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Unified Diff: Modules/_decimal/libmpdec/io.c

Issue 7652: Merge C version of decimal into py3k.
Patch Set: Created 7 years, 6 months ago
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Modules/_decimal/libmpdec/io.c Sat Mar 10 18:12:20 2012 +0100
@@ -0,0 +1,1575 @@
+/*
+ * Copyright (c) 2008-2010 Stefan Krah. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+
+#include "mpdecimal.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <limits.h>
+#include <assert.h>
+#include <errno.h>
+#include <locale.h>
+#include "bits.h"
+#include "constants.h"
+#include "memory.h"
+#include "typearith.h"
+#include "io.h"
+
+
+/* This file contains functions for decimal <-> string conversions, including
+ PEP-3101 formatting for numeric types. */
+
+
+/*
+ * Work around the behavior of tolower() and strcasecmp() in certain
+ * locales. For example, in tr_TR.utf8:
+ *
+ * tolower((unsigned char)'I') == 'I'
+ *
+ * u is the exact uppercase version of l; n is strlen(l) or strlen(l)+1
+ */
+static inline int
+_mpd_strneq(const char *s, const char *l, const char *u, size_t n)
+{
+ while (--n != SIZE_MAX) {
+ if (*s != *l && *s != *u) {
+ return 0;
+ }
+ s++; u++; l++;
+ }
+
+ return 1;
+}
+
+static mpd_ssize_t
+strtoexp(const char *s)
+{
+ char *end;
+ mpd_ssize_t retval;
+
+ errno = 0;
+ retval = mpd_strtossize(s, &end, 10);
+ if (errno == 0 && !(*s != '\0' && *end == '\0'))
+ errno = EINVAL;
+
+ return retval;
+}
+
+/*
+ * Scan 'len' words. The most significant word contains 'r' digits,
+ * the remaining words are full words. Skip dpoint. The string 's' must
+ * consist of digits and an optional single decimal point at 'dpoint'.
+ */
+static void
+string_to_coeff(mpd_uint_t *data, const char *s, const char *dpoint, int r,
+ size_t len)
+{
+ int j;
+
+ if (r > 0) {
+ data[--len] = 0;
+ for (j = 0; j < r; j++, s++) {
+ if (s == dpoint) s++;
+ data[len] = 10 * data[len] + (*s - '0');
+ }
+ }
+
+ while (--len != SIZE_MAX) {
+ data[len] = 0;
+ for (j = 0; j < MPD_RDIGITS; j++, s++) {
+ if (s == dpoint) s++;
+ data[len] = 10 * data[len] + (*s - '0');
+ }
+ }
+}
+
+/*
+ * Partially verify a numeric string of the form:
+ *
+ * [cdigits][.][cdigits][eE][+-][edigits]
+ *
+ * If successful, return a pointer to the location of the first
+ * relevant coefficient digit. This digit is either non-zero or
+ * part of one of the following patterns:
+ *
+ * ["0\x00", "0.\x00", "0.E", "0.e", "0E", "0e"]
+ *
+ * The locations of a single optional dot or indicator are stored
+ * in 'dpoint' and 'exp'.
+ *
+ * The end of the string is stored in 'end'. If an indicator [eE]
+ * occurs without trailing [edigits], the condition is caught
+ * later by strtoexp().
+ */
+static const char *
+scan_dpoint_exp(const char *s, const char **dpoint, const char **exp,
+ const char **end)
+{
+ const char *coeff = NULL;
+
+ *dpoint = NULL;
+ *exp = NULL;
+ for (; *s != '\0'; s++) {
+ switch (*s) {
+ case '.':
+ if (*dpoint != NULL || *exp != NULL)
+ return NULL;
+ *dpoint = s;
+ break;
+ case 'E': case 'e':
+ if (*exp != NULL)
+ return NULL;
+ *exp = s;
+ if (*(s+1) == '+' || *(s+1) == '-')
+ s++;
+ break;
+ default:
+ if (!isdigit((uchar)*s))
+ return NULL;
+ if (coeff == NULL && *exp == NULL) {
+ if (*s == '0') {
+ if (!isdigit((uchar)*(s+1)))
+ if (!(*(s+1) == '.' &&
+ isdigit((uchar)*(s+2))))
+ coeff = s;
+ }
+ else {
+ coeff = s;
+ }
+ }
+ break;
+
+ }
+ }
+
+ *end = s;
+ return coeff;
+}
+
+/* scan the payload of a NaN */
+static const char *
+scan_payload(const char *s, const char **end)
+{
+ const char *coeff;
+
+ while (*s == '0')
+ s++;
+ coeff = s;
+
+ while (isdigit((uchar)*s))
+ s++;
+ *end = s;
+
+ return (*s == '\0') ? coeff : NULL;
+}
+
+/* convert a character string to a decimal */
+void
+mpd_qset_string(mpd_t *dec, const char *s, const mpd_context_t *ctx,
+ uint32_t *status)
+{
+ mpd_ssize_t q, r, len;
+ const char *coeff, *end;
+ const char *dpoint = NULL, *exp = NULL;
+ size_t digits;
+ uint8_t sign = MPD_POS;
+
+ mpd_set_flags(dec, 0);
+ dec->len = 0;
+ dec->exp = 0;
+
+ /* sign */
+ if (*s == '+') {
+ s++;
+ }
+ else if (*s == '-') {
+ mpd_set_negative(dec);
+ sign = MPD_NEG;
+ s++;
+ }
+
+ if (_mpd_strneq(s, "nan", "NAN", 3)) { /* NaN */
+ s += 3;
+ mpd_setspecial(dec, sign, MPD_NAN);
+ if (*s == '\0')
+ return;
+ /* validate payload: digits only */
+ if ((coeff = scan_payload(s, &end)) == NULL)
+ goto conversion_error;
+ /* payload consists entirely of zeros */
+ if (*coeff == '\0')
+ return;
+ digits = end - coeff;
+ /* prec >= 1, clamp is 0 or 1 */
+ if (digits > (size_t)(ctx->prec-ctx->clamp))
+ goto conversion_error;
+ } /* sNaN */
+ else if (_mpd_strneq(s, "snan", "SNAN", 4)) {
+ s += 4;
+ mpd_setspecial(dec, sign, MPD_SNAN);
+ if (*s == '\0')
+ return;
+ /* validate payload: digits only */
+ if ((coeff = scan_payload(s, &end)) == NULL)
+ goto conversion_error;
+ /* payload consists entirely of zeros */
+ if (*coeff == '\0')
+ return;
+ digits = end - coeff;
