snprintf.cc

功能较全面的反汇编器：反汇编器ht-2.0.15.tar.gz

/*
 * Copyright Patrick Powell 1995
 * This code is based on code written by Patrick Powell ([e-mail])
 * It may be used for any purpose as long as this notice remains intact
 * on all source code distributions
 */

/**************************************************************
 * Original:
 * Patrick Powell Tue Apr 11 09:48:21 PDT 1995
 * A bombproof version of doprnt (dopr) included.
 * Sigh.  This sort of thing is always nasty do deal with.  Note that
 * the version here does not include floating point...
 *
 * snprintf() is used instead of sprintf() as it does limit checks
 * for string length.  This covers a nasty loophole.
 *
 * The other functions are there to prevent NULL pointers from
 * causing nast effects.
 *
 * More Recently:
 *  Brandon Long <[e-mail]> 9/15/96 for mutt 0.43
 *  This was ugly.  It is still ugly.  I opted out of floating point
 *  numbers, but the formatter understands just about everything
 *  from the normal C string format, at least as far as I can tell from
 *  the Solaris 2.5 printf(3S) man page.
 *
 *  Brandon Long <[e-mail]> 10/22/97 for mutt 0.87.1
 *    Ok, added some minimal floating point support, which means this
 *    probably requires libm on most operating systems.  Don't yet
 *    support the exponent (e,E) and sigfig (g,G).  Also, fmtint()
 *    was pretty badly broken, it just wasn't being exercised in ways
 *    which showed it, so that's been fixed.  Also, formated the code
 *    to mutt conventions, and removed dead code left over from the
 *    original.  Also, there is now a builtin-test, just compile with:
 *           gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm
 *    and run snprintf for results.
 * 
 *  Thomas Roessler <[e-mail]> 01/27/98 for mutt 0.89i
 *    The PGP code was using unsigned hexadecimal formats. 
 *    Unfortunately, unsigned formats simply didn't work.
 *
 *  Michael Elkins <[e-mail]> 03/05/98 for mutt 0.90.8
 *    The original code assumed that both snprintf() and vsnprintf() were
 *    missing.  Some systems only have snprintf() but not vsnprintf(), so
 *    the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF.
 *
 *  Andrew Tridgell ([e-mail]) Oct 1998
 *    fixed handling of %.0f
 *    added test for HAVE_LONG_DOUBLE
 *
 * [e-mail], [e-mail], April 2001
 *    got rid of fcvt code (twas buggy and made testing harder)
 *    added C99 semantics
 *
 * HT authors
 *    * ht_snprintf/ht_vsnprintf return number of characters actually
 *      written instead of the number of characters that would
 *      have been written.
 *    * added '%y' to allow object output using Object's toString() method.
 *    * added '%q[dioux]' for formatting qwords.
 *    * added '%b' for formatting in binary notation.
 **************************************************************/

#include <cctype>
#include <cstring>
#include <cstdlib>
#include <cstdio>
#include <cstdarg>
#include <sys/types.h>

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "io/types.h"
#include "data.h"

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
#ifndef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif

#ifdef HAVE_LONG_DOUBLE
#define LDOUBLE long double
#else
#define LDOUBLE double
#endif

#ifdef HAVE_LONG_LONG
#define LLONG long long
#else
#define LLONG long
#endif

static size_t dopr(char *buffer, size_t maxlen, const char *format, 
			    va_list args);
static void fmtstr(char *buffer, size_t *currlen, size_t maxlen,
				const char *value, int flags, int min, int max);
static void fmtint(char *buffer, size_t *currlen, size_t maxlen,
				long value, int base, int min, int max, int flags);
static void fmtqword(char *buffer, size_t *currlen, size_t maxlen,
				sint64 value, int base, int min, int max, int flags);
static void fmtfp(char *buffer, size_t *currlen, size_t maxlen,
			    LDOUBLE fvalue, int min, int max, int flags);
static void dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c);

/*
 * dopr(): poor man's version of doprintf
 */

/* format read states */
#define DP_S_DEFAULT 0
#define DP_S_FLAGS   1
#define DP_S_MIN     2
#define DP_S_DOT     3
#define DP_S_MAX     4
#define DP_S_MOD     5
#define DP_S_CONV    6
#define DP_S_DONE    7

/* format flags - Bits */
#define DP_F_MINUS      (1 << 0)
#define DP_F_PLUS       (1 << 1)
#define DP_F_SPACE      (1 << 2)
#define DP_F_NUM        (1 << 3)
#define DP_F_ZERO       (1 << 4)
#define DP_F_UP         (1 << 5)
#define DP_F_UNSIGNED   (1 << 6)

/* Conversion Flags */
#define DP_C_SHORT   1
#define DP_C_LONG    2
#define DP_C_LDOUBLE 3
#define DP_C_LLONG   4
#define DP_C_QWORD   5

