++fmt;
int zero = 0;
int width = 0;
int left = 0;
int plus = 0;
int ucase = 0;
int precis = 0;
int done = 0;
while (!done) {
switch (*fmt) {
case '-': left = 1; break;
case '+': plus = 1; break;
case '.': precis = -1; break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (precis) {
if (precis == -1) {
precis = (*fmt)-'0';
} else {
precis = (precis*10) + ((*fmt)-'0');
}
} else {
if (width == 0) {
if (*fmt == '0') {
// this i a zero pad specifier
zero=1;
} else {
width = (*fmt)-'0';
}
} else {
width = (width*10) + ((*fmt)-'0');
}
}
break;
case 'c': // char
i = va_arg(argp, int);
conio_sprintfbuf[0]=i;
conio_sprintfbuf[1]='\0';
cnt += fmt_print(conio_sprintfbuf, 0, width, left, precis, 0);
done = 1;
break;
case 'i': // decimal
case 'd': // decimal
i = va_arg(argp, int);
s = int2str(i);
strcpy(conio_sprintfbuf, s);
cnt += fmt_print(conio_sprintfbuf, zero, width, left, precis, plus);
done = 1;
break;
case 'u': // unsigned decimal
u = va_arg(argp, unsigned int);
s = uint2str(u);
strcpy(conio_sprintfbuf, s);
cnt += fmt_print(conio_sprintfbuf, zero, width, left, precis, plus);
done = 1;
break;
case 's': // string
s = va_arg(argp, char*);
cnt += fmt_print(s, 0, width, left, precis, 0);
done = 1;
break;
case 'X': // uppercase hex
ucase = 1;
// fall through
case 'x': // hex (a little inefficient..)
u = va_arg(argp, unsigned int);
i = (u&0xf000)>>12;
if (i>9) i+=7;
conio_sprintfbuf[0]=i+'0';
i = (u&0xf00)>>8;
if (i>9) i+=7;
conio_sprintfbuf[1]=i+'0';
i = (u&0xf0)>>4;
if (i>9) i+=7;
conio_sprintfbuf[2]=i+'0';
i = (u&0xf);
if (i>9) i+=7;
conio_sprintfbuf[3]=i+'0';
conio_sprintfbuf[4]='\0';
if (!zero) {
// remove leading zeros
while (conio_sprintfbuf[0]=='0') {
// my memcpy is safe in this direction only...
memcpy(&conio_sprintfbuf[0], &conio_sprintfbuf[1], 4); // includes NUL
}
if (conio_sprintfbuf[0] == '\0') {
conio_sprintfbuf[0]='0';
conio_sprintfbuf[1]='\0';
}
}
if (!ucase) {
// make lowercase
for (int idx=0; idx<4; ++idx) {
if ((conio_sprintfbuf[idx]>='A')&&(conio_sprintfbuf[idx]<='F')) {
conio_sprintfbuf[idx]+=32; // make lowercase
}
}
}
cnt += fmt_print(conio_sprintfbuf, 0, width, left, precis, 0);
done = 1;
break;
case 'o': // octal (roughly same as hex)
u = va_arg(argp, unsigned int);
i = (u&0x8000)>>15;
conio_sprintfbuf[0]=i+'0';
i = (u&0x7000)>>12;
conio_sprintfbuf[1]=i+'0';
i = (u&0x0e00)>>9;
conio_sprintfbuf[2]=i+'0';
i = (u&0x01c0)>>6;
conio_sprintfbuf[3]=i+'0';
i = (u&0x0038)>>3;
conio_sprintfbuf[4]=i+'0';
i = (u&0x0007);
conio_sprintfbuf[5]=i+'0';
conio_sprintfbuf[6]='\0';
if (!zero) {
// remove leading zeros
while (conio_sprintfbuf[0]=='0') {
// my memcpy is safe in this direction only...
memcpy(&conio_sprintfbuf[0], &conio_sprintfbuf[1], 6); // includes NUL
}
if (conio_sprintfbuf[0] == '\0') {
conio_sprintfbuf[0]='0';
conio_sprintfbuf[1]='\0';
}
}
cnt += fmt_print(conio_sprintfbuf, 0, width, left, precis, 0);
done = 1;
break;
case '%': // percent sign
cputc('%');
++cnt;
done = 1;
break;
// probably useful...
//case 'e': // exp float (no support)
//case 'f': // float (no support)
case '\0':
// error - end of string
--fmt;
break;
default:
cputc(*fmt);
++cnt;
done = 1;
break;
}
++fmt;
}
--fmt; // make up for the extra increment
}
++fmt;
}
return cnt;
}