+ if (digits > (size_t)(ctx->prec-ctx->clamp))
+ goto conversion_error;
+ }
+ else if (_mpd_strneq(s, "inf", "INF", 3)) {
+ s += 3;
+ if (*s == '\0' || _mpd_strneq(s, "inity", "INITY", 6)) {
+ /* numeric-value: infinity */
+ mpd_setspecial(dec, sign, MPD_INF);
+ return;
+ }
+ goto conversion_error;
+ }
+ else {
+ /* scan for start of coefficient, decimal point, indicator, end */
+ if ((coeff = scan_dpoint_exp(s, &dpoint, &exp, &end)) == NULL)
+ goto conversion_error;
+
+ /* numeric-value: [exponent-part] */
+ if (exp) {
+ /* exponent-part */
+ end = exp; exp++;
+ dec->exp = strtoexp(exp);
+ if (errno) {
+ if (!(errno == ERANGE &&
+ (dec->exp == MPD_SSIZE_MAX ||
+ dec->exp == MPD_SSIZE_MIN)))
+ goto conversion_error;
+ }
+ }
+
+ digits = end - coeff;
+ if (dpoint) {
+ size_t fracdigits = end-dpoint-1;
+ if (dpoint > coeff) digits--;
+
+ if (fracdigits > MPD_MAX_PREC) {
+ goto conversion_error;
+ }
+ if (dec->exp < MPD_SSIZE_MIN+(mpd_ssize_t)fracdigits) {
+ dec->exp = MPD_SSIZE_MIN;
+ }
+ else {
+ dec->exp -= (mpd_ssize_t)fracdigits;
+ }
+ }
+ if (digits > MPD_MAX_PREC) {
+ goto conversion_error;
+ }
+ if (dec->exp > MPD_EXP_INF) {
+ dec->exp = MPD_EXP_INF;
+ }
+ if (dec->exp == MPD_SSIZE_MIN) {
+ dec->exp = MPD_SSIZE_MIN+1;
+ }
+ }
+
+ _mpd_idiv_word(&q, &r, (mpd_ssize_t)digits, MPD_RDIGITS);
+
+ len = (r == 0) ? q : q+1;
+ if (len == 0) {
+ goto conversion_error; /* GCOV_NOT_REACHED */
+ }
+ if (!mpd_qresize(dec, len, status)) {
+ mpd_seterror(dec, MPD_Malloc_error, status);
+ return;
+ }
+ dec->len = len;
+
+ string_to_coeff(dec->data, coeff, dpoint, (int)r, len);
+
+ mpd_setdigits(dec);
+ mpd_qfinalize(dec, ctx, status);
+ return;
+
+conversion_error:
+ /* standard wants a positive NaN */
+ mpd_seterror(dec, MPD_Conversion_syntax, status);
+}
+
+/* Print word x with n decimal digits to string s. dot is either NULL
+ or the location of a decimal point. */
+#define EXTRACT_DIGIT(s, x, d, dot) \
+ if (s == dot) *s++ = '.'; *s++ = '0' + (char)(x / d); x %= d
+static inline char *
+word_to_string(char *s, mpd_uint_t x, int n, char *dot)
+{
+ switch(n) {
+#ifdef CONFIG_64
+ case 20: EXTRACT_DIGIT(s, x, 10000000000000000000ULL, dot); /* GCOV_NOT_REACHED */
+ case 19: EXTRACT_DIGIT(s, x, 1000000000000000000ULL, dot);
+ case 18: EXTRACT_DIGIT(s, x, 100000000000000000ULL, dot);
+ case 17: EXTRACT_DIGIT(s, x, 10000000000000000ULL, dot);
+ case 16: EXTRACT_DIGIT(s, x, 1000000000000000ULL, dot);
+ case 15: EXTRACT_DIGIT(s, x, 100000000000000ULL, dot);
+ case 14: EXTRACT_DIGIT(s, x, 10000000000000ULL, dot);
+ case 13: EXTRACT_DIGIT(s, x, 1000000000000ULL, dot);
+ case 12: EXTRACT_DIGIT(s, x, 100000000000ULL, dot);
+ case 11: EXTRACT_DIGIT(s, x, 10000000000ULL, dot);
+#endif
+ case 10: EXTRACT_DIGIT(s, x, 1000000000UL, dot);
+ case 9: EXTRACT_DIGIT(s, x, 100000000UL, dot);
+ case 8: EXTRACT_DIGIT(s, x, 10000000UL, dot);
+ case 7: EXTRACT_DIGIT(s, x, 1000000UL, dot);
+ case 6: EXTRACT_DIGIT(s, x, 100000UL, dot);
+ case 5: EXTRACT_DIGIT(s, x, 10000UL, dot);
+ case 4: EXTRACT_DIGIT(s, x, 1000UL, dot);
+ case 3: EXTRACT_DIGIT(s, x, 100UL, dot);
+ case 2: EXTRACT_DIGIT(s, x, 10UL, dot);
+ default: if (s == dot) *s++ = '.'; *s++ = '0' + (char)x;
+ }
+
+ *s = '\0';
+ return s;
+}
+
+/* Print exponent x to string s. Undefined for MPD_SSIZE_MIN. */
+static inline char *
+exp_to_string(char *s, mpd_ssize_t x)
+{
+ char sign = '+';
+
+ if (x < 0) {
+ sign = '-';
+ x = -x;
+ }
+ *s++ = sign;
+
+ return word_to_string(s, x, mpd_word_digits(x), NULL);
+}
+
+/* Print the coefficient of dec to string s. len(dec) > 0. */
+static inline char *
+coeff_to_string(char *s, const mpd_t *dec)
+{
+ mpd_uint_t x;
+ mpd_ssize_t i;
+
+ /* most significant word */
+ x = mpd_msword(dec);
+ s = word_to_string(s, x, mpd_word_digits(x), NULL);
+
+ /* remaining full words */
+ for (i=dec->len-2; i >= 0; --i) {
+ x = dec->data[i];
+ s = word_to_string(s, x, MPD_RDIGITS, NULL);
+ }
+
+ return s;
+}
+
+/* Print the coefficient of dec to string s. len(dec) > 0. dot is either
+ NULL or a pointer to the location of a decimal point. */
+static inline char *
+coeff_to_string_dot(char *s, char *dot, const mpd_t *dec)
+{
+ mpd_uint_t x;
+ mpd_ssize_t i;
+
+ /* most significant word */
+ x = mpd_msword(dec);
+ s = word_to_string(s, x, mpd_word_digits(x), dot);
+
+ /* remaining full words */
+ for (i=dec->len-2; i >= 0; --i) {
+ x = dec->data[i];
+ s = word_to_string(s, x, MPD_RDIGITS, dot);
+ }
+
+ return s;
+}
+
+/* Format type */
+#define MPD_FMT_LOWER 0x00000000
+#define MPD_FMT_UPPER 0x00000001
+#define MPD_FMT_TOSCI 0x00000002
+#define MPD_FMT_TOENG 0x00000004
+#define MPD_FMT_EXP 0x00000008
+#define MPD_FMT_FIXED 0x00000010
+#define MPD_FMT_PERCENT 0x00000020
+#define MPD_FMT_SIGN_SPACE 0x00000040
+#define MPD_FMT_SIGN_PLUS 0x00000080
+
+/* Default place of the decimal point for MPD_FMT_TOSCI, MPD_FMT_EXP */
+#define MPD_DEFAULT_DOTPLACE 1
+
+/*
+ * Set *result to the string representation of a decimal. Return the length
+ * of *result, not including the terminating '\0' character.
