/* $OpenBSD: subr_prf.c,v 1.32 2001/06/22 14:14:09 deraadt Exp $ */ /* $NetBSD: subr_prf.c,v 1.45 1997/10/24 18:14:25 chuck Exp $ */ /*- * Copyright (c) 1986, 1988, 1991, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * note that stdarg.h and the ansi style va_start macro is used for both * ansi and traditional c complers. * XXX: this requires that stdarg.h define: va_alist and va_dcl */ #include #ifdef KGDB #include #include #endif #ifdef DDB #include /* db_printf, db_putchar prototypes */ extern int db_radix; /* XXX: for non-standard '%r' format */ #endif #if defined(UVM) && defined(UVM_SWAP_ENCRYPT) extern int uvm_doswapencrypt; #endif /* * defines */ /* flags for kprintf */ #define TOCONS 0x01 /* to the console */ #define TOTTY 0x02 /* to the process' tty */ #define TOLOG 0x04 /* to the kernel message buffer */ #define TOBUFONLY 0x08 /* to the buffer (only) [for sprintf] */ #define TODDB 0x10 /* to ddb console */ /* max size buffer kprintf needs to print quad_t [size in base 8 + \0] */ #define KPRINTF_BUFSIZE (sizeof(quad_t) * NBBY / 3 + 2) /* * local prototypes */ static int kprintf __P((const char *, int, void *, char *, va_list)); static void putchar __P((int, int, struct tty *)); /* * globals */ struct tty *constty; /* pointer to console "window" tty */ int consintr = 1; /* ok to handle console interrupts? */ extern int log_open; /* subr_log: is /dev/klog open? */ const char *panicstr; /* arg to first call to panic (used as a flag to indicate that panic has already been called). */ #ifdef DDB /* * Enter ddb on panic. */ int db_panic = 1; /* * db_console controls if we can be able to enter ddb by a special key * combination (machine dependent). * If DDB_SAFE_CONSOLE is defined in the kernel configuration it allows * to break into console during boot. It's _really_ useful when debugging * some things in the kernel that can cause init(8) to crash. */ #ifdef DDB_SAFE_CONSOLE int db_console = 1; #else int db_console = 0; #endif #endif /* * v_putc: routine to putc on virtual console * * the v_putc pointer can be used to redirect the console cnputc elsewhere * [e.g. to a "virtual console"]. */ void (*v_putc) __P((int)) = cnputc; /* start with cnputc (normal cons) */ /* * functions */ /* * Partial support (the failure case) of the assertion facility * commonly found in userland. */ void __assert(t, f, l, e) const char *t, *f, *e; int l; { panic("kernel %sassertion \"%s\" failed: file \"%s\", line %d", t, e, f, l); } /* * tablefull: warn that a system table is full */ void tablefull(tab) const char *tab; { log(LOG_ERR, "%s: table is full\n", tab); } /* * panic: handle an unresolvable fatal error * * prints "panic: " and reboots. if called twice (i.e. recursive * call) we avoid trying to sync the disk and just reboot (to avoid * recursive panics). */ void #ifdef __STDC__ panic(const char *fmt, ...) #else panic(fmt, va_alist) char *fmt; va_dcl #endif { static char panicbuf[512]; int bootopt; va_list ap; bootopt = RB_AUTOBOOT | RB_DUMP; #if defined(UVM) && defined(UVM_SWAP_ENCRYPT) if (uvm_doswapencrypt) bootopt &= ~RB_DUMP; #endif va_start(ap, fmt); if (panicstr) bootopt |= RB_NOSYNC; else { vsprintf(panicbuf, fmt, ap); panicstr = panicbuf; } printf("panic: "); va_start(ap, fmt); vprintf(fmt, ap); printf("\n"); va_end(ap); #ifdef KGDB kgdb_panic(); #endif #ifdef KADB if (boothowto & RB_KDB) kdbpanic(); #endif #ifdef DDB if (db_panic) Debugger(); #endif boot(bootopt); } /* * kernel logging functions: log, logpri, addlog */ /* * log: write to the log buffer * * => will not sleep [so safe to call from interrupt] * => will log to console if /dev/klog isn't open */ void #ifdef __STDC__ log(int level, const char *fmt, ...) #else