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-rw-r--r--lib/libc/stdio/vfwscanf.c1010
1 files changed, 1010 insertions, 0 deletions
diff --git a/lib/libc/stdio/vfwscanf.c b/lib/libc/stdio/vfwscanf.c
new file mode 100644
index 000000000000..7ca64eb37811
--- /dev/null
+++ b/lib/libc/stdio/vfwscanf.c
@@ -0,0 +1,1010 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1990, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Copyright (c) 2011 The FreeBSD Foundation
+ *
+ * Copyright (c) 2023 Dag-Erling Smørgrav
+ *
+ * Portions of this software were developed by David Chisnall
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include "namespace.h"
+#include <ctype.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <string.h>
+#include <wchar.h>
+#include <wctype.h>
+#include "un-namespace.h"
+
+#include "libc_private.h"
+#include "local.h"
+#include "xlocale_private.h"
+
+#define BUF 513 /* Maximum length of numeric string. */
+
+/*
+ * Flags used during conversion.
+ */
+#define LONG 0x01 /* l: long or double */
+#define LONGDBL 0x02 /* L: long double */
+#define SHORT 0x04 /* h: short */
+#define SUPPRESS 0x08 /* *: suppress assignment */
+#define POINTER 0x10 /* p: void * (as hex) */
+#define NOSKIP 0x20 /* [ or c: do not skip blanks */
+#define FASTINT 0x200 /* wfN: int_fastN_t */
+#define LONGLONG 0x400 /* ll: long long (+ deprecated q: quad) */
+#define INTMAXT 0x800 /* j: intmax_t */
+#define PTRDIFFT 0x1000 /* t: ptrdiff_t */
+#define SIZET 0x2000 /* z: size_t */
+#define SHORTSHORT 0x4000 /* hh: char */
+#define UNSIGNED 0x8000 /* %[oupxX] conversions */
+
+/*
+ * Conversion types.
+ */
+#define CT_CHAR 0 /* %c conversion */
+#define CT_CCL 1 /* %[...] conversion */
+#define CT_STRING 2 /* %s conversion */
+#define CT_INT 3 /* %[dioupxX] conversion */
+#define CT_FLOAT 4 /* %[efgEFG] conversion */
+
+#ifndef NO_FLOATING_POINT
+static int parsefloat(FILE *, wchar_t *, wchar_t *, locale_t);
+#endif
+
+struct ccl {
+ const wchar_t *start; /* character class start */
+ const wchar_t *end; /* character class end */
+ int compl; /* ccl is complemented? */
+};
+
+static __inline int
+inccl(const struct ccl *ccl, wint_t wi)
+{
+
+ if (ccl->compl) {
+ return (wmemchr(ccl->start, wi, ccl->end - ccl->start)
+ == NULL);
+ } else {
+ return (wmemchr(ccl->start, wi, ccl->end - ccl->start) != NULL);
+ }
+}
+
+/*
+ * Conversion functions are passed a pointer to this object instead of
+ * a real parameter to indicate that the assignment-suppression (*)
+ * flag was specified. We could use a NULL pointer to indicate this,
+ * but that would mask bugs in applications that call scanf() with a
+ * NULL pointer.
+ */
+static const int suppress;
+#define SUPPRESS_PTR ((void *)&suppress)
+
+static const mbstate_t initial_mbs;
+
+/*
+ * The following conversion functions return the number of characters consumed,
+ * or -1 on input failure. Character class conversion returns 0 on match
+ * failure.