+ *
+ * Formatting is done according to 'flags'. A return value of -1 with *result
+ * set to NULL indicates MPD_Malloc_error.
+ *
+ * 'dplace' is the default place of the decimal point. It is always set to
+ * MPD_DEFAULT_DOTPLACE except for zeros in combination with MPD_FMT_EXP.
+ */
+static mpd_ssize_t
+_mpd_to_string(char **result, const mpd_t *dec, int flags, mpd_ssize_t dplace)
+{
+ char *decstring = NULL, *cp = NULL;
+ mpd_ssize_t ldigits;
+ mpd_ssize_t mem = 0, k;
+
+ if (mpd_isspecial(dec)) {
+
+ mem = sizeof "-Infinity";
+ if (mpd_isnan(dec) && dec->len > 0) {
+ /* diagnostic code */
+ mem += dec->digits;
+ }
+ cp = decstring = mpd_alloc(mem, sizeof *decstring);
+ if (cp == NULL) {
+ *result = NULL;
+ return -1;
+ }
+
+ if (mpd_isnegative(dec)) {
+ *cp++ = '-';
+ }
+ else if (flags&MPD_FMT_SIGN_SPACE) {
+ *cp++ = ' ';
+ }
+ else if (flags&MPD_FMT_SIGN_PLUS) {
+ *cp++ = '+';
+ }
+
+ if (mpd_isnan(dec)) {
+ if (mpd_isqnan(dec)) {
+ strcpy(cp, "NaN");
+ cp += 3;
+ }
+ else {
+ strcpy(cp, "sNaN");
+ cp += 4;
+ }
+ if (dec->len > 0) { /* diagnostic code */
+ cp = coeff_to_string(cp, dec);
+ }
+ }
+ else if (mpd_isinfinite(dec)) {
+ strcpy(cp, "Infinity");
+ cp += 8;
+ }
+ else { /* debug */
+ abort(); /* GCOV_NOT_REACHED */
+ }
+ }
+ else {
+ assert(dec->len > 0);
+
+ /*
+ * For easier manipulation of the decimal point's location
+ * and the exponent that is finally printed, the number is
+ * rescaled to a virtual representation with exp = 0. Here
+ * ldigits denotes the number of decimal digits to the left
+ * of the decimal point and remains constant once initialized.
+ *
+ * dplace is the location of the decimal point relative to
+ * the start of the coefficient. Note that 3) always holds
+ * when dplace is shifted.
+ *
+ * 1) ldigits := dec->digits - dec->exp
+ * 2) dplace := ldigits (initially)
+ * 3) exp := ldigits - dplace (initially exp = 0)
+ *
+ * 0.00000_.____._____000000.
+ * ^ ^ ^ ^
+ * | | | |
+ * | | | `- dplace >= digits
+ * | | `- dplace in the middle of the coefficient
+ * | ` dplace = 1 (after the first coefficient digit)
+ * `- dplace <= 0
+ */
+
+ ldigits = dec->digits + dec->exp;
+
+ if (flags&MPD_FMT_EXP) {
+ ;
+ }
+ else if (flags&MPD_FMT_FIXED || (dec->exp <= 0 && ldigits > -6)) {
+ /* MPD_FMT_FIXED: always use fixed point notation.
+ * MPD_FMT_TOSCI, MPD_FMT_TOENG: for a certain range,
+ * override exponent notation. */
+ dplace = ldigits;
+ }
+ else if (flags&MPD_FMT_TOENG) {
+ if (mpd_iszero(dec)) {
+ /* If the exponent is divisible by three,
+ * dplace = 1. Otherwise, move dplace one
+ * or two places to the left. */
+ dplace = -1 + mod_mpd_ssize_t(dec->exp+2, 3);
+ }
+ else { /* ldigits-1 is the adjusted exponent, which
+ * should be divisible by three. If not, move
+ * dplace one or two places to the right. */
+ dplace += mod_mpd_ssize_t(ldigits-1, 3);
+ }
+ }
+
+ /*
+ * Basic space requirements:
+ *
+ * [-][.][coeffdigits][E][-][expdigits+1][%]['\0']
+ *
+ * If the decimal point lies outside of the coefficient digits,
+ * space is adjusted accordingly.