log(level, fmt, va_alist) int level; char *fmt; va_dcl #endif { register int s; va_list ap; s = splhigh(); logpri(level); /* log the level first */ va_start(ap, fmt); kprintf(fmt, TOLOG, NULL, NULL, ap); splx(s); va_end(ap); if (!log_open) { va_start(ap, fmt); kprintf(fmt, TOCONS, NULL, NULL, ap); va_end(ap); } logwakeup(); /* wake up anyone waiting for log msgs */ } /* * logpri: log the priority level to the klog */ void /* XXXCDC: should be static? */ logpri(level) int level; { char *p; char snbuf[KPRINTF_BUFSIZE]; putchar('<', TOLOG, NULL); sprintf(snbuf, "%d", level); for (p = snbuf ; *p ; p++) putchar(*p, TOLOG, NULL); putchar('>', TOLOG, NULL); } /* * addlog: add info to previous log message */ int #ifdef __STDC__ addlog(const char *fmt, ...) #else addlog(fmt, va_alist) char *fmt; va_dcl #endif { register int s; va_list ap; s = splhigh(); va_start(ap, fmt); kprintf(fmt, TOLOG, NULL, NULL, ap); splx(s); va_end(ap); if (!log_open) { va_start(ap, fmt); kprintf(fmt, TOCONS, NULL, NULL, ap); va_end(ap); } logwakeup(); return(0); } /* * putchar: print a single character on console or user terminal. * * => if console, then the last MSGBUFS chars are saved in msgbuf * for inspection later (e.g. dmesg/syslog) */ static void putchar(c, flags, tp) register int c; int flags; struct tty *tp; { extern int msgbufmapped; struct msgbuf *mbp; if (panicstr) constty = NULL; if ((flags & TOCONS) && tp == NULL && constty) { tp = constty; flags |= TOTTY; } if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 && (flags & TOCONS) && tp == constty) constty = NULL; if ((flags & TOLOG) && c != '\0' && c != '\r' && c != 0177 && msgbufmapped) { mbp = msgbufp; if (mbp->msg_magic != MSG_MAGIC) { /* Nothing we can do */ } mbp->msg_bufc[mbp->msg_bufx++] = c; mbp->msg_bufl = min(mbp->msg_bufl+1, mbp->msg_bufs); if (mbp->msg_bufx < 0 || mbp->msg_bufx >= mbp->msg_bufs) mbp->msg_bufx = 0; /* If the buffer is full, keep the most recent data. */ if (mbp->msg_bufr == mbp->msg_bufx) { if (++mbp->msg_bufr >= mbp->msg_bufs) mbp->msg_bufr = 0; } } if ((flags & TOCONS) && constty == NULL && c != '\0') (*v_putc)(c); #ifdef DDB if (flags & TODDB) db_putchar(c); #endif } /* * uprintf: print to the controlling tty of the current process * * => we may block if the tty queue is full * => no message is printed if the queue doesn't clear in a reasonable * time */ void #ifdef __STDC__ uprintf(const char *fmt, ...) #else uprintf(fmt, va_alist) char *fmt; va_dcl #endif { register struct proc *p = curproc; va_list ap; if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { va_start(ap, fmt); kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); va_end(ap); } } /* * tprintf functions: used to send messages to a specific process * * usage: * get a tpr_t handle on a process "p" by using "tprintf_open(p)" * use the handle when calling "tprintf" * when done, do a "tprintf_close" to drop the handle */ /* * tprintf_open: get a tprintf handle on a process "p" * * => returns NULL if process can't be printed to */ tpr_t tprintf_open(p) register struct proc *p; { if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { SESSHOLD(p->p_session); return ((tpr_t) p->p_session); } return ((tpr_t) NULL); } /* * tprintf_close: dispose of a tprintf handle obtained with tprintf_open */ void tprintf_close(sess) tpr_t sess; { if (sess) SESSRELE((struct session *) sess); } /* * tprintf: given tprintf handle to a process [obtained with tprintf_open], * send a message to the controlling tty for that process. * * => also sends message to /dev/klog */ void #ifdef __STDC__ tprintf(tpr_t tpr, const char *fmt, ...) #else tprintf(tpr, fmt, va_alist) tpr_t tpr; char *fmt; va_dcl #endif { register