+ */
+
+static __inline int
+convert_char(FILE *fp, char * mbp, int width, locale_t locale)
+{
+ mbstate_t mbs;
+ size_t nconv;
+ wint_t wi;
+ int n;
+
+ n = 0;
+ mbs = initial_mbs;
+ while (width-- != 0 && (wi = __fgetwc(fp, locale)) != WEOF) {
+ if (mbp != SUPPRESS_PTR) {
+ nconv = wcrtomb(mbp, wi, &mbs);
+ if (nconv == (size_t)-1)
+ return (-1);
+ mbp += nconv;
+ }
+ n++;
+ }
+ if (n == 0)
+ return (-1);
+ return (n);
+}
+
+static __inline int
+convert_wchar(FILE *fp, wchar_t *wcp, int width, locale_t locale)
+{
+ wint_t wi;
+ int n;
+
+ n = 0;
+ while (width-- != 0 && (wi = __fgetwc(fp, locale)) != WEOF) {
+ if (wcp != SUPPRESS_PTR)
+ *wcp++ = (wchar_t)wi;
+ n++;
+ }
+ if (n == 0)
+ return (-1);
+ return (n);
+}
+
+static __inline int
+convert_ccl(FILE *fp, char * mbp, int width, const struct ccl *ccl,
+ locale_t locale)
+{
+ mbstate_t mbs;
+ size_t nconv;
+ wint_t wi;
+ int n;
+
+ n = 0;
+ mbs = initial_mbs;
+ while ((wi = __fgetwc(fp, locale)) != WEOF &&
+ width-- != 0 && inccl(ccl, wi)) {
+ if (mbp != SUPPRESS_PTR) {
+ nconv = wcrtomb(mbp, wi, &mbs);
+ if (nconv == (size_t)-1)
+ return (-1);
+ mbp += nconv;
+ }
+ n++;
+ }
+ if (wi != WEOF)
+ __ungetwc(wi, fp, locale);
+ if (mbp != SUPPRESS_PTR)
+ *mbp = 0;
+ return (n);
+}
+
+static __inline int
+convert_wccl(FILE *fp, wchar_t *wcp, int width, const struct ccl *ccl,
+ locale_t locale)
+{
+ wchar_t *wcp0;
+ wint_t wi;
+ int n;
+
+ if (wcp == SUPPRESS_PTR) {
+ n = 0;
+ while ((wi = __fgetwc(fp, locale)) != WEOF &&
+ width-- != 0 && inccl(ccl, wi))
+ n++;
+ if (wi != WEOF)
+ __ungetwc(wi, fp, locale);
+ } else {
+ wcp0 = wcp;
+ while ((wi = __fgetwc(fp, locale)) != WEOF &&
+ width-- != 0 && inccl(ccl, wi))
+ *wcp++ = (wchar_t)wi;
+ if (wi != WEOF)
+ __ungetwc(wi, fp, locale);
+ n = wcp - wcp0;
+ if (n == 0)
+ return (0);
+ *wcp = 0;
+ }
+ return (n);
+}
+
+static __inline int
+convert_string(FILE *fp, char * mbp, int width, locale_t locale)
+{
+ mbstate_t mbs;
+ size_t nconv;
+ wint_t wi;
+ int nread;
+
+ mbs = initial_mbs;
+ nread = 0;
+ while ((wi = __fgetwc(fp, locale)) != WEOF && width-- != 0 &&
+ !iswspace(wi)) {
+ if (mbp != SUPPRESS_PTR) {
+ nconv = wcrtomb(mbp, wi, &mbs);
+ if (nconv == (size_t)-1)
+ return (-1);
+ mbp += nconv;
+ }
+ nread++;
+ }
+ if (wi != WEOF)
+ __ungetwc(wi, fp, locale);
+ if (mbp != SUPPRESS_PTR)
+ *mbp = 0;
+ return (nread);
+}
+
+static __inline int
+convert_wstring(FILE *fp, wchar_t *wcp, int width, locale_t locale)
+{
+ wint_t wi;
+ int nread;
+
+ nread = 0;
+ if (wcp == SUPPRESS_PTR) {
+ while ((wi = __fgetwc(fp, locale)) != WEOF &&
+ width-- != 0 && !iswspace(wi))
+ nread++;
+ if (wi != WEOF)
+ __ungetwc(wi, fp, locale);
+ } else {
+ while ((wi = __fgetwc(fp, locale)) != WEOF &&
+ width-- != 0 && !iswspace(wi)) {
+ *wcp++ = (wchar_t)wi;
+ nread++;
+ }
+ if (wi != WEOF)
+ __ungetwc(wi, fp, locale);
+ *wcp = '\0';
+ }
+ return (nread);
+}
+
+enum parseint_state {
+ begin,
+ havesign,
+ havezero,
+ haveprefix,
+ any,
+};
+
+static __inline int
+parseint_fsm(wchar_t c, enum parseint_state *state, int *base)
+{
+ switch (c) {