+ */
+ if (dplace <= 0) {
+ mem = -dplace + dec->digits + 2;
+ }
+ else if (dplace >= dec->digits) {
+ mem = dplace;
+ }
+ else {
+ mem = dec->digits;
+ }
+ mem += (MPD_EXPDIGITS+1+6);
+
+ cp = decstring = mpd_alloc(mem, sizeof *decstring);
+ if (cp == NULL) {
+ *result = NULL;
+ return -1;
+ }
+
+
+ if (mpd_isnegative(dec)) {
+ *cp++ = '-';
+ }
+ else if (flags&MPD_FMT_SIGN_SPACE) {
+ *cp++ = ' ';
+ }
+ else if (flags&MPD_FMT_SIGN_PLUS) {
+ *cp++ = '+';
+ }
+
+ if (dplace <= 0) {
+ /* space: -dplace+dec->digits+2 */
+ *cp++ = '0';
+ *cp++ = '.';
+ for (k = 0; k < -dplace; k++) {
+ *cp++ = '0';
+ }
+ cp = coeff_to_string(cp, dec);
+ }
+ else if (dplace >= dec->digits) {
+ /* space: dplace */
+ cp = coeff_to_string(cp, dec);
+ for (k = 0; k < dplace-dec->digits; k++) {
+ *cp++ = '0';
+ }
+ }
+ else {
+ /* space: dec->digits+1 */
+ cp = coeff_to_string_dot(cp, cp+dplace, dec);
+ }
+
+ /*
+ * Conditions for printing an exponent:
+ *
+ * MPD_FMT_TOSCI, MPD_FMT_TOENG: only if ldigits != dplace
+ * MPD_FMT_FIXED: never (ldigits == dplace)
+ * MPD_FMT_EXP: always
+ */
+ if (ldigits != dplace || flags&MPD_FMT_EXP) {
+ /* space: expdigits+2 */
+ *cp++ = (flags&MPD_FMT_UPPER) ? 'E' : 'e';
+ cp = exp_to_string(cp, ldigits-dplace);
+ }
+
+ if (flags&MPD_FMT_PERCENT) {
+ *cp++ = '%';
+ }
+ }
+
+ assert(cp < decstring+mem);
+ assert(cp-decstring < MPD_SSIZE_MAX);
+
+ *cp = '\0';
+ *result = decstring;
+ return (mpd_ssize_t)(cp-decstring);
+}
+
+char *
+mpd_to_sci(const mpd_t *dec, int fmt)
+{
+ char *res;
+ int flags = MPD_FMT_TOSCI;
+
+ flags |= fmt ? MPD_FMT_UPPER : MPD_FMT_LOWER;
+ (void)_mpd_to_string(&res, dec, flags, MPD_DEFAULT_DOTPLACE);
+ return res;
+}
+
+char *
+mpd_to_eng(const mpd_t *dec, int fmt)
+{
+ char *res;
+ int flags = MPD_FMT_TOENG;
+
+ flags |= fmt ? MPD_FMT_UPPER : MPD_FMT_LOWER;
+ (void)_mpd_to_string(&res, dec, flags, MPD_DEFAULT_DOTPLACE);
+ return res;
+}
+
+mpd_ssize_t
+mpd_to_sci_size(char **res, const mpd_t *dec, int fmt)
+{
+ int flags = MPD_FMT_TOSCI;
+
+ flags |= fmt ? MPD_FMT_UPPER : MPD_FMT_LOWER;
+ return _mpd_to_string(res, dec, flags, MPD_DEFAULT_DOTPLACE);
+}
+
+mpd_ssize_t
+mpd_to_eng_size(char **res, const mpd_t *dec, int fmt)
+{
+ int flags = MPD_FMT_TOENG;
+
+ flags |= fmt ? MPD_FMT_UPPER : MPD_FMT_LOWER;
+ return _mpd_to_string(res, dec, flags, MPD_DEFAULT_DOTPLACE);
+}
+
+/* Copy a single UTF-8 char to dest. See: The Unicode Standard, version 5.2,
+ chapter 3.9: Well-formed UTF-8 byte sequences. */
+static int
+_mpd_copy_utf8(char dest[5], const char *s)
+{
+ const uchar *cp = (const uchar *)s;
+ uchar lb, ub;
+ int count, i;
+
+
+ if (*cp == 0) {
+ /* empty string */
+ dest[0] = '\0';
+ return 0;
+ }
+ else if (*cp <= 0x7f) {
+ /* ascii */
+ dest[0] = *cp;
+ dest[1] = '\0';
+ return 1;
+ }
+ else if (0xc2 <= *cp && *cp <= 0xdf) {
+ lb = 0x80; ub = 0xbf;
+ count = 2;
+ }
+ else if (*cp == 0xe0) {
+ lb = 0xa0; ub = 0xbf;
+ count = 3;
+ }
+ else if (*cp <= 0xec) {
+ lb = 0x80; ub = 0xbf;
+ count = 3;
+ }
+ else if (*cp == 0xed) {
+ lb = 0x80; ub = 0x9f;
+ count = 3;
+ }
+ else if (*cp <= 0xef) {
+ lb = 0x80; ub = 0xbf;
+ count = 3;
+ }
+ else if (*cp == 0xf0) {
+ lb = 0x90; ub = 0xbf;
+ count = 4;
+ }
+ else if (*cp <= 0xf3) {
+ lb = 0x80; ub = 0xbf;
+ count = 4;
+ }
+ else if (*cp == 0xf4) {
+ lb = 0x80; ub = 0x8f;
+ count = 4;
+ }
+ else {
+ /* invalid */
+ goto error;
+ }
+
+ dest[0] = *cp++;
+ if (*cp < lb || ub < *cp) {
+ goto error;
+ }
+ dest[1] = *cp++;
+ for (i = 2; i < count; i++) {
+ if (*cp < 0x80 || 0xbf < *cp) {
+ goto error;
+ }
+ dest[i] = *cp++;
+ }
+ dest[i] = '\0';
+
+ return count;
+
+error:
+ dest[0] = '\0';
+ return -1;
+}
+
+int
+mpd_validate_lconv(mpd_spec_t *spec)
+{
+ size_t n;
+#if CHAR_MAX == SCHAR_MAX
+ const char *cp = spec->grouping;
+ while (*cp != '\0') {
+ if (*cp++ < 0) {
+ return -1;
+ }
+ }
+#endif
+ n = strlen(spec->dot);
+ if (n == 0 || n > 4) {
+ return -1;
+ }
+ if (strlen(spec->sep) > 4) {
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+mpd_parse_fmt_str(mpd_spec_t *spec, const char *fmt, int caps)
+{
+ char *cp = (char *)fmt;
+ int have_align = 0, n;
+
+ /* defaults */
+ spec->min_width = 0;
+ spec->prec = -1;
+ spec->type = caps ? 'G' : 'g';
+ spec->align = '>';
+ spec->sign = '-';
+ spec->dot = "";
+ spec->sep = "";
+ spec->grouping = "";
+
+
+ /* presume that the first character is a UTF-8 fill character */
+ if ((n = _mpd_copy_utf8(spec->fill, cp)) < 0) {
+ return 0;
+ }
+
+ /* alignment directive, prefixed by a fill character */
