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+/*
+ * This version of snprintf() and vsnprintf() is based on Sprint from
+ * SIO by Panagiotis Tsirigotis, as included with xidentd-2.2.1.
+ *
+ * The modifications were made by The XFree86 Project, Inc and are
+ * Copyright 1999 by The XFree86 Project, Inc. These modifications
+ * consist of removing the support for writing to file streams,
+ * renaming some functions, ansification, and making some adjustments
+ * to achieve the semantics for snprintf and vsnprintf() as described
+ * in the relevant man page for FreeBSD 2.2.8.
+ *
+ *
+ * The original version carries the following notice:
+ *
+ * (c) Copyright 1992, 1993 by Panagiotis Tsirigotis
+ *
+ * The author (Panagiotis Tsirigotis) grants permission to use, copy,
+ * and distribute this software and its documentation for any purpose
+ * and without fee, provided that a) the above copyright notice extant in
+ * files in this distribution is not removed from files included in any
+ * redistribution, and b) this file is also included in any redistribution.
+ *
+ * Modifications to this software may be distributed, either by distributing
+ * the modified software or by distributing patches to the original software,
+ * under the following additional terms:
+ *
+ * 1. The version number will be modified as follows:
+ * a. The first 3 components of the version number
+ * (i.e. <number>.<number>.<number>) will remain unchanged.
+ * b. A new component will be appended to the version number to indicate
+ * the modification level. The form of this component is up to the
+ * author of the modifications.
+ *
+ * 2. The author of the modifications will include his/her name by appending
+ * it along with the new version number to this file and will be
+ * responsible for any wrong behavior of the modified software.
+ *
+ * The author makes no representations about the suitability of this
+ * software for any purpose. It is provided "as is" without any express
+ * or implied warranty.
+ *
+ * Changes and modifications for:
+ *
+ * xinetd Version 2.1.4-bsdi
+ * xinetd Version 2.1.4-freebsd
+ * xinetd Version 2.1.4-linux
+ *
+ * are
+ *
+ * (c) Copyright 1995 by Charles Murcko
+ * All Rights Reserved
+ */
+
+/* $XFree86$ */
+
+
+/*
+ * Assumption: systems that don't have snprintf and vsnprintf do have
+ * ecvt, fcvt and gcvt.
+ */
+
+/* From: Id: sprint.c,v 1.5 1995/09/10 18:35:09 chuck Exp */
+
+#include <ctype.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <sys/types.h>
+
+#ifndef SCOPE
+#define SCOPE /**/
+#endif
+
+#ifndef WIDE_INT
+#define WIDE_INT long
+#endif
+
+typedef WIDE_INT wide_int;
+typedef unsigned WIDE_INT u_wide_int;
+typedef int bool_int;
+
+#ifndef FALSE
+#define FALSE 0
+#define TRUE 1
+#endif
+
+#define NUL '\0'
+
+#define S_NULL "(null)"
+#define S_NULL_LEN 6
+
+#define FLOAT_DIGITS 6
+#define EXPONENT_LENGTH 10
+
+typedef enum { NO = 0, YES = 1 } boolean_e ;
+
+/*
+ * NUM_BUF_SIZE is the size of the buffer used for arithmetic conversions
+ *
+ * XXX: this is a magic number; do not decrease it
+ */
+#define NUM_BUF_SIZE 512
+
+/*
+ * The INS_CHAR macro inserts a character in the buffer.
+ * It uses the char pointers sp and bep:
+ * sp points to the next available character in the buffer
+ * bep points to the end-of-buffer
+ * While using this macro, note that the nextb pointer is NOT updated.
+ *
+ * Excess characters are discarded if the string overflows.
+ *
+ * NOTE: Evaluation of the c argument should not have any side-effects
+ */
+#define INS_CHAR( c, sp, bep, cc ) \
+ { \
+ if ( sp != NULL && sp < bep ) \
+ *sp++ = c ; \
+ cc++ ; \
+ }
+
+#define NUM( c ) ( c - '0' )
+
+#define STR_TO_DEC( str, num ) \
+ num = NUM( *str++ ) ; \
+ while ( isdigit( *str ) ) { \
+ num *= 10 ; \
+ num += NUM( *str++ ) ; \
+ }
+
+/*
+ * This macro does zero padding so that the precision
+ * requirement is satisfied. The padding is done by
+ * adding '0's to the left of the string that is going
+ * to be printed.