+ case '+':
+ case '-':
+ if (*state == begin) {
+ *state = havesign;
+ return 1;
+ }
+ break;
+ case '0':
+ if (*state == begin || *state == havesign) {
+ *state = havezero;
+ return 1;
+ }
+ /* FALL THROUGH */
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ if (*state == havezero && *base == 0) {
+ *base = 8;
+ }
+ /* FALL THROUGH */
+ case '8':
+ case '9':
+ if (*state == begin ||
+ *state == havesign) {
+ if (*base == 0) {
+ *base = 10;
+ }
+ }
+ if (*state == begin ||
+ *state == havesign ||
+ *state == havezero ||
+ *state == haveprefix ||
+ *state == any) {
+ if (*base > c - '0') {
+ *state = any;
+ return 1;
+ }
+ }
+ break;
+ case 'b':
+ if (*state == havezero) {
+ if (*base == 0 || *base == 2) {
+ *state = haveprefix;
+ *base = 2;
+ return 1;
+ }
+ }
+ /* FALL THROUGH */
+ case 'a':
+ case 'c':
+ case 'd':
+ case 'e':
+ case 'f':
+ if (*state == begin ||
+ *state == havesign ||
+ *state == havezero ||
+ *state == haveprefix ||
+ *state == any) {
+ if (*base > c - 'a' + 10) {
+ *state = any;
+ return 1;
+ }
+ }
+ break;
+ case 'B':
+ if (*state == havezero) {
+ if (*base == 0 || *base == 2) {
+ *state = haveprefix;
+ *base = 2;
+ return 1;
+ }
+ }
+ /* FALL THROUGH */
+ case 'A':
+ case 'C':
+ case 'D':
+ case 'E':
+ case 'F':
+ if (*state == begin ||
+ *state == havesign ||
+ *state == havezero ||
+ *state == haveprefix ||
+ *state == any) {
+ if (*base > c - 'A' + 10) {
+ *state = any;
+ return 1;
+ }
+ }
+ break;
+ case 'x':
+ case 'X':
+ if (*state == havezero) {
+ if (*base == 0 || *base == 16) {
+ *state = haveprefix;
+ *base = 16;
+ return 1;
+ }
+ }
+ break;
+ }
+ return 0;
+}
+
+/*
+ * Read an integer, storing it in buf.
+ *
+ * Return 0 on a match failure, and the number of characters read
+ * otherwise.
+ */
+static __inline int
+parseint(FILE *fp, wchar_t * __restrict buf, int width, int base,
+ locale_t locale)
+{
+ enum parseint_state state = begin;
+ wchar_t *wcp;
+ int c;
+
+ for (wcp = buf; width; width--) {
+ c = __fgetwc(fp, locale);
+ if (c == WEOF)
+ break;
+ if (!parseint_fsm(c, &state, &base))
+ break;
+ *wcp++ = (wchar_t)c;
+ }
+ /*
+ * If we only had a sign, push it back. If we only had a 0b or 0x
+ * prefix (possibly preceded by a sign), we view it as "0" and
+ * push back the letter. In all other cases, if we stopped
+ * because we read a non-number character, push it back.
+ */
+ if (state == havesign) {
+ wcp--;
+ __ungetwc(*wcp, fp, locale);
+ } else if (state == haveprefix) {
+ wcp--;
+ __ungetwc(c, fp, locale);
+ } else if (width && c != WEOF) {
+ __ungetwc(c, fp, locale);
+ }
+ return (wcp - buf);
+}
+
+/*
+ * MT-safe version.
+ */
+int
+vfwscanf_l(FILE * __restrict fp, locale_t locale,
+ const wchar_t * __restrict fmt, va_list ap)
+{
+ int ret;
+ FIX_LOCALE(locale);
+
+ FLOCKFILE_CANCELSAFE(fp);
+ ORIENT(fp, 1);
+ ret = __vfwscanf(fp, locale, fmt, ap);
+ FUNLOCKFILE_CANCELSAFE();
+ return (ret);
+}
+int
+vfwscanf(FILE * __restrict fp, const wchar_t * __restrict fmt, va_list ap)
+{
+ return vfwscanf_l(fp, __get_locale(), fmt, ap);
+}
+
+/*
+ * Non-MT-safe version.