+ if (*cp && (*(cp+n) == '<' || *(cp+n) == '>' ||
+ *(cp+n) == '=' || *(cp+n) == '^')) {
+ cp += n;
+ spec->align = *cp++;
+ have_align = 1;
+ } /* alignment directive */
+ else {
+ /* default fill character */
+ spec->fill[0] = ' ';
+ spec->fill[1] = '\0';
+ if (*cp == '<' || *cp == '>' ||
+ *cp == '=' || *cp == '^') {
+ spec->align = *cp++;
+ have_align = 1;
+ }
+ }
+
+ /* sign formatting */
+ if (*cp == '+' || *cp == '-' || *cp == ' ') {
+ spec->sign = *cp++;
+ }
+
+ /* zero padding */
+ if (*cp == '0') {
+ /* zero padding implies alignment, which should not be
+ * specified twice. */
+ if (have_align) {
+ return 0;
+ }
+ spec->align = 'z';
+ spec->fill[0] = *cp++;
+ spec->fill[1] = '\0';
+ }
+
+ /* minimum width */
+ if (isdigit((uchar)*cp)) {
+ if (*cp == '0') {
+ return 0;
+ }
+ errno = 0;
+ spec->min_width = mpd_strtossize(cp, &cp, 10);
+ if (errno == ERANGE || errno == EINVAL) {
+ return 0;
+ }
+ }
+
+ /* thousands separator */
+ if (*cp == ',') {
+ spec->dot = ".";
+ spec->sep = ",";
+ spec->grouping = "\003\003";
+ cp++;
+ }
+
+ /* fraction digits or significant digits */
+ if (*cp == '.') {
+ cp++;
+ if (!isdigit((uchar)*cp)) {
+ return 0;
+ }
+ errno = 0;
+ spec->prec = mpd_strtossize(cp, &cp, 10);
+ if (errno == ERANGE || errno == EINVAL) {
+ return 0;
+ }
+ }
+
+ /* type */
+ if (*cp == 'E' || *cp == 'e' || *cp == 'F' || *cp == 'f' ||
+ *cp == 'G' || *cp == 'g' || *cp == '%') {
+ spec->type = *cp++;
+ }
+ else if (*cp == 'N' || *cp == 'n') {
+ /* locale specific conversion */
+ struct lconv *lc;
+ /* separator has already been specified */
+ if (*spec->sep) {
+ return 0;
+ }
+ spec->type = *cp++;
+ spec->type = (spec->type == 'N') ? 'G' : 'g';
+ lc = localeconv();
+ spec->dot = lc->decimal_point;
+ spec->sep = lc->thousands_sep;
+ spec->grouping = lc->grouping;
+ if (mpd_validate_lconv(spec) < 0) {
+ return 0;
+ }
+ }
+
+ /* check correctness */
+ if (*cp != '\0') {
+ return 0;
+ }
+
+ return 1;
+}
+
+/*
+ * The following functions assume that spec->min_width <= MPD_MAX_PREC, which
+ * is made sure in mpd_qformat_spec. Then, even with a spec that inserts a
+ * four-byte separator after each digit, nbytes in the following struct
+ * cannot overflow.
+ */
+
+/* Multibyte string */
+typedef struct {
+ mpd_ssize_t nbytes; /* length in bytes */
+ mpd_ssize_t nchars; /* length in chars */
+ mpd_ssize_t cur; /* current write index */
+ char *data;
+} mpd_mbstr_t;
+
+static inline void
+_mpd_bcopy(char *dest, const char *src, mpd_ssize_t n)
+{
+ while (--n >= 0) {
+ dest[n] = src[n];
+ }
+}
+
+static inline void
+_mbstr_copy_char(mpd_mbstr_t *dest, const char *src, mpd_ssize_t n)
+{
+ dest->nbytes += n;
+ dest->nchars += (n > 0 ? 1 : 0);
+ dest->cur -= n;
+
+ if (dest->data != NULL) {
+ _mpd_bcopy(dest->data+dest->cur, src, n);
+ }
+}
+
+static inline void
+_mbstr_copy_ascii(mpd_mbstr_t *dest, const char *src, mpd_ssize_t n)
+{
+ dest->nbytes += n;
+ dest->nchars += n;
+ dest->cur -= n;
+
+ if (dest->data != NULL) {
+ _mpd_bcopy(dest->data+dest->cur, src, n);
+ }
+}
+
+static inline void
+_mbstr_copy_pad(mpd_mbstr_t *dest, mpd_ssize_t n)
+{
+ dest->nbytes += n;
+ dest->nchars += n;
+ dest->cur -= n;
+
+ if (dest->data != NULL) {
+ char *cp = dest->data + dest->cur;
+ while (--n >= 0) {
+ cp[n] = '0';
+ }
+ }
+}
+
+/*
+ * Copy a numeric string to dest->data, adding separators in the integer
+ * part according to spec->grouping. If leading zero padding is enabled
+ * and the result is smaller than spec->min_width, continue adding zeros
+ * and separators until the minimum width is reached.
+ *
+ * The final length of dest->data is stored in dest->nbytes. The number
+ * of UTF-8 characters is stored in dest->nchars.
+ *
+ * First run (dest->data == NULL): determine the length of the result
+ * string and store it in dest->nbytes.
+ *
+ * Second run (write to dest->data): data is written in chunks and in
+ * reverse order, starting with the rest of the numeric string.
+ */
+static void
+_mpd_add_sep_dot(mpd_mbstr_t *dest,
+ const char *sign, /* location of optional sign */
+ const char *src, mpd_ssize_t n_src, /* integer part and length */
+ const char *dot, /* location of optional decimal point */
+ const char *rest, mpd_ssize_t n_rest, /* remaining part and length */
+ const mpd_spec_t *spec)
+{
+ mpd_ssize_t n_sep, n_sign, consume;
+ const char *g;
+ int pad = 0;
+
+ n_sign = sign ? 1 : 0;
+ n_sep = (mpd_ssize_t)strlen(spec->sep);
+ /* Initial write index: set to location of '\0' in the output string.
