417 lines
8.6 KiB
C++
417 lines
8.6 KiB
C++
#include "ustringformat.h"
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/* Blatantly stolen from FREEBSD. */
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typedef uint64 uintmax_t;
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typedef int64 intmax_t;
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typedef uint64 u_quad_t;
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typedef int64 quad_t;
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char* ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
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{
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char *p = nbuf;
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*p = '\0';
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do
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{
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*++p = upper ? hex2asciiupper(num % base) : hex2ascii(num % base);
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} while (num /= base);
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if (lenp)
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*lenp = p - nbuf;
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return (p);
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}
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int kvprintf(char const *fmt, void (*func)(int,void*), void *arg, int radix, va_list ap)
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{
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#define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
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char nbuf[MAXNBUF];
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char *d;
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const char *p, *percent, *q;
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u_char *up;
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int ch, n;
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uintmax_t num;
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int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
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int cflag, hflag, jflag, tflag, zflag;
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int dwidth, upper;
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char padc;
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int stop = 0, retval = 0;
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num = 0;
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if (!func)
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d = (char *) arg;
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else
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d = NULL;
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if (fmt == NULL)
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fmt = "(fmt null)\n";
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if (radix < 2 || radix > 36)
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radix = 10;
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for (;;)
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{
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padc = ' ';
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width = 0;
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while ((ch = (u_char) *fmt++) != '%' || stop)
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{
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if (ch == '\0')
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return (retval);
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PCHAR(ch);
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}
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percent = fmt - 1;
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qflag = 0;
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lflag = 0;
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ladjust = 0;
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sharpflag = 0;
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neg = 0;
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sign = 0;
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dot = 0;
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dwidth = 0;
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upper = 0;
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cflag = 0;
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hflag = 0;
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jflag = 0;
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tflag = 0;
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zflag = 0;
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reswitch: switch (ch = (u_char) *fmt++)
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{
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case '.':
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dot = 1;
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goto reswitch;
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case '#':
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sharpflag = 1;
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goto reswitch;
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case '+':
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sign = 1;
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goto reswitch;
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case '-':
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ladjust = 1;
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goto reswitch;
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case '%':
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PCHAR(ch)
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;
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break;
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case '*':
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if (!dot)
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{
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width = va_arg(ap, int);
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if (width < 0)
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{
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ladjust = !ladjust;
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width = -width;
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}
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}
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else
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{
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dwidth = va_arg(ap, int);
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}
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goto reswitch;
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case '0':
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if (!dot)
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{
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padc = '0';
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goto reswitch;
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}
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// fall-through
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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for (n = 0;; ++fmt)
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{
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n = n * 10 + ch - '0';
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ch = *fmt;
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if (ch < '0' || ch > '9')
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break;
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}
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if (dot)
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dwidth = n;
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else
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width = n;
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goto reswitch;
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case 'b':
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num = (u_int) va_arg(ap, int);
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p = va_arg(ap, char *);
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for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
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PCHAR(*q--)
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;
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if (num == 0)
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break;
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for (tmp = 0; *p;)
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{
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n = *p++;
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if (num & (1 << (n - 1)))
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{
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PCHAR(tmp ? ',' : '<');
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for (; (n = *p) > ' '; ++p)
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PCHAR(n);
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tmp = 1;
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}
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else
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for (; *p > ' '; ++p)
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continue;
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}
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if (tmp)
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PCHAR('>')
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;
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break;
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case 'c':
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PCHAR(va_arg(ap, int))
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;
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break;
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case 'D':
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up = va_arg(ap, u_char *);
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p = va_arg(ap, char *);
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if (!width)
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width = 16;
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while (width--)
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{
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PCHAR(hex2ascii(*up >> 4));
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PCHAR(hex2ascii(*up & 0x0f));
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up++;
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if (width)
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for (q = p; *q; q++)
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PCHAR(*q);
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}
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break;
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case 'd':
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case 'i':
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base = 10;
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sign = 1;
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goto handle_sign;
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case 'h':
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if (hflag)
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{
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hflag = 0;
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cflag = 1;
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}
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else
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hflag = 1;
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goto reswitch;
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case 'j':
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jflag = 1;
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goto reswitch;
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case 'l':
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if (lflag)
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{
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lflag = 0;
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qflag = 1;
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}
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else
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lflag = 1;
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goto reswitch;
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case 'n':
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if (jflag)
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*(va_arg(ap, intmax_t *)) = retval;
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else if (qflag)
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*(va_arg(ap, quad_t *)) = retval;
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else if (lflag)
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*(va_arg(ap, long *)) = retval;