+ */
+int
+__vfwscanf(FILE * __restrict fp, locale_t locale,
+ const wchar_t * __restrict fmt, va_list ap)
+{
+#define GETARG(type) ((flags & SUPPRESS) ? SUPPRESS_PTR : va_arg(ap, type))
+ wint_t c; /* character from format, or conversion */
+ size_t width; /* field width, or 0 */
+ int flags; /* flags as defined above */
+ int nassigned; /* number of fields assigned */
+ int nconversions; /* number of conversions */
+ int nr; /* characters read by the current conversion */
+ int nread; /* number of characters consumed from fp */
+ int base; /* base argument to conversion function */
+ struct ccl ccl; /* character class info */
+ wchar_t buf[BUF]; /* buffer for numeric conversions */
+ wint_t wi; /* handy wint_t */
+
+ nassigned = 0;
+ nconversions = 0;
+ nread = 0;
+ ccl.start = ccl.end = NULL;
+ for (;;) {
+ c = *fmt++;
+ if (c == 0)
+ return (nassigned);
+ if (iswspace(c)) {
+ while ((c = __fgetwc(fp, locale)) != WEOF &&
+ iswspace_l(c, locale))
+ nread++;
+ if (c != WEOF)
+ __ungetwc(c, fp, locale);
+ continue;
+ }
+ if (c != '%')
+ goto literal;
+ width = 0;
+ flags = 0;
+ /*
+ * switch on the format. continue if done;
+ * break once format type is derived.
+ */
+again: c = *fmt++;
+ switch (c) {
+ case '%':
+literal:
+ if ((wi = __fgetwc(fp, locale)) == WEOF)
+ goto input_failure;
+ if (wi != c) {
+ __ungetwc(wi, fp, locale);
+ goto match_failure;
+ }
+ nread++;
+ continue;
+
+ case '*':
+ flags |= SUPPRESS;
+ goto again;
+ case 'j':
+ flags |= INTMAXT;
+ goto again;
+ case 'l':
+ if (flags & LONG) {
+ flags &= ~LONG;
+ flags |= LONGLONG;
+ } else
+ flags |= LONG;
+ goto again;
+ case 'q':
+ flags |= LONGLONG; /* not quite */
+ goto again;
+ case 't':
+ flags |= PTRDIFFT;
+ goto again;
+ case 'w':
+ /*
+ * Fixed-width integer types. On all platforms we
+ * support, int8_t is equivalent to char, int16_t
+ * is equivalent to short, int32_t is equivalent
+ * to int, int64_t is equivalent to long long int.
+ * Furthermore, int_fast8_t, int_fast16_t and
+ * int_fast32_t are equivalent to int, and
+ * int_fast64_t is equivalent to long long int.
+ */
+ flags &= ~(SHORTSHORT|SHORT|LONG|LONGLONG|SIZET|INTMAXT|PTRDIFFT);
+ if (fmt[0] == 'f') {
+ flags |= FASTINT;
+ fmt++;
+ } else {
+ flags &= ~FASTINT;
+ }
+ if (fmt[0] == '8') {
+ if (!(flags & FASTINT))
+ flags |= SHORTSHORT;
+ else
+ /* no flag set = 32 */ ;
+ fmt += 1;
+ } else if (fmt[0] == '1' && fmt[1] == '6') {
+ if (!(flags & FASTINT))
+ flags |= SHORT;
+ else
+ /* no flag set = 32 */ ;
+ fmt += 2;
+ } else if (fmt[0] == '3' && fmt[1] == '2') {
+ /* no flag set = 32 */ ;
+ fmt += 2;
+ } else if (fmt[0] == '6' && fmt[1] == '4') {
+ flags |= LONGLONG;
+ fmt += 2;
+ } else {
+ goto match_failure;
+ }
+ goto again;
+ case 'z':
+ flags |= SIZET;
+ goto again;
+ case 'L':
+ flags |= LONGDBL;
+ goto again;
+ case 'h':
+ if (flags & SHORT) {
+ flags &= ~SHORT;
+ flags |= SHORTSHORT;
+ } else
+ flags |= SHORT;
+ goto again;
+
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ width = width * 10 + c - '0';
+ goto again;
+
+ /*
+ * Conversions.