#define char_to_int(p) ((p)- '0')
#ifndef MAX
#define MAX(p,q) (((p) >= (q)) ? (p) : (q))
#endif

static size_t dopr(char *buffer, size_t maxlen, const char *format, va_list args)
{
	char ch;
	LLONG value;
	LDOUBLE fvalue;
	const char *strvalue;
	int min;
	int max;
	int state;
	int flags;
	int cflags;
	size_t currlen;

	state = DP_S_DEFAULT;
	currlen = flags = cflags = min = 0;
	max = -1;
	ch = *format++;

	while (state != DP_S_DONE) {
		if (ch == '\0') state = DP_S_DONE;

		switch(state) {
			case DP_S_DEFAULT:
				if (ch == '%') {
					state = DP_S_FLAGS;
				} else {
					dopr_outch(buffer, &currlen, maxlen, ch);
				}
				ch = *format++;
				break;
			case DP_S_FLAGS:
				switch (ch) {
					case '-':
						flags |= DP_F_MINUS;
						ch = *format++;
						break;
					case '+':
						flags |= DP_F_PLUS;
						ch = *format++;
						break;
					case ' ':
						flags |= DP_F_SPACE;
						ch = *format++;
						break;
					case '#':
						flags |= DP_F_NUM;
						ch = *format++;
						break;
					case '0':
						flags |= DP_F_ZERO;
						ch = *format++;
						break;
					default:
						state = DP_S_MIN;
						break;
				}
				break;
			case DP_S_MIN:
				if (isdigit((unsigned char)ch)) {
					min = 10*min + char_to_int (ch);
					ch = *format++;
				} else if (ch == '*') {
					min = va_arg (args, int);
					ch = *format++;
					state = DP_S_DOT;
				} else {
					state = DP_S_DOT;
				}
				break;
			case DP_S_DOT:
				if (ch == '.') {
					state = DP_S_MAX;
					ch = *format++;
				} else {
					state = DP_S_MOD;
				}
				break;
			case DP_S_MAX:
				if (isdigit((unsigned char)ch)) {
					if (max < 0) max = 0;
					max = 10*max + char_to_int (ch);
					ch = *format++;
				} else if (ch == '*') {
					max = va_arg (args, int);
					ch = *format++;
					state = DP_S_MOD;
				} else {
					state = DP_S_MOD;
				}
				break;
			case DP_S_MOD:
				switch (ch) {
					case 'h':
						cflags = DP_C_SHORT;
						ch = *format++;
						break;
					case 'l':
						cflags = DP_C_LONG;
						ch = *format++;
						if (ch == 'l') {        /* It's a long long */
							cflags = DP_C_LLONG;
							ch = *format++;
						}
						break;
					case 'L':
						cflags = DP_C_LDOUBLE;
						ch = *format++;
						break;
					case 'q':
						cflags = DP_C_QWORD;
						ch = *format++;
						break;
					default:
					break;
				}
				state = DP_S_CONV;
				break;
			case DP_S_CONV:
				switch (ch) {
					case 'b':
						flags |= DP_F_UNSIGNED;
						if (cflags == DP_C_SHORT) {
							value = va_arg (args, unsigned int);
						} else if (cflags == DP_C_LONG) {
							value = (long)va_arg (args, unsigned long int);
						} else if (cflags == DP_C_LLONG) {
							value = (LLONG)va_arg (args, unsigned LLONG);
						} else if (cflags == DP_C_QWORD) {
							sint64 q = va_arg (args, sint64);
							fmtqword(buffer, &currlen, maxlen, q, 2, min, max, flags);
							break;
						} else {
						   value = (long)va_arg (args, unsigned int);
						}
						fmtint (buffer, &currlen, maxlen, value, 2, min, max, flags);
						break;
					case 'd':
					case 'i':
						if (cflags == DP_C_SHORT) {
							value = va_arg (args, int);
						} else if (cflags == DP_C_LONG) {
							value = va_arg (args, long int);
						} else if (cflags == DP_C_LLONG) {
							value = va_arg (args, LLONG);
						} else if (cflags == DP_C_QWORD) {
							sint64 q = va_arg (args, sint64);
							fmtqword(buffer, &currlen, maxlen, q, 10, min, max, flags);
							break;
						} else {
							value = va_arg (args, int);
						}
						fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
						break;
					case 'o':
						flags |= DP_F_UNSIGNED;
						if (cflags == DP_C_SHORT) {
							value = va_arg (args, unsigned int);
						} else if (cflags == DP_C_LONG) {
							value = (long)va_arg (args, unsigned long int);
						} else if (cflags == DP_C_LLONG) {
							value = (long)va_arg (args, unsigned LLONG);
						} else if (cflags == DP_C_QWORD) {
							sint64 q = va_arg (args, sint64);
							fmtqword(buffer, &currlen, maxlen, q, 8, min, max, flags);
							break;
						} else {
							value = (long)va_arg (args, unsigned int);
						}
						fmtint (buffer, &currlen, maxlen, value, 8, min, max, flags);
						break;
					case 'u':
						flags |= DP_F_UNSIGNED;
						if (cflags == DP_C_SHORT) {
							value = va_arg (args, unsigned int);
						} else if (cflags == DP_C_LONG) {
							value = (long)va_arg (args, unsigned long int);
						} else if (cflags == DP_C_LLONG) {