+ * Irrelevant for the first run. */
+ dest->cur = dest->nbytes;
+ dest->nbytes = dest->nchars = 0;
+
+ _mbstr_copy_ascii(dest, rest, n_rest);
+
+ if (dot) {
+ _mbstr_copy_char(dest, dot, (mpd_ssize_t)strlen(dot));
+ }
+
+ g = spec->grouping;
+ consume = *g;
+ while (1) {
+ /* If the group length is 0 or CHAR_MAX or greater than the
+ * number of source bytes, consume all remaining bytes. */
+ if (*g == 0 || *g == CHAR_MAX || consume > n_src) {
+ consume = n_src;
+ }
+ n_src -= consume;
+ if (pad) {
+ _mbstr_copy_pad(dest, consume);
+ }
+ else {
+ _mbstr_copy_ascii(dest, src+n_src, consume);
+ }
+
+ if (n_src == 0) {
+ /* Either the real source of intpart digits or the virtual
+ * source of padding zeros is exhausted. */
+ if (spec->align == 'z' &&
+ dest->nchars + n_sign < spec->min_width) {
+ /* Zero padding is set and length < min_width:
+ * Generate n_src additional characters. */
+ n_src = spec->min_width - (dest->nchars + n_sign);
+ /* Next iteration:
+ * case *g == 0 || *g == CHAR_MAX:
+ * consume all padding characters
+ * case consume < g*:
+ * fill remainder of current group
+ * case consume == g*
+ * copying is a no-op */
+ consume = *g - consume;
+ /* Switch on virtual source of zeros. */
+ pad = 1;
+ continue;
+ }
+ break;
+ }
+
+ if (n_sep > 0) {
+ /* If padding is switched on, separators are counted
+ * as padding characters. This rule does not apply if
+ * the separator would be the first character of the
+ * result string. */
+ if (pad && n_src > 1) n_src -= 1;
+ _mbstr_copy_char(dest, spec->sep, n_sep);
+ }
+
+ /* If non-NUL, use the next value for grouping. */
+ if (*g && *(g+1)) g++;
+ consume = *g;
+ }
+
+ if (sign) {
+ _mbstr_copy_ascii(dest, sign, 1);
+ }
+
+ if (dest->data) {
+ dest->data[dest->nbytes] = '\0';
+ }
+}
+
+/*
+ * Convert a numeric-string to its locale-specific appearance.
+ * The string must have one of these forms:
+ *
+ * 1) [sign] digits [exponent-part]
+ * 2) [sign] digits '.' [digits] [exponent-part]
+ *
+ * Not allowed, since _mpd_to_string() never returns this form:
+ *
+ * 3) [sign] '.' digits [exponent-part]
+ *
+ * Input: result->data := original numeric string (ASCII)
+ * result->bytes := strlen(result->data)
+ * result->nchars := strlen(result->data)
+ *
+ * Output: result->data := modified or original string
+ * result->bytes := strlen(result->data)
+ * result->nchars := number of characters (possibly UTF-8)
+ */
+static int
+_mpd_apply_lconv(mpd_mbstr_t *result, const mpd_spec_t *spec, uint32_t *status)
+{
+ const char *sign = NULL, *intpart = NULL, *dot = NULL;
+ const char *rest, *dp;
+ char *decstring;
+ mpd_ssize_t n_int, n_rest;
+
+ /* original numeric string */
+ dp = result->data;
+
+ /* sign */
+ if (*dp == '+' || *dp == '-' || *dp == ' ') {
+ sign = dp++;
+ }
+ /* integer part */
+ assert(isdigit((uchar)*dp));
+ intpart = dp++;
+ while (isdigit((uchar)*dp)) {
+ dp++;
+ }
+ n_int = (mpd_ssize_t)(dp-intpart);
+ /* decimal point */
+ if (*dp == '.') {
+ dp++; dot = spec->dot;
+ }
+ /* rest */
+ rest = dp;
+ n_rest = result->nbytes - (mpd_ssize_t)(dp-result->data);
+
+ if (dot == NULL && (*spec->sep == '\0' || *spec->grouping == '\0')) {
+ /* _mpd_add_sep_dot() would not change anything */
+ return 1;
+ }
+
+ /* Determine the size of the new decimal string after inserting the
+ * decimal point, optional separators and optional padding. */
+ decstring = result->data;
+ result->data = NULL;
+ _mpd_add_sep_dot(result, sign, intpart, n_int, dot,
+ rest, n_rest, spec);
+
+ result->data = mpd_alloc(result->nbytes+1, 1);
+ if (result->data == NULL) {
+ *status |= MPD_Malloc_error;
+ mpd_free(decstring);
+ return 0;
+ }
+
+ /* Perform actual writes. */
+ _mpd_add_sep_dot(result, sign, intpart, n_int, dot,
+ rest, n_rest, spec);
+
+ mpd_free(decstring);
+ return 1;
+}
+
+/* Add padding to the formatted string if necessary. */
+static int
+_mpd_add_pad(mpd_mbstr_t *result, const mpd_spec_t *spec, uint32_t *status)
+{
+ if (result->nchars < spec->min_width) {
+ mpd_ssize_t add_chars, add_bytes;
+ size_t lpad = 0, rpad = 0;
+ size_t n_fill, len, i, j;
+ char align = spec->align;
+ uint8_t err = 0;
+ char *cp;
+
+ n_fill = strlen(spec->fill);
+ add_chars = (spec->min_width - result->nchars);
+ /* max value: MPD_MAX_PREC * 4 */
+ add_bytes = add_chars * (mpd_ssize_t)n_fill;
+
+ cp = result->data = mpd_realloc(result->data,
+ result->nbytes+add_bytes+1,
+ sizeof *result->data, &err);
+ if (err) {
+ *status |= MPD_Malloc_error;
+ mpd_free(result->data);
+ return 0;
+ }
+
+ if (align == 'z') {
+ align = '=';
+ }
+
+ if (align == '<') {
+ rpad = add_chars;
+ }
+ else if (align == '>' || align == '=') {
+ lpad = add_chars;
+ }
+ else { /* align == '^' */
+ lpad = add_chars/2;
+ rpad = add_chars-lpad;
+ }
+
+ len = result->nbytes;
+ if (align == '=' && (*cp == '-' || *cp == '+' || *cp == ' ')) {
+ /* leave sign in the leading position */
+ cp++; len--;
+ }
+
+ memmove(cp+n_fill*lpad, cp, len);
+ for (i = 0; i < lpad; i++) {
+ for (j = 0; j < n_fill; j++) {
+ cp[i*n_fill+j] = spec->fill[j];
+ }
+ }
+ cp += (n_fill*lpad + len);
+ for (i = 0; i < rpad; i++) {
+ for (j = 0; j < n_fill; j++) {
+ cp[i*n_fill+j] = spec->fill[j];
+ }
+ }
+
+ result->nbytes += add_bytes;
+ result->nchars += add_chars;
+ result->data[result->nbytes] = '\0';
+ }
+
+ return 1;
+}
+
+/* Round a number to prec digits. The adjusted exponent stays the same
+ or increases by one if rounding up crosses a power of ten boundary.