+ */
+ case 'B':
+ case 'b':
+ c = CT_INT;
+ flags |= UNSIGNED;
+ base = 2;
+ break;
+
+ case 'd':
+ c = CT_INT;
+ base = 10;
+ break;
+
+ case 'i':
+ c = CT_INT;
+ base = 0;
+ break;
+
+ case 'o':
+ c = CT_INT;
+ flags |= UNSIGNED;
+ base = 8;
+ break;
+
+ case 'u':
+ c = CT_INT;
+ flags |= UNSIGNED;
+ base = 10;
+ break;
+
+ case 'X':
+ case 'x':
+ c = CT_INT;
+ flags |= UNSIGNED;
+ base = 16;
+ break;
+
+#ifndef NO_FLOATING_POINT
+ case 'A': case 'E': case 'F': case 'G':
+ case 'a': case 'e': case 'f': case 'g':
+ c = CT_FLOAT;
+ break;
+#endif
+
+ case 'S':
+ flags |= LONG;
+ /* FALLTHROUGH */
+ case 's':
+ c = CT_STRING;
+ break;
+
+ case '[':
+ ccl.start = fmt;
+ if (*fmt == '^') {
+ ccl.compl = 1;
+ fmt++;
+ } else
+ ccl.compl = 0;
+ if (*fmt == ']')
+ fmt++;
+ while (*fmt != '\0' && *fmt != ']')
+ fmt++;
+ ccl.end = fmt;
+ fmt++;
+ flags |= NOSKIP;
+ c = CT_CCL;
+ break;
+
+ case 'C':
+ flags |= LONG;
+ /* FALLTHROUGH */
+ case 'c':
+ flags |= NOSKIP;
+ c = CT_CHAR;
+ break;
+
+ case 'p': /* pointer format is like hex */
+ flags |= POINTER;
+ c = CT_INT; /* assumes sizeof(uintmax_t) */
+ flags |= UNSIGNED; /* >= sizeof(uintptr_t) */
+ base = 16;
+ break;
+
+ case 'n':
+ if (flags & SUPPRESS) /* ??? */
+ continue;
+ if (flags & SHORTSHORT)
+ *va_arg(ap, char *) = nread;
+ else if (flags & SHORT)
+ *va_arg(ap, short *) = nread;
+ else if (flags & LONG)
+ *va_arg(ap, long *) = nread;
+ else if (flags & LONGLONG)
+ *va_arg(ap, long long *) = nread;
+ else if (flags & INTMAXT)
+ *va_arg(ap, intmax_t *) = nread;
+ else if (flags & SIZET)
+ *va_arg(ap, size_t *) = nread;
+ else if (flags & PTRDIFFT)
+ *va_arg(ap, ptrdiff_t *) = nread;
+ else
+ *va_arg(ap, int *) = nread;
+ continue;
+
+ default:
+ goto match_failure;
+
+ /*
+ * Disgusting backwards compatibility hack. XXX
+ */
+ case '\0': /* compat */
+ return (EOF);
+ }
+
+ /*
+ * Consume leading white space, except for formats
+ * that suppress this.
+ */
+ if ((flags & NOSKIP) == 0) {
+ while ((wi = __fgetwc(fp, locale)) != WEOF && iswspace(wi))
+ nread++;
+ if (wi == WEOF)
+ goto input_failure;
+ __ungetwc(wi, fp, locale);
+ }
+
+ /*
+ * Do the conversion.