struct session *sess = (struct session *)tpr; struct tty *tp = NULL; int flags = TOLOG; va_list ap; logpri(LOG_INFO); if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { flags |= TOTTY; tp = sess->s_ttyp; } va_start(ap, fmt); kprintf(fmt, flags, tp, NULL, ap); va_end(ap); logwakeup(); } /* * ttyprintf: send a message to a specific tty * * => should be used only by tty driver or anything that knows the * underlying tty will not be revoked(2)'d away. [otherwise, * use tprintf] */ void #ifdef __STDC__ ttyprintf(struct tty *tp, const char *fmt, ...) #else ttyprintf(tp, fmt, va_alist) struct tty *tp; char *fmt; va_dcl #endif { va_list ap; va_start(ap, fmt); kprintf(fmt, TOTTY, tp, NULL, ap); va_end(ap); } #ifdef DDB /* * db_printf: printf for DDB (via db_putchar) */ int #ifdef __STDC__ db_printf(const char *fmt, ...) #else db_printf(fmt, va_alist) char *fmt; va_dcl #endif { va_list ap; int retval; va_start(ap, fmt); retval = kprintf(fmt, TODDB, NULL, NULL, ap); va_end(ap); return(retval); } #endif /* DDB */ /* * normal kernel printf functions: printf, vprintf, sprintf */ /* * printf: print a message to the console and the log */ int #ifdef __STDC__ printf(const char *fmt, ...) #else printf(fmt, va_alist) char *fmt; va_dcl #endif { va_list ap; int savintr, retval; savintr = consintr; /* disable interrupts */ consintr = 0; va_start(ap, fmt); retval = kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); va_end(ap); if (!panicstr) logwakeup(); consintr = savintr; /* reenable interrupts */ return(retval); } /* * vprintf: print a message to the console and the log [already have a * va_list] */ void vprintf(fmt, ap) const char *fmt; va_list ap; { int savintr; savintr = consintr; /* disable interrupts */ consintr = 0; kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); if (!panicstr) logwakeup(); consintr = savintr; /* reenable interrupts */ } /* * sprintf: print a message to a buffer */ int #ifdef __STDC__ sprintf(char *buf, const char *fmt, ...) #else sprintf(buf, fmt, va_alist) char *buf; const char *cfmt; va_dcl #endif { int retval; va_list ap; va_start(ap, fmt); retval = kprintf(fmt, TOBUFONLY, NULL, buf, ap); va_end(ap); *(buf + retval) = 0; /* null terminate */ return(retval); } /* * vsprintf: print a message to the provided buffer [already have a * va_list] */ int vsprintf(buf, fmt, ap) char *buf; const char *fmt; va_list ap; { int savintr; int len; savintr = consintr; /* disable interrupts */ consintr = 0; len = kprintf(fmt, TOBUFONLY, NULL, buf, ap); if (!panicstr) logwakeup(); consintr = savintr; /* reenable interrupts */ buf[len] = 0; return (0); } /* * snprintf: print a message to a buffer */ int #ifdef __STDC__ snprintf(char *buf, size_t size, const char *fmt, ...) #else snprintf(buf, size, fmt, va_alist) char *buf; size_t size; const char *cfmt; va_dcl #endif { int retval; va_list ap; char *p; if (size < 1) return (-1); p = buf + size - 1; va_start(ap, fmt); retval = kprintf(fmt, TOBUFONLY, &p, buf, ap); va_end(ap); *(p) = 0; /* null terminate */ return(retval); } /* * vsnprintf: print a message to a buffer [already have va_alist] */ int vsnprintf(buf, size, fmt, ap) char *buf; size_t size; const char *fmt; va_list ap; { int retval; char *p; if (size < 1) return (-1); p = buf + size - 1; retval = kprintf(fmt, TOBUFONLY, &p, buf, ap); *(p) = 0; /* null terminate */ return(retval); } /* * kprintf: scaled down version of printf(3). * * this version based on vfprintf() from libc which was derived from * software contributed to Berkeley by Chris Torek. * * Two additional formats: * * The format %b is supported to decode error registers. * Its usage is: * * printf("reg=%b\n", regval, "*"); * * where is the output