+ */
+#define FIX_PRECISION( adjust, precision, s, s_len ) \
+ if ( adjust ) \
+ while ( s_len < precision ) { \
+ *--s = '0' ; \
+ s_len++ ; \
+ }
+
+/*
+ * Macro that does padding. The padding is done by printing
+ * the character ch.
+ */
+#define PAD( width, len, ch ) \
+ do { \
+ INS_CHAR( ch, sp, bep, cc ) ; \
+ width-- ; \
+ } while ( width > len )
+
+/*
+ * Prefix the character ch to the string str
+ * Increase length
+ * Set the has_prefix flag
+ */
+#define PREFIX( str, length, ch ) \
+ *--str = ch ; length++ ; has_prefix = YES
+
+static char *conv_10(wide_int num, bool_int is_unsigned,
+ bool_int * is_negative, char *buf_end, int *len);
+SCOPE int vsnprintf(char *str, size_t size, const char *fmt, va_list ap);
+
+/*
+ * snprintf is based on SIO's Sprint.
+ *
+ * Sprint is the equivalent of printf for SIO.
+ * It returns the # of chars written
+ * Assumptions:
+ * - all floating point arguments are passed as doubles
+ */
+SCOPE int
+snprintf(char *str, size_t size, const char *fmt, ...)
+{
+ int cc;
+ va_list ap;
+
+ va_start(ap, fmt);
+ cc = vsnprintf(str, size, fmt, ap);
+ va_end(ap);
+ return cc;
+}
+
+/*
+ * Convert a floating point number to a string formats 'f', 'e' or 'E'.
+ * The result is placed in buf, and len denotes the length of the string
+ * The sign is returned in the is_negative argument (and is not placed
+ * in buf). Always add decimal point if add_dp is YES.
+ */
+static char *
+conv_fp(char format, double num, boolean_e add_dp, int precision,
+ bool_int *is_negative, char buf[], int *len)
+{
+ char *s = buf;
+ char *p;
+ int decimal_point;
+
+ if (format == 'f')
+ p = fcvt(num, precision, &decimal_point, is_negative);
+ else /* either e or E format */
+ p = ecvt(num, precision + 1, &decimal_point, is_negative);
+
+ /*
+ * Check for Infinity and NaN
+ */
+ if (isalpha(*p)) {
+ *len = strlen(strcpy(buf, p));
+ *is_negative = FALSE;
+ return (buf);
+ }
+ if (format == 'f')
+ if (decimal_point <= 0) {
+ *s++ = '0';
+ if (precision > 0) {
+ *s++ = '.';
+ while (decimal_point++ < 0)
+ *s++ = '0';
+ } else if (add_dp)
+ *s++ = '.';
+ } else {
+ while (decimal_point-- > 0)
+ *s++ = *p++;
+ if (precision > 0 || add_dp)
+ *s++ = '.';
+ } else {
+ *s++ = *p++;
+ if (precision > 0 || add_dp)
+ *s++ = '.';
+ }
+
+ /*
+ * copy the rest of p, the NUL is NOT copied
+ */
+ while (*p)
+ *s++ = *p++;
+
+ if (format != 'f') {
+ char temp[EXPONENT_LENGTH]; /* for exponent conversion */
+ int t_len;
+ bool_int exponent_is_negative;
+
+ *s++ = format; /* either e or E */
+ decimal_point--;
+ if (decimal_point != 0) {
+ p = conv_10((wide_int) decimal_point, FALSE, &exponent_is_negative,
+ &temp[EXPONENT_LENGTH], &t_len);
+ *s++ = exponent_is_negative ? '-' : '+';
+
+ /*
+ * Make sure the exponent has at least 2 digits
+ */
+ if (t_len == 1)
+ *s++ = '0';
+ while (t_len--)
+ *s++ = *p++;
+ } else {
+ *s++ = '+';
+ *s++ = '0';
+ *s++ = '0';
+ }
+ }
+ *len = s - buf;
+ return (buf);
+}
+
+/*
+ * Convert num to a base X number where X is a power of 2. nbits determines X.