+ */
+ switch (c) {
+
+ case CT_CHAR:
+ /* scan arbitrary characters (sets NOSKIP) */
+ if (width == 0)
+ width = 1;
+ if (flags & LONG) {
+ nr = convert_wchar(fp, GETARG(wchar_t *), width,
+ locale);
+ } else {
+ nr = convert_char(fp, GETARG(char *), width,
+ locale);
+ }
+ if (nr < 0)
+ goto input_failure;
+ break;
+
+ case CT_CCL:
+ /* scan a (nonempty) character class (sets NOSKIP) */
+ if (width == 0)
+ width = (size_t)~0; /* `infinity' */
+ /* take only those things in the class */
+ if (flags & LONG) {
+ nr = convert_wccl(fp, GETARG(wchar_t *), width,
+ &ccl, locale);
+ } else {
+ nr = convert_ccl(fp, GETARG(char *), width,
+ &ccl, locale);
+ }
+ if (nr <= 0) {
+ if (nr < 0)
+ goto input_failure;
+ else /* nr == 0 */
+ goto match_failure;
+ }
+ break;
+
+ case CT_STRING:
+ /* like CCL, but zero-length string OK, & no NOSKIP */
+ if (width == 0)
+ width = (size_t)~0;
+ if (flags & LONG) {
+ nr = convert_wstring(fp, GETARG(wchar_t *),
+ width, locale);
+ } else {
+ nr = convert_string(fp, GETARG(char *), width,
+ locale);
+ }
+ if (nr < 0)
+ goto input_failure;
+ break;
+
+ case CT_INT:
+ /* scan an integer as if by the conversion function */
+ if (width == 0 || width > sizeof(buf) /
+ sizeof(*buf) - 1)
+ width = sizeof(buf) / sizeof(*buf) - 1;
+
+ nr = parseint(fp, buf, width, base, locale);
+ if (nr == 0)
+ goto match_failure;
+ if ((flags & SUPPRESS) == 0) {
+ uintmax_t res;
+
+ buf[nr] = L'\0';
+ if ((flags & UNSIGNED) == 0)
+ res = wcstoimax(buf, NULL, base);
+ else
+ res = wcstoumax(buf, NULL, base);
+ if (flags & POINTER)
+ *va_arg(ap, void **) =
+ (void *)(uintptr_t)res;
+ else if (flags & SHORTSHORT)
+ *va_arg(ap, char *) = res;
+ else if (flags & SHORT)
+ *va_arg(ap, short *) = res;
+ else if (flags & LONG)
+ *va_arg(ap, long *) = res;
+ else if (flags & LONGLONG)
+ *va_arg(ap, long long *) = res;
+ else if (flags & INTMAXT)
+ *va_arg(ap, intmax_t *) = res;
+ else if (flags & PTRDIFFT)
+ *va_arg(ap, ptrdiff_t *) = res;
+ else if (flags & SIZET)
+ *va_arg(ap, size_t *) = res;
+ else
+ *va_arg(ap, int *) = res;
+ }
+ break;
+
+#ifndef NO_FLOATING_POINT
+ case CT_FLOAT:
+ /* scan a floating point number as if by strtod */
+ if (width == 0 || width > sizeof(buf) /
+ sizeof(*buf) - 1)
+ width = sizeof(buf) / sizeof(*buf) - 1;
+ nr = parsefloat(fp, buf, buf + width, locale);
+ if (nr == 0)
+ goto match_failure;
+ if ((flags & SUPPRESS) == 0) {
+ if (flags & LONGDBL) {
+ long double res = wcstold(buf, NULL);
+ *va_arg(ap, long double *) = res;
+ } else if (flags & LONG) {
+ double res = wcstod(buf, NULL);
+ *va_arg(ap, double *) = res;
+ } else {
+ float res = wcstof(buf, NULL);
+ *va_arg(ap, float *) = res;
+ }
+ }
+ break;
+#endif /* !NO_FLOATING_POINT */
+ }
+ if (!(flags & SUPPRESS))
+ nassigned++;
+ nread += nr;
+ nconversions++;
+ }
+input_failure:
+ return (nconversions != 0 ? nassigned : EOF);
+match_failure:
+ return (nassigned);
+}
+
+#ifndef NO_FLOATING_POINT
+static int
+parsefloat(FILE *fp, wchar_t *buf, wchar_t *end, locale_t locale)
+{
+ mbstate_t mbs;
+ size_t nconv;
+ wchar_t *commit, *p;
+ int infnanpos = 0;
+ enum {
+ S_START, S_GOTSIGN, S_INF, S_NAN, S_DONE, S_MAYBEHEX,
+ S_DIGITS, S_FRAC, S_EXP, S_EXPDIGITS
+ } state = S_START;
+ wchar_t c;
+ wchar_t decpt;
+ _Bool gotmantdig = 0, ishex = 0;
+
+ mbs = initial_mbs;
+ nconv = mbrtowc(&decpt, localeconv()->decimal_point, MB_CUR_MAX, &mbs);
+ if (nconv == (size_t)-1 || nconv == (size_t)-2)
+ decpt = '.'; /* failsafe */
+
+ /*
+ * We set commit = p whenever the string we have read so far
+ * constitutes a valid representation of a floating point
+ * number by itself. At some point, the parse will complete
+ * or fail, and we will ungetc() back to the last commit point.
