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#include <inttypes.h>
#include <ctype.h>
#include <string.h>
#include "_conversion.h"
/*
struct io_conversion {
enum { IO_IN, IO_OUT } dir;
enum {
F_STAR = (1<<0),
F_LEFT = (1<<1),
F_SIGN = (1<<2),
F_SPACE = (1<<3),
F_ALT = (1<<4),
F_ZERO = (1<<4),
} flags;
enum {
L_default,
L_hh,
L_h,
L_l,
L_ll,
L_j,
L_z,
L_t,
L_L,
} length;
int has_width:1;
int has_precision:1;
uintmax_t width;
uintmax_t precision;
char spec;
};
*/
size_t __conv(const char *format, struct io_conversion *conv)
{
size_t ret = 0;
if (format[0] != '%') {
return 0;
}
ret++;
conv->flags = 0;
conv->length = L_default;
conv->has_width = 0;
conv->has_precision = 0;
while (strchr("*-+ #0", format[ret])) {
switch (format[ret]) {
case '*': conv->flags |= F_STAR; break;
case '-': conv->flags |= F_LEFT; break;
case '+': conv->flags |= F_SIGN; break;
case ' ': conv->flags |= F_SPACE; break;
case '#': conv->flags |= F_ALT; break;
case '0': conv->flags |= F_ZERO; break;
}
/* check for invalid input flags (only * is allowed) */
ret++;
}
if (isdigit(format[ret])) {
char *end = NULL;
conv->has_width = 1;
conv->width = strtoumax(format + ret, &end, 10);
ret += (size_t)(end - (format + ret));
}
/* TODO: precision */
if (strchr("hljztL", format[ret])) {
switch (format[ret]) {
case 'h':
if (format[ret + 1] == 'h') {
ret++;
conv->length = L_hh;
} else {
conv->length = L_h;
}
break;
case 'l':
if (format[ret + 1] == 'l') {
ret++;
conv->length = L_ll;
} else {
conv->length = L_l;
}
break;
case 'j':
conv->length = L_j;
break;
case 'z':
conv->length = L_z;
break;
case 't':
conv->length = L_t;
break;
case 'L':
conv->length = L_L;
break;
default:
break;
}
ret++;
}
/* TODO: validate */
conv->spec = format[ret];
ret++;
return ret;
}
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