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else if (zflag)
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*(va_arg(ap, size_t *)) = retval;
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else if (hflag)
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*(va_arg(ap, short *)) = retval;
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else if (cflag)
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*(va_arg(ap, char *)) = retval;
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else
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*(va_arg(ap, int *)) = retval;
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break;
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case 'o':
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base = 8;
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goto handle_nosign;
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case 'p':
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base = 16;
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sharpflag = (width == 0);
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sign = 0;
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num = (uintptr_t) va_arg(ap, void *);
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goto number;
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case 'q':
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qflag = 1;
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goto reswitch;
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case 'r':
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base = radix;
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if (sign)
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goto handle_sign;
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goto handle_nosign;
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case 's':
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p = va_arg(ap, char *);
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if (p == NULL)
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p = "(null)";
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if (!dot)
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n = strlen(p);
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else
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for (n = 0; n < dwidth && p[n]; n++)
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continue;
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width -= n;
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if (!ladjust && width > 0)
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while (width--)
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PCHAR(padc)
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;
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while (n--)
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PCHAR(*p++)
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;
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if (ladjust && width > 0)
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while (width--)
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PCHAR(padc)
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;
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break;
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case 't':
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tflag = 1;
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goto reswitch;
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case 'u':
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base = 10;
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goto handle_nosign;
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case 'X':
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upper = 1;
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// fall-through
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case 'x':
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sharpflag = 1;
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base = 16;
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goto handle_nosign;
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case 'y':
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base = 16;
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sign = 1;
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goto handle_sign;
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case 'z':
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zflag = 1;
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goto reswitch;
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handle_nosign: sign = 0;
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if (jflag)
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num = va_arg(ap, uintmax_t);
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else if (qflag)
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num = va_arg(ap, u_quad_t);
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else if (tflag)
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num = va_arg(ap, ptrdiff_t);
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else if (lflag)
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num = va_arg(ap, u_long);
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else if (zflag)
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num = va_arg(ap, size_t);
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else if (hflag)
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num = (u_short) va_arg(ap, int);
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else if (cflag)
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num = (u_char) va_arg(ap, int);
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else
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num = va_arg(ap, u_int);
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goto number;
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handle_sign: if (jflag)
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num = va_arg(ap, intmax_t);
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else if (qflag)
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num = va_arg(ap, quad_t);
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else if (tflag)
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num = va_arg(ap, ptrdiff_t);
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else if (lflag)
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num = va_arg(ap, long);
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else if (zflag)
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num = va_arg(ap, ssize_t);
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else if (hflag)
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num = (short) va_arg(ap, int);
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else if (cflag)
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num = (char) va_arg(ap, int);
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else
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num = va_arg(ap, int);
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number: if (sign && (intmax_t) num < 0)
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{
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neg = 1;
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num = -(intmax_t) num;
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}
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p = ksprintn(nbuf, num, base, &n, upper);
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tmp = 0;
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if (sharpflag && num != 0)
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{
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if (base == 8)
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tmp++;
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else if (base == 16)
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tmp += 2;
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}
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if (neg)
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tmp++;
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if (!ladjust && padc == '0')
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dwidth = width - tmp;
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width -= tmp + Max(dwidth, n);
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dwidth -= n;
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if (!ladjust)
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while (width-- > 0)
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PCHAR(' ')
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;
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if (neg)
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PCHAR('-')
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;
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if (sharpflag && num != 0)
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{
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if (base == 8)
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{
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PCHAR('0');
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}
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else if (base == 16)
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{
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PCHAR('0');
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PCHAR('x');
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}
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}
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while (dwidth-- > 0)
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PCHAR('0')
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;
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while (*p)
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PCHAR(*p--)
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;
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if (ladjust)
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while (width-- > 0)
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PCHAR(' ')
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;
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break;
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default:
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while (percent < fmt)
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PCHAR(*percent++)
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;
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/*
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* Since we ignore an formatting argument it is no
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* longer safe to obey the remaining formatting
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* arguments as the arguments will no longer match
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* the format specs.
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*/
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stop = 1;
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break;
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}
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}
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#undef PCHAR
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}
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void snprintf_func(int ch, void *arg)
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{
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snprintf_arg * info = (snprintf_arg* ) arg;
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if (info->remain >= 2)
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{
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*info->str++ = ch;
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info->remain--;
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}
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}
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/*
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* Scaled down version of vsnprintf(3).
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*/
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int vsnprintf(char *str, size_t size, const char *format, va_list ap)
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{
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snprintf_arg info;
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int retval;
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info.str = str;
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info.remain = size;
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retval = kvprintf(format, snprintf_func, &info, 10, ap);
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if (info.remain >= 1)
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*info.str++ = '\0';
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return retval;
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}
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