base expressed as a control character, e.g. * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, * the first of which gives the bit number to be inspected (origin 1), and * the next characters (up to a control character, i.e. a character <= 32), * give the name of the register. Thus: * * kprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); * * would produce output: * * reg=3 * * The format %: passes an additional format string and argument list * recursively. Its usage is: * * fn(char *fmt, ...) * { * va_list ap; * va_start(ap, fmt); * printf("prefix: %: suffix\n", fmt, ap); * va_end(ap); * } * * this is the actual printf innards * * This code is large and complicated... */ /* * macros for converting digits to letters and vice versa */ #define to_digit(c) ((c) - '0') #define is_digit(c) ((unsigned)to_digit(c) <= 9) #define to_char(n) ((n) + '0') /* * flags used during conversion. */ #define ALT 0x001 /* alternate form */ #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ #define LADJUST 0x004 /* left adjustment */ #define LONGDBL 0x008 /* long double; unimplemented */ #define LONGINT 0x010 /* long integer */ #define QUADINT 0x020 /* quad integer */ #define SHORTINT 0x040 /* short integer */ #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ #define FPT 0x100 /* Floating point number */ /* * To extend shorts properly, we need both signed and unsigned * argument extraction methods. */ #define SARG() \ (flags&QUADINT ? va_arg(ap, quad_t) : \ flags&LONGINT ? va_arg(ap, long) : \ flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ (long)va_arg(ap, int)) #define UARG() \ (flags&QUADINT ? va_arg(ap, u_quad_t) : \ flags&LONGINT ? va_arg(ap, u_long) : \ flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ (u_long)va_arg(ap, u_int)) #define KPRINTF_PUTCHAR(C) { \ if (oflags == TOBUFONLY) { \ if ((vp != NULL) && (sbuf == tailp)) { \ ret += 1; /* indicate error */ \ goto overflow; \ } \ *sbuf++ = (C); \ } else { \ putchar((C), oflags, (struct tty *)vp); \ } \ } static int kprintf(fmt0, oflags, vp, sbuf, ap) const char *fmt0; int oflags; void *vp; char *sbuf; va_list ap; { char *fmt; /* format string */ int ch; /* character from fmt */ int n; /* handy integer (short term usage) */ char *cp; /* handy char pointer (short term usage) */ int flags; /* flags as above */ int ret; /* return value accumulator */ int width; /* width from format (%8d), or 0 */ int prec; /* precision from format (%.3d), or -1 */ char sign; /* sign prefix (' ', '+', '-', or \0) */ u_quad_t _uquad; /* integer arguments %[diouxX] */ enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ int dprec; /* a copy of prec if [diouxX], 0 otherwise */ int realsz; /* field size expanded by dprec */ int size; /* size of converted field or string */ char *xdigs; /* digits for [xX] conversion */ char buf[KPRINTF_BUFSIZE]; /* space for %c, %[diouxX] */ char *tailp; /* tail pointer for snprintf */ tailp = NULL; /* XXX: shutup gcc */ if (oflags == TOBUFONLY && (vp != NULL)) tailp = *(char **)vp; cp = NULL; /* XXX: shutup gcc */ size = 0; /* XXX: shutup gcc */ fmt = (char *)fmt0; ret = 0; xdigs = NULL; /* XXX: shut up gcc warning */ /* * Scan the format for conversions (`%' character). */ for (;;) { while (*fmt != '%' && *fmt) { ret++; KPRINTF_PUTCHAR(*fmt++); } if (*fmt == 0) goto done; fmt++; /* skip over '%' */ flags = 0; dprec = 0; width = 0; prec = -1; sign = '\0'; rflag: ch = *fmt++; reswitch: switch (ch) { /* XXX: non-standard '%:' format */ #ifndef __powerpc__ case ':': if (oflags != TOBUFONLY) { cp = va_arg(ap, char *); kprintf(cp, oflags, vp, NULL, va_arg(ap, va_list)); } continue; /* no output */ #endif /* XXX: non-standard '%b' format */ case 