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#include "internal_vsnprintf.c"
#include <inttypes.h>
int vsnprintf_s(char * restrict s, rsize_t n, const char * restrict format, va_list arg)
{
__C_EXT(1, 201112L);
int nout = 0;
intmax_t argint = 0;
void *argptr = NULL;
char numbuf[NUMBUFLEN];
for (size_t i = 0; format[i] != 0; i++) {
if (format[i] != '%') {
if (nout < (int)n) {
s[nout] = format[i];
}
nout++;
continue;
}
//__asm int 3;
// zero of more flags "-+ #0"
// optional width "*" or decimal integer
// optional precision ".*" or ".[decimal]"
// optional length modifier "hh", "h", "l", "ll", "j",
// "z", "t", "L"
// conversion specifier "diouxXfFeEgGaAcspn%"
int flags = 0;
uintmax_t width = 0;
int step = 0;
int precision = 0;
int base = 10;
enum { def, hh, h, l, ll, j, z, t, L } length = def;
while (step == 0) {
i++;
switch (format[i]) {
case '-': flags |= LEFT; break;
case '+': flags |= SIGN; break;
case ' ': flags |= SPACE; break;
case '#': flags |= ALT; break;
case '0': flags |= ZERO; break;
default: step = 1; break;
}
}
if (format[i] == '*') {
i++;
} else if (isdigit(format[i])) {
char *end;
width = strtoumax(format + i, &end, 10);
i = end - format;
}
if (format[i] == '.') {
i++;
if (format[i] == '*') {
i++;
} else if (isdigit(format[i])) {
char *end;
precision = (int)strtoumax(format + i, &end, 10);
i = end - format;
} else {
// invalid precision
return -nout;
}
}
if (format[i] == 'h') {
i++;
if (format[i] == 'h') {
i++;
length = hh;
} else {
length = h;
}
} else if (format[i] == 'l') {
i++;
if (format[i] == 'l') {
i++;
length = ll;
} else {
length = l;
}
} else if (format[i] == 'j') {
i++;
length = j;
} else if (format[i] == 'z') {
i++;
length = z;
} else if (format[i] == 't') {
i++;
length = t;
} else if (format[i] == 'L') {
i++;
length = L;
}
if (isupper(format[i])) {
flags |= UPPER;
}
switch (format[i]) {
case 'o': // unsigned int
case 'u':
case 'x':
case 'X':
flags |= UNSIGNED;
case 'd': // int
case 'i':
switch (length) {
case hh: argint = (signed char)va_arg(arg, int); break;
case h: argint = (short int)va_arg(arg, int); break;
case l: argint = va_arg(arg, long int); break;
case ll: argint = va_arg(arg, long long int); break;
case j: argint = va_arg(arg, intmax_t); break;
case z: argint = va_arg(arg, size_t); break;
case t: argint = va_arg(arg, ptrdiff_t); break;
case L: return -nout;
default: argint = va_arg(arg, int); break;
}
if (format[i] == 'o') {
base = 8;
} else if (format[i] == 'x') {
base = 16;
} else if (format[i] == 'X') {
base = 16;
flags |= UPPER;
} else {
base = 10;
}
itos(numbuf, (long int)argint, flags, precision, base);
nout = append(s, numbuf, nout, n);
break;
case 'f': // double [-]ddd.ddd
case 'F':
break;
case 'e': // double [-]d.ddde+/-dd
case 'E':
break;
case 'g': // double f or e see docs
case 'G':
break;
case 'a': // double as hex
case 'A':
break;
case 'c': // char
if (length == def) {
char c = va_arg(arg, int);
if (nout < (int)n) {
s[nout] = c;
}
nout++;
} else if (length == l) {
//wint_t wc = va_arg(arg, wint_t);
//char mb[MB_CUR_MAX + 1] = "WC";
//wctomb(mb, wc);
//nout = append(s, mb, nout, n);
} else {
return -nout;
}
break;
case 's': // string
if (length == def) {
char *string = va_arg(arg, char *);
nout = append(s, string, nout, n);
} else if (length == l) {
//wchar_t *ws = va_arg(arg, wchar_t *);
//char *mbs = malloc(wcslen(ws) * MB_CUR_MAX + 1);
//wcstombs(mbs, ws, wcslen(ws) * MB_CUR_MAX + 1);
//nout = append(s, mbs, nout, n);
//free(mbs);
nout = append(s, "WIDE STRING", nout, n);
} else {
return -nout;
}
break;
case 'p': // pointer
argptr = va_arg(arg, void *);
nout = append(s, "0x", nout, n);
itos(numbuf, (intptr_t)argptr, ZERO, sizeof(argptr) * 2, 16);
nout = append(s, numbuf, nout, n);
break;
case 'n': // write-back
break;
case '%': // literal '%'
if (nout < (int)n) {
s[nout] = '%';
}
nout++;
break;
default: // undefined
return -nout;
}
}
return nout;
}
/*
CEXT1(201112)
*/
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