+ If result->digits would exceed MPD_MAX_PREC+1, MPD_Invalid_operation
+ is set and the result is NaN. */
+static inline void
+_mpd_round(mpd_t *result, const mpd_t *a, mpd_ssize_t prec,
+ const mpd_context_t *ctx, uint32_t *status)
+{
+ mpd_ssize_t exp = a->exp + a->digits - prec;
+
+ if (prec <= 0) {
+ mpd_seterror(result, MPD_Invalid_operation, status); /* GCOV_NOT_REACHED */
+ return; /* GCOV_NOT_REACHED */
+ }
+ if (mpd_isspecial(a) || mpd_iszero(a)) {
+ mpd_qcopy(result, a, status); /* GCOV_NOT_REACHED */
+ return; /* GCOV_NOT_REACHED */
+ }
+
+ mpd_qrescale_fmt(result, a, exp, ctx, status);
+ if (result->digits > prec) {
+ mpd_qrescale_fmt(result, result, exp+1, ctx, status);
+ }
+}
+
+/*
+ * Return the string representation of an mpd_t, formatted according to 'spec'.
+ * The format specification is assumed to be valid. Memory errors are indicated
+ * as usual. This function is quiet.
+ */
+char *
+mpd_qformat_spec(const mpd_t *dec, const mpd_spec_t *spec,
+ const mpd_context_t *ctx, uint32_t *status)
+{
+ mpd_uint_t dt[MPD_MINALLOC_MAX];
+ mpd_t tmp = {MPD_STATIC|MPD_STATIC_DATA,0,0,0,MPD_MINALLOC_MAX,dt};
+ mpd_ssize_t dplace = MPD_DEFAULT_DOTPLACE;
+ mpd_mbstr_t result;
+ mpd_spec_t stackspec;
+ char type = spec->type;
+ int flags = 0;
+
+
+ if (spec->min_width > MPD_MAX_PREC) {
+ *status |= MPD_Invalid_operation;
+ return NULL;
+ }
+
+ if (isupper((uchar)type)) {
+ type = tolower((uchar)type);
+ flags |= MPD_FMT_UPPER;
+ }
+ if (spec->sign == ' ') {
+ flags |= MPD_FMT_SIGN_SPACE;
+ }
+ else if (spec->sign == '+') {
+ flags |= MPD_FMT_SIGN_PLUS;
+ }
+
+ if (mpd_isspecial(dec)) {
+ if (spec->align == 'z') {
+ stackspec = *spec;
+ stackspec.fill[0] = ' ';
+ stackspec.fill[1] = '\0';
+ stackspec.align = '>';
+ spec = &stackspec;
+ }
+ }
+ else {
+ uint32_t workstatus = 0;
+ mpd_ssize_t prec;
+
+ switch (type) {
+ case 'g': flags |= MPD_FMT_TOSCI; break;
+ case 'e': flags |= MPD_FMT_EXP; break;
+ case '%': flags |= MPD_FMT_PERCENT;
+ if (!mpd_qcopy(&tmp, dec, status)) {
+ return NULL;
+ }
+ tmp.exp += 2;
+ dec = &tmp;
+ type = 'f'; /* fall through */
+ case 'f': flags |= MPD_FMT_FIXED; break;
+ default: abort(); /* debug: GCOV_NOT_REACHED */
+ }
+
+ if (spec->prec >= 0) {
+ if (spec->prec > MPD_MAX_PREC) {
+ *status |= MPD_Invalid_operation;
+ goto error;
+ }
+
+ switch (type) {
+ case 'g':
+ prec = (spec->prec == 0) ? 1 : spec->prec;
+ if (dec->digits > prec) {
+ _mpd_round(&tmp, dec, prec, ctx,
+ &workstatus);
+ dec = &tmp;
+ }
+ break;
+ case 'e':
+ if (mpd_iszero(dec)) {
+ dplace = 1-spec->prec;
+ }
+ else {
+ _mpd_round(&tmp, dec, spec->prec+1, ctx,
+ &workstatus);
+ dec = &tmp;
+ }
+ break;
+ case 'f':
+ mpd_qrescale(&tmp, dec, -spec->prec, ctx,
+ &workstatus);
+ dec = &tmp;
+ break;
+ }
+ }
+
+ if (type == 'f') {
+ if (mpd_iszero(dec) && dec->exp > 0) {
+ mpd_qrescale(&tmp, dec, 0, ctx, &workstatus);
+ dec = &tmp;
+ }
+ }
+
+ if (workstatus&MPD_Errors) {
+ *status |= (workstatus&MPD_Errors);
+ goto error;
+ }
+ }
+
+ /*
+ * At this point, for all scaled or non-scaled decimals:
+ * 1) 1 <= digits <= MAX_PREC+1
+ * 2) adjexp(scaled) = adjexp(orig) [+1]
+ * 3) case 'g': MIN_ETINY <= exp <= MAX_EMAX+1
+ * case 'e': MIN_ETINY-MAX_PREC <= exp <= MAX_EMAX+1
+ * case 'f': MIN_ETINY <= exp <= MAX_EMAX+1
+ * 4) max memory alloc in _mpd_to_string:
+ * case 'g': MAX_PREC+36
+ * case 'e': MAX_PREC+36
+ * case 'f': 2*MPD_MAX_PREC+30
+ */
+ result.nbytes = _mpd_to_string(&result.data, dec, flags, dplace);
+ result.nchars = result.nbytes;
+ if (result.nbytes < 0) {
+ *status |= MPD_Malloc_error;
+ goto error;
+ }
+
+ if (*spec->dot != '\0' && !mpd_isspecial(dec)) {
+ if (result.nchars > MPD_MAX_PREC+36) {
+ /* Since a group length of one is not explicitly
+ * disallowed, ensure that it is always possible to
+ * insert a four byte separator after each digit. */
+ *status |= MPD_Invalid_operation;
+ mpd_free(result.data);
+ goto error;
+ }
+ if (!_mpd_apply_lconv(&result, spec, status)) {
+ goto error;
+ }
+ }
+
+ if (spec->min_width) {
+ if (!_mpd_add_pad(&result, spec, status)) {
+ goto error;
+ }
+ }
+
+ mpd_del(&tmp);
+ return result.data;
+
+error:
+ mpd_del(&tmp);
+ return NULL;
+}
+
+char *
+mpd_qformat(const mpd_t *dec, const char *fmt, const mpd_context_t *ctx,
+ uint32_t *status)
+{
+ mpd_spec_t spec;
+
+ if (!mpd_parse_fmt_str(&spec, fmt, 1)) {
+ *status |= MPD_Invalid_operation;
+ return NULL;
+ }
+
+ return mpd_qformat_spec(dec, &spec, ctx, status);
+}
+
+/*
+ * The specification has a *condition* called Invalid_operation and an
+ * IEEE *signal* called Invalid_operation. The former corresponds to
+ * MPD_Invalid_operation, the latter to MPD_IEEE_Invalid_operation.