'b': { char *b, *z; int tmp; _uquad = va_arg(ap, u_int); b = va_arg(ap, char *); if (*b == 8) sprintf(buf, "%qo", _uquad); else if (*b == 10) sprintf(buf, "%qd", _uquad); else if (*b == 16) sprintf(buf, "%qx", _uquad); else break; b++; z = buf; while (*z) { ret++; KPRINTF_PUTCHAR(*z++); } if (_uquad) { tmp = 0; while ((n = *b++) != 0) { if (_uquad & (1 << (n - 1))) { ret++; KPRINTF_PUTCHAR(tmp ? ',':'<'); while ((n = *b) > ' ') { ret++; KPRINTF_PUTCHAR(n); b++; } tmp = 1; } else { while(*b > ' ') b++; } } if (tmp) { ret++; KPRINTF_PUTCHAR('>'); } } continue; /* no output */ } #ifdef DDB /* XXX: non-standard '%r' format (print int in db_radix) */ case 'r': if ((oflags & TODDB) == 0) goto default_case; if (db_radix == 16) goto case_z; /* signed hex */ _uquad = SARG(); if ((quad_t)_uquad < 0) { _uquad = -_uquad; sign = '-'; } base = (db_radix == 8) ? OCT : DEC; goto number; /* XXX: non-standard '%z' format ("signed hex", a "hex %i")*/ case 'z': case_z: if ((oflags & TODDB) == 0) goto default_case; xdigs = "0123456789abcdef"; ch = 'x'; /* the 'x' in '0x' (below) */ _uquad = SARG(); base = HEX; /* leading 0x/X only if non-zero */ if (flags & ALT && _uquad != 0) flags |= HEXPREFIX; if ((quad_t)_uquad < 0) { _uquad = -_uquad; sign = '-'; } goto number; #endif case ' ': /* * ``If the space and + flags both appear, the space * flag will be ignored.'' * -- ANSI X3J11 */ if (!sign) sign = ' '; goto rflag; case '#': flags |= ALT; goto rflag; case '*': /* * ``A negative field width argument is taken as a * - flag followed by a positive field width.'' * -- ANSI X3J11 * They don't exclude field widths read from args. */ if ((width = va_arg(ap, int)) >= 0) goto rflag; width = -width; /* FALLTHROUGH */ case '-': flags |= LADJUST; goto rflag; case '+': sign = '+'; goto rflag; case '.': if ((ch = *fmt++) == '*') { n = va_arg(ap, int); prec = n < 0 ? -1 : n; goto rflag; } n = 0; while (is_digit(ch)) { n = 10 * n + to_digit(ch); ch = *fmt++; } prec = n < 0 ? -1 : n; goto reswitch; case '0': /* * ``Note that 0 is taken as a flag, not as the * beginning of a field width.'' * -- ANSI X3J11 */ flags |= ZEROPAD; goto rflag; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': n = 0; do { n = 10 * n + to_digit(ch); ch = *fmt++; } while (is_digit(ch)); width = n; goto reswitch; case 'h': flags |= SHORTINT; goto rflag; case 'l': if (*fmt == 'l') { fmt++; flags |= QUADINT; } else { flags |= LONGINT; } goto rflag; case 'q': flags |= QUADINT; goto rflag; case 'c': *(cp = buf) = va_arg(ap, int); size = 1; sign = '\0'; break; case 'D': flags |= LONGINT; /*FALLTHROUGH*/ case 'd': case 'i': _uquad = SARG(); if ((quad_t)_uquad < 0) { _uquad = -_uquad; sign = '-'; } base = DEC; goto number; case 'n': #ifdef DDB /* XXX: non-standard '%n' format */ /* * XXX: HACK! DDB wants '%n' to be a '%u' printed * in db_radix format. this should die since '%n' * is already defined in standard printf to write * the number of chars printed so far to the arg (which * should be a pointer. */ if (oflags & TODDB) { if (db_radix == 16) ch = 'x'; /* convert to %x */ else if (db_radix == 8) ch = 'o'; /* convert to %o */ else ch = 'u'; /* convert to %u */ /* ... and start again */ goto reswitch; } #endif if (flags & QUADINT) *va_arg(ap, quad_t *) = ret; else if (flags & LONGINT) *va_arg(ap, long *) = ret; else if (flags & SHORTINT) *va_arg(ap, short *) = ret; else *va_arg(ap, int *) = ret; continue; /* no output */ case 'O': flags |= LONGINT; /*FALLTHROUGH*/ case 'o': _uquad = UARG(); base = OCT; goto nosign; case 'p': /* * ``The argument shall be a pointer to void. The * value of the pointer is converted to a sequence * of printable characters, in an implementation- * defined manner.'' * -- ANSI