+ * For example, if nbits is 3, we do base 8 conversion
+ * Return value:
+ * a pointer to a string containing the number
+ *
+ * The caller provides a buffer for the string: that is the buf_end argument
+ * which is a pointer to the END of the buffer + 1 (i.e. if the buffer
+ * is declared as buf[ 100 ], buf_end should be &buf[ 100 ])
+ */
+static char *
+conv_p2(u_wide_int num, int nbits, char format, char *buf_end, int *len)
+{
+ int mask = (1 << nbits) - 1;
+ char *p = buf_end;
+ static char low_digits[] = "0123456789abcdef";
+ static char upper_digits[] = "0123456789ABCDEF";
+ char *digits = (format == 'X') ? upper_digits : low_digits;
+
+ do {
+ *--p = digits[num & mask];
+ num >>= nbits;
+ }
+ while (num);
+
+ *len = buf_end - p;
+ return (p);
+}
+
+/*
+ * Convert num to its decimal format.
+ * Return value:
+ * - a pointer to a string containing the number (no sign)
+ * - len contains the length of the string
+ * - is_negative is set to TRUE or FALSE depending on the sign
+ * of the number (always set to FALSE if is_unsigned is TRUE)
+ *
+ * The caller provides a buffer for the string: that is the buf_end argument
+ * which is a pointer to the END of the buffer + 1 (i.e. if the buffer
+ * is declared as buf[ 100 ], buf_end should be &buf[ 100 ])
+ */
+static char *
+conv_10(wide_int num, bool_int is_unsigned, bool_int *is_negative,
+ char *buf_end, int *len)
+{
+ char *p = buf_end;
+ u_wide_int magnitude;
+
+ if (is_unsigned) {
+ magnitude = (u_wide_int) num;
+ *is_negative = FALSE;
+ } else {
+ *is_negative = (num < 0);
+
+ /*
+ * On a 2's complement machine, negating the most negative integer
+ * results in a number that cannot be represented as a signed integer.
+ * Here is what we do to obtain the number's magnitude:
+ * a. add 1 to the number
+ * b. negate it (becomes positive)
+ * c. convert it to unsigned
+ * d. add 1
+ */
+ if (*is_negative) {
+ wide_int t = num + 1;
+
+ magnitude = ((u_wide_int) - t) + 1;
+ } else
+ magnitude = (u_wide_int) num;
+ }
+
+ /*
+ * We use a do-while loop so that we write at least 1 digit
+ */
+ do {
+ register u_wide_int new_magnitude = magnitude / 10;
+
+ *--p = magnitude - new_magnitude * 10 + '0';
+ magnitude = new_magnitude;
+ }
+ while (magnitude);
+
+ *len = buf_end - p;
+ return (p);
+}
+
+/*
+ * Do format conversion.
+ */
+SCOPE int
+#if (defined(__UNIXWARE__) || defined(__OPENSERVER)) && !defined(__GNUC__)
+vsnprintf(char *str, size_t size, const char *fmt, _VA_LIST ap)
+#else
+vsnprintf(char *str, size_t size, const char *fmt, va_list ap)
+#endif
+{
+ char *sp;
+ char *bep;
+ int cc = 0;
+ int i;
+
+ char *s;
+ char *q;
+ int s_len;
+
+ int min_width;
+ int precision;
+ enum {
+ LEFT, RIGHT
+ } adjust;
+ char pad_char;
+ char prefix_char;
+
+ double fp_num;
+ wide_int i_num;
+ u_wide_int ui_num;
+
+ char num_buf[NUM_BUF_SIZE];
+ char char_buf[2]; /* for printing %% and %<unknown> */
+
+ /*
+ * Flag variables
+ */
+ boolean_e is_long;
+ boolean_e alternate_form;
+ boolean_e print_sign;
+ boolean_e print_blank;
+ boolean_e adjust_precision;
+ boolean_e adjust_width;
+ bool_int is_negative;
+
+ if (size == 0 && str != NULL)
+ return 0;
+
