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5 * All or some portions of this file are derived from material licensed
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94
35 * $FreeBSD: src/lib/libstand/printf.c,v 1.14 2010/07/12 15:32:45 jkim Exp $
39 * Standaloneified version of the FreeBSD kernel printf family.
42 #include <sys/types.h>
43 #include <sys/stdint.h>
49 * Note that stdarg.h and the ANSI style va_start macro is used for both
50 * ANSI and traditional C compilers.
59 #define MAXNBUF (sizeof(intmax_t) * CHAR_BIT + 1)
61 static char *ksprintn (char *buf, uintmax_t num, int base, int *len, int upper);
62 static int kvprintf(const char *, void (*)(int, void *), void *, int,
64 static void putchar_wrapper(int, void *);
65 static void snprintf_func(int, void *);
68 putchar_wrapper(int ch, void *arg __unused)
74 printf(const char *fmt, ...)
80 retval = kvprintf(fmt, putchar_wrapper, NULL, 10, ap);
86 vprintf(const char *fmt, va_list ap)
89 kvprintf(fmt, putchar_wrapper, NULL, 10, ap);
93 sprintf(char *buf, const char *cfmt, ...)
99 retval = kvprintf(cfmt, NULL, buf, 10, ap);
106 vsprintf(char *buf, const char *cfmt, va_list ap)
110 retval = kvprintf(cfmt, NULL, buf, 10, ap);
115 snprintf(char *buf, size_t size, const char *cfmt, ...)
121 retval = vsnprintf(buf, size, cfmt, ap);
127 vsnprintf(char *buf, size_t size, const char *cfmt, va_list ap)
129 struct snprintf_arg info;
134 retval = kvprintf(cfmt, snprintf_func, &info, 10, ap);
135 if (info.remain >= 1)
141 snprintf_func(int ch, void *arg)
143 struct snprintf_arg * const info = arg;
145 if (info->remain >= 2) {
152 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
153 * order; return an optional length and a pointer to the last character
154 * written in the buffer (i.e., the first character of the string).
155 * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
158 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
165 c = hex2ascii(num % base);
166 *++p = upper ? toupper(c) : c;
167 } while (num /= base);
174 * Scaled down version of printf(3).
176 * Two additional formats:
178 * The format %b is supported to decode error registers.
181 * printf("reg=%b\n", regval, "<base><arg>*");
183 * where <base> is the output base expressed as a control character, e.g.
184 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
185 * the first of which gives the bit number to be inspected (origin 1), and
186 * the next characters (up to a control character, i.e. a character <= 32),
187 * give the name of the register. Thus:
189 * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
191 * would produce output:
193 * reg=3<BITTWO,BITONE>
197 kvprintf(char const *fmt, void (*func)(int, void *), void *arg, int radix,
200 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc, arg); else *d++ = cc; retval++; }
203 const char *p, *percent, *q;
206 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
207 int cflag, hflag, jflag, tflag, zflag;
210 int stop = 0, retval = 0;
219 fmt = "(fmt null)\n";
221 if (radix < 2 || radix > 36)
227 while ((ch = (u_char)*fmt++) != '%' || stop) {
233 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
234 sign = 0; dot = 0; dwidth = 0; upper = 0;
235 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
237 reswitch: switch (ch = (u_char)*fmt++) {
255 width = va_arg(ap, int);
261 dwidth = va_arg(ap, int);
269 case '1': case '2': case '3': case '4':
270 case '5': case '6': case '7': case '8': case '9':
271 for (n = 0;; ++fmt) {
272 n = n * 10 + ch - '0';
274 if (ch < '0' || ch > '9')
283 num = (u_int)va_arg(ap, int);
284 p = va_arg(ap, char *);
285 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
293 if (num & (1 << (n - 1))) {
294 PCHAR(tmp ? ',' : '<');
295 for (; (n = *p) > ' '; ++p)
299 for (; *p > ' '; ++p)
306 PCHAR(va_arg(ap, int));
332 *(va_arg(ap, intmax_t *)) = retval;
334 *(va_arg(ap, quad_t *)) = retval;
336 *(va_arg(ap, long *)) = retval;
338 *(va_arg(ap, size_t *)) = retval;
340 *(va_arg(ap, short *)) = retval;
342 *(va_arg(ap, char *)) = retval;
344 *(va_arg(ap, int *)) = retval;
351 sharpflag = (width == 0);
353 num = (uintptr_t)va_arg(ap, void *);
364 p = va_arg(ap, char *);
370 for (n = 0; n < dwidth && p[n]; n++)
375 if (!ladjust && width > 0)
380 if (ladjust && width > 0)
405 num = va_arg(ap, uintmax_t);
407 num = va_arg(ap, u_quad_t);
409 num = va_arg(ap, ptrdiff_t);
411 num = va_arg(ap, u_long);
413 num = va_arg(ap, size_t);
415 num = (u_short)va_arg(ap, int);
417 num = (u_char)va_arg(ap, int);
419 num = va_arg(ap, u_int);
423 num = va_arg(ap, intmax_t);
425 num = va_arg(ap, quad_t);
427 num = va_arg(ap, ptrdiff_t);
429 num = va_arg(ap, long);
431 num = va_arg(ap, ssize_t);
433 num = (short)va_arg(ap, int);
435 num = (char)va_arg(ap, int);
437 num = va_arg(ap, int);
439 if (sign && (intmax_t)num < 0) {
441 num = -(intmax_t)num;
443 p = ksprintn(nbuf, num, base, &n, upper);
445 if (sharpflag && num != 0) {
454 if (!ladjust && padc == '0')
455 dwidth = width - tmp;
456 width -= tmp + imax(dwidth, n);
463 if (sharpflag && num != 0) {
466 } else if (base == 16) {
483 while (percent < fmt)
486 * Since we ignore an formatting argument it is no
487 * longer safe to obey the remaining formatting
488 * arguments as the arguments will no longer match