X3J11 */ /* NOSTRICT */ _uquad = (u_long)va_arg(ap, void *); base = HEX; xdigs = "0123456789abcdef"; flags |= HEXPREFIX; ch = 'x'; goto nosign; case 's': if ((cp = va_arg(ap, char *)) == NULL) cp = "(null)"; if (prec >= 0) { /* * can't use strlen; can only look for the * NUL in the first `prec' characters, and * strlen() will go further. */ char *p = memchr(cp, 0, prec); if (p != NULL) { size = p - cp; if (size > prec) size = prec; } else size = prec; } else size = strlen(cp); sign = '\0'; break; case 'U': flags |= LONGINT; /*FALLTHROUGH*/ case 'u': _uquad = UARG(); base = DEC; goto nosign; case 'X': xdigs = "0123456789ABCDEF"; goto hex; case 'x': xdigs = "0123456789abcdef"; hex: _uquad = UARG(); base = HEX; /* leading 0x/X only if non-zero */ if (flags & ALT && _uquad != 0) flags |= HEXPREFIX; /* unsigned conversions */ nosign: sign = '\0'; /* * ``... diouXx conversions ... if a precision is * specified, the 0 flag will be ignored.'' * -- ANSI X3J11 */ number: if ((dprec = prec) >= 0) flags &= ~ZEROPAD; /* * ``The result of converting a zero value with an * explicit precision of zero is no characters.'' * -- ANSI X3J11 */ cp = buf + KPRINTF_BUFSIZE; if (_uquad != 0 || prec != 0) { /* * Unsigned mod is hard, and unsigned mod * by a constant is easier than that by * a variable; hence this switch. */ switch (base) { case OCT: do { *--cp = to_char(_uquad & 7); _uquad >>= 3; } while (_uquad); /* handle octal leading 0 */ if (flags & ALT && *cp != '0') *--cp = '0'; break; case DEC: /* many numbers are 1 digit */ while (_uquad >= 10) { *--cp = to_char(_uquad % 10); _uquad /= 10; } *--cp = to_char(_uquad); break; case HEX: do { *--cp = xdigs[_uquad & 15]; _uquad >>= 4; } while (_uquad); break; default: cp = "bug in kprintf: bad base"; size = strlen(cp); goto skipsize; } } size = buf + KPRINTF_BUFSIZE - cp; skipsize: break; default: /* "%?" prints ?, unless ? is NUL */ #ifdef DDB default_case: /* DDB */ #endif if (ch == '\0') goto done; /* pretend it was %c with argument ch */ cp = buf; *cp = ch; size = 1; sign = '\0'; break; } /* * All reasonable formats wind up here. At this point, `cp' * points to a string which (if not flags&LADJUST) should be * padded out to `width' places. If flags&ZEROPAD, it should * first be prefixed by any sign or other prefix; otherwise, * it should be blank padded before the prefix is emitted. * After any left-hand padding and prefixing, emit zeroes * required by a decimal [diouxX] precision, then print the * string proper, then emit zeroes required by any leftover * floating precision; finally, if LADJUST, pad with blanks. * * Compute actual size, so we know how much to pad. * size excludes decimal prec; realsz includes it. */ realsz = dprec > size ? dprec : size; if (sign) realsz++; else if (flags & HEXPREFIX) realsz+= 2; /* adjust ret */ ret += width > realsz ? width : realsz; /* right-adjusting blank padding */ if ((flags & (LADJUST|ZEROPAD)) == 0) { n = width - realsz; while (n-- > 0) KPRINTF_PUTCHAR(' '); } /* prefix */ if (sign) { KPRINTF_PUTCHAR(sign); } else if (flags & HEXPREFIX) { KPRINTF_PUTCHAR('0'); KPRINTF_PUTCHAR(ch); } /* right-adjusting zero padding */ if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) { n = width - realsz; while (n-- > 0) KPRINTF_PUTCHAR('0'); } /* leading zeroes from decimal precision */ n = dprec - size; while (n-- > 0) KPRINTF_PUTCHAR('0'); /* the string or number proper */ while (size--) KPRINTF_PUTCHAR(*cp++); /* left-adjusting padding (always blank) */ if (flags & LADJUST) { n = width - realsz; while (n-- > 0) KPRINTF_PUTCHAR(' '); } } done: if ((oflags == TOBUFONLY) && (vp != NULL)) *(char **)vp = sbuf; overflow: return (ret); /* NOTREACHED */ }