+ * To ensure that the file offset gets updated properly, it is
+ * always necessary to read at least one character that doesn't
+ * match; thus, we can't short-circuit "infinity" or "nan(...)".
+ */
+ commit = buf - 1;
+ c = WEOF;
+ for (p = buf; p < end; ) {
+ if ((c = __fgetwc(fp, locale)) == WEOF)
+ break;
+reswitch:
+ switch (state) {
+ case S_START:
+ state = S_GOTSIGN;
+ if (c == '-' || c == '+')
+ break;
+ else
+ goto reswitch;
+ case S_GOTSIGN:
+ switch (c) {
+ case '0':
+ state = S_MAYBEHEX;
+ commit = p;
+ break;
+ case 'I':
+ case 'i':
+ state = S_INF;
+ break;
+ case 'N':
+ case 'n':
+ state = S_NAN;
+ break;
+ default:
+ state = S_DIGITS;
+ goto reswitch;
+ }
+ break;
+ case S_INF:
+ if (infnanpos > 6 ||
+ (c != "nfinity"[infnanpos] &&
+ c != "NFINITY"[infnanpos]))
+ goto parsedone;
+ if (infnanpos == 1 || infnanpos == 6)
+ commit = p; /* inf or infinity */
+ infnanpos++;
+ break;
+ case S_NAN:
+ switch (infnanpos) {
+ case 0:
+ if (c != 'A' && c != 'a')
+ goto parsedone;
+ break;
+ case 1:
+ if (c != 'N' && c != 'n')
+ goto parsedone;
+ else
+ commit = p;
+ break;
+ case 2:
+ if (c != '(')
+ goto parsedone;
+ break;
+ default:
+ if (c == ')') {
+ commit = p;
+ state = S_DONE;
+ } else if (!iswalnum(c) && c != '_')
+ goto parsedone;
+ break;
+ }
+ infnanpos++;
+ break;
+ case S_DONE:
+ goto parsedone;
+ case S_MAYBEHEX:
+ state = S_DIGITS;
+ if (c == 'X' || c == 'x') {
+ ishex = 1;
+ break;
+ } else { /* we saw a '0', but no 'x' */
+ gotmantdig = 1;
+ goto reswitch;
+ }
+ case S_DIGITS:
+ if ((ishex && iswxdigit(c)) || iswdigit(c))
+ gotmantdig = 1;
+ else {
+ state = S_FRAC;
+ if (c != decpt)
+ goto reswitch;
+ }
+ if (gotmantdig)
+ commit = p;
+ break;
+ case S_FRAC:
+ if (((c == 'E' || c == 'e') && !ishex) ||
+ ((c == 'P' || c == 'p') && ishex)) {
+ if (!gotmantdig)
+ goto parsedone;
+ else
+ state = S_EXP;
+ } else if ((ishex && iswxdigit(c)) || iswdigit(c)) {
+ commit = p;
+ gotmantdig = 1;
+ } else
+ goto parsedone;
+ break;
+ case S_EXP:
+ state = S_EXPDIGITS;
+ if (c == '-' || c == '+')
+ break;
+ else
+ goto reswitch;
+ case S_EXPDIGITS:
+ if (iswdigit(c))
+ commit = p;
+ else
+ goto parsedone;
+ break;
+ default:
+ abort();
+ }
+ *p++ = c;
+ c = WEOF;
+ }
+
+parsedone:
+ if (c != WEOF)
+ __ungetwc(c, fp, locale);
+ while (commit < --p)
+ __ungetwc(*p, fp, locale);
+ *++commit = '\0';
+ return (commit - buf);
+}
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-05 21:58:24 +0000