/* $NetBSD: subr_prf.c,v 1.29.20.1 2023/06/03 14:33:55 martin Exp $ */ /*- * Copyright (c) 1993 * The Regents of the University of California. All rights reserved. * * 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. 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. * * @(#)printf.c 8.1 (Berkeley) 6/11/93 */ /* * Scaled down version of printf(3). */ #include #include #include /* XXX: for intptr_t */ #include "stand.h" #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT #define INTMAX_T longlong_t #define UINTMAX_T u_longlong_t #else #define INTMAX_T long #define UINTMAX_T u_long #endif #if 0 /* XXX: abuse intptr_t until the situation with ptrdiff_t is clear */ #define PTRDIFF_T ptrdiff_t #else #define PTRDIFF_T intptr_t #endif #ifdef LIBSA_PRINTF_WIDTH_SUPPORT static void kprintn(void (*)(int), UINTMAX_T, int, int, int); #else static void kprintn(void (*)(int), UINTMAX_T, int); #endif static void sputchar(int); static void kdoprnt(void (*)(int), const char *, va_list); static char *sbuf, *ebuf; const char hexdigits[16] = "0123456789abcdef"; #define LONG 0x01 #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT #define LLONG 0x02 #endif #ifdef LIBSA_PRINTF_WIDTH_SUPPORT #define ALT 0x04 #define SPACE 0x08 #define LADJUST 0x10 #define SIGN 0x20 #define ZEROPAD 0x40 #define NEGATIVE 0x80 #define KPRINTN(base) kprintn(put, ul, base, lflag, width) #define RADJUSTZEROPAD() \ do { \ if ((lflag & (ZEROPAD|LADJUST)) == ZEROPAD) { \ while (width-- > 0) \ put('0'); \ } \ } while (/*CONSTCOND*/0) #define LADJUSTPAD() \ do { \ if (lflag & LADJUST) { \ while (width-- > 0) \ put(' '); \ } \ } while (/*CONSTCOND*/0) #define RADJUSTPAD() \ do { \ if ((lflag & (ZEROPAD|LADJUST)) == 0) { \ while (width-- > 0) \ put(' '); \ } \ } while (/*CONSTCOND*/0) #else /* LIBSA_PRINTF_WIDTH_SUPPORT */ #define KPRINTN(base) kprintn(put, ul, base) #define RADJUSTZEROPAD() /**/ #define LADJUSTPAD() /**/ #define RADJUSTPAD() /**/ #endif /* LIBSA_PRINTF_WIDTH_SUPPORT */ #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT #define KPRINT(base) \ do { \ ul = (lflag & LLONG) \ ? va_arg(ap, u_longlong_t) \ : (lflag & LONG) \ ? va_arg(ap, u_long) \ : va_arg(ap, u_int); \ KPRINTN(base); \ } while (/*CONSTCOND*/0) #else /* LIBSA_PRINTF_LONGLONG_SUPPORT */ #define KPRINT(base) \ do { \ ul = (lflag & LONG) \ ? va_arg(ap, u_long) : va_arg(ap, u_int); \ KPRINTN(base); \ } while (/*CONSTCOND*/0) #endif /* LIBSA_PRINTF_LONGLONG_SUPPORT */ static void null_sputchar(int c) { sbuf++; } static void sputchar(int c) { if (sbuf < ebuf) *sbuf++ = c; } void vprintf(const char *fmt, va_list ap) { kdoprnt(putchar, fmt, ap); } int vsnprintf(char *buf, size_t size, const char *fmt, va_list ap) { sbuf = buf; ebuf = buf + size - 1; kdoprnt(buf == NULL ? null_sputchar : sputchar, fmt, ap); if (buf != NULL) *sbuf = '\0'; return sbuf - buf; } static void kdoprnt(void (*put)(int), const char *fmt, va_list ap) { char *p; int ch; UINTMAX_T ul; int lflag; #ifdef LIBSA_PRINTF_WIDTH_SUPPORT int width; char *q; #endif for (;;) { while ((ch = *fmt++) != '%') { if (ch == '\0') return; put(ch); } lflag = 0; #ifdef LIBSA_PRINTF_WIDTH_SUPPORT width = 0; #endif reswitch: switch (ch = *fmt++) { #ifdef LIBSA_PRINTF_WIDTH_SUPPORT case '#': lflag |= ALT; goto reswitch; case ' ': lflag |= SPACE; goto reswitch; case '-': lflag |= LADJUST; goto reswitch; case '+': lflag |= SIGN; goto reswitch; case '0': lflag |= ZEROPAD; goto reswitch; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': for (;;) { width *= 10; width += ch - '0'; ch = *fmt; if ((unsigned)ch - '0' > 9) break; ++fmt; } goto reswitch; #endif case 'l': #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT if (*fmt == 'l') { ++fmt; lflag |= LLONG; } else #endif lflag |= LONG; goto reswitch; case 'j': #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT if (sizeof(intmax_t) == sizeof(long long)) lflag |= LLONG; else #endif if (sizeof(intmax_t) == sizeof(long)) lflag |= LONG; goto reswitch; case 't': if (sizeof(PTRDIFF_T) == sizeof(long)) lflag |= LONG; goto reswitch; case 'z': if (sizeof(ssize_t) == sizeof(long)) lflag |= LONG; goto reswitch; case 'c': ch = va_arg(ap, int); #ifdef LIBSA_PRINTF_WIDTH_SUPPORT --width; #endif RADJUSTPAD(); put(ch & 0xFF); LADJUSTPAD(); break; case 's': p = va_arg(ap, char *); #ifdef LIBSA_PRINTF_WIDTH_SUPPORT for (q = p; *q != '\0'; ++q) continue; width -= q - p; #endif RADJUSTPAD(); while ((ch = (unsigned char)*p++)) put(ch); LADJUSTPAD(); break; case 'd': ul = #ifdef LIBSA_PRINTF_LONGLONG_SUPPORT (lflag & LLONG) ? va_arg(ap, longlong_t) : #endif (lflag & LONG) ? va_arg(ap, long) : va_arg(ap, int); if ((INTMAX_T)ul < 0) { ul = -(INTMAX_T)ul; #ifdef LIBSA_PRINTF_WIDTH_SUPPORT lflag |= NEGATIVE; #else put('-'); #endif } KPRINTN(10); break; case 'o': KPRINT(8); break; case 'u': KPRINT(10); break; case 'p': #ifdef LIBSA_PRINTF_WIDTH_SUPPORT lflag |= (LONG|ALT); #else put('0'); put('x'); #endif /* FALLTHROUGH */ case 'x': KPRINT(16); break; default: if (ch == '\0') return; put(ch); break; } } } static void #ifdef LIBSA_PRINTF_WIDTH_SUPPORT kprintn(void (*put)(int), UINTMAX_T ul, int base, int lflag, int width) #else kprintn(void (*put)(int), UINTMAX_T ul, int base) #endif { /* hold a INTMAX_T in base 8 */ char *p, buf[(sizeof(INTMAX_T) * NBBY / 3) + 1 + 2 /* ALT + SIGN */]; #ifdef LIBSA_PRINTF_WIDTH_SUPPORT char *q; #endif p = buf; do { *p++ = hexdigits[ul % base]; } while (ul /= base); #ifdef LIBSA_PRINTF_WIDTH_SUPPORT q = p; if (lflag & ALT && *(p - 1) != '0') { if (base == 8) { *p++ = '0'; } else if (base == 16) { *p++ = 'x'; *p++ = '0'; } } if (lflag & NEGATIVE) *p++ = '-'; else if (lflag & SIGN) *p++ = '+'; else if (lflag & SPACE) *p++ = ' '; width -= p - buf; if (lflag & ZEROPAD) { while (p > q) put(*--p); } #endif RADJUSTPAD(); RADJUSTZEROPAD(); do { put(*--p); } while (p > buf); LADJUSTPAD(); }