+ * MPD_IEEE_Invalid_operation comprises the following conditions:
+ *
+ * [MPD_Conversion_syntax, MPD_Division_impossible, MPD_Division_undefined,
+ * MPD_Fpu_error, MPD_Invalid_context, MPD_Invalid_operation,
+ * MPD_Malloc_error]
+ *
+ * In the following functions, 'flag' denotes the condition, 'signal'
+ * denotes the IEEE signal.
+ */
+
+static const char *mpd_flag_string[MPD_NUM_FLAGS] = {
+ "Clamped",
+ "Conversion_syntax",
+ "Division_by_zero",
+ "Division_impossible",
+ "Division_undefined",
+ "Fpu_error",
+ "Inexact",
+ "Invalid_context",
+ "Invalid_operation",
+ "Malloc_error",
+ "Not_implemented",
+ "Overflow",
+ "Rounded",
+ "Subnormal",
+ "Underflow",
+};
+
+static const char *mpd_signal_string[MPD_NUM_FLAGS] = {
+ "Clamped",
+ "IEEE_Invalid_operation",
+ "Division_by_zero",
+ "IEEE_Invalid_operation",
+ "IEEE_Invalid_operation",
+ "IEEE_Invalid_operation",
+ "Inexact",
+ "IEEE_Invalid_operation",
+ "IEEE_Invalid_operation",
+ "IEEE_Invalid_operation",
+ "Not_implemented",
+ "Overflow",
+ "Rounded",
+ "Subnormal",
+ "Underflow",
+};
+
+/* print conditions to buffer, separated by spaces */
+int
+mpd_snprint_flags(char *dest, int nmemb, uint32_t flags)
+{
+ char *cp;
+ int n, j;
+
+ assert(nmemb >= MPD_MAX_FLAG_STRING);
+
+ *dest = '\0'; cp = dest;
+ for (j = 0; j < MPD_NUM_FLAGS; j++) {
+ if (flags & (1U<<j)) {
+ n = snprintf(cp, nmemb, "%s ", mpd_flag_string[j]);
+ if (n < 0 || n >= nmemb) return -1;
+ cp += n; nmemb -= n;
+ }
+ }
+
+ if (cp != dest) {
+ *(--cp) = '\0';
+ }
+
+ return (int)(cp-dest);
+}
+
+/* print conditions to buffer, in list form */
+int
+mpd_lsnprint_flags(char *dest, int nmemb, uint32_t flags, const char *flag_string[])
+{
+ char *cp;
+ int n, j;
+
+ assert(nmemb >= MPD_MAX_FLAG_LIST);
+ if (flag_string == NULL) {
+ flag_string = mpd_flag_string;
+ }
+
+ *dest = '[';
+ *(dest+1) = '\0';
+ cp = dest+1;
+ --nmemb;
+
+ for (j = 0; j < MPD_NUM_FLAGS; j++) {
+ if (flags & (1U<<j)) {
+ n = snprintf(cp, nmemb, "%s, ", flag_string[j]);
+ if (n < 0 || n >= nmemb) return -1;
+ cp += n; nmemb -= n;
+ }
+ }
+
+ /* erase the last ", " */
+ if (cp != dest+1) {
+ cp -= 2;
+ }
+
+ *cp++ = ']';
+ *cp = '\0';
+
+ return (int)(cp-dest); /* strlen, without NUL terminator */
+}
+
+/* print signals to buffer, in list form */
+int
+mpd_lsnprint_signals(char *dest, int nmemb, uint32_t flags, const char *signal_string[])
+{
+ char *cp;
+ int n, j;
+ int ieee_invalid_done = 0;
+
+ assert(nmemb >= MPD_MAX_SIGNAL_LIST);
+ if (signal_string == NULL) {
+ signal_string = mpd_signal_string;
+ }
+
+ *dest = '[';
+ *(dest+1) = '\0';
+ cp = dest+1;
+ --nmemb;
+
+ for (j = 0; j < MPD_NUM_FLAGS; j++) {
+ uint32_t f = flags & (1U<<j);
+ if (f) {
+ if (f&MPD_IEEE_Invalid_operation) {
+ if (ieee_invalid_done) {
+ continue;
+ }
+ ieee_invalid_done = 1;
+ }
+ n = snprintf(cp, nmemb, "%s, ", signal_string[j]);
+ if (n < 0 || n >= nmemb) return -1;
+ cp += n; nmemb -= n;
+ }
+ }
+
+ /* erase the last ", " */
+ if (cp != dest+1) {
+ cp -= 2;
+ }
+
+ *cp++ = ']';
+ *cp = '\0';
+
+ return (int)(cp-dest); /* strlen, without NUL terminator */
+}
+
+/* The following two functions are mainly intended for debugging. */
+void
+mpd_fprint(FILE *file, const mpd_t *dec)
+{
+ char *decstring;
+
+ decstring = mpd_to_sci(dec, 1);
+ if (decstring != NULL) {
+ fprintf(file, "%s\n", decstring);
+ mpd_free(decstring);
+ }
+ else {
+ fputs("mpd_fprint: output error\n", file); /* GCOV_NOT_REACHED */
+ }
+}
+
+void
+mpd_print(const mpd_t *dec)
+{
+ char *decstring;
+
+ decstring = mpd_to_sci(dec, 1);
+ if (decstring != NULL) {
+ printf("%s\n", decstring);
+ mpd_free(decstring);
+ }
+ else {
+ fputs("mpd_fprint: output error\n", stderr); /* GCOV_NOT_REACHED */
+ }
+}
+
+
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