+ sp = str;
+ bep = str + size - 1;
+
+ while (*fmt) {
+ if (*fmt != '%') {
+ INS_CHAR(*fmt, sp, bep, cc);
+ } else {
+ /*
+ * Default variable settings
+ */
+ adjust = RIGHT;
+ alternate_form = print_sign = print_blank = NO;
+ pad_char = ' ';
+ prefix_char = NUL;
+
+ fmt++;
+
+ /*
+ * Try to avoid checking for flags, width or precision
+ */
+ if (isascii(*fmt) && !islower(*fmt)) {
+ /*
+ * Recognize flags: -, #, BLANK, +
+ */
+ for (;; fmt++) {
+ if (*fmt == '-')
+ adjust = LEFT;
+ else if (*fmt == '+')
+ print_sign = YES;
+ else if (*fmt == '#')
+ alternate_form = YES;
+ else if (*fmt == ' ')
+ print_blank = YES;
+ else if (*fmt == '0')
+ pad_char = '0';
+ else
+ break;
+ }
+
+ /*
+ * Check if a width was specified
+ */
+ if (isdigit(*fmt)) {
+ STR_TO_DEC(fmt, min_width);
+ adjust_width = YES;
+ } else if (*fmt == '*') {
+ min_width = va_arg(ap, int);
+
+ fmt++;
+ adjust_width = YES;
+ if (min_width < 0) {
+ adjust = LEFT;
+ min_width = -min_width;
+ }
+ } else
+ adjust_width = NO;
+
+ /*
+ * Check if a precision was specified
+ *
+ * XXX: an unreasonable amount of precision may be specified
+ * resulting in overflow of num_buf. Currently we
+ * ignore this possibility.
+ */
+ if (*fmt == '.') {
+ adjust_precision = YES;
+ fmt++;
+ if (isdigit(*fmt)) {
+ STR_TO_DEC(fmt, precision);
+ } else if (*fmt == '*') {
+ precision = va_arg(ap, int);
+
+ fmt++;
+ if (precision < 0)
+ precision = 0;
+ } else
+ precision = 0;
+ } else
+ adjust_precision = NO;
+ } else
+ adjust_precision = adjust_width = NO;
+
+ /*
+ * Modifier check
+ */
+ if (*fmt == 'l') {
+ is_long = YES;
+ fmt++;
+ } else
+ is_long = NO;
+
+ /*
+ * Argument extraction and printing.
+ * First we determine the argument type.
+ * Then, we convert the argument to a string.
+ * On exit from the switch, s points to the string that
+ * must be printed, s_len has the length of the string
+ * The precision requirements, if any, are reflected in s_len.
+ *
+ * NOTE: pad_char may be set to '0' because of the 0 flag.
+ * It is reset to ' ' by non-numeric formats
+ */
+ switch (*fmt) {
+ case 'd':
+ case 'i':
+ case 'u':
+ if (is_long)
+ i_num = va_arg(ap, wide_int);
+ else
+ i_num = (wide_int) va_arg(ap, int);
+
+ s = conv_10(i_num, (*fmt) == 'u', &is_negative,
+ &num_buf[NUM_BUF_SIZE], &s_len);
+ FIX_PRECISION(adjust_precision, precision, s, s_len);
+
+ if (*fmt != 'u') {
+ if (is_negative)
+ prefix_char = '-';
+ else if (print_sign)
+ prefix_char = '+';
+ else if (print_blank)
+ prefix_char = ' ';
+ }
+ break;
+
+ case 'o':
+ if (is_long)
+ ui_num = va_arg(ap, u_wide_int);
+ else
+ ui_num = (u_wide_int) va_arg(ap, unsigned int);
+
+ s = conv_p2(ui_num, 3, *fmt,
+ &num_buf[NUM_BUF_SIZE], &s_len);
+ FIX_PRECISION(adjust_precision, precision, s, s_len);
+ if (alternate_form && *s != '0') {
+ *--s = '0';
+ s_len++;
+ }
+ break;
+
+ case 'x':
+ case 'X':
+ if (is_long)
+ ui_num = (u_wide_int) va_arg(ap, u_wide_int);
+ else
+ ui_num = (u_wide_int) va_arg(ap, unsigned int);
+
+ s = conv_p2(ui_num, 4, *fmt,
+ &num_buf[NUM_BUF_SIZE], &s_len);
+ FIX_PRECISION(adjust_precision, precision, s, s_len);
+ if (alternate_form && i_num != 0) {
+ *--s = *fmt; /* 'x' or 'X' */