							value = (LLONG)va_arg (args, unsigned LLONG);
						} else if (cflags == DP_C_QWORD) {
							sint64 q = va_arg (args, sint64);
							fmtqword(buffer, &currlen, maxlen, q, 10, min, max, flags);
							break;
						} else {
							value = (long)va_arg (args, unsigned int);
						}
						fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
						break;
					case 'X':
						flags |= DP_F_UP;
					case 'x':
						flags |= DP_F_UNSIGNED;
						if (cflags == DP_C_SHORT) {
							value = va_arg (args, unsigned int);
						} else if (cflags == DP_C_LONG) {
							value = (long)va_arg (args, unsigned long int);
						} else if (cflags == DP_C_LLONG) {
							value = (LLONG)va_arg (args, unsigned LLONG);
						} else if (cflags == DP_C_QWORD) {
							sint64 q = va_arg (args, sint64);
							fmtqword(buffer, &currlen, maxlen, q, 16, min, max, flags);
							break;
						} else {
							value = (long)va_arg (args, unsigned int);
						}
						fmtint (buffer, &currlen, maxlen, value, 16, min, max, flags);
						break;
					case 'f':
						if (cflags == DP_C_LDOUBLE)
							fvalue = va_arg (args, LDOUBLE);
						else
							fvalue = va_arg (args, double);
						/* um, floating point? */
						fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags);
						break;
					case 'E':
						flags |= DP_F_UP;
					case 'e':
						if (cflags == DP_C_LDOUBLE)
							fvalue = va_arg (args, LDOUBLE);
						else
							fvalue = va_arg (args, double);
						break;
					case 'G':
						flags |= DP_F_UP;
					case 'g':
						if (cflags == DP_C_LDOUBLE)
							fvalue = va_arg (args, LDOUBLE);
						else
							fvalue = va_arg (args, double);
						break;
					case 'c':
						dopr_outch(buffer, &currlen, maxlen, va_arg (args, int));
						break;
					case 's':
						strvalue = va_arg (args, char *);
						if (!strvalue) strvalue = "(null)";
						if (max == -1) {
							max = strlen(strvalue);
						}
						if (min > 0 && max >= 0 && min > max) max = min;
						fmtstr(buffer, &currlen, maxlen, strvalue, flags, min, max);
						break;
					case 'p':
						strvalue = va_arg (args, char *);
						fmtint (buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
						break;
					case 'n':
						if (cflags == DP_C_SHORT) {
							short int *num;
							num = va_arg (args, short int *);
							*num = currlen;
						} else if (cflags == DP_C_LONG) {
							long int *num;
							num = va_arg (args, long int *);
							*num = (long int)currlen;
						} else if (cflags == DP_C_LLONG) {
							LLONG *num;
							num = va_arg (args, LLONG *);
							*num = (LLONG)currlen;
						} else {
							int *num;
							num = va_arg (args, int *);
							*num = currlen;
						}
						break;
					case '%':
						dopr_outch(buffer, &currlen, maxlen, ch);
						break;
					case 'w':
						/* not supported yet, treat as next char */
						ch = *format++;
						break;
					case 'y': {
						/* object */
						Object *obj = va_arg (args, Object *);
						if (obj) {
							currlen += obj->toString(buffer+currlen, maxlen - currlen);
						} else {
							strvalue = "(null)";
							if (max == -1) {
								max = strlen(strvalue);
							}
							if (min > 0 && max >= 0 && min > max) max = min;
							fmtstr (buffer, &currlen, maxlen, strvalue, flags, min, max);
						}
						break;
					}
					default:
						/* Unknown, skip */
						break;
				}
				ch = *format++;
				state = DP_S_DEFAULT;
				flags = cflags = min = 0;
				max = -1;
				break;
			case DP_S_DONE:
				break;
			default:
				/* hmm? */
				break; /* some picky compilers need this */
		}
	}
	if (maxlen != 0) {
		if (currlen < maxlen - 1)
			buffer[currlen] = '\0';
		else if (maxlen > 0)
			buffer[maxlen - 1] = '\0';
	}

	return currlen;
}

static void fmtstr(char *buffer, size_t *currlen, size_t maxlen,
				const char *value, int flags, int min, int max)
{
	int padlen, strln;     /* amount to pad */
	int cnt = 0;

#ifdef DEBUG_SNPRINTF
	printf("fmtstr min=%d max=%d s=[%s]\n", min, max, value);
#endif

	for (strln = 0; value[strln]; ++strln); /* strlen */
	padlen = min - strln;
	if (padlen < 0)
		padlen = 0;
	if (flags & DP_F_MINUS)
		padlen = -padlen; /* Left Justify */

	while ((padlen > 0) && (cnt < max)) {
		dopr_outch(buffer, currlen, maxlen, ' ');
		--padlen;
		++cnt;
	}
	while (*value && (cnt < max)) {
		dopr_outch(buffer, currlen, maxlen, *value++);
		++cnt;
	}
	while ((padlen < 0) && (cnt < max)) {
		dopr_outch(buffer, currlen, maxlen, ' ');
		++padlen;
		++cnt;