+ *--s = '0';
+ s_len += 2;
+ }
+ break;
+
+ case 's':
+ s = va_arg(ap, char *);
+
+ if (s != NULL) {
+ s_len = strlen(s);
+ if (adjust_precision && precision < s_len)
+ s_len = precision;
+ } else {
+ s = S_NULL;
+ s_len = S_NULL_LEN;
+ }
+ pad_char = ' ';
+ break;
+
+ case 'f':
+ case 'e':
+ case 'E':
+ fp_num = va_arg(ap, double);
+
+ s = conv_fp(*fmt, fp_num, alternate_form,
+ (adjust_precision == NO) ? FLOAT_DIGITS : precision,
+ &is_negative, &num_buf[1], &s_len);
+ if (is_negative)
+ prefix_char = '-';
+ else if (print_sign)
+ prefix_char = '+';
+ else if (print_blank)
+ prefix_char = ' ';
+ break;
+
+ case 'g':
+ case 'G':
+ if (adjust_precision == NO)
+ precision = FLOAT_DIGITS;
+ else if (precision == 0)
+ precision = 1;
+ /*
+ * We use &num_buf[ 1 ], so that we have room for the sign
+ */
+ s = gcvt(va_arg(ap, double), precision, &num_buf[1]);
+
+ if (*s == '-')
+ prefix_char = *s++;
+ else if (print_sign)
+ prefix_char = '+';
+ else if (print_blank)
+ prefix_char = ' ';
+
+ s_len = strlen(s);
+
+ if (alternate_form && (q = strchr(s, '.')) == NULL)
+ s[s_len++] = '.';
+ if (*fmt == 'G' && (q = strchr(s, 'e')) != NULL)
+ *q = 'E';
+ break;
+
+ case 'c':
+ char_buf[0] = (char)(va_arg(ap, int));
+
+ s = &char_buf[0];
+ s_len = 1;
+ pad_char = ' ';
+ break;
+
+ case '%':
+ char_buf[0] = '%';
+ s = &char_buf[0];
+ s_len = 1;
+ pad_char = ' ';
+ break;
+
+ case 'n':
+ *(va_arg(ap, int *)) = cc;
+
+ break;
+
+ /*
+ * If the pointer size is equal to the size of an unsigned
+ * integer we convert the pointer to a hex number, otherwise
+ * we print "%p" to indicate that we don't handle "%p".
+ */
+ case 'p':
+ ui_num = (u_wide_int) va_arg(ap, void *);
+
+ if (sizeof(void *) <= sizeof(u_wide_int))
+ s = conv_p2(ui_num, 4, 'x',
+ &num_buf[NUM_BUF_SIZE], &s_len);
+
+ else {
+ s = "%p";
+ s_len = 2;
+ }
+ pad_char = ' ';
+ break;
+
+ case NUL:
+ /*
+ * The last character of the format string was %.
+ * We ignore it.
+ */
+ continue;
+
+ /*
+ * The default case is for unrecognized %'s.
+ * We print %<char> to help the user identify what
+ * option is not understood.
+ * This is also useful in case the user wants to pass
+ * the output of __sio_converter to another function
+ * that understands some other %<char> (like syslog).
+ * Note that we can't point s inside fmt because the
+ * unknown <char> could be preceded by width etc.
+ */
+ default:
+ char_buf[0] = '%';
+ char_buf[1] = *fmt;
+ s = char_buf;
+ s_len = 2;
+ pad_char = ' ';
+ break;
+ }
+
+ if (prefix_char != NUL) {
+ *--s = prefix_char;
+ s_len++;
+ }
+ if (adjust_width && adjust == RIGHT && min_width > s_len) {
+ if (pad_char == '0' && prefix_char != NUL) {
+ INS_CHAR(*s, sp, bep, cc)
+ s++;
+ s_len--;
+ min_width--;
+ }
+ PAD(min_width, s_len, pad_char);
+ }
+ /*
+ * Print the string s.
+ */
+ for (i = s_len; i != 0; i--) {
+ INS_CHAR(*s, sp, bep, cc);
+ s++;
+ }
+
+ if (adjust_width && adjust == LEFT && min_width > s_len)
+ PAD(min_width, s_len, pad_char);
+ }
+ fmt++;
+ }
+ if (str != NULL) {
+ if (cc < size)
+ str[cc] = NUL;
+ else
+ str[size - 1] = NUL;
+ }
+